Publish mongoose src and tests

CL: Mongoose Web Server: Publish sources and tests

Resolves https://github.com/cesanta/mongoose/issues/745

PUBLISHED_FROM=7ecd7a3c518cfa614a6ba0838678dcb91b75a8c0

src/CPPLINT.cfg

+exclude_files=sha1\.c

src/coap.h

+/*
+ * Copyright (c) 2015 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.cesanta.com/license>.
+ */
+
+/*
+ * === CoAP API reference
+ *
+ * CoAP message format:
+ *
+ * ```
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
+ * |Ver| T | TKL | Code | Message ID | Token (if any, TKL bytes) ...
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
+ * | Options (if any) ...            |1 1 1 1 1 1 1 1| Payload (if any) ...
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
+ * ```
+ */
+
+#ifndef CS_MONGOOSE_SRC_COAP_H_
+#define CS_MONGOOSE_SRC_COAP_H_
+
+#if MG_ENABLE_COAP
+
+#define MG_COAP_MSG_TYPE_FIELD 0x2
+#define MG_COAP_CODE_CLASS_FIELD 0x4
+#define MG_COAP_CODE_DETAIL_FIELD 0x8
+#define MG_COAP_MSG_ID_FIELD 0x10
+#define MG_COAP_TOKEN_FIELD 0x20
+#define MG_COAP_OPTIOMG_FIELD 0x40
+#define MG_COAP_PAYLOAD_FIELD 0x80
+
+#define MG_COAP_ERROR 0x10000
+#define MG_COAP_FORMAT_ERROR (MG_COAP_ERROR | 0x20000)
+#define MG_COAP_IGNORE (MG_COAP_ERROR | 0x40000)
+#define MG_COAP_NOT_ENOUGH_DATA (MG_COAP_ERROR | 0x80000)
+#define MG_COAP_NETWORK_ERROR (MG_COAP_ERROR | 0x100000)
+
+#define MG_COAP_MSG_CON 0
+#define MG_COAP_MSG_NOC 1
+#define MG_COAP_MSG_ACK 2
+#define MG_COAP_MSG_RST 3
+#define MG_COAP_MSG_MAX 3
+
+#define MG_COAP_CODECLASS_REQUEST 0
+#define MG_COAP_CODECLASS_RESP_OK 2
+#define MG_COAP_CODECLASS_CLIENT_ERR 4
+#define MG_COAP_CODECLASS_SRV_ERR 5
+
+#define MG_COAP_EVENT_BASE 300
+#define MG_EV_COAP_CON (MG_COAP_EVENT_BASE + MG_COAP_MSG_CON)
+#define MG_EV_COAP_NOC (MG_COAP_EVENT_BASE + MG_COAP_MSG_NOC)
+#define MG_EV_COAP_ACK (MG_COAP_EVENT_BASE + MG_COAP_MSG_ACK)
+#define MG_EV_COAP_RST (MG_COAP_EVENT_BASE + MG_COAP_MSG_RST)
+
+/*
+ * CoAP options.
+ * Use mg_coap_add_option and mg_coap_free_options
+ * for creation and destruction.
+ */
+struct mg_coap_option {
+  struct mg_coap_option *next;
+  uint32_t number;
+  struct mg_str value;
+};
+
+/* CoAP message. See RFC 7252 for details. */
+struct mg_coap_message {
+  uint32_t flags;
+  uint8_t msg_type;
+  uint8_t code_class;
+  uint8_t code_detail;
+  uint16_t msg_id;
+  struct mg_str token;
+  struct mg_coap_option *options;
+  struct mg_str payload;
+  struct mg_coap_option *optiomg_tail;
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* Sets CoAP protocol handler - triggers CoAP specific events. */
+int mg_set_protocol_coap(struct mg_connection *nc);
+
+/*
+ * Adds a new option to mg_coap_message structure.
+ * Returns pointer to the newly created option.
+ * Note: options must be freed by using mg_coap_free_options
+ */
+struct mg_coap_option *mg_coap_add_option(struct mg_coap_message *cm,
+                                          uint32_t number, char *value,
+                                          size_t len);
+
+/*
+ * Frees the memory allocated for options.
+ * If the cm parameter doesn't contain any option it does nothing.
+ */
+void mg_coap_free_options(struct mg_coap_message *cm);
+
+/*
+ * Composes a CoAP message from `mg_coap_message`
+ * and sends it into `nc` connection.
+ * Returns 0 on success. On error, it is a bitmask:
+ *
+ * - `#define MG_COAP_ERROR 0x10000`
+ * - `#define MG_COAP_FORMAT_ERROR (MG_COAP_ERROR | 0x20000)`
+ * - `#define MG_COAP_IGNORE (MG_COAP_ERROR | 0x40000)`
+ * - `#define MG_COAP_NOT_ENOUGH_DATA (MG_COAP_ERROR | 0x80000)`
+ * - `#define MG_COAP_NETWORK_ERROR (MG_COAP_ERROR | 0x100000)`
+ */
+uint32_t mg_coap_send_message(struct mg_connection *nc,
+                              struct mg_coap_message *cm);
+
+/*
+ * Composes CoAP acknowledgement from `mg_coap_message`
+ * and sends it into `nc` connection.
+ * Return value: see `mg_coap_send_message()`
+ */
+uint32_t mg_coap_send_ack(struct mg_connection *nc, uint16_t msg_id);
+
+/*
+ * Parses CoAP message and fills mg_coap_message and returns cm->flags.
+ * This is a helper function.
+ *
+ * NOTE: usually CoAP works over UDP, so lack of data means format error.
+ * But, in theory, it is possible to use CoAP over TCP (according to RFC)
+ *
+ * The caller has to check results and treat COAP_NOT_ENOUGH_DATA according to
+ * underlying protocol:
+ *
+ * - in case of UDP COAP_NOT_ENOUGH_DATA means COAP_FORMAT_ERROR,
+ * - in case of TCP client can try to receive more data
+ *
+ * Return value: see `mg_coap_send_message()`
+ */
+uint32_t mg_coap_parse(struct mbuf *io, struct mg_coap_message *cm);
+
+/*
+ * Composes CoAP message from mg_coap_message structure.
+ * This is a helper function.
+ * Return value: see `mg_coap_send_message()`
+ */
+uint32_t mg_coap_compose(struct mg_coap_message *cm, struct mbuf *io);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* MG_ENABLE_COAP */
+
+#endif /* CS_MONGOOSE_SRC_COAP_H_ */

