forked from osmocom/wireshark
![Stig Bjørlykke](/assets/img/avatar_default.png)
Use common function to generate the interface display name, both when scanning for interfaces (scan_local_interfaces()) and when changing Comment in the Manage Interfaces dialog. Change-Id: I3260208856563aaf387ce397d4ae61bddcc89b4f Reviewed-on: https://code.wireshark.org/review/12362 Petri-Dish: Stig Bjørlykke <stig@bjorlykke.org> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Anders Broman <a.broman58@gmail.com>
658 lines
20 KiB
C
658 lines
20 KiB
C
/* capture_ui_utils.c
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* Utilities for capture user interfaces
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#ifdef HAVE_LIBPCAP
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include "epan/prefs.h"
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#include "epan/ex-opt.h"
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#include "caputils/capture_ifinfo.h"
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#include "ui/capture_ui_utils.h"
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#include "ui/capture_globals.h"
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#include "wiretap/wtap.h"
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#include "epan/to_str.h"
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/*
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* In a list of interface information, in the form of a comma-separated
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* list of {name}({property}) items, find the entry for a particular
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* interface, and return a pointer a g_malloced string containing
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* the property.
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*/
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static char *
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capture_dev_get_if_property(const gchar *pref, const gchar *if_name)
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{
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gchar **if_tokens;
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gchar *property = NULL;
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int i;
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if (if_name == NULL || strlen(if_name) < 1) {
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return NULL;
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}
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if (pref == NULL || strlen(pref) < 1) {
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/* There is no interface information list. */
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return NULL;
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}
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/*
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* Split the list into a sequence of items.
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*
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* XXX - this relies on the items not themselves containing commas.
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*/
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if_tokens = g_strsplit(pref, ",", -1);
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for (i = 0; if_tokens[i] != NULL; i++) {
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gchar *opening_parenp, *closing_parenp;
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/*
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* Separate this item into name and property.
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* The first opening parenthesis and the last closing parenthesis
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* surround the property. Any other parentheses are part of
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* the property.
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*/
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opening_parenp = strchr(if_tokens[i], '(');
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if (opening_parenp == NULL) {
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/* No opening parenthesis. Give up. */
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break;
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}
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closing_parenp = strrchr(if_tokens[i], ')');
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if (closing_parenp == NULL || closing_parenp <= opening_parenp) {
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/* No closing parenthesis or invalid input. Give up. */
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break;
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}
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*opening_parenp = '\0'; /* Split {name} from what follows */
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*closing_parenp = '\0'; /* Terminate {property} */
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if (strcmp(if_tokens[i], if_name) == 0) {
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if (strlen(opening_parenp + 1) > 0) {
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property = g_strdup(opening_parenp + 1);
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}
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break;
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}
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}
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g_strfreev(if_tokens);
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return property;
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}
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/*
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* Find a property that should be an integral value, and return the
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* value or, if it's not found or not a valid integral value, -1.
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*/
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static gint
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capture_dev_get_if_int_property(const gchar *pref, const gchar *if_name)
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{
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gchar *property_string, *next;
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long property;
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property_string = capture_dev_get_if_property(pref, if_name);
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if (property_string == NULL) {
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/* No property found for this interface. */
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return -1;
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}
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property = strtol(property_string, &next, 10);
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if (next == property_string || *next != '\0' || property < 0) {
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/* Syntax error */
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g_free(property_string);
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return -1;
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}
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if (property > G_MAXINT) {
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/* Value doesn't fit in a gint */
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g_free(property_string);
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return -1;
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}
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g_free(property_string);
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return (gint)property;
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}
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/*
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* Find user-specified capture device description that matches interface
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* name, if any.
