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     do
  54       {
  55         ret = gnutls_record_recv (socket->session, buffer, buffer_size);
  56       }
  57     while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
  58   else
  59     do
  60       {
  61         ret = recv (socket->fd, buffer, buffer_size, 0);
  62       }
  63     while (ret == -1 && errno == EINTR);
  64
  65   return ret;
  66 }
  67
  68 ssize_t
  69 socket_send (const socket_st * socket, const void *buffer, int buffer_size)
  70 {
  71   int ret;
  72
  73   if (socket->secure)
  74     do
  75       {
  76         ret = gnutls_record_send (socket->session, buffer, buffer_size);
  77       }
  78     while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
  79   else
  80     do
  81       {
  82         ret = send (socket->fd, buffer, buffer_size, 0);
  83       }
  84     while (ret == -1 && errno == EINTR);
  85
  86   if (ret > 0 && ret != buffer_size && verbose)
  87     fprintf (stderr,
  88              "*** Only sent %d bytes instead of %d.\n", ret, buffer_size);
  89
  90   return ret;
  91 }
  92
  93 void
  94 socket_bye (socket_st * socket)
  95 {
  96   int ret;
  97   if (socket->secure)
  98     {
  99       do
 100         ret = gnutls_bye (socket->session, GNUTLS_SHUT_WR);
 101       while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
 102       if (ret < 0)
 103         fprintf (stderr, "*** gnutls_bye() error: %s\n",
 104                  gnutls_strerror (ret));
 105       gnutls_deinit (socket->session);
 106       socket->session = NULL;
 107     }
 108
 109   freeaddrinfo (socket->addr_info);
 110   socket->addr_info = socket->ptr = NULL;
 111
 112   free (socket->ip);
 113   free (socket->hostname);
 114   free (socket->service);
 115
 116   shutdown (socket->fd, SHUT_RDWR);     /* no more receptions */
 117   close (socket->fd);
 118
 119   socket->fd = -1;
 120   socket->secure = 0;
 121 }
 122
 123 void
 124 socket_connect (const socket_st * hd)
 125 {
 126   int err;
 127
 128   printf ("Connecting to '%s:%s'...\n", hd->ip, hd->service);
 129
 130   err = connect (hd->fd, hd->ptr->ai_addr, hd->ptr->ai_addrlen);
 131   if (err < 0)
 132     {
 133       fprintf (stderr, "Cannot connect to %s:%s: %s\n", hd->hostname,
 134                hd->service, strerror (errno));
 135       exit (1);
 136     }
 137 }
 138
 139 void
 140 socket_open (socket_st * hd, const char *hostname, const char *service, int udp)
 141 {
 142   struct addrinfo hints, *res, *ptr;
 143   int sd, err;
 144   char buffer[MAX_BUF + 1];
 145   char portname[16] = { 0 };
 146
 147   printf ("Resolving '%s'...\n", hostname);
 148   /* get server name */
 149   memset (&hints, 0, sizeof (hints));
 150   hints.ai_socktype = udp ? SOCK_DGRAM : SOCK_STREAM;
 151   if ((err = getaddrinfo (hostname, service, &hints, &res)))
 152     {
 153       fprintf (stderr, "Cannot resolve %s:%s: %s\n", hostname, service,
 154                gai_strerror (err));
 155       exit (1);
 156     }
 157
 158   sd = -1;
 159   for (ptr = res; ptr != NULL; ptr = ptr->ai_next)
 160     {
 161       sd = socket (ptr->ai_family, ptr->ai_socktype, ptr->ai_protocol);
 162       if (sd == -1)
 163         continue;
 164
 165       if ((err = getnameinfo (ptr->ai_addr, ptr->ai_addrlen, buffer, MAX_BUF,
 166                               portname, sizeof (portname),
 167                               NI_NUMERICHOST | NI_NUMERICSERV)) != 0)
 168         {
 169           fprintf (stderr, "getnameinfo(): %s\n", gai_strerror (err));
 170           freeaddrinfo (res);
 171           exit (1);
 172         }
 173
 174       break;
 175     }
 176
 177   if (sd == -1)
 178     {
 179       fprintf (stderr, "socket(): %s\n", strerror (errno));
 180       exit (1);
 181     }
 182
 183   if (hints.ai_socktype == SOCK_DGRAM)
 184     {
 185 #if defined(IP_DONTFRAG)
 186       int yes = 1;
 187       if (setsockopt (sd, IPPROTO_IP, IP_DONTFRAG,
 188                       (const void *) &yes, sizeof (yes)) < 0)
 189         perror ("setsockopt(IP_DF) failed");
 190 #elif defined(IP_MTU_DISCOVER)
 191       int yes = IP_PMTUDISC_DO;
 192       if (setsockopt(sd, IPPROTO_IP, IP_MTU_DISCOVER,
 193                      (const void*) &yes, sizeof (yes)) < 0)
 194         perror ("setsockopt(IP_DF) failed");
 195 #endif
 196     }
 197
 198   hd->secure = 0;
 199   hd->fd = sd;
 200   hd->hostname = strdup (hostname);
 201   hd->ip = strdup (buffer);
 202   hd->service = strdup (portname);
 203   hd->ptr = ptr;
 204   hd->addr_info = res;
 205
 206   return;
 207 }
 208
 209 void
 210 sockets_init (void)
 211 {
 212 #ifdef _WIN32
 213     WORD wVersionRequested;
 214     WSADATA wsaData;
 215
 216     wVersionRequested = MAKEWORD (1, 1);
 217     if (WSAStartup (wVersionRequested, &wsaData) != 0)
 218       {
 219           perror ("WSA_STARTUP_ERROR");
 220       }
 221 #else
 222   signal (SIGPIPE, SIG_IGN);
 223 #endif
 224
 225 }