forked from osmocom/wireshark
755 lines
21 KiB
C
755 lines
21 KiB
C
/* dumpcap.c
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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 <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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#ifdef _WIN32 /* Needed for console I/O */
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#include <conio.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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/*#include "capture_wpcap_packet.h"*/
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#endif
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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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/* Win32 console handling */
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#ifdef _WIN32
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static gboolean has_console = TRUE; /* TRUE if app has console */
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static void create_console(void);
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static void destroy_console(void);
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#endif
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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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static void
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print_usage(gboolean print_ver) {
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FILE *output;
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#ifdef _WIN32
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create_console();
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#endif
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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.ethereal.com 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 [option] ...\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 format\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, "\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, " -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, "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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#ifdef _WIN32
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create_console();
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#endif
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printf(
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"Dumpcap " VERSION "%s\n"
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"\n"
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"(C) 1998-2005 Gerald Combs <gerald@ethereal.com>\n"
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"See http://www.ethereal.com for more information.\n"
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"\n"
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"%s\n"
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"\n"
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"%s\n",
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svnversion, 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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* Creates a console on Windows.
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* XXX - pop this up in a window of some sort on UNIX+X11 if the controlling
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* terminal isn't the standard error?
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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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#ifdef _WIN32
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create_console();
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#endif
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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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* Report additional information for an error in command-line arguments.
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* Creates a console on Windows.
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* XXX - pop this up in a window of some sort on UNIX+X11 if the controlling
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* terminal isn't the standard error?
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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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#ifdef _WIN32
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create_console();
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#endif
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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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#ifdef _WIN32
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BOOL WINAPI ConsoleCtrlHandlerRoutine(DWORD dwCtrlType)
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{
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/*printf("Event: %u", dwCtrlType);*/
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capture_loop_stop();
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return TRUE;
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}
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#endif
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void
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exit_main(int err) {
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#ifdef _WIN32
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/* Shutdown windows sockets */
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WSACleanup();
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destroy_console();
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#endif
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exit(err);
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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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GString *comp_info_str;
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GString *runtime_info_str;
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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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#define OPTSTRING_INIT "a:b:c:Df:hi:Lps:vw:y:"
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#ifdef _WIN32
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#define OPTSTRING_WIN32 "B:Z:"
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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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/* Assemble the compile-time version information string */
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comp_info_str = g_string_new("Compiled ");
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g_string_append(comp_info_str, "with ");
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get_compiled_version_info(comp_info_str);
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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);
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/* Arrange that if we have no console window, and a GLib message logging
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routine is called to log a message, we pop up a console window.
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We do that by inserting our own handler for all messages logged
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to the default domain; that handler pops up a console if necessary,
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and then calls the default handler. */
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/* We might want to have component specific log levels later ... */
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/* the default_log_handler will use stdout, which makes trouble with the */
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/* capture child, 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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capture_opts->snaplen = MIN_PACKET_SIZE;
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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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show_version(comp_info_str, runtime_info_str);
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exit_main(0);
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break;
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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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/* Hidden option supporting Sync mode */
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case 'Z': /* Write to pipe FD x */
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#endif /* _WIN32 */
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capture_opts_add_opt(capture_opts, opt, optarg, &start_capture);
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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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capture_opts_list_interfaces();
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exit(0);
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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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*/
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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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capture_opts_trim_iface(capture_opts, NULL);
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/* Let the user know what interface was chosen. */
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/* descr = get_interface_descriptive_name(capture_opts.iface);
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fprintf(stderr, "Capturing on %s\n", descr);
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g_free(descr);*/
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fprintf(stderr, "Capturing on %s\n", capture_opts->iface);
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if (list_link_layer_types) {
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capture_opts_list_link_layer_types(capture_opts);
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exit_main(0);
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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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/* XXX - hand the stats to the parent process */
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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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#ifdef _WIN32
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/* We build this as a GUI subsystem application on Win32, so
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"WinMain()", not "main()", gets called.
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Hack shamelessly stolen from the Win32 port of the GIMP. */
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#ifdef __GNUC__
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#define _stdcall __attribute__((stdcall))
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#endif
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int _stdcall
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WinMain (struct HINSTANCE__ *hInstance,
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struct HINSTANCE__ *hPrevInstance,
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char *lpszCmdLine,
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int nCmdShow)
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{
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has_console = FALSE;
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return main (__argc, __argv);
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}
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/*
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* If this application has no console window to which its standard output
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* would go, create one.
