Source/charon/network/socket.c

   1 /**
   2  * @file socket.c
   3  *
   4  * @brief management of sockets
   5  *
   6  * receiver reads from here, sender writes to here
   7  *
   8  */
   9
  10 /*
  11  * Copyright (C) 2005 Jan Hutter, Martin Willi
  12  * Hochschule fuer Technik Rapperswil
  13  *
  14  * This program is free software; you can redistribute it and/or modify it
  15  * under the terms of the GNU General Public License as published by the
  16  * Free Software Foundation; either version 2 of the License, or (at your
  17  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  18  *
  19  * This program is distributed in the hope that it will be useful, but
  20  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  21  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  22  * for more details.
  23  */
  24
  25 #include <pthread.h>
  26 #include <sys/types.h>
  27 #include <sys/socket.h>
  28 #include <string.h>
  29 #include <errno.h>
  30 #include <unistd.h>
  31 #include <stdlib.h>
  32
  33 #include "socket.h"
  34
  35 #include <globals.h>
  36 #include <utils/allocator.h>
  37 #include <utils/logger_manager.h>
  38
  39 typedef struct private_socket_s private_socket_t;
  40
  41 struct private_socket_s{
  42         /**
  43          * public functions
  44          */
  45          socket_t public;
  46
  47          /**
  48           * currently we only have one socket, maybe more in the future ?
  49           */
  50          int socket_fd;
  51          /**
  52           * logger for this socket
  53           */
  54          logger_t *logger;
  55 };
  56
  57 /**
  58  * implementation of socket_t.receive
  59  */
  60 status_t receiver(private_socket_t *this, packet_t **packet)
  61 {
  62         char buffer[MAX_PACKET];
  63         int oldstate;
  64         packet_t *pkt = packet_create();
  65
  66         /* add packet destroy handler for cancellation, enable cancellation */
  67         pthread_cleanup_push((void(*)(void*))pkt->destroy, (void*)pkt);
  68         pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldstate);
  69
  70         pkt->source = host_create(AF_INET, "0.0.0.0", 0);
  71         pkt->destination = host_create(AF_INET, "0.0.0.0", 0);
  72
  73
  74         this->logger->log(this->logger, CONTROL|MORE, "going to read from socket");
  75         /* do the read */
  76         pkt->data.len = recvfrom(this->socket_fd, buffer, MAX_PACKET, 0,
  77                                                         pkt->source->get_sockaddr(pkt->source),
  78                                                         pkt->source->get_sockaddr_len(pkt->source));
  79
  80         /* reset cancellation, remove packet destroy handler (without executing) */
  81         pthread_setcancelstate(oldstate, NULL);
  82         pthread_cleanup_pop(0);
  83
  84
  85         /* TODO: get senders destination address, using
  86          * IP_PKTINFO and recvmsg */
  87
  88         if (pkt->data.len < 0)
  89         {
  90                 pkt->destroy(pkt);
  91                 this->logger->log(this->logger, ERROR, "error reading from socket: %s", strerror(errno));
  92                 return FAILED;
  93         }
  94
  95         this->logger->log(this->logger, CONTROL, "received packet from %s:%d",
  96                                                 pkt->source->get_address(pkt->source),
  97                                                 pkt->source->get_port(pkt->source));
  98
  99         /* fill in packet */
 100         pkt->data.ptr = allocator_alloc(pkt->data.len);
 101         memcpy(pkt->data.ptr, buffer, pkt->data.len);
 102
 103         /* return packet */
 104         *packet = pkt;
 105
 106         return SUCCESS;
 107 }
 108
 109 /**
 110  * implementation of socket_t.send
 111  */
 112 status_t sender(private_socket_t *this, packet_t *packet)
 113 {
 114         ssize_t bytes_sent;
 115
 116
 117         this->logger->log(this->logger, CONTROL, "sending packet to %s:%d",
 118                                                 packet->destination->get_address(packet->destination),
 119                                                 packet->destination->get_port(packet->destination));
 120         /* send data */
 121         bytes_sent = sendto(this->socket_fd, packet->data.ptr, packet->data.len,
 122                                                 0, packet->destination->get_sockaddr(packet->destination),
 123                                                 *(packet->destination->get_sockaddr_len(packet->destination)));
 124
 125         if (bytes_sent != packet->data.len)
 126         {
 127                 this->logger->log(this->logger, ERROR, "error writing to socket: %s", strerror(errno));
 128                 return FAILED;
 129         }
 130         return SUCCESS;
 131 }
 132
 133 /**
 134  * implementation of socket_t.destroy
 135  */
 136 status_t destroy(private_socket_t *this)
 137 {
 138         close(this->socket_fd);
 139         global_logger_manager->destroy_logger(global_logger_manager, this->logger);
 140         allocator_free(this);
 141
 142         return SUCCESS;
 143 }
 144
 145 socket_t *socket_create(u_int16_t port)
 146 {
 147         private_socket_t *this = allocator_alloc_thing(private_socket_t);
 148         struct sockaddr_in addr;
 149
 150         /* public functions */
 151         this->public.send = (status_t(*)(socket_t*, packet_t*))sender;
 152         this->public.receive = (status_t(*)(socket_t*, packet_t**))receiver;
 153         this->public.destroy = (status_t(*)(socket_t*))destroy;
 154
 155
 156         this->logger = global_logger_manager->create_logger(global_logger_manager, SOCKET, NULL);
 157         if (this->logger == NULL)
 158         {
 159                 allocator_free(this);
 160                 return NULL;
 161         }
 162
 163         /* create default ipv4 socket */
 164         this->socket_fd = socket(PF_INET, SOCK_DGRAM, 0);
 165         if (this->socket_fd < 0)
 166         {
 167                 this->logger->log(this->logger, ERROR, "unable to open socket: %s", strerror(errno));
 168                 global_logger_manager->destroy_logger(global_logger_manager, this->logger);
 169                 allocator_free(this);
 170                 return NULL;
 171         }
 172
 173         /* bind socket to all interfaces */
 174         addr.sin_family = AF_INET;
 175     addr.sin_addr.s_addr = INADDR_ANY;
 176     addr.sin_port = htons(port);
 177     if (bind(this->socket_fd,(struct sockaddr*)&addr, sizeof(addr)) < 0)
 178     {
 179                 this->logger->log(this->logger, ERROR, "unable to bind socket to port %d: %s", port, strerror(errno));
 180                 global_logger_manager->destroy_logger(global_logger_manager, this->logger);
 181                 allocator_free(this);
 182         return NULL;
 183     }
 184
 185         return (socket_t*)this;
 186 }