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*/
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char *
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capture_dev_user_descr_find(const gchar *if_name)
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{
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return capture_dev_get_if_property(prefs.capture_devices_descr, if_name);
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}
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gint
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capture_dev_user_linktype_find(const gchar *if_name)
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{
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return capture_dev_get_if_int_property(prefs.capture_devices_linktypes, if_name);
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}
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#ifdef CAN_SET_CAPTURE_BUFFER_SIZE
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gint
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capture_dev_user_buffersize_find(const gchar *if_name)
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{
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return capture_dev_get_if_int_property(prefs.capture_devices_buffersize, if_name);
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}
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#endif
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gboolean
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capture_dev_user_snaplen_find(const gchar *if_name, gboolean *hassnap, int *snaplen)
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{
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gboolean found = FALSE;
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gchar **if_tokens;
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int i;
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if (if_name == NULL || strlen(if_name) < 1) {
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return FALSE;
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}
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if ((prefs.capture_devices_snaplen == NULL) ||
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(*prefs.capture_devices_snaplen == '\0')) {
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/* There are no snap lengths defined */
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return FALSE;
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}
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/*
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* Split the list into a sequence of items.
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*
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* XXX - this relies on the items not themselves containing commas.
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*/
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if_tokens = g_strsplit(prefs.capture_devices_snaplen, ",", -1);
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for (i = 0; if_tokens[i] != NULL; i++) {
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gchar *colonp, *next;
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long value;
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/*
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* This one's a bit ugly.
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* The syntax of the item is {name}:{hassnap}({snaplen}),
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* where {hassnap} is 0 if the interface shouldn't have a snapshot
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* length and 1 if it should, and {snaplen} is the maximum snapshot
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* length if {hassnap} is 0 and the specified snapshot length if
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* {hassnap} is 1.
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*
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* Sadly, : was a bad choice of separator, given that, on some OSes,
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* an interface can have a colon in its name.
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*
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* So we look for the *last* colon in the string.
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*/
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colonp = strrchr(if_tokens[i], ':');
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if (colonp == NULL) {
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/* No separating colon. Give up. */
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break;
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}
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*colonp = '\0'; /* Split {name} from what follows */
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if (strcmp(if_tokens[i], if_name) == 0) {
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/* OK, this matches. */
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if (*(colonp + 1) == '0') {
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/* {hassnap} is false, so just set the snaplen to WTAP_MAX_PACKET_SIZE. */
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found = TRUE;
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*hassnap = FALSE;
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*snaplen = WTAP_MAX_PACKET_SIZE;
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} else if (*(colonp + 1) == '1') {
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/* {hassnap} is true, so extract {snaplen} */
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if (*(colonp + 2) != '(') {
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/* Not followed by a parenthesis. Give up. */
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break;
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}
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value = strtol(colonp + 3, &next, 10);
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if (next == colonp + 3 || *next != ')' || value < 0) {
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/* Syntax error. Give up. */
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break;
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}
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if (value > G_MAXINT) {
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/* Value doesn't fit in a gint. Give up. */
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break;
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}
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found = TRUE;
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*hassnap = TRUE;
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*snaplen = (gint)value;
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} else {
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/* Bad {hassnap}. Give up. */
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break;
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}
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break;
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}
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}
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g_strfreev(if_tokens);
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return found;
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}
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gboolean
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capture_dev_user_pmode_find(const gchar *if_name, gboolean *pmode)
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{
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int value;
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value = capture_dev_get_if_int_property(prefs.capture_devices_pmode, if_name);
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if (value == -1) {
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/* Not found or bad. */
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return FALSE;
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}
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*pmode = (value != 0);
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return TRUE;
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}
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gchar*
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capture_dev_user_cfilter_find(const gchar *if_name)
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{
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return capture_dev_get_if_property(prefs.capture_devices_filter, if_name);
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}
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/*
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* Return as descriptive a name for an interface as we can get.
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* If the user has specified a comment, use that. Otherwise,
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* if capture_interface_list() supplies a description, use that,
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* otherwise use the interface name.
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*
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* The result must be g_free()'d when you're done with it.
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*
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* Note: given that this calls capture_interface_list(), which attempts to
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* open all adapters it finds in order to check whether they can be
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* captured on, this is an expensive routine to call, so don't call it
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* frequently.
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*/
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char *
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get_interface_descriptive_name(const char *if_name)
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{
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char *descr;
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GList *if_list;
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GList *if_entry;
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if_info_t *if_info;
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int err;
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/* Do we have a user-supplied description? */
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descr = capture_dev_user_descr_find(if_name);
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if (descr == NULL) {
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/* No; try to construct a descriptive name. */
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if (strcmp(if_name, "-") == 0) {
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/*
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* Strictly speaking, -X (extension) options are for modules, e.g. Lua
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* and using one here stretches that definition. However, this doesn't
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* waste a single-letter option on something that might be rarely used
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* and is backward-compatible to 1.0.