src/common.h

+/*
+ * Copyright (c) 2004-2013 Sergey Lyubka
+ * Copyright (c) 2013-2015 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.cesanta.com/license>.
+ */
+
+#ifndef CS_MONGOOSE_SRC_COMMON_H_
+#define CS_MONGOOSE_SRC_COMMON_H_
+
+#define MG_VERSION "6.10"
+
+/* Local tweaks, applied before any of Mongoose's own headers. */
+#ifdef MG_LOCALS
+#include <mg_locals.h>
+#endif
+
+#endif /* CS_MONGOOSE_SRC_COMMON_H_ */

src/dns.c

+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_DNS
+
+#include "mongoose/src/internal.h"
+#include "mongoose/src/dns.h"
+
+static int mg_dns_tid = 0xa0;
+
+struct mg_dns_header {
+  uint16_t transaction_id;
+  uint16_t flags;
+  uint16_t num_questions;
+  uint16_t num_answers;
+  uint16_t num_authority_prs;
+  uint16_t num_other_prs;
+};
+
+struct mg_dns_resource_record *mg_dns_next_record(
+    struct mg_dns_message *msg, int query,
+    struct mg_dns_resource_record *prev) {
+  struct mg_dns_resource_record *rr;
+
+  for (rr = (prev == NULL ? msg->answers : prev + 1);
+       rr - msg->answers < msg->num_answers; rr++) {
+    if (rr->rtype == query) {
+      return rr;
+    }
+  }
+  return NULL;
+}
+
+int mg_dns_parse_record_data(struct mg_dns_message *msg,
+                             struct mg_dns_resource_record *rr, void *data,
+                             size_t data_len) {
+  switch (rr->rtype) {
+    case MG_DNS_A_RECORD:
+      if (data_len < sizeof(struct in_addr)) {
+        return -1;
+      }
+      if (rr->rdata.p + data_len > msg->pkt.p + msg->pkt.len) {
+        return -1;
+      }
+      memcpy(data, rr->rdata.p, data_len);
+      return 0;
+#if MG_ENABLE_IPV6
+    case MG_DNS_AAAA_RECORD:
+      if (data_len < sizeof(struct in6_addr)) {
+        return -1; /* LCOV_EXCL_LINE */
+      }
+      memcpy(data, rr->rdata.p, data_len);
+      return 0;
+#endif
+    case MG_DNS_CNAME_RECORD:
+      mg_dns_uncompress_name(msg, &rr->rdata, (char *) data, data_len);
+      return 0;
+  }
+
+  return -1;
+}
+
+int mg_dns_insert_header(struct mbuf *io, size_t pos,
+                         struct mg_dns_message *msg) {
+  struct mg_dns_header header;
+
+  memset(&header, 0, sizeof(header));
+  header.transaction_id = msg->transaction_id;
+  header.flags = htons(msg->flags);
+  header.num_questions = htons(msg->num_questions);
+  header.num_answers = htons(msg->num_answers);
+
+  return mbuf_insert(io, pos, &header, sizeof(header));
+}
+
+int mg_dns_copy_questions(struct mbuf *io, struct mg_dns_message *msg) {
+  unsigned char *begin, *end;
+  struct mg_dns_resource_record *last_q;
+  if (msg->num_questions <= 0) return 0;
+  begin = (unsigned char *) msg->pkt.p + sizeof(struct mg_dns_header);
+  last_q = &msg->questions[msg->num_questions - 1];
+  end = (unsigned char *) last_q->name.p + last_q->name.len + 4;
+  return mbuf_append(io, begin, end - begin);
+}
+
+int mg_dns_encode_name(struct mbuf *io, const char *name, size_t len) {
+  const char *s;
+  unsigned char n;
+  size_t pos = io->len;
+
+  do {
+    if ((s = strchr(name, '.')) == NULL) {
+      s = name + len;
+    }
+
+    if (s - name > 127) {
+      return -1; /* TODO(mkm) cover */
+    }
+    n = s - name;           /* chunk length */
+    mbuf_append(io, &n, 1); /* send length */
+    mbuf_append(io, name, n);
+
+    if (*s == '.') {
+      n++;
+    }
+
+    name += n;
+    len -= n;
+  } while (*s != '\0');
+  mbuf_append(io, "\0", 1); /* Mark end of host name */
+
+  return io->len - pos;
+}
