/ui/util.c
C | 352 lines | 172 code | 33 blank | 147 comment | 76 complexity | c68300735883c6c8e373cd1ae75ea3f7 MD5 | raw file
Possible License(s): GPL-2.0, BSD-3-Clause
- /* util.c
- * Utility routines
- *
- * $Id$
- *
- * Wireshark - Network traffic analyzer
- * By Gerald Combs <gerald@wireshark.org>
- * Copyright 1998 Gerald Combs
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
- #include "config.h"
- #include <glib.h>
- #include <stdlib.h>
- #include <string.h>
- #include <stdio.h>
- #include <errno.h>
- #ifdef HAVE_UNISTD_H
- #include <unistd.h>
- #endif
- #ifdef HAVE_WINDOWS_H
- #include <windows.h>
- #endif
- #include <epan/address.h>
- #include <epan/addr_resolv.h>
- #include <epan/strutil.h>
- #include "ui/util.h"
- /*
- * Collect command-line arguments as a string consisting of the arguments,
- * separated by spaces.
- */
- char *
- get_args_as_string(int argc, char **argv, int optindex)
- {
- int len;
- int i;
- char *argstring;
- /*
- * Find out how long the string will be.
- */
- len = 0;
- for (i = optindex; i < argc; i++) {
- len += (int) strlen(argv[i]);
- len++; /* space, or '\0' if this is the last argument */
- }
- /*
- * Allocate the buffer for the string.
- */
- argstring = (char *)g_malloc(len);
- /*
- * Now construct the string.
- */
- argstring[0] = '\0';
- i = optindex;
- for (;;) {
- g_strlcat(argstring, argv[i], len);
- i++;
- if (i == argc)
- break;
- g_strlcat(argstring, " ", len);
- }
- return argstring;
- }
- /* Compute the difference between two seconds/microseconds time stamps. */
- void
- compute_timestamp_diff(gint *diffsec, gint *diffusec,
- guint32 sec1, guint32 usec1, guint32 sec2, guint32 usec2)
- {
- if (sec1 == sec2) {
- /* The seconds part of the first time is the same as the seconds
- part of the second time, so if the microseconds part of the first
- time is less than the microseconds part of the second time, the
- first time is before the second time. The microseconds part of
- the delta should just be the difference between the microseconds
- part of the first time and the microseconds part of the second
- time; don't adjust the seconds part of the delta, as it's OK if
- the microseconds part is negative. */
- *diffsec = sec1 - sec2;
- *diffusec = usec1 - usec2;
- } else if (sec1 <= sec2) {
- /* The seconds part of the first time is less than the seconds part
- of the second time, so the first time is before the second time.
- Both the "seconds" and "microseconds" value of the delta
- should have the same sign, so if the difference between the
- microseconds values would be *positive*, subtract 1,000,000
- from it, and add one to the seconds value. */
- *diffsec = sec1 - sec2;
- if (usec2 >= usec1) {
- *diffusec = usec1 - usec2;
- } else {
- *diffusec = (usec1 - 1000000) - usec2;
- (*diffsec)++;
- }
- } else {
- /* Oh, good, we're not caught in a chronosynclastic infindibulum. */
- *diffsec = sec1 - sec2;
- if (usec2 <= usec1) {
- *diffusec = usec1 - usec2;
- } else {
- *diffusec = (usec1 + 1000000) - usec2;
- (*diffsec)--;
- }
- }
- }
- /* Remove any %<interface_name> from an IP address. */
- static char *sanitize_filter_ip(char *hostname) {
- gchar *end;
- gchar *ret;
- ret = g_strdup(hostname);
- if (!ret)
- return NULL;
- end = strchr(ret, '%');
- if (end)
- *end = '\0';
- return ret;
- }
- /* Try to figure out if we're remotely connected, e.g. via ssh or
- Terminal Server, and create a capture filter that matches aspects of the
- connection. We match the following environment variables:
- SSH_CONNECTION (ssh): <remote IP> <remote port> <local IP> <local port>
- SSH_CLIENT (ssh): <remote IP> <remote port> <local port>
- REMOTEHOST (tcsh, others?): <remote name>
- DISPLAY (x11): [remote name]:<display num>
- SESSIONNAME (terminal server): <remote name>
- */
- const gchar *get_conn_cfilter(void) {
- static GString *filter_str = NULL;
- gchar *env, **tokens;
- char *lastp, *lastc, *p;
- char *pprotocol = NULL;
- char *phostname = NULL;
- size_t hostlen;
- char *remip, *locip;
- if (filter_str == NULL) {
- filter_str = g_string_new("");
- }
- if ((env = getenv("SSH_CONNECTION")) != NULL) {
- tokens = g_strsplit(env, " ", 4);
- if (tokens[3]) {
- remip = sanitize_filter_ip(tokens[0]);
- locip = sanitize_filter_ip(tokens[2]);
- g_string_printf(filter_str, "not (tcp port %s and %s host %s "
- "and tcp port %s and %s host %s)", tokens[1], host_ip_af(remip), remip,
- tokens[3], host_ip_af(locip), locip);
- g_free(remip);
- g_free(locip);
- return filter_str->str;
- }
- } else if ((env = getenv("SSH_CLIENT")) != NULL) {
- tokens = g_strsplit(env, " ", 3);
- remip = sanitize_filter_ip(tokens[2]);
- g_string_printf(filter_str, "not (tcp port %s and %s host %s "
- "and tcp port %s)", tokens[1], host_ip_af(remip), tokens[0], remip);
- g_free(remip);
- return filter_str->str;
- } else if ((env = getenv("REMOTEHOST")) != NULL) {
- /* FreeBSD 7.0 sets REMOTEHOST to an empty string */
- if (g_ascii_strcasecmp(env, "localhost") == 0 ||
- strcmp(env, "127.0.0.1") == 0 ||
- strcmp(env, "") == 0) {
- return "";
- }
- remip = sanitize_filter_ip(env);
- g_string_printf(filter_str, "not %s host %s", host_ip_af(remip), remip);
- g_free(remip);
- return filter_str->str;
- } else if ((env = getenv("DISPLAY")) != NULL) {
- /*
- * This mirrors what _X11TransConnectDisplay() does.
