forked from osmocom/wireshark
![Jörg Mayer](/assets/img/avatar_default.png)
Fix some memleaks and overflows. I haven't committed the changes that are not bug fixes. svn path=/trunk/; revision=19777
637 lines
18 KiB
C
637 lines
18 KiB
C
/* dumpcap.c
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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 <stdlib.h> /* for exit() */
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#include <glib.h>
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#include <string.h>
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#include <ctype.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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#ifdef NEED_GETOPT_H
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#include "getopt.h"
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#endif
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#include "ringbuffer.h"
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#include "clopts_common.h"
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#include "cmdarg_err.h"
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#include "version_info.h"
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#include <pcap.h>
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#include "capture-pcap-util.h"
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#ifdef _WIN32
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#include "capture-wpcap.h"
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#endif
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#include "sync_pipe.h"
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#include "capture.h"
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#include "capture_loop.h"
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#include "capture_sync.h"
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#include "simple_dialog.h"
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#include "util.h"
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#include "log.h"
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#include "file_util.h"
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/*#define DEBUG_DUMPCAP*/
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gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
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static void
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console_log_handler(const char *log_domain, GLogLevelFlags log_level,
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const char *message, gpointer user_data _U_);
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/* capture related options */
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capture_options global_capture_opts;
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capture_options *capture_opts = &global_capture_opts;
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#if __GNUC__ >= 2
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void exit_main(int err) __attribute__ ((noreturn));
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#else
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void exit_main(int err);
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#endif
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static void
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print_usage(gboolean print_ver) {
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FILE *output;
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if (print_ver) {
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output = stdout;
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fprintf(output,
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"Dumpcap " VERSION "%s\n"
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"Capture network packets and dump them into a libpcap file.\n"
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"See http://www.wireshark.org for more information.\n",
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svnversion);
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} else {
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output = stderr;
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}
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fprintf(output, "\nUsage: dumpcap [options] ...\n");
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fprintf(output, "\n");
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fprintf(output, "Capture interface:\n");
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fprintf(output, " -i <interface> name or idx of interface (def: first none loopback)\n");
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fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
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fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
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fprintf(output, " -p don't capture in promiscuous mode\n");
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#ifdef _WIN32
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fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
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#endif
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fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
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fprintf(output, " -D print list of interfaces and exit\n");
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fprintf(output, " -L print list of link-layer types of iface and exit\n");
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fprintf(output, "\n");
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fprintf(output, "Stop conditions:\n");
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fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
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fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
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fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
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fprintf(output, " files:NUM - stop after NUM files\n");
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/*fprintf(output, "\n");*/
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fprintf(output, "Output (files):\n");
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fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
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fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
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fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
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fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
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/*fprintf(output, "\n");*/
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fprintf(output, "Miscellaneous:\n");
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fprintf(output, " -v print version information and exit\n");
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fprintf(output, " -h display this help and exit\n");
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fprintf(output, "\n");
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fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcap\n");
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fprintf(output, "\"Capture network packets from interface eth0 until 60s passed into output.pcap\"\n");
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fprintf(output, "\n");
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fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
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}
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static void
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show_version(GString *comp_info_str, GString *runtime_info_str)
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{
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printf(
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"Dumpcap " VERSION "%s\n"
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"\n"
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"%s\n"
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"%s\n"
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"%s\n"
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"See http://www.wireshark.org for more information.\n",
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svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
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}
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/*
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* Report an error in command-line arguments.
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*/
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void
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cmdarg_err(const char *fmt, ...)
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{
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va_list ap;
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if(capture_child) {
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/* XXX - convert to g_log */
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} else {
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va_start(ap, fmt);
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fprintf(stderr, "dumpcap: ");
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\n");
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va_end(ap);
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}
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}
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/*
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* Report additional information for an error in command-line arguments.
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*/
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void
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cmdarg_err_cont(const char *fmt, ...)
