334 lines
8.1 KiB
C
334 lines
8.1 KiB
C
/*
|
|
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that: (1) source code distributions
|
|
* retain the above copyright notice and this paragraph in its entirety, (2)
|
|
* distributions including binary code include the above copyright notice and
|
|
* this paragraph in its entirety in the documentation or other materials
|
|
* provided with the distribution, and (3) all advertising materials mentioning
|
|
* features or use of this software display the following acknowledgement:
|
|
* ``This product includes software developed by the University of California,
|
|
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
|
|
* the University nor the names of its contributors may be used to endorse
|
|
* or promote products derived from this software without specific prior
|
|
* written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char copyright[] _U_ =
|
|
"@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
|
|
The Regents of the University of California. All rights reserved.\n";
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdarg.h>
|
|
#include <limits.h>
|
|
#ifdef _WIN32
|
|
#include "getopt.h"
|
|
#else
|
|
#include <unistd.h>
|
|
#endif
|
|
#include <errno.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <pcap.h>
|
|
|
|
static char *program_name;
|
|
|
|
/*
|
|
* This was introduced by Clang:
|
|
*
|
|
* http://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
|
|
*
|
|
* in some version (which version?); it has been picked up by GCC 5.0.
|
|
*/
|
|
#ifndef __has_attribute
|
|
/*
|
|
* It's a macro, so you can check whether it's defined to check
|
|
* whether it's supported.
|
|
*
|
|
* If it's not, define it to always return 0, so that we move on to
|
|
* the fallback checks.
|
|
*/
|
|
#define __has_attribute(x) 0
|
|
#endif
|
|
|
|
#if __has_attribute(noreturn) \
|
|
|| (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)) \
|
|
|| (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)) \
|
|
|| (defined(__xlC__) && __xlC__ >= 0x0A01) \
|
|
|| (defined(__HP_aCC) && __HP_aCC >= 61000)
|
|
/*
|
|
* Compiler with support for it, or GCC 2.5 and later, or Solaris Studio 12
|
|
* (Sun C 5.9) and later, or IBM XL C 10.1 and later (do any earlier
|
|
* versions of XL C support this?), or HP aCC A.06.10 and later.
|
|
*/
|
|
#define PCAP_NORETURN __attribute((noreturn))
|
|
#elif defined( _MSC_VER )
|
|
#define PCAP_NORETURN __declspec(noreturn)
|
|
#else
|
|
#define PCAP_NORETURN
|
|
#endif
|
|
|
|
#if __has_attribute(__format__) \
|
|
|| (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 203)) \
|
|
|| (defined(__xlC__) && __xlC__ >= 0x0A01) \
|
|
|| (defined(__HP_aCC) && __HP_aCC >= 61000)
|
|
/*
|
|
* Compiler with support for it, or GCC 2.3 and later, or IBM XL C 10.1
|
|
* and later (do any earlier versions of XL C support this?),
|
|
* or HP aCC A.06.10 and later.
|
|
*/
|
|
#define PCAP_PRINTFLIKE(x,y) __attribute__((__format__(__printf__,x,y)))
|
|
#else
|
|
#define PCAP_PRINTFLIKE(x,y)
|
|
#endif
|
|
|
|
/* Forwards */
|
|
static void countme(u_char *, const struct pcap_pkthdr *, const u_char *);
|
|
static void PCAP_NORETURN usage(void);
|
|
static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
|
|
static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
|
|
static char *copy_argv(char **);
|
|
|
|
static pcap_t *pd;
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
register int op;
|
|
register char *cp, *cmdbuf, *device;
|
|
long longarg;
|
|
char *p;
|
|
int timeout = 1000;
|
|
int immediate = 0;
|
|
int nonblock = 0;
|
|
bpf_u_int32 localnet, netmask;
|
|
struct bpf_program fcode;
|
|
char ebuf[PCAP_ERRBUF_SIZE];
|
|
int status;
|
|
int packet_count;
|
|
|
|
device = NULL;
|
|
if ((cp = strrchr(argv[0], '/')) != NULL)
|
|
program_name = cp + 1;
|
|
else
|
|
program_name = argv[0];
|
|
|
|
opterr = 0;
|
|
while ((op = getopt(argc, argv, "i:mnt:")) != -1) {
|
|
switch (op) {
|
|
|
|
case 'i':
|
|
device = optarg;
|
|
break;
|
|
|
|
case 'm':
|
|
immediate = 1;
|
|
break;
|
|
|
|
case 'n':
|
|
nonblock = 1;
|
|
break;
|
|
|
|
case 't':
|
|
longarg = strtol(optarg, &p, 10);
|
|
if (p == optarg || *p != '\0') {
|
|
error("Timeout value \"%s\" is not a number",
|
|
optarg);
|
|
/* NOTREACHED */
|
|
}
|
|
if (longarg < 0) {
|
|
error("Timeout value %ld is negative", longarg);
|
|
/* NOTREACHED */
|
|
}
|
|
if (longarg > INT_MAX) {
|
|
error("Timeout value %ld is too large (> %d)",
|
|
longarg, INT_MAX);
|
|
/* NOTREACHED */
|
|
}
|
|
timeout = (int)longarg;
|
|
break;
|
|
|
|
default:
|
|
usage();
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
|
|
if (device == NULL) {
|
|
device = pcap_lookupdev(ebuf);
|
|
if (device == NULL)
|
|
error("%s", ebuf);
|
|
}
|
|
*ebuf = '\0';
|
|
pd = pcap_create(device, ebuf);
|
|
if (pd == NULL)
|
|
error("%s", ebuf);
|
|
status = pcap_set_snaplen(pd, 65535);
|
|
if (status != 0)
|
|
error("%s: pcap_set_snaplen failed: %s",
|
|
device, pcap_statustostr(status));
|
|
if (immediate) {
|
|
status = pcap_set_immediate_mode(pd, 1);
|
|
if (status != 0)
|
|
error("%s: pcap_set_immediate_mode failed: %s",
|
|
device, pcap_statustostr(status));
|
|
}
|
|
status = pcap_set_timeout(pd, timeout);
|
|
if (status != 0)
|
|
error("%s: pcap_set_timeout failed: %s",
|
|
device, pcap_statustostr(status));
|
|
status = pcap_activate(pd);
|
|
if (status < 0) {
|
|
/*
|
|
* pcap_activate() failed.
