int
main(int argc, char *argv[])
{
EPCAP_STATE *ep = NULL;
pid_t pid = 0;
int ch = 0;
IS_NULL(ep = calloc(1, sizeof(EPCAP_STATE)));
ep->snaplen = SNAPLEN;
ep->timeout = TIMEOUT;
while ( (ch = getopt(argc, argv, "d:f:g:hi:MPs:t:u:v")) != -1) {
switch (ch) {
case 'd': /* chroot directory */
IS_NULL(ep->chroot = strdup(optarg));
break;
case 'f':
IS_NULL(ep->file = strdup(optarg));
ep->runasuser = 1;
break;
case 'g':
IS_NULL(ep->group = strdup(optarg));
break;
case 'i':
IS_NULL(ep->dev = strdup(optarg));
break;
case 'M':
ep->rfmon = 1;
break;
case 'P':
ep->promisc = 1;
break;
case 's':
ep->snaplen = (size_t)atoi(optarg);
break;
case 't':
ep->timeout = (u_int32_t)atoi(optarg);
break;
case 'u':
IS_NULL(ep->user = strdup(optarg));
break;
case 'v':
ep->verbose++;
break;
case 'N':
ep->no_lookupnet = 1;
break;
case 'I':
ep->filter_in = 1;
break;
case 'h':
default:
usage(ep);
}
}
argc -= optind;
argv += optind;
IS_NULL(ep->filt = strdup( (argc == 1) ? argv[0] : EPCAP_FILTER));
epcap_priv_issetuid(ep);
IS_LTZERO(epcap_open(ep));
if (epcap_priv_drop(ep) < 0)
exit (1);
switch (pid = fork()) {
case -1:
err(EXIT_FAILURE, "fork");
case 0:
(void)close(fileno(stdin));
IS_LTZERO(epcap_init(ep));
epcap_loop(ep);
break;
default:
(void)close(fileno(stdout));
pcap_close(ep->p);
epcap_watch();
(void)kill(pid, SIGTERM);
free(ep->filt);
free(ep);
break;
}
exit (0);
}
int
main(int argc, char *argv[])
{
EPCAP_STATE *ep = NULL;
pid_t pid = 0;
int ch = 0;
int fd = 0;
IS_NULL(ep = calloc(1, sizeof(EPCAP_STATE)));
ep->snaplen = SNAPLEN;
ep->timeout = TIMEOUT;
while ( (ch = getopt(argc, argv, "d:f:g:hi:MPs:t:u:v")) != -1) {
switch (ch) {
case 'd': /* chroot directory */
IS_NULL(ep->chroot = strdup(optarg));
break;
case 'f':
IS_NULL(ep->file = strdup(optarg));
ep->runasuser = 1;
break;
case 'g':
IS_NULL(ep->group = strdup(optarg));
break;
case 'i':
IS_NULL(ep->dev = strdup(optarg));
break;
case 'M':
ep->rfmon = 1;
break;
case 'P':
ep->promisc = 1;
break;
case 's':
ep->snaplen = (size_t)atoi(optarg);
break;
case 't':
ep->timeout = (u_int32_t)atoi(optarg);
break;
case 'u':
IS_NULL(ep->user = strdup(optarg));
break;
case 'v':
ep->verbose++;
break;
case 'h':
default:
usage(ep);
}
}
argc -= optind;
argv += optind;
IS_NULL(ep->filt = strdup( (argc == 1) ? argv[0] : EPCAP_FILTER));
IS_LTZERO(fd = open("/dev/null", O_RDWR));
epcap_priv_issetuid(ep);
IS_LTZERO(epcap_open(ep));
if (epcap_priv_drop(ep) < 0)
exit (1);
signal(SIGCHLD, gotsig);
switch (pid = fork()) {
case -1:
err(EXIT_FAILURE, "fork");
case 0:
IS_LTZERO(dup2(fd, STDIN_FILENO));
IS_LTZERO(close(fd));
IS_LTZERO(epcap_init(ep));
IS_LTZERO(epcap_priv_rlimits(EPCAP_RLIMIT_NOFILES));
epcap_loop(ep);
break;
default:
if ( (dup2(fd, STDOUT_FILENO) < 0) ||
(close(fd) < 0))
goto CLEANUP;
pcap_close(ep->p);
if (epcap_priv_rlimits(0) < 0)
goto CLEANUP;
epcap_watch();
CLEANUP:
(void)kill(pid, SIGTERM);
break;
}
exit (0);
}