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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
42 #ifdef HAVE_SYS_SOCKET_H
43 #include <sys/socket.h>
46 #ifdef HAVE_SYS_IOCTL_H
47 #include <sys/ioctl.h>
53 * Keep Digital UNIX happy when including <net/if.h>.
59 #ifdef HAVE_SYS_SOCKIO_H
60 # include <sys/sockio.h>
63 #include "capture-pcap-util.h"
64 #include "capture-pcap-util-int.h"
66 #ifndef HAVE_PCAP_FINDALLDEVS
67 struct search_user_data {
73 search_for_if_cb(gpointer data, gpointer user_data);
76 #ifdef HAVE_PCAP_REMOTE
78 get_remote_interface_list(const char *hostname, const char *port,
79 int auth_type, const char *username,
80 const char *passwd, int *err, char **err_str)
82 struct pcap_rmtauth auth;
83 char source[PCAP_BUF_SIZE];
84 char errbuf[PCAP_ERRBUF_SIZE];
87 if (pcap_createsrcstr(source, PCAP_SRC_IFREMOTE, hostname, port,
88 NULL, errbuf) == -1) {
89 *err = CANT_GET_INTERFACE_LIST;
91 *err_str = cant_get_if_list_error_message(errbuf);
95 auth.type = auth_type;
96 auth.username = g_strdup(username);
97 auth.password = g_strdup(passwd);
99 result = get_interface_list_findalldevs_ex(source, &auth, err, err_str);
100 g_free(auth.username);
101 g_free(auth.password);
108 get_interface_list(int *err, char **err_str)
110 #ifdef HAVE_PCAP_FINDALLDEVS
111 return get_interface_list_findalldevs(err, err_str);
114 gint nonloopback_pos = 0;
115 struct ifreq *ifr, *last;
117 struct ifreq ifrflags;
118 int sock = socket(AF_INET, SOCK_DGRAM, 0);
119 struct search_user_data user_data;
124 char errbuf[PCAP_ERRBUF_SIZE];
127 *err = CANT_GET_INTERFACE_LIST;
128 if (err_str != NULL) {
129 *err_str = g_strdup_printf(
130 "Can't get list of interfaces: error opening socket: %s",
137 * This code came from: W. Richard Stevens: "UNIX Network Programming",
138 * Networking APIs: Sockets and XTI, Vol 1, page 434.
141 len = 100 * sizeof(struct ifreq);
146 memset (buf, 0, len);
147 if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) {
148 if (errno != EINVAL || lastlen != 0) {
149 if (err_str != NULL) {
150 *err_str = g_strdup_printf(
151 "Can't get list of interfaces: SIOCGIFCONF ioctl error: %s",
157 if ((unsigned) ifc.ifc_len < sizeof(struct ifreq)) {
158 if (err_str != NULL) {
160 "Can't get list of interfaces: SIOCGIFCONF ioctl gave too small return buffer");
164 if (ifc.ifc_len == lastlen)
165 break; /* success, len has not changed */
166 lastlen = ifc.ifc_len;
168 len += 10 * sizeof(struct ifreq); /* increment */
171 ifr = (struct ifreq *) ifc.ifc_req;
172 last = (struct ifreq *) ((char *) ifr + ifc.ifc_len);
175 * Skip entries that begin with "dummy", or that include
176 * a ":" (the latter are Solaris virtuals).
178 if (strncmp(ifr->ifr_name, "dummy", 5) == 0 ||
179 strchr(ifr->ifr_name, ':') != NULL)
183 * If we already have this interface name on the list,
184 * don't add it, but, if we don't already have an IP
185 * address for it, add that address (SIOCGIFCONF returns,
186 * at least on BSD-flavored systems, one entry per
187 * interface *address*; if an interface has multiple
188 * addresses, we get multiple entries for it).
190 user_data.name = ifr->ifr_name;
191 user_data.if_info = NULL;
192 g_list_foreach(il, search_for_if_cb, &user_data);
193 if (user_data.if_info != NULL) {
194 if_info_add_address(user_data.if_info, &ifr->ifr_addr);
199 * Get the interface flags.