+
+int mg_dns_encode_record(struct mbuf *io, struct mg_dns_resource_record *rr,
+                         const char *name, size_t nlen, const void *rdata,
+                         size_t rlen) {
+  size_t pos = io->len;
+  uint16_t u16;
+  uint32_t u32;
+
+  if (rr->kind == MG_DNS_INVALID_RECORD) {
+    return -1; /* LCOV_EXCL_LINE */
+  }
+
+  if (mg_dns_encode_name(io, name, nlen) == -1) {
+    return -1;
+  }
+
+  u16 = htons(rr->rtype);
+  mbuf_append(io, &u16, 2);
+  u16 = htons(rr->rclass);
+  mbuf_append(io, &u16, 2);
+
+  if (rr->kind == MG_DNS_ANSWER) {
+    u32 = htonl(rr->ttl);
+    mbuf_append(io, &u32, 4);
+
+    if (rr->rtype == MG_DNS_CNAME_RECORD) {
+      int clen;
+      /* fill size after encoding */
+      size_t off = io->len;
+      mbuf_append(io, &u16, 2);
+      if ((clen = mg_dns_encode_name(io, (const char *) rdata, rlen)) == -1) {
+        return -1;
+      }
+      u16 = clen;
+      io->buf[off] = u16 >> 8;
+      io->buf[off + 1] = u16 & 0xff;
+    } else {
+      u16 = htons((uint16_t) rlen);
+      mbuf_append(io, &u16, 2);
+      mbuf_append(io, rdata, rlen);
+    }
+  }
+
+  return io->len - pos;
+}
+
+void mg_send_dns_query(struct mg_connection *nc, const char *name,
+                       int query_type) {
+  struct mg_dns_message *msg =
+      (struct mg_dns_message *) MG_CALLOC(1, sizeof(*msg));
+  struct mbuf pkt;
+  struct mg_dns_resource_record *rr = &msg->questions[0];
+
+  DBG(("%s %d", name, query_type));
+
+  mbuf_init(&pkt, 64 /* Start small, it'll grow as needed. */);
+
+  msg->transaction_id = ++mg_dns_tid;
+  msg->flags = 0x100;
+  msg->num_questions = 1;
+
+  mg_dns_insert_header(&pkt, 0, msg);
+
+  rr->rtype = query_type;
+  rr->rclass = 1; /* Class: inet */
+  rr->kind = MG_DNS_QUESTION;
+
+  if (mg_dns_encode_record(&pkt, rr, name, strlen(name), NULL, 0) == -1) {
+    /* TODO(mkm): return an error code */
+    goto cleanup; /* LCOV_EXCL_LINE */
+  }
+
+  /* TCP DNS requires messages to be prefixed with len */
+  if (!(nc->flags & MG_F_UDP)) {
+    uint16_t len = htons((uint16_t) pkt.len);
+    mbuf_insert(&pkt, 0, &len, 2);
+  }
+
+  mg_send(nc, pkt.buf, pkt.len);
+  mbuf_free(&pkt);
+
+cleanup:
+  MG_FREE(msg);
+}
+
+static unsigned char *mg_parse_dns_resource_record(
+    unsigned char *data, unsigned char *end, struct mg_dns_resource_record *rr,
+    int reply) {
+  unsigned char *name = data;
+  int chunk_len, data_len;
+
+  while (data < end && (chunk_len = *data)) {
+    if (((unsigned char *) data)[0] & 0xc0) {
+      data += 1;
+      break;
+    }
+    data += chunk_len + 1;
+  }
+
+  if (data > end - 5) {
+    return NULL;
+  }
+
+  rr->name.p = (char *) name;
+  rr->name.len = data - name + 1;
+  data++;
+
+  rr->rtype = data[0] << 8 | data[1];
+  data += 2;
+
+  rr->rclass = data[0] << 8 | data[1];
+  data += 2;
+
+  rr->kind = reply ? MG_DNS_ANSWER : MG_DNS_QUESTION;
+  if (reply) {
+    if (data >= end - 6) {
+      return NULL;
+    }
+
+    rr->ttl = (uint32_t) data[0] << 24 | (uint32_t) data[1] << 16 |
+              data[2] << 8 | data[3];
+    data += 4;
+
+    data_len = *data << 8 | *(data + 1);
+    data += 2;
+
+    rr->rdata.p = (char *) data;
+    rr->rdata.len = data_len;
+    data += data_len;
+  }
+  return data;
+}
+
+int mg_parse_dns(const char *buf, int len, struct mg_dns_message *msg) {
+  struct mg_dns_header *header = (struct mg_dns_header *) buf;
+  unsigned char *data = (unsigned char *) buf + sizeof(*header);