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*/
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void
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create_console(void)
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{
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if (!has_console) {
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/* We have no console to which to print the version string, so
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create one and make it the standard input, output, and error. */
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if (!AllocConsole())
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return; /* couldn't create console */
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eth_freopen("CONIN$", "r", stdin);
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eth_freopen("CONOUT$", "w", stdout);
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eth_freopen("CONOUT$", "w", stderr);
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/* Well, we have a console now. */
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has_console = TRUE;
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/* Now register "destroy_console()" as a routine to be called just
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before the application exits, so that we can destroy the console
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after the user has typed a key (so that the console doesn't just
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disappear out from under them, giving the user no chance to see
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the message(s) we put in there). */
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atexit(destroy_console);
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SetConsoleTitle("Dumpcap Console");
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}
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}
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static void
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destroy_console(void)
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{
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if (has_console) {
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/* XXX - doesn't make sense while we're linked as a console application */
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/* printf("\n\nPress any key to exit\n");
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_getch();*/
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FreeConsole();
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}
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}
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#endif /* _WIN32 */
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/* This routine should not be necessary, at least as I read the GLib
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source code, as it looks as if GLib is, on Win32, *supposed* to
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create a console window into which to display its output.
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That doesn't happen, however. I suspect there's something completely
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broken about that code in GLib-for-Win32, and that it may be related
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to the breakage that forces us to just call "printf()" on the message
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rather than passing the message on to "g_log_default_handler()"
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(which is the routine that does the aforementioned non-functional
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console window creation). */
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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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{
|
|
time_t curr;
|
|
struct tm *today;
|
|
const char *level;
|
|
|
|
|
|
/* ignore log message, if log_level isn't interesting */
|
|
if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO) /*prefs.console_log_level*/)) {
|
|
return;
|
|
}
|
|
|
|
/* create a "timestamp" */
|
|
time(&curr);
|
|
today = localtime(&curr);
|
|
|
|
#ifdef _WIN32
|
|
/* if (prefs.gui_console_open != console_open_never) {*/
|
|
create_console();
|
|
/* }*/
|
|
if (has_console) {
|
|
/* For some unknown reason, the above doesn't appear to actually cause
|
|
anything to be sent to the standard output, so we'll just splat the
|
|
message out directly, just to make sure it gets out. */
|
|
#endif
|
|
switch(log_level & G_LOG_LEVEL_MASK) {
|
|
case G_LOG_LEVEL_ERROR:
|
|
level = "Err ";
|
|
break;
|
|
case G_LOG_LEVEL_CRITICAL:
|
|
level = "Crit";
|
|
break;
|
|
case G_LOG_LEVEL_WARNING:
|
|
level = "Warn";
|
|
break;
|
|
case G_LOG_LEVEL_MESSAGE:
|
|
level = "Msg ";
|
|
break;
|
|
case G_LOG_LEVEL_INFO:
|
|
level = "Info";
|
|
break;
|
|
case G_LOG_LEVEL_DEBUG:
|
|
level = "Dbg ";
|
|
break;
|
|
default:
|
|
fprintf(stderr, "unknown log_level %u\n", log_level);
|
|
level = NULL;
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
/* don't use printf (stdout), as the capture child uses stdout for it's sync_pipe */
|
|
fprintf(stderr, "%02u:%02u:%02u %8s %s %s\n",
|
|
today->tm_hour, today->tm_min, today->tm_sec,
|
|
log_domain != NULL ? log_domain : "",
|
|
level, message);
|
|
#ifdef _WIN32
|
|
} else {
|
|
g_log_default_handler(log_domain, log_level, message, user_data);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/****************************************************************************************************************/
|
|
/* sync_pipe "dummies" */
|
|
|
|
/*
|
|
* Maximum length of sync pipe message data. Must be < 2^24, as the
|
|
* message length is 3 bytes.
|
|
* XXX - this must be large enough to handle a Really Big Filter
|
|
* Expression, as the error message for an incorrect filter expression
|
|
* is a bit larger than the filter expression.
