path: root/librabbitmq/amqp_private.h

/* vim:set ft=c ts=2 sw=2 sts=2 et cindent: */
#ifndef librabbitmq_amqp_private_h
#define librabbitmq_amqp_private_h

/*
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MIT
 *
 * Portions created by Alan Antonuk are Copyright (c) 2012-2013
 * Alan Antonuk. All Rights Reserved.
 *
 * Portions created by VMware are Copyright (c) 2007-2012 VMware, Inc.
 * All Rights Reserved.
 *
 * Portions created by Tony Garnock-Jones are Copyright (c) 2009-2010
 * VMware, Inc. and Tony Garnock-Jones. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * ***** END LICENSE BLOCK *****
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "amqp.h"
#include "amqp_framing.h"
#include <string.h>

#ifdef _WIN32
# include <Winsock2.h>
#else
# include <arpa/inet.h>
#endif

/* GCC attributes */
#if __GNUC__ > 2 | (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
#define AMQP_NORETURN \
  __attribute__ ((__noreturn__))
#define AMQP_UNUSED \
  __attribute__ ((__unused__))
#else
#define AMQP_NORETURN
#define AMQP_UNUSED
#endif

#if __GNUC__ >= 4
#define AMQP_PRIVATE \
  __attribute__ ((visibility ("hidden")))
#else
#define AMQP_PRIVATE
#endif

char *
amqp_os_error_string(int err);

#ifdef WITH_SSL
char *
amqp_ssl_error_string(int err);
#endif

#include "amqp_socket.h"

/*
 * Connection states: XXX FIX THIS
 *
 * - CONNECTION_STATE_INITIAL: The initial state, when we cannot be
 *   sure if the next thing we will get is the first AMQP frame, or a
 *   protocol header from the server.
 *
 * - CONNECTION_STATE_IDLE: The normal state between
 *   frames. Connections may only be reconfigured, and the
 *   connection's pools recycled, when in this state. Whenever we're
 *   in this state, the inbound_buffer's bytes pointer must be NULL;
 *   any other state, and it must point to a block of memory allocated
 *   from the frame_pool.
 *
 * - CONNECTION_STATE_HEADER: Some bytes of an incoming frame have
 *   been seen, but not a complete frame header's worth.
 *
 * - CONNECTION_STATE_BODY: A complete frame header has been seen, but
 *   the frame is not yet complete. When it is completed, it will be
 *   returned, and the connection will return to IDLE state.
 *
 */
typedef enum amqp_connection_state_enum_ {
  CONNECTION_STATE_IDLE = 0,
  CONNECTION_STATE_INITIAL,
  CONNECTION_STATE_HEADER,
  CONNECTION_STATE_BODY
} amqp_connection_state_enum;

/* 7 bytes up front, then payload, then 1 byte footer */
#define HEADER_SIZE 7
#define FOOTER_SIZE 1

#define AMQP_PSEUDOFRAME_PROTOCOL_HEADER 'A'

typedef struct amqp_link_t_ {
  struct amqp_link_t_ *next;
  void *data;
} amqp_link_t;

#define POOL_TABLE_SIZE 16

typedef struct amqp_pool_table_entry_t_ {
  struct amqp_pool_table_entry_t_ *next;
  amqp_pool_t pool;
  amqp_channel_t channel;
} amqp_pool_table_entry_t;

struct amqp_connection_state_t_ {
  amqp_pool_table_entry_t *pool_table[POOL_TABLE_SIZE];

  amqp_connection_state_enum state;

  int channel_max;
  int frame_max;
  int heartbeat;

  /* buffer for holding frame headers.  Allows us to delay allocating
   * the raw frame buffer until the type, channel, and size are all known
   */
  char header_buffer[HEADER_SIZE + 1];
  amqp_bytes_t inbound_buffer;

  size_t inbound_offset;
  size_t target_size;

  amqp_bytes_t outbound_buffer;

  amqp_socket_t *socket;

  amqp_bytes_t sock_inbound_buffer;
  size_t sock_inbound_offset;
  size_t sock_inbound_limit;

  amqp_link_t *first_queued_frame;
  amqp_link_t *last_queued_frame;

  amqp_rpc_reply_t most_recent_api_result;

  uint64_t next_recv_heartbeat;
  uint64_t next_send_heartbeat;
};

amqp_pool_t *amqp_get_or_create_channel_pool(amqp_connection_state_t connection, amqp_channel_t channel);
amqp_pool_t *amqp_get_channel_pool(amqp_connection_state_t state, amqp_channel_t channel);

int amqp_try_recv(amqp_connection_state_t state, uint64_t current_time);

static inline void *amqp_offset(void *data, size_t offset)
{
  return (char *)data + offset;
}

/* This macro defines the encoding and decoding functions associated with a
   simple type. */