+  unsigned char *end = (unsigned char *) buf + len;
+  int i;
+
+  memset(msg, 0, sizeof(*msg));
+  msg->pkt.p = buf;
+  msg->pkt.len = len;
+
+  if (len < (int) sizeof(*header)) return -1;
+
+  msg->transaction_id = header->transaction_id;
+  msg->flags = ntohs(header->flags);
+  msg->num_questions = ntohs(header->num_questions);
+  if (msg->num_questions > (int) ARRAY_SIZE(msg->questions)) {
+    msg->num_questions = (int) ARRAY_SIZE(msg->questions);
+  }
+  msg->num_answers = ntohs(header->num_answers);
+  if (msg->num_answers > (int) ARRAY_SIZE(msg->answers)) {
+    msg->num_answers = (int) ARRAY_SIZE(msg->answers);
+  }
+
+  for (i = 0; i < msg->num_questions; i++) {
+    data = mg_parse_dns_resource_record(data, end, &msg->questions[i], 0);
+    if (data == NULL) return -1;
+  }
+
+  for (i = 0; i < msg->num_answers; i++) {
+    data = mg_parse_dns_resource_record(data, end, &msg->answers[i], 1);
+    if (data == NULL) return -1;
+  }
+
+  return 0;
+}
+
+size_t mg_dns_uncompress_name(struct mg_dns_message *msg, struct mg_str *name,
+                              char *dst, int dst_len) {
+  int chunk_len, num_ptrs = 0;
+  char *old_dst = dst;
+  const unsigned char *data = (unsigned char *) name->p;
+  const unsigned char *end = (unsigned char *) msg->pkt.p + msg->pkt.len;
+
+  if (data >= end) {
+    return 0;
+  }
+
+  while ((chunk_len = *data++)) {
+    int leeway = dst_len - (dst - old_dst);
+    if (data >= end) {
+      return 0;
+    }
+
+    if ((chunk_len & 0xc0) == 0xc0) {
+      uint16_t off = (data[-1] & (~0xc0)) << 8 | data[0];
+      if (off >= msg->pkt.len) {
+        return 0;
+      }
+      /* Basic circular loop avoidance: allow up to 16 pointer hops. */
+      if (++num_ptrs > 15) {
+        return 0;
+      }
+      data = (unsigned char *) msg->pkt.p + off;
+      continue;
+    }
+    if (chunk_len > 63) {
+      return 0;
+    }
+    if (chunk_len > leeway) {
+      chunk_len = leeway;
+    }
+
+    if (data + chunk_len >= end) {
+      return 0;
+    }
+
+    memcpy(dst, data, chunk_len);
+    data += chunk_len;
+    dst += chunk_len;
+    leeway -= chunk_len;
+    if (leeway == 0) {
+      return dst - old_dst;
+    }
+    *dst++ = '.';
+  }
+
+  if (dst != old_dst) {
+    *--dst = 0;
+  }
+  return dst - old_dst;
+}
+
+static void dns_handler(struct mg_connection *nc, int ev,
+                        void *ev_data MG_UD_ARG(void *user_data)) {
+  struct mbuf *io = &nc->recv_mbuf;
+  struct mg_dns_message msg;
+
+  /* Pass low-level events to the user handler */
+  nc->handler(nc, ev, ev_data MG_UD_ARG(user_data));
+
+  switch (ev) {
+    case MG_EV_RECV:
+      if (!(nc->flags & MG_F_UDP)) {
+        mbuf_remove(&nc->recv_mbuf, 2);
+      }
+      if (mg_parse_dns(nc->recv_mbuf.buf, nc->recv_mbuf.len, &msg) == -1) {
+        /* reply + recursion allowed + format error */
+        memset(&msg, 0, sizeof(msg));
+        msg.flags = 0x8081;
+        mg_dns_insert_header(io, 0, &msg);
+        if (!(nc->flags & MG_F_UDP)) {
+          uint16_t len = htons((uint16_t) io->len);
+          mbuf_insert(io, 0, &len, 2);
+        }
+        mg_send(nc, io->buf, io->len);
+      } else {
+        /* Call user handler with parsed message */
+        nc->handler(nc, MG_DNS_MESSAGE, &msg MG_UD_ARG(user_data));
+      }
+      mbuf_remove(io, io->len);
+      break;
+  }
+}
+
+void mg_set_protocol_dns(struct mg_connection *nc) {
+  nc->proto_handler = dns_handler;
+}
+
+#endif /* MG_ENABLE_DNS */

