src/purple/purple-network.c

   1 /**
   2  * @file purple-network.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2010-11 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"
  25 #endif
  26
  27 #include <string.h>
  28
  29 #include "glib.h"
  30 #include "network.h"
  31 #include "eventloop.h"
  32
  33 #ifdef _WIN32
  34 /* for network */
  35 #include "win32/libc_interface.h"
  36 #include <nspapi.h>
  37 #else
  38 #include <sys/types.h>
  39 #include <sys/ioctl.h>
  40 #include <sys/socket.h>
  41 #include <netinet/in.h>
  42 #include <net/if.h>
  43 #include <arpa/inet.h>
  44 #ifdef HAVE_SYS_SOCKIO_H
  45 #include <sys/sockio.h> /* SIOCGIFCONF for Solaris */
  46 #endif
  47 #endif
  48
  49 #include <unistd.h>
  50
  51 #include "sipe-common.h"
  52 #include "sipe-backend.h"
  53 #include "purple-private.h"
  54
  55 #if 0
  56 /**
  57  * @TODO: get_suitable_local_ip()
  58  *
  59  * The code is most likely broken for Mac OS X as it seems that that platform
  60  * returns variable-sized "struct ifreq". The new, alignment compliant code
  61  * assumes a fix-sized "struct ifreq", i.e. it uses array access.
  62  *
  63  * If somebody is bothered by this, please provide a *VERIFIED* alternative
  64  * implementation for platforms that define _SIZEOF_ADDR_IFREQ().
  65  *
  66  **/
  67
  68 /*
  69  * Calling sizeof(struct ifreq) isn't always correct on
  70  * Mac OS X (and maybe others).
  71  */
  72 #ifdef _SIZEOF_ADDR_IFREQ
  73 #  define HX_SIZE_OF_IFREQ(a) _SIZEOF_ADDR_IFREQ(a)
  74 #else
  75 #  define HX_SIZE_OF_IFREQ(a) sizeof(a)
  76 #endif
  77 #endif
  78
  79 #define IFREQ_MAX 32
  80
  81 /**
  82  * Returns local IP address suitable for connection.
  83  *
  84  * purple_network_get_my_ip() will not do this, because it might return an
  85  * address within 169.254.x.x range that was assigned to interface disconnected
  86  * from the network (when multiple network adapters are available). This is a
  87  * copy-paste from libpurple's network.c, only change is that link local addresses
  88  * are ignored.
  89  *
  90  * Maybe this should be fixed in libpurple or some better solution found.
  91  */
  92 static const gchar *get_suitable_local_ip(void)
  93 {
  94         int source = socket(PF_INET,SOCK_STREAM, 0);
  95
  96         if (source >= 0) {
  97                 struct ifreq *buffer = g_new0(struct ifreq, IFREQ_MAX);
  98                 struct ifconf ifc;
  99                 guint32 lhost = htonl(127 * 256 * 256 * 256 + 1);
 100                 guint32 llocal = htonl((169 << 24) + (254 << 16));
 101                 guint i;
 102                 static char ip[16];
 103
 104                 /* @TODO: assumes constant sizeof(struct ifreq) [see above] */
 105                 ifc.ifc_len = sizeof(struct ifreq) * IFREQ_MAX;
 106                 ifc.ifc_req = buffer;
 107                 ioctl(source, SIOCGIFCONF, &ifc);
 108
 109                 close(source);
 110
 111                 for (i = 0; i < IFREQ_MAX; i++)
 112                 {
 113                         /* @TODO: assumes constant sizeof(struct ifreq) [see above] */
 114                         struct ifreq *ifr = &buffer[i];
 115
 116                         if (ifr->ifr_addr.sa_family == AF_INET)
 117                         {
 118                                 struct sockaddr_in sin;
 119                                 memcpy(&sin, &ifr->ifr_addr, sizeof(struct sockaddr_in));
 120                                 if (sin.sin_addr.s_addr != lhost
 121                                     && (sin.sin_addr.s_addr & htonl(0xFFFF0000)) != llocal)
 122                                 {
 123                                         long unsigned int add = ntohl(sin.sin_addr.s_addr);
 124                                         g_snprintf(ip, 16, "%lu.%lu.%lu.%lu",
 125                                                    ((add >> 24) & 255),
 126                                                    ((add >> 16) & 255),
 127                                                    ((add >> 8) & 255),
 128                                                    add & 255);
 129
 130                                         g_free(buffer);
 131                                         return ip;
 132                                 }
 133                         }
 134                 }
 135                 g_free(buffer);
 136         }
 137
 138         return "0.0.0.0";
 139 }
 140
 141 const gchar *sipe_backend_network_ip_address(void)
 142 {
 143         const gchar *ip = purple_network_get_my_ip(-1);
 144         if (g_str_has_prefix(ip, "169.254."))
