src/purple/purple-network.c

   1 /**
   2  * @file purple-network.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2010-12 SIPE Project <http://sipe.sourceforge.net/>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h" /* coverity[hfa: FALSE] */
  25 #endif
  26
  27 #include <string.h>
  28
  29 #include "glib.h"
  30 #include "network.h"
  31 #include "eventloop.h"
  32 #include "version.h"
  33
  34 #ifdef _WIN32
  35 /* wrappers for write() & friends for socket handling */
  36 #include "win32/win32dep.h"
  37 #include <nspapi.h>
  38 #else
  39 #include <sys/types.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/socket.h>
  42 #include <netinet/in.h>
  43 #include <net/if.h>
  44 #include <arpa/inet.h>
  45 #ifdef HAVE_SYS_SOCKIO_H
  46 #include <sys/sockio.h> /* SIOCGIFCONF for Solaris */
  47 #endif
  48 #endif
  49
  50 #ifdef HAVE_UNISTD_H
  51 #include <unistd.h>
  52 #endif
  53
  54 #include "sipe-common.h"
  55 #include "sipe-backend.h"
  56 #include "purple-private.h"
  57
  58 #if 0
  59 /**
  60  * @TODO: get_suitable_local_ip()
  61  *
  62  * The code is most likely broken for Mac OS X as it seems that that platform
  63  * returns variable-sized "struct ifreq". The new, alignment compliant code
  64  * assumes a fix-sized "struct ifreq", i.e. it uses array access.
  65  *
  66  * If somebody is bothered by this, please provide a *VERIFIED* alternative
  67  * implementation for platforms that define _SIZEOF_ADDR_IFREQ().
  68  *
  69  **/
  70
  71 /*
  72  * Calling sizeof(struct ifreq) isn't always correct on
  73  * Mac OS X (and maybe others).
  74  */
  75 #ifdef _SIZEOF_ADDR_IFREQ
  76 #  define HX_SIZE_OF_IFREQ(a) _SIZEOF_ADDR_IFREQ(a)
  77 #else
  78 #  define HX_SIZE_OF_IFREQ(a) sizeof(a)
  79 #endif
  80 #endif
  81
  82 #define IFREQ_MAX 32
  83
  84 /**
  85  * Returns local IP address suitable for connection.
  86  *
  87  * purple_network_get_my_ip() will not do this, because it might return an
  88  * address within 169.254.x.x range that was assigned to interface disconnected
  89  * from the network (when multiple network adapters are available). This is a
  90  * copy-paste from libpurple's network.c, only change is that link local addresses
  91  * are ignored.
  92  *
  93  * Maybe this should be fixed in libpurple or some better solution found.
  94  */
  95 static const gchar *get_suitable_local_ip(void)
  96 {
  97         int source = socket(PF_INET,SOCK_STREAM, 0);
  98
  99         if (source >= 0) {
 100                 struct ifreq *buffer = g_new0(struct ifreq, IFREQ_MAX);
 101                 struct ifconf ifc;
 102                 guint32 lhost = htonl(127 * 256 * 256 * 256 + 1);
 103                 guint32 llocal = htonl((169 << 24) + (254 << 16));
 104                 guint i;
 105                 static char ip[16];
 106
 107                 /* @TODO: assumes constant sizeof(struct ifreq) [see above] */
 108                 ifc.ifc_len = sizeof(struct ifreq) * IFREQ_MAX;
 109                 ifc.ifc_req = buffer;
 110                 ioctl(source, SIOCGIFCONF, &ifc);
 111
 112                 close(source);
 113
 114                 for (i = 0; i < IFREQ_MAX; i++)
 115                 {
 116                         /* @TODO: assumes constant sizeof(struct ifreq) [see above] */
 117                         struct ifreq *ifr = &buffer[i];
 118
 119                         if (ifr->ifr_addr.sa_family == AF_INET)
 120                         {
 121                                 struct sockaddr_in sin;
 122                                 memcpy(&sin, &ifr->ifr_addr, sizeof(struct sockaddr_in));
 123                                 if (sin.sin_addr.s_addr != lhost
 124                                     && (sin.sin_addr.s_addr & htonl(0xFFFF0000)) != llocal)
 125                                 {
 126                                         long unsigned int add = ntohl(sin.sin_addr.s_addr);
 127                                         g_snprintf(ip, 16, "%lu.%lu.%lu.%lu",
 128                                                    ((add >> 24) & 255),
 129                                                    ((add >> 16) & 255),
 130                                                    ((add >> 8) & 255),
 131                                                    add & 255);
 132
 133                                         g_free(buffer);
 134                                         return ip;
 135                                 }
 136                         }
 137                 }
 138                 g_free(buffer);
 139         }
 140
 141         return "0.0.0.0";
 142 }
 143
 144 const gchar *sipe_backend_network_ip_address(SIPE_UNUSED_PARAMETER struct sipe_core_public *sipe_public)
 145 {
 146         const gchar *ip = purple_network_get_my_ip(-1);
 147         if (g_str_has_prefix(ip, "169.254."))