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*/
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descr = g_strdup(ex_opt_get_nth("stdin_descr", 0));
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if (!descr) {
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descr = g_strdup("Standard input");
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}
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} else {
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/* No, we don't have a user-supplied description; did we get
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one from the OS or libpcap? */
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descr = NULL;
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if_list = capture_interface_list(&err, NULL, NULL);
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if (if_list != NULL) {
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if_entry = if_list;
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do {
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if_info = (if_info_t *)if_entry->data;
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if (strcmp(if_info->name, if_name) == 0) {
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if (if_info->friendly_name != NULL) {
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/* We have a "friendly name"; return a copy of that
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as the description - when we free the interface
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list, that'll also free up the strings to which
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it refers. */
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descr = g_strdup(if_info->friendly_name);
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} else if (if_info->vendor_description != NULL) {
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/* We have no "friendly name", but we have a vendor
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description; return a copy of that - when we free
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the interface list, that'll also free up the strings
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to which it refers. */
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descr = g_strdup(if_info->vendor_description);
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}
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break;
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}
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} while ((if_entry = g_list_next(if_entry)) != NULL);
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}
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free_interface_list(if_list);
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if (descr == NULL) {
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/* The interface name is all we have, so just return a copy of that. */
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descr = g_strdup(if_name);
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}
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}
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}
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return descr;
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}
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GList *
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build_capture_combo_list(GList *if_list, gboolean do_hide)
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{
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GList *combo_list;
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GList *if_entry;
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if_info_t *if_info;
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char *if_string;
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gchar *descr;
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combo_list = NULL;
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if (if_list != NULL) {
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/* Scan through the list and build a list of strings to display. */
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for (if_entry = if_list; if_entry != NULL;
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if_entry = g_list_next(if_entry)) {
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if_info = (if_info_t *)if_entry->data;
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/* Is this interface hidden and, if so, should we include it
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anyway? */
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if (!prefs_is_capture_device_hidden(if_info->name) || !do_hide) {
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/* It's not hidden, or it is but we should include it in the list. */
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/* Do we have a user-supplied description? */
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descr = capture_dev_user_descr_find(if_info->name);
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if (descr != NULL) {
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/* Yes, we have a user-supplied description; use it. */
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if_string = g_strdup_printf("%s: %s", descr, if_info->name);
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g_free(descr);
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} else {
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/* No, we don't have a user-supplied description; did we get
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one from the OS or libpcap? */
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if (if_info->vendor_description != NULL) {
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/* Yes - use it. */
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if_string = g_strdup_printf("%s: %s",
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if_info->vendor_description,
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if_info->name);
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} else {
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/* No. */
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if_string = g_strdup(if_info->name);
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}
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}
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combo_list = g_list_append(combo_list, if_string);
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}
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}/*for*/
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}
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return combo_list;
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}
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static void
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free_if_string(gpointer data, gpointer user_data _U_)
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{
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g_free(data);
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}
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void
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free_capture_combo_list(GList *combo_list)
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{
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if (combo_list != NULL) {
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g_list_foreach(combo_list, free_if_string, NULL);
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g_list_free(combo_list);
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}
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}
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/*
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* Given text that contains an interface name possibly prefixed by an
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* interface description, extract the interface name.
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*/
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const char *
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get_if_name(const char *if_text)
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{
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const char *if_name;
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#ifdef _WIN32
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/*
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* We cannot assume that the interface name doesn't contain a space;
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* some names on Windows OT do.
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*
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* We also can't assume it begins with "\Device\", either, as, on
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* Windows OT, WinPcap doesn't put "\Device\" in front of the name.
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*
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* As I remember, we can't assume that the interface description
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* doesn't contain a colon, either; I think some do.
