capture_ifinfo.c

   1 /* capture_ifinfo.c
   2  * Routines for getting interface information from dumpcap
   3  *
   4  * $Id$
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 #include "config.h"
  26
  27 #ifdef HAVE_LIBPCAP
  28
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <stdio.h>
  32
  33 #ifdef HAVE_ARPA_INET_H
  34 #include <arpa/inet.h>
  35 #endif
  36
  37 #ifdef HAVE_SYS_SOCKET_H
  38 #include <sys/socket.h>         /* needed to define AF_ values on UNIX */
  39 #endif
  40
  41 #ifdef HAVE_WINSOCK2_H
  42 #include <winsock2.h>           /* needed to define AF_ values on Windows */
  43 #endif
  44
  45 #ifdef NEED_INET_V6DEFS_H
  46 # include "wsutil/inet_v6defs.h"
  47 #endif
  48
  49 #include <glib.h>
  50
  51 #include "capture_opts.h"
  52 #include "capture_session.h"
  53 #include "capture_sync.h"
  54 #include "log.h"
  55
  56 #include "capture_ifinfo.h"
  57
  58 #ifdef HAVE_PCAP_REMOTE
  59 static GList *remote_interface_list = NULL;
  60
  61 static void append_remote_list(GList *iflist)
  62 {
  63     GSList *list;
  64     GList *rlist;
  65     if_addr_t *if_addr, *temp_addr;
  66     if_info_t *if_info, *temp;
  67
  68     for (rlist = g_list_nth(remote_interface_list, 0); rlist != NULL; rlist = g_list_next(rlist)) {
  69         if_info = (if_info_t *)rlist->data;
  70         temp = g_malloc0(sizeof(if_info_t));
  71         temp->name = g_strdup(if_info->name);
  72         temp->friendly_name = g_strdup(if_info->friendly_name);
  73         temp->vendor_description = g_strdup(if_info->vendor_description);
  74         for (list = g_slist_nth(if_info->addrs, 0); list != NULL; list = g_slist_next(list)) {
  75             temp_addr = g_malloc0(sizeof(if_addr_t));
  76             if_addr = (if_addr_t *)list->data;
  77             if (if_addr) {
  78                 temp_addr->ifat_type = if_addr->ifat_type;
  79                 if (temp_addr->ifat_type == IF_AT_IPv4) {
  80                     temp_addr->addr.ip4_addr = if_addr->addr.ip4_addr;
  81                 } else {
  82                     memcpy(temp_addr->addr.ip6_addr, if_addr->addr.ip6_addr, sizeof(if_addr->addr));
  83                 }
  84             } else {
  85                 g_free(temp_addr);
  86                 temp_addr = NULL;
  87             }
  88             if (temp_addr) {
  89                 temp->addrs = g_slist_append(temp->addrs, temp_addr);
  90             }
  91         }
  92         temp->loopback = if_info->loopback;
  93         iflist = g_list_append(iflist, temp);
  94    }
  95 }
  96 #endif
  97
  98 /**
  99  * Fetch the interface list from a child process (dumpcap).
 100  *
 101  * @return A GList containing if_info_t structs if successful, NULL (with err and possibly err_str set) otherwise.
