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 <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>
#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
/* BSD-flavored OS - use BPF */
#define USE_BPF
#elif defined(linux)
/* Linux - use socket filters */
#define USE_SOCKET_FILTERS
#else
#error "Unknown platform or platform that doesn't support Valgrind"
#endif
#if defined(USE_BPF)
#include <sys/ioctl.h>
#include <net/bpf.h>
/*
* Make "pcap.h" not include "pcap/bpf.h"; we are going to include the
* native OS version, as we're going to be doing our own ioctls to
* make sure that, in the uninitialized-data tests, the filters aren't
* checked by libpcap before being handed to BPF.
*/
#define PCAP_DONT_INCLUDE_PCAP_BPF_H
#elif defined(USE_SOCKET_FILTERS)
#include <sys/socket.h>
#include <linux/types.h>
#include <linux/filter.h>
#endif
#include <pcap.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 warning(const char *, ...)
__attribute__((format (printf, 1, 2)));
extern int optind;
extern int opterr;
extern char *optarg;
/*
* 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
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;
}
#define INSN_COUNT 17
int
main(int argc, char **argv)
{
char *cp, *device;
int op;
int dorfmon, useactivate;
char ebuf[PCAP_ERRBUF_SIZE];
char *infile;
char *cmdbuf;
pcap_t *pd;
int status = 0;
int pcap_fd;
#if defined(USE_BPF)
struct bpf_program bad_fcode;
struct bpf_insn uninitialized[INSN_COUNT];
#elif defined(USE_SOCKET_FILTERS)
struct sock_fprog bad_fcode;
struct sock_filter uninitialized[INSN_COUNT];
#endif
struct bpf_program fcode;
device = NULL;
dorfmon = 0;
useactivate = 0;
infile = NULL;
if ((cp = strrchr(argv[0], '/')) != NULL)
program_name = cp + 1;
else
program_name = argv[0];
opterr = 0;
while ((op = getopt(argc, argv, "aF:i:I")) != -1) {
switch (op) {
case 'a':
useactivate = 1;
break;
case 'F':
infile = optarg;
break;
case 'i':
device = optarg;
break;
case 'I':
dorfmon = 1;
useactivate = 1; /* required for rfmon */
break;
default:
usage();
/* NOTREACHED */
}
}
if (device == NULL) {
/*
* No interface specified; get whatever pcap_lookupdev()
* finds.
*/
device = pcap_lookupdev(ebuf);
if (device == NULL) {
error("couldn't find interface to use: %s",
ebuf);
}
}
if (infile != NULL) {
/*
* Filter specified with "-F" and a file containing
* a filter.
*/
cmdbuf = read_infile(infile);
} else {
if (optind < argc) {
/*
* Filter specified with arguments on the
* command line.
*/
cmdbuf = copy_argv(&argv[optind+1]);
} else {
/*
* No filter specified; use an empty string, which
* compiles to an "accept all" filter.
*/
cmdbuf = "";
}
}
if (useactivate) {
pd = pcap_create(device, ebuf);
if (pd == NULL)
error("%s: pcap_create() failed: %s", device, ebuf);
status = pcap_set_snaplen(pd, 65535);
if (status != 0)
error("%s: pcap_set_snaplen failed: %s",
device, pcap_statustostr(status));
status = pcap_set_promisc(pd, 1);
if (status != 0)
error("%s: pcap_set_promisc failed: %s",
device, pcap_statustostr(status));
if (dorfmon) {
status = pcap_set_rfmon(pd, 1);
if (status != 0)
error("%s: pcap_set_rfmon failed: %s",
device, pcap_statustostr(status));
}
status = pcap_set_timeout(pd, 1000);
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));
}
} else {
*ebuf = '\0';
pd = pcap_open_live(device, 65535, 1, 1000, ebuf);
if (pd == NULL)
error("%s", ebuf);
else if (*ebuf)
warning("%s", ebuf);
}
pcap_fd = pcap_fileno(pd);
/*
* Try setting a filter with an uninitialized bpf_program
* structure. This should cause valgrind to report a
* problem.
*
* We don't check for errors, because it could get an
* error due to a bad pointer or count.
*/
#if defined(USE_BPF)
ioctl(pcap_fd, BIOCSETF, &bad_fcode);
#elif defined(USE_SOCKET_FILTERS)
setsockopt(pcap_fd, SOL_SOCKET, SO_ATTACH_FILTER, &bad_fcode,
sizeof(bad_fcode));
#endif
/*
* Try setting a filter with an initialized bpf_program
* structure that points to an uninitialized program.
* That should also cause valgrind to report a problem.
*
* We don't check for errors, because it could get an
* error due to a bad pointer or count.
*/
#if defined(USE_BPF)
bad_fcode.bf_len = INSN_COUNT;
bad_fcode.bf_insns = uninitialized;
ioctl(pcap_fd, BIOCSETF, &bad_fcode);
#elif defined(USE_SOCKET_FILTERS)
bad_fcode.len = INSN_COUNT;
bad_fcode.filter = uninitialized;
setsockopt(pcap_fd, SOL_SOCKET, SO_ATTACH_FILTER, &bad_fcode,
sizeof(bad_fcode));
#endif
/*
* Now compile a filter and set the filter with that.
* That should *not* cause valgrind to report a
* problem.
*/
if (pcap_compile(pd, &fcode, cmdbuf, 1, 0) < 0)
error("can't compile filter: %s", pcap_geterr(pd));
if (pcap_setfilter(pd, &fcode) < 0)
error("can't set filter: %s", pcap_geterr(pd));
pcap_close(pd);
exit(status < 0 ? 1 : 0);
}
static void
usage(void)
{
(void)fprintf(stderr, "%s, with %s\n", program_name,
pcap_lib_version());
(void)fprintf(stderr,
"Usage: %s [-aI] [ -F file ] [ -I interface ] [ expression ]\n",
program_name);
exit(1);
}