201 memset(&ifrflags, 0, sizeof ifrflags);
202 g_strlcpy(ifrflags.ifr_name, ifr->ifr_name,
203 sizeof ifrflags.ifr_name);
204 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifrflags) < 0) {
207 if (err_str != NULL) {
208 *err_str = g_strdup_printf(
209 "Can't get list of interfaces: SIOCGIFFLAGS error getting flags for interface %s: %s",
210 ifr->ifr_name, strerror(errno));
216 * Skip interfaces that aren't up.
218 if (!(ifrflags.ifr_flags & IFF_UP))
222 * Skip interfaces that we can't open with "libpcap".
223 * Open with the minimum packet size - it appears that the
224 * IRIX SIOCSNOOPLEN "ioctl" may fail if the capture length
225 * supplied is too large, rather than just truncating it.
227 pch = pcap_open_live(ifr->ifr_name, MIN_PACKET_SIZE, 0, 0,
234 * If it's a loopback interface, add it at the end of the
235 * list, otherwise add it after the last non-loopback
236 * interface, so all loopback interfaces go at the end - we
237 * don't want a loopback interface to be the default capture
238 * device unless there are no non-loopback devices.
240 if_info = if_info_new(ifr->ifr_name, NULL);
241 if_info_add_address(if_info, &ifr->ifr_addr);
242 if ((ifrflags.ifr_flags & IFF_LOOPBACK) ||
243 strncmp(ifr->ifr_name, "lo", 2) == 0) {
244 if_info->loopback = TRUE;
245 il = g_list_append(il, if_info);
247 if_info->loopback = FALSE;
248 il = g_list_insert(il, if_info, nonloopback_pos);
250 * Insert the next non-loopback interface after this
258 ifr = (struct ifreq *) ((char *) ifr +
259 (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr) ?
260 ifr->ifr_addr.sa_len : sizeof(ifr->ifr_addr)) +
263 ifr = (struct ifreq *) ((char *) ifr + sizeof(struct ifreq));
269 * OK, maybe we have support for the "any" device, to do a cooked
270 * capture on all interfaces at once.
271 * Try opening it and, if that succeeds, add it to the end of
272 * the list of interfaces.
274 pch = pcap_open_live("any", MIN_PACKET_SIZE, 0, 0, errbuf);
277 * It worked; we can use the "any" device.
279 if_info = if_info_new("any",
280 "Pseudo-device that captures on all interfaces");
281 il = g_list_insert(il, if_info, -1);
291 * No interfaces found.
293 *err = NO_INTERFACES_FOUND;
301 free_interface_list(il);
304 *err = CANT_GET_INTERFACE_LIST;
306 #endif /* HAVE_PCAP_FINDALLDEVS */
309 #ifndef HAVE_PCAP_FINDALLDEVS
311 search_for_if_cb(gpointer data, gpointer user_data)
313 struct search_user_data *search_user_data = user_data;
314 if_info_t *if_info = data;
316 if (strcmp(if_info->name, search_user_data->name) == 0)
317 search_user_data->if_info = if_info;
319 #endif /* HAVE_PCAP_FINDALLDEVS */
322 * Get an error message string for a CANT_GET_INTERFACE_LIST error from
323 * "get_interface_list()".
326 cant_get_if_list_error_message(const char *err_str)
328 return g_strdup_printf("Can't get list of interfaces: %s", err_str);
332 * Append the version of libpcap with which we were compiled to a GString.
335 get_compiled_pcap_version(GString *str)
337 #ifdef HAVE_PCAP_VERSION
338 extern char pcap_version[];
340 g_string_append_printf(str, "with libpcap %s", pcap_version);
342 g_string_append(str, "with libpcap (version unknown)");
347 * Append the version of libpcap with which we we're running to a GString.
350 get_runtime_pcap_version(GString *str)
352 g_string_append_printf(str, "with ");
353 #ifdef HAVE_PCAP_LIB_VERSION
354 g_string_append(str, pcap_lib_version());
356 g_string_append(str, "libpcap (version unknown)");
360 #else /* HAVE_LIBPCAP */
363 * Append an indication that we were not compiled with libpcap
367 get_compiled_pcap_version(GString *str)
369 g_string_append(str, "without libpcap");
373 * Don't append anything, as we weren't even compiled to use WinPcap.
376 get_runtime_pcap_version(GString *str _U_)
380 #endif /* HAVE_LIBPCAP */