 102  *
 103  */
 104
 105 /* XXX - We parse simple text output to get our interface list.  Should
 106  * we use "real" data serialization instead, e.g. via XML? */
 107 GList *
 108 capture_interface_list(int *err, char **err_str, void (*update_cb)(void))
 109 {
 110     int        ret;
 111     GList     *if_list = NULL;
 112     int        i, j;
 113     gchar     *data, *primary_msg, *secondary_msg;
 114     gchar    **raw_list, **if_parts, **addr_parts;
 115     gchar     *name;
 116     if_info_t *if_info;
 117     if_addr_t *if_addr;
 118
 119     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface List ...");
 120
 121     /* Try to get our interface list */
 122     ret = sync_interface_list_open(&data, &primary_msg, &secondary_msg, update_cb);
 123     if (ret != 0) {
 124         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface List failed!");
 125         if (err_str) {
 126             *err_str = primary_msg;
 127         } else {
 128             g_free(primary_msg);
 129         }
 130         g_free(secondary_msg);
 131         *err = CANT_GET_INTERFACE_LIST;
 132         return NULL;
 133     }
 134
 135     /* Split our lines */
 136 #ifdef _WIN32
 137     raw_list = g_strsplit(data, "\r\n", 0);
 138 #else
 139     raw_list = g_strsplit(data, "\n", 0);
 140 #endif
 141     g_free(data);
 142
 143     for (i = 0; raw_list[i] != NULL; i++) {
 144         if_parts = g_strsplit(raw_list[i], "\t", 6);
 145         if (if_parts[0] == NULL || if_parts[1] == NULL || if_parts[2] == NULL ||
 146                 if_parts[3] == NULL || if_parts[4] == NULL || if_parts[5] == NULL) {
 147             g_strfreev(if_parts);
 148             continue;
 149         }
 150
 151         /* Number followed by the name, e.g "1. eth0" */
 152         name = strchr(if_parts[0], ' ');
 153         if (name) {
 154             name++;
 155         } else {
 156             g_strfreev(if_parts);
 157             continue;
 158         }
 159
 160         if_info = g_new0(if_info_t,1);
 161         if_info->name = g_strdup(name);
 162         if (strlen(if_parts[1]) > 0)
 163             if_info->vendor_description = g_strdup(if_parts[1]);
 164         if (strlen(if_parts[2]) > 0)
 165             if_info->friendly_name = g_strdup(if_parts[2]);
 166         if_info->type = (interface_type)(int)strtol(if_parts[3], NULL, 10);
 167         addr_parts = g_strsplit(if_parts[4], ",", 0);
 168         for (j = 0; addr_parts[j] != NULL; j++) {
 169             if_addr = g_new0(if_addr_t,1);
 170             if (inet_pton(AF_INET, addr_parts[j], &if_addr->addr.ip4_addr) > 0) {
 171                 if_addr->ifat_type = IF_AT_IPv4;
 172             } else if (inet_pton(AF_INET6, addr_parts[j],
 173                     &if_addr->addr.ip6_addr) > 0) {
 174                 if_addr->ifat_type = IF_AT_IPv6;
 175             } else {
 176                 g_free(if_addr);
 177                 if_addr = NULL;
 178             }
 179             if (if_addr) {
 180                 if_info->addrs = g_slist_append(if_info->addrs, if_addr);
 181             }
 182         }
 183         if (strcmp(if_parts[5], "loopback") == 0)
 184             if_info->loopback = TRUE;
 185         g_strfreev(if_parts);
 186         g_strfreev(addr_parts);
 187         if_list = g_list_append(if_list, if_info);
 188     }
 189     g_strfreev(raw_list);
 190
 191     /* Check to see if we built a list */
 192     if (if_list == NULL) {
 193         *err = NO_INTERFACES_FOUND;
 194         if (err_str)
 195             *err_str = g_strdup("No interfaces found");
 196     }
 197 #ifdef HAVE_PCAP_REMOTE
 198     if (remote_interface_list && g_list_length(remote_interface_list) > 0) {
 199         append_remote_list(if_list);
 200     }
 201 #endif
 202     return if_list;
 203 }
 204
 205 /* XXX - We parse simple text output to get our interface list.  Should
 206  * we use "real" data serialization instead, e.g. via XML? */
 207 if_capabilities_t *
 208 capture_get_if_capabilities(const gchar *ifname, gboolean monitor_mode,
 209                             char **err_str, void (*update_cb)(void))
 210 {
 211     if_capabilities_t *caps;
 212     GList              *linktype_list = NULL;
 213     int                 err, i;
 214     gchar              *data, *primary_msg, *secondary_msg;
 215     gchar             **raw_list, **lt_parts;
 216     data_link_info_t   *data_link_info;
 217
 218     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface Capabilities ...");
 219
 220     /* Try to get our interface list */
 221     err = sync_if_capabilities_open(ifname, monitor_mode, &data,
 222                                     &primary_msg, &secondary_msg, update_cb);
 223     if (err != 0) {
 224         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface Capabilities failed!");
 225         if (err_str) {
 226             *err_str = primary_msg;
 227         } else {
 228             g_free(primary_msg);
 229         }
 230         g_free(secondary_msg);
 231         return NULL;
 232     }
 233
 234     /* Split our lines */
 235 #ifdef _WIN32
 236     raw_list = g_strsplit(data, "\r\n", 0);
 237 #else
 238     raw_list = g_strsplit(data, "\n", 0);
 239 #endif
 240     g_free(data);
 241
 242     /*
 243      * First line is 0 if monitor mode isn't supported, 1 if it is.
