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[] =
"@(#) 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 <pcap.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/select.h>
#include <poll.h>
char *program_name;
/* Forwards */
static void countme(u_char *, const struct pcap_pkthdr *, const u_char *);
static void usage(void) __attribute__((noreturn));
static void error(const char *, ...);
static void warning(const char *, ...);
static char *copy_argv(char **);
static pcap_t *pd;
extern int optind;
extern int opterr;
extern char *optarg;
int
main(int argc, char **argv)
{
register int op;
bpf_u_int32 localnet, netmask;
register char *cp, *cmdbuf, *device;
int doselect, dopoll, dotimeout, dononblock;
struct bpf_program fcode;
char ebuf[PCAP_ERRBUF_SIZE];
int selectable_fd;
int status;
int packet_count;
device = NULL;
doselect = 0;
dopoll = 0;
dotimeout = 0;
dononblock = 0;
if ((cp = strrchr(argv[0], '/')) != NULL)
program_name = cp + 1;
else
program_name = argv[0];
opterr = 0;
while ((op = getopt(argc, argv, "i:sptn")) != -1) {
switch (op) {
case 'i':
device = optarg;
break;
case 's':
doselect = 1;
break;
case 'p':
dopoll = 1;
break;
case 't':
dotimeout = 1;
break;
case 'n':
dononblock = 1;
break;
default:
usage();
/* NOTREACHED */
}
}
if (doselect && dopoll) {
fprintf(stderr, "selpolltest: choose select (-s) or poll (-p), but not both\n");
return 1;
}
if (dotimeout && !doselect && !dopoll) {
fprintf(stderr, "selpolltest: timeout (-t) requires select (-s) or poll (-p)\n");
return 1;
}
if (device == NULL) {
device = pcap_lookupdev(ebuf);
if (device == NULL)
error("%s", ebuf);
}
*ebuf = '\0';
pd = pcap_open_live(device, 65535, 0, 1000, ebuf);
if (pd == NULL)
error("%s", ebuf);
else if (*ebuf)
warning("%s", ebuf);
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_get_selectable_fd(pd) == -1)
error("pcap_get_selectable_fd() fails");
if (dononblock) {
if (pcap_setnonblock(pd, 1, ebuf) == -1)
error("pcap_setnonblock failed: %s", ebuf);
}
selectable_fd = pcap_get_selectable_fd(pd);
printf("Listening on %s\n", device);
if (doselect) {
for (;;) {
fd_set setread, setexcept;
struct timeval seltimeout;
FD_ZERO(&setread);
FD_SET(selectable_fd, &setread);
FD_ZERO(&setexcept);
FD_SET(selectable_fd, &setexcept);
if (dotimeout) {
seltimeout.tv_sec = 0;
seltimeout.tv_usec = 1000;
status = select(selectable_fd + 1, &setread,
NULL, &setexcept, &seltimeout);
} else {
status = select(selectable_fd + 1, &setread,
NULL, &setexcept, NULL);
}
if (status == -1) {
printf("Select returns error (%s)\n",
strerror(errno));
} else {
if (status == 0)
printf("Select timed out: ");
else
printf("Select returned a descriptor: ");
if (FD_ISSET(selectable_fd, &setread))
printf("readable, ");
else
printf("not readable, ");
if (FD_ISSET(selectable_fd, &setexcept))
printf("exceptional condition\n");
else
printf("no exceptional condition\n");
packet_count = 0;
status = pcap_dispatch(pd, -1, countme,
(u_char *)&packet_count);
if (status < 0)
break;
printf("%d packets seen, %d packets counted after select returns\n",
status, packet_count);
}
}
} else if (dopoll) {
for (;;) {
struct pollfd fd;
int polltimeout;
fd.fd = selectable_fd;
fd.events = POLLIN;
if (dotimeout)
polltimeout = 1;
else
polltimeout = -1;
status = poll(&fd, 1, polltimeout);
if (status == -1) {
printf("Poll returns error (%s)\n",
strerror(errno));
} else {
if (status == 0)
printf("Poll timed out\n");
else {
printf("Poll returned a descriptor: ");
if (fd.revents & POLLIN)
printf("readable, ");
else
printf("not readable, ");
if (fd.revents & POLLERR)
printf("exceptional condition, ");
else
printf("no exceptional condition, ");
if (fd.revents & POLLHUP)
printf("disconnect, ");
else
printf("no disconnect, ");
if (fd.revents & POLLNVAL)
printf("invalid\n");
else
printf("not invalid\n");
}
packet_count = 0;
status = pcap_dispatch(pd, -1, countme,
(u_char *)&packet_count);
if (status < 0)
break;
printf("%d packets seen, %d packets counted after poll returns\n",
status, packet_count);
}
}
} else {
for (;;) {
packet_count = 0;
status = pcap_dispatch(pd, -1, countme,
(u_char *)&packet_count);
if (status < 0)
break;
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 [ -sptn ] [ -i interface ] [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;
}