src/socket.c

   1 /*
   2  * Copyright (C) 2000-2012 Free Software Foundation, Inc.
   3  *
   4  * This file is part of GnuTLS.
   5  *
   6  * GnuTLS is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GnuTLS is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21
  22 #if HAVE_SYS_SOCKET_H
  23 # include <sys/socket.h>
  24 #elif HAVE_WS2TCPIP_H
  25 # include <ws2tcpip.h>
  26 #endif
  27 #include <netdb.h>
  28 #include <string.h>
  29 #include <errno.h>
  30 #include <sys/select.h>
  31 #include <sys/types.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <unistd.h>
  35 #ifndef _WIN32
  36 # include <signal.h>
  37 #endif
  38 #include <socket.h>
  39 #include "sockets.h"
  40
  41 #define MAX_BUF 4096
  42
  43 extern unsigned int verbose;
  44 /* Functions to manipulate sockets
  45  */
  46
  47 ssize_t
  48 socket_recv (const socket_st * socket, void *buffer, int buffer_size)
  49 {
  50   int ret;
  51
  52   if (socket->secure)
  53     {
  54       do
  55         {
  56           ret = gnutls_record_recv (socket->session, buffer, buffer_size);
  57           if (ret == GNUTLS_E_HEARTBEAT_PING_RECEIVED)
  58             gnutls_heartbeat_pong(socket->session, 0);
  59         }
  60       while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_HEARTBEAT_PING_RECEIVED);
  61
  62     }
  63   else
  64     do
  65       {
  66         ret = recv (socket->fd, buffer, buffer_size, 0);
  67       }
  68     while (ret == -1 && errno == EINTR);
  69
  70   return ret;
  71 }
  72
  73 ssize_t
  74 socket_send (const socket_st * socket, const void *buffer, int buffer_size)
  75 {
  76   int ret;
  77
  78   if (socket->secure)
  79     do
  80       {
  81         ret = gnutls_record_send (socket->session, buffer, buffer_size);
  82       }
  83     while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
  84   else
  85     do
  86       {
  87         ret = send (socket->fd, buffer, buffer_size, 0);
  88       }
  89     while (ret == -1 && errno == EINTR);
  90
  91   if (ret > 0 && ret != buffer_size && verbose)
  92     fprintf (stderr,
  93              "*** Only sent %d bytes instead of %d.\n", ret, buffer_size);
  94
  95   return ret;
  96 }
  97
  98 void
  99 socket_bye (socket_st * socket)
 100 {
 101   int ret;
 102   if (socket->secure)
 103     {
 104       do
 105         ret = gnutls_bye (socket->session, GNUTLS_SHUT_WR);
 106       while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
 107       if (ret < 0)
 108         fprintf (stderr, "*** gnutls_bye() error: %s\n",
 109                  gnutls_strerror (ret));
 110       gnutls_deinit (socket->session);
 111       socket->session = NULL;
 112     }
 113
 114   freeaddrinfo (socket->addr_info);
 115   socket->addr_info = socket->ptr = NULL;
 116
 117   free (socket->ip);
 118   free (socket->hostname);
 119   free (socket->service);
 120
 121   shutdown (socket->fd, SHUT_RDWR);     /* no more receptions */
 122   close (socket->fd);
 123
 124   socket->fd = -1;
 125   socket->secure = 0;
 126 }
 127
 128 void
 129 socket_open (socket_st * hd, const char *hostname, const char *service, int udp)
 130 {
 131   struct addrinfo hints, *res, *ptr;
 132   int sd, err;
 133   char buffer[MAX_BUF + 1];
 134   char portname[16] = { 0 };
 135
 136   printf ("Resolving '%s'...\n", hostname);
 137   /* get server name */
 138   memset (&hints, 0, sizeof (hints));
 139   hints.ai_socktype = udp ? SOCK_DGRAM : SOCK_STREAM;
 140   if ((err = getaddrinfo (hostname, service, &hints, &res)))
 141     {
 142       fprintf (stderr, "Cannot resolve %s:%s: %s\n", hostname, service,
 143                gai_strerror (err));
 144       exit (1);
 145     }
 146
 147   sd = -1;
 148   for (ptr = res; ptr != NULL; ptr = ptr->ai_next)
 149     {
 150       sd = socket (ptr->ai_family, ptr->ai_socktype, ptr->ai_protocol);
 151       if (sd == -1)
 152         continue;
 153
 154       if ((err = getnameinfo (ptr->ai_addr, ptr->ai_addrlen, buffer, MAX_BUF,
 155                               portname, sizeof (portname),
 156                               NI_NUMERICHOST | NI_NUMERICSERV)) != 0)
 157         {
 158           fprintf (stderr, "getnameinfo(): %s\n", gai_strerror (err));
 159           continue;
 160         }
 161
 162       if (hints.ai_socktype == SOCK_DGRAM)
 163         {
 164 #if defined(IP_DONTFRAG)
 165           int yes = 1;
 166           if (setsockopt (sd, IPPROTO_IP, IP_DONTFRAG,
 167                         (const void *) &yes, sizeof (yes)) < 0)
 168             perror ("setsockopt(IP_DF) failed");
 169 #elif defined(IP_MTU_DISCOVER)
 170           int yes = IP_PMTUDISC_DO;
 171           if (setsockopt(sd, IPPROTO_IP, IP_MTU_DISCOVER,
 172                          (const void*) &yes, sizeof (yes)) < 0)
 173             perror ("setsockopt(IP_DF) failed");
 174 #endif
 175         }
 176
 177
 178       printf ("Connecting to '%s:%s'...\n", buffer, portname);
 179
 180       err = connect (sd, ptr->ai_addr, ptr->ai_addrlen);
 181       if (err < 0)
 182         {
 183           fprintf (stderr, "Cannot connect to %s:%s: %s\n", buffer,
 184                    portname, strerror (errno));
 185           continue;
 186         }
 187       break;
 188     }
 189
 190   if (err != 0)
 191     exit(1);
 192
 193   if (sd == -1)
 194     {
 195       fprintf (stderr, "Could not find a supported socket\n");
 196       exit (1);
 197     }
 198
 199   hd->secure = 0;
 200   hd->fd = sd;
 201   hd->hostname = strdup (hostname);
 202   hd->ip = strdup (buffer);
 203   hd->service = strdup (portname);
 204   hd->ptr = ptr;
 205   hd->addr_info = res;
 206
 207   return;
 208 }
 209
 210 void
 211 sockets_init (void)
 212 {
 213 #ifdef _WIN32
 214     WORD wVersionRequested;
 215     WSADATA wsaData;
 216
 217     wVersionRequested = MAKEWORD (1, 1);
 218     if (WSAStartup (wVersionRequested, &wsaData) != 0)
 219       {
 220           perror ("WSA_STARTUP_ERROR");
 221       }
 222 #else
 223   signal (SIGPIPE, SIG_IGN);
 224 #endif
 225
 226 }