src/dns.h

+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/*
+ * === DNS API reference
+ */
+
+#ifndef CS_MONGOOSE_SRC_DNS_H_
+#define CS_MONGOOSE_SRC_DNS_H_
+
+#include "mongoose/src/net.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#define MG_DNS_A_RECORD 0x01     /* Lookup IP address */
+#define MG_DNS_CNAME_RECORD 0x05 /* Lookup CNAME */
+#define MG_DNS_PTR_RECORD 0x0c   /* Lookup PTR */
+#define MG_DNS_TXT_RECORD 0x10   /* Lookup TXT */
+#define MG_DNS_AAAA_RECORD 0x1c  /* Lookup IPv6 address */
+#define MG_DNS_SRV_RECORD 0x21   /* Lookup SRV */
+#define MG_DNS_MX_RECORD 0x0f    /* Lookup mail server for domain */
+#define MG_DNS_ANY_RECORD 0xff
+#define MG_DNS_NSEC_RECORD 0x2f
+
+#define MG_MAX_DNS_QUESTIONS 32
+#define MG_MAX_DNS_ANSWERS 32
+
+#define MG_DNS_MESSAGE 100 /* High-level DNS message event */
+
+enum mg_dns_resource_record_kind {
+  MG_DNS_INVALID_RECORD = 0,
+  MG_DNS_QUESTION,
+  MG_DNS_ANSWER
+};
+
+/* DNS resource record. */
+struct mg_dns_resource_record {
+  struct mg_str name; /* buffer with compressed name */
+  int rtype;
+  int rclass;
+  int ttl;
+  enum mg_dns_resource_record_kind kind;
+  struct mg_str rdata; /* protocol data (can be a compressed name) */
+};
+
+/* DNS message (request and response). */
+struct mg_dns_message {
+  struct mg_str pkt; /* packet body */
+  uint16_t flags;
+  uint16_t transaction_id;
+  int num_questions;
+  int num_answers;
+  struct mg_dns_resource_record questions[MG_MAX_DNS_QUESTIONS];
+  struct mg_dns_resource_record answers[MG_MAX_DNS_ANSWERS];
+};
+
+struct mg_dns_resource_record *mg_dns_next_record(
+    struct mg_dns_message *msg, int query, struct mg_dns_resource_record *prev);
+
+/*
+ * Parses the record data from a DNS resource record.
+ *
+ *  - A:     struct in_addr *ina
+ *  - AAAA:  struct in6_addr *ina
+ *  - CNAME: char buffer
+ *
+ * Returns -1 on error.
+ *
+ * TODO(mkm): MX
+ */
+int mg_dns_parse_record_data(struct mg_dns_message *msg,
+                             struct mg_dns_resource_record *rr, void *data,
+                             size_t data_len);
+
+/*
+ * Sends a DNS query to the remote end.
+ */
+void mg_send_dns_query(struct mg_connection *nc, const char *name,
+                       int query_type);
+
+/*
+ * Inserts a DNS header to an IO buffer.
+ *
+ * Returns the number of bytes inserted.
+ */
+int mg_dns_insert_header(struct mbuf *io, size_t pos,
+                         struct mg_dns_message *msg);
+
+/*
+ * Appends already encoded questions from an existing message.
+ *
+ * This is useful when generating a DNS reply message which includes
+ * all question records.
+ *
+ * Returns the number of appended bytes.
+ */
+int mg_dns_copy_questions(struct mbuf *io, struct mg_dns_message *msg);
+
+/*
+ * Encodes and appends a DNS resource record to an IO buffer.
+ *
+ * The record metadata is taken from the `rr` parameter, while the name and data
+ * are taken from the parameters, encoded in the appropriate format depending on
+ * record type and stored in the IO buffer. The encoded values might contain
+ * offsets within the IO buffer. It's thus important that the IO buffer doesn't
+ * get trimmed while a sequence of records are encoded while preparing a DNS
+ * reply.
+ *
+ * This function doesn't update the `name` and `rdata` pointers in the `rr`
+ * struct because they might be invalidated as soon as the IO buffer grows
+ * again.
+ *
+ * Returns the number of bytes appended or -1 in case of error.
+ */
+int mg_dns_encode_record(struct mbuf *io, struct mg_dns_resource_record *rr,
+                         const char *name, size_t nlen, const void *rdata,
+                         size_t rlen);
+
+/*
+ * Encodes a DNS name.
+ */
+int mg_dns_encode_name(struct mbuf *io, const char *name, size_t len);
+
+/* Low-level: parses a DNS response. */
+int mg_parse_dns(const char *buf, int len, struct mg_dns_message *msg);
+
+/*
+ * Uncompresses a DNS compressed name.
+ *
+ * The containing DNS message is required because of the compressed encoding
+ * and reference suffixes present elsewhere in the packet.
+ *
+ * If the name is less than `dst_len` characters long, the remainder
+ * of `dst` is terminated with `\0` characters. Otherwise, `dst` is not
+ * terminated.
+ *
+ * If `dst_len` is 0 `dst` can be NULL.
+ * Returns the uncompressed name length.
+ */
+size_t mg_dns_uncompress_name(struct mg_dns_message *msg, struct mg_str *name,
+                              char *dst, int dst_len);
+
+/*
+ * Attaches a built-in DNS event handler to the given listening connection.
+ *
+ * The DNS event handler parses the incoming UDP packets, treating them as DNS
+ * requests. If an incoming packet gets successfully parsed by the DNS event
+ * handler, a user event handler will receive an `MG_DNS_REQUEST` event, with
+ * `ev_data` pointing to the parsed `struct mg_dns_message`.
+ *
+ * See
+ * [captive_dns_server](https://github.com/cesanta/mongoose/tree/master/examples/captive_dns_server)
+ * example on how to handle DNS request and send DNS reply.
+ */
+void mg_set_protocol_dns(struct mg_connection *nc);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* CS_MONGOOSE_SRC_DNS_H_ */