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{
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va_list ap;
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if(capture_child) {
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/* XXX - convert to g_log */
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} else {
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\n");
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va_end(ap);
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}
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}
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#ifdef _WIN32
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BOOL WINAPI ConsoleCtrlHandlerRoutine(DWORD dwCtrlType)
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{
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
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"Console: Control signal");
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
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"Console: Control signal, CtrlType: %u", dwCtrlType);
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/* Keep capture running if we're a service and a user logs off */
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if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
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capture_loop_stop();
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return TRUE;
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} else {
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return FALSE;
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}
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}
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#endif
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void exit_main(int status)
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{
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#ifdef _WIN32
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/* Shutdown windows sockets */
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WSACleanup();
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/* can be helpful for debugging */
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#ifdef DEBUG_DUMPCAP
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printf("Press any key\n");
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_getch();
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#endif
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#endif /* _WIN32 */
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exit(status);
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}
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/* And now our feature presentation... [ fade to music ] */
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int
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main(int argc, char *argv[])
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{
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int opt;
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extern char *optarg;
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gboolean arg_error = FALSE;
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#ifdef _WIN32
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WSADATA wsaData;
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#endif /* _WIN32 */
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gboolean start_capture = TRUE;
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gboolean stats_known;
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struct pcap_stat stats;
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GLogLevelFlags log_flags;
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gboolean list_link_layer_types = FALSE;
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int status;
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#define OPTSTRING_INIT "a:b:c:Df:hi:Lps:vw:y:Z"
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#ifdef _WIN32
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#define OPTSTRING_WIN32 "B:"
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#else
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#define OPTSTRING_WIN32 ""
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#endif /* _WIN32 */
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char optstring[sizeof(OPTSTRING_INIT) + sizeof(OPTSTRING_WIN32) - 1] =
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OPTSTRING_INIT OPTSTRING_WIN32;
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#ifdef _WIN32
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/* Load wpcap if possible. Do this before collecting the run-time version information */
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load_wpcap();
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/* ... and also load the packet.dll from wpcap */
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/* XXX - currently not required, may change later. */
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/*wpcap_packet_load();*/
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/* Start windows sockets */
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WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
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/* Set handler for Ctrl+C key */
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SetConsoleCtrlHandler(&ConsoleCtrlHandlerRoutine, TRUE);
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#endif /* _WIN32 */
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/* the default_log_handler will use stdout, which makes trouble in */
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/* capture child mode, as it uses stdout for it's sync_pipe */
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/* so do the filtering in the console_log_handler and not here */
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log_flags =
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G_LOG_LEVEL_ERROR|
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G_LOG_LEVEL_CRITICAL|
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G_LOG_LEVEL_WARNING|
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G_LOG_LEVEL_MESSAGE|
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G_LOG_LEVEL_INFO|
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G_LOG_LEVEL_DEBUG|
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G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
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g_log_set_handler(NULL,
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log_flags,
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console_log_handler, NULL /* user_data */);
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g_log_set_handler(LOG_DOMAIN_MAIN,
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log_flags,
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console_log_handler, NULL /* user_data */);
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g_log_set_handler(LOG_DOMAIN_CAPTURE,
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log_flags,
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console_log_handler, NULL /* user_data */);
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g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
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log_flags,
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console_log_handler, NULL /* user_data */);
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/* Set the initial values in the capture_opts. This might be overwritten
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by the command line parameters. */
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capture_opts_init(capture_opts, NULL);
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/* Default to capturing the entire packet. */
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capture_opts->snaplen = WTAP_MAX_PACKET_SIZE;
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/* We always save to a file - if no file was specified, we save to a
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temporary file. */
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capture_opts->saving_to_file = TRUE;
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capture_opts->has_ring_num_files = TRUE;
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/* Now get our args */
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while ((opt = getopt(argc, argv, optstring)) != -1) {
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switch (opt) {
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case 'h': /* Print help and exit */
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print_usage(TRUE);
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exit_main(0);