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*
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* We can probably assume that the interface *name* doesn't contain
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* a colon, however; if any interface name does contain a colon on
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* Windows, it'll be time to just get rid of the damn interface
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* descriptions in the drop-down list, have just the names in the
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* drop-down list, and have a "Browse..." button to browse for interfaces,
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* with names, descriptions, IP addresses, blah blah blah available when
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* possible.
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*
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* So we search backwards for a colon. If we don't find it, just
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* return the entire string; otherwise, skip the colon and any blanks
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* after it, and return that string.
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*/
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if_name = if_text + strlen(if_text);
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for (;;) {
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if (if_name == if_text) {
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/* We're at the beginning of the string; return it. */
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break;
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}
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if_name--;
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if (*if_name == ':') {
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/*
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* We've found a colon.
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* Unfortunately, a colon is used in the string "rpcap://",
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* which is used in case of a remote capture.
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* So we'll check to make sure the colon isn't followed by "//";
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* it'll be followed by a blank if it separates the description
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* and the interface name. (We don't wire in "rpcap", in case we
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* support other protocols in the same syntax.)
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* Unfortunately, another colon can be used in "rpcap://host:port/"
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* before port. Check if colon is followed by digit.
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*/
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if ((strncmp(if_name, "://", 3) != 0) && !g_ascii_isdigit(if_name[1])) {
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/*
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* OK, we've found a colon followed neither by "//" nor by digit.
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* Skip blanks following it.
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*/
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if_name++;
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while (*if_name == ' ')
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if_name++;
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break;
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}
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}
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/* Keep looking for a colon not followed by "//". */
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}
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#else
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/*
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* There's a space between the interface description and name, and
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* the interface name shouldn't have a space in it (it doesn't, on
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* UNIX systems); look backwards in the string for a space.
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*
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* (An interface name might, however, contain a colon in it, which
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* is why we don't use the colon search on UNIX.)
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*/
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if_name = strrchr(if_text, ' ');
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if (if_name == NULL) {
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if_name = if_text;
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} else {
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if_name++;
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}
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#endif
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return if_name;
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}
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/* Return interface_opts->descr (after setting it if it is not set)
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* This is necessary because capture_opts.c can't set descr (at least
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* not without adding significant dependencies there).
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*/
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const char *
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get_iface_description_for_interface(capture_options *capture_opts, guint i)
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{
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interface_options interface_opts;
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if (i < capture_opts->ifaces->len) {
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interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
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if (!interface_opts.descr && interface_opts.name) {
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interface_opts.descr = get_interface_descriptive_name(interface_opts.name);
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capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
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g_array_insert_val(capture_opts->ifaces, i, interface_opts);
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}
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return (interface_opts.descr);
|
|
} else {
|
|
return (NULL);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set the active DLT for a device appropriately.
|
|
*/
|
|
void
|
|
set_active_dlt(interface_t *device, int global_default_dlt)
|
|
{
|
|
GList *list;
|
|
gboolean found_active_dlt;
|
|
link_row *link;
|
|
|
|
/*
|
|
* If there's a preference for the link-layer header type for
|
|
* this interface, use it. If not, use the all-interface
|
|
* default; if that's not set on the command line, that will
|
|
* be -1, meaning "use per-interface defaults", otherwise
|
|
* we'll fail if it's not one of the types the interface
|
|
* supports.
|
|
*/
|
|
if ((device->active_dlt = capture_dev_user_linktype_find(device->name)) == -1) {
|
|
device->active_dlt = global_default_dlt;
|
|
}
|
|
|
|
/*
|
|
* Is that one of the supported link-layer header types?
|
|
* If not, set it to -1, so we'll fall back on the first supported
|
|
* link-layer header type.
|
|
*/
|
|
found_active_dlt = FALSE;
|
|
for (list = device->links; list != NULL; list = g_list_next(list)) {
|
|
link = (link_row *)(list->data);
|
|
if (link->dlt != -1 && link->dlt == device->active_dlt) {
|
|
found_active_dlt = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
if (!found_active_dlt) {
|
|
device->active_dlt = -1;
|
|
}
|
|
if (device->active_dlt == -1) {
|
|
/* Fall back on the first supported DLT, if we have one. */
|
|
for (list = device->links; list != NULL; list = g_list_next(list)) {
|
|
link = (link_row *)(list->data);
|
|
if (link->dlt != -1) {
|
|
device->active_dlt = link->dlt;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
GString *
|
|
get_iface_list_string(capture_options *capture_opts, guint32 style)
|
|
{
|
|
GString *iface_list_string = g_string_new("");
|
|
guint i;
|
|
|
|
/*
|
|
* If we have a descriptive name for the interface, show that,
|
|
* rather than its raw name. On NT 5.x (2K/XP/Server2K3), the
|
|
* interface name is something like "\Device\NPF_{242423..."