#define DECLARE_CODEC_BASE_TYPE(bits, htonx, ntohx)                           \
                                                                              \
  static inline void amqp_e##bits(void *data, size_t offset,                  \
                                  uint##bits##_t val)                         \
  {                                                                           \
    /* The AMQP data might be unaligned. So we encode and then copy the       \
             result into place. */                                            \
    uint##bits##_t res = htonx(val);                                          \
    memcpy(amqp_offset(data, offset), &res, bits/8);                          \
  }                                                                           \
                                                                              \
  static inline uint##bits##_t amqp_d##bits(void *data, size_t offset)        \
  {                                                                           \
    /* The AMQP data might be unaligned.  So we copy the source value         \
             into a variable and then decode it. */                           \
    uint##bits##_t val;                                                       \
    memcpy(&val, amqp_offset(data, offset), bits/8);                          \
    return ntohx(val);                                                        \
  }                                                                           \
                                                                              \
  static inline int amqp_encode_##bits(amqp_bytes_t encoded, size_t *offset,  \
                                       uint##bits##_t input)                  \
                                                                              \
  {                                                                           \
    size_t o = *offset;                                                       \
    if ((*offset = o + bits / 8) <= encoded.len) {                            \
      amqp_e##bits(encoded.bytes, o, input);                                  \
      return 1;                                                               \
    }                                                                         \
    else {                                                                    \
      return 0;                                                               \
    }                                                                         \
  }                                                                           \
                                                                              \
  static inline int amqp_decode_##bits(amqp_bytes_t encoded, size_t *offset,  \
                                       uint##bits##_t *output)                \
                                                                              \
  {                                                                           \
    size_t o = *offset;                                                       \
    if ((*offset = o + bits / 8) <= encoded.len) {                            \
      *output = amqp_d##bits(encoded.bytes, o);                               \
      return 1;                                                               \
    }                                                                         \
    else {                                                                    \
      return 0;                                                               \
    }                                                                         \
  }

/* Determine byte order */
#if defined(__GLIBC__)
# include <endian.h>
# if (__BYTE_ORDER == __LITTLE_ENDIAN)
#  define AMQP_LITTLE_ENDIAN
# elif (__BYTE_ORDER == __BIG_ENDIAN)
#  define AMQP_BIG_ENDIAN
# else
/* Don't define anything */
# endif
#elif defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN) ||                   \
      defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__)
# define AMQP_BIG_ENDIAN
#elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN) ||                   \
      defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)
# define AMQP_LITTLE_ENDIAN
#elif defined(__hppa__) || defined(__HPPA__) || defined(__hppa) ||          \
      defined(_POWER) || defined(__powerpc__) || defined(__ppc___) ||       \
      defined(_MIPSEB) || defined(__s390__) ||                              \
      defined(__sparc) || defined(__sparc__)
# define AMQP_BIG_ENDIAN
#elif defined(__alpha__) || defined(__alpha) || defined(_M_ALPHA) ||        \
      defined(__amd64__) || defined(__x86_64__) || defined(_M_X64) ||       \
      defined(__ia64) || defined(__ia64__) || defined(_M_IA64) ||           \
      defined(__arm__) || defined(_M_ARM) ||                                \
      defined(__i386__) || defined(_M_IX86)
# define AMQP_LITTLE_ENDIAN
#else
/* Don't define anything */
#endif

#if defined(AMQP_LITTLE_ENDIAN)

#define DECLARE_XTOXLL(func)                        \
  static inline uint64_t func##ll(uint64_t val)     \
  {                                                 \
    union {                                         \
      uint64_t whole;                               \
      uint32_t halves[2];                           \
    } u;                                            \
    uint32_t t;                                     \
    u.whole = val;                                  \
    t = u.halves[0];                                \
    u.halves[0] = func##l(u.halves[1]);             \
    u.halves[1] = func##l(t);                       \
    return u.whole;                                 \
  }

#elif defined(AMQP_BIG_ENDIAN)

#define DECLARE_XTOXLL(func)                        \
  static inline uint64_t func##ll(uint64_t val)     \
  {                                                 \
    union {                                         \
      uint64_t whole;                               \
      uint32_t halves[2];                           \
    } u;                                            \
    u.whole = val;                                  \
    u.halves[0] = func##l(u.halves[0]);             \
    u.halves[1] = func##l(u.halves[1]);             \
    return u.whole;                                 \
  }

#else
# error Endianness not known
#endif

#ifndef HAVE_HTONLL
DECLARE_XTOXLL(hton)
DECLARE_XTOXLL(ntoh)
#endif

DECLARE_CODEC_BASE_TYPE(8, (uint8_t), (uint8_t))
DECLARE_CODEC_BASE_TYPE(16, htons, ntohs)
DECLARE_CODEC_BASE_TYPE(32, htonl, ntohl)
DECLARE_CODEC_BASE_TYPE(64, htonll, ntohll)

static inline int amqp_encode_bytes(amqp_bytes_t encoded, size_t *offset,
                                    amqp_bytes_t input)
{
  size_t o = *offset;
  if ((*offset = o + input.len) <= encoded.len) {
    memcpy(amqp_offset(encoded.bytes, o), input.bytes, input.len);
    return 1;
  } else {
    return 0;
  }
}

static inline int amqp_decode_bytes(amqp_bytes_t encoded, size_t *offset,
                                    amqp_bytes_t *output, size_t len)
{
  size_t o = *offset;
  if ((*offset = o + len) <= encoded.len) {
    output->bytes = amqp_offset(encoded.bytes, o);
    output->len = len;
    return 1;
  } else {
    return 0;
  }
}

AMQP_NORETURN
void
amqp_abort(const char *fmt, ...);

#endif