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break;
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case 'v': /* Show version and exit */
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{
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GString *comp_info_str;
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GString *runtime_info_str;
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/* Assemble the compile-time version information string */
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comp_info_str = g_string_new("Compiled with ");
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get_compiled_version_info(comp_info_str, NULL);
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/* Assemble the run-time version information string */
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runtime_info_str = g_string_new("Running ");
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get_runtime_version_info(runtime_info_str, NULL);
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show_version(comp_info_str, runtime_info_str);
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g_string_free(comp_info_str, TRUE);
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g_string_free(runtime_info_str, TRUE);
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exit_main(0);
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break;
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}
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/*** capture option specific ***/
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case 'a': /* autostop criteria */
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case 'b': /* Ringbuffer option */
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case 'c': /* Capture x packets */
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case 'f': /* capture filter */
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case 'i': /* Use interface x */
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case 'p': /* Don't capture in promiscuous mode */
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case 's': /* Set the snapshot (capture) length */
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case 'w': /* Write to capture file x */
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case 'y': /* Set the pcap data link type */
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#ifdef _WIN32
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case 'B': /* Buffer size */
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#endif /* _WIN32 */
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status = capture_opts_add_opt(capture_opts, opt, optarg, &start_capture);
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if(status != 0) {
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exit_main(status);
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}
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break;
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/*** hidden option: Wireshark child mode (using binary output messages) ***/
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case 'Z':
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capture_child = TRUE;
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#ifdef _WIN32
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/* set output pipe to binary mode, to avoid ugly text conversions */
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_setmode(1, O_BINARY);
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#endif
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break;
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/*** all non capture option specific ***/
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case 'D': /* Print a list of capture devices and exit */
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status = capture_opts_list_interfaces();
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exit_main(status);
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break;
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case 'L': /* Print list of link-layer types and exit */
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list_link_layer_types = TRUE;
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break;
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default:
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case '?': /* Bad flag - print usage message */
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cmdarg_err("Invalid Option: %s", argv[optind-1]);
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arg_error = TRUE;
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break;
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}
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}
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argc -= optind;
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argv += optind;
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if (argc >= 1) {
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/* user specified file name as regular command-line argument */
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/* XXX - use it as the capture file name (or something else)? */
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argc--;
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argv++;
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}
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if (argc != 0) {
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/*
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* Extra command line arguments were specified; complain.
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* XXX - interpret as capture filter, as tcpdump and tshark do?
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*/
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cmdarg_err("Invalid argument: %s", argv[0]);
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arg_error = TRUE;
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}
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if (arg_error) {
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print_usage(FALSE);
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exit_main(1);
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}
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if (list_link_layer_types) {
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/* We're supposed to list the link-layer types for an interface;
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did the user also specify a capture file to be read? */
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/* No - did they specify a ring buffer option? */
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if (capture_opts->multi_files_on) {
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cmdarg_err("Ring buffer requested, but a capture isn't being done.");
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exit_main(1);
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}
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} else {
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/* No - was the ring buffer option specified and, if so, does it make
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sense? */
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if (capture_opts->multi_files_on) {
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/* Ring buffer works only under certain conditions:
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a) ring buffer does not work with temporary files;
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b) it makes no sense to enable the ring buffer if the maximum
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file size is set to "infinite". */
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if (capture_opts->save_file == NULL) {
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cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
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capture_opts->multi_files_on = FALSE;
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}
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if (!capture_opts->has_autostop_filesize && !capture_opts->has_file_duration) {
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cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
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/* XXX - this must be redesigned as the conditions changed */
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/* capture_opts->multi_files_on = FALSE;*/
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}
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}
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}
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if (capture_opts_trim_iface(capture_opts, NULL) == FALSE) {