|
|
*/
|
|
#define SP_MAX_MSG_LEN 4096
|
|
|
|
|
|
/* write a message to the recipient pipe in the standard format
|
|
(3 digit message length (excluding length and indicator field),
|
|
1 byte message indicator and the rest is the message) */
|
|
static void
|
|
pipe_write_block(int pipe, char indicator, int len, const char *msg)
|
|
{
|
|
guchar header[3+1]; /* indicator + 3-byte len */
|
|
int ret;
|
|
|
|
/*g_warning("write %d enter", pipe);*/
|
|
|
|
/* XXX - find a suitable way to switch between pipe and console output */
|
|
return;
|
|
|
|
g_assert(indicator < '0' || indicator > '9');
|
|
g_assert(len <= SP_MAX_MSG_LEN);
|
|
|
|
/* write header (indicator + 3-byte len) */
|
|
header[0] = indicator;
|
|
header[1] = (len >> 16) & 0xFF;
|
|
header[2] = (len >> 8) & 0xFF;
|
|
header[3] = (len >> 0) & 0xFF;
|
|
|
|
ret = write(pipe, header, sizeof header);
|
|
if(ret == -1) {
|
|
return;
|
|
}
|
|
|
|
/* write value (if we have one) */
|
|
if(len) {
|
|
/*g_warning("write %d indicator: %c value len: %u msg: %s", pipe, indicator, len, msg);*/
|
|
ret = write(pipe, msg, len);
|
|
if(ret == -1) {
|
|
return;
|
|
}
|
|
} else {
|
|
/*g_warning("write %d indicator: %c no value", pipe, indicator);*/
|
|
}
|
|
|
|
/*g_warning("write %d leave", pipe);*/
|
|
}
|
|
|
|
|
|
int count = 0;
|
|
|
|
void
|
|
sync_pipe_packet_count_to_parent(int packet_count)
|
|
{
|
|
char tmp[SP_DECISIZE+1+1];
|
|
|
|
|
|
count += packet_count;
|
|
fprintf(stderr, "\r%u", count);
|
|
/* stderr could be line buffered */
|
|
fflush(stderr);
|
|
|
|
|
|
g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
|
|
|
|
/*g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "sync_pipe_packet_count_to_parent: %s", tmp);*/
|
|
|
|
pipe_write_block(1, SP_PACKET_COUNT, strlen(tmp)+1, tmp);
|
|
}
|
|
|
|
void
|
|
sync_pipe_filename_to_parent(const char *filename)
|
|
{
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "File: %s", filename);
|
|
|
|
pipe_write_block(1, SP_FILE, strlen(filename)+1, filename);
|
|
}
|
|
|
|
void
|
|
sync_pipe_errmsg_to_parent(const char *errmsg)
|
|
{
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "sync_pipe_errmsg_to_parent: %s", errmsg);
|
|
|
|
pipe_write_block(1, SP_ERROR_MSG, strlen(errmsg)+1, errmsg);
|
|
}
|
|
|
|
void
|
|
sync_pipe_drops_to_parent(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, "sync_pipe_drops_to_parent: %s", tmp);
|
|
|
|
pipe_write_block(1, SP_DROPS, strlen(tmp)+1, tmp);
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************************************************/
|
|
/* simple_dialog "dummies" */
|
|
|
|
|
|
char *simple_dialog_primary_start(void)
|
|
{
|
|
return "";
|
|
}
|
|
|
|
char *simple_dialog_primary_end(void)
|
|
{
|
|
return "";
|
|
}
|
|
|
|
char *
|
|
simple_dialog_format_message(const char *msg)
|
|
{
|
|
char *str;
|
|
|
|
if (msg) {
|
|
#if GTK_MAJOR_VERSION < 2
|
|
str = g_strdup(msg);
|
|
#else
|
|
str = xml_escape(msg);
|
|
#endif
|
|
} else {
|
|
str = NULL;
|
|
}
|
|
return str;
|
|
}
|
|
|
|
/****************************************************************************************************************/
|
|
/* link "dummies" */
|
|
|
|
|
|
const char *netsnmp_get_version(void) { return ""; }
|
|
|
|
gboolean dfilter_compile(const gchar *text, dfilter_t **dfp) { return NULL; }
|
|
|
|
void dfilter_free(dfilter_t *df) {}
|
|
|
|
|
|
/*
|
|
* Find out whether a hostname resolves to an ip or ipv6 address
|
|
* Return "ip6" if it is IPv6, "ip" otherwise (including the case
|
|
* that we don't know)
|
|
*/
|
|
const char* host_ip_af(const char *host
|
|
#ifndef HAVE_GETHOSTBYNAME2
|
|
_U_
|
|
#endif
|
|
)
|
|
{
|
|
#ifdef HAVE_GETHOSTBYNAME2
|
|
struct hostent *h;
|
|
return (h = gethostbyname2(host, AF_INET6)) && h->h_addrtype == AF_INET6 ? "ip6" : "ip";
|
|
#else
|
|
return "ip";
|
|
#endif
|
|
}
|
|
|