ws connect works

1 files changed, 4817 insertions, 0 deletions

diff --git a/src/mongoose.c b/src/mongoose.c
new file mode 100644
index 0000000..0be9e23
--- /dev/null
+++ b/src/mongoose.c
@@ -0,0 +1,4817 @@
+// Copyright (c) 2004-2013 Sergey Lyubka
+// Copyright (c) 2013-2021 Cesanta Software Limited
+// All rights reserved
+//
+// This software is dual-licensed: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation. For the terms of this
+// license, see http://www.gnu.org/licenses/
+//
+// You are free to use this software under the terms of the GNU General
+// Public License, but WITHOUT ANY WARRANTY; without even the implied
+// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// Alternatively, you can license this software under a commercial
+// license, as set out in https://www.mongoose.ws/licensing/
+
+#include "mongoose.h"
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/base64.c"
+#endif
+
+#include <string.h>
+
+static int mg_b64idx(int c) {
+  if (c < 26) {
+    return c + 'A';
+  } else if (c < 52) {
+    return c - 26 + 'a';
+  } else if (c < 62) {
+    return c - 52 + '0';
+  } else {
+    return c == 62 ? '+' : '/';
+  }
+}
+
+static int mg_b64rev(int c) {
+  if (c >= 'A' && c <= 'Z') {
+    return c - 'A';
+  } else if (c >= 'a' && c <= 'z') {
+    return c + 26 - 'a';
+  } else if (c >= '0' && c <= '9') {
+    return c + 52 - '0';
+  } else if (c == '+') {
+    return 62;
+  } else if (c == '/') {
+    return 63;
+  } else if (c == '=') {
+    return 64;
+  } else {
+    return -1;
+  }
+}
+
+int mg_base64_update(unsigned char ch, char *to, int n) {
+  int rem = (n & 3) % 3;
+  if (rem == 0) {
+    to[n] = (char) mg_b64idx(ch >> 2);
+    to[++n] = (char) ((ch & 3) << 4);
+  } else if (rem == 1) {
+    to[n] = (char) mg_b64idx(to[n] | (ch >> 4));
+    to[++n] = (char) ((ch & 15) << 2);
+  } else {
+    to[n] = (char) mg_b64idx(to[n] | (ch >> 6));
+    to[++n] = (char) mg_b64idx(ch & 63);
+    n++;
+  }
+  return n;
+}
+
+int mg_base64_final(char *to, int n) {
+  int saved = n;
+  // printf("---[%.*s]\n", n, to);
+  if (n & 3) n = mg_base64_update(0, to, n);
+  if ((saved & 3) == 2) n--;
+  // printf("    %d[%.*s]\n", n, n, to);
+  while (n & 3) to[n++] = '=';
+  to[n] = '\0';
+  return n;
+}
+
+int mg_base64_encode(const unsigned char *p, int n, char *to) {
+  int i, len = 0;
+  for (i = 0; i < n; i++) len = mg_base64_update(p[i], to, len);
+  len = mg_base64_final(to, len);
+  return len;
+}
+
+int mg_base64_decode(const char *src, int n, char *dst) {
+  const char *end = src + n;
+  int len = 0;
+  while (src + 3 < end) {
+    int a = mg_b64rev(src[0]), b = mg_b64rev(src[1]), c = mg_b64rev(src[2]),
+        d = mg_b64rev(src[3]);
+    if (a == 64 || a < 0 || b == 64 || b < 0 || c < 0 || d < 0) return 0;
+    dst[len++] = (char) ((a << 2) | (b >> 4));
+    if (src[2] != '=') {
+      dst[len++] = (char) ((b << 4) | (c >> 2));
+      if (src[3] != '=') dst[len++] = (char) ((c << 6) | d);
+    }
+    src += 4;
+  }
+  dst[len] = '\0';
+  return len;
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/dns.c"
+#endif
+
+
+
+
+
+
+struct dns_data {
+  struct dns_data *next;
+  struct mg_connection *c;
+  unsigned long expire;
+  uint16_t txnid;
+};
+
+static struct dns_data *s_reqs;  // Active DNS requests
+
+static void mg_sendnsreq(struct mg_connection *, struct mg_str *, int,
+                         struct mg_dns *, bool);
+
+static void mg_dns_free(struct dns_data *d) {
+  LIST_DELETE(struct dns_data, &s_reqs, d);
+  free(d);
+}
+
+void mg_resolve_cancel(struct mg_connection *c) {
+  struct dns_data *tmp, *d;
+  for (d = s_reqs; d != NULL; d = tmp) {
+    tmp = d->next;
+    if (d->c == c) mg_dns_free(d);
+  }
+}
+
+static size_t mg_dns_parse_name_depth(const uint8_t *s, size_t len, size_t ofs,
+                                      char *to, size_t tolen, int depth) {
+  size_t i = 0, j = 0;
+  if (tolen > 0) to[0] = '\0';
+  if (depth > 5) return 0;
+  while (ofs + i + 1 < len) {
+    size_t n = s[ofs + i];
+    if (n == 0) {
+      i++;
+      break;
+    }
+    if (n & 0xc0) {
+      size_t ptr = (((n & 0x3f) << 8) | s[ofs + i + 1]);  // 12 is hdr len
+      if (ptr + 1 < len && (s[ptr] & 0xc0) == 0 &&
+          mg_dns_parse_name_depth(s, len, ptr, to, tolen, depth + 1) == 0)
+        return 0;
+      i += 2;
+      break;
+    }
+    if (ofs + i + n + 1 >= len) return 0;
+    if (j > 0) {
+      if (j < tolen) to[j] = '.';
+      j++;
+    }
+    if (j + n < tolen) memcpy(&to[j], &s[ofs + i + 1], n);
+    j += n;
+    i += n + 1;
+    if (j < tolen) to[j] = '\0';  // Zero-terminate this chunk
+  }
+  if (tolen > 0) to[tolen - 1] = '\0';  // Make sure make sure it is nul-term
+  return i;
+}
+
+static size_t mg_dns_parse_name(const uint8_t *s, size_t n, size_t ofs,
+                                char *dst, size_t dstlen) {
+  return mg_dns_parse_name_depth(s, n, ofs, dst, dstlen, 0);
+}
+
+size_t mg_dns_parse_rr(const uint8_t *buf, size_t len, size_t ofs,
+                       bool is_question, struct mg_dns_rr *rr) {
+  const uint8_t *s = buf + ofs, *e = &buf[len];
+
+  memset(rr, 0, sizeof(*rr));
+  if (len < sizeof(struct mg_dns_header)) return 0;  // Too small
+  if (len > 512) return 0;  //  Too large, we don't expect that
+  if (s >= e) return 0;     //  Overflow
+
+  if ((rr->nlen = (uint16_t) mg_dns_parse_name(buf, len, ofs, NULL, 0)) == 0)
+    return 0;
+  s += rr->nlen + 4;
+  if (s > e) return 0;
+  rr->atype = (uint16_t) (((uint16_t) s[-4] << 8) | s[-3]);
+  rr->aclass = (uint16_t) (((uint16_t) s[-2] << 8) | s[-1]);
+  if (is_question) return (size_t) (rr->nlen + 4);
+
+  s += 6;
+  if (s > e) return 0;
+  rr->alen = (uint16_t) (((uint16_t) s[-2] << 8) | s[-1]);
+  if (s + rr->alen > e) return 0;
+  return (size_t) (rr->nlen + rr->alen + 10);
+}
+
+bool mg_dns_parse(const uint8_t *buf, size_t len, struct mg_dns_message *dm) {
+  const struct mg_dns_header *h = (struct mg_dns_header *) buf;
+  struct mg_dns_rr rr;
+  size_t i, n, ofs = sizeof(*h);
+  memset(dm, 0, sizeof(*dm));
+
+  if (len < sizeof(*h)) return 0;                // Too small, headers dont fit
+  if (mg_ntohs(h->num_questions) > 1) return 0;  // Sanity
+  if (mg_ntohs(h->num_answers) > 10) return 0;   // Sanity
+  dm->txnid = mg_ntohs(h->txnid);
+
+  for (i = 0; i < mg_ntohs(h->num_questions); i++) {
+    if ((n = mg_dns_parse_rr(buf, len, ofs, true, &rr)) == 0) return false;
+    // LOG(LL_INFO, ("Q %zu %zu", ofs, n));
+    ofs += n;
+  }
+  for (i = 0; i < mg_ntohs(h->num_answers); i++) {
+    // LOG(LL_INFO, ("A -- %zu %zu %s", ofs, n, dm->name));
+    if ((n = mg_dns_parse_rr(buf, len, ofs, false, &rr)) == 0) return false;
+    mg_dns_parse_name(buf, len, ofs, dm->name, sizeof(dm->name));
+    ofs += n;
+
+    if (rr.alen == 4 && rr.atype == 1 && rr.aclass == 1) {
+      dm->addr.is_ip6 = false;
+      memcpy(&dm->addr.ip, &buf[ofs - 4], 4);
+      dm->resolved = true;
+      break;  // Return success
+    } else if (rr.alen == 16 && rr.atype == 28 && rr.aclass == 1) {
+      dm->addr.is_ip6 = true;
+      memcpy(&dm->addr.ip6, &buf[ofs - 16], 16);
+      dm->resolved = true;
+      break;  // Return success
+    }
+  }
+  return true;
+}
+
+static void dns_cb(struct mg_connection *c, int ev, void *ev_data,
+                   void *fn_data) {
+  struct dns_data *d, *tmp;
+  if (ev == MG_EV_POLL) {
+    unsigned long now = *(unsigned long *) ev_data;
+    for (d = s_reqs; d != NULL; d = tmp) {
+      tmp = d->next;
+      // LOG(LL_DEBUG, ("%lu %lu dns poll", d->expire, now));
+      if (now > d->expire) mg_error(d->c, "DNS timeout");
+    }
+  } else if (ev == MG_EV_READ) {
+    struct mg_dns_message dm;
+    int resolved = 0;
+    if (mg_dns_parse(c->recv.buf, c->recv.len, &dm) == false) {
+      char *s = mg_hexdump(c->recv.buf, c->recv.len);
+      LOG(LL_ERROR, ("Unexpected DNS response:\n%s\n", s));
+      free(s);
+    } else {
+      LOG(LL_VERBOSE_DEBUG, ("%s %d", dm.name, dm.resolved));
+      for (d = s_reqs; d != NULL; d = tmp) {
+        tmp = d->next;
+        // LOG(LL_INFO, ("d %p %hu %hu", d, d->txnid, dm.txnid));
+        if (dm.txnid != d->txnid) continue;
+        if (d->c->is_resolving) {
+          d->c->is_resolving = 0;
+          if (dm.resolved) {
+#if MG_ENABLE_LOG
+            char buf[100];
+#endif
+            dm.addr.port = d->c->peer.port;  // Save port
+            d->c->peer = dm.addr;            // Copy resolved address
+            LOG(LL_DEBUG, ("%lu %s resolved to %s", d->c->id, dm.name,
+                           mg_ntoa(&d->c->peer, buf, sizeof(buf))));
+            mg_connect_resolved(d->c);
+#if MG_ENABLE_IPV6
+          } else if (dm.addr.is_ip6 == false && dm.name[0] != '\0') {
+            struct mg_str x = mg_str(dm.name);
+            mg_sendnsreq(d->c, &x, c->mgr->dnstimeout, &c->mgr->dns6, true);
+#endif
+          } else {
+            mg_error(d->c, "%s DNS lookup failed", dm.name);
+          }
+        } else {
+          LOG(LL_ERROR, ("%lu already resolved", d->c->id));
+        }
+        mg_dns_free(d);
+        resolved = 1;
+      }
+    }
+    if (!resolved) LOG(LL_ERROR, ("stray DNS reply"));
+    c->recv.len = 0;
+  } else if (ev == MG_EV_CLOSE) {
+    for (d = s_reqs; d != NULL; d = tmp) {
+      tmp = d->next;
+      mg_dns_free(d);
+    }
+  }
+  (void) fn_data;
+}
+
+static void mg_dns_send(struct mg_connection *c, const struct mg_str *name,
+                        uint16_t txnid, bool ipv6) {
+  struct {
+    struct mg_dns_header header;
+    uint8_t data[256];
+  } pkt;
+  size_t i, n;
+  memset(&pkt, 0, sizeof(pkt));
+  pkt.header.txnid = mg_htons(txnid);
+  pkt.header.flags = mg_htons(0x100);
+  pkt.header.num_questions = mg_htons(1);
+  for (i = n = 0; i < sizeof(pkt.data) - 5; i++) {
+    if (name->ptr[i] == '.' || i >= name->len) {
+      pkt.data[n] = (uint8_t) (i - n);
+      memcpy(&pkt.data[n + 1], name->ptr + n, i - n);
+      n = i + 1;
+    }
+    if (i >= name->len) break;
+  }
+  memcpy(&pkt.data[n], "\x00\x00\x01\x00\x01", 5);  // A query
+  n += 5;
+  if (ipv6) pkt.data[n - 3] = 0x1c;  // AAAA query
+  // memcpy(&pkt.data[n], "\xc0\x0c\x00\x1c\x00\x01", 6);  // AAAA query
+  // n += 6;
+  mg_send(c, &pkt, sizeof(pkt.header) + n);
+#if 0
+  // Immediately after A query, send AAAA query. Whatever reply comes first,
+  // we'll use it. Note: we cannot send two queries in a single packet.
+  // https://stackoverflow.com/questions/4082081/requesting-a-and-aaaa-records-in-single-dns-query
+  pkt.data[n - 3] = 0x1c;  // AAAA query
+  mg_send(c, &pkt, sizeof(pkt.header) + n);
+#endif
+}
+
+static void mg_sendnsreq(struct mg_connection *c, struct mg_str *name, int ms,
+                         struct mg_dns *dnsc, bool ipv6) {
+  struct dns_data *d = NULL;
+  if (dnsc->url == NULL) {
+    mg_error(c, "DNS server URL is NULL. Call mg_mgr_init()");
+  } else if (dnsc->c == NULL) {
+    dnsc->c = mg_connect(c->mgr, dnsc->url, NULL, NULL);
+    if (dnsc->c != NULL) {
+      dnsc->c->pfn = dns_cb;
+      snprintf(dnsc->c->label, sizeof(dnsc->c->label), "%s", "DNS");
+      // dnsc->c->is_hexdumping = 1;
+    }
+  }
+  if (dnsc->c == NULL) {
+    mg_error(c, "resolver");
+  } else if ((d = (struct dns_data *) calloc(1, sizeof(*d))) == NULL) {
+    mg_error(c, "resolve OOM");
+  } else {
+#if MG_ENABLE_LOG
+    char buf[100];
+#endif
+    d->txnid = s_reqs ? (uint16_t) (s_reqs->txnid + 1) : 1;
+    d->next = s_reqs;
+    s_reqs = d;
+    d->expire = mg_millis() + (unsigned long) ms;
+    d->c = c;
+    c->is_resolving = 1;
+    LOG(LL_VERBOSE_DEBUG,
+        ("%lu resolving %.*s @ %s, txnid %hu", c->id, (int) name->len,
+         name->ptr, mg_ntoa(&dnsc->c->peer, buf, sizeof(buf)), d->txnid));
+    mg_dns_send(dnsc->c, name, d->txnid, ipv6);
+  }
+}
+
+void mg_resolve(struct mg_connection *c, struct mg_str *name, int ms) {
+  if (mg_aton(*name, &c->peer)) {
+    // name is an IP address, do not fire name resolution
+    mg_connect_resolved(c);
+  } else {
+    // name is not an IP, send DNS resolution request
+    mg_sendnsreq(c, name, ms, &c->mgr->dns4, false);
+  }
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/event.c"
+#endif
+
+
+
+
+
+void mg_call(struct mg_connection *c, int ev, void *ev_data) {
+  // Run user-defined handler first, in order to give it an ability
+  // to intercept processing (e.g. clean input buffer) before the
+  // protocol handler kicks in
+  if (c->fn != NULL) c->fn(c, ev, ev_data, c->fn_data);
+  if (c->pfn != NULL) c->pfn(c, ev, ev_data, c->pfn_data);
+}
+
+void mg_error(struct mg_connection *c, const char *fmt, ...) {
+  char mem[256], *buf = mem;
+  va_list ap;
+  va_start(ap, fmt);
+  mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  va_end(ap);
+  LOG(LL_ERROR, ("%lu %s", c->id, buf));
+  c->is_closing = 1;             // Set is_closing before sending MG_EV_CALL
+  mg_call(c, MG_EV_ERROR, buf);  // Let user handler to override it
+  if (buf != mem) free(buf);
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/fs_packed.c"
+#endif
+
+
+struct packed_file {
+  const char *data;
+  size_t size;
+  size_t pos;
+};
+
+const char *mg_unpack(const char *path, size_t *size, time_t *mtime);
+const char *mg_unlist(size_t no);
+#if MG_ENABLE_PACKED_FS
+#else
+const char *mg_unpack(const char *path, size_t *size, time_t *mtime) {
+  (void) path, (void) size, (void) mtime;
+  return NULL;
+}
+const char *mg_unlist(size_t no) {
+  (void) no;
+  return NULL;
+}
+#endif
+
+static int is_dir_prefix(const char *prefix, size_t n, const char *path) {
+  return n < strlen(path) && memcmp(prefix, path, n) == 0 && path[n] == '/';
+  //(n == 0 || path[n] == MG_DIRSEP);
+}
+
+static int packed_stat(const char *path, size_t *size, time_t *mtime) {
+  const char *p;
+  size_t i, n = strlen(path);
+  if (mg_unpack(path, size, mtime)) return MG_FS_READ;  // Regular file
+  // Scan all files. If `path` is a dir prefix for any of them, it's a dir
+  for (i = 0; (p = mg_unlist(i)) != NULL; i++) {
+    if (is_dir_prefix(path, n, p)) return MG_FS_DIR;
+  }
+  return 0;
+}
+
+static void packed_list(const char *dir, void (*fn)(const char *, void *),
+                        void *userdata) {
+  char buf[256], tmp[sizeof(buf)];
+  const char *path, *begin, *end;
+  size_t i, n = strlen(dir);
+  tmp[0] = '\0';  // Previously listed entry
+  for (i = 0; (path = mg_unlist(i)) != NULL; i++) {
+    if (!is_dir_prefix(dir, n, path)) continue;
+    begin = &path[n + 1];
+    end = strchr(begin, '/');
+    if (end == NULL) end = begin + strlen(begin);
+    snprintf(buf, sizeof(buf), "%.*s", (int) (end - begin), begin);
+    buf[sizeof(buf) - 1] = '\0';
+    // If this entry has been already listed, skip
+    // NOTE: we're assuming that file list is sorted alphabetically
+    if (strcmp(buf, tmp) == 0) continue;
+    fn(buf, userdata);  // Not yet listed, call user function
+    strcpy(tmp, buf);   // And save this entry as listed
+  }
+}
+
+static struct mg_fd *packed_open(const char *path, int flags) {
+  size_t size = 0;
+  const char *data = mg_unpack(path, &size, NULL);
+  struct packed_file *fp = NULL;
+  struct mg_fd *fd = NULL;
+  if (data == NULL) return NULL;
+  if (flags & MG_FS_WRITE) return NULL;
+  fp = (struct packed_file *) calloc(1, sizeof(*fp));
+  fd = (struct mg_fd *) calloc(1, sizeof(*fd));
+  fp->size = size;
+  fp->data = data;
+  fd->fd = fp;
+  fd->fs = &mg_fs_packed;
+  return fd;
+}
+
+static void packed_close(struct mg_fd *fd) {
+  if (fd) free(fd->fd), free(fd);
+}
+
+static size_t packed_read(void *fd, void *buf, size_t len) {
+  struct packed_file *fp = (struct packed_file *) fd;
+  if (fp->pos + len > fp->size) len = fp->size - fp->pos;
+  memcpy(buf, &fp->data[fp->pos], len);
+  fp->pos += len;
+  return len;
+}
+
+static size_t packed_write(void *fd, const void *buf, size_t len) {
+  (void) fd, (void) buf, (void) len;
+  return 0;
+}
+
+static size_t packed_seek(void *fd, size_t offset) {
+  struct packed_file *fp = (struct packed_file *) fd;
+  fp->pos = offset;
+  if (fp->pos > fp->size) fp->pos = fp->size;
+  return fp->pos;
+}
+
+struct mg_fs mg_fs_packed = {packed_stat,  packed_list, packed_open,
+                             packed_close, packed_read, packed_write,
+                             packed_seek};
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/fs_posix.c"
+#endif
+
+
+#if defined(FOPEN_MAX)
+static int p_stat(const char *path, size_t *size, time_t *mtime) {
+#ifdef _WIN32
+  struct _stati64 st;
+  wchar_t tmp[PATH_MAX];
+  MultiByteToWideChar(CP_UTF8, 0, path, -1, tmp, sizeof(tmp) / sizeof(tmp[0]));
+  if (_wstati64(tmp, &st) != 0) return 0;
+#else
+  struct stat st;
+  if (stat(path, &st) != 0) return 0;
+#endif
+  if (size) *size = (size_t) st.st_size;
+  if (mtime) *mtime = st.st_mtime;
+  return MG_FS_READ | MG_FS_WRITE | (S_ISDIR(st.st_mode) ? MG_FS_DIR : 0);
+}
+
+#ifdef _WIN32
+struct dirent {
+  char d_name[MAX_PATH];
+};
+
+typedef struct win32_dir {
+  HANDLE handle;
+  WIN32_FIND_DATAW info;
+  struct dirent result;
+} DIR;
+
+int gettimeofday(struct timeval *tv, void *tz) {
+  FILETIME ft;
+  unsigned __int64 tmpres = 0;
+
+  if (tv != NULL) {
+    GetSystemTimeAsFileTime(&ft);
+    tmpres |= ft.dwHighDateTime;
+    tmpres <<= 32;
+    tmpres |= ft.dwLowDateTime;
+    tmpres /= 10;  // convert into microseconds
+    tmpres -= (int64_t) 11644473600000000;
+    tv->tv_sec = (long) (tmpres / 1000000UL);
+    tv->tv_usec = (long) (tmpres % 1000000UL);
+  }
+  (void) tz;
+  return 0;
+}
+
+static int to_wchar(const char *path, wchar_t *wbuf, size_t wbuf_len) {
+  int ret;
+  char buf[MAX_PATH * 2], buf2[MAX_PATH * 2], *p;
+  strncpy(buf, path, sizeof(buf));
+  buf[sizeof(buf) - 1] = '\0';
+  // Trim trailing slashes. Leave backslash for paths like "X:\"
+  p = buf + strlen(buf) - 1;
+  while (p > buf && p[-1] != ':' && (p[0] == '\\' || p[0] == '/')) *p-- = '\0';
+  memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
+  ret = MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
+  // Convert back to Unicode. If doubly-converted string does not match the
+  // original, something is fishy, reject.
