forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
bugs 7825-7827 (https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7825) svn path=/trunk/; revision=46928
295 lines
7.7 KiB
C
295 lines
7.7 KiB
C
/*
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* trigcap
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* a simple triggered libpcap-based capture agent
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*
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* $Id$
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*
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* (c) 2007, Luis E. Garcia Ontanon <luis@ontanon.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <signal.h>
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#include <errno.h>
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#include <getopt.h>
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#include <pcap.h>
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static int dumping;
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static volatile int keep_going;
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static pcap_t* listener;
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static struct bpf_program stop_filter;
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static int captured = 0;
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static int debug_level = 0;
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static void panic(int err, const char* fmt, ...) {
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va_list ap;
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va_start(ap,fmt);
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vfprintf(stderr,fmt,ap);
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va_end(ap);
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exit(err);
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}
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static void dprintf(int lev, const char* fmt, ...) {
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va_list ap;
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if (lev <= debug_level) {
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va_start(ap,fmt);
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vfprintf(stderr,fmt,ap);
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va_end(ap);
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fflush(stderr);
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}
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}
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static void usage(int err) {
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const char* usage_str = "usage:\n"
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"trigcap -w outfile -b begin -e end [-f capture] [-i iface] [-s snaplen] [-p] [-q] [-d [-d [-d [-d]]]]\n"
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" -w output file\n"
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" -b filter to start capturing\n"
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" -e filter to stop capturing\n"
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" -f capture filter\n"
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" -p promiscuous mode\n"
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" -s snapshot length\n"
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" -q quiet\n"
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" -d increase debug level\n"
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" -h prints this message\n"
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;
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panic(err,usage_str);
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}
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static void listener_handler(u_char* u, const struct pcap_pkthdr * ph, const u_char* buf) {
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char errbuf[PCAP_ERRBUF_SIZE];
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dprintf(2,"listener handler invoked dumping=%d\n",dumping);
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if (dumping) {
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dprintf(2,"last round\n");
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keep_going = 0;
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} else {
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if (pcap_setfilter(listener, &stop_filter) < 0) {
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panic(23,"could not apply stop filter to listener: %s\n",pcap_geterr(listener));
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}
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dprintf(2,"apply stop filter to listener\n");
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if (pcap_setnonblock(listener, 1, errbuf) < 0) {
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panic(24,"could not set listener in non blocking mode: %s\n",errbuf);
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}
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dprintf(2,"listener -> non_blocking\n");
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dumping = 1;
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}
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}
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static void capture_handler(u_char* dumper, const struct pcap_pkthdr * ph, const u_char* buf) {
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dprintf(4,"capture handler invoked dumping=%d\n",dumping);
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if (dumping) {
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captured++;
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pcap_dump(dumper, ph, buf);
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}
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}
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static void sig_int(int sig) {
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keep_going = 0;
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}
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int main(int argc, char** argv) {
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char errbuf[PCAP_ERRBUF_SIZE];
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char* interface = NULL;
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char* outfile = NULL;
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guint snaplen = 65536;
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char* start_filter_str = NULL;
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char* stop_filter_str = NULL;
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char* capture_filter_str = NULL;
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int promisc = 0;
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int quiet = 0;
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struct bpf_program start_filter;
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struct bpf_program capture_filter;
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pcap_t* capturer = NULL;
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pcap_dumper_t* dumper = NULL;
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int opt;
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while ((opt = getopt(argc, argv, "i:w:s:b:e:f:phdq")) != -1) {
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switch (opt) {
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case 'i':
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if (interface) panic(1,"interface already given");
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interface = g_strdup(optarg);
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break;
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case 'w':
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if (outfile) panic(3,"output file already given");
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outfile = g_strdup(optarg);
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break;
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case 's':
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snaplen = strtoul(optarg,NULL,10);
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if ( snaplen == 0 )
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panic(4,"invalid snaplen");
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break;
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case 'b':
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if (start_filter_str) panic(5,"start filter already given");
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start_filter_str = g_strdup(optarg);
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break;
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case 'e':
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if (stop_filter_str) panic(6,"stop filter already given");
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stop_filter_str = g_strdup(optarg);
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break;
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case 'f':
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if (capture_filter_str) panic(7,"capture filter already given");
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capture_filter_str = g_strdup(optarg);
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break;
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case 'p':
