![Stig Bjørlykke](/assets/img/avatar_default.png)
Remove any '%<interface>' from default filter. Wireshark prepares unparseable default filter when it's started under 'ssh <link-local ipv6 address>%<interface name>' - '%' in SSH_CONNECTION is not allowed filter. Let's cut the '%<interface name>' from any IP addresses in default filters. svn path=/trunk/; revision=33349
347 lines
10 KiB
C
347 lines
10 KiB
C
/* util.c
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* Utility routines
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*
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* $Id$
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <epan/address.h>
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#include <epan/addr_resolv.h>
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#include <epan/strutil.h>
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#include "util.h"
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/*
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* Collect command-line arguments as a string consisting of the arguments,
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* separated by spaces.
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*/
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char *
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get_args_as_string(int argc, char **argv, int optindex)
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{
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int len;
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int i;
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char *argstring;
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/*
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* Find out how long the string will be.
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*/
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len = 0;
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for (i = optindex; i < argc; i++) {
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len += (int) strlen(argv[i]);
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len++; /* space, or '\0' if this is the last argument */
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}
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/*
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* Allocate the buffer for the string.
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*/
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argstring = (char *)g_malloc(len);
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/*
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* Now construct the string.
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*/
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argstring[0] = '\0';
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i = optindex;
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for (;;) {
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g_strlcat(argstring, argv[i], len);
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i++;
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if (i == argc)
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break;
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g_strlcat(argstring, " ", len);
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}
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return argstring;
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}
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/* Compute the difference between two seconds/microseconds time stamps. */
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void
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compute_timestamp_diff(gint *diffsec, gint *diffusec,
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guint32 sec1, guint32 usec1, guint32 sec2, guint32 usec2)
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{
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if (sec1 == sec2) {
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/* The seconds part of the first time is the same as the seconds
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part of the second time, so if the microseconds part of the first
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time is less than the microseconds part of the second time, the
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first time is before the second time. The microseconds part of
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the delta should just be the difference between the microseconds
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part of the first time and the microseconds part of the second
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time; don't adjust the seconds part of the delta, as it's OK if
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the microseconds part is negative. */
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*diffsec = sec1 - sec2;
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*diffusec = usec1 - usec2;
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} else if (sec1 <= sec2) {
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/* The seconds part of the first time is less than the seconds part
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of the second time, so the first time is before the second time.
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Both the "seconds" and "microseconds" value of the delta
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should have the same sign, so if the difference between the
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microseconds values would be *positive*, subtract 1,000,000
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from it, and add one to the seconds value. */
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*diffsec = sec1 - sec2;
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if (usec2 >= usec1) {
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*diffusec = usec1 - usec2;
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} else {
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*diffusec = (usec1 - 1000000) - usec2;
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(*diffsec)++;
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}
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} else {
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/* Oh, good, we're not caught in a chronosynclastic infindibulum. */
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*diffsec = sec1 - sec2;
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if (usec2 <= usec1) {
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*diffusec = usec1 - usec2;
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} else {
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*diffusec = (usec1 + 1000000) - usec2;
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(*diffsec)--;
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}
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}
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}
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/* Remove any %<interface_name> from an IP address. */
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char *sanitize_filter_ip(char *hostname) {
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gchar *end;
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gchar *ret;
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ret = g_strdup(hostname);
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if (!ret)
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return NULL;
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end = strchr(ret, '%');
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if (end)
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*end = '\0';
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return ret;
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}
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/* Try to figure out if we're remotely connected, e.g. via ssh or
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Terminal Server, and create a capture filter that matches aspects of the
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connection. We match the following environment variables:
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SSH_CONNECTION (ssh): <remote IP> <remote port> <local IP> <local port>
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SSH_CLIENT (ssh): <remote IP> <remote port> <local port>
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REMOTEHOST (tcsh, others?): <remote name>
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DISPLAY (x11): [remote name]:<display num>
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SESSIONNAME (terminal server): <remote name>
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*/
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const gchar *get_conn_cfilter(void) {
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static GString *filter_str = NULL;
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gchar *env, **tokens;
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char *lastp, *lastc, *p;
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char *pprotocol = NULL;
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char *phostname = NULL;
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size_t hostlen;
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char *remip, *locip;
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if (filter_str == NULL) {
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filter_str = g_string_new("");
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}
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if ((env = getenv("SSH_CONNECTION")) != NULL) {
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tokens = g_strsplit(env, " ", 4);
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if (tokens[3]) {
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remip = sanitize_filter_ip(tokens[0]);
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locip = sanitize_filter_ip(tokens[2]);
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g_string_printf(filter_str, "not (tcp port %s and %s host %s "
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"and tcp port %s and %s host %s)", tokens[1], host_ip_af(remip), remip,
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tokens[3], host_ip_af(locip), locip);
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g_free(remip);
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g_free(locip);
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return filter_str->str;
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}
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} else if ((env = getenv("SSH_CLIENT")) != NULL) {
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tokens = g_strsplit(env, " ", 3);
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remip = sanitize_filter_ip(tokens[2]);
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g_string_printf(filter_str, "not (tcp port %s and %s host %s "
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"and tcp port %s)", tokens[1], host_ip_af(remip), tokens[0], remip);
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g_free(remip);
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return filter_str->str;
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} else if ((env = getenv("REMOTEHOST")) != NULL) {
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/* FreeBSD 7.0 sets REMOTEHOST to an empty string */
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if (g_ascii_strcasecmp(env, "localhost") == 0 ||
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strcmp(env, "127.0.0.1") == 0 ||
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strcmp(env, "") == 0) {
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return "";
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}
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remip = sanitize_filter_ip(env);
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g_string_printf(filter_str, "not %s host %s", host_ip_af(remip), remip);
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g_free(remip);
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return filter_str->str;
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} else if ((env = getenv("DISPLAY")) != NULL) {
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/*
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* This mirrors what _X11TransConnectDisplay() does.