+  WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
+                      NULL, NULL);
+  if (strcmp(buf, buf2) != 0) {
+    wbuf[0] = L'\0';
+    ret = 0;
+  }
+  return ret;
+}
+
+DIR *opendir(const char *name) {
+  DIR *d = NULL;
+  wchar_t wpath[MAX_PATH];
+  DWORD attrs;
+
+  if (name == NULL) {
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  } else if ((d = (DIR *) calloc(1, sizeof(*d))) == NULL) {
+    SetLastError(ERROR_NOT_ENOUGH_MEMORY);
+  } else {
+    to_wchar(name, wpath, sizeof(wpath) / sizeof(wpath[0]));
+    attrs = GetFileAttributesW(wpath);
+    if (attrs != 0Xffffffff && (attrs & FILE_ATTRIBUTE_DIRECTORY)) {
+      (void) wcscat(wpath, L"\\*");
+      d->handle = FindFirstFileW(wpath, &d->info);
+      d->result.d_name[0] = '\0';
+    } else {
+      free(d);
+      d = NULL;
+    }
+  }
+  return d;
+}
+
+int closedir(DIR *d) {
+  int result = 0;
+  if (d != NULL) {
+    if (d->handle != INVALID_HANDLE_VALUE)
+      result = FindClose(d->handle) ? 0 : -1;
+    free(d);
+  } else {
+    result = -1;
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  }
+  return result;
+}
+
+struct dirent *readdir(DIR *d) {
+  struct dirent *result = NULL;
+  if (d != NULL) {
+    memset(&d->result, 0, sizeof(d->result));
+    if (d->handle != INVALID_HANDLE_VALUE) {
+      result = &d->result;
+      WideCharToMultiByte(CP_UTF8, 0, d->info.cFileName, -1, result->d_name,
+                          sizeof(result->d_name), NULL, NULL);
+      if (!FindNextFileW(d->handle, &d->info)) {
+        FindClose(d->handle);
+        d->handle = INVALID_HANDLE_VALUE;
+      }
+    } else {
+      SetLastError(ERROR_FILE_NOT_FOUND);
+    }
+  } else {
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  }
+  return result;
+}
+#endif
+
+static void p_list(const char *dir, void (*fn)(const char *, void *),
+                   void *userdata) {
+#if MG_ENABLE_DIRLIST
+  struct dirent *dp;
+  DIR *dirp;
+  if ((dirp = (opendir(dir))) == NULL) return;
+  while ((dp = readdir(dirp)) != NULL) {
+    if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) continue;
+    fn(dp->d_name, userdata);
+  }
+  closedir(dirp);
+#else
+  (void) dir, (void) fn, (void) userdata;
+#endif
+}
+
+static struct mg_fd *p_open(const char *path, int flags) {
+  const char *mode = flags == (MG_FS_READ | MG_FS_WRITE) ? "r+b"
+                     : flags & MG_FS_READ                ? "rb"
+                     : flags & MG_FS_WRITE               ? "wb"
+                                                         : "";
+  void *fp = NULL;
+  struct mg_fd *fd = NULL;
+#ifdef _WIN32
+  wchar_t b1[PATH_MAX], b2[10];
+  MultiByteToWideChar(CP_UTF8, 0, path, -1, b1, sizeof(b1) / sizeof(b1[0]));
+  MultiByteToWideChar(CP_UTF8, 0, mode, -1, b2, sizeof(b2) / sizeof(b2[0]));
+  fp = (void *) _wfopen(b1, b2);
+#else
+  fp = (void *) fopen(path, mode);
+#endif
+  if (fp == NULL) return NULL;
+  fd = (struct mg_fd *) calloc(1, sizeof(*fd));
+  fd->fd = fp;
+  fd->fs = &mg_fs_posix;
+  return fd;
+}
+
+static void p_close(struct mg_fd *fd) {
+  if (fd != NULL) fclose((FILE *) fd->fd), free(fd);
+}
+
+static size_t p_read(void *fp, void *buf, size_t len) {
+  return fread(buf, 1, len, (FILE *) fp);
+}
+
+static size_t p_write(void *fp, const void *buf, size_t len) {
+  return fwrite(buf, 1, len, (FILE *) fp);
+}
+
+static size_t p_seek(void *fp, size_t offset) {
+#if (defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64) || \
+  (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L) || \
+  (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600)
+  fseeko((FILE *) fp, (off_t) offset, SEEK_SET);
+#else
+  fseek((FILE *) fp, (long) offset, SEEK_SET);
+#endif
+  return (size_t) ftell((FILE *) fp);
+}
+#else
+static char *p_realpath(const char *path, char *resolved_path) {
+  (void) path, (void) resolved_path;
+  return NULL;
+}
+
+static int p_stat(const char *path, size_t *size, time_t *mtime) {
+  (void) path, (void) size, (void) mtime;
+  return 0;
+}
+
+static void p_list(const char *path, void (*fn)(const char *, void *),
+                   void *userdata) {
+  (void) path, (void) fn, (void) userdata;
+}
+
+static struct mg_fd *p_open(const char *path, int flags) {
+  (void) path, (void) flags;
+  return NULL;
+}
+
+static void p_close(struct mg_fd *fd) {
+  (void) fd;
+}
+
+static size_t p_read(void *fd, void *buf, size_t len) {
+  (void) fd, (void) buf, (void) len;
+  return 0;
+}
+
+static size_t p_write(void *fd, const void *buf, size_t len) {
+  (void) fd, (void) buf, (void) len;
+  return 0;
+}
+
+static size_t p_seek(void *fd, size_t offset) {
+  (void) fd, (void) offset;
+  return (size_t) ~0;
+}
+#endif
+
+struct mg_fs mg_fs_posix = {p_stat, p_list,  p_open, p_close,
+                            p_read, p_write, p_seek};
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/http.c"
+#endif
+
+
+
+
+
+
+
+
+
+
+// Multipart POST example:
+// --xyz
+// Content-Disposition: form-data; name="val"
+//
+// abcdef
+// --xyz
+// Content-Disposition: form-data; name="foo"; filename="a.txt"
+// Content-Type: text/plain
+//
+// hello world
+//
+// --xyz--
+size_t mg_http_next_multipart(struct mg_str body, size_t ofs,
+                              struct mg_http_part *part) {
+  struct mg_str cd = mg_str_n("Content-Disposition", 19);
+  const char *s = body.ptr;
+  size_t b = ofs, h1, h2, b1, b2, max = body.len;
+
+  // Init part params
+  if (part != NULL) part->name = part->filename = part->body = mg_str_n(0, 0);
+
+  // Skip boundary
+  while (b + 2 < max && s[b] != '\r' && s[b + 1] != '\n') b++;
+  if (b <= ofs || b + 2 >= max) return 0;
+  // LOG(LL_INFO, ("B: %zu %zu [%.*s]", ofs, b - ofs, (int) (b - ofs), s));
+
+  // Skip headers
+  h1 = h2 = b + 2;
+  for (;;) {
+    while (h2 + 2 < max && s[h2] != '\r' && s[h2 + 1] != '\n') h2++;
+    if (h2 == h1) break;
+    if (h2 + 2 >= max) return 0;
+    // LOG(LL_INFO, ("Header: [%.*s]", (int) (h2 - h1), &s[h1]));
+    if (part != NULL && h1 + cd.len + 2 < h2 && s[h1 + cd.len] == ':' &&
+        mg_ncasecmp(&s[h1], cd.ptr, cd.len) == 0) {
+      struct mg_str v = mg_str_n(&s[h1 + cd.len + 2], h2 - (h1 + cd.len + 2));
+      part->name = mg_http_get_header_var(v, mg_str_n("name", 4));
+      part->filename = mg_http_get_header_var(v, mg_str_n("filename", 8));
+    }
+    h1 = h2 = h2 + 2;
+  }
+  b1 = b2 = h2 + 2;
+  while (b2 + 2 + (b - ofs) + 2 < max && !(s[b2] == '\r' && s[b2 + 1] == '\n' &&
+                                           memcmp(&s[b2 + 2], s, b - ofs) == 0))
+    b2++;
+
+  if (b2 + 2 >= max) return 0;
+  if (part != NULL) part->body = mg_str_n(&s[b1], b2 - b1);
+  // LOG(LL_INFO, ("Body: [%.*s]", (int) (b2 - b1), &s[b1]));
+  return b2 + 2;
+}
+
+void mg_http_bauth(struct mg_connection *c, const char *user,
+                   const char *pass) {
+  struct mg_str u = mg_str(user), p = mg_str(pass);
+  size_t need = c->send.len + 36 + (u.len + p.len) * 2;
+  if (c->send.size < need) mg_iobuf_resize(&c->send, need);
+  if (c->send.size >= need) {
+    int i, n = 0;
+    char *buf = (char *) &c->send.buf[c->send.len + 21];
+    memcpy(&buf[-21], "Authorization: Basic ", 21);  // DON'T use mg_send!
+    for (i = 0; i < (int) u.len; i++) {
+      n = mg_base64_update(((unsigned char *) u.ptr)[i], buf, n);
+    }
+    if (p.len > 0) {
+      n = mg_base64_update(':', buf, n);
+      for (i = 0; i < (int) p.len; i++) {
+        n = mg_base64_update(((unsigned char *) p.ptr)[i], buf, n);
+      }
+    }
+    n = mg_base64_final(buf, n);
+    c->send.len += 21 + (size_t) n + 2;
+    memcpy(&c->send.buf[c->send.len - 2], "\r\n", 2);
+  } else {
+    LOG(LL_ERROR, ("%lu %s cannot resize iobuf %d->%d ", c->id, c->label,
+                   (int) c->send.size, (int) need));
+  }
+}
+
+int mg_http_get_var(const struct mg_str *buf, const char *name, char *dst,
+                    size_t dst_len) {
+  const char *p, *e, *s;
+  size_t name_len;
+  int len;
+
+  if (dst == NULL || dst_len == 0) {
+    len = -2;  // Bad destination
+  } else if (buf->ptr == NULL || name == NULL || buf->len == 0) {
+    len = -1;  // Bad source
+    dst[0] = '\0';
+  } else {
+    name_len = strlen(name);
+    e = buf->ptr + buf->len;
+    len = -4;  // Name does not exist
+    dst[0] = '\0';
+    for (p = buf->ptr; p + name_len < e; p++) {
+      if ((p == buf->ptr || p[-1] == '&') && p[name_len] == '=' &&
+          !mg_ncasecmp(name, p, name_len)) {
+        p += name_len + 1;
+        s = (const char *) memchr(p, '&', (size_t) (e - p));
+        if (s == NULL) s = e;
+        len = mg_url_decode(p, (size_t) (s - p), dst, dst_len, 1);
+        if (len < 0) len = -3;  // Failed to decode
+        break;
+      }
+    }
+  }
+  return len;
+}
+
+int mg_url_decode(const char *src, size_t src_len, char *dst, size_t dst_len,
+                  int is_form_url_encoded) {
+  size_t i, j;
+  for (i = j = 0; i < src_len && j + 1 < dst_len; i++, j++) {
+    if (src[i] == '%') {
+      // Use `i + 2 < src_len`, not `i < src_len - 2`, note small src_len
+      if (i + 2 < src_len && isxdigit(*(const unsigned char *) (src + i + 1)) &&
+          isxdigit(*(const unsigned char *) (src + i + 2))) {
+        mg_unhex(src + i + 1, 2, (uint8_t *) &dst[j]);
+        i += 2;
+      } else {
+        return -1;
+      }
+    } else if (is_form_url_encoded && src[i] == '+') {
+      dst[j] = ' ';
+    } else {
+      dst[j] = src[i];
+    }
+  }
+  if (j < dst_len) dst[j] = '\0';  // Null-terminate the destination
+  return i >= src_len && j < dst_len ? (int) j : -1;
+}
+
+int mg_http_get_request_len(const unsigned char *buf, size_t buf_len) {
+  size_t i;
+  for (i = 0; i < buf_len; i++) {
+    if (!isprint(buf[i]) && buf[i] != '\r' && buf[i] != '\n' && buf[i] < 128)
+      return -1;
+    if ((i > 0 && buf[i] == '\n' && buf[i - 1] == '\n') ||
+        (i > 3 && buf[i] == '\n' && buf[i - 1] == '\r' && buf[i - 2] == '\n'))
+      return (int) i + 1;
+  }
+  return 0;
+}
+
+static const char *skip(const char *s, const char *e, const char *d,
+                        struct mg_str *v) {
+  v->ptr = s;
+  while (s < e && *s != '\n' && strchr(d, *s) == NULL) s++;
+  v->len = (size_t) (s - v->ptr);
+  while (s < e && strchr(d, *s) != NULL) s++;
+  return s;
+}
+
+struct mg_str *mg_http_get_header(struct mg_http_message *h, const char *name) {
+  size_t i, n = strlen(name), max = sizeof(h->headers) / sizeof(h->headers[0]);
+  for (i = 0; i < max && h->headers[i].name.len > 0; i++) {
+    struct mg_str *k = &h->headers[i].name, *v = &h->headers[i].value;
+    if (n == k->len && mg_ncasecmp(k->ptr, name, n) == 0) return v;
+  }
+  return NULL;
+}
+
+static void mg_http_parse_headers(const char *s, const char *end,
+                                  struct mg_http_header *h, int max_headers) {
+  int i;
+  for (i = 0; i < max_headers; i++) {
+    struct mg_str k, v, tmp;
+    const char *he = skip(s, end, "\n", &tmp);
+    s = skip(s, he, ": \r\n", &k);
+    s = skip(s, he, "\r\n", &v);
+    if (k.len == tmp.len) continue;
+    while (v.len > 0 && v.ptr[v.len - 1] == ' ') v.len--;  // Trim spaces
+    if (k.len == 0) break;
+    // LOG(LL_INFO, ("--HH [%.*s] [%.*s] [%.*s]", (int) tmp.len - 1, tmp.ptr,
+    //(int) k.len, k.ptr, (int) v.len, v.ptr));
+    h[i].name = k;
+    h[i].value = v;
+  }
+}
+
+int mg_http_parse(const char *s, size_t len, struct mg_http_message *hm) {
+  int is_response, req_len = mg_http_get_request_len((unsigned char *) s, len);
+  const char *end = s + req_len, *qs;
+  struct mg_str *cl;
+
+  memset(hm, 0, sizeof(*hm));
+  if (req_len <= 0) return req_len;
+
+  hm->message.ptr = hm->head.ptr = s;
+  hm->body.ptr = end;
+  hm->head.len = (size_t) req_len;
+  hm->chunk.ptr = end;
+  hm->message.len = hm->body.len = (size_t) ~0;  // Set body length to infinite
+
+  // Parse request line
+  s = skip(s, end, " ", &hm->method);
+  s = skip(s, end, " ", &hm->uri);
+  s = skip(s, end, "\r\n", &hm->proto);
+
+  // Sanity check. Allow protocol/reason to be empty
+  if (hm->method.len == 0 || hm->uri.len == 0) return -1;
+
+  // If URI contains '?' character, setup query string
+  if ((qs = (const char *) memchr(hm->uri.ptr, '?', hm->uri.len)) != NULL) {
+    hm->query.ptr = qs + 1;
+    hm->query.len = (size_t) (&hm->uri.ptr[hm->uri.len] - (qs + 1));
+    hm->uri.len = (size_t) (qs - hm->uri.ptr);
+  }
+
+  mg_http_parse_headers(s, end, hm->headers,
+                        sizeof(hm->headers) / sizeof(hm->headers[0]));
+  if ((cl = mg_http_get_header(hm, "Content-Length")) != NULL) {
+    hm->body.len = (size_t) mg_to64(*cl);
+    hm->message.len = (size_t) req_len + hm->body.len;
+  }
+
+  // mg_http_parse() is used to parse both HTTP requests and HTTP
+  // responses. If HTTP response does not have Content-Length set, then
+  // body is read until socket is closed, i.e. body.len is infinite (~0).
+  //
+  // For HTTP requests though, according to
+  // http://tools.ietf.org/html/rfc7231#section-8.1.3,
+  // only POST and PUT methods have defined body semantics.
+  // Therefore, if Content-Length is not specified and methods are
+  // not one of PUT or POST, set body length to 0.
+  //
+  // So, if it is HTTP request, and Content-Length is not set,
+  // and method is not (PUT or POST) then reset body length to zero.
+  is_response = mg_ncasecmp(hm->method.ptr, "HTTP/", 5) == 0;
+  if (hm->body.len == (size_t) ~0 && !is_response &&
+      mg_vcasecmp(&hm->method, "PUT") != 0 &&
+      mg_vcasecmp(&hm->method, "POST") != 0) {
+    hm->body.len = 0;
+    hm->message.len = (size_t) req_len;
+  }
+
+  // The 204 (No content) responses also have 0 body length
+  if (hm->body.len == (size_t) ~0 && is_response &&
+      mg_vcasecmp(&hm->uri, "204") == 0) {
+    hm->body.len = 0;
+    hm->message.len = (size_t) req_len;
+  }
+
+  return req_len;
+}
+
+static void mg_http_vprintf_chunk(struct mg_connection *c, const char *fmt,
+                                  va_list ap) {
+  char mem[256], *buf = mem;
+  int len = mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  mg_printf(c, "%X\r\n", len);
+  mg_send(c, buf, len > 0 ? (size_t) len : 0);
+  mg_send(c, "\r\n", 2);
+  if (buf != mem) free(buf);
+}
+
+void mg_http_printf_chunk(struct mg_connection *c, const char *fmt, ...) {
+  va_list ap;
+  va_start(ap, fmt);
+  mg_http_vprintf_chunk(c, fmt, ap);
+  va_end(ap);
+}
+
+void mg_http_write_chunk(struct mg_connection *c, const char *buf, size_t len) {
+  mg_printf(c, "%lX\r\n", (unsigned long) len);
+  mg_send(c, buf, len);
+  mg_send(c, "\r\n", 2);
+}
+
+// clang-format off
+static const char *mg_http_status_code_str(int status_code) {
+  switch (status_code) {
+    case 100: return "Continue";
+    case 101: return "Switching Protocols";
+    case 102: return "Processing";
+    case 200: return "OK";
+    case 201: return "Created";
+    case 202: return "Accepted";
+    case 203: return "Non-authoritative Information";
+    case 204: return "No Content";
+    case 205: return "Reset Content";
+    case 206: return "Partial Content";
+    case 207: return "Multi-Status";
+    case 208: return "Already Reported";
+    case 226: return "IM Used";
+    case 300: return "Multiple Choices";
+    case 301: return "Moved Permanently";
+    case 302: return "Found";
+    case 303: return "See Other";
+    case 304: return "Not Modified";
+    case 305: return "Use Proxy";
+    case 307: return "Temporary Redirect";
+    case 308: return "Permanent Redirect";
+    case 400: return "Bad Request";
+    case 401: return "Unauthorized";
+    case 402: return "Payment Required";
+    case 403: return "Forbidden";
+    case 404: return "Not Found";
+    case 405: return "Method Not Allowed";
+    case 406: return "Not Acceptable";
+    case 407: return "Proxy Authentication Required";
+    case 408: return "Request Timeout";
+    case 409: return "Conflict";
+    case 410: return "Gone";
+    case 411: return "Length Required";
+    case 412: return "Precondition Failed";
+    case 413: return "Payload Too Large";
+    case 414: return "Request-URI Too Long";
+    case 415: return "Unsupported Media Type";
+    case 416: return "Requested Range Not Satisfiable";
+    case 417: return "Expectation Failed";
+    case 418: return "I'm a teapot";
+    case 421: return "Misdirected Request";
+    case 422: return "Unprocessable Entity";
+    case 423: return "Locked";
+    case 424: return "Failed Dependency";
+    case 426: return "Upgrade Required";
+    case 428: return "Precondition Required";
+    case 429: return "Too Many Requests";
+    case 431: return "Request Header Fields Too Large";
+    case 444: return "Connection Closed Without Response";
+    case 451: return "Unavailable For Legal Reasons";
+    case 499: return "Client Closed Request";
+    case 500: return "Internal Server Error";
+    case 501: return "Not Implemented";
+    case 502: return "Bad Gateway";
+    case 503: return "Service Unavailable";
+    case 504: return "Gateway Timeout";
+    case 505: return "HTTP Version Not Supported";
+    case 506: return "Variant Also Negotiates";
+    case 507: return "Insufficient Storage";
+    case 508: return "Loop Detected";
+    case 510: return "Not Extended";
+    case 511: return "Network Authentication Required";
+    case 599: return "Network Connect Timeout Error";
+    default: return "OK";
+  }
+}
+// clang-format on
+
+void mg_http_reply(struct mg_connection *c, int code, const char *headers,
+                   const char *fmt, ...) {
+  char mem[256], *buf = mem;
+  va_list ap;
+  int len;
+  va_start(ap, fmt);
+  len = mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  va_end(ap);
+  mg_printf(c, "HTTP/1.1 %d %s\r\n%sContent-Length: %d\r\n\r\n", code,
+            mg_http_status_code_str(code), headers == NULL ? "" : headers, len);
+  mg_send(c, buf, len > 0 ? (size_t) len : 0);
+  if (buf != mem) free(buf);
+}
+
+static void http_cb(struct mg_connection *, int, void *, void *);
+static void restore_http_cb(struct mg_connection *c) {
+  struct mg_fd *fd = (struct mg_fd *) c->pfn_data;
+  if (fd != NULL) fd->fs->close(fd);
+  c->pfn_data = NULL;
+  c->pfn = http_cb;
+}
+
+char *mg_http_etag(char *buf, size_t len, size_t size, time_t mtime);
+char *mg_http_etag(char *buf, size_t len, size_t size, time_t mtime) {
+  snprintf(buf, len, "\"%lx." MG_INT64_FMT "\"", (unsigned long) mtime,
+           (int64_t) size);
+  return buf;
+}
+
+int mg_http_upload(struct mg_connection *c, struct mg_http_message *hm,
+                   const char *dir) {
+  char offset[40] = "", name[200] = "", path[256];
+  mg_http_get_var(&hm->query, "offset", offset, sizeof(offset));
+  mg_http_get_var(&hm->query, "name", name, sizeof(name));
+  if (name[0] == '\0') {
+    mg_http_reply(c, 400, "", "%s", "name required");
+    return -1;
+  } else {
+    FILE *fp;
+    size_t oft = strtoul(offset, NULL, 0);
+    snprintf(path, sizeof(path), "%s%c%s", dir, MG_DIRSEP, name);
+    LOG(LL_DEBUG,
+        ("%p %d bytes @ %d [%s]", c->fd, (int) hm->body.len, (int) oft, name));
+    if ((fp = fopen(path, oft == 0 ? "wb" : "ab")) == NULL) {
+      mg_http_reply(c, 400, "", "fopen(%s): %d", name, errno);
+      return -2;
+    } else {
+      fwrite(hm->body.ptr, 1, hm->body.len, fp);
+      fclose(fp);
+      mg_http_reply(c, 200, "", "");
+      return (int) hm->body.len;
+    }
+  }
+}
+
+static void static_cb(struct mg_connection *c, int ev, void *ev_data,
+                      void *fn_data) {
+  if (ev == MG_EV_WRITE || ev == MG_EV_POLL) {
+    struct mg_fd *fd = (struct mg_fd *) fn_data;
+    // Read to send IO buffer directly, avoid extra on-stack buffer
+    size_t n, max = 2 * MG_IO_SIZE;
+    if (c->send.size < max) mg_iobuf_resize(&c->send, max);
+    if (c->send.len >= c->send.size) return;  // Rate limit
+    n = fd->fs->read(fd->fd, c->send.buf + c->send.len,
+                     c->send.size - c->send.len);
+    if (n > 0) c->send.len += n;
+    if (c->send.len < c->send.size) restore_http_cb(c);
+  } else if (ev == MG_EV_CLOSE) {
+    restore_http_cb(c);
+  }
+  (void) ev_data;
+}
+
+static struct mg_str guess_content_type(struct mg_str path, const char *extra) {
+  // clang-format off
+  struct mimeentry { struct mg_str extension, value; };
+  #define MIME_ENTRY(a, b) {{a, sizeof(a) - 1 }, { b, sizeof(b) - 1 }}
+  // clang-format on
+  const struct mimeentry tab[] = {
+      MIME_ENTRY("html", "text/html; charset=utf-8"),
+      MIME_ENTRY("htm", "text/html; charset=utf-8"),
+      MIME_ENTRY("css", "text/css; charset=utf-8"),
+      MIME_ENTRY("js", "text/javascript; charset=utf-8"),
+      MIME_ENTRY("gif", "image/gif"),
+      MIME_ENTRY("png", "image/png"),
+      MIME_ENTRY("jpg", "image/jpeg"),
+      MIME_ENTRY("jpeg", "image/jpeg"),
+      MIME_ENTRY("woff", "font/woff"),
+      MIME_ENTRY("ttf", "font/ttf"),
+      MIME_ENTRY("svg", "image/svg+xml"),
+      MIME_ENTRY("txt", "text/plain; charset=utf-8"),
+      MIME_ENTRY("avi", "video/x-msvideo"),
+      MIME_ENTRY("csv", "text/csv"),
+      MIME_ENTRY("doc", "application/msword"),
+      MIME_ENTRY("exe", "application/octet-stream"),
+      MIME_ENTRY("gz", "application/gzip"),
+      MIME_ENTRY("ico", "image/x-icon"),
+      MIME_ENTRY("json", "application/json"),
+      MIME_ENTRY("mov", "video/quicktime"),
+      MIME_ENTRY("mp3", "audio/mpeg"),
+      MIME_ENTRY("mp4", "video/mp4"),
+      MIME_ENTRY("mpeg", "video/mpeg"),
+      MIME_ENTRY("pdf", "application/pdf"),
+      MIME_ENTRY("shtml", "text/html; charset=utf-8"),
+      MIME_ENTRY("tgz", "application/tar-gz"),
+      MIME_ENTRY("wav", "audio/wav"),
+      MIME_ENTRY("webp", "image/webp"),
+      MIME_ENTRY("zip", "application/zip"),
+      MIME_ENTRY("3gp", "video/3gpp"),
+      {{0, 0}, {0, 0}},
+  };
+  size_t i = 0;
+  struct mg_str k, v, s = mg_str(extra);
+
+  // Shrink path to its extension only
+  while (i < path.len && path.ptr[path.len - i - 1] != '.') i++;
+  path.ptr += path.len - i;
+  path.len = i;
+
+  // Process user-provided mime type overrides, if any
+  while (mg_commalist(&s, &k, &v)) {
+    if (mg_strcmp(path, k) == 0) return v;
+  }
+
+  // Process built-in mime types
+  for (i = 0; tab[i].extension.ptr != NULL; i++) {
+    if (mg_strcmp(path, tab[i].extension) == 0) return tab[i].value;
+  }
+
+  return mg_str("text/plain; charset=utf-8");
+}
+
+static int getrange(struct mg_str *s, int64_t *a, int64_t *b) {
+  size_t i, numparsed = 0;
+  LOG(LL_INFO, ("%.*s", (int) s->len, s->ptr));
+  for (i = 0; i + 6 < s->len; i++) {
+    if (memcmp(&s->ptr[i], "bytes=", 6) == 0) {
+      struct mg_str p = mg_str_n(s->ptr + i + 6, s->len - i - 6);
+      if (p.len > 0 && p.ptr[0] >= '0' && p.ptr[0] <= '9') numparsed++;
+      *a = mg_to64(p);
+      // LOG(LL_INFO, ("PPP [%.*s] %d", (int) p.len, p.ptr, numparsed));
+      while (p.len && p.ptr[0] >= '0' && p.ptr[0] <= '9') p.ptr++, p.len--;
+      if (p.len && p.ptr[0] == '-') p.ptr++, p.len--;
+      *b = mg_to64(p);
+      if (p.len > 0 && p.ptr[0] >= '0' && p.ptr[0] <= '9') numparsed++;
+      // LOG(LL_INFO, ("PPP [%.*s] %d", (int) p.len, p.ptr, numparsed));
+      break;
+    }
+  }
+  return (int) numparsed;
+}
+
+void mg_http_serve_file(struct mg_connection *c, struct mg_http_message *hm,
+                        const char *path, struct mg_http_serve_opts *opts) {
+  char etag[64];
+  struct mg_fs *fs = opts->fs == NULL ? &mg_fs_posix : opts->fs;
+  struct mg_fd *fd = fs->open(path, MG_FS_READ);
+  size_t size = 0;
+  time_t mtime = 0;
+  struct mg_str *inm = NULL;
+
+  if (fd == NULL || fs->stat(path, &size, &mtime) == 0) {
+    LOG(LL_DEBUG, ("404 [%s] %p", path, (void *) fd));
+    mg_http_reply(c, 404, "", "%s", "Not found\n");
+    fs->close(fd);
+    // NOTE: mg_http_etag() call should go first!