 148                 ip = get_suitable_local_ip();
 149         return ip;
 150 }
 151
 152 struct sipe_backend_listendata {
 153         sipe_listen_start_cb listen_cb;
 154         sipe_client_connected_cb connect_cb;
 155
 156         PurpleNetworkListenData *listener;
 157         int watcher;
 158
 159         int listenfd;
 160         gpointer data;
 161 };
 162
 163 static void
 164 client_connected_cb(struct sipe_backend_listendata *ldata, gint listenfd,
 165                     SIPE_UNUSED_PARAMETER PurpleInputCondition cond)
 166 {
 167         struct sockaddr_in saddr;
 168         socklen_t slen = sizeof (saddr);
 169
 170         int fd = accept(listenfd, (struct sockaddr*)&saddr, &slen);
 171
 172         purple_input_remove(ldata->watcher);
 173         ldata->watcher = 0;
 174         close(listenfd);
 175         ldata->listenfd = -1;
 176
 177         if (ldata->connect_cb) {
 178                 struct sipe_backend_fd *sipe_fd = g_new(struct sipe_backend_fd, 1);
 179                 sipe_fd->fd = fd;
 180                 ldata->connect_cb(sipe_fd, ldata->data);
 181         }
 182
 183         g_free(ldata);
 184 }
 185
 186 static void
 187 backend_listen_cb(int listenfd, struct sipe_backend_listendata *ldata)
 188 {
 189         struct sockaddr_in addr;
 190         socklen_t socklen = sizeof (addr);
 191
 192         ldata->listenfd = -1;
 193         ldata->listener = NULL;
 194         ldata->listenfd = listenfd;
 195
 196         /* ignore error code */
 197         (void) getsockname(listenfd, (struct sockaddr*)&addr, &socklen);
 198         if (ldata->listen_cb)
 199                 ldata->listen_cb(ntohs(addr.sin_port), ldata->data);
 200
 201         ldata->watcher = purple_input_add(listenfd, PURPLE_INPUT_READ,
 202                                           (PurpleInputFunction)client_connected_cb,
 203                                           ldata);
 204 }
 205
 206 struct sipe_backend_listendata *
 207 sipe_backend_network_listen_range(unsigned short port_min,
 208                                   unsigned short port_max,
 209                                   sipe_listen_start_cb listen_cb,
 210                                   sipe_client_connected_cb connect_cb,
 211                                   gpointer data)
 212 {
 213         struct sipe_backend_listendata *ldata;
 214         ldata = g_new0(struct sipe_backend_listendata, 1);
 215
 216         ldata->listen_cb = listen_cb;
 217         ldata->connect_cb = connect_cb;
 218         ldata->data = data;
 219         ldata->listener = purple_network_listen_range(port_min, port_max,
 220 #if PURPLE_VERSION_CHECK(3,0,0)
 221                                                       /* @TODO: does FT work with IPv6? */
 222                                                       AF_INET,
 223 #endif
 224                                                       SOCK_STREAM,
 225 #if PURPLE_VERSION_CHECK(3,0,0)
 226                                                       /* @TODO: should we allow external mapping? */
 227                                                       FALSE,
 228 #endif
 229                                                       (PurpleNetworkListenCallback)backend_listen_cb,
 230                                                       ldata);
 231
 232         if (!ldata->listener) {
 233                 g_free(ldata);
 234                 return NULL;
 235         }
 236
 237         return ldata;
 238 }
 239
 240 void sipe_backend_network_listen_cancel(struct sipe_backend_listendata *ldata)
 241 {
 242         g_return_if_fail(ldata);
 243
 244         if (ldata->listener)
 245                 purple_network_listen_cancel(ldata->listener);
 246         if (ldata->listenfd)
 247                 close(ldata->listenfd);
 248         g_free(ldata);
 249 }
 250
 251 gboolean
 252 sipe_backend_fd_is_valid(struct sipe_backend_fd *fd)
 253 {
 254         return fd && fd->fd >= 0;
 255 }
 256
 257 void
 258 sipe_backend_fd_free(struct sipe_backend_fd *fd)
 259 {
 260         g_free(fd);
 261 }
 262
 263 /*
 264   Local Variables:
 265   mode: c
 266   c-file-style: "bsd"
 267   indent-tabs-mode: t
 268   tab-width: 8
 269   End:
 270 */