/*
* 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.
*/
#include "varattrs.h"
#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>
#ifndef _WIN32
#include <signal.h>
#endif
#include <sys/types.h>
#include <pcap.h>
#include "pcap/funcattrs.h"
#ifdef _WIN32
#include "portability.h"
#endif
static char *program_name;
/* Forwards */
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;
#ifdef _WIN32
static BOOL WINAPI
stop_capture(DWORD ctrltype _U_)
{
pcap_breakloop(pd);
return TRUE;
}
#else
static void
stop_capture(int signum _U_)
{
pcap_breakloop(pd);
}
#endif
static long
parse_interface_number(const char *device)
{
const char *p;
long devnum;
char *end;
/*
* Search for a colon, terminating any scheme at the beginning
* of the device.
*/
p = strchr(device, ':');
if (p != NULL) {
/*
* We found it. Is it followed by "//"?
*/
p++; /* skip the : */
if (strncmp(p, "//", 2) == 0) {
/*
* Yes. Search for the next /, at the end of the
* authority part of the URL.
*/
p += 2; /* skip the // */
p = strchr(p, '/');
if (p != NULL) {
/*
* OK, past the / is the path.
*/
device = p + 1;
}
}
}
devnum = strtol(device, &end, 10);
if (device != end && *end == '\0') {
/*
* It's all-numeric, but is it a valid number?
*/
if (devnum <= 0) {
/*
* No, it's not an ordinal.
*/
error("Invalid adapter index");
}
return (devnum);
} else {
/*
* It's not all-numeric; return -1, so our caller
* knows that.
*/
return (-1);
}
}
static char *
find_interface_by_number(long devnum)
{
pcap_if_t *dev, *devlist;
long i;
char ebuf[PCAP_ERRBUF_SIZE];
char *device;
int status;
status = pcap_findalldevs(&devlist, ebuf);
if (status < 0)
error("%s", ebuf);
/*
* Look for the devnum-th entry in the list of devices (1-based).
*/
for (i = 0, dev = devlist; i < devnum-1 && dev != NULL;
i++, dev = dev->next)
;
if (dev == NULL)
error("Invalid adapter index");
device = strdup(dev->name);
pcap_freealldevs(devlist);
return (device);
}
static pcap_t *
open_interface(const char *device, int snaplen_set, int snaplen, char *ebuf)
{
pcap_t *pc;
int status;
char *cp;
pc = pcap_create(device, ebuf);
if (pc == NULL) {
/*
* If this failed with "No such device", that means
* the interface doesn't exist; return NULL, so that
* the caller can see whether the device name is
* actually an interface index.
*/
if (strstr(ebuf, "No such device") != NULL)
return (NULL);
error("%s", ebuf);
}
if (snaplen_set) {
status = pcap_set_snaplen(pc, snaplen);
if (status != 0)
error("%s: pcap_set_snaplen failed: %s",
device, pcap_statustostr(status));
}
status = pcap_set_timeout(pc, 100);
if (status != 0)
error("%s: pcap_set_timeout failed: %s",
device, pcap_statustostr(status));
status = pcap_activate(pc);
if (status < 0) {
/*
* pcap_activate() failed.
*/
cp = pcap_geterr(pc);
if (status == PCAP_ERROR)
error("%s", cp);
else if (status == PCAP_ERROR_NO_SUCH_DEVICE) {
/*
* Return an error for our caller to handle.
*/
snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s\n(%s)",
device, pcap_statustostr(status), cp);
} else if (status == PCAP_ERROR_PERM_DENIED && *cp != '\0')
error("%s: %s\n(%s)", device,
pcap_statustostr(status), cp);
else
error("%s: %s", device,
pcap_statustostr(status));
pcap_close(pc);
return (NULL);
} else if (status > 0) {
/*
* pcap_activate() succeeded, but it's warning us
* of a problem it had.
*/
cp = pcap_geterr(pc);
if (status == PCAP_WARNING)
warning("%s", cp);
else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
*cp != '\0')
warning("%s: %s\n(%s)", device,
pcap_statustostr(status), cp);
else
warning("%s: %s", device,
pcap_statustostr(status));
}
return (pc);
}
#define COMMAND_OPTIONS "DLi:s:w:y:"
int
main(int argc, char **argv)
{
int op;
char *cp, *cmdbuf = NULL, *device, *end, *savefile = NULL;
int snaplen = 0;
int snaplen_set = 0;
pcap_if_t *devlist;
long devnum;
int show_interfaces = 0;
int show_dlt_types = 0;
int ndlts;
int *dlts;
bpf_u_int32 localnet, netmask;
struct bpf_program fcode;
char ebuf[PCAP_ERRBUF_SIZE];
#ifndef _WIN32
struct sigaction action;
#endif
int dlt;
const char *dlt_name = NULL;
int status;
pcap_dumper_t *pdd;
device = NULL;
if ((cp = strrchr(argv[0], '/')) != NULL)
program_name = cp + 1;
else
program_name = argv[0];
opterr = 0;
while ((op = getopt(argc, argv, COMMAND_OPTIONS)) != -1) {
switch (op) {
case 'D':
show_interfaces = 1;
break;
case 'L':
show_dlt_types = 1;
break;
case 'i':
device = optarg;
break;
case 's':
snaplen = (int)strtol(optarg, &end, 0);
if (optarg == end || *end != '\0' || snaplen < 0)
error("invalid snaplen %s (must be >= 0)",
optarg);
snaplen_set = 1;
break;
case 'w':
savefile = optarg;
break;
case 'y':
dlt_name = optarg;
break;
default:
usage();
/* NOTREACHED */
}
}
if (show_interfaces) {
pcap_if_t *dev;
int i;
if (pcap_findalldevs(&devlist, ebuf) < 0)
error("%s", ebuf);
for (i = 0, dev = devlist; dev != NULL; i++, dev = dev->next) {
printf("%d.%s", i+1, dev->name);
if (dev->description != NULL)
printf(" (%s)", dev->description);
printf("\n");
}
pcap_freealldevs(devlist);
return (0);
}
if (device == NULL) {
if (pcap_findalldevs(&devlist, ebuf) == -1)
error("%s", ebuf);
if (devlist == NULL)
error("no interfaces available for capture");
device = strdup(devlist->name);
pcap_freealldevs(devlist);
}
if (show_dlt_types) {
pd = pcap_create(device, ebuf);
if (pd == NULL)
error("%s", ebuf);
status = pcap_activate(pd);
if (status < 0) {
/*
* pcap_activate() failed.