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* Note that, on some systems, the hostname can
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* begin with "/", which means that it's a pathname
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* of a UNIX domain socket to connect to.
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*
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* The comments mirror those in _X11TransConnectDisplay(),
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* too. :-)
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*
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* Display names may be of the following format:
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*
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* [protoco./] [hostname] : [:] displaynumber [.screennumber]
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*
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* A string with exactly two colons separating hostname
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* from the display indicates a DECnet style name. Colons
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* in the hostname may occur if an IPv6 numeric address
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* is used as the hostname. An IPv6 numeric address may
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* also end in a double colon, so three colons in a row
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* indicates an IPv6 address ending in :: followed by
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* :display. To make it easier for people to read, an
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* IPv6 numeric address hostname may be surrounded by []
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* in a similar fashion to the IPv6 numeric address URL
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* syntax defined by IETF RFC 2732.
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*
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* If no hostname and no protocol is specified, the string
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* is interpreted as the most efficient local connection
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* to a server on the same machine. This is usually:
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*
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* o shared memory
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* o local stream
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* o UNIX domain socket
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* o TCP to local host.
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*/
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p = env;
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/*
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* Step 0, find the protocol. This is delimited by
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* the optional slash ('/').
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*/
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for (lastp = p; *p != '\0' && *p != ':' && *p != '/'; p++)
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;
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if (*p == '\0')
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return ""; /* must have a colon */
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if (p != lastp && *p != ':') { /* protocol given? */
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/* Yes */
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pprotocol = p;
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/* Is it TCP? */
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if (p - lastp != 3 || g_ascii_strncasecmp(lastp, "tcp", 3) != 0)
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return ""; /* not TCP */
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p++; /* skip the '/' */
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} else
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p = env; /* reset the pointer in
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case no protocol was given */
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/*
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* Step 1, find the hostname. This is delimited either by
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* one colon, or two colons in the case of DECnet (DECnet
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* Phase V allows a single colon in the hostname). (See
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* note above regarding IPv6 numeric addresses with
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* triple colons or [] brackets.)
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*/
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lastp = p;
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lastc = NULL;
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for (; *p != '\0'; p++)
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if (*p == ':')
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lastc = p;
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if (lastc == NULL)
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return ""; /* must have a colon */
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if ((lastp != lastc) && (*(lastc - 1) == ':')
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&& (((lastc - 1) == lastp) || (*(lastc - 2) != ':'))) {
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/* DECnet display specified */
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return "";
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} else
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hostlen = lastc - lastp;
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if (hostlen == 0)
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return ""; /* no hostname supplied */
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phostname = (char *)g_malloc(hostlen + 1);
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memcpy(phostname, lastp, hostlen);
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phostname[hostlen] = '\0';
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if (pprotocol == NULL) {
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/*
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* No protocol was explicitly specified, so it
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* could be a local connection over a transport
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* that we won't see.
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*
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* Does the host name refer to the local host?
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* If so, the connection would probably be a
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* local connection.
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*
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* XXX - compare against our host name?
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* _X11TransConnectDisplay() does.
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*/
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if (g_ascii_strcasecmp(phostname, "localhost") == 0 ||
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strcmp(phostname, "127.0.0.1") == 0) {
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g_free(phostname);
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return "";
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}
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/*
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* A host name of "unix" (case-sensitive) also
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* causes a local connection.
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*/
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if (strcmp(phostname, "unix") == 0) {
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g_free(phostname);
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return "";
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}
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/*
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* Does the host name begin with "/"? If so,
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* it's presumed to be the pathname of a
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* UNIX domain socket.
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*/
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if (phostname[0] == '/') {
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g_free(phostname);
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return "";
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}
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}
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g_string_printf(filter_str, "not %s host %s",
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host_ip_af(phostname), phostname);
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g_free(phostname);
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return filter_str->str;
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} else if ((env = getenv("SESSIONNAME")) != NULL) {
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/* Apparently the KB article at
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* http://technet2.microsoft.com/WindowsServer/en/library/6caf87bf-3d70-4801-9485-87e9ec3df0171033.mspx?mfr=true
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* is incorrect. There are _plenty_ of cases where CLIENTNAME
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* and SESSIONNAME are set outside of a Terminal Terver session.
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* It looks like Terminal Server sets SESSIONNAME to RDP-TCP#<number>
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* for "real" sessions.
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*
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* XXX - There's a better way to do this described at
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* http://www.microsoft.com/technet/archive/termsrv/maintain/featusability/tsrvapi.mspx?mfr=true
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*/
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if (g_ascii_strncasecmp(env, "rdp", 3) == 0) {
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g_string_printf(filter_str, "not tcp port 3389");
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return filter_str->str;
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}
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}
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return "";
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}
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