+  } else if (mg_http_etag(etag, sizeof(etag), size, mtime) != NULL &&
+             (inm = mg_http_get_header(hm, "If-None-Match")) != NULL &&
+             mg_vcasecmp(inm, etag) == 0) {
+    fs->close(fd);
+    mg_printf(c, "HTTP/1.1 304 Not Modified\r\nContent-Length: 0\r\n\r\n");
+  } else {
+    int n, status = 200;
+    char range[100] = "";
+    int64_t r1 = 0, r2 = 0, cl = (int64_t) size;
+    struct mg_str mime = guess_content_type(mg_str(path), opts->mime_types);
+
+    // Handle Range header
+    struct mg_str *rh = mg_http_get_header(hm, "Range");
+    if (rh != NULL && (n = getrange(rh, &r1, &r2)) > 0 && r1 >= 0 && r2 >= 0) {
+      // If range is specified like "400-", set second limit to content len
+      if (n == 1) r2 = cl - 1;
+      if (r1 > r2 || r2 >= cl) {
+        status = 416;
+        cl = 0;
+        snprintf(range, sizeof(range),
+                 "Content-Range: bytes */" MG_INT64_FMT "\r\n", (int64_t) size);
+      } else {
+        status = 206;
+        cl = r2 - r1 + 1;
+        snprintf(range, sizeof(range),
+                 "Content-Range: bytes " MG_INT64_FMT "-" MG_INT64_FMT
+                 "/" MG_INT64_FMT "\r\n",
+                 r1, r1 + cl - 1, (int64_t) size);
+        fs->seek(fd->fd, (size_t) r1);
+      }
+    }
+
+    mg_printf(c,
+              "HTTP/1.1 %d %s\r\nContent-Type: %.*s\r\n"
+              "Etag: %s\r\nContent-Length: " MG_INT64_FMT "\r\n%s%s\r\n",
+              status, mg_http_status_code_str(status), (int) mime.len, mime.ptr,
+              etag, cl, range, opts->extra_headers ? opts->extra_headers : "");
+    if (mg_vcasecmp(&hm->method, "HEAD") == 0) {
+      c->is_draining = 1;
+      fs->close(fd);
+    } else {
+      c->pfn = static_cb;
+      c->pfn_data = fd;
+    }
+  }
+}
+
+struct printdirentrydata {
+  struct mg_connection *c;
+  struct mg_http_message *hm;
+  struct mg_http_serve_opts *opts;
+  const char *dir;
+};
+
+static void printdirentry(const char *name, void *userdata) {
+  struct printdirentrydata *d = (struct printdirentrydata *) userdata;
+  struct mg_fs *fs = d->opts->fs == NULL ? &mg_fs_posix : d->opts->fs;
+  size_t size = 0;
+  time_t t = 0;
+  char path[MG_PATH_MAX], sz[64], mod[64];
+  int flags, n = 0;
+
+  // LOG(LL_DEBUG, ("[%s] [%s]", d->dir, name));
+  if (snprintf(path, sizeof(path), "%s%c%s", d->dir, '/', name) < 0) {
+    LOG(LL_ERROR, ("%s truncated", name));
+  } else if ((flags = fs->stat(path, &size, &t)) == 0) {
+    LOG(LL_ERROR, ("%lu stat(%s): %d", d->c->id, path, errno));
+  } else {
+    const char *slash = flags & MG_FS_DIR ? "/" : "";
+    struct tm tm;
+    if (flags & MG_FS_DIR) {
+      snprintf(sz, sizeof(sz), "%s", "[DIR]");
+    } else if (size < 1024) {
+      snprintf(sz, sizeof(sz), "%d", (int) size);
+    } else if (size < 0x100000) {
+      snprintf(sz, sizeof(sz), "%.1fk", (double) size / 1024.0);
+    } else if (size < 0x40000000) {
+      snprintf(sz, sizeof(sz), "%.1fM", (double) size / 1048576);
+    } else {
+      snprintf(sz, sizeof(sz), "%.1fG", (double) size / 1073741824);
+    }
+    strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime_r(&t, &tm));
+    n = (int) mg_url_encode(name, strlen(name), path, sizeof(path));
+    mg_printf(d->c,
+              "  <tr><td><a href=\"%.*s%s\">%s%s</a></td>"
+              "<td name=%lu>%s</td><td name=" MG_INT64_FMT ">%s</td></tr>\n",
+              n, path, slash, name, slash, (unsigned long) t, mod,
+              flags & MG_FS_DIR ? (int64_t) -1 : (int64_t) size, sz);
+  }
+}
+
+static void listdir(struct mg_connection *c, struct mg_http_message *hm,
+                    struct mg_http_serve_opts *opts, char *dir) {
+  static const char *sort_js_code =
+      "<script>function srt(tb, sc, so, d) {"
+      "var tr = Array.prototype.slice.call(tb.rows, 0),"
+      "tr = tr.sort(function (a, b) { var c1 = a.cells[sc], c2 = b.cells[sc],"
+      "n1 = c1.getAttribute('name'), n2 = c2.getAttribute('name'), "
+      "t1 = a.cells[2].getAttribute('name'), "
+      "t2 = b.cells[2].getAttribute('name'); "
+      "return so * (t1 < 0 && t2 >= 0 ? -1 : t2 < 0 && t1 >= 0 ? 1 : "
+      "n1 ? parseInt(n2) - parseInt(n1) : "
+      "c1.textContent.trim().localeCompare(c2.textContent.trim())); });";
+  static const char *sort_js_code2 =
+      "for (var i = 0; i < tr.length; i++) tb.appendChild(tr[i]); "
+      "if (!d) window.location.hash = ('sc=' + sc + '&so=' + so); "
+      "};"
+      "window.onload = function() {"
+      "var tb = document.getElementById('tb');"
+      "var m = /sc=([012]).so=(1|-1)/.exec(window.location.hash) || [0, 2, 1];"
+      "var sc = m[1], so = m[2]; document.onclick = function(ev) { "
+      "var c = ev.target.rel; if (c) {if (c == sc) so *= -1; srt(tb, c, so); "
+      "sc = c; ev.preventDefault();}};"
+      "srt(tb, sc, so, true);"
+      "}"
+      "</script>";
+  struct mg_fs *fs = opts->fs == NULL ? &mg_fs_posix : opts->fs;
+  struct printdirentrydata d = {c, hm, opts, dir};
+  char tmp[10], buf[MG_PATH_MAX];
+  size_t off, n;
+  int len = mg_url_decode(hm->uri.ptr, hm->uri.len, buf, sizeof(buf), 0);
+  struct mg_str uri = len > 0 ? mg_str_n(buf, (size_t) len) : hm->uri;
+
+  mg_printf(c,
+            "HTTP/1.1 200 OK\r\n"
+            "Content-Type: text/html; charset=utf-8\r\n"
+            "%s"
+            "Content-Length:         \r\n\r\n",
+            opts->extra_headers == NULL ? "" : opts->extra_headers);
+  off = c->send.len;  // Start of body
+  mg_printf(c,
+            "<!DOCTYPE html><html><head><title>Index of %.*s</title>%s%s"
+            "<style>th,td {text-align: left; padding-right: 1em; "
+            "font-family: monospace; }</style></head>"
+            "<body><h1>Index of %.*s</h1><table cellpadding=\"0\"><thead>"
+            "<tr><th><a href=\"#\" rel=\"0\">Name</a></th><th>"
+            "<a href=\"#\" rel=\"1\">Modified</a></th>"
+            "<th><a href=\"#\" rel=\"2\">Size</a></th></tr>"
+            "<tr><td colspan=\"3\"><hr></td></tr>"
+            "</thead>"
+            "<tbody id=\"tb\">\n",
+            (int) uri.len, uri.ptr, sort_js_code, sort_js_code2, (int) uri.len,
+            uri.ptr);
+
+  fs->list(dir, printdirentry, &d);
+  mg_printf(c,
+            "</tbody><tfoot><tr><td colspan=\"3\"><hr></td></tr></tfoot>"
+            "</table><address>Mongoose v.%s</address></body></html>\n",
+            MG_VERSION);
+  n = (size_t) snprintf(tmp, sizeof(tmp), "%lu",
+                        (unsigned long) (c->send.len - off));
+  if (n > sizeof(tmp)) n = 0;
+  memcpy(c->send.buf + off - 10, tmp, n);  // Set content length
+}
+
+static void remove_double_dots(char *s) {
+  char *p = s;
+  while (*s != '\0') {
+    *p++ = *s++;
+    if (s[-1] == '/' || s[-1] == '\\') {
+      while (s[0] != '\0') {
+        if (s[0] == '/' || s[0] == '\\') {
+          s++;
+        } else if (s[0] == '.' && s[1] == '.' &&
+                   (s[2] == '/' || s[2] == '\\')) {
+          s += 2;
+        } else {
+          break;
+        }
+      }
+    }
+  }
+  *p = '\0';
+}
+
+// Resolve requested file into `path` and return its fs->stat() result
+static int uri_to_path2(struct mg_connection *c, struct mg_http_message *hm,
+                        struct mg_fs *fs, struct mg_str url, struct mg_str dir,
+                        char *path, size_t path_size) {
+  int flags = 0, tmp;
+  // Append URI to the root_dir, and sanitize it
+  size_t n = (size_t) snprintf(path, path_size, "%.*s", (int) dir.len, dir.ptr);
+  if (n > path_size) n = path_size;
+  path[path_size - 1] = '\0';
+  if ((fs->stat(path, NULL, NULL) & MG_FS_DIR) == 0) {
+    mg_http_reply(c, 400, "", "Invalid web root [%.*s]\n", (int) dir.len,
+                  dir.ptr);
+  } else {
+    if (n + 2 < path_size) path[n++] = '/', path[n] = '\0';
+    mg_url_decode(hm->uri.ptr + url.len, hm->uri.len - url.len, path + n,
+                  path_size - n, 0);
+    path[path_size - 1] = '\0';  // Double-check
+    remove_double_dots(path);
+    n = strlen(path);
+    LOG(LL_VERBOSE_DEBUG,
+        ("%lu %.*s -> %s", c->id, (int) hm->uri.len, hm->uri.ptr, path));
+    while (n > 0 && path[n - 1] == '/') path[--n] = 0;  // Trim trailing slashes
+    flags = fs->stat(path, NULL, NULL);                 // Does it exist?
+    if (flags == 0) {
+      mg_http_reply(c, 404, "", "Not found\n");  // Does not exist, doh
+    } else if ((flags & MG_FS_DIR) && hm->uri.len > 0 &&
+               hm->uri.ptr[hm->uri.len - 1] != '/') {
+      mg_printf(c,
+                "HTTP/1.1 301 Moved\r\n"
+                "Location: %.*s/\r\n"
+                "Content-Length: 0\r\n"
+                "\r\n",
+                (int) hm->uri.len, hm->uri.ptr);
+      flags = 0;
+    } else if (flags & MG_FS_DIR) {
+      if (((snprintf(path + n, path_size - n, "/" MG_HTTP_INDEX) > 0 &&
+            (tmp = fs->stat(path, NULL, NULL)) != 0) ||
+           (snprintf(path + n, path_size - n, "/index.shtml") > 0 &&
+            (tmp = fs->stat(path, NULL, NULL)) != 0))) {
+        flags = tmp;
+      } else {
+        path[n] = '\0';  // Remove appended index file name
+      }
+    }
+  }
+  return flags;
+}
+
+static int uri_to_path(struct mg_connection *c, struct mg_http_message *hm,
+                       struct mg_http_serve_opts *opts, char *path,
+                       size_t path_size) {
+  struct mg_fs *fs = opts->fs == NULL ? &mg_fs_posix : opts->fs;
+  struct mg_str k, v, s = mg_str(opts->root_dir), u = {0, 0}, p = {0, 0};
+  while (mg_commalist(&s, &k, &v)) {
+    if (v.len == 0) v = k, k = mg_str("/");
+    if (hm->uri.len < k.len) continue;
+    if (mg_strcmp(k, mg_str_n(hm->uri.ptr, k.len)) != 0) continue;
+    u = k, p = v;
+  }
+  return uri_to_path2(c, hm, fs, u, p, path, path_size);
+}
+
+void mg_http_serve_dir(struct mg_connection *c, struct mg_http_message *hm,
+                       struct mg_http_serve_opts *opts) {
+  char path[MG_PATH_MAX] = "";
+  const char *sp = opts->ssi_pattern;
+  int flags = uri_to_path(c, hm, opts, path, sizeof(path));
+  if (flags == 0) return;
+  LOG(LL_VERBOSE_DEBUG,
+      ("%.*s %s %d", (int) hm->uri.len, hm->uri.ptr, path, flags));
+  if (flags & MG_FS_DIR) {
+    listdir(c, hm, opts, path);
+  } else if (sp != NULL && mg_globmatch(sp, strlen(sp), path, strlen(path))) {
+    mg_http_serve_ssi(c, opts->root_dir, path);
+  } else {
+    mg_http_serve_file(c, hm, path, opts);
+  }
+}
+
+static bool mg_is_url_safe(int c) {
+  return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') ||
+         (c >= 'A' && c <= 'Z') || c == '.' || c == '_' || c == '-' || c == '~';
+}
+
+size_t mg_url_encode(const char *s, size_t sl, char *buf, size_t len) {
+  size_t i, n = 0;
+  for (i = 0; i < sl; i++) {
+    int c = *(unsigned char *) &s[i];
+    if (n + 4 >= len) return 0;
+    if (mg_is_url_safe(c)) {
+      buf[n++] = s[i];
+    } else {
+      buf[n++] = '%';
+      mg_hex(&s[i], 1, &buf[n]);
+      n += 2;
+    }
+  }
+  return n;
+}
+
+void mg_http_creds(struct mg_http_message *hm, char *user, size_t userlen,
+                   char *pass, size_t passlen) {
+  struct mg_str *v = mg_http_get_header(hm, "Authorization");
+  user[0] = pass[0] = '\0';
+  if (v != NULL && v->len > 6 && memcmp(v->ptr, "Basic ", 6) == 0) {
+    char buf[256];
+    int n = mg_base64_decode(v->ptr + 6, (int) v->len - 6, buf);
+    const char *p = (const char *) memchr(buf, ':', n > 0 ? (size_t) n : 0);
+    if (p != NULL) {
+      snprintf(user, userlen, "%.*s", (int) (p - buf), buf);
+      snprintf(pass, passlen, "%.*s", n - (int) (p - buf) - 1, p + 1);
+    }
+  } else if (v != NULL && v->len > 7 && memcmp(v->ptr, "Bearer ", 7) == 0) {
+    snprintf(pass, passlen, "%.*s", (int) v->len - 7, v->ptr + 7);
+  } else if ((v = mg_http_get_header(hm, "Cookie")) != NULL) {
+    struct mg_str t = mg_http_get_header_var(*v, mg_str_n("access_token", 12));
+    if (t.len > 0) snprintf(pass, passlen, "%.*s", (int) t.len, t.ptr);
+  } else {
+    mg_http_get_var(&hm->query, "access_token", pass, passlen);
+  }
+}
+
+static struct mg_str stripquotes(struct mg_str s) {
+  return s.len > 1 && s.ptr[0] == '"' && s.ptr[s.len - 1] == '"'
+             ? mg_str_n(s.ptr + 1, s.len - 2)
+             : s;
+}
+
+struct mg_str mg_http_get_header_var(struct mg_str s, struct mg_str v) {
+  size_t i;
+  for (i = 0; v.len > 0 && i + v.len + 2 < s.len; i++) {
+    if (s.ptr[i + v.len] == '=' && memcmp(&s.ptr[i], v.ptr, v.len) == 0) {
+      const char *p = &s.ptr[i + v.len + 1], *b = p, *x = &s.ptr[s.len];
+      int q = p < x && *p == '"' ? 1 : 0;
+      while (p < x &&
+             (q ? p == b || *p != '"' : *p != ';' && *p != ' ' && *p != ','))
+        p++;
+      // LOG(LL_INFO, ("[%.*s] [%.*s] [%.*s]", (int) s.len, s.ptr, (int) v.len,
+      // v.ptr, (int) (p - b), b));
+      return stripquotes(mg_str_n(b, (size_t) (p - b + q)));
+    }
+  }
+  return mg_str_n(NULL, 0);
+}
+
+bool mg_http_match_uri(const struct mg_http_message *hm, const char *glob) {
+  return mg_globmatch(glob, strlen(glob), hm->uri.ptr, hm->uri.len);
+}
+
+static size_t get_chunk_length(const char *buf, size_t len, size_t *ll) {
+  size_t i = 0, n;
+  while (i < len && buf[i] != '\r' && i != '\n') i++;
+  n = mg_unhexn((char *) buf, i);
+  while (i < len && (buf[i] == '\r' || i == '\n')) i++;
+  // LOG(LL_INFO, ("len %zu i %zu n %zu ", len, i, n));
+  if (ll != NULL) *ll = i + 1;
+  if (i < len && i + n + 2 < len) return i + n + 3;
+  return 0;
+}
+
+// Walk through all chunks in the chunked body. For each chunk, fire
+// an MG_EV_HTTP_CHUNK event.
+static void walkchunks(struct mg_connection *c, struct mg_http_message *hm,
+                       size_t reqlen) {
+  size_t off = 0, bl, ll;
+  while (off + reqlen < c->recv.len) {
+    char *buf = (char *) &c->recv.buf[reqlen];
+    size_t memo = c->recv.len;
+    size_t cl = get_chunk_length(&buf[off], memo - reqlen - off, &ll);
+    // LOG(LL_INFO, ("len %zu off %zu cl %zu ll %zu", len, off, cl, ll));
+    if (cl == 0) break;
+    hm->chunk = mg_str_n(&buf[off + ll], cl < ll + 2 ? 0 : cl - ll - 2);
+    mg_call(c, MG_EV_HTTP_CHUNK, hm);
+    // Increase offset only if user has not deleted this chunk
+    if (memo == c->recv.len) off += cl;
+    if (cl <= 5) {
+      // Zero chunk - last one. Prepare body - cut off chunk lengths
+      off = bl = 0;
+      while (off + reqlen < c->recv.len) {
+        char *buf2 = (char *) &c->recv.buf[reqlen];
+        size_t memo2 = c->recv.len;
+        size_t cl2 = get_chunk_length(&buf2[off], memo2 - reqlen - off, &ll);
+        size_t n = cl2 < ll + 2 ? 0 : cl2 - ll - 2;
+        memmove(buf2 + bl, buf2 + off + ll, n);
+        bl += n;
+        off += cl2;
+        if (cl2 <= 5) break;
+      }
+      // LOG(LL_INFO, ("BL->%d del %d off %d", (int) bl, (int) del, (int) off));
+      c->recv.len -= off - bl;
+      // Set message length to indicate we've received
+      // everything, to fire MG_EV_HTTP_MSG
+      hm->message.len = bl + reqlen;
+      hm->body.len = bl;
+      break;
+    }
+  }
+}
+
+static bool mg_is_chunked(struct mg_http_message *hm) {
+  struct mg_str needle = mg_str_n("chunked", 7);
+  struct mg_str *te = mg_http_get_header(hm, "Transfer-Encoding");
+  return te != NULL && mg_strstr(*te, needle) != NULL;
+}
+
+void mg_http_delete_chunk(struct mg_connection *c, struct mg_http_message *hm) {
+  struct mg_str ch = hm->chunk;
+  if (mg_is_chunked(hm)) {
+    ch.len += 4;  // \r\n before and after the chunk
+    ch.ptr -= 2;
+    while (ch.ptr > hm->body.ptr && *ch.ptr != '\n') ch.ptr--, ch.len++;
+  }
+  {
+    const char *end = &ch.ptr[ch.len];
+    size_t n = (size_t) (end - (char *) c->recv.buf);
+    if (c->recv.len > n) {
+      memmove((char *) ch.ptr, end, (size_t) (c->recv.len - n));
+    }
+    // LOG(LL_INFO, ("DELETING CHUNK: %zu %zu %zu\n%.*s", c->recv.len, n,
+    // ch.len, (int) ch.len, ch.ptr));
+  }
+  c->recv.len -= ch.len;
+}
+
+static void http_cb(struct mg_connection *c, int ev, void *evd, void *fnd) {
+  if (ev == MG_EV_READ || ev == MG_EV_CLOSE) {
+    struct mg_http_message hm;
+    for (;;) {
+      int n = mg_http_parse((char *) c->recv.buf, c->recv.len, &hm);
+      bool is_chunked = n > 0 && mg_is_chunked(&hm);
+      if (ev == MG_EV_CLOSE) {
+        hm.message.len = c->recv.len;
+        hm.body.len = hm.message.len - (size_t) (hm.body.ptr - hm.message.ptr);
+      } else if (is_chunked && n > 0) {
+        walkchunks(c, &hm, (size_t) n);
+      }
+      // LOG(LL_INFO,
+      //("---->%d %d\n%.*s", n, is_chunked, (int) c->recv.len, c->recv.buf));
+      if (n < 0 && ev == MG_EV_READ) {
+        mg_error(c, "HTTP parse:\n%.*s", (int) c->recv.len, c->recv.buf);
+        break;
+      } else if (n > 0 && (size_t) c->recv.len >= hm.message.len) {
+        mg_call(c, MG_EV_HTTP_MSG, &hm);
+        mg_iobuf_del(&c->recv, 0, hm.message.len);
+      } else {
+        if (n > 0 && !is_chunked) {
+          hm.chunk =
+              mg_str_n((char *) &c->recv.buf[n], c->recv.len - (size_t) n);
+          mg_call(c, MG_EV_HTTP_CHUNK, &hm);
+        }
+        break;
+      }
+    }
+  }
+  (void) fnd;
+  (void) evd;
+}
+
+struct mg_connection *mg_http_connect(struct mg_mgr *mgr, const char *url,
+                                      mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = mg_connect(mgr, url, fn, fn_data);
+  if (c != NULL) c->pfn = http_cb;
+  return c;
+}
+
+struct mg_connection *mg_http_listen(struct mg_mgr *mgr, const char *url,
+                                     mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = mg_listen(mgr, url, fn, fn_data);
+  if (c != NULL) c->pfn = http_cb;
+  return c;
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/iobuf.c"
+#endif
+
+
+
+#include <string.h>
+
+// Not using memset for zeroing memory, cause it can be dropped by compiler
+// See https://github.com/cesanta/mongoose/pull/1265
+static void zeromem(volatile unsigned char *buf, size_t len) {
+  if (buf != NULL) {
+    while (len--) *buf++ = 0;
+  }
+}
+
+int mg_iobuf_resize(struct mg_iobuf *io, size_t new_size) {
+  int ok = 1;
+  if (new_size == 0) {
+    zeromem(io->buf, io->size);
+    free(io->buf);
+    io->buf = NULL;
+    io->len = io->size = 0;
+  } else if (new_size != io->size) {
+    // NOTE(lsm): do not use realloc here. Use calloc/free only, to ease the
+    // porting to some obscure platforms like FreeRTOS
+    void *p = calloc(1, new_size);
+    if (p != NULL) {
+      size_t len = new_size < io->len ? new_size : io->len;
+      if (len > 0) memcpy(p, io->buf, len);
+      zeromem(io->buf, io->size);
+      free(io->buf);
+      io->buf = (unsigned char *) p;
+      io->size = new_size;
+    } else {
+      ok = 0;
+      LOG(LL_ERROR,
+          ("%lu->%lu", (unsigned long) io->size, (unsigned long) new_size));
+    }
+  }
+  return ok;
+}
+
+int mg_iobuf_init(struct mg_iobuf *io, size_t size) {
+  return mg_iobuf_resize(io, size);
+}
+
+size_t mg_iobuf_add(struct mg_iobuf *io, size_t ofs, const void *buf,
+                    size_t len, size_t chunk_size) {
+  size_t new_size = io->len + len;
+  if (new_size > io->size) {
+    new_size += chunk_size;             // Make sure that io->size
+    new_size -= new_size % chunk_size;  // is aligned by chunk_size boundary
+    mg_iobuf_resize(io, new_size);      // Attempt to realloc
+    if (new_size != io->size) len = 0;  // Realloc failure, append nothing
+  }
+  if (ofs < io->len) memmove(io->buf + ofs + len, io->buf + ofs, io->len - ofs);
+  if (buf != NULL) memmove(io->buf + ofs, buf, len);
+  if (ofs > io->len) io->len += ofs - io->len;
+  io->len += len;
+  return len;
+}
+
+size_t mg_iobuf_del(struct mg_iobuf *io, size_t ofs, size_t len) {
+  if (ofs > io->len) ofs = io->len;
+  if (ofs + len > io->len) len = io->len - ofs;
+  memmove(io->buf + ofs, io->buf + ofs + len, io->len - ofs - len);
+  zeromem(io->buf + io->len - len, len);
+  io->len -= len;
+  return len;
+}
+
+void mg_iobuf_free(struct mg_iobuf *io) {
+  mg_iobuf_resize(io, 0);
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/log.c"
+#endif
+
+
+
+#if MG_ENABLE_LOG
+static void mg_log_stdout(const void *buf, size_t len, void *userdata) {
+  (void) userdata;
+  fwrite(buf, 1, len, stdout);
+}
+
+static const char *s_spec = "2";
+static void (*s_fn)(const void *, size_t, void *) = mg_log_stdout;
+static void *s_fn_param = NULL;
+
+void mg_log_set(const char *spec) {
+  LOG(LL_DEBUG, ("Setting log level to %s", spec));
+  s_spec = spec;
+}
+
+bool mg_log_prefix(int level, const char *file, int line, const char *fname) {
+  // static unsigned long seq;
+  int max = LL_INFO;
+  struct mg_str k, v, s = mg_str(s_spec);
+  const char *p = strrchr(file, '/');
+
+  if (s_fn == NULL) return false;
+
+  if (p == NULL) p = strrchr(file, '\\');
+  p = p == NULL ? file : p + 1;
+
+  while (mg_commalist(&s, &k, &v)) {
+    if (v.len == 0) max = atoi(k.ptr);
+    if (v.len > 0 && strncmp(p, k.ptr, k.len) == 0) max = atoi(v.ptr);
+  }
+
+  if (level <= max) {
+    char timebuf[21], buf[50] = "";
+    time_t t = time(NULL);
+    struct tm tmp, *tm = gmtime_r(&t, &tmp);
+    int n;
+    (void) tmp;
+    strftime(timebuf, sizeof(timebuf), "%Y-%m-%d %H:%M:%S", tm);
+    n = snprintf(buf, sizeof(buf), "%s %d %s:%d:%s", timebuf, level, p, line,
+                 fname);
+    if (n < 0 || n > (int) sizeof(buf) - 2) n = sizeof(buf) - 2;
+    while (n < (int) sizeof(buf) - 1) buf[n++] = ' ';
+    s_fn(buf, sizeof(buf) - 1, s_fn_param);
+    return true;
+  } else {
+    return false;
+  }
+}
+
+void mg_log(const char *fmt, ...) {
+  char mem[256], *buf = mem;
+  va_list ap;
+  int len = 0;
+  va_start(ap, fmt);
+  len = mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  va_end(ap);
+  s_fn(buf, len > 0 ? (size_t) len : 0, s_fn_param);
+  s_fn("\n", 1, s_fn_param);
+  if (buf != mem) free(buf);
+}
+
+void mg_log_set_callback(void (*fn)(const void *, size_t, void *), void *fnd) {
+  s_fn = fn;
+  s_fn_param = fnd;
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/md5.c"
+#endif
+#include <string.h>
+
+
+#if defined(MG_ENABLE_MD5) && MG_ENABLE_MD5
+#if !defined(BYTE_ORDER) && defined(__BYTE_ORDER)
+#define BYTE_ORDER __BYTE_ORDER
+#ifndef LITTLE_ENDIAN
+#define LITTLE_ENDIAN __LITTLE_ENDIAN
+#endif /* LITTLE_ENDIAN */
+#ifndef BIG_ENDIAN
+#define BIG_ENDIAN __LITTLE_ENDIAN
+#endif /* BIG_ENDIAN */
+#endif /* BYTE_ORDER */
+
+static void mg_byte_reverse(unsigned char *buf, unsigned longs) {
+/* Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN */
+#if BYTE_ORDER == BIG_ENDIAN
+  do {
+    uint32_t t = (uint32_t)((unsigned) buf[3] << 8 | buf[2]) << 16 |
+                 ((unsigned) buf[1] << 8 | buf[0]);
+    *(uint32_t *) buf = t;
+    buf += 4;
+  } while (--longs);
+#else
+  (void) buf;
+  (void) longs;
+#endif
+}
+
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+#define MD5STEP(f, w, x, y, z, data, s) \
+  (w += f(x, y, z) + data, w = w << s | w >> (32 - s), w += x)
+
+/*
+ * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
+ * initialization constants.
