1 /* capture-pcap-util-unix.c
2 * UN*X-specific utility routines for packet capture
6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1998 Gerald Combs
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.
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.
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.
40 #ifdef HAVE_SYS_SOCKET_H
41 #include <sys/socket.h>
44 #ifdef HAVE_SYS_IOCTL_H
45 #include <sys/ioctl.h>
49 * Keep Digital UNIX happy when including <net/if.h>.
55 #ifdef HAVE_SYS_SOCKIO_H
56 # include <sys/sockio.h>
59 #include "capture_ifinfo.h"
60 #include "capture-pcap-util.h"
61 #include "capture-pcap-util-int.h"
63 #ifndef HAVE_PCAP_FINDALLDEVS
64 struct search_user_data {
70 search_for_if_cb(gpointer data, gpointer user_data);
73 #ifdef HAVE_PCAP_REMOTE
75 get_remote_interface_list(const char *hostname, const char *port,
76 int auth_type, const char *username,
77 const char *passwd, int *err, char **err_str)
79 struct pcap_rmtauth auth;
80 char source[PCAP_BUF_SIZE];
81 char errbuf[PCAP_ERRBUF_SIZE];
84 if (pcap_createsrcstr(source, PCAP_SRC_IFREMOTE, hostname, port,
85 NULL, errbuf) == -1) {
86 *err = CANT_GET_INTERFACE_LIST;
88 *err_str = cant_get_if_list_error_message(errbuf);
92 auth.type = auth_type;
93 auth.username = g_strdup(username);
94 auth.password = g_strdup(passwd);
96 result = get_interface_list_findalldevs_ex(source, &auth, err, err_str);
97 g_free(auth.username);
98 g_free(auth.password);
105 get_interface_list(int *err, char **err_str)
107 #ifdef HAVE_PCAP_FINDALLDEVS
108 return get_interface_list_findalldevs(err, err_str);
111 gint nonloopback_pos = 0;
112 struct ifreq *ifr, *last;
114 struct ifreq ifrflags;
115 int sock = socket(AF_INET, SOCK_DGRAM, 0);
116 struct search_user_data user_data;
121 char errbuf[PCAP_ERRBUF_SIZE];
125 *err = CANT_GET_INTERFACE_LIST;
126 if (err_str != NULL) {
127 *err_str = g_strdup_printf(
128 "Can't get list of interfaces: error opening socket: %s",
135 * This code came from: W. Richard Stevens: "UNIX Network Programming",
136 * Networking APIs: Sockets and XTI, Vol 1, page 434.
139 len = 100 * sizeof(struct ifreq);
144 memset (buf, 0, len);
145 if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) {
146 if (errno != EINVAL || lastlen != 0) {
147 if (err_str != NULL) {
148 *err_str = g_strdup_printf(
149 "Can't get list of interfaces: SIOCGIFCONF ioctl error: %s",
155 if ((unsigned int) ifc.ifc_len < sizeof(struct ifreq)) {
156 if (err_str != NULL) {
158 "Can't get list of interfaces: SIOCGIFCONF ioctl gave too small return buffer");
162 if (ifc.ifc_len == lastlen)
163 break; /* success, len has not changed */
164 lastlen = ifc.ifc_len;
166 len += 10 * sizeof(struct ifreq); /* increment */
169 ifr = (struct ifreq *) ifc.ifc_req;
170 last = (struct ifreq *) ((char *) ifr + ifc.ifc_len);
173 * Skip entries that begin with "dummy", or that include
174 * a ":" (the latter are Solaris virtuals).
176 if (strncmp(ifr->ifr_name, "dummy", 5) == 0 ||
177 strchr(ifr->ifr_name, ':') != NULL)
181 * If we already have this interface name on the list,
182 * don't add it, but, if we don't already have an IP
183 * address for it, add that address (SIOCGIFCONF returns,
184 * at least on BSD-flavored systems, one entry per
185 * interface *address*; if an interface has multiple
186 * addresses, we get multiple entries for it).
188 user_data.name = ifr->ifr_name;
189 user_data.if_info = NULL;
190 g_list_foreach(il, search_for_if_cb, &user_data);
191 if (user_data.if_info != NULL) {
192 if_info_add_address(user_data.if_info, &ifr->ifr_addr);
197 * Get the interface flags.
199 memset(&ifrflags, 0, sizeof ifrflags);
200 g_strlcpy(ifrflags.ifr_name, ifr->ifr_name,
201 sizeof ifrflags.ifr_name);
202 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifrflags) < 0) {
205 if (err_str != NULL) {
206 *err_str = g_strdup_printf(
207 "Can't get list of interfaces: SIOCGIFFLAGS error getting flags for interface %s: %s",
208 ifr->ifr_name, g_strerror(errno));
214 * Skip interfaces that aren't up.