src/dns_server.c

+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#if MG_ENABLE_DNS_SERVER
+
+#include "mongoose/src/internal.h"
+#include "mongoose/src/dns-server.h"
+
+struct mg_dns_reply mg_dns_create_reply(struct mbuf *io,
+                                        struct mg_dns_message *msg) {
+  struct mg_dns_reply rep;
+  rep.msg = msg;
+  rep.io = io;
+  rep.start = io->len;
+
+  /* reply + recursion allowed */
+  msg->flags |= 0x8080;
+  mg_dns_copy_questions(io, msg);
+
+  msg->num_answers = 0;
+  return rep;
+}
+
+void mg_dns_send_reply(struct mg_connection *nc, struct mg_dns_reply *r) {
+  size_t sent = r->io->len - r->start;
+  mg_dns_insert_header(r->io, r->start, r->msg);
+  if (!(nc->flags & MG_F_UDP)) {
+    uint16_t len = htons((uint16_t) sent);
+    mbuf_insert(r->io, r->start, &len, 2);
+  }
+
+  if (&nc->send_mbuf != r->io) {
+    mg_send(nc, r->io->buf + r->start, r->io->len - r->start);
+    r->io->len = r->start;
+  }
+}
+
+int mg_dns_reply_record(struct mg_dns_reply *reply,
+                        struct mg_dns_resource_record *question,
+                        const char *name, int rtype, int ttl, const void *rdata,
+                        size_t rdata_len) {
+  struct mg_dns_message *msg = (struct mg_dns_message *) reply->msg;
+  char rname[512];
+  struct mg_dns_resource_record *ans = &msg->answers[msg->num_answers];
+  if (msg->num_answers >= MG_MAX_DNS_ANSWERS) {
+    return -1; /* LCOV_EXCL_LINE */
+  }
+
+  if (name == NULL) {
+    name = rname;
+    rname[511] = 0;
+    mg_dns_uncompress_name(msg, &question->name, rname, sizeof(rname) - 1);
+  }
+
+  *ans = *question;
+  ans->kind = MG_DNS_ANSWER;
+  ans->rtype = rtype;
+  ans->ttl = ttl;
+
+  if (mg_dns_encode_record(reply->io, ans, name, strlen(name), rdata,
+                           rdata_len) == -1) {
+    return -1; /* LCOV_EXCL_LINE */
+  };
+
+  msg->num_answers++;
+  return 0;
+}
+
+#endif /* MG_ENABLE_DNS_SERVER */