 244      */
 245     if (raw_list[0] == NULL || *raw_list[0] == '\0') {
 246         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface Capabilities returned no information!");
 247         if (err_str) {
 248             *err_str = g_strdup("Dumpcap returned no interface capability information");
 249         }
 250         return NULL;
 251     }
 252
 253     /*
 254      * Allocate the interface capabilities structure.
 255      */
 256     caps = (if_capabilities_t *)g_malloc(sizeof *caps);
 257     switch (*raw_list[0]) {
 258
 259     case '0':
 260         caps->can_set_rfmon = FALSE;
 261         break;
 262
 263     case '1':
 264         caps->can_set_rfmon = TRUE;
 265         break;
 266
 267     default:
 268         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface Capabilities returned bad information!");
 269         if (err_str) {
 270             *err_str = g_strdup_printf("Dumpcap returned \"%s\" for monitor-mode capability",
 271                                        raw_list[0]);
 272         }
 273         g_free(caps);
 274         return NULL;
 275     }
 276
 277     /*
 278      * The rest are link-layer types.
 279      */
 280     for (i = 1; raw_list[i] != NULL; i++) {
 281         /* ...and what if the interface name has a tab in it, Mr. Clever Programmer? */
 282         lt_parts = g_strsplit(raw_list[i], "\t", 3);
 283         if (lt_parts[0] == NULL || lt_parts[1] == NULL || lt_parts[2] == NULL) {
 284             g_strfreev(lt_parts);
 285             continue;
 286         }
 287
 288         data_link_info = g_new(data_link_info_t,1);
 289         data_link_info->dlt = (int) strtol(lt_parts[0], NULL, 10);
 290         data_link_info->name = g_strdup(lt_parts[1]);
 291         if (strcmp(lt_parts[2], "(not supported)") != 0)
 292             data_link_info->description = g_strdup(lt_parts[2]);
 293         else
 294             data_link_info->description = NULL;
 295
 296         linktype_list = g_list_append(linktype_list, data_link_info);
 297     }
 298     g_strfreev(raw_list);
 299
 300     /* Check to see if we built a list */
 301     if (linktype_list == NULL) {
 302         /* No. */
 303         if (err_str)
 304             *err_str = g_strdup("Dumpcap returned no link-layer types");
 305         g_free(caps);
 306         return NULL;
 307     }
 308     caps->data_link_types = linktype_list;
 309     return caps;
 310 }
 311
 312 #ifdef HAVE_PCAP_REMOTE
 313 void add_interface_to_remote_list(if_info_t *if_info)
 314 {
 315     GSList *list;
 316     if_addr_t *if_addr, *temp_addr;
 317
 318     if_info_t *temp = g_malloc0(sizeof(if_info_t));
 319     temp->name = g_strdup(if_info->name);
 320     temp->friendly_name = g_strdup(if_info->friendly_name);
 321     temp->vendor_description = g_strdup(if_info->vendor_description);
 322     for (list = g_slist_nth(if_info->addrs, 0); list != NULL; list = g_slist_next(list)) {
 323         temp_addr = g_malloc0(sizeof(if_addr_t));
 324         if_addr = (if_addr_t *)list->data;
 325         if (if_addr) {
 326             temp_addr->ifat_type = if_addr->ifat_type;
 327             if (temp_addr->ifat_type == IF_AT_IPv4) {
 328                 temp_addr->addr.ip4_addr = if_addr->addr.ip4_addr;
 329             } else {
 330                 memcpy(temp_addr->addr.ip6_addr, if_addr->addr.ip6_addr, sizeof(if_addr->addr));
 331             }
 332         } else {
 333             g_free(temp_addr);
 334             temp_addr = NULL;
 335         }
 336         if (temp_addr) {
 337             temp->addrs = g_slist_append(temp->addrs, temp_addr);
 338         }
 339     }
 340     temp->loopback = if_info->loopback;
 341     remote_interface_list = g_list_append(remote_interface_list, temp);
 342 }
 343 #endif
 344 #endif /* HAVE_LIBPCAP */