+ */
+void mg_md5_init(mg_md5_ctx *ctx) {
+  ctx->buf[0] = 0x67452301;
+  ctx->buf[1] = 0xefcdab89;
+  ctx->buf[2] = 0x98badcfe;
+  ctx->buf[3] = 0x10325476;
+
+  ctx->bits[0] = 0;
+  ctx->bits[1] = 0;
+}
+
+static void mg_md5_transform(uint32_t buf[4], uint32_t const in[16]) {
+  uint32_t a, b, c, d;
+
+  a = buf[0];
+  b = buf[1];
+  c = buf[2];
+  d = buf[3];
+
+  MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+  MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+  MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+  MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+  MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+  MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+  MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+  MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+  MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+  MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+  MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+  MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+  MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+  MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+  MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+  MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+  MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+  MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+  MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+  MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+  MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+  MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+  MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+  MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+  MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+  MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+  MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+  MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+  MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+  MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+  MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+  MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+  MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+  MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+  MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+  MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+  MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+  MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+  MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+  MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+  MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+  MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+  MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+  MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+  MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+  MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+  MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+  MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+  MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+  MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+  MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+  MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+  MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+  MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+  MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+  MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+  MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+  MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+  MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+  MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+  MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+  MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+  MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+  MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+  buf[0] += a;
+  buf[1] += b;
+  buf[2] += c;
+  buf[3] += d;
+}
+
+void mg_md5_update(mg_md5_ctx *ctx, const unsigned char *buf, size_t len) {
+  uint32_t t;
+
+  t = ctx->bits[0];
+  if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t) ctx->bits[1]++;
+  ctx->bits[1] += (uint32_t) len >> 29;
+
+  t = (t >> 3) & 0x3f;
+
+  if (t) {
+    unsigned char *p = (unsigned char *) ctx->in + t;
+
+    t = 64 - t;
+    if (len < t) {
+      memcpy(p, buf, len);
+      return;
+    }
+    memcpy(p, buf, t);
+    mg_byte_reverse(ctx->in, 16);
+    mg_md5_transform(ctx->buf, (uint32_t *) ctx->in);
+    buf += t;
+    len -= t;
+  }
+
+  while (len >= 64) {
+    memcpy(ctx->in, buf, 64);
+    mg_byte_reverse(ctx->in, 16);
+    mg_md5_transform(ctx->buf, (uint32_t *) ctx->in);
+    buf += 64;
+    len -= 64;
+  }
+
+  memcpy(ctx->in, buf, len);
+}
+
+void mg_md5_final(mg_md5_ctx *ctx, unsigned char digest[16]) {
+  unsigned count;
+  unsigned char *p;
+  uint32_t *a;
+
+  count = (ctx->bits[0] >> 3) & 0x3F;
+
+  p = ctx->in + count;
+  *p++ = 0x80;
+  count = 64 - 1 - count;
+  if (count < 8) {
+    memset(p, 0, count);
+    mg_byte_reverse(ctx->in, 16);
+    mg_md5_transform(ctx->buf, (uint32_t *) ctx->in);
+    memset(ctx->in, 0, 56);
+  } else {
+    memset(p, 0, count - 8);
+  }
+  mg_byte_reverse(ctx->in, 14);
+
+  a = (uint32_t *) ctx->in;
+  a[14] = ctx->bits[0];
+  a[15] = ctx->bits[1];
+
+  mg_md5_transform(ctx->buf, (uint32_t *) ctx->in);
+  mg_byte_reverse((unsigned char *) ctx->buf, 4);
+  memcpy(digest, ctx->buf, 16);
+  memset((char *) ctx, 0, sizeof(*ctx));
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/mqtt.c"
+#endif
+
+
+
+
+
+
+
+
+#define MQTT_CLEAN_SESSION 0x02
+#define MQTT_HAS_WILL 0x04
+#define MQTT_WILL_RETAIN 0x20
+#define MQTT_HAS_PASSWORD 0x40
+#define MQTT_HAS_USER_NAME 0x80
+
+enum { MQTT_OK, MQTT_INCOMPLETE, MQTT_MALFORMED };
+
+void mg_mqtt_send_header(struct mg_connection *c, uint8_t cmd, uint8_t flags,
+                         uint32_t len) {
+  uint8_t buf[1 + sizeof(len)], *vlen = &buf[1];
+  buf[0] = (uint8_t) ((cmd << 4) | flags);
+  do {
+    *vlen = len % 0x80;
+    len /= 0x80;
+    if (len > 0) *vlen |= 0x80;
+    vlen++;
+  } while (len > 0 && vlen < &buf[sizeof(buf)]);
+  mg_send(c, buf, (size_t) (vlen - buf));
+}
+
+static void mg_send_u16(struct mg_connection *c, uint16_t value) {
+  mg_send(c, &value, sizeof(value));
+}
+
+void mg_mqtt_login(struct mg_connection *c, struct mg_mqtt_opts *opts) {
+  char rnd[9], client_id[16];
+  struct mg_str cid = opts->client_id;
+  uint32_t total_len = 7 + 1 + 2 + 2;
+  uint8_t connflag = (uint8_t) ((opts->qos & 3) << 1);
+
+  if (cid.len == 0) {
+    mg_random(rnd, sizeof(rnd));
+    mg_base64_encode((unsigned char *) rnd, sizeof(rnd), client_id);
+    client_id[sizeof(client_id) - 1] = '\0';
+    cid = mg_str(client_id);
+  }
+
+  if (opts->user.len > 0) {
+    total_len += 2 + (uint32_t) opts->user.len;
+    connflag |= MQTT_HAS_USER_NAME;
+  }
+  if (opts->pass.len > 0) {
+    total_len += 2 + (uint32_t) opts->pass.len;
+    connflag |= MQTT_HAS_PASSWORD;
+  }
+  if (opts->will_topic.len > 0 && opts->will_message.len > 0) {
+    total_len +=
+        4 + (uint32_t) opts->will_topic.len + (uint32_t) opts->will_message.len;
+    connflag |= MQTT_HAS_WILL;
+  }
+  if (opts->clean || cid.len == 0) connflag |= MQTT_CLEAN_SESSION;
+  if (opts->will_retain) connflag |= MQTT_WILL_RETAIN;
+  total_len += (uint32_t) cid.len;
+
+  mg_mqtt_send_header(c, MQTT_CMD_CONNECT, 0, total_len);
+  mg_send(c, "\00\04MQTT\04", 7);
+  mg_send(c, &connflag, sizeof(connflag));
+  // keepalive == 0 means "do not disconnect us!"
+  mg_send_u16(c, mg_htons((uint16_t) opts->keepalive));
+  mg_send_u16(c, mg_htons((uint16_t) cid.len));
+  mg_send(c, cid.ptr, cid.len);
+  if (connflag & MQTT_HAS_WILL) {
+    mg_send_u16(c, mg_htons((uint16_t) opts->will_topic.len));
+    mg_send(c, opts->will_topic.ptr, opts->will_topic.len);
+    mg_send_u16(c, mg_htons((uint16_t) opts->will_message.len));
+    mg_send(c, opts->will_message.ptr, opts->will_message.len);
+  }
+  if (opts->user.len > 0) {
+    mg_send_u16(c, mg_htons((uint16_t) opts->user.len));
+    mg_send(c, opts->user.ptr, opts->user.len);
+  }
+  if (opts->pass.len > 0) {
+    mg_send_u16(c, mg_htons((uint16_t) opts->pass.len));
+    mg_send(c, opts->pass.ptr, opts->pass.len);
+  }
+}
+
+void mg_mqtt_pub(struct mg_connection *c, struct mg_str *topic,
+                 struct mg_str *data, int qos, bool retain) {
+  uint8_t flags = (uint8_t) (((qos & 3) << 1) | (retain ? 1 : 0));
+  uint32_t total_len = 2 + (uint32_t) topic->len + (uint32_t) data->len;
+  LOG(LL_DEBUG, ("%lu [%.*s] -> [%.*s]", c->id, (int) topic->len,
+                 (char *) topic->ptr, (int) data->len, (char *) data->ptr));
+  if (qos > 0) total_len += 2;
+  mg_mqtt_send_header(c, MQTT_CMD_PUBLISH, flags, total_len);
+  mg_send_u16(c, mg_htons((uint16_t) topic->len));
+  mg_send(c, topic->ptr, topic->len);
+  if (qos > 0) {
+    static uint16_t s_id;
+    if (++s_id == 0) s_id++;
+    mg_send_u16(c, mg_htons(s_id));
+  }
+  mg_send(c, data->ptr, data->len);
+}
+
+void mg_mqtt_sub(struct mg_connection *c, struct mg_str *topic, int qos) {
+  static uint16_t s_id;
+  uint8_t qos_ = qos & 3;
+  uint32_t total_len = 2 + (uint32_t) topic->len + 2 + 1;
+  mg_mqtt_send_header(c, MQTT_CMD_SUBSCRIBE, 2, total_len);
+  if (++s_id == 0) ++s_id;
+  mg_send_u16(c, mg_htons(s_id));
+  mg_send_u16(c, mg_htons((uint16_t) topic->len));
+  mg_send(c, topic->ptr, topic->len);
+  mg_send(c, &qos_, sizeof(qos_));
+}
+
+int mg_mqtt_parse(const uint8_t *buf, size_t len, struct mg_mqtt_message *m) {
+  uint8_t lc = 0, *p, *end;
+  uint32_t n = 0, len_len = 0;
+
+  memset(m, 0, sizeof(*m));
+  m->dgram.ptr = (char *) buf;
+  if (len < 2) return MQTT_INCOMPLETE;
+  m->cmd = (uint8_t) (buf[0] >> 4);
+  m->qos = (buf[0] >> 1) & 3;
+
+  n = len_len = 0;
+  p = (uint8_t *) buf + 1;
+  while ((size_t) (p - buf) < len) {
+    lc = *((uint8_t *) p++);
+    n += (uint32_t) ((lc & 0x7f) << 7 * len_len);
+    len_len++;
+    if (!(lc & 0x80)) break;
+    if (len_len >= 4) return MQTT_MALFORMED;
+  }
+  end = p + n;
+  if (lc & 0x80 || end > buf + len) return MQTT_INCOMPLETE;
+  m->dgram.len = (size_t) (end - buf);
+
+  switch (m->cmd) {
+    case MQTT_CMD_CONNACK:
+      if (end - p < 2) return MQTT_MALFORMED;
+      m->ack = p[1];
+      break;
+    case MQTT_CMD_PUBACK:
+    case MQTT_CMD_PUBREC:
+    case MQTT_CMD_PUBREL:
+    case MQTT_CMD_PUBCOMP:
+    case MQTT_CMD_SUBACK:
+      if (p + 2 > end) return MQTT_MALFORMED;
+      m->id = (uint16_t) ((((uint16_t) p[0]) << 8) | p[1]);
+      break;
+    case MQTT_CMD_SUBSCRIBE: {
+      if (p + 2 > end) return MQTT_MALFORMED;
+      m->id = (uint16_t) ((((uint16_t) p[0]) << 8) | p[1]);
+      p += 2;
+      break;
+    }
+    case MQTT_CMD_PUBLISH: {
+      if (p + 2 > end) return MQTT_MALFORMED;
+      m->topic.len = (uint16_t) ((((uint16_t) p[0]) << 8) | p[1]);
+      m->topic.ptr = (char *) p + 2;
+      p += 2 + m->topic.len;
+      if (p > end) return MQTT_MALFORMED;
+      if (m->qos > 0) {
+        if (p + 2 > end) return MQTT_MALFORMED;
+        m->id = (uint16_t) ((((uint16_t) p[0]) << 8) | p[1]);
+        p += 2;
+      }
+      if (p > end) return MQTT_MALFORMED;
+      m->data.ptr = (char *) p;
+      m->data.len = (size_t) (end - p);
+      break;
+    }
+    default:
+      break;
+  }
+  return MQTT_OK;
+}
+
+static size_t mg_mqtt_next_topic(struct mg_mqtt_message *msg,
+                                 struct mg_str *topic, uint8_t *qos,
+                                 size_t pos) {
+  unsigned char *buf = (unsigned char *) msg->dgram.ptr + pos;
+  size_t new_pos;
+  if (pos >= msg->dgram.len) return 0;
+
+  topic->len = (size_t) (((unsigned) buf[0]) << 8 | buf[1]);
+  topic->ptr = (char *) buf + 2;
+  new_pos = pos + 2 + topic->len + (qos == NULL ? 0 : 1);
+  if ((size_t) new_pos > msg->dgram.len) return 0;
+  if (qos != NULL) *qos = buf[2 + topic->len];
+  return new_pos;
+}
+
+size_t mg_mqtt_next_sub(struct mg_mqtt_message *msg, struct mg_str *topic,
+                        uint8_t *qos, size_t pos) {
+  uint8_t tmp;
+  return mg_mqtt_next_topic(msg, topic, qos == NULL ? &tmp : qos, pos);
+}
+
+size_t mg_mqtt_next_unsub(struct mg_mqtt_message *msg, struct mg_str *topic,
+                          size_t pos) {
+  return mg_mqtt_next_topic(msg, topic, NULL, pos);
+}
+
+static void mqtt_cb(struct mg_connection *c, int ev, void *ev_data,
+                    void *fn_data) {
+  if (ev == MG_EV_READ) {
+    for (;;) {
+      struct mg_mqtt_message mm;
+      int rc = mg_mqtt_parse(c->recv.buf, c->recv.len, &mm);
+      if (rc == MQTT_MALFORMED) {
+        LOG(LL_ERROR, ("%lu MQTT malformed message", c->id));
+        c->is_closing = 1;
+        break;
+      } else if (rc == MQTT_OK) {
+        LOG(LL_VERBOSE_DEBUG,
+            ("%p MQTT CMD %d len %d [%.*s]", c->fd, mm.cmd, (int) mm.dgram.len,
+             (int) mm.data.len, mm.data.ptr));
+        switch (mm.cmd) {
+          case MQTT_CMD_CONNACK:
+            mg_call(c, MG_EV_MQTT_OPEN, &mm.ack);
+            if (mm.ack == 0) {
+              LOG(LL_INFO, ("%lu Connected", c->id));
+            } else {
+              LOG(LL_ERROR, ("%lu MQTT auth failed, code %d", c->id, mm.ack));
+              c->is_closing = 1;
+            }
+            break;
+          case MQTT_CMD_PUBLISH: {
+            LOG(LL_DEBUG, ("%lu [%.*s] -> [%.*s]", c->id, (int) mm.topic.len,
+                           mm.topic.ptr, (int) mm.data.len, mm.data.ptr));
+            mg_call(c, MG_EV_MQTT_MSG, &mm);
+            break;
+          }
+        }
+        mg_call(c, MG_EV_MQTT_CMD, &mm);
+        mg_iobuf_del(&c->recv, 0, mm.dgram.len);
+      } else {
+        break;
+      }
+    }
+  }
+  (void) ev_data;
+  (void) fn_data;
+}
+
+void mg_mqtt_ping(struct mg_connection *nc) {
+  mg_mqtt_send_header(nc, MQTT_CMD_PINGREQ, 0, 0);
+}
+
+void mg_mqtt_pong(struct mg_connection *nc) {
+  mg_mqtt_send_header(nc, MQTT_CMD_PINGRESP, 0, 0);
+}
+
+void mg_mqtt_disconnect(struct mg_connection *nc) {
+  mg_mqtt_send_header(nc, MQTT_CMD_DISCONNECT, 0, 0);
+}
+
+struct mg_connection *mg_mqtt_connect(struct mg_mgr *mgr, const char *url,
+                                      struct mg_mqtt_opts *opts,
+                                      mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = mg_connect(mgr, url, fn, fn_data);
+  if (c != NULL) {
+    struct mg_mqtt_opts empty;
+    memset(&empty, 0, sizeof(empty));
+    mg_mqtt_login(c, opts == NULL ? &empty : opts);
+    c->pfn = mqtt_cb;
+  }
+  return c;
+}
+
+struct mg_connection *mg_mqtt_listen(struct mg_mgr *mgr, const char *url,
+                                     mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = mg_listen(mgr, url, fn, fn_data);
+  if (c != NULL) c->pfn = mqtt_cb, c->pfn_data = mgr;
+  return c;
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/net.c"
+#endif
+
+
+
+
+int mg_vprintf(struct mg_connection *c, const char *fmt, va_list ap) {
+  char mem[256], *buf = mem;
+  int len = mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  len = mg_send(c, buf, len > 0 ? (size_t) len : 0);
+  if (buf != mem) free(buf);
+  return len;
+}
+
+int mg_printf(struct mg_connection *c, const char *fmt, ...) {
+  int len = 0;
+  va_list ap;
+  va_start(ap, fmt);
+  len = mg_vprintf(c, fmt, ap);
+  va_end(ap);
+  return len;
+}
+
+char *mg_straddr(struct mg_connection *c, char *buf, size_t len) {
+  char tmp[100];
+  const char *fmt = c->peer.is_ip6 ? "[%s]:%d" : "%s:%d";
+  mg_ntoa(&c->peer, tmp, sizeof(tmp));
+  snprintf(buf, len, fmt, tmp, (int) mg_ntohs(c->peer.port));
+  return buf;
+}
+
+char *mg_ntoa(const struct mg_addr *addr, char *buf, size_t len) {
+  if (addr->is_ip6) {
+    uint16_t *p = (uint16_t *) addr->ip6;
+    snprintf(buf, len, "%x:%x:%x:%x:%x:%x:%x:%x", mg_htons(p[0]),
+             mg_htons(p[1]), mg_htons(p[2]), mg_htons(p[3]), mg_htons(p[4]),
+             mg_htons(p[5]), mg_htons(p[6]), mg_htons(p[7]));
+  } else {
+    uint8_t p[4];
+    memcpy(p, &addr->ip, sizeof(p));
+    snprintf(buf, len, "%d.%d.%d.%d", (int) p[0], (int) p[1], (int) p[2],
+             (int) p[3]);
+  }
+  return buf;
+}
+
+static bool mg_atonl(struct mg_str str, struct mg_addr *addr) {
+  if (mg_vcasecmp(&str, "localhost") != 0) return false;
+  addr->ip = mg_htonl(0x7f000001);
+  addr->is_ip6 = false;
+  return true;
+}
+
+static bool mg_atone(struct mg_str str, struct mg_addr *addr) {
+  if (str.len > 0) return false;
+  addr->ip = 0;
+  addr->is_ip6 = false;
+  return true;
+}
+
+static bool mg_aton4(struct mg_str str, struct mg_addr *addr) {
+  uint8_t data[4] = {0, 0, 0, 0};
+  size_t i, num_dots = 0;
+  for (i = 0; i < str.len; i++) {
+    if (str.ptr[i] >= '0' && str.ptr[i] <= '9') {
+      int octet = data[num_dots] * 10 + (str.ptr[i] - '0');
+      if (octet > 255) return false;
+      data[num_dots] = (uint8_t) octet;
+    } else if (str.ptr[i] == '.') {
+      if (num_dots >= 3 || i == 0 || str.ptr[i - 1] == '.') return false;
+      num_dots++;
+    } else {
+      return false;
+    }
+  }
+  if (num_dots != 3 || str.ptr[i - 1] == '.') return false;
+  memcpy(&addr->ip, data, sizeof(data));
+  addr->is_ip6 = false;
+  return true;
+}
+
+static bool mg_v4mapped(struct mg_str str, struct mg_addr *addr) {
+  int i;
+  if (str.len < 14) return false;
+  if (str.ptr[0] != ':' || str.ptr[1] != ':' || str.ptr[6] != ':') return false;
+  for (i = 2; i < 6; i++) {
+    if (str.ptr[i] != 'f' && str.ptr[i] != 'F') return false;
+  }
+  if (!mg_aton4(mg_str_n(&str.ptr[7], str.len - 7), addr)) return false;
+  memset(addr->ip6, 0, sizeof(addr->ip6));
+  addr->ip6[10] = addr->ip6[11] = 255;
+  memcpy(&addr->ip6[12], &addr->ip, 4);
+  addr->is_ip6 = true;
+  return true;
+}
+
+static bool mg_aton6(struct mg_str str, struct mg_addr *addr) {
+  size_t i, j = 0, n = 0, dc = 42;
+  if (str.len > 2 && str.ptr[0] == '[') str.ptr++, str.len -= 2;
+  if (mg_v4mapped(str, addr)) return true;
+  for (i = 0; i < str.len; i++) {
+    if ((str.ptr[i] >= '0' && str.ptr[i] <= '9') ||
+        (str.ptr[i] >= 'a' && str.ptr[i] <= 'f') ||
+        (str.ptr[i] >= 'A' && str.ptr[i] <= 'F')) {
+      unsigned long val;
+      if (i > j + 3) return false;
+      // LOG(LL_DEBUG, ("%zu %zu [%.*s]", i, j, (int) (i - j + 1),
+      // &str.ptr[j]));
+      val = mg_unhexn(&str.ptr[j], i - j + 1);
+      addr->ip6[n] = (uint8_t) ((val >> 8) & 255);
+      addr->ip6[n + 1] = (uint8_t) (val & 255);
+    } else if (str.ptr[i] == ':') {
+      j = i + 1;
+      if (i > 0 && str.ptr[i - 1] == ':') {
+        dc = n;  // Double colon
+        if (i > 1 && str.ptr[i - 2] == ':') return false;
+      } else if (i > 0) {
+        n += 2;
+      }
+      if (n > 14) return false;
+      addr->ip6[n] = addr->ip6[n + 1] = 0;  // For trailing ::
+    } else {
+      return false;
+    }
+  }
+  if (n < 14 && dc == 42) return false;
+  if (n < 14) {
+    memmove(&addr->ip6[dc + (14 - n)], &addr->ip6[dc], n - dc + 2);
+    memset(&addr->ip6[dc], 0, 14 - n);
+  }
+  addr->is_ip6 = true;
+  return true;
+}
+
+bool mg_aton(struct mg_str str, struct mg_addr *addr) {
+  // LOG(LL_INFO, ("[%.*s]", (int) str.len, str.ptr));
+  return mg_atone(str, addr) || mg_atonl(str, addr) || mg_aton4(str, addr) ||
+         mg_aton6(str, addr);
+}
+
+void mg_mgr_free(struct mg_mgr *mgr) {
+  struct mg_connection *c;
+  for (c = mgr->conns; c != NULL; c = c->next) c->is_closing = 1;
+  mg_mgr_poll(mgr, 0);
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
+  FreeRTOS_DeleteSocketSet(mgr->ss);
+#endif
+  LOG(LL_INFO, ("All connections closed"));
+}
+
+void mg_mgr_init(struct mg_mgr *mgr) {
+  memset(mgr, 0, sizeof(*mgr));
+#if defined(_WIN32) && MG_ENABLE_WINSOCK
+  // clang-format off
+  { WSADATA data; WSAStartup(MAKEWORD(2, 2), &data); }
+  // clang-format on
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP
+  mgr->ss = FreeRTOS_CreateSocketSet();
+#elif defined(__unix) || defined(__unix__) || defined(__APPLE__)
+  // Ignore SIGPIPE signal, so if client cancels the request, it
+  // won't kill the whole process.