|
|
* which is pretty useless to the normal user. On other platforms,
|
|
* it might be less cryptic, but if a more descriptive name is
|
|
* available, we should still use that.
|
|
*/
|
|
#ifdef _WIN32
|
|
if (capture_opts->ifaces->len < 2) {
|
|
#else
|
|
if (capture_opts->ifaces->len < 4) {
|
|
#endif
|
|
for (i = 0; i < capture_opts->ifaces->len; i++) {
|
|
if (i > 0) {
|
|
if (capture_opts->ifaces->len > 2) {
|
|
g_string_append_printf(iface_list_string, ",");
|
|
}
|
|
g_string_append_printf(iface_list_string, " ");
|
|
if (i == capture_opts->ifaces->len - 1) {
|
|
g_string_append_printf(iface_list_string, "and ");
|
|
}
|
|
}
|
|
if (style & IFLIST_QUOTE_IF_DESCRIPTION)
|
|
g_string_append_printf(iface_list_string, "'");
|
|
g_string_append_printf(iface_list_string, "%s", get_iface_description_for_interface(capture_opts, i));
|
|
if (style & IFLIST_QUOTE_IF_DESCRIPTION)
|
|
g_string_append_printf(iface_list_string, "'");
|
|
if (style & IFLIST_SHOW_FILTER) {
|
|
interface_options interface_opts;
|
|
|
|
interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
|
|
if (interface_opts.cfilter != NULL &&
|
|
strlen(interface_opts.cfilter) > 0) {
|
|
g_string_append_printf(iface_list_string, " (%s)", interface_opts.cfilter);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
g_string_append_printf(iface_list_string, "%u interfaces", capture_opts->ifaces->len);
|
|
}
|
|
return iface_list_string;
|
|
}
|
|
|
|
gchar *
|
|
get_iface_display_name(const gchar *description, const if_info_t *if_info)
|
|
{
|
|
if (description && description[0]) {
|
|
/* We have a user-supplied description. */
|
|
#ifdef _WIN32
|
|
gchar *if_string = if_info->friendly_name ? if_info->friendly_name : if_info->name;
|
|
return g_strdup_printf("%s: %s", description, if_string);
|
|
#else
|
|
return g_strdup_printf("%s: %s", description, if_info->name);
|
|
#endif
|
|
}
|
|
|
|
if (if_info->friendly_name) {
|
|
/* We have a friendly name from the OS. */
|
|
#ifdef _WIN32
|
|
/*
|
|
* On Windows, if we have a friendly name, just show it,
|
|
* don't show the name, as that's a string made out of
|
|
* the device GUID, and not at all friendly.
|
|
*/
|
|
return g_strdup_printf("%s", if_info->friendly_name);
|
|
#else
|
|
/*
|
|
* On UN*X, if we have a friendly name, show it along
|
|
* with the interface name; the interface name is short
|
|
* and somewhat friendly, and many UN*X users are used
|
|
* to interface names, so we should show it.
|
|
*/
|
|
return g_strdup_printf("%s: %s", if_info->friendly_name, if_info->name);
|
|
#endif
|
|
}
|
|
|
|
if (if_info->vendor_description) {
|
|
/* We have a device description from libpcap. */
|
|
return g_strdup_printf("%s: %s", if_info->vendor_description, if_info->name);
|
|
}
|
|
|
|
/* No additional descriptions found. */
|
|
return g_strdup(if_info->name);
|
|
}
|
|
|
|
#endif /* HAVE_LIBPCAP */
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 2
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* ex: set shiftwidth=2 tabstop=8 expandtab:
|
|
* :indentSize=2:tabSize=8:noTabs=true:
|
|
*/
|