288 lines
6.5 KiB
C
288 lines
6.5 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/select.h>
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#include <poll.h>
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#include <pcap.h>
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static char *program_name;
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/* Forwards */
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static void countme(u_char *, const struct pcap_pkthdr *, const u_char *);
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static void usage(void) __attribute__((noreturn));
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static void error(const char *, ...);
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static void warning(const char *, ...);
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static char *copy_argv(char **);
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static pcap_t *pd;
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extern int optind;
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extern int opterr;
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extern char *optarg;
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int
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main(int argc, char **argv)
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{
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register int op;
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register char *cp, *cmdbuf, *device;
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long longarg;
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char *p;
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int timeout = 1000;
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int immediate = 0;
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int nonblock = 0;
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bpf_u_int32 localnet, netmask;
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struct bpf_program fcode;
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char ebuf[PCAP_ERRBUF_SIZE];
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int status;
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int packet_count;
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device = NULL;
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if ((cp = strrchr(argv[0], '/')) != NULL)
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program_name = cp + 1;
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else
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program_name = argv[0];
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opterr = 0;
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while ((op = getopt(argc, argv, "i:mnt:")) != -1) {
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switch (op) {
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case 'i':
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device = optarg;
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break;
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case 'm':
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immediate = 1;
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break;
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case 'n':
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nonblock = 1;
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break;
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case 't':
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longarg = strtol(optarg, &p, 10);
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if (p == optarg || *p != '\0') {
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error("Timeout value \"%s\" is not a number",
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optarg);
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/* NOTREACHED */
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}
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if (longarg < 0) {
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error("Timeout value %ld is negative", longarg);
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/* NOTREACHED */
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}
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if (longarg > INT_MAX) {
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error("Timeout value %ld is too large (> %d)",
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longarg, INT_MAX);
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/* NOTREACHED */
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}
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timeout = (int)longarg;
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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if (device == NULL) {
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device = pcap_lookupdev(ebuf);
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if (device == NULL)
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error("%s", ebuf);
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}
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*ebuf = '\0';
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pd = pcap_create(device, ebuf);
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if (pd == NULL)
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error("%s", ebuf);
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status = pcap_set_snaplen(pd, 65535);
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if (status != 0)
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error("%s: pcap_set_snaplen failed: %s",
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device, pcap_statustostr(status));
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if (immediate) {
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status = pcap_set_immediate_mode(pd, 1);
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if (status != 0)
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error("%s: pcap_set_immediate_mode failed: %s",
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device, pcap_statustostr(status));
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}
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status = pcap_set_timeout(pd, timeout);
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if (status != 0)
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error("%s: pcap_set_timeout failed: %s",
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device, pcap_statustostr(status));
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status = pcap_activate(pd);
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if (status < 0) {
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/*
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* pcap_activate() failed.
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*/
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error("%s: %s\n(%s)", device,
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pcap_statustostr(status), pcap_geterr(pd));
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} else if (status > 0) {
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/*
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* pcap_activate() succeeded, but it's warning us
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* of a problem it had.
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*/
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warning("%s: %s\n(%s)", device,
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pcap_statustostr(status), pcap_geterr(pd));
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}
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if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
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localnet = 0;
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netmask = 0;
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warning("%s", ebuf);
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}
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cmdbuf = copy_argv(&argv[optind]);
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if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0)
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error("%s", pcap_geterr(pd));
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if (pcap_setfilter(pd, &fcode) < 0)
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error("%s", pcap_geterr(pd));
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if (pcap_setnonblock(pd, nonblock, ebuf) == -1)
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error("pcap_setnonblock failed: %s", ebuf);
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printf("Listening on %s\n", device);
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for (;;) {
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packet_count = 0;
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status = pcap_dispatch(pd, -1, countme,
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(u_char *)&packet_count);
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if (status < 0)
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break;
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if (status != 0) {
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printf("%d packets seen, %d packets counted after pcap_dispatch returns\n",
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status, packet_count);
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}
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}
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if (status == -2) {
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/*
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* We got interrupted, so perhaps we didn't
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* manage to finish a line we were printing.
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* Print an extra newline, just in case.
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*/
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putchar('\n');
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}
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(void)fflush(stdout);
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if (status == -1) {
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/*
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* Error. Report it.
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*/
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(void)fprintf(stderr, "%s: pcap_loop: %s\n",
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program_name, pcap_geterr(pd));
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}
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pcap_close(pd);
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exit(status == -1 ? 1 : 0);
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}
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static void
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countme(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
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{
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int *counterp = (int *)user;
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(*counterp)++;
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "Usage: %s [ -mn ] [ -i interface ] [ -t timeout] [expression]\n",
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program_name);
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exit(1);
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}
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/* VARARGS */
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static void
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error(const char *fmt, ...)
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{
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va_list ap;
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(void)fprintf(stderr, "%s: ", program_name);
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va_start(ap, fmt);
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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if (*fmt) {
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fmt += strlen(fmt);
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if (fmt[-1] != '\n')
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(void)fputc('\n', stderr);
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}
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exit(1);
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/* NOTREACHED */
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}
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/* VARARGS */
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static void
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warning(const char *fmt, ...)
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{
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va_list ap;
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(void)fprintf(stderr, "%s: WARNING: ", program_name);
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va_start(ap, fmt);
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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if (*fmt) {
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fmt += strlen(fmt);
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if (fmt[-1] != '\n')
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(void)fputc('\n', stderr);
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}
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}
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/*
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* Copy arg vector into a new buffer, concatenating arguments with spaces.
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*/
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static char *
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copy_argv(register char **argv)
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{
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register char **p;
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register u_int len = 0;
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char *buf;
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char *src, *dst;
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p = argv;
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if (*p == 0)
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return 0;
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while (*p)
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len += strlen(*p++) + 1;
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buf = (char *)malloc(len);
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if (buf == NULL)
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error("copy_argv: malloc");
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p = argv;
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dst = buf;
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while ((src = *p++) != NULL) {
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while ((*dst++ = *src++) != '\0')
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;
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dst[-1] = ' ';
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}
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dst[-1] = '\0';
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return buf;
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}
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