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cmdarg_err("No capture interfaces available (maybe lack of privileges?).");
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exit_main(1);
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}
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/* Let the user know what interface was chosen. */
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/* get_interface_descriptive_name() is not available! */
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s\n", capture_opts->iface);
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if (list_link_layer_types) {
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status = capture_opts_list_link_layer_types(capture_opts);
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exit_main(status);
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}
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capture_opts_trim_snaplen(capture_opts, MIN_PACKET_SIZE);
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capture_opts_trim_ring_num_files(capture_opts);
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/* Now start the capture. */
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if(capture_loop_start(capture_opts, &stats_known, &stats) == TRUE) {
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/* capture ok */
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exit_main(0);
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} else {
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/* capture failed */
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exit_main(1);
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}
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}
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static void
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console_log_handler(const char *log_domain, GLogLevelFlags log_level,
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const char *message, gpointer user_data _U_)
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{
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time_t curr;
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struct tm *today;
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const char *level;
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/* ignore log message, if log_level isn't interesting */
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if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
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#ifndef DEBUG_DUMPCAP
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return;
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#endif
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}
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/* create a "timestamp" */
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time(&curr);
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today = localtime(&curr);
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switch(log_level & G_LOG_LEVEL_MASK) {
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case G_LOG_LEVEL_ERROR:
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level = "Err ";
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break;
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case G_LOG_LEVEL_CRITICAL:
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level = "Crit";
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break;
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case G_LOG_LEVEL_WARNING:
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level = "Warn";
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break;
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case G_LOG_LEVEL_MESSAGE:
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level = "Msg ";
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break;
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case G_LOG_LEVEL_INFO:
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level = "Info";
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break;
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case G_LOG_LEVEL_DEBUG:
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level = "Dbg ";
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break;
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default:
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fprintf(stderr, "unknown log_level %u\n", log_level);
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level = NULL;
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g_assert_not_reached();
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}
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/* don't use printf (stdout), in child mode we're using stdout for the sync_pipe */
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if(log_level & G_LOG_LEVEL_MESSAGE) {
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/* normal user messages without additional infos */
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fprintf(stderr, "%s\n", message);
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fflush(stderr);
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} else {
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/* info/debug messages with additional infos */
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fprintf(stderr, "%02u:%02u:%02u %8s %s %s\n",
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today->tm_hour, today->tm_min, today->tm_sec,
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log_domain != NULL ? log_domain : "",
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level, message);
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fflush(stderr);
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}
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}
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/****************************************************************************************************************/
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/* indication report routines */
|
|
|
|
|
|
void
|
|
report_packet_count(int packet_count)
|
|
{
|
|
char tmp[SP_DECISIZE+1+1];
|
|
static int count = 0;
|
|
|
|
|
|
if(capture_child) {
|
|
g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
|
|
pipe_write_block(1, SP_PACKET_COUNT, tmp);
|
|
} else {
|
|
count += packet_count;
|
|
fprintf(stderr, "\rPackets: %u ", count);
|
|
/* stderr could be line buffered */
|
|
fflush(stderr);
|
|
}
|
|
}
|
|
|
|
void
|
|
report_new_capture_file(const char *filename)
|
|
{
|
|
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
|
|
|
|
if(capture_child) {
|
|
pipe_write_block(1, SP_FILE, filename);
|
|
}
|
|
}
|
|
|
|
void
|
|
report_cfilter_error(const char *cfilter _U_, const char *errmsg)
|
|
{
|
|
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
|
|
|
|
if (capture_child) {
|
|
pipe_write_block(1, SP_BAD_FILTER, errmsg);
|
|
}
|
|
}
|
|
|
|
void
|
|
report_capture_error(const char *error_msg, const char *secondary_error_msg)
|
|
{
|
|
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"Primary Error: %s", error_msg);
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"Secondary Error: %s", secondary_error_msg);
|
|
|
|
if(capture_child) {
|
|
sync_pipe_errmsg_to_parent(error_msg, secondary_error_msg);
|
|
}
|
|
}
|
|
|
|
void
|
|
report_packet_drops(int drops)
|
|
{
|
|
char tmp[SP_DECISIZE+1+1];
|
|
|
|
|
|
g_snprintf(tmp, sizeof(tmp), "%d", drops);
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets dropped: %s", tmp);
|
|
|
|
if(capture_child) {
|
|
pipe_write_block(1, SP_DROPS, tmp);
|
|
}
|
|
}
|
|
|
|
|
|
/****************************************************************************************************************/
|
|
/* signal_pipe handling */
|
|
|
|
|
|
#ifdef _WIN32
|
|
gboolean
|
|
signal_pipe_check_running(void)
|
|
{
|
|
/* any news from our parent (stdin)? -> just stop the capture */
|
|
HANDLE handle;
|
|
DWORD avail = 0;
|
|
gboolean result;
|
|
|
|
|
|
/* if we are running standalone, no check required */
|
|
if(!capture_child) {
|
|
return TRUE;
|
|
}
|
|
|
|
handle = (HANDLE) GetStdHandle(STD_INPUT_HANDLE);
|
|
result = PeekNamedPipe(handle, NULL, 0, NULL, &avail, NULL);
|
|
|
|
if(!result || avail > 0) {
|
|
/* peek failed or some bytes really available */
|
|
/* (if not piping from stdin this would fail) */
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
|
|
"Signal pipe: Stop capture");
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"Signal pipe: handle: %x result: %u avail: %u", handle, result, avail);
|
|
return FALSE;
|
|
} else {
|
|
/* pipe ok and no bytes available */
|
|
return TRUE;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
/****************************************************************************************************************/
|
|
/* Stub functions */
|
|
|
|
|
|
const char *netsnmp_get_version(void) { return ""; }
|
|
|