 145                 ip = get_suitable_local_ip();
 146         return ip;
 147 }
 148
 149 struct sipe_backend_listendata {
 150         sipe_listen_start_cb listen_cb;
 151         sipe_client_connected_cb connect_cb;
 152
 153         PurpleNetworkListenData *listener;
 154         int watcher;
 155
 156         int listenfd;
 157         gpointer data;
 158 };
 159
 160 static void
 161 client_connected_cb(struct sipe_backend_listendata *ldata, gint listenfd,
 162                     SIPE_UNUSED_PARAMETER PurpleInputCondition cond)
 163 {
 164         struct sockaddr_in saddr;
 165         socklen_t slen = sizeof (saddr);
 166
 167         int fd = accept(listenfd, (struct sockaddr*)&saddr, &slen);
 168
 169         purple_input_remove(ldata->watcher);
 170         ldata->watcher = 0;
 171         close(listenfd);
 172         ldata->listenfd = -1;
 173
 174         if (ldata->connect_cb) {
 175                 struct sipe_backend_fd *sipe_fd = g_new(struct sipe_backend_fd, 1);
 176                 sipe_fd->fd = fd;
 177                 ldata->connect_cb(sipe_fd, ldata->data);
 178         }
 179
 180         g_free(ldata);
 181 }
 182
 183 static void
 184 backend_listen_cb(int listenfd, struct sipe_backend_listendata *ldata)
 185 {
 186         struct sockaddr_in addr;
 187         socklen_t socklen = sizeof (addr);
 188
 189         ldata->listenfd = -1;
 190         ldata->listener = NULL;
 191         ldata->listenfd = listenfd;
 192
 193         getsockname(listenfd, (struct sockaddr*)&addr, &socklen);
 194         if (ldata->listen_cb)
 195                 ldata->listen_cb(ntohs(addr.sin_port), ldata->data);
 196
 197         ldata->watcher = purple_input_add(listenfd, PURPLE_INPUT_READ,
 198                                           (PurpleInputFunction)client_connected_cb,
 199                                           ldata);
 200 }
 201
 202 struct sipe_backend_listendata *
 203 sipe_backend_network_listen_range(unsigned short port_min,
 204                                   unsigned short port_max,
 205                                   sipe_listen_start_cb listen_cb,
 206                                   sipe_client_connected_cb connect_cb,
 207                                   gpointer data)
 208 {
 209         struct sipe_backend_listendata *ldata;
 210         ldata = g_new0(struct sipe_backend_listendata, 1);
 211
 212         ldata->listen_cb = listen_cb;
 213         ldata->connect_cb = connect_cb;
 214         ldata->data = data;
 215         ldata->listener = purple_network_listen_range(port_min, port_max,
 216                                                       SOCK_STREAM,
 217                                                       (PurpleNetworkListenCallback)backend_listen_cb,
 218                                                       ldata);
 219
 220         if (!ldata->listener) {
 221                 g_free(ldata);
 222                 return NULL;
 223         }
 224
 225         return ldata;
 226 }
 227
 228 void sipe_backend_network_listen_cancel(struct sipe_backend_listendata *ldata)
 229 {
 230         g_return_if_fail(ldata);
 231
 232         if (ldata->listener)
 233                 purple_network_listen_cancel(ldata->listener);
 234         if (ldata->listenfd)
 235                 close(ldata->listenfd);
 236         g_free(ldata);
 237 }
 238
 239 gboolean
 240 sipe_backend_fd_is_valid(struct sipe_backend_fd *fd)
 241 {
 242         return fd && fd->fd >= 0;
 243 }
 244
 245 void
 246 sipe_backend_fd_free(struct sipe_backend_fd *fd)
 247 {
 248         g_free(fd);
 249 }
 250
 251 /*
 252   Local Variables:
 253   mode: c
 254   c-file-style: "bsd"
 255   indent-tabs-mode: t
 256   tab-width: 8
 257   End:
 258 */