- * Note that, on some systems, the hostname can
- * begin with "/", which means that it's a pathname
- * of a UNIX domain socket to connect to.
- *
- * The comments mirror those in _X11TransConnectDisplay(),
- * too. :-)
- *
- * Display names may be of the following format:
- *
- * [protoco./] [hostname] : [:] displaynumber [.screennumber]
- *
- * A string with exactly two colons separating hostname
- * from the display indicates a DECnet style name. Colons
- * in the hostname may occur if an IPv6 numeric address
- * is used as the hostname. An IPv6 numeric address may
- * also end in a double colon, so three colons in a row
- * indicates an IPv6 address ending in :: followed by
- * :display. To make it easier for people to read, an
- * IPv6 numeric address hostname may be surrounded by []
- * in a similar fashion to the IPv6 numeric address URL
- * syntax defined by IETF RFC 2732.
- *
- * If no hostname and no protocol is specified, the string
- * is interpreted as the most efficient local connection
- * to a server on the same machine. This is usually:
- *
- * o shared memory
- * o local stream
- * o UNIX domain socket
- * o TCP to local host.
- */
- p = env;
- /*
- * Step 0, find the protocol. This is delimited by
- * the optional slash ('/').
- */
- for (lastp = p; *p != '\0' && *p != ':' && *p != '/'; p++)
- ;
- if (*p == '\0')
- return ""; /* must have a colon */
- if (p != lastp && *p != ':') { /* protocol given? */
- /* Yes */
- pprotocol = p;
- /* Is it TCP? */
- if (p - lastp != 3 || g_ascii_strncasecmp(lastp, "tcp", 3) != 0)
- return ""; /* not TCP */
- p++; /* skip the '/' */
- } else
- p = env; /* reset the pointer in
- case no protocol was given */
- /*
- * Step 1, find the hostname. This is delimited either by
- * one colon, or two colons in the case of DECnet (DECnet
- * Phase V allows a single colon in the hostname). (See
- * note above regarding IPv6 numeric addresses with
- * triple colons or [] brackets.)
- */
- lastp = p;
- lastc = NULL;
- for (; *p != '\0'; p++)
- if (*p == ':')
- lastc = p;
- if (lastc == NULL)
- return ""; /* must have a colon */
- if ((lastp != lastc) && (*(lastc - 1) == ':')
- && (((lastc - 1) == lastp) || (*(lastc - 2) != ':'))) {
- /* DECnet display specified */
- return "";
- } else
- hostlen = lastc - lastp;
- if (hostlen == 0)
- return ""; /* no hostname supplied */
- phostname = (char *)g_malloc(hostlen + 1);
- memcpy(phostname, lastp, hostlen);
- phostname[hostlen] = '\0';
- if (pprotocol == NULL) {
- /*
- * No protocol was explicitly specified, so it
- * could be a local connection over a transport
- * that we won't see.
- *
- * Does the host name refer to the local host?
- * If so, the connection would probably be a
- * local connection.
- *
- * XXX - compare against our host name?
- * _X11TransConnectDisplay() does.
- */
- if (g_ascii_strcasecmp(phostname, "localhost") == 0 ||
- strcmp(phostname, "127.0.0.1") == 0) {
- g_free(phostname);
- return "";
- }
- /*
- * A host name of "unix" (case-sensitive) also
- * causes a local connection.
- */
- if (strcmp(phostname, "unix") == 0) {
- g_free(phostname);
- return "";
- }
- /*
- * Does the host name begin with "/"? If so,
- * it's presumed to be the pathname of a
- * UNIX domain socket.
- */
- if (phostname[0] == '/') {
- g_free(phostname);
- return "";
- }
- }
- g_string_printf(filter_str, "not %s host %s",
- host_ip_af(phostname), phostname);
- g_free(phostname);
- return filter_str->str;
- #ifdef _WIN32
- } else if (GetSystemMetrics(SM_REMOTESESSION)) {
- /* We have a remote session: http://msdn.microsoft.com/en-us/library/aa380798%28VS.85%29.aspx */
- g_string_printf(filter_str, "not tcp port 3389");
- return filter_str->str;
- #endif /* _WIN32 */
- }
- return "";
- }
- /*
- * Editor modelines
- *
- * Local Variables:
- * c-basic-offset: 4
- * tab-width: 8
- * indent-tabs-mode: nil
- * End:
- *
- * ex: set shiftwidth=4 tabstop=8 expandtab:
- * :indentSize=4:tabSize=8:noTabs=true:
- */