src/dns_server.h

+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/*
+ * === DNS server API reference
+ *
+ * Disabled by default; enable with `-DMG_ENABLE_DNS_SERVER`.
+ */
+
+#ifndef CS_MONGOOSE_SRC_DNS_SERVER_H_
+#define CS_MONGOOSE_SRC_DNS_SERVER_H_
+
+#if MG_ENABLE_DNS_SERVER
+
+#include "mongoose/src/dns.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#define MG_DNS_SERVER_DEFAULT_TTL 3600
+
+struct mg_dns_reply {
+  struct mg_dns_message *msg;
+  struct mbuf *io;
+  size_t start;
+};
+
+/*
+ * Creates a DNS reply.
+ *
+ * The reply will be based on an existing query message `msg`.
+ * The query body will be appended to the output buffer.
+ * "reply + recursion allowed" will be added to the message flags and the
+ * message's num_answers will be set to 0.
+ *
+ * Answer records can be appended with `mg_dns_send_reply` or by lower
+ * level function defined in the DNS API.
+ *
+ * In order to send a reply use `mg_dns_send_reply`.
+ * It's possible to use a connection's send buffer as reply buffer,
+ * and it will work for both UDP and TCP connections.
+ *
+ * Example:
+ *
+ * ```c
+ * reply = mg_dns_create_reply(&nc->send_mbuf, msg);
+ * for (i = 0; i < msg->num_questions; i++) {
+ *   rr = &msg->questions[i];
+ *   if (rr->rtype == MG_DNS_A_RECORD) {
+ *     mg_dns_reply_record(&reply, rr, 3600, &dummy_ip_addr, 4);
+ *   }
+ * }
+ * mg_dns_send_reply(nc, &reply);
+ * ```
+ */
+struct mg_dns_reply mg_dns_create_reply(struct mbuf *io,
+                                        struct mg_dns_message *msg);
+
+/*
+ * Appends a DNS reply record to the IO buffer and to the DNS message.
+ *
+ * The message's num_answers field will be incremented. It's the caller's duty
+ * to ensure num_answers is properly initialised.
+ *
+ * Returns -1 on error.
+ */
+int mg_dns_reply_record(struct mg_dns_reply *reply,
+                        struct mg_dns_resource_record *question,
+                        const char *name, int rtype, int ttl, const void *rdata,
+                        size_t rdata_len);
+
+/*
+ * Sends a DNS reply through a connection.
+ *
+ * The DNS data is stored in an IO buffer pointed by reply structure in `r`.
+ * This function mutates the content of that buffer in order to ensure that
+ * the DNS header reflects the size and flags of the message, that might have
+ * been updated either with `mg_dns_reply_record` or by direct manipulation of
+ * `r->message`.
+ *
+ * Once sent, the IO buffer will be trimmed unless the reply IO buffer
+ * is the connection's send buffer and the connection is not in UDP mode.
+ */
+void mg_dns_send_reply(struct mg_connection *nc, struct mg_dns_reply *r);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* MG_ENABLE_DNS_SERVER */
+#endif /* CS_MONGOOSE_SRC_DNS_SERVER_H_ */