+  signal(SIGPIPE, SIG_IGN);
+#endif
+  mgr->dnstimeout = 3000;
+  mgr->dns4.url = "udp://8.8.8.8:53";
+  mgr->dns6.url = "udp://[2001:4860:4860::8888]:53";
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/sha1.c"
+#endif
+/* Copyright(c) By Steve Reid <steve@edmweb.com> */
+/* 100% Public Domain */
+
+#include <string.h>
+
+/*
+ * clang with std=-c99 uses __LITTLE_ENDIAN, by default
+ * while for ex, RTOS gcc - LITTLE_ENDIAN, by default
+ * it depends on __USE_BSD, but let's have everything
+ */
+#if !defined(BYTE_ORDER) && defined(__BYTE_ORDER)
+#define BYTE_ORDER __BYTE_ORDER
+#ifndef LITTLE_ENDIAN
+#define LITTLE_ENDIAN __LITTLE_ENDIAN
+#endif /* LITTLE_ENDIAN */
+#ifndef BIG_ENDIAN
+#define BIG_ENDIAN __LITTLE_ENDIAN
+#endif /* BIG_ENDIAN */
+#endif /* BYTE_ORDER */
+
+union char64long16 {
+  unsigned char c[64];
+  uint32_t l[16];
+};
+
+#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
+
+static uint32_t blk0(union char64long16 *block, int i) {
+/* Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN */
+#if BYTE_ORDER == LITTLE_ENDIAN
+  block->l[i] =
+      (rol(block->l[i], 24) & 0xFF00FF00) | (rol(block->l[i], 8) & 0x00FF00FF);
+#endif
+  return block->l[i];
+}
+
+/* Avoid redefine warning (ARM /usr/include/sys/ucontext.h define R0~R4) */
+#undef blk
+#undef R0
+#undef R1
+#undef R2
+#undef R3
+#undef R4
+
+#define blk(i)                                                               \
+  (block->l[i & 15] = rol(block->l[(i + 13) & 15] ^ block->l[(i + 8) & 15] ^ \
+                              block->l[(i + 2) & 15] ^ block->l[i & 15],     \
+                          1))
+#define R0(v, w, x, y, z, i)                                          \
+  z += ((w & (x ^ y)) ^ y) + blk0(block, i) + 0x5A827999 + rol(v, 5); \
+  w = rol(w, 30);
+#define R1(v, w, x, y, z, i)                                  \
+  z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \
+  w = rol(w, 30);
+#define R2(v, w, x, y, z, i)                          \
+  z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5); \
+  w = rol(w, 30);
+#define R3(v, w, x, y, z, i)                                        \
+  z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \
+  w = rol(w, 30);
+#define R4(v, w, x, y, z, i)                          \
+  z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \
+  w = rol(w, 30);
+
+static void mg_sha1_transform(uint32_t state[5], const unsigned char buffer[64]) {
+  uint32_t a, b, c, d, e;
+  union char64long16 block[1];
+
+  memcpy(block, buffer, 64);
+  a = state[0];
+  b = state[1];
+  c = state[2];
+  d = state[3];
+  e = state[4];
+  R0(a, b, c, d, e, 0);
+  R0(e, a, b, c, d, 1);
+  R0(d, e, a, b, c, 2);
+  R0(c, d, e, a, b, 3);
+  R0(b, c, d, e, a, 4);
+  R0(a, b, c, d, e, 5);
+  R0(e, a, b, c, d, 6);
+  R0(d, e, a, b, c, 7);
+  R0(c, d, e, a, b, 8);
+  R0(b, c, d, e, a, 9);
+  R0(a, b, c, d, e, 10);
+  R0(e, a, b, c, d, 11);
+  R0(d, e, a, b, c, 12);
+  R0(c, d, e, a, b, 13);
+  R0(b, c, d, e, a, 14);
+  R0(a, b, c, d, e, 15);
+  R1(e, a, b, c, d, 16);
+  R1(d, e, a, b, c, 17);
+  R1(c, d, e, a, b, 18);
+  R1(b, c, d, e, a, 19);
+  R2(a, b, c, d, e, 20);
+  R2(e, a, b, c, d, 21);
+  R2(d, e, a, b, c, 22);
+  R2(c, d, e, a, b, 23);
+  R2(b, c, d, e, a, 24);
+  R2(a, b, c, d, e, 25);
+  R2(e, a, b, c, d, 26);
+  R2(d, e, a, b, c, 27);
+  R2(c, d, e, a, b, 28);
+  R2(b, c, d, e, a, 29);
+  R2(a, b, c, d, e, 30);
+  R2(e, a, b, c, d, 31);
+  R2(d, e, a, b, c, 32);
+  R2(c, d, e, a, b, 33);
+  R2(b, c, d, e, a, 34);
+  R2(a, b, c, d, e, 35);
+  R2(e, a, b, c, d, 36);
+  R2(d, e, a, b, c, 37);
+  R2(c, d, e, a, b, 38);
+  R2(b, c, d, e, a, 39);
+  R3(a, b, c, d, e, 40);
+  R3(e, a, b, c, d, 41);
+  R3(d, e, a, b, c, 42);
+  R3(c, d, e, a, b, 43);
+  R3(b, c, d, e, a, 44);
+  R3(a, b, c, d, e, 45);
+  R3(e, a, b, c, d, 46);
+  R3(d, e, a, b, c, 47);
+  R3(c, d, e, a, b, 48);
+  R3(b, c, d, e, a, 49);
+  R3(a, b, c, d, e, 50);
+  R3(e, a, b, c, d, 51);
+  R3(d, e, a, b, c, 52);
+  R3(c, d, e, a, b, 53);
+  R3(b, c, d, e, a, 54);
+  R3(a, b, c, d, e, 55);
+  R3(e, a, b, c, d, 56);
+  R3(d, e, a, b, c, 57);
+  R3(c, d, e, a, b, 58);
+  R3(b, c, d, e, a, 59);
+  R4(a, b, c, d, e, 60);
+  R4(e, a, b, c, d, 61);
+  R4(d, e, a, b, c, 62);
+  R4(c, d, e, a, b, 63);
+  R4(b, c, d, e, a, 64);
+  R4(a, b, c, d, e, 65);
+  R4(e, a, b, c, d, 66);
+  R4(d, e, a, b, c, 67);
+  R4(c, d, e, a, b, 68);
+  R4(b, c, d, e, a, 69);
+  R4(a, b, c, d, e, 70);
+  R4(e, a, b, c, d, 71);
+  R4(d, e, a, b, c, 72);
+  R4(c, d, e, a, b, 73);
+  R4(b, c, d, e, a, 74);
+  R4(a, b, c, d, e, 75);
+  R4(e, a, b, c, d, 76);
+  R4(d, e, a, b, c, 77);
+  R4(c, d, e, a, b, 78);
+  R4(b, c, d, e, a, 79);
+  state[0] += a;
+  state[1] += b;
+  state[2] += c;
+  state[3] += d;
+  state[4] += e;
+  /* Erase working structures. The order of operations is important,
+   * used to ensure that compiler doesn't optimize those out. */
+  memset(block, 0, sizeof(block));
+  a = b = c = d = e = 0;
+  (void) a;
+  (void) b;
+  (void) c;
+  (void) d;
+  (void) e;
+}
+
+void mg_sha1_init(mg_sha1_ctx *context) {
+  context->state[0] = 0x67452301;
+  context->state[1] = 0xEFCDAB89;
+  context->state[2] = 0x98BADCFE;
+  context->state[3] = 0x10325476;
+  context->state[4] = 0xC3D2E1F0;
+  context->count[0] = context->count[1] = 0;
+}
+
+void mg_sha1_update(mg_sha1_ctx *context, const unsigned char *data,
+                    size_t len) {
+  size_t i, j;
+
+  j = context->count[0];
+  if ((context->count[0] += (uint32_t) len << 3) < j) context->count[1]++;
+  context->count[1] += (uint32_t)(len >> 29);
+  j = (j >> 3) & 63;
+  if ((j + len) > 63) {
+    memcpy(&context->buffer[j], data, (i = 64 - j));
+    mg_sha1_transform(context->state, context->buffer);
+    for (; i + 63 < len; i += 64) {
+      mg_sha1_transform(context->state, &data[i]);
+    }
+    j = 0;
+  } else
+    i = 0;
+  memcpy(&context->buffer[j], &data[i], len - i);
+}
+
+void mg_sha1_final(unsigned char digest[20], mg_sha1_ctx *context) {
+  unsigned i;
+  unsigned char finalcount[8], c;
+
+  for (i = 0; i < 8; i++) {
+    finalcount[i] = (unsigned char) ((context->count[(i >= 4 ? 0 : 1)] >>
+                                      ((3 - (i & 3)) * 8)) &
+                                     255);
+  }
+  c = 0200;
+  mg_sha1_update(context, &c, 1);
+  while ((context->count[0] & 504) != 448) {
+    c = 0000;
+    mg_sha1_update(context, &c, 1);
+  }
+  mg_sha1_update(context, finalcount, 8);
+  for (i = 0; i < 20; i++) {
+    digest[i] =
+        (unsigned char) ((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
+  }
+  memset(context, '\0', sizeof(*context));
+  memset(&finalcount, '\0', sizeof(finalcount));
+}
+
+void mg_hmac_sha1(const unsigned char *key, size_t keylen,
+                  const unsigned char *data, size_t datalen,
+                  unsigned char out[20]) {
+  mg_sha1_ctx ctx;
+  unsigned char buf1[64], buf2[64], tmp_key[20], i;
+
+  if (keylen > sizeof(buf1)) {
+    mg_sha1_init(&ctx);
+    mg_sha1_update(&ctx, key, keylen);
+    mg_sha1_final(tmp_key, &ctx);
+    key = tmp_key;
+    keylen = sizeof(tmp_key);
+  }
+
+  memset(buf1, 0, sizeof(buf1));
+  memset(buf2, 0, sizeof(buf2));
+  memcpy(buf1, key, keylen);
+  memcpy(buf2, key, keylen);
+
+  for (i = 0; i < sizeof(buf1); i++) {
+    buf1[i] ^= 0x36;
+    buf2[i] ^= 0x5c;
+  }
+
+  mg_sha1_init(&ctx);
+  mg_sha1_update(&ctx, buf1, sizeof(buf1));
+  mg_sha1_update(&ctx, data, datalen);
+  mg_sha1_final(out, &ctx);
+
+  mg_sha1_init(&ctx);
+  mg_sha1_update(&ctx, buf2, sizeof(buf2));
+  mg_sha1_update(&ctx, out, 20);
+  mg_sha1_final(out, &ctx);
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/sntp.c"
+#endif
+
+
+
+
+
+
+#define SNTP_INTERVAL_SEC (3600)
+#define SNTP_TIME_OFFSET 2208988800UL
+
+static unsigned long s_sntmp_next;
+
+int mg_sntp_parse(const unsigned char *buf, size_t len, struct timeval *tv) {
+  int mode = len > 0 ? buf[0] & 7 : 0, res = -1;
+  if (len < 48) {
+    LOG(LL_ERROR, ("%s", "corrupt packet"));
+  } else if ((buf[0] & 0x38) >> 3 != 4) {
+    LOG(LL_ERROR, ("%s", "wrong version"));
+  } else if (mode != 4 && mode != 5) {
+    LOG(LL_ERROR, ("%s", "not a server reply"));
+  } else if (buf[1] == 0) {
+    LOG(LL_ERROR, ("%s", "server sent a kiss of death"));
+  } else {
+    uint32_t *data = (uint32_t *) &buf[40];
+    tv->tv_sec = (time_t) (mg_ntohl(data[0]) - SNTP_TIME_OFFSET);
+    tv->tv_usec = (suseconds_t) mg_ntohl(data[1]);
+    s_sntmp_next = (unsigned long) (tv->tv_sec + SNTP_INTERVAL_SEC);
+    res = 0;
+  }
+  return res;
+}
+
+static void sntp_cb(struct mg_connection *c, int ev, void *evd, void *fnd) {
+  if (ev == MG_EV_READ) {
+    struct timeval tv = {0, 0};
+    if (mg_sntp_parse(c->recv.buf, c->recv.len, &tv) == 0) {
+      mg_call(c, MG_EV_SNTP_TIME, &tv);
+      LOG(LL_DEBUG, ("%u.%u, next at %lu", (unsigned) tv.tv_sec,
+                     (unsigned) tv.tv_usec, s_sntmp_next));
+    }
+    c->recv.len = 0;  // Clear receive buffer
+  } else if (ev == MG_EV_CONNECT) {
+    mg_sntp_send(c, (unsigned long) time(NULL));
+  } else if (ev == MG_EV_CLOSE) {
+  }
+  (void) fnd;
+  (void) evd;
+}
+
+void mg_sntp_send(struct mg_connection *c, unsigned long utc) {
+  if (c->is_resolving) {
+    LOG(LL_ERROR, ("%lu wait until resolved", c->id));
+  } else if (utc > s_sntmp_next) {
+    uint8_t buf[48] = {0};
+    s_sntmp_next = utc + SNTP_INTERVAL_SEC;
+    buf[0] = (0 << 6) | (4 << 3) | 3;
+    mg_send(c, buf, sizeof(buf));
+    LOG(LL_DEBUG, ("%lu ct %lu, next at %lu", c->id, utc, s_sntmp_next));
+  }
+}
+
+struct mg_connection *mg_sntp_connect(struct mg_mgr *mgr, const char *url,
+                                      mg_event_handler_t fn, void *fnd) {
+  struct mg_connection *c = NULL;
+  if (url == NULL) url = "udp://time.google.com:123";
+  if ((c = mg_connect(mgr, url, fn, fnd)) != NULL) c->pfn = sntp_cb;
+  return c;
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/sock.c"
+#endif
+
+
+
+
+
+
+
+
+
+
+#if MG_ENABLE_SOCKET
+#if defined(_WIN32) && MG_ENABLE_WINSOCK
+#define MG_SOCK_ERRNO WSAGetLastError()
+#ifndef SO_EXCLUSIVEADDRUSE
+#define SO_EXCLUSIVEADDRUSE ((int) (~SO_REUSEADDR))
+#endif
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP
+#define MG_SOCK_ERRNO errno
+typedef Socket_t SOCKET;
+#define INVALID_SOCKET FREERTOS_INVALID_SOCKET
+#else
+#define MG_SOCK_ERRNO errno
+#ifndef closesocket
+#define closesocket(x) close(x)
+#endif
+#define INVALID_SOCKET (-1)
+typedef int SOCKET;
+#endif
+
+#define FD(c_) ((SOCKET) (size_t) (c_)->fd)
+#define S2PTR(s_) ((void *) (size_t) (s_))
+
+#ifndef MSG_NONBLOCKING
+#define MSG_NONBLOCKING 0
+#endif
+
+#ifndef AF_INET6
+#define AF_INET6 10
+#endif
+
+union usa {
+  struct sockaddr sa;
+  struct sockaddr_in sin;
+#if MG_ENABLE_IPV6
+  struct sockaddr_in6 sin6;
+#endif
+};
+
+static socklen_t tousa(struct mg_addr *a, union usa *usa) {
+  socklen_t len = sizeof(usa->sin);
+  memset(usa, 0, sizeof(*usa));
+  usa->sin.sin_family = AF_INET;
+  usa->sin.sin_port = a->port;
+  *(uint32_t *) &usa->sin.sin_addr = a->ip;
+#if MG_ENABLE_IPV6
+  if (a->is_ip6) {
+    usa->sin.sin_family = AF_INET6;
+    usa->sin6.sin6_port = a->port;
+    memcpy(&usa->sin6.sin6_addr, a->ip6, sizeof(a->ip6));
+    len = sizeof(usa->sin6);
+  }
+#endif
+  return len;
+}
+
+static void tomgaddr(union usa *usa, struct mg_addr *a, bool is_ip6) {
+  a->is_ip6 = is_ip6;
+  a->port = usa->sin.sin_port;
+  memcpy(&a->ip, &usa->sin.sin_addr, sizeof(a->ip));
+#if MG_ENABLE_IPV6
+  if (is_ip6) {
+    memcpy(a->ip6, &usa->sin6.sin6_addr, sizeof(a->ip6));
+    a->port = usa->sin6.sin6_port;
+  }
+#endif
+}
+
+static bool mg_sock_would_block(void) {
+  int err = MG_SOCK_ERRNO;
+  return err == EINPROGRESS || err == EWOULDBLOCK
+#ifndef WINCE
+         || err == EAGAIN || err == EINTR
+#endif
+#if defined(_WIN32) && MG_ENABLE_WINSOCK
+         || err == WSAEINTR || err == WSAEWOULDBLOCK
+#endif
+      ;
+}
+
+static struct mg_connection *alloc_conn(struct mg_mgr *mgr, bool is_client,
+                                        SOCKET fd) {
+  struct mg_connection *c = (struct mg_connection *) calloc(1, sizeof(*c));
+  if (c != NULL) {
+    c->is_client = is_client;
+    c->fd = S2PTR(fd);
+    c->mgr = mgr;
+    c->id = ++mgr->nextid;
+  }
+  return c;
+}
+
+static long mg_sock_send(struct mg_connection *c, const void *buf, size_t len) {
+  long n;
+#if !defined(__APPLE__)
+  // See #1338, #1382. On Windows, UDP send() can fail despite connected.
+  // Use sendto() instead. But not on Mac - we'll get EISCONN
+  if (c->is_udp) {
+    union usa usa;
+    socklen_t slen = tousa(&c->peer, &usa);
+    n = sendto(FD(c), (char *) buf, len, 0, &usa.sa, slen);
+  } else
+#endif
+  {
+    n = send(FD(c), (char *) buf, len, MSG_NONBLOCKING);
+  }
+  return n == 0 ? -1 : n < 0 && mg_sock_would_block() ? 0 : n;
+}
+
+bool mg_send(struct mg_connection *c, const void *buf, size_t len) {
+  return c->is_udp ? mg_sock_send(c, buf, len) > 0
+                   : mg_iobuf_add(&c->send, c->send.len, buf, len, MG_IO_SIZE);
+}
+
+static void mg_set_non_blocking_mode(SOCKET fd) {
+#if defined(_WIN32) && MG_ENABLE_WINSOCK
+  unsigned long on = 1;
+  ioctlsocket(fd, FIONBIO, &on);
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP
+  const BaseType_t off = 0;
+  setsockopt(fd, 0, FREERTOS_SO_RCVTIMEO, &off, sizeof(off));
+  setsockopt(fd, 0, FREERTOS_SO_SNDTIMEO, &off, sizeof(off));
+#elif MG_ARCH == MG_ARCH_FREERTOS_LWIP
+  lwip_fcntl(fd, F_SETFL, O_NONBLOCK);
+#elif MG_ARCH == MG_ARCH_AZURERTOS
+  fcntl(fd, F_SETFL, O_NONBLOCK);
+#else
+  fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);  // Set non-blocking mode
+  fcntl(fd, F_SETFD, FD_CLOEXEC);                       // Set close-on-exec
+#endif
+}
+
+static SOCKET mg_open_listener(const char *url, struct mg_addr *addr) {
+  SOCKET fd = INVALID_SOCKET;
+  int s_err = 0;  // Memoized socket error, in case closesocket() overrides it
+  memset(addr, 0, sizeof(*addr));
+  addr->port = mg_htons(mg_url_port(url));
+  if (!mg_aton(mg_url_host(url), addr)) {
+    LOG(LL_ERROR, ("invalid listening URL: %s", url));
+  } else {
+    union usa usa;
+    socklen_t slen = tousa(addr, &usa);
+    int on = 1, af = addr->is_ip6 ? AF_INET6 : AF_INET;
+    int type = strncmp(url, "udp:", 4) == 0 ? SOCK_DGRAM : SOCK_STREAM;
+    int proto = type == SOCK_DGRAM ? IPPROTO_UDP : IPPROTO_TCP;
+    (void) on;
+
+    if ((fd = socket(af, type, proto)) != INVALID_SOCKET &&
+#if (!defined(_WIN32) || !defined(SO_EXCLUSIVEADDRUSE)) && \
+    (!defined(LWIP_SOCKET) || (defined(LWIP_SOCKET) && SO_REUSE == 1))
+        // 1. SO_RESUSEADDR is not enabled on Windows because the semantics of
+        //    SO_REUSEADDR on UNIX and Windows is different. On Windows,
+        //    SO_REUSEADDR allows to bind a socket to a port without error even
+        //    if the port is already open by another program. This is not the
+        //    behavior SO_REUSEADDR was designed for, and leads to hard-to-track
+        //    failure scenarios. Therefore, SO_REUSEADDR was disabled on Windows
+        //    unless SO_EXCLUSIVEADDRUSE is supported and set on a socket.
