2 * Utilities for capture user interfaces
6 * Ethereal - Network traffic analyzer
7 * By Gerald Combs <gerald@ethereal.com>
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.
25 /* With MSVC and a libethereal.dll this file needs to import some variables
26 in a special way. Therefore _NEED_VAR_IMPORT_ is defined. */
27 #define _NEED_VAR_IMPORT_
39 #include <epan/prefs.h>
40 #include "pcap-util.h"
41 #include "capture_ui_utils.h"
44 * Find user-specified capture device description that matches interface
48 capture_dev_user_descr_find(const gchar *if_name)
56 if (prefs.capture_devices_descr == NULL) {
57 /* There are no descriptions. */
61 if ((p = strstr(prefs.capture_devices_descr, if_name)) == NULL) {
62 /* There are, but there isn't one for this interface. */
67 /* error: ran into next interface description */
70 /* found left parenthesis, start of description */
74 /* skip over left parenthesis */
76 /* save pointer to beginning of description */
81 /* end of description */
90 if ((lp == 1) && (ct > 0) && (p2 != NULL)) {
91 /* Allocate enough space to return the string,
92 which runs from p2 to p, plus a terminating
94 descr = g_malloc(p - p2 + 1);
95 memcpy(descr, p2, p - p2);
104 * Return as descriptive a name for an interface as we can get.
105 * If the user has specified a comment, use that. Otherwise,
106 * if get_interface_list() supplies a description, use that,
107 * otherwise use the interface name.
110 get_interface_descriptive_name(const char *if_name)
117 char err_buf[PCAP_ERRBUF_SIZE];
119 /* Do we have a user-supplied description? */
120 descr = capture_dev_user_descr_find(if_name);
122 /* Yes - make a copy of that. */
123 descr = g_strdup(descr);
125 /* No, we don't have a user-supplied description; did we get
126 one from the OS or libpcap? */
128 if_list = get_interface_list(&err, err_buf);
129 if (if_list != NULL) {
132 if_info = if_entry->data;
133 if (strcmp(if_info->name, if_name) == 0) {
134 if (if_info->description != NULL) {
135 /* Return a copy of that - when we free the interface
136 list, that'll also free up the strings to which
138 descr = g_strdup(if_info->description);
142 } while ((if_entry = g_list_next(if_entry)) != NULL);
144 free_interface_list(if_list);
147 /* The interface name is all we have, so just return a copy of that. */
148 descr = g_strdup(if_name);
156 build_capture_combo_list(GList *if_list, gboolean do_hide)
165 if (if_list != NULL) {
166 /* Scan through the list and build a list of strings to display. */
167 for (if_entry = if_list; if_entry != NULL;
168 if_entry = g_list_next(if_entry)) {
169 if_info = if_entry->data;
171 /* Is this interface hidden and, if so, should we include it
173 if (prefs.capture_devices_hide == NULL ||
174 strstr(prefs.capture_devices_hide, if_info->name) == NULL ||
176 /* It's not hidden, or it is but we should include it in the list. */
178 /* Do we have a user-supplied description? */
179 descr = capture_dev_user_descr_find(if_info->name);
181 /* Yes, we have a user-supplied description; use it. */
182 if_string = g_strdup_printf("%s: %s", descr, if_info->name);
185 /* No, we don't have a user-supplied description; did we get
186 one from the OS or libpcap? */
187 if (if_info->description != NULL) {
189 if_string = g_strdup_printf("%s: %s", if_info->description,
193 if_string = g_strdup(if_info->name);
196 combo_list = g_list_append(combo_list, if_string);
204 free_if_string(gpointer data, gpointer user_data _U_)
210 free_capture_combo_list(GList *combo_list)
212 if (combo_list != NULL) {
213 g_list_foreach(combo_list, free_if_string, NULL);
214 g_list_free(combo_list);
219 * Given text that contains an interface name possibly prefixed by an
220 * interface description, extract the interface name.
223 get_if_name(char *if_text)
229 * We cannot assume that the interface name doesn't contain a space;
230 * some names on Windows OT do.
232 * We also can't assume it begins with "\Device\", either, as, on
233 * Windows OT, WinPcap doesn't put "\Device\" in front of the name.
235 * As I remember, we can't assume that the interface description
236 * doesn't contain a colon, either; I think some do.
238 * We can probably assume that the interface *name* doesn't contain
239 * a colon, however; if any interface name does contain a colon on
240 * Windows, it'll be time to just get rid of the damn interface
241 * descriptions in the drop-down list, have just the names in the
242 * drop-down list, and have a "Browse..." button to browse for interfaces,
243 * with names, descriptions, IP addresses, blah blah blah available when
246 * So we search backwards for a colon. If we don't find it, just
247 * return the entire string; otherwise, skip the colon and any blanks
248 * after it, and return that string.
250 if_name = if_text + strlen(if_text);
252 if (if_name == if_text) {
253 /* We're at the beginning of the string; return it. */
257 if (*if_name == ':') {
259 * We've found a colon.
260 * Unfortunately, a colon is used in the string "rpcap://",
261 * which is used in case of a remote capture.
262 * So we'll check to make sure the colon isn't followed by "//";
263 * it'll be followed by a blank if it separates the description
264 * and the interface name. (We don't wire in "rpcap", in case we
265 * support other protocols in the same syntax.)
267 if (strncmp(if_name, "://", 3) != 0) {
269 * OK, we've found a colon not followed by "//". Skip blanks
273 while (*if_name == ' ')
278 /* Keep looking for a colon not followed by "//". */
282 * There's a space between the interface description and name, and
283 * the interface name shouldn't have a space in it (it doesn't, on
284 * UNIX systems); look backwards in the string for a space.
286 * (An interface name might, however, contain a colon in it, which
287 * is why we don't use the colon search on UNIX.)
289 if_name = strrchr(if_text, ' ');
290 if (if_name == NULL) {
299 #endif /* HAVE_LIBPCAP */