aboutsummaryrefslogtreecommitdiffstats
path: root/capture_ifinfo.c
blob: c9c03a1374ed08d088b818cd06e88a043ea275fd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
/* capture_ifinfo.c
 * Routines for getting interface information from dumpcap
 *
 * $Id$
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifdef HAVE_LIBPCAP

#include <stdlib.h>
#include <string.h>

#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif

#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>         /* needed to define AF_ values on UNIX */
#endif

#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>           /* needed to define AF_ values on Windows */
#endif

#ifdef NEED_INET_V6DEFS_H
# include "wsutil/inet_v6defs.h"
#endif

#include <glib.h>

#include "capture_opts.h"
#include "capture_sync.h"
#include "log.h"

#include "wsutil/file_util.h"

#include "capture_ifinfo.h"

#ifdef HAVE_PCAP_REMOTE
static GList *remote_interface_list = NULL;

static void append_remote_list(GList *iflist)
{
    GSList *list;
    GList *rlist;
    if_addr_t *if_addr, *temp_addr;
    if_info_t *if_info, *temp;

    for (rlist = g_list_nth(remote_interface_list, 0); rlist != NULL; rlist = g_list_next(rlist)) {
        if_info = (if_info_t *)rlist->data;
        temp = g_malloc0(sizeof(if_info_t));
        temp->name = g_strdup(if_info->name);
        temp->description = g_strdup(if_info->description);
        for (list = g_slist_nth(if_info->addrs, 0); list != NULL; list = g_slist_next(list)) {
            temp_addr = g_malloc0(sizeof(if_addr_t));
            if_addr = (if_addr_t *)list->data;
            if (if_addr) {
                temp_addr->ifat_type = if_addr->ifat_type;
                if (temp_addr->ifat_type == IF_AT_IPv4) {
                    temp_addr->addr.ip4_addr = if_addr->addr.ip4_addr;
                } else {
                    memcpy(temp_addr->addr.ip6_addr, if_addr->addr.ip6_addr, sizeof(if_addr->addr));
                }
            } else {
                g_free(temp_addr);
                temp_addr = NULL;
            }
            if (temp_addr) {
                temp->addrs = g_slist_append(temp->addrs, temp_addr);
            }
        }
        temp->loopback = if_info->loopback;
        iflist = g_list_append(iflist, temp);
   }
}
#endif

/**
 * Fetch the interface list from a child process (dumpcap).
 *
 * @return A GList containing if_info_t structs if successful, NULL (with err and possibly err_str set) otherwise.
 *
 */

/* XXX - We parse simple text output to get our interface list.  Should
 * we use "real" data serialization instead, e.g. via XML? */
GList *
capture_interface_list(int *err, char **err_str)
{
    int        ret;
    GList     *if_list = NULL;
    int        i, j;
    gchar     *data, *primary_msg, *secondary_msg;
    gchar    **raw_list, **if_parts, **addr_parts;
    gchar     *name;
    if_info_t *if_info;
    if_addr_t *if_addr;

    g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface List ...");

    /* Try to get our interface list */
    ret = sync_interface_list_open(&data, &primary_msg, &secondary_msg);
    if (ret != 0) {
        g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface List failed!");
        if (err_str) {
            *err_str = primary_msg;
        } else {
            g_free(primary_msg);
        }
        g_free(secondary_msg);
        *err = CANT_GET_INTERFACE_LIST;
        return NULL;
    }

    /* Split our lines */
#ifdef _WIN32
    raw_list = g_strsplit(data, "\r\n", 0);
#else
    raw_list = g_strsplit(data, "\n", 0);
#endif
    g_free(data);

    for (i = 0; raw_list[i] != NULL; i++) {
        if_parts = g_strsplit(raw_list[i], "\t", 4);
        if (if_parts[0] == NULL || if_parts[1] == NULL || if_parts[2] == NULL ||
                if_parts[3] == NULL) {
            g_strfreev(if_parts);
            continue;
        }

        /* Number followed by the name, e.g "1. eth0" */
        name = strchr(if_parts[0], ' ');
        if (name) {
            name++;
        } else {
            g_strfreev(if_parts);
            continue;
        }

        if_info = g_malloc0(sizeof(if_info_t));
        if_info->name = g_strdup(name);
        if (strlen(if_parts[1]) > 0)
            if_info->description = g_strdup(if_parts[1]);
        addr_parts = g_strsplit(if_parts[2], ",", 0);
        for (j = 0; addr_parts[j] != NULL; j++) {
            if_addr = g_malloc0(sizeof(if_addr_t));
            if (inet_pton(AF_INET, addr_parts[j], &if_addr->addr.ip4_addr)) {
                if_addr->ifat_type = IF_AT_IPv4;
            } else if (inet_pton(AF_INET6, addr_parts[j],
                    &if_addr->addr.ip6_addr)) {
                if_addr->ifat_type = IF_AT_IPv6;
            } else {
                g_free(if_addr);
                if_addr = NULL;
            }
            if (if_addr) {
                if_info->addrs = g_slist_append(if_info->addrs, if_addr);
            }
        }
        if (strcmp(if_parts[3], "loopback") == 0)
            if_info->loopback = TRUE;
        g_strfreev(if_parts);
        g_strfreev(addr_parts);
        if_list = g_list_append(if_list, if_info);
    }
    g_strfreev(raw_list);