+        // 2. In case of LWIP, SO_REUSEADDR should be explicitly enabled, by
+        // defining
+        //    SO_REUSE (in lwipopts.h), otherwise the code below will compile
+        //    but won't work! (setsockopt will return EINVAL)
+        !setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof(on)) &&
+#endif
+#if defined(_WIN32) && defined(SO_EXCLUSIVEADDRUSE) && !defined(WINCE)
+        // "Using SO_REUSEADDR and SO_EXCLUSIVEADDRUSE"
+        //! setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *) &on, sizeof(on))
+        //! &&
+        !setsockopt(fd, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (char *) &on,
+                    sizeof(on)) &&
+#endif
+        bind(fd, &usa.sa, slen) == 0 &&
+        // NOTE(lsm): FreeRTOS uses backlog value as a connection limit
+        (type == SOCK_DGRAM || listen(fd, MG_SOCK_LISTEN_BACKLOG_SIZE) == 0)) {
+      // In case port was set to 0, get the real port number
+      if (getsockname(fd, &usa.sa, &slen) == 0) {
+        addr->port = usa.sin.sin_port;
+#if MG_ENABLE_IPV6
+        if (addr->is_ip6) addr->port = usa.sin6.sin6_port;
+#endif
+      }
+      mg_set_non_blocking_mode(fd);
+    } else if (fd != INVALID_SOCKET) {
+      s_err = MG_SOCK_ERRNO;
+      closesocket(fd);
+      fd = INVALID_SOCKET;
+    }
+  }
+  if (fd == INVALID_SOCKET) {
+    if (s_err == 0) s_err = MG_SOCK_ERRNO;
+    LOG(LL_ERROR, ("Failed to listen on %s, errno %d", url, s_err));
+  }
+
+  return fd;
+}
+
+static long mg_sock_recv(struct mg_connection *c, void *buf, size_t len) {
+  long n = 0;
+  if (c->is_udp) {
+    union usa usa;
+    socklen_t slen = tousa(&c->peer, &usa);
+    n = recvfrom(FD(c), (char *) buf, len, 0, &usa.sa, &slen);
+    if (n > 0) tomgaddr(&usa, &c->peer, slen != sizeof(usa.sin));
+  } else {
+    n = recv(FD(c), (char *) buf, len, MSG_NONBLOCKING);
+  }
+  return n == 0 ? -1 : n < 0 && mg_sock_would_block() ? 0 : n;
+}
+
+// NOTE(lsm): do only one iteration of reads, cause some systems
+// (e.g. FreeRTOS stack) return 0 instead of -1/EWOULDBLOCK when no data
+static long read_conn(struct mg_connection *c) {
+  long n = -1;
+  if (c->recv.len >= MG_MAX_RECV_BUF_SIZE) {
+    mg_error(c, "max_recv_buf_size reached");
+  } else if (c->recv.size - c->recv.len < MG_IO_SIZE &&
+             !mg_iobuf_resize(&c->recv, c->recv.size + MG_IO_SIZE)) {
+    mg_error(c, "oom");
+  } else {
+    char *buf = (char *) &c->recv.buf[c->recv.len];
+    size_t len = c->recv.size - c->recv.len;
+    n = c->is_tls ? mg_tls_recv(c, buf, len) : mg_sock_recv(c, buf, len);
+    LOG(n > 0 ? LL_VERBOSE_DEBUG : LL_DEBUG,
+        ("%-3lu %d%d%d%d%d%d%d%d%d%d%d%d%d%d %7ld %ld/%ld err %d", c->id,
+         c->is_listening, c->is_client, c->is_accepted, c->is_resolving,
+         c->is_connecting, c->is_tls, c->is_tls_hs, c->is_udp, c->is_websocket,
+         c->is_hexdumping, c->is_draining, c->is_closing, c->is_readable,
+         c->is_writable, (long) c->recv.len, n, (long) len, MG_SOCK_ERRNO));
+    if (n == 0) {
+      // Do nothing
+    } else if (n < 0) {
+      c->is_closing = 1;  // Error, or normal termination
+    } else if (n > 0) {
+      struct mg_str evd = mg_str_n(buf, (size_t) n);
+      if (c->is_hexdumping) {
+        char *s = mg_hexdump(buf, (size_t) n);
+        LOG(LL_INFO, ("\n-- %lu %s %s %ld\n%s", c->id, c->label, "<-", n, s));
+        free(s);
+      }
+      c->recv.len += (size_t) n;
+      mg_call(c, MG_EV_READ, &evd);
+    }
+  }
+  return n;
+}
+
+static void write_conn(struct mg_connection *c) {
+  char *buf = (char *) c->send.buf;
+  size_t len = c->send.len;
+  long n = c->is_tls ? mg_tls_send(c, buf, len) : mg_sock_send(c, buf, len);
+
+  LOG(n > 0 ? LL_VERBOSE_DEBUG : LL_DEBUG,
+      ("%-3lu %d%d%d%d%d%d%d%d%d%d%d%d%d%d %7ld %ld err %d", c->id,
+       c->is_listening, c->is_client, c->is_accepted, c->is_resolving,
+       c->is_connecting, c->is_tls, c->is_tls_hs, c->is_udp, c->is_websocket,
+       c->is_hexdumping, c->is_draining, c->is_closing, c->is_readable,
+       c->is_writable, (long) c->send.len, n, MG_SOCK_ERRNO));
+
+  if (n == 0) {
+    // Do nothing
+  } else if (n < 0) {
+    c->is_closing = 1;  // Error, or normal termination
+  } else if (n > 0) {
+    // Hexdump before deleting
+    if (c->is_hexdumping) {
+      char *s = mg_hexdump(buf, (size_t) n);
+      LOG(LL_INFO, ("\n-- %lu %s %s %ld\n%s", c->id, c->label, "<-", n, s));
+      free(s);
+    }
+    mg_iobuf_del(&c->send, 0, (size_t) n);
+    if (c->send.len == 0) mg_iobuf_resize(&c->send, 0);
+    mg_call(c, MG_EV_WRITE, &n);
+    // if (c->send.len == 0) mg_iobuf_resize(&c->send, 0);
+  }
+}
+
+static void close_conn(struct mg_connection *c) {
+  mg_resolve_cancel(c);  // Close any pending DNS query
+  LIST_DELETE(struct mg_connection, &c->mgr->conns, c);
+  if (c == c->mgr->dns4.c) c->mgr->dns4.c = NULL;
+  if (c == c->mgr->dns6.c) c->mgr->dns6.c = NULL;
+  // Order of operations is important. `MG_EV_CLOSE` event must be fired
+  // before we deallocate received data, see #1331
+  mg_call(c, MG_EV_CLOSE, NULL);
+  LOG(LL_DEBUG, ("%lu closed", c->id));
+  if (FD(c) != INVALID_SOCKET) {
+    closesocket(FD(c));
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
+    FreeRTOS_FD_CLR(c->fd, c->mgr->ss, eSELECT_ALL);
+#endif
+    c->fd = S2PTR(INVALID_SOCKET);
+  }
+  mg_tls_free(c);
+  mg_iobuf_free(&c->recv);
+  mg_iobuf_free(&c->send);
+  memset(c, 0, sizeof(*c));
+  free(c);
+}
+
+static void setsockopts(struct mg_connection *c) {
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP || MG_ARCH == MG_ARCH_AZURERTOS
+  (void) c;
+#else
+  int on = 1;
+#if !defined(SOL_TCP)
+#define SOL_TCP IPPROTO_TCP
+#endif
+  setsockopt(FD(c), SOL_TCP, TCP_NODELAY, (char *) &on, sizeof(on));
+#if defined(TCP_QUICKACK)
+  setsockopt(FD(c), SOL_TCP, TCP_QUICKACK, (char *) &on, sizeof(on));
+#endif
+  setsockopt(FD(c), SOL_SOCKET, SO_KEEPALIVE, (char *) &on, sizeof(on));
+#if (defined(ESP32) && ESP32) || (defined(ESP8266) && ESP8266) || \
+    defined(__linux__)
+  int idle = 60;
+  setsockopt(FD(c), IPPROTO_TCP, TCP_KEEPIDLE, &idle, sizeof(idle));
+#endif
+#if !defined(_WIN32) && !defined(__QNX__)
+  {
+    int cnt = 3, intvl = 20;
+    setsockopt(FD(c), IPPROTO_TCP, TCP_KEEPCNT, &cnt, sizeof(cnt));
+    setsockopt(FD(c), IPPROTO_TCP, TCP_KEEPINTVL, &intvl, sizeof(intvl));
+  }
+#endif
+#endif
+}
+
+void mg_connect_resolved(struct mg_connection *c) {
+  char buf[40];
+  int type = c->is_udp ? SOCK_DGRAM : SOCK_STREAM;
+  int rc, af = c->peer.is_ip6 ? AF_INET6 : AF_INET;
+  mg_straddr(c, buf, sizeof(buf));
+  c->fd = S2PTR(socket(af, type, 0));
+  if (FD(c) == INVALID_SOCKET) {
+    mg_error(c, "socket(): %d", MG_SOCK_ERRNO);
+  } else {
+    union usa usa;
+    socklen_t slen = tousa(&c->peer, &usa);
+    if (c->is_udp == 0) mg_set_non_blocking_mode(FD(c));
+    if (c->is_udp == 0) setsockopts(c);
+    mg_call(c, MG_EV_RESOLVE, NULL);
+    if ((rc = connect(FD(c), &usa.sa, slen)) == 0) {
+      mg_call(c, MG_EV_CONNECT, NULL);
+    } else if (mg_sock_would_block()) {
+      c->is_connecting = 1;
+    } else {
+      mg_error(c, "connect: %d", MG_SOCK_ERRNO);
+    }
+  }
+}
+
+struct mg_connection *mg_connect(struct mg_mgr *mgr, const char *url,
+                                 mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = NULL;
+  if ((c = alloc_conn(mgr, 1, INVALID_SOCKET)) == NULL) {
+    LOG(LL_ERROR, ("OOM"));
+  } else {
+    struct mg_str host = mg_url_host(url);
+    LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
+    c->is_udp = (strncmp(url, "udp:", 4) == 0);
+    c->peer.port = mg_htons(mg_url_port(url));
+    c->fn = fn;
+    c->fn_data = fn_data;
+    LOG(LL_DEBUG, ("%lu -> %s", c->id, url));
+    mg_call(c, MG_EV_OPEN, NULL);
+    mg_resolve(c, &host, mgr->dnstimeout);
+  }
+  return c;
+}
+
+static void accept_conn(struct mg_mgr *mgr, struct mg_connection *lsn) {
+  struct mg_connection *c = NULL;
+  union usa usa;
+  socklen_t sa_len = sizeof(usa);
+  SOCKET fd = accept(FD(lsn), &usa.sa, &sa_len);
+  if (fd == INVALID_SOCKET) {
+#if MG_ARCH == MG_ARCH_AZURERTOS
+    // AzureRTOS, in non-block socket mode can mark listening socket readable
+    // even it is not. See comment for 'select' func implementation in nx_bsd.c
+    // That's not an error, just should try later
+    if (MG_SOCK_ERRNO != EAGAIN)
+#endif
+      LOG(LL_ERROR, ("%lu accept failed, errno %d", lsn->id, MG_SOCK_ERRNO));
+#if (!defined(_WIN32) && (MG_ARCH != MG_ARCH_FREERTOS_TCP))
+  } else if ((long) fd >= FD_SETSIZE) {
+    LOG(LL_ERROR, ("%ld > %ld", (long) fd, (long) FD_SETSIZE));
+    closesocket(fd);
+#endif
+  } else if ((c = alloc_conn(mgr, 0, fd)) == NULL) {
+    LOG(LL_ERROR, ("%lu OOM", lsn->id));
+    closesocket(fd);
+  } else {
+    char buf[40];
+    tomgaddr(&usa, &c->peer, sa_len != sizeof(usa.sin));
+    mg_straddr(c, buf, sizeof(buf));
+    LOG(LL_DEBUG, ("%lu accepted %s", c->id, buf));
+    mg_set_non_blocking_mode(FD(c));
+    setsockopts(c);
+    LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
+    c->is_accepted = 1;
+    c->is_hexdumping = lsn->is_hexdumping;
+    c->pfn = lsn->pfn;
+    c->pfn_data = lsn->pfn_data;
+    c->fn = lsn->fn;
+    c->fn_data = lsn->fn_data;
+    mg_call(c, MG_EV_OPEN, NULL);
+    mg_call(c, MG_EV_ACCEPT, NULL);
+  }
+}
+
+static bool mg_socketpair(SOCKET sp[2], union usa usa[2]) {
+  socklen_t n = sizeof(usa[0].sin);
+  bool result = false;
+
+  (void) memset(&usa[0], 0, sizeof(usa[0]));
+  usa[0].sin.sin_family = AF_INET;
+  *(uint32_t *) &usa->sin.sin_addr = mg_htonl(0x7f000001);  // 127.0.0.1
+  usa[1] = usa[0];
+
+  if ((sp[0] = socket(AF_INET, SOCK_DGRAM, 0)) != INVALID_SOCKET &&
+      (sp[1] = socket(AF_INET, SOCK_DGRAM, 0)) != INVALID_SOCKET &&
+      bind(sp[0], &usa[0].sa, n) == 0 && bind(sp[1], &usa[1].sa, n) == 0 &&
+      getsockname(sp[0], &usa[0].sa, &n) == 0 &&
+      getsockname(sp[1], &usa[1].sa, &n) == 0 &&
+      connect(sp[0], &usa[1].sa, n) == 0 &&
+      connect(sp[1], &usa[0].sa, n) == 0) {
+    mg_set_non_blocking_mode(sp[1]);  // Set close-on-exec
+    result = true;
+  } else {
+    if (sp[0] != INVALID_SOCKET) closesocket(sp[0]);
+    if (sp[1] != INVALID_SOCKET) closesocket(sp[1]);
+    sp[0] = sp[1] = INVALID_SOCKET;
+  }
+
+  return result;
+}
+
+void mg_mgr_wakeup(struct mg_connection *c) {
+  LOG(LL_INFO, ("skt: %p", c->pfn_data));
+  send((SOCKET) (size_t) c->pfn_data, "\x01", 1, MSG_NONBLOCKING);
+}
+
+static void pf1(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_READ) mg_iobuf_free(&c->recv);
+  (void) ev_data, (void) fn_data;
+}
+
+struct mg_connection *mg_mkpipe(struct mg_mgr *mgr, mg_event_handler_t fn,
+                                void *fn_data) {
+  union usa usa[2];
+  SOCKET sp[2] = {INVALID_SOCKET, INVALID_SOCKET};
+  struct mg_connection *c = NULL;
+  if (!mg_socketpair(sp, usa)) {
+    LOG(LL_ERROR, ("Cannot create socket pair"));
+  } else if ((c = alloc_conn(mgr, false, sp[1])) == NULL) {
+    closesocket(sp[0]);
+    closesocket(sp[1]);
+    LOG(LL_ERROR, ("OOM"));
+  } else {
+    LOG(LL_INFO, ("pipe %lu", (unsigned long) sp[0]));
+    tomgaddr(&usa[0], &c->peer, false);
+    c->is_udp = 1;
+    c->pfn = pf1;
+    c->pfn_data = (void *) (size_t) sp[0];
+    c->fn = fn;
+    c->fn_data = fn_data;
+    mg_call(c, MG_EV_OPEN, NULL);
+    LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
+  }
+  return c;
+}
+
+struct mg_connection *mg_listen(struct mg_mgr *mgr, const char *url,
+                                mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = NULL;
+  bool is_udp = strncmp(url, "udp:", 4) == 0;
+  struct mg_addr addr;
+  SOCKET fd = mg_open_listener(url, &addr);
+  if (fd == INVALID_SOCKET) {
+    LOG(LL_ERROR, ("Failed: %s, errno %d", url, MG_SOCK_ERRNO));
+  } else if ((c = alloc_conn(mgr, 0, fd)) == NULL) {
+    LOG(LL_ERROR, ("OOM %s", url));
+    closesocket(fd);
+  } else {
+    memcpy(&c->peer, &addr, sizeof(struct mg_addr));
+    c->fd = S2PTR(fd);
+    c->is_listening = 1;
+    c->is_udp = is_udp;
+    LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
+    c->fn = fn;
+    c->fn_data = fn_data;
+    mg_call(c, MG_EV_OPEN, NULL);
+    LOG(LL_DEBUG,
+        ("%lu accepting on %s (port %u)", c->id, url, mg_ntohs(c->peer.port)));
+  }
+  return c;
+}
+
+static void mg_iotest(struct mg_mgr *mgr, int ms) {
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
+  struct mg_connection *c;
+  for (c = mgr->conns; c != NULL; c = c->next) {
+    if (c->is_closing || c->is_resolving || FD(c) == INVALID_SOCKET) continue;
+    FreeRTOS_FD_SET(c->fd, mgr->ss, eSELECT_READ | eSELECT_EXCEPT);
+    if (c->is_connecting || (c->send.len > 0 && c->is_tls_hs == 0))
+      FreeRTOS_FD_SET(c->fd, mgr->ss, eSELECT_WRITE);
+  }
+  FreeRTOS_select(mgr->ss, pdMS_TO_TICKS(ms));
+  for (c = mgr->conns; c != NULL; c = c->next) {
+    EventBits_t bits = FreeRTOS_FD_ISSET(c->fd, mgr->ss);
+    c->is_readable = bits & (eSELECT_READ | eSELECT_EXCEPT) ? 1 : 0;
+    c->is_writable = bits & eSELECT_WRITE ? 1 : 0;
+    FreeRTOS_FD_CLR(c->fd, mgr->ss,
+                    eSELECT_READ | eSELECT_EXCEPT | eSELECT_WRITE);
+  }
+#else
+  struct timeval tv = {ms / 1000, (ms % 1000) * 1000};
+  struct mg_connection *c;
+  fd_set rset, wset;
+  SOCKET maxfd = 0;
+  int rc;
+
+  FD_ZERO(&rset);
+  FD_ZERO(&wset);
+
+  for (c = mgr->conns; c != NULL; c = c->next) {
+    if (c->is_closing || c->is_resolving || FD(c) == INVALID_SOCKET) continue;
+    FD_SET(FD(c), &rset);
+    if (FD(c) > maxfd) maxfd = FD(c);
+    if (c->is_connecting || (c->send.len > 0 && c->is_tls_hs == 0))
+      FD_SET(FD(c), &wset);
+  }
+
+  if ((rc = select((int) maxfd + 1, &rset, &wset, NULL, &tv)) < 0) {
+    LOG(LL_DEBUG, ("select: %d %d", rc, MG_SOCK_ERRNO));
+    FD_ZERO(&rset);
+    FD_ZERO(&wset);
+  }
+
+  for (c = mgr->conns; c != NULL; c = c->next) {
+    // TLS might have stuff buffered, so dig everything
+    c->is_readable = FD(c) != INVALID_SOCKET && FD_ISSET(FD(c), &rset);
+    c->is_writable = FD(c) != INVALID_SOCKET && FD_ISSET(FD(c), &wset);
+  }
+#endif
+}
+
+static void connect_conn(struct mg_connection *c) {
+  int rc = 0;
+#if MG_ARCH != MG_ARCH_FREERTOS_TCP
+  socklen_t len = sizeof(rc);
+  if (getsockopt(FD(c), SOL_SOCKET, SO_ERROR, (char *) &rc, &len)) rc = 1;
+#endif
+  if (rc == EAGAIN || rc == EWOULDBLOCK) rc = 0;
+  c->is_connecting = 0;
+  if (rc) {
+    char buf[40];
+    mg_error(c, "error connecting to %s", mg_straddr(c, buf, sizeof(buf)));
+  } else {
+    if (c->is_tls_hs) mg_tls_handshake(c);
+    mg_call(c, MG_EV_CONNECT, NULL);
+  }
+}
+
+void mg_mgr_poll(struct mg_mgr *mgr, int ms) {
+  struct mg_connection *c, *tmp;
+  unsigned long now;
+
+  mg_iotest(mgr, ms);
+  now = mg_millis();
+  mg_timer_poll(now);
+
+  for (c = mgr->conns; c != NULL; c = tmp) {
+    tmp = c->next;
+    mg_call(c, MG_EV_POLL, &now);
+    LOG(LL_VERBOSE_DEBUG,
+        ("%lu %c%c %c%c%c%c%c", c->id, c->is_readable ? 'r' : '-',
+         c->is_writable ? 'w' : '-', c->is_tls ? 'T' : 't',
+         c->is_connecting ? 'C' : 'c', c->is_tls_hs ? 'H' : 'h',
+         c->is_resolving ? 'R' : 'r', c->is_closing ? 'C' : 'c'));
+    if (c->is_resolving || c->is_closing) {
+      // Do nothing
+    } else if (c->is_listening && c->is_udp == 0) {
+      if (c->is_readable) accept_conn(mgr, c);
+    } else if (c->is_connecting) {
+      if (c->is_readable || c->is_writable) connect_conn(c);
+    } else if (c->is_tls_hs) {
+      if ((c->is_readable || c->is_writable)) mg_tls_handshake(c);
+    } else {
+      if (c->is_readable) read_conn(c);
+      if (c->is_writable) write_conn(c);
+      while (c->is_tls && read_conn(c) > 0) (void) 0;  // Read buffered TLS data
+    }
+
+    if (c->is_draining && c->send.len == 0) c->is_closing = 1;
+    if (c->is_closing) close_conn(c);
+  }
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/ssi.c"
+#endif
+
+
+
+
+#ifndef MG_MAX_SSI_DEPTH
+#define MG_MAX_SSI_DEPTH 5
+#endif
+
+#if MG_ENABLE_SSI
+static char *mg_ssi(const char *path, const char *root, int depth) {
+  struct mg_iobuf b = {NULL, 0, 0};
+  FILE *fp = fopen(path, "rb");
+  if (fp != NULL) {
+    char buf[BUFSIZ], arg[sizeof(buf)];
+    int ch, intag = 0;
+    size_t len = 0, align = MG_IO_SIZE;
+    while ((ch = fgetc(fp)) != EOF) {
+      if (intag && ch == '>' && buf[len - 1] == '-' && buf[len - 2] == '-') {
+        buf[len++] = (char) (ch & 0xff);
+        if (sscanf(buf, "<!--#include file=\"%[^\"]", arg)) {
+          char tmp[MG_PATH_MAX + BUFSIZ + 10],
+              *p = (char *) path + strlen(path), *data;
+          while (p > path && p[-1] != MG_DIRSEP && p[-1] != '/') p--;
+          snprintf(tmp, sizeof(tmp), "%.*s%s", (int) (p - path), path, arg);
+          if (depth < MG_MAX_SSI_DEPTH &&
+              (data = mg_ssi(tmp, root, depth + 1)) != NULL) {
+            mg_iobuf_add(&b, b.len, data, strlen(data), align);
+            free(data);
+          } else {
+            LOG(LL_ERROR, ("%s: file=%s error or too deep", path, arg));
+          }
+        } else if (sscanf(buf, "<!--#include virtual=\"%[^\"]", arg)) {
+          char tmp[MG_PATH_MAX + BUFSIZ + 10], *data;
+          snprintf(tmp, sizeof(tmp), "%s%s", root, arg);
+          if (depth < MG_MAX_SSI_DEPTH &&
+              (data = mg_ssi(tmp, root, depth + 1)) != NULL) {
+            mg_iobuf_add(&b, b.len, data, strlen(data), align);
+            free(data);
+          } else {
+            LOG(LL_ERROR, ("%s: virtual=%s error or too deep", path, arg));
+          }
+        } else {
+          // Unknown SSI tag
+          LOG(LL_INFO, ("Unknown SSI tag: %.*s", (int) len, buf));
+          mg_iobuf_add(&b, b.len, buf, len, align);
+        }
+        intag = 0;
+        len = 0;
+      } else if (ch == '<') {
+        intag = 1;
+        if (len > 0) mg_iobuf_add(&b, b.len, buf, len, align);
+        len = 0;
+        buf[len++] = (char) (ch & 0xff);
+      } else if (intag) {
+        if (len == 5 && strncmp(buf, "<!--#", 5) != 0) {
+          intag = 0;
+        } else if (len >= sizeof(buf) - 2) {
+          LOG(LL_ERROR, ("%s: SSI tag is too large", path));
+          len = 0;
+        }
+        buf[len++] = (char) (ch & 0xff);
+      } else {
+        buf[len++] = (char) (ch & 0xff);
+        if (len >= sizeof(buf)) {
+          mg_iobuf_add(&b, b.len, buf, len, align);
+          len = 0;
+        }
+      }
+    }
+    if (len > 0) mg_iobuf_add(&b, b.len, buf, len, align);
+    if (b.len > 0) mg_iobuf_add(&b, b.len, "", 1, align);  // nul-terminate
+    fclose(fp);
+  }
+  (void) depth;
+  (void) root;
+  return (char *) b.buf;
+}
+
+void mg_http_serve_ssi(struct mg_connection *c, const char *root,
+                       const char *fullpath) {
+  const char *headers = "Content-Type: text/html; charset=utf-8\r\n";
+  char *data = mg_ssi(fullpath, root, 0);
+  mg_http_reply(c, 200, headers, "%s", data == NULL ? "" : data);
+  free(data);
+}
+#else
+void mg_http_serve_ssi(struct mg_connection *c, const char *root,
+                       const char *fullpath) {
+  mg_http_reply(c, 501, NULL, "SSI not enabled");
+  (void) root, (void) fullpath;
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/str.c"
+#endif
+
+#include <stdlib.h>
+
+struct mg_str mg_str_s(const char *s) {
+  struct mg_str str = {s, s == NULL ? 0 : strlen(s)};
+  return str;
+}
+
+struct mg_str mg_str_n(const char *s, size_t n) {
+  struct mg_str str = {s, n};
+  return str;
+}
+
+int mg_lower(const char *s) {
+  return tolower(*(const unsigned char *) s);
+}
+
+int mg_ncasecmp(const char *s1, const char *s2, size_t len) {
+  int diff = 0;
+  if (len > 0) do {
+      diff = mg_lower(s1++) - mg_lower(s2++);
+    } while (diff == 0 && s1[-1] != '\0' && --len > 0);
+  return diff;
+}
+
+int mg_casecmp(const char *s1, const char *s2) {
+  return mg_ncasecmp(s1, s2, (size_t) ~0);
+}
+
+int mg_vcmp(const struct mg_str *s1, const char *s2) {
+  size_t n2 = strlen(s2), n1 = s1->len;
+  int r = strncmp(s1->ptr, s2, (n1 < n2) ? n1 : n2);
+  if (r == 0) return (int) (n1 - n2);
+  return r;
+}
+
+int mg_vcasecmp(const struct mg_str *str1, const char *str2) {
+  size_t n2 = strlen(str2), n1 = str1->len;
+  int r = mg_ncasecmp(str1->ptr, str2, (n1 < n2) ? n1 : n2);
+  if (r == 0) return (int) (n1 - n2);
+  return r;
+}
+
+struct mg_str mg_strdup(const struct mg_str s) {
+  struct mg_str r = {NULL, 0};
+  if (s.len > 0 && s.ptr != NULL) {
+    char *sc = (char *) calloc(1, s.len + 1);
+    if (sc != NULL) {
+      memcpy(sc, s.ptr, s.len);
+      sc[s.len] = '\0';
+      r.ptr = sc;
+      r.len = s.len;
+    }
+  }
+  return r;
+}
+
+int mg_strcmp(const struct mg_str str1, const struct mg_str str2) {
+  size_t i = 0;
+  while (i < str1.len && i < str2.len) {
+    int c1 = str1.ptr[i];
+    int c2 = str2.ptr[i];
+    if (c1 < c2) return -1;
+    if (c1 > c2) return 1;
+    i++;
+  }
+  if (i < str1.len) return 1;
+  if (i < str2.len) return -1;
+  return 0;
+}
+
+const char *mg_strstr(const struct mg_str haystack,
+                      const struct mg_str needle) {
+  size_t i;
+  if (needle.len > haystack.len) return NULL;
+  for (i = 0; i <= haystack.len - needle.len; i++) {
+    if (memcmp(haystack.ptr + i, needle.ptr, needle.len) == 0) {
+      return haystack.ptr + i;
+    }
+  }
+  return NULL;
+}
+
+struct mg_str mg_strstrip(struct mg_str s) {
+  while (s.len > 0 && isspace((int) *s.ptr)) s.ptr++, s.len--;
+  while (s.len > 0 && isspace((int) *(s.ptr + s.len - 1))) s.len--;
+  return s;
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/timer.c"
+#endif
+// Copyright (c) Cesanta Software Limited
+// All rights reserved
+
+
+
+
+struct mg_timer *g_timers;
+
+void mg_timer_init(struct mg_timer *t, unsigned long ms, unsigned flags,
+                   void (*fn)(void *), void *arg) {
+  struct mg_timer tmp = {ms, 0UL, flags, fn, arg, g_timers};
+  *t = tmp;
+  g_timers = t;
+  if (flags & MG_TIMER_RUN_NOW) fn(arg);
+}
+
+void mg_timer_free(struct mg_timer *t) {
+  struct mg_timer **head = &g_timers;
+  while (*head && *head != t) head = &(*head)->next;
+  if (*head) *head = t->next;
+}
+
+void mg_timer_poll(unsigned long now_ms) {
+  // If time goes back (wrapped around), reset timers
+  struct mg_timer *t, *tmp;
+  static unsigned long oldnow;  // Timestamp in a previous invocation
+  if (oldnow > now_ms) {        // If it is wrapped, reset timers
+    for (t = g_timers; t != NULL; t = t->next) t->expire = 0;
+  }
+  oldnow = now_ms;
+
+  for (t = g_timers; t != NULL; t = tmp) {
+    tmp = t->next;
+    if (t->expire == 0) t->expire = now_ms + t->period_ms;
+    if (t->expire > now_ms) continue;
+    t->fn(t->arg);
+    // Try to tick timers with the given period as accurate as possible,
+    // even if this polling function is called with some random period.
