nexmon – Rev 1
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/*
* 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
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <pcap.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifndef HAVE___ATTRIBUTE__
#define __attribute__(x)
#endif
static char *program_name;
/* Forwards */
static void usage(void) __attribute__((noreturn));
static void error(const char *, ...)
__attribute__((noreturn, format (printf, 1, 2)));
static void warn(const char *, ...)
__attribute__((format (printf, 1, 2)));
extern int optind;
extern int opterr;
extern char *optarg;
#ifdef BDEBUG
int dflag;
#endif
/*
* On Windows, we need to open the file in binary mode, so that
* we get all the bytes specified by the size we get from "fstat()".
* On UNIX, that's not necessary. O_BINARY is defined on Windows;
* we define it as 0 if it's not defined, so it does nothing.
*/
#ifndef O_BINARY
#define O_BINARY 0
#endif
static char *
read_infile(char *fname)
{
register int i, fd, cc;
register char *cp;
struct stat buf;
fd = open(fname, O_RDONLY|O_BINARY);
if (fd < 0)
error("can't open %s: %s", fname, pcap_strerror(errno));
if (fstat(fd, &buf) < 0)
error("can't stat %s: %s", fname, pcap_strerror(errno));
cp = malloc((u_int)buf.st_size + 1);
if (cp == NULL)
error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
fname, pcap_strerror(errno));
cc = read(fd, cp, (u_int)buf.st_size);
if (cc < 0)
error("read %s: %s", fname, pcap_strerror(errno));
if (cc != buf.st_size)
error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
close(fd);
/* replace "# comment" with spaces */
for (i = 0; i < cc; i++) {
if (cp[i] == '#')
while (i < cc && cp[i] != '\n')
cp[i++] = ' ';
}
cp[cc] = '\0';
return (cp);
}
/* 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
warn(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;
}
int
main(int argc, char **argv)
{
char *cp;
int op;
#ifndef BDEBUG
int dflag;
#endif
char *infile;
int Oflag;
long snaplen;
char *p;
int dlt;
bpf_u_int32 netmask = PCAP_NETMASK_UNKNOWN;
char *cmdbuf;
pcap_t *pd;
struct bpf_program fcode;
#ifdef WIN32
if(wsockinit() != 0) return 1;
#endif /* WIN32 */
#ifndef BDEBUG
dflag = 1;
#else
/* if optimizer debugging is enabled, output DOT graph
* `dflag=4' is equivalent to -dddd to follow -d/-dd/-ddd
* convention in tcpdump command line
*/
dflag = 4;
#endif
infile = NULL;
Oflag = 1;
snaplen = 68;
if ((cp = strrchr(argv[0], '/')) != NULL)
program_name = cp + 1;
else
program_name = argv[0];
opterr = 0;
while ((op = getopt(argc, argv, "dF:m:Os:")) != -1) {
switch (op) {
case 'd':
++dflag;
break;
case 'F':
infile = optarg;
break;
case 'O':
Oflag = 0;
break;
case 'm': {
in_addr_t addr;
addr = inet_addr(optarg);
if (addr == INADDR_NONE)
error("invalid netmask %s", optarg);
netmask = addr;
break;
}
case 's': {
char *end;
snaplen = strtol(optarg, &end, 0);
if (optarg == end || *end != '\0'
|| snaplen < 0 || snaplen > 65535)
error("invalid snaplen %s", optarg);
else if (snaplen == 0)
snaplen = 65535;
break;
}
default:
usage();
/* NOTREACHED */
}
}
if (optind >= argc) {
usage();
/* NOTREACHED */
}
dlt = pcap_datalink_name_to_val(argv[optind]);
if (dlt < 0) {
dlt = (int)strtol(argv[optind], &p, 10);
if (p == argv[optind] || *p != '\0')
error("invalid data link type %s", argv[optind]);
}
if (infile)
cmdbuf = read_infile(infile);
else
cmdbuf = copy_argv(&argv[optind+1]);
pd = pcap_open_dead(dlt, snaplen);
if (pd == NULL)
error("Can't open fake pcap_t");
if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
error("%s", pcap_geterr(pd));
if (!bpf_validate(fcode.bf_insns, fcode.bf_len))
warn("Filter doesn't pass validation");
#ifdef BDEBUG
// replace line feed with space
for (cp = cmdbuf; *cp != '\0'; ++cp) {
if (*cp == '\r' || *cp == '\n') {
*cp = ' ';
}
}
// only show machine code if BDEBUG defined, since dflag > 3
printf("machine codes for filter: %s\n", cmdbuf);
#endif
bpf_dump(&fcode, dflag);
pcap_close(pd);
exit(0);
}
static void
usage(void)
{
(void)fprintf(stderr, "%s, with %s\n", program_name,
pcap_lib_version());
(void)fprintf(stderr,
"Usage: %s [-dO] [ -F file ] [ -m netmask] [ -s snaplen ] dlt [ expression ]\n",
program_name);
exit(1);
}