216 if (!(ifrflags.ifr_flags & IFF_UP))
220 * Skip interfaces that we can't open with "libpcap".
221 * Open with the minimum packet size - it appears that the
222 * IRIX SIOCSNOOPLEN "ioctl" may fail if the capture length
223 * supplied is too large, rather than just truncating it.
225 pch = pcap_open_live(ifr->ifr_name, MIN_PACKET_SIZE, 0, 0,
232 * If it's a loopback interface, add it at the end of the
233 * list, otherwise add it after the last non-loopback
234 * interface, so all loopback interfaces go at the end - we
235 * don't want a loopback interface to be the default capture
236 * device unless there are no non-loopback devices.
238 loopback = ((ifrflags.ifr_flags & IFF_LOOPBACK) ||
239 strncmp(ifr->ifr_name, "lo", 2) == 0);
240 if_info = if_info_new(ifr->ifr_name, NULL, loopback);
241 if_info_add_address(if_info, &ifr->ifr_addr);
243 il = g_list_append(il, if_info);
245 il = g_list_insert(il, if_info, nonloopback_pos);
247 * Insert the next non-loopback interface after this
255 ifr = (struct ifreq *) ((char *) ifr +
256 (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr) ?
257 ifr->ifr_addr.sa_len : sizeof(ifr->ifr_addr)) +
260 ifr = (struct ifreq *) ((char *) ifr + sizeof(struct ifreq));
266 * OK, maybe we have support for the "any" device, to do a cooked
267 * capture on all interfaces at once.
268 * Try opening it and, if that succeeds, add it to the end of
269 * the list of interfaces.
271 pch = pcap_open_live("any", MIN_PACKET_SIZE, 0, 0, errbuf);
274 * It worked; we can use the "any" device.
276 if_info = if_info_new("any",
277 "Pseudo-device that captures on all interfaces", FALSE);
278 il = g_list_insert(il, if_info, -1);
288 * No interfaces found.
290 *err = NO_INTERFACES_FOUND;
298 free_interface_list(il);
301 *err = CANT_GET_INTERFACE_LIST;
303 #endif /* HAVE_PCAP_FINDALLDEVS */
306 #ifndef HAVE_PCAP_FINDALLDEVS
308 search_for_if_cb(gpointer data, gpointer user_data)
310 struct search_user_data *search_user_data = user_data;
311 if_info_t *if_info = data;
313 if (strcmp(if_info->name, search_user_data->name) == 0)
314 search_user_data->if_info = if_info;
316 #endif /* HAVE_PCAP_FINDALLDEVS */
319 * Get an error message string for a CANT_GET_INTERFACE_LIST error from
320 * "get_interface_list()".
323 cant_get_if_list_error_message(const char *err_str)
325 return g_strdup_printf("Can't get list of interfaces: %s", err_str);
329 * Append the version of libpcap with which we were compiled to a GString.
332 get_compiled_pcap_version(GString *str)
335 * NOTE: in *some* flavors of UN*X, the data from a shared
336 * library might be linked into executable images that are
337 * linked with that shared library, in which case you could
338 * look at pcap_version[] to get the version with which
339 * the program was compiled.
341 * In other flavors of UN*X, that doesn't happen, so
342 * pcap_version[] gives you the version the program is
343 * running with, not the version it was built with, and,
344 * in at least some of them, if the length of a data item
345 * referred to by the executable - such as the pcap_version[]
346 * string - isn't the same in the version of the library
347 * with which the program was built and the version with
348 * which it was run, the run-time linker will complain,
351 * So, for now, we just give up on reporting the version
352 * of libpcap with which we were compiled.
354 g_string_append(str, "with libpcap");
358 * Append the version of libpcap with which we we're running to a GString.
361 get_runtime_pcap_version(GString *str)
363 g_string_append_printf(str, "with ");
364 #ifdef HAVE_PCAP_LIB_VERSION
365 g_string_append(str, pcap_lib_version());
367 g_string_append(str, "libpcap (version unknown)");
371 #else /* HAVE_LIBPCAP */
374 * Append an indication that we were not compiled with libpcap
378 get_compiled_pcap_version(GString *str)
380 g_string_append(str, "without libpcap");
384 * Don't append anything, as we weren't even compiled to use WinPcap.
387 get_runtime_pcap_version(GString *str _U_)
391 #endif /* HAVE_LIBPCAP */