+    t->expire = now_ms - t->expire > (unsigned long) t->period_ms
+                    ? now_ms + t->period_ms
+                    : t->expire + t->period_ms;
+    if (!(t->flags & MG_TIMER_REPEAT)) mg_timer_free(t);
+  }
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/tls_dummy.c"
+#endif
+
+
+#if !MG_ENABLE_MBEDTLS && !MG_ENABLE_OPENSSL && !MG_ENABLE_CUSTOM_TLS
+void mg_tls_init(struct mg_connection *c, struct mg_tls_opts *opts) {
+  (void) opts;
+  mg_error(c, "TLS is not enabled");
+}
+void mg_tls_handshake(struct mg_connection *c) {
+  (void) c;
+}
+void mg_tls_free(struct mg_connection *c) {
+  (void) c;
+}
+long mg_tls_recv(struct mg_connection *c, void *buf, size_t len) {
+  return c == NULL || buf == NULL || len == 0 ? 0 : -1;
+}
+long mg_tls_send(struct mg_connection *c, const void *buf, size_t len) {
+  return c == NULL || buf == NULL || len == 0 ? 0 : -1;
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/tls_mbed.c"
+#endif
+
+
+#if MG_ENABLE_MBEDTLS
+void mg_tls_handshake(struct mg_connection *c) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  int rc;
+  mbedtls_ssl_set_bio(&tls->ssl, &c->fd, mbedtls_net_send, mbedtls_net_recv, 0);
+  rc = mbedtls_ssl_handshake(&tls->ssl);
+  if (rc == 0) {  // Success
+    LOG(LL_DEBUG, ("%lu success", c->id));
+    c->is_tls_hs = 0;
+  } else if (rc == MBEDTLS_ERR_SSL_WANT_READ ||
+             rc == MBEDTLS_ERR_SSL_WANT_WRITE) {  // Still pending
+    LOG(LL_VERBOSE_DEBUG, ("%lu pending, %d%d %d (-%#x)", c->id,
+                           c->is_connecting, c->is_tls_hs, rc, -rc));
+  } else {
+    mg_error(c, "TLS handshake: -%#x", -rc);  // Error
+  }
+}
+
+static int mbed_rng(void *ctx, unsigned char *buf, size_t len) {
+  mg_random(buf, len);
+  (void) ctx;
+  return 0;
+}
+
+static void debug_cb(void *c, int lev, const char *s, int n, const char *s2) {
+  n = (int) strlen(s2) - 1;
+  LOG(LL_VERBOSE_DEBUG, ("%p %.*s", ((struct mg_connection *) c)->fd, n, s2));
+  (void) s;
+  (void) c;
+  (void) lev;
+}
+
+#if defined(MBEDTLS_VERSION_NUMBER) && MBEDTLS_VERSION_NUMBER >= 0x03000000
+static int rng_get(void *p_rng, unsigned char *buf, size_t len) {
+  (void) p_rng;
+  mg_random(buf, len);
+  return 0;
+}
+#endif
+
+void mg_tls_init(struct mg_connection *c, struct mg_tls_opts *opts) {
+  struct mg_tls *tls = (struct mg_tls *) calloc(1, sizeof(*tls));
+  int rc = 0;
+  const char *ca = opts->ca == NULL     ? "-"
+                   : opts->ca[0] == '-' ? "(emb)"
+                                        : opts->ca;
+  const char *crl = opts->crl == NULL     ? "-"
+                    : opts->crl[0] == '-' ? "(emb)"
+                                          : opts->crl;
+  const char *cert = opts->cert == NULL     ? "-"
+                     : opts->cert[0] == '-' ? "(emb)"
+                                            : opts->cert;
+  const char *certkey = opts->certkey == NULL     ? "-"
+                        : opts->certkey[0] == '-' ? "(emb)"
+                                                  : opts->certkey;
+  if (tls == NULL) {
+    mg_error(c, "TLS OOM");
+    goto fail;
+  }
+  LOG(LL_DEBUG, ("%lu Setting TLS, CA: %s, CRL: %s, cert: %s, key: %s", c->id,
+                 ca, crl, cert, certkey));
+  mbedtls_ssl_init(&tls->ssl);
+  mbedtls_ssl_config_init(&tls->conf);
+  mbedtls_x509_crt_init(&tls->ca);
+  mbedtls_x509_crl_init(&tls->crl);
+  mbedtls_x509_crt_init(&tls->cert);
+  mbedtls_pk_init(&tls->pk);
+  mbedtls_ssl_conf_dbg(&tls->conf, debug_cb, c);
+  //#if !defined(ESP_PLATFORM)
+  // mbedtls_debug_set_threshold(5);
+  //#endif
+  if ((rc = mbedtls_ssl_config_defaults(
+           &tls->conf,
+           c->is_client ? MBEDTLS_SSL_IS_CLIENT : MBEDTLS_SSL_IS_SERVER,
+           MBEDTLS_SSL_TRANSPORT_STREAM, MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
+    mg_error(c, "tls defaults %#x", -rc);
+    goto fail;
+  }
+  mbedtls_ssl_conf_rng(&tls->conf, mbed_rng, c);
+  if (opts->ca == NULL || strcmp(opts->ca, "*") == 0) {
+    mbedtls_ssl_conf_authmode(&tls->conf, MBEDTLS_SSL_VERIFY_NONE);
+  }
+  if (opts->ca != NULL && opts->ca[0] != '\0') {
+    if (opts->crl != NULL && opts->crl[0] != '\0') {
+      rc = opts->crl[0] == '-'
+               ? mbedtls_x509_crl_parse(&tls->crl, (uint8_t *) opts->crl,
+                                        strlen(opts->crl) + 1)
+               : mbedtls_x509_crl_parse_file(&tls->crl, opts->crl);
+      if (rc != 0) {
+        mg_error(c, "parse(%s) err %#x", crl, -rc);
+        goto fail;
+      }
+    }
+#if defined(MBEDTLS_X509_CA_CHAIN_ON_DISK)
+    tls->cafile = strdup(opts->ca);
+    rc = mbedtls_ssl_conf_ca_chain_file(&tls->conf, tls->cafile, &tls->crl);
+    if (rc != 0) {
+      mg_error(c, "parse on-disk chain(%s) err %#x", ca, -rc);
+      goto fail;
+    }
+#else
+    rc = opts->ca[0] == '-'
+             ? mbedtls_x509_crt_parse(&tls->ca, (uint8_t *) opts->ca,
+                                      strlen(opts->ca) + 1)
+             : mbedtls_x509_crt_parse_file(&tls->ca, opts->ca);
+    if (rc != 0) {
+      mg_error(c, "parse(%s) err %#x", ca, -rc);
+      goto fail;
+    }
+    mbedtls_ssl_conf_ca_chain(&tls->conf, &tls->ca, &tls->crl);
+#endif
+    if (opts->srvname.len > 0) {
+      char mem[128], *buf = mem;
+      mg_asprintf(&buf, sizeof(mem), "%.*s", (int) opts->srvname.len,
+                  opts->srvname.ptr);
+      mbedtls_ssl_set_hostname(&tls->ssl, buf);
+      if (buf != mem) free(buf);
+    }
+    mbedtls_ssl_conf_authmode(&tls->conf, MBEDTLS_SSL_VERIFY_REQUIRED);
+  }
+  if (opts->cert != NULL && opts->cert[0] != '\0') {
+    const char *key = opts->certkey;
+    if (key == NULL) {
+      key = opts->cert;
+      certkey = cert;
+    }
+    rc = opts->cert[0] == '-'
+             ? mbedtls_x509_crt_parse(&tls->cert, (uint8_t *) opts->cert,
+                                      strlen(opts->cert) + 1)
+             : mbedtls_x509_crt_parse_file(&tls->cert, opts->cert);
+    if (rc != 0) {
+      mg_error(c, "parse(%s) err %#x", cert, -rc);
+      goto fail;
+    }
+    rc = key[0] == '-' ? mbedtls_pk_parse_key(&tls->pk, (uint8_t *) key,
+                                              strlen(key) + 1, NULL, 0 RNG)
+                       : mbedtls_pk_parse_keyfile(&tls->pk, key, NULL RNG);
+    if (rc != 0) {
+      mg_error(c, "tls key(%s) %#x", certkey, -rc);
+      goto fail;
+    }
+    rc = mbedtls_ssl_conf_own_cert(&tls->conf, &tls->cert, &tls->pk);
+    if (rc != 0) {
+      mg_error(c, "own cert %#x", -rc);
+      goto fail;
+    }
+  }
+  if ((rc = mbedtls_ssl_setup(&tls->ssl, &tls->conf)) != 0) {
+    mg_error(c, "setup err %#x", -rc);
+    goto fail;
+  }
+  c->tls = tls;
+  c->is_tls = 1;
+  c->is_tls_hs = 1;
+  if (c->is_client && c->is_resolving == 0 && c->is_connecting == 0) {
+    mg_tls_handshake(c);
+  }
+  return;
+fail:
+  c->is_closing = 1;
+  free(tls);
+}
+
+long mg_tls_recv(struct mg_connection *c, void *buf, size_t len) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  long n = mbedtls_ssl_read(&tls->ssl, (unsigned char *) buf, len);
+  return n == 0 ? -1 : n == MBEDTLS_ERR_SSL_WANT_READ ? 0 : n;
+}
+
+long mg_tls_send(struct mg_connection *c, const void *buf, size_t len) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  long n = mbedtls_ssl_write(&tls->ssl, (unsigned char *) buf, len);
+  return n == 0 ? -1 : n == MBEDTLS_ERR_SSL_WANT_WRITE ? 0 : n;
+}
+
+void mg_tls_free(struct mg_connection *c) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  if (tls == NULL) return;
+  free(tls->cafile);
+  mbedtls_ssl_free(&tls->ssl);
+  mbedtls_pk_free(&tls->pk);
+  mbedtls_x509_crt_free(&tls->ca);
+  mbedtls_x509_crl_free(&tls->crl);
+  mbedtls_x509_crt_free(&tls->cert);
+  mbedtls_ssl_config_free(&tls->conf);
+  free(tls);
+  c->tls = NULL;
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/tls_openssl.c"
+#endif
+
+
+#if MG_ENABLE_OPENSSL
+static int mg_tls_err(struct mg_tls *tls, int res) {
+  int err = SSL_get_error(tls->ssl, res);
+  // We've just fetched the last error from the queue.
+  // Now we need to clear the error queue. If we do not, then the following
+  // can happen (actually reported):
+  //  - A new connection is accept()-ed with cert error (e.g. self-signed cert)
+  //  - Since all accept()-ed connections share listener's context,
+  //  - *ALL* SSL accepted connection report read error on the next poll cycle.
+  //    Thus a single errored connection can close all the rest, unrelated ones.
+  // Clearing the error keeps the shared SSL_CTX in an OK state.
+
+  if (err != 0) ERR_print_errors_fp(stderr);
+  ERR_clear_error();
+  if (err == SSL_ERROR_WANT_READ) return 0;
+  if (err == SSL_ERROR_WANT_WRITE) return 0;
+  return err;
+}
+
+void mg_tls_init(struct mg_connection *c, struct mg_tls_opts *opts) {
+  struct mg_tls *tls = (struct mg_tls *) calloc(1, sizeof(*tls));
+  const char *id = "mongoose";
+  static unsigned char s_initialised = 0;
+  int rc;
+
+  if (tls == NULL) {
+    mg_error(c, "TLS OOM");
+    goto fail;
+  }
+
+  if (!s_initialised) {
+    SSL_library_init();
+    s_initialised++;
+  }
+  LOG(LL_DEBUG, ("%lu Setting TLS, CA: %s, cert: %s, key: %s", c->id,
+                 opts->ca == NULL ? "null" : opts->ca,
+                 opts->cert == NULL ? "null" : opts->cert,
+                 opts->certkey == NULL ? "null" : opts->certkey));
+  tls->ctx = c->is_client ? SSL_CTX_new(SSLv23_client_method())
+                          : SSL_CTX_new(SSLv23_server_method());
+  if ((tls->ssl = SSL_new(tls->ctx)) == NULL) {
+    mg_error(c, "SSL_new");
+    goto fail;
+  }
+  SSL_set_session_id_context(tls->ssl, (const uint8_t *) id,
+                             (unsigned) strlen(id));
+  // Disable deprecated protocols
+  SSL_set_options(tls->ssl, SSL_OP_NO_SSLv2);
+  SSL_set_options(tls->ssl, SSL_OP_NO_SSLv3);
+  SSL_set_options(tls->ssl, SSL_OP_NO_TLSv1);
+  SSL_set_options(tls->ssl, SSL_OP_NO_TLSv1_1);
+#ifdef MG_ENABLE_OPENSSL_NO_COMPRESSION
+  SSL_set_options(tls->ssl, SSL_OP_NO_COMPRESSION);
+#endif
+#ifdef MG_ENABLE_OPENSSL_CIPHER_SERVER_PREFERENCE
+  SSL_set_options(tls->ssl, SSL_OP_CIPHER_SERVER_PREFERENCE);
+#endif
+
+  if (opts->ca != NULL && opts->ca[0] != '\0') {
+    SSL_set_verify(tls->ssl, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
+                   NULL);
+    if ((rc = SSL_CTX_load_verify_locations(tls->ctx, opts->ca, NULL)) != 1) {
+      mg_error(c, "parse(%s): err %d", opts->ca, mg_tls_err(tls, rc));
+      goto fail;
+    }
+  }
+  if (opts->cert != NULL && opts->cert[0] != '\0') {
+    const char *key = opts->certkey;
+    if (key == NULL) key = opts->cert;
+    if ((rc = SSL_use_certificate_file(tls->ssl, opts->cert, 1)) != 1) {
+      mg_error(c, "Invalid SSL cert, err %d", mg_tls_err(tls, rc));
+      goto fail;
+    } else if ((rc = SSL_use_PrivateKey_file(tls->ssl, key, 1)) != 1) {
+      mg_error(c, "Invalid SSL key, err %d", mg_tls_err(tls, rc));
+      goto fail;
+#if OPENSSL_VERSION_NUMBER > 0x10100000L
+    } else if ((rc = SSL_use_certificate_chain_file(tls->ssl, opts->cert)) !=
+               1) {
+      mg_error(c, "Invalid CA, err %d", mg_tls_err(tls, rc));
+      goto fail;
+#endif
+    } else {
+      SSL_set_mode(tls->ssl, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
+#if OPENSSL_VERSION_NUMBER > 0x10002000L
+      SSL_set_ecdh_auto(tls->ssl, 1);
+#endif
+    }
+  }
+  if (opts->ciphers != NULL) SSL_set_cipher_list(tls->ssl, opts->ciphers);
+  if (opts->srvname.len > 0) {
+    char mem[128], *buf = mem;
+    mg_asprintf(&buf, sizeof(mem), "%.*s", (int) opts->srvname.len,
+                opts->srvname.ptr);
+    SSL_set_tlsext_host_name(tls->ssl, buf);
+    if (buf != mem) free(buf);
+  }
+  c->tls = tls;
+  c->is_tls = 1;
+  c->is_tls_hs = 1;
+  if (c->is_client && c->is_resolving == 0 && c->is_connecting == 0) {
+    mg_tls_handshake(c);
+  }
+  c->is_hexdumping = 1;
+  LOG(LL_DEBUG, ("%lu SSL %s OK", c->id, c->is_accepted ? "accept" : "client"));
+  return;
+fail:
+  c->is_closing = 1;
+  free(tls);
+}
+
+void mg_tls_handshake(struct mg_connection *c) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  int rc;
+  SSL_set_fd(tls->ssl, (int) (size_t) c->fd);
+  rc = c->is_client ? SSL_connect(tls->ssl) : SSL_accept(tls->ssl);
+  if (rc == 1) {
+    LOG(LL_DEBUG, ("%lu success", c->id));
+    c->is_tls_hs = 0;
+  } else {
+    int code = mg_tls_err(tls, rc);
+    if (code != 0) mg_error(c, "tls hs: rc %d, err %d", rc, code);
+  }
+}
+
+void mg_tls_free(struct mg_connection *c) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  if (tls == NULL) return;
+  SSL_free(tls->ssl);
+  SSL_CTX_free(tls->ctx);
+  free(tls);
+  c->tls = NULL;
+}
+
+long mg_tls_recv(struct mg_connection *c, void *buf, size_t len) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  int n = SSL_read(tls->ssl, buf, (int) len);
+  return n == 0 ? -1 : n < 0 && mg_tls_err(tls, n) == 0 ? 0 : n;
+}
+
+long mg_tls_send(struct mg_connection *c, const void *buf, size_t len) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  int n = SSL_write(tls->ssl, buf, (int) len);
+  return n == 0 ? -1 : n < 0 && mg_tls_err(tls, n) == 0 ? 0 : n;
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/url.c"
+#endif
+
+#include <stdlib.h>
+
+struct url {
+  size_t key, user, pass, host, port, uri, end;
+};
+
+int mg_url_is_ssl(const char *url) {
+  return strncmp(url, "wss:", 4) == 0 || strncmp(url, "https:", 6) == 0 ||
+         strncmp(url, "mqtts:", 6) == 0 || strncmp(url, "ssl:", 4) == 0 ||
+         strncmp(url, "tls:", 4) == 0;
+}
+
+static struct url urlparse(const char *url) {
+  size_t i;
+  struct url u;
+  memset(&u, 0, sizeof(u));
+  for (i = 0; url[i] != '\0'; i++) {
+    if (i > 0 && u.host == 0 && url[i - 1] == '/' && url[i] == '/') {
+      u.host = i + 1;
+      u.port = 0;
+    } else if (url[i] == ']') {
+      u.port = 0;  // IPv6 URLs, like http://[::1]/bar
+    } else if (url[i] == ':' && u.port == 0 && u.uri == 0) {
+      u.port = i + 1;
+    } else if (url[i] == '@' && u.user == 0 && u.pass == 0) {
+      u.user = u.host;
+      u.pass = u.port;
+      u.host = i + 1;
+      u.port = 0;
+    } else if (u.host && u.uri == 0 && url[i] == '/') {
+      u.uri = i;
+    }
+  }
+  u.end = i;
+#if 0
+  printf("[%s] %d %d %d %d %d\n", url, u.user, u.pass, u.host, u.port, u.uri);
+#endif
+  return u;
+}
+
+struct mg_str mg_url_host(const char *url) {
+  struct url u = urlparse(url);
+  size_t n = u.port  ? u.port - u.host - 1
+             : u.uri ? u.uri - u.host
+                     : u.end - u.host;
+  struct mg_str s = mg_str_n(url + u.host, n);
+  return s;
+}
+
+const char *mg_url_uri(const char *url) {
+  struct url u = urlparse(url);
+  return u.uri ? url + u.uri : "/";
+}
+
+unsigned short mg_url_port(const char *url) {
+  struct url u = urlparse(url);
+  unsigned short port = 0;
+  if (memcmp(url, "http:", 5) == 0 || memcmp(url, "ws:", 3) == 0) port = 80;
+  if (memcmp(url, "wss:", 4) == 0 || memcmp(url, "https:", 6) == 0) port = 443;
+  if (memcmp(url, "mqtt:", 5) == 0) port = 1883;
+  if (memcmp(url, "mqtts:", 6) == 0) port = 8883;
+  if (u.port) port = (unsigned short) atoi(url + u.port);
+  return port;
+}
+
+struct mg_str mg_url_user(const char *url) {
+  struct url u = urlparse(url);
+  struct mg_str s = mg_str("");
+  if (u.user && (u.pass || u.host)) {
+    size_t n = u.pass ? u.pass - u.user - 1 : u.host - u.user - 1;
+    s = mg_str_n(url + u.user, n);
+  }
+  return s;
+}
+
+struct mg_str mg_url_pass(const char *url) {
+  struct url u = urlparse(url);
+  struct mg_str s = mg_str_n("", 0UL);
+  if (u.pass && u.host) {
+    size_t n = u.host - u.pass - 1;
+    s = mg_str_n(url + u.pass, n);
+  }
+  return s;
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/util.c"
+#endif
+
+
+
+
+#if MG_ARCH == MG_ARCH_UNIX && defined(__APPLE__)
+#include <mach/mach_time.h>
+#endif
+
+char *mg_file_read(const char *path, size_t *sizep) {
+  FILE *fp;
+  char *data = NULL;
+  size_t size = 0;
+  if ((fp = fopen(path, "rb")) != NULL) {
+    fseek(fp, 0, SEEK_END);
+    size = (size_t) ftell(fp);
+    rewind(fp);
+    data = (char *) calloc(1, size + 1);
+    if (data != NULL) {
+      if (fread(data, 1, size, fp) != size) {
+        free(data);
+        data = NULL;
+      } else {
+        data[size] = '\0';
+        if (sizep != NULL) *sizep = size;
+      }
+    }
+    fclose(fp);
+  }
+  return data;
+}
+
+bool mg_file_write(const char *path, const void *buf, size_t len) {
+  bool result = false;
+  FILE *fp;
+  char tmp[MG_PATH_MAX];
+  snprintf(tmp, sizeof(tmp), "%s.%d", path, rand());
+  fp = fopen(tmp, "wb");
+  if (fp != NULL) {
+    result = fwrite(buf, 1, len, fp) == len;
+    fclose(fp);
+    if (result) {
+      remove(path);
+      rename(tmp, path);
+    } else {
+      remove(tmp);
+    }
+  }
+  return result;
+}
+
+bool mg_file_printf(const char *path, const char *fmt, ...) {
+  char tmp[256], *buf = tmp;
+  bool result;
+  int len;
+  va_list ap;
+  va_start(ap, fmt);
+  len = mg_vasprintf(&buf, sizeof(tmp), fmt, ap);
+  va_end(ap);
+  result = mg_file_write(path, buf, len > 0 ? (size_t) len : 0);
+  if (buf != tmp) free(buf);
+  return result;
+}
+
+#if MG_ENABLE_CUSTOM_RANDOM
+#else
+void mg_random(void *buf, size_t len) {
+  bool done = false;
+  unsigned char *p = (unsigned char *) buf;
+#if MG_ARCH == MG_ARCH_ESP32
+  while (len--) *p++ = (unsigned char) (esp_random() & 255);
+  done = true;
+#elif MG_ARCH == MG_ARCH_WIN32
+#elif MG_ARCH_UNIX
+  FILE *fp = fopen("/dev/urandom", "rb");
+  if (fp != NULL) {
+    if (fread(buf, 1, len, fp) == len) done = true;
+    fclose(fp);
+  }
+#endif
+  // If everything above did not work, fallback to a pseudo random generator
+  while (!done && len--) *p++ = (unsigned char) (rand() & 255);
+}
+#endif
+
+bool mg_globmatch(const char *s1, size_t n1, const char *s2, size_t n2) {
+  size_t i = 0, j = 0, ni = 0, nj = 0;
+  while (i < n1 || j < n2) {
+    if (i < n1 && j < n2 && (s1[i] == '?' || s2[j] == s1[i])) {
+      i++, j++;
+    } else if (i < n1 && (s1[i] == '*' || s1[i] == '#')) {
+      ni = i, nj = j + 1, i++;
+    } else if (nj > 0 && nj <= n2 && (s1[ni] == '#' || s2[j] != '/')) {
+      i = ni, j = nj;
+    } else {
+      // printf(">>: [%s] [%s] %d %d %d %d\n", s1, s2, i, j, ni, nj);
+      return false;
+    }
+  }
+  return true;
+}
+
+static size_t mg_nce(const char *s, size_t n, size_t ofs, size_t *koff,
+                     size_t *klen, size_t *voff, size_t *vlen) {
+  size_t kvlen, kl;
+  for (kvlen = 0; ofs + kvlen < n && s[ofs + kvlen] != ',';) kvlen++;
+  for (kl = 0; kl < kvlen && s[ofs + kl] != '=';) kl++;
+  if (koff != NULL) *koff = ofs;
+  if (klen != NULL) *klen = kl;
+  if (voff != NULL) *voff = kl < kvlen ? ofs + kl + 1 : 0;
+  if (vlen != NULL) *vlen = kl < kvlen ? kvlen - kl - 1 : 0;
+  ofs += kvlen + 1;
+  return ofs > n ? n : ofs;
+}
+
+bool mg_commalist(struct mg_str *s, struct mg_str *k, struct mg_str *v) {
+  size_t koff = 0, klen = 0, voff = 0, vlen = 0;
+  size_t off = mg_nce(s->ptr, s->len, 0, &koff, &klen, &voff, &vlen);
+  if (k != NULL) *k = mg_str_n(s->ptr + koff, klen);
+  if (v != NULL) *v = mg_str_n(s->ptr + voff, vlen);
+  *s = mg_str_n(s->ptr + off, s->len - off);
+  return off > 0;
+}
+
+uint32_t mg_ntohl(uint32_t net) {
+  uint8_t data[4] = {0, 0, 0, 0};
+  memcpy(&data, &net, sizeof(data));
+  return (((uint32_t) data[3]) << 0) | (((uint32_t) data[2]) << 8) |
+         (((uint32_t) data[1]) << 16) | (((uint32_t) data[0]) << 24);
+}
+
+uint16_t mg_ntohs(uint16_t net) {
+  uint8_t data[2] = {0, 0};
+  memcpy(&data, &net, sizeof(data));
+  return (uint16_t) ((uint16_t) data[1] | (((uint16_t) data[0]) << 8));
+}
+
+char *mg_hexdump(const void *buf, size_t len) {
+  const unsigned char *p = (const unsigned char *) buf;
+  size_t i, idx, n = 0, ofs = 0, dlen = len * 5 + 100;
+  char ascii[17] = "", *dst = (char *) calloc(1, dlen);
+  if (dst == NULL) return dst;
+  for (i = 0; i < len; i++) {
+    idx = i % 16;
+    if (idx == 0) {
+      if (i > 0 && dlen > n)
+        n += (size_t) snprintf(dst + n, dlen - n, "  %s\n", ascii);
+      if (dlen > n)
+        n += (size_t) snprintf(dst + n, dlen - n, "%04x ", (int) (i + ofs));
+    }
+    if (dlen < n) break;
+    n += (size_t) snprintf(dst + n, dlen - n, " %02x", p[i]);
+    ascii[idx] = (char) (p[i] < 0x20 || p[i] > 0x7e ? '.' : p[i]);
+    ascii[idx + 1] = '\0';
+  }
+  while (i++ % 16) {
+    if (n < dlen) n += (size_t) snprintf(dst + n, dlen - n, "%s", "   ");
+  }
+  if (n < dlen) n += (size_t) snprintf(dst + n, dlen - n, "  %s\n", ascii);
+  if (n > dlen - 1) n = dlen - 1;
+  dst[n] = '\0';
+  return dst;
+}
+
+char *mg_hex(const void *buf, size_t len, char *to) {
+  const unsigned char *p = (const unsigned char *) buf;
+  static const char *hex = "0123456789abcdef";
+  size_t i = 0;
+  for (; len--; p++) {
+    to[i++] = hex[p[0] >> 4];
+    to[i++] = hex[p[0] & 0x0f];
+  }
+  to[i] = '\0';
+  return to;
+}
+
+static unsigned char mg_unhex_nimble(unsigned char c) {
+  return (c >= '0' && c <= '9')   ? (unsigned char) (c - '0')
+         : (c >= 'A' && c <= 'F') ? (unsigned char) (c - '7')
+                                  : (unsigned char) (c - 'W');
+}
+
+unsigned long mg_unhexn(const char *s, size_t len) {
+  unsigned long i = 0, v = 0;
+  for (i = 0; i < len; i++) v <<= 4, v |= mg_unhex_nimble(((uint8_t *) s)[i]);
+  return v;
+}
+
+void mg_unhex(const char *buf, size_t len, unsigned char *to) {
+  size_t i;
+  for (i = 0; i < len; i += 2) {
+    to[i >> 1] = (unsigned char) mg_unhexn(&buf[i], 2);
+  }
+}
+
+int mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap) {
+  va_list ap_copy;
+  int len;
+
+  va_copy(ap_copy, ap);
+  len = vsnprintf(*buf, size, fmt, ap_copy);
+  va_end(ap_copy);
+
+  if (len < 0) {
+    // eCos and Windows are not standard-compliant and return -1 when
+    // the buffer is too small. Keep allocating larger buffers until we
+    // succeed or out of memory.