*/
error("%s: %s\n(%s)", device,
pcap_statustostr(status), pcap_geterr(pd));
}
ndlts = pcap_list_datalinks(pd, &dlts);
if (ndlts < 0) {
/*
* pcap_list_datalinks() failed.
*/
error("%s: %s\n(%s)", device,
pcap_statustostr(status), pcap_geterr(pd));
}
for (int i = 0; i < ndlts; i++) {
dlt_name = pcap_datalink_val_to_name(dlts[i]);
if (dlt_name == NULL)
printf("DLT %d", dlts[i]);
else
printf("%s", dlt_name);
printf("\n");
}
pcap_free_datalinks(dlts);
pcap_close(pd);
return 0;
}
if (savefile == NULL)
error("no savefile specified");
*ebuf = '\0';
pd = open_interface(device, snaplen_set, snaplen, ebuf);
if (pd == NULL) {
/*
* That failed because the interface couldn't be found.
*
* If we can get a list of interfaces, and the interface name
* is purely numeric, try to use it as a 1-based index
* in the list of interfaces.
*/
devnum = parse_interface_number(device);
if (devnum == -1) {
/*
* It's not a number; just report
* the open error and fail.
*/
error("%s", ebuf);
}
/*
* OK, it's a number; try to find the
* interface with that index, and try
* to open it.
*
* find_interface_by_number() exits if it
* couldn't be found.
*/
device = find_interface_by_number(devnum);
pd = open_interface(device, snaplen_set, snaplen, ebuf);
if (pd == NULL)
error("%s", ebuf);
}
if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
localnet = 0;
netmask = 0;
warning("%s", ebuf);
}
if (dlt_name != NULL) {
dlt = pcap_datalink_name_to_val(dlt_name);
if (dlt == PCAP_ERROR)
error("%s isn't a valid DLT name", dlt_name);
if (pcap_set_datalink(pd, dlt) == PCAP_ERROR)
error("%s: %s", device, pcap_geterr(pd));
}
/*
* Don't set a filter unless we were given one on the
* command line; if capturing doesn't work, or doesn't
* use the snapshot length, without a filter, that's
* a bug.
*/
if (optind < argc) {
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));
}
pdd = pcap_dump_open(pd, savefile);
if (pdd == NULL)
error("%s", pcap_geterr(pd));
#ifdef _WIN32
SetConsoleCtrlHandler(stop_capture, TRUE);
#else
action.sa_handler = stop_capture;
sigemptyset(&action.sa_mask);
action.sa_flags = 0;
if (sigaction(SIGINT, &action, NULL) == -1)
error("Can't catch SIGINT: %s\n", strerror(errno));
#endif
printf("Listening on %s, link-type ", device);
dlt = pcap_datalink(pd);
dlt_name = pcap_datalink_val_to_name(dlt);
if (dlt_name == NULL)
printf("DLT %d", dlt);
else
printf("%s", dlt_name);
printf("\n");
for (;;) {
status = pcap_dispatch(pd, -1, pcap_dump, (u_char *)pdd);
if (status < 0)
break;
if (status != 0) {
printf("%d packets seen\n", status);
struct pcap_stat ps;
pcap_stats(pd, &ps);
printf("%d ps_recv, %d ps_drop, %d ps_ifdrop\n",
ps.ps_recv, ps.ps_drop, ps.ps_ifdrop);
}
}
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');
printf("Broken out of loop from SIGINT handler\n");
}
(void)fflush(stdout);
if (status == -1) {
/*
* Error. Report it.
*/
(void)fprintf(stderr, "%s: pcap_dispatch: %s\n",
program_name, pcap_geterr(pd));
}
pcap_close(pd);
if (cmdbuf != NULL) {
pcap_freecode(&fcode);
free(cmdbuf);
}
exit(status == -1 ? 1 : 0);
}
static void
usage(void)
{
(void)fprintf(stderr, "Usage: %s -D -L [ -i interface ] [ -s snaplen ] [ -w file ] [ -y dlt ] [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 size_t 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;
}