src/features.h

+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_MONGOOSE_SRC_FEATURES_H_
+#define CS_MONGOOSE_SRC_FEATURES_H_
+
+#ifndef MG_DISABLE_HTTP_DIGEST_AUTH
+#define MG_DISABLE_HTTP_DIGEST_AUTH 0
+#endif
+
+#ifndef MG_DISABLE_HTTP_KEEP_ALIVE
+#define MG_DISABLE_HTTP_KEEP_ALIVE 0
+#endif
+
+#ifndef MG_DISABLE_PFS
+#define MG_DISABLE_PFS 0
+#endif
+
+#ifndef MG_DISABLE_WS_RANDOM_MASK
+#define MG_DISABLE_WS_RANDOM_MASK 0
+#endif
+
+#ifndef MG_ENABLE_ASYNC_RESOLVER
+#define MG_ENABLE_ASYNC_RESOLVER 1
+#endif
+
+#ifndef MG_ENABLE_BROADCAST
+#define MG_ENABLE_BROADCAST 0
+#endif
+
+#ifndef MG_ENABLE_COAP
+#define MG_ENABLE_COAP 0
+#endif
+
+#ifndef MG_ENABLE_DEBUG
+#define MG_ENABLE_DEBUG 0
+#endif
+
+#ifndef MG_ENABLE_DIRECTORY_LISTING
+#define MG_ENABLE_DIRECTORY_LISTING 0
+#endif
+
+#ifndef MG_ENABLE_DNS
+#define MG_ENABLE_DNS 1
+#endif
+
+#ifndef MG_ENABLE_DNS_SERVER
+#define MG_ENABLE_DNS_SERVER 0
+#endif
+
+#ifndef MG_ENABLE_FAKE_DAVLOCK
+#define MG_ENABLE_FAKE_DAVLOCK 0
+#endif
+
+#ifndef MG_ENABLE_FILESYSTEM
+#define MG_ENABLE_FILESYSTEM 0
+#endif
+
+#ifndef MG_ENABLE_GETADDRINFO
+#define MG_ENABLE_GETADDRINFO 0
+#endif
+
+#ifndef MG_ENABLE_HEXDUMP
+#define MG_ENABLE_HEXDUMP CS_ENABLE_STDIO
+#endif
+
+#ifndef MG_ENABLE_HTTP
+#define MG_ENABLE_HTTP 1
+#endif
+
+#ifndef MG_ENABLE_HTTP_CGI
+#define MG_ENABLE_HTTP_CGI 0
+#endif
+
+#ifndef MG_ENABLE_HTTP_SSI
+#define MG_ENABLE_HTTP_SSI MG_ENABLE_FILESYSTEM
+#endif
+
+#ifndef MG_ENABLE_HTTP_SSI_EXEC
+#define MG_ENABLE_HTTP_SSI_EXEC 0
+#endif
+
+#ifndef MG_ENABLE_HTTP_STREAMING_MULTIPART
+#define MG_ENABLE_HTTP_STREAMING_MULTIPART 0
+#endif
+
+#ifndef MG_ENABLE_HTTP_WEBDAV
+#define MG_ENABLE_HTTP_WEBDAV 0
+#endif
+
+#ifndef MG_ENABLE_HTTP_WEBSOCKET
+#define MG_ENABLE_HTTP_WEBSOCKET MG_ENABLE_HTTP
+#endif
+
+#ifndef MG_ENABLE_IPV6
+#define MG_ENABLE_IPV6 0
+#endif
+
+#ifndef MG_ENABLE_MQTT
+#define MG_ENABLE_MQTT 1
+#endif
+
+#ifndef MG_ENABLE_SOCKS
+#define MG_ENABLE_SOCKS 0
+#endif
+
+#ifndef MG_ENABLE_MQTT_BROKER
+#define MG_ENABLE_MQTT_BROKER 0
+#endif
+
+#ifndef MG_ENABLE_SSL
+#define MG_ENABLE_SSL 0
+#endif
+
+#ifndef MG_ENABLE_SYNC_RESOLVER
+#define MG_ENABLE_SYNC_RESOLVER 0
+#endif
+
+#ifndef MG_ENABLE_STDIO
+#define MG_ENABLE_STDIO CS_ENABLE_STDIO
+#endif
+
+#ifndef MG_NET_IF
+#define MG_NET_IF MG_NET_IF_SOCKET
+#endif
+
+#ifndef MG_SSL_IF
+#define MG_SSL_IF MG_SSL_IF_OPENSSL
+#endif
+
+#ifndef MG_ENABLE_THREADS /* ifdef-ok */
+#ifdef _WIN32
+#define MG_ENABLE_THREADS 1
+#else
+#define MG_ENABLE_THREADS 0
+#endif
+#endif
+
+#if MG_ENABLE_DEBUG && !defined(CS_ENABLE_DEBUG)
+#define CS_ENABLE_DEBUG 1
+#endif
+
+/* MQTT broker requires MQTT */
+#if MG_ENABLE_MQTT_BROKER && !MG_ENABLE_MQTT
+#undef MG_ENABLE_MQTT
+#define MG_ENABLE_MQTT 1
+#endif
+
+#ifndef MG_ENABLE_HTTP_URL_REWRITES
+#define MG_ENABLE_HTTP_URL_REWRITES \
+  (CS_PLATFORM == CS_P_WINDOWS || CS_PLATFORM == CS_P_UNIX)
+#endif
+
+#ifndef MG_ENABLE_TUN
+#define MG_ENABLE_TUN MG_ENABLE_HTTP_WEBSOCKET
+#endif
+
+#ifndef MG_ENABLE_SNTP
+#define MG_ENABLE_SNTP 0
+#endif
+
+#ifndef MG_ENABLE_EXTRA_ERRORS_DESC
+#define MG_ENABLE_EXTRA_ERRORS_DESC 0
+#endif
+
+#ifndef MG_ENABLE_CALLBACK_USERDATA
+#define MG_ENABLE_CALLBACK_USERDATA 0
+#endif
+
+#if MG_ENABLE_CALLBACK_USERDATA
+#define MG_UD_ARG(ud) , ud
+#define MG_CB(cb, ud) cb, ud
+#else
+#define MG_UD_ARG(ud)
+#define MG_CB(cb, ud) cb
+#endif
+
+#endif /* CS_MONGOOSE_SRC_FEATURES_H_ */

src/mqtt_client.h

+/*
+ * === API reference
+ */
+
+#ifndef CS_MONGOOSE_SRC_MQTT_CLIENT_H_
+#define CS_MONGOOSE_SRC_MQTT_CLIENT_H_
+
+#endif /* CS_MONGOOSE_SRC_MQTT_CLIENT_H_ */

src/net_if_socket.h

+/*
+ * Copyright (c) 2014-2016 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_MONGOOSE_SRC_NET_IF_SOCKET_H_
+#define CS_MONGOOSE_SRC_NET_IF_SOCKET_H_
+
+#include "mongoose/src/net_if.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#ifndef MG_ENABLE_NET_IF_SOCKET
+#define MG_ENABLE_NET_IF_SOCKET MG_NET_IF == MG_NET_IF_SOCKET
+#endif
+
+extern const struct mg_iface_vtable mg_socket_iface_vtable;
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* CS_MONGOOSE_SRC_NET_IF_SOCKET_H_ */

test/ccgi-1.2/.clang-format

+DisableFormat: true

test/ccgi-1.2/README

+You may need to edit Makefile and t/Makefile to specify where
+your openssl include files and libraries are located.  To build
+without openssl see the comments in Makefile.
+
+To build: make
+
+To test:  make test  (requires openssl)
+
+To install:
+  copy libccgi.a to a lib directory such as /usr/local/lib
+  copy ccgi.h to an include directory such as /usr/local/include

test/data/auth/a.txt

+hi