    /* Check to see if we built a list */
    if (if_list == NULL) {
        *err = NO_INTERFACES_FOUND;
        if (err_str)
            *err_str = g_strdup("No interfaces found");
    }
#ifdef HAVE_PCAP_REMOTE
    if (remote_interface_list && g_list_length(remote_interface_list) > 0) {
        append_remote_list(if_list);
    }
#endif
    return if_list;
}

/* XXX - We parse simple text output to get our interface list.  Should
 * we use "real" data serialization instead, e.g. via XML? */
if_capabilities_t *
capture_get_if_capabilities(const gchar *ifname, gboolean monitor_mode,
                            char **err_str)
{
    if_capabilities_t *caps;
    GList              *linktype_list = NULL;
    int                 err, i;
    gchar              *data, *primary_msg, *secondary_msg;
    gchar             **raw_list, **lt_parts;
    data_link_info_t   *data_link_info;

    g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface Capabilities ...");

    /* Try to get our interface list */
    err = sync_if_capabilities_open(ifname, monitor_mode, &data,
                                    &primary_msg, &secondary_msg);
    if (err != 0) {
        g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface Capabilities failed!");
        if (err_str) {
            *err_str = primary_msg;
        } else {
            g_free(primary_msg);
        }
        g_free(secondary_msg);
        return NULL;
    }

    /* Split our lines */
#ifdef _WIN32
    raw_list = g_strsplit(data, "\r\n", 0);
#else
    raw_list = g_strsplit(data, "\n", 0);
#endif
    g_free(data);

    /*
     * First line is 0 if monitor mode isn't supported, 1 if it is.
     */
    if (raw_list[0] == NULL || *raw_list[0] == '\0') {
        g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface Capabilities returned no information!");
        if (err_str) {
            *err_str = g_strdup("Dumpcap returned no interface capability information");
        }
        return NULL;
    }

    /*
     * Allocate the interface capabilities structure.
     */
    caps = g_malloc(sizeof *caps);
    switch (*raw_list[0]) {

    case '0':
        caps->can_set_rfmon = FALSE;
        break;

    case '1':
        caps->can_set_rfmon = TRUE;
        break;

    default:
        g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface Capabilities returned bad information!");
        if (err_str) {
            *err_str = g_strdup_printf("Dumpcap returned \"%s\" for monitor-mode capability",
                                       raw_list[0]);
        }
        g_free(caps);
        return NULL;
    }

    /*
     * The rest are link-layer types.
     */
    for (i = 1; raw_list[i] != NULL; i++) {
        /* ...and what if the interface name has a tab in it, Mr. Clever Programmer? */
        lt_parts = g_strsplit(raw_list[i], "\t", 3);
        if (lt_parts[0] == NULL || lt_parts[1] == NULL || lt_parts[2] == NULL) {
            g_strfreev(lt_parts);
            continue;
        }

        data_link_info = g_malloc(sizeof (data_link_info_t));
        data_link_info->dlt = (int) strtol(lt_parts[0], NULL, 10);
        data_link_info->name = g_strdup(lt_parts[1]);
        if (strcmp(lt_parts[2], "(not supported)") != 0)
            data_link_info->description = g_strdup(lt_parts[2]);
        else
            data_link_info->description = NULL;

        linktype_list = g_list_append(linktype_list, data_link_info);
    }
    g_strfreev(raw_list);

    /* Check to see if we built a list */
    if (linktype_list == NULL) {
        /* No. */
        if (err_str)
            *err_str = g_strdup("Dumpcap returned no link-layer types");
        g_free(caps);
        return NULL;
    }
    caps->data_link_types = linktype_list;
    return caps;
}

#ifdef HAVE_PCAP_REMOTE
void add_interface_to_remote_list(if_info_t *if_info)
{
    GSList *list;
    if_addr_t *if_addr, *temp_addr;

    if_info_t *temp = g_malloc0(sizeof(if_info_t));
    temp->name = g_strdup(if_info->name);
    temp->description = g_strdup(if_info->description);
    for (list = g_slist_nth(if_info->addrs, 0); list != NULL; list = g_slist_next(list)) {
        temp_addr = g_malloc0(sizeof(if_addr_t));
        if_addr = (if_addr_t *)list->data;
        if (if_addr) {
            temp_addr->ifat_type = if_addr->ifat_type;
            if (temp_addr->ifat_type == IF_AT_IPv4) {
                temp_addr->addr.ip4_addr = if_addr->addr.ip4_addr;
            } else {
                memcpy(temp_addr->addr.ip6_addr, if_addr->addr.ip6_addr, sizeof(if_addr->addr));
            }
        } else {
            g_free(temp_addr);
            temp_addr = NULL;
        }
        if (temp_addr) {
            temp->addrs = g_slist_append(temp->addrs, temp_addr);
        }
    }
    temp->loopback = if_info->loopback;
    remote_interface_list = g_list_append(remote_interface_list, temp);
}
#endif