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promisc = 1;
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break;
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case 'q':
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quiet = 1;
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break;
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case 'd':
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debug_level++;
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break;
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case 'h':
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default:
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usage(0);
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break;
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}
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}
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dprintf(1,"starting with:\n interface: %s\n snaplen: %d\n promisc: %d"
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"\n outfile: %s\n capture filter: %s\n start: %s\n stop: %s\n debug level: %d\n",
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interface ? interface : "to be chosen",
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snaplen,
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promisc,
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outfile ? outfile : "** missing **",
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capture_filter_str ? capture_filter_str : "** none given **",
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start_filter_str ? start_filter_str : "** missing **",
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stop_filter_str ? stop_filter_str : "** missing **",
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debug_level);
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if (! ( start_filter_str && stop_filter_str && outfile ) ) {
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usage(10);
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}
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if (! interface) {
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interface = pcap_lookupdev(errbuf);
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if (!interface) {
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panic(11, "could not obtain an interface: %s\n",errbuf);
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}
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}
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#ifdef HAVE_PCAP_OPEN
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if ( ! ( capturer = pcap_open(interface, snaplen, promisc, 1, NULL, errbuf) )) {
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#else
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if ( ! ( capturer = pcap_open_live(interface, snaplen, promisc, 1, errbuf) )) {
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#endif
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panic(12,"could not open interface '%s' for listener: %s\n",interface,errbuf);
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}
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dprintf(1,"opened listener (%s,%d,%d)\n",interface,snaplen, promisc);
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if (pcap_compile(listener, &start_filter, start_filter_str, 1, 0) < 0) {
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panic(13,"could not compile start filter: %s\n",pcap_geterr(listener));
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}
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dprintf(2,"compiled start filter %s\n",start_filter_str);
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if (pcap_compile(listener, &stop_filter, stop_filter_str, 1, 0) < 0) {
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panic(14,"could not compile stop filter: %s\n",pcap_geterr(listener));
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}
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dprintf(2,"compiled stop filter %s\n",stop_filter_str);
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#ifdef HAVE_PCAP_OPEN
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if ( ! ( capturer = pcap_open(interface, snaplen, promisc, 1, NULL, errbuf) )) {
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#else
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if ( ! ( capturer = pcap_open_live(interface, snaplen, promisc, 1, errbuf) )) {
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#endif
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panic(15,"could not open interface '%s' for capturer: %s\n",interface, errbuf);
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}
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dprintf(1,"opened capturer (%s,%d,%d)\n",interface,snaplen, promisc);
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if (capture_filter_str) {
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if (pcap_compile(capturer, &capture_filter, capture_filter_str, 1, 0) < 0) {
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panic(16,"could not compile capture filter: %s\n",pcap_geterr(capturer));
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}
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if (pcap_setfilter(capturer, &capture_filter) < 0) {
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panic(17,"could not apply start filter to capturer: %s\n",pcap_geterr(capturer));
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}
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dprintf(2,"compiled and set capture filter (%s)\n",capture_filter_str);
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}
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if (pcap_setfilter(listener, &start_filter) < 0) {
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panic(18,"could not apply start filter to listener: %s\n",pcap_geterr(listener));
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}
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dprintf(2,"set start filter on listener\n");
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if (pcap_setnonblock(listener, 0, errbuf) < 0) {
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panic(19,"could not set listener in blocking mode: %s\n",errbuf);
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}
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dprintf(2,"listener -> blocking\n");
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if (pcap_setnonblock(capturer, 1, errbuf) < 0) {
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panic(20,"could not set capturer in non blocking mode: %s\n",errbuf);
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}
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dprintf(2,"capturer -> non_blocking\n");
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if (! (dumper = pcap_dump_open(listener,outfile)) ) {
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panic(21,"open dumper file '%s': %s\n",outfile,pcap_geterr(listener));
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}
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dprintf(2,"opened dumper file '%s'\n",outfile);
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signal(SIGINT, sig_int);
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#ifdef SIGQUIT
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signal(SIGQUIT, sig_int);
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#endif
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#ifdef SIGTERM
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signal(SIGTERM, sig_int);
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#endif
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#ifdef SIGSTOP
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signal(SIGSTOP, sig_int);
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#endif
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keep_going = 1;
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dumping = 0;
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do {
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if (pcap_dispatch(listener, -1, listener_handler, NULL) < 0 ) {
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panic(22,"pcap_dispatch(listener) failed: %s\n",pcap_geterr(listener));
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}
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if (pcap_dispatch(capturer, -1, capture_handler, (void*)dumper) < 0 ) {
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panic(23,"pcap_dispatch(capturer) failed: %s\n",pcap_geterr(capturer));
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}
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} while(keep_going);
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if (!quiet) {
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printf("%d packets captured\n",captured);
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}
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dprintf(1,"done!\n");
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pcap_dump_close(dumper);
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pcap_close(listener);
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pcap_close(capturer);
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return 0;
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}
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