|
|
*/
|
|
error("%s: %s\n(%s)", device,
|
|
pcap_statustostr(status), pcap_geterr(pd));
|
|
} else if (status > 0) {
|
|
/*
|
|
* pcap_activate() succeeded, but it's warning us
|
|
* of a problem it had.
|
|
*/
|
|
warning("%s: %s\n(%s)", device,
|
|
pcap_statustostr(status), pcap_geterr(pd));
|
|
}
|
|
if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
|
|
localnet = 0;
|
|
netmask = 0;
|
|
warning("%s", ebuf);
|
|
}
|
|
cmdbuf = copy_argv(&argv[optind]);
|
|
|
|
if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0)
|
|
error("%s", pcap_geterr(pd));
|
|
|
|
if (pcap_setfilter(pd, &fcode) < 0)
|
|
error("%s", pcap_geterr(pd));
|
|
if (pcap_setnonblock(pd, nonblock, ebuf) == -1)
|
|
error("pcap_setnonblock failed: %s", ebuf);
|
|
printf("Listening on %s\n", device);
|
|
for (;;) {
|
|
packet_count = 0;
|
|
status = pcap_dispatch(pd, -1, countme,
|
|
(u_char *)&packet_count);
|
|
if (status < 0)
|
|
break;
|
|
if (status != 0) {
|
|
printf("%d packets seen, %d packets counted after pcap_dispatch returns\n",
|
|
status, packet_count);
|
|
}
|
|
}
|
|
if (status == -2) {
|
|
/*
|
|
* We got interrupted, so perhaps we didn't
|
|
* manage to finish a line we were printing.
|
|
* Print an extra newline, just in case.
|
|
*/
|
|
putchar('\n');
|
|
}
|
|
(void)fflush(stdout);
|
|
if (status == -1) {
|
|
/*
|
|
* Error. Report it.
|
|
*/
|
|
(void)fprintf(stderr, "%s: pcap_loop: %s\n",
|
|
program_name, pcap_geterr(pd));
|
|
}
|
|
pcap_close(pd);
|
|
exit(status == -1 ? 1 : 0);
|
|
}
|
|
|
|
static void
|
|
countme(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
|
|
{
|
|
int *counterp = (int *)user;
|
|
|
|
(*counterp)++;
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr, "Usage: %s [ -mn ] [ -i interface ] [ -t timeout] [expression]\n",
|
|
program_name);
|
|
exit(1);
|
|
}
|
|
|
|
/* VARARGS */
|
|
static void
|
|
error(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
(void)fprintf(stderr, "%s: ", program_name);
|
|
va_start(ap, fmt);
|
|
(void)vfprintf(stderr, fmt, ap);
|
|
va_end(ap);
|
|
if (*fmt) {
|
|
fmt += strlen(fmt);
|
|
if (fmt[-1] != '\n')
|
|
(void)fputc('\n', stderr);
|
|
}
|
|
exit(1);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/* VARARGS */
|
|
static void
|
|
warning(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
(void)fprintf(stderr, "%s: WARNING: ", program_name);
|
|
va_start(ap, fmt);
|
|
(void)vfprintf(stderr, fmt, ap);
|
|
va_end(ap);
|
|
if (*fmt) {
|
|
fmt += strlen(fmt);
|
|
if (fmt[-1] != '\n')
|
|
(void)fputc('\n', stderr);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Copy arg vector into a new buffer, concatenating arguments with spaces.
|
|
*/
|
|
static char *
|
|
copy_argv(register char **argv)
|
|
{
|
|
register char **p;
|
|
register u_int len = 0;
|
|
char *buf;
|
|
char *src, *dst;
|
|
|
|
p = argv;
|
|
if (*p == 0)
|
|
return 0;
|
|
|
|
while (*p)
|
|
len += strlen(*p++) + 1;
|
|
|
|
buf = (char *)malloc(len);
|
|
if (buf == NULL)
|
|
error("copy_argv: malloc");
|
|
|
|
p = argv;
|
|
dst = buf;
|
|
while ((src = *p++) != NULL) {
|
|
while ((*dst++ = *src++) != '\0')
|
|
;
|
|
dst[-1] = ' ';
|
|
}
|
|
dst[-1] = '\0';
|
|
|
|
return buf;
|
|
}
|