+    // LCOV_EXCL_START
+    *buf = NULL;
+    while (len < 0) {
+      free(*buf);
+      if (size == 0) size = 5;
+      size *= 2;
+      if ((*buf = (char *) calloc(1, size)) == NULL) {
+        len = -1;
+        break;
+      }
+      va_copy(ap_copy, ap);
+      len = vsnprintf(*buf, size - 1, fmt, ap_copy);
+      va_end(ap_copy);
+    }
+    // Microsoft version of vsnprintf() is not always null-terminated, so put
+    // the terminator manually
+    if (*buf != NULL) (*buf)[len] = 0;
+    // LCOV_EXCL_STOP
+  } else if (len >= (int) size) {
+    /// Standard-compliant code path. Allocate a buffer that is large enough
+    if ((*buf = (char *) calloc(1, (size_t) len + 1)) == NULL) {
+      len = -1;  // LCOV_EXCL_LINE
+    } else {     // LCOV_EXCL_LINE
+      va_copy(ap_copy, ap);
+      len = vsnprintf(*buf, (size_t) len + 1, fmt, ap_copy);
+      va_end(ap_copy);
+    }
+  }
+
+  return len;
+}
+
+int mg_asprintf(char **buf, size_t size, const char *fmt, ...) {
+  int ret;
+  va_list ap;
+  va_start(ap, fmt);
+  ret = mg_vasprintf(buf, size, fmt, ap);
+  va_end(ap);
+  return ret;
+}
+
+int64_t mg_to64(struct mg_str str) {
+  int64_t result = 0, neg = 1, max = 922337203685477570 /* INT64_MAX/10-10 */;
+  size_t i = 0;
+  while (i < str.len && (str.ptr[i] == ' ' || str.ptr[i] == '\t')) i++;
+  if (i < str.len && str.ptr[i] == '-') neg = -1, i++;
+  while (i < str.len && str.ptr[i] >= '0' && str.ptr[i] <= '9') {
+    if (result > max) return 0;
+    result *= 10;
+    result += (str.ptr[i] - '0');
+    i++;
+  }
+  return result * neg;
+}
+
+uint32_t mg_crc32(uint32_t crc, const char *buf, size_t len) {
+  int i;
+  crc = ~crc;
+  while (len--) {
+    crc ^= *(unsigned char *) buf++;
+    for (i = 0; i < 8; i++) crc = crc & 1 ? (crc >> 1) ^ 0xedb88320 : crc >> 1;
+  }
+  return ~crc;
+}
+
+static int isbyte(int n) {
+  return n >= 0 && n <= 255;
+}
+
+static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
+  int n, a, b, c, d, slash = 32, len = 0;
+  if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
+       sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
+      isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) && slash >= 0 &&
+      slash < 33) {
+    len = n;
+    *net = ((uint32_t) a << 24) | ((uint32_t) b << 16) | ((uint32_t) c << 8) |
+           (uint32_t) d;
+    *mask = slash ? (uint32_t) (0xffffffffU << (32 - slash)) : (uint32_t) 0;
+  }
+  return len;
+}
+
+int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip) {
+  struct mg_str k, v;
+  int allowed = acl.len == 0 ? '+' : '-';  // If any ACL is set, deny by default
+  while (mg_commalist(&acl, &k, &v)) {
+    uint32_t net, mask;
+    if (k.ptr[0] != '+' && k.ptr[0] != '-') return -1;
+    if (parse_net(&k.ptr[1], &net, &mask) == 0) return -2;
+    if ((remote_ip & mask) == net) allowed = k.ptr[0];
+  }
+  return allowed == '+';
+}
+
+double mg_time(void) {
+#if MG_ARCH == MG_ARCH_WIN32
+  SYSTEMTIME sysnow;
+  FILETIME ftime;
+  GetLocalTime(&sysnow);
+  SystemTimeToFileTime(&sysnow, &ftime);
+  /*
+   * 1. VC 6.0 doesn't support conversion uint64 -> double, so, using int64
+   * This should not cause a problems in this (21th) century
+   * 2. Windows FILETIME is a number of 100-nanosecond intervals since January
+   * 1, 1601 while time_t is a number of _seconds_ since January 1, 1970 UTC,
+   * thus, we need to convert to seconds and adjust amount (subtract 11644473600
+   * seconds)
+   */
+  return (double) (((int64_t) ftime.dwLowDateTime +
+                    ((int64_t) ftime.dwHighDateTime << 32)) /
+                   10000000.0) -
+         11644473600;
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP || MG_ARCH == MG_ARCH_AZURERTOS
+  return mg_millis() / 1000.0;
+#else
+  struct timeval tv;
+  if (gettimeofday(&tv, NULL /* tz */) != 0) return 0;
+  return (double) tv.tv_sec + (((double) tv.tv_usec) / 1000000.0);
+#endif /* _WIN32 */
+}
+
+void mg_usleep(unsigned long usecs) {
+#if MG_ARCH == MG_ARCH_WIN32
+  Sleep(usecs / 1000);
+#elif MG_ARCH == MG_ARCH_ESP8266
+  ets_delay_us(usecs);
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP || MG_ARCH == MG_ARCH_FREERTOS_LWIP
+  vTaskDelay(pdMS_TO_TICKS(usecs / 1000));
+#elif MG_ARCH == MG_ARCH_AZURERTOS
+  tx_thread_sleep((usecs / 1000) * TX_TIMER_TICKS_PER_SECOND);
+#else
+  usleep((useconds_t) usecs);
+#endif
+}
+
+unsigned long mg_millis(void) {
+#if MG_ARCH == MG_ARCH_WIN32
+  return GetTickCount();
+#elif MG_ARCH == MG_ARCH_ESP32
+  return esp_timer_get_time() / 1000;
+#elif MG_ARCH == MG_ARCH_ESP8266
+  return xTaskGetTickCount() * portTICK_PERIOD_MS;
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP || MG_ARCH == MG_ARCH_FREERTOS_LWIP
+  return xTaskGetTickCount() * portTICK_PERIOD_MS;
+#elif MG_ARCH == MG_ARCH_AZURERTOS
+  return tx_time_get() * (1000 /* MS per SEC */ / TX_TIMER_TICKS_PER_SECOND);
+#elif MG_ARCH == MG_ARCH_UNIX && defined(__APPLE__)
+  uint64_t ticks = mach_absolute_time();
+  static mach_timebase_info_data_t timebase;
+  mach_timebase_info(&timebase);
+  double ticks_to_nanos = (double)timebase.numer / timebase.denom;
+  uint64_t uptime_nanos = (uint64_t)(ticks_to_nanos * ticks);
+  return (unsigned long) (uptime_nanos / 1000000);
+#else
+  struct timespec ts;
+#ifdef _POSIX_MONOTONIC_CLOCK
+#ifdef CLOCK_MONOTONIC_RAW
+  clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
+#else
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+#endif
+#else
+  clock_gettime(CLOCK_REALTIME, &ts);
+#endif
+  return (unsigned long) ((uint64_t) ts.tv_sec * 1000 +
+                          (uint64_t) ts.tv_nsec / 1000000);
+#endif
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/ws.c"
+#endif
+
+
+
+
+
+
+
+
+
+struct ws_msg {
+  uint8_t flags;
+  size_t header_len;
+  size_t data_len;
+};
+
+static void ws_handshake(struct mg_connection *c, const struct mg_str *wskey,
+                         const struct mg_str *wsproto, const char *fmt,
+                         va_list ap) {
+  const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
+  unsigned char sha[20], b64_sha[30];
+  char mem[128], *buf = mem;
+
+  mg_sha1_ctx sha_ctx;
+  mg_sha1_init(&sha_ctx);
+  mg_sha1_update(&sha_ctx, (unsigned char *) wskey->ptr, wskey->len);
+  mg_sha1_update(&sha_ctx, (unsigned char *) magic, 36);
+  mg_sha1_final(sha, &sha_ctx);
+  mg_base64_encode(sha, sizeof(sha), (char *) b64_sha);
+  buf[0] = '\0';
+  if (fmt != NULL) mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  mg_printf(c,
+            "HTTP/1.1 101 Switching Protocols\r\n"
+            "Upgrade: websocket\r\n"
+            "Connection: Upgrade\r\n"
+            "Sec-WebSocket-Accept: %s\r\n"
+            "%s",
+            b64_sha, buf);
+  if (buf != mem) free(buf);
+  if (wsproto != NULL) {
+    mg_printf(c, "Sec-WebSocket-Protocol: %.*s\r\n", (int) wsproto->len,
+              wsproto->ptr);
+  }
+  mg_send(c, "\r\n", 2);
+}
+
+static size_t ws_process(uint8_t *buf, size_t len, struct ws_msg *msg) {
+  size_t i, n = 0, mask_len = 0;
+  memset(msg, 0, sizeof(*msg));
+  if (len >= 2) {
+    n = buf[1] & 0x7f;                // Frame length
+    mask_len = buf[1] & 128 ? 4 : 0;  // last bit is a mask bit
+    msg->flags = buf[0];
+    if (n < 126 && len >= mask_len) {
+      msg->data_len = n;
+      msg->header_len = 2 + mask_len;
+    } else if (n == 126 && len >= 4 + mask_len) {
+      msg->header_len = 4 + mask_len;
+      msg->data_len = mg_ntohs(*(uint16_t *) &buf[2]);
+    } else if (len >= 10 + mask_len) {
+      msg->header_len = 10 + mask_len;
+      msg->data_len =
+          (size_t) (((uint64_t) mg_ntohl(*(uint32_t *) &buf[2])) << 32) +
+          mg_ntohl(*(uint32_t *) &buf[6]);
+    }
+  }
+  // Sanity check, and integer overflow protection for the boundary check below
+  // data_len should not be larger than 1 Gb
+  if (msg->data_len > 1024 * 1024 * 1024) return 0;
+  if (msg->header_len + msg->data_len > len) return 0;
+  if (mask_len > 0) {
+    uint8_t *p = buf + msg->header_len, *m = p - mask_len;
+    for (i = 0; i < msg->data_len; i++) p[i] ^= m[i & 3];
+  }
+  return msg->header_len + msg->data_len;
+}
+
+static size_t mkhdr(size_t len, int op, bool is_client, uint8_t *buf) {
+  size_t n = 0;
+  buf[0] = (uint8_t) (op | 128);
+  if (len < 126) {
+    buf[1] = (unsigned char) len;
+    n = 2;
+  } else if (len < 65536) {
+    uint16_t tmp = mg_htons((uint16_t) len);
+    buf[1] = 126;
+    memcpy(&buf[2], &tmp, sizeof(tmp));
+    n = 4;
+  } else {
+    uint32_t tmp;
+    buf[1] = 127;
+    tmp = mg_htonl((uint32_t) ((uint64_t) len >> 32));
+    memcpy(&buf[2], &tmp, sizeof(tmp));
+    tmp = mg_htonl((uint32_t) (len & 0xffffffff));
+    memcpy(&buf[6], &tmp, sizeof(tmp));
+    n = 10;
+  }
+  if (is_client) {
+    buf[1] |= 1 << 7;  // Set masking flag
+    mg_random(&buf[n], 4);
+    n += 4;
+  }
+  return n;
+}
+
+static void mg_ws_mask(struct mg_connection *c, size_t len) {
+  if (c->is_client && c->send.buf != NULL) {
+    size_t i;
+    uint8_t *p = c->send.buf + c->send.len - len, *mask = p - 4;
+    for (i = 0; i < len; i++) p[i] ^= mask[i & 3];
+  }
+}
+
+size_t mg_ws_send(struct mg_connection *c, const char *buf, size_t len,
+                  int op) {
+  uint8_t header[14];
+  size_t header_len = mkhdr(len, op, c->is_client, header);
+  mg_send(c, header, header_len);
+  LOG(LL_VERBOSE_DEBUG, ("WS out: %d [%.*s]", (int) len, (int) len, buf));
+  mg_send(c, buf, len);
+  mg_ws_mask(c, len);
+  return header_len + len;
+}
+
+static void mg_ws_cb(struct mg_connection *c, int ev, void *ev_data,
+                     void *fn_data) {
+  struct ws_msg msg;
+  size_t ofs = (size_t) c->pfn_data;
+
+  // assert(ofs < c->recv.len);
+  if (ev == MG_EV_READ) {
+    if (!c->is_websocket && c->is_client) {
+      int n = mg_http_get_request_len(c->recv.buf, c->recv.len);
+      if (n < 0) {
+        c->is_closing = 1;  // Some just, not an HTTP request
+      } else if (n > 0) {
+        if (n < 15 || memcmp(c->recv.buf + 9, "101", 3) != 0) {
+          LOG(LL_ERROR,
+              ("%lu WS handshake error: %.*s", c->id, 15, c->recv.buf));
+          c->is_closing = 1;
+        } else {
+          struct mg_http_message hm;
+          mg_http_parse((char *) c->recv.buf, c->recv.len, &hm);
+          c->is_websocket = 1;
+          mg_call(c, MG_EV_WS_OPEN, &hm);
+        }
+        mg_iobuf_del(&c->recv, 0, (size_t) n);
+      } else {
+        return;  // A request is not yet received
+      }
+    }
+
+    while (ws_process(c->recv.buf + ofs, c->recv.len - ofs, &msg) > 0) {
+      char *s = (char *) c->recv.buf + ofs + msg.header_len;
+      struct mg_ws_message m = {{s, msg.data_len}, msg.flags};
+      size_t len = msg.header_len + msg.data_len;
+      uint8_t final = msg.flags & 128, op = msg.flags & 15;
+      // LOG(LL_VERBOSE_DEBUG, ("fin %d op %d len %d [%.*s]", final, op,
+      //                       (int) m.data.len, (int) m.data.len, m.data.ptr));
+      switch (op) {
+        case WEBSOCKET_OP_CONTINUE:
+          mg_call(c, MG_EV_WS_CTL, &m);
+          break;
+        case WEBSOCKET_OP_PING:
+          LOG(LL_DEBUG, ("%s", "WS PONG"));
+          mg_ws_send(c, s, msg.data_len, WEBSOCKET_OP_PONG);
+          mg_call(c, MG_EV_WS_CTL, &m);
+          break;
+        case WEBSOCKET_OP_PONG:
+          mg_call(c, MG_EV_WS_CTL, &m);
+          break;
+        case WEBSOCKET_OP_TEXT:
+        case WEBSOCKET_OP_BINARY:
+          if (final) mg_call(c, MG_EV_WS_MSG, &m);
+          break;
+        case WEBSOCKET_OP_CLOSE:
+          LOG(LL_ERROR, ("%lu Got WS CLOSE", c->id));
+          mg_call(c, MG_EV_WS_CTL, &m);
+          c->is_closing = 1;
+          break;
+        default:
+          // Per RFC6455, close conn when an unknown op is recvd
+          mg_error(c, "unknown WS op %d", op);
+          break;
+      }
+
+      // Handle fragmented frames: strip header, keep in c->recv
+      if (final == 0 || op == 0) {
+        if (op) ofs++, len--, msg.header_len--;       // First frame
+        mg_iobuf_del(&c->recv, ofs, msg.header_len);  // Strip header
+        len -= msg.header_len;
+        ofs += len;
+        c->pfn_data = (void *) ofs;
+        // LOG(LL_INFO, ("FRAG %d [%.*s]", (int) ofs, (int) ofs, c->recv.buf));
+      }
+      // Remove non-fragmented frame
+      if (final && op) mg_iobuf_del(&c->recv, ofs, len);
+      // Last chunk of the fragmented frame
+      if (final && !op) {
+        m.flags = c->recv.buf[0];
+        m.data = mg_str_n((char *) &c->recv.buf[1], (size_t) (ofs - 1));
+        mg_call(c, MG_EV_WS_MSG, &m);
+        mg_iobuf_del(&c->recv, 0, ofs);
+        ofs = 0;
+        c->pfn_data = NULL;
+      }
+    }
+  }
+  (void) fn_data;
+  (void) ev_data;
+}
+
+struct mg_connection *mg_ws_connect(struct mg_mgr *mgr, const char *url,
+                                    mg_event_handler_t fn, void *fn_data,
+                                    const char *fmt, ...) {
+  struct mg_connection *c = mg_connect(mgr, url, fn, fn_data);
+  if (c != NULL) {
+    char nonce[16], key[30], mem1[128], mem2[256], *buf1 = mem1, *buf2 = mem2;
+    struct mg_str host = mg_url_host(url);
+    int n1 = 0, n2 = 0;
+    if (fmt != NULL) {
+      va_list ap;
+      va_start(ap, fmt);
+      n1 = mg_vasprintf(&buf1, sizeof(mem1), fmt, ap);
+      va_end(ap);
+    }
+    // Send handshake request
+    // mg_url_host(url, host, sizeof(host));
+    mg_random(nonce, sizeof(nonce));
+    mg_base64_encode((unsigned char *) nonce, sizeof(nonce), key);
+    // LOG(LL_DEBUG, "%p [%s]", uri, uri == NULL ? "???" : uri);
+    n2 = mg_asprintf(&buf2, sizeof(mem2),
+                     "GET %s HTTP/1.1\r\n"
+                     "Upgrade: websocket\r\n"
+                     "Host: %.*s\r\n"
+                     "Connection: Upgrade\r\n"
+                     "%.*s"
+                     "Sec-WebSocket-Version: 13\r\n"
+                     "Sec-WebSocket-Key: %s\r\n"
+                     "\r\n",
+                     mg_url_uri(url), (int) host.len, host.ptr, n1, buf1, key);
+    mg_send(c, buf2, n2 > 0 ? (size_t) n2 : 0);
+    if (buf1 != mem1) free(buf1);
+    if (buf2 != mem2) free(buf2);
+    c->pfn = mg_ws_cb;
+    c->pfn_data = NULL;
+  }
+  return c;
+}
+
+void mg_ws_upgrade(struct mg_connection *c, struct mg_http_message *hm,
+                   const char *fmt, ...) {
+  struct mg_str *wskey = mg_http_get_header(hm, "Sec-WebSocket-Key");
+  c->pfn = mg_ws_cb;
+  c->pfn_data = NULL;
+  if (wskey == NULL) {
+    mg_http_reply(c, 426, "", "WS upgrade expected\n");
+    c->is_draining = 1;
+  } else {
+    struct mg_str *wsproto = mg_http_get_header(hm, "Sec-WebSocket-Protocol");
+    va_list ap;
+    va_start(ap, fmt);
+    ws_handshake(c, wskey, wsproto, fmt, ap);
+    va_end(ap);
+    c->is_websocket = 1;
+    mg_call(c, MG_EV_WS_OPEN, hm);
+  }
+}
+
+size_t mg_ws_wrap(struct mg_connection *c, size_t len, int op) {
+  uint8_t header[14], *p;
+  size_t header_len = mkhdr(len, op, c->is_client, header);
+
+  // NOTE: order of operations is important!
+  mg_iobuf_add(&c->send, c->send.len, NULL, header_len, MG_IO_SIZE);
+  p = &c->send.buf[c->send.len - len];         // p points to data
+  memmove(p, p - header_len, len);             // Shift data
+  memcpy(p - header_len, header, header_len);  // Prepend header
+  mg_ws_mask(c, len);                          // Mask data
+
+  return c->send.len;
+}