guint
get_interface_type(gchar *name, gchar *description)
{
#if defined(__linux__)
    ws_statb64 statb;
    char *wireless_path;
#endif
#if defined(_WIN32)
    /*
     * Much digging failed to reveal any obvious way to get something such
     * as the SNMP MIB-II ifType value for an interface:
     *
     *    http://www.iana.org/assignments/ianaiftype-mib
     *
     * by making some NDIS request.
     */
    if (description && (strstr(description,"generic dialup") != NULL ||
            strstr(description,"PPP/SLIP") != NULL )) {
        return IF_DIALUP;
    } else if (description && (strstr(description,"Wireless") != NULL ||
            strstr(description,"802.11") != NULL)) {
        return IF_WIRELESS;
    } else if (description && strstr(description,"AirPcap") != NULL ||
            strstr(name,"airpcap")) {
        return IF_AIRPCAP;
    } else if (description && strstr(description, "Bluetooth") != NULL ) {
        return IF_BLUETOOTH;
    }
#elif defined(__APPLE__)
    /*
     * XXX - yes, fetching all the network addresses for an interface
     * gets you an AF_LINK address, of type "struct sockaddr_dl", and,
     * yes, that includes an SNMP MIB-II ifType value.
     *
     * However, it's IFT_ETHER, i.e. Ethernet, for AirPort interfaces,
     * not IFT_IEEE80211 (which isn't defined in OS X in any case).
     *
     * Perhaps some other BSD-flavored OSes won't make this mistake;
     * however, FreeBSD 7.0 and OpenBSD 4.2, at least, appear to have
     * made the same mistake, at least for my Belkin ZyDAS stick.
     *
     * XXX - this is wrong on a MacBook Air, as en0 is the AirPort
     * interface, and it's also wrong on a Mac that has no AirPort
     * interfaces and has multiple Ethernet interfaces.
     *
     * The SystemConfiguration framework is your friend here.
     * SCNetworkInterfaceGetInterfaceType() will get the interface
     * type.  SCNetworkInterfaceCopyAll() gets all network-capable
     * interfaces on the system; SCNetworkInterfaceGetBSDName()
     * gets the "BSD name" of the interface, so we look for
     * an interface with the specified "BSD name" and get its
     * interface type.  The interface type is a CFString, and:
     *
     *    kSCNetworkInterfaceTypeIEEE80211 means IF_WIRELESS;
     *    kSCNetworkInterfaceTypeBluetooth means IF_BLUETOOTH;
     *    kSCNetworkInterfaceTypeModem or
     *    kSCNetworkInterfaceTypePPP or
     *    maybe kSCNetworkInterfaceTypeWWAN means IF_DIALUP
     */
    if (strcmp(name, "en1") == 0) {
        return IF_WIRELESS;
    }
    /*
     * XXX - PPP devices have names beginning with "ppp" and an IFT_ of
     * IFT_PPP, but they could be dial-up, or PPPoE, or mobile phone modem,
     * or VPN, or... devices.  One might have to dive into the bowels of
     * IOKit to find out.
     */

    /*
     * XXX - there's currently no support for raw Bluetooth capture,
     * and IP-over-Bluetooth devices just look like fake Ethernet
     * devices.  There's also Bluetooth modem support, but that'll
     * probably just give you a device that looks like a PPP device.
     */
#elif defined(__linux__)
    /*
     * Look for /sys/class/net/{device}/wireless.
     */
    wireless_path = g_strdup_printf("/sys/class/net/%s/wireless", name);
    if (wireless_path != NULL) {
        if (ws_stat64(wireless_path, &statb) == 0) {
            g_free(wireless_path);
            return IF_WIRELESS;
        }
    }
    /*
     * Bluetooth devices.
     *
     * XXX - this is for raw Bluetooth capture; what about IP-over-Bluetooth
     * devices?
     */
    if ( strstr(name,"bluetooth") != NULL) {
        return IF_BLUETOOTH;
    }

    /*
     * USB devices.
     */
    if ( strstr(name,"usbmon") != NULL ) {
        return IF_USB;
    }
#endif
    /*
     * Bridge, NAT, or host-only interfaces on VMWare hosts have the name
     * vmnet[0-9]+ or VMnet[0-9+ on Windows. Guests might use a native
     * (LANCE or E1000) driver or the vmxnet driver. These devices have an
     * IFT_ of IFT_ETHER, so we have to check the name.
     */
    if ( g_ascii_strncasecmp(name, "vmnet", 5) == 0) {
        return IF_VIRTUAL;
    }

    if ( g_ascii_strncasecmp(name, "vmxnet", 6) == 0) {
        return IF_VIRTUAL;
    }

    if (description && strstr(description, "VMware") != NULL ) {
        return IF_VIRTUAL;
    }

    return IF_WIRED;
}
#endif /* HAVE_LIBPCAP */