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Added promiscous mode option.

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This commit is contained in:
pdw
2002-03-27 17:28:35 +00:00
parent c23b7e5cfd
commit 40dc2c58a0
2 changed files with 127 additions and 129 deletions
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34
iftop.c
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@@ -34,6 +34,8 @@ int history_pos = 0;
int history_len = 1;
pthread_mutex_t tick_mutex;
int promiscuous = 0;
sig_atomic_t foad;
static void finish(int sig) {
@@ -112,22 +114,24 @@ static void handle_packet(char* args, const struct pcap_pkthdr* pkthdr,const cha
iptr = (struct ip*)(packet + sizeof(struct ether_header)); /* alignment? */
if (memcmp(eptr->ether_shost, if_hw_addr, 6) == 0) {
if(memcmp(eptr->ether_shost, if_hw_addr, 6) == 0 ) {
/* Packet leaving this interface. */
ap.src = iptr->ip_src;
ap.dst = iptr->ip_dst;
} else {
/* Assume it's a packet arriving at this interface. This is OK,
* since packets which don't have this interface as their source or
* destination should all be broadcast packets, which are
* incoming.
* XXX this results in a confusing display:
* 10.1.2.255 => foo.bar.com 0b 0b 0b
* <= 1k 1k 1k
* FIXME? */
}
else if(memcmp(eptr->ether_dhost, if_hw_addr, 6) == 0 || memcmp("\xFF\xFF\xFF\xFF\xFF\xFF", eptr->ether_dhost, 6) == 0) {
ap.src = iptr->ip_dst;
ap.dst = iptr->ip_src;
}
else if(iptr->ip_src.s_addr < iptr->ip_dst.s_addr) {
ap.src = iptr->ip_src;
ap.dst = iptr->ip_dst;
}
else {
ap.src = iptr->ip_dst;
ap.dst = iptr->ip_src;
}
/* Add the address to be resolved */
resolve(&iptr->ip_dst, NULL, 0);
@@ -184,7 +188,7 @@ void packet_loop(void* ptr) {
resolver_initialise();
/* Open non-promiscuous since this is intended to be run on a router. */
pd = pcap_open_live(interface, CAPTURE_LENGTH, 0, 1000, errbuf);
pd = pcap_open_live(interface, CAPTURE_LENGTH, promiscuous, 1000, errbuf);
if(pd == NULL) {
fprintf(stderr, "pcap_open_live(%s): %s\n", interface, errbuf);
foad = 1;
@@ -222,6 +226,8 @@ void usage(FILE *fp) {
" -i interface listen on named interface (default: eth0)\n"
" -f filter code use filter code to select packets to count\n"
" (default: none, but only IP packets are counted)\n"
" -p run in promiscuous mode (show traffic between other\n"
" hosts on the same network segment)\n"
" -h display this message\n"
"\n"
"iftop, $Id$\n"
@@ -230,7 +236,7 @@ void usage(FILE *fp) {
/* main:
* Entry point. See usage(). */
char optstr[] = "+i:f:dh";
char optstr[] = "+i:f:dhp";
int main(int argc, char **argv) {
pthread_t thread;
struct sigaction sa = {0};
@@ -256,6 +262,10 @@ int main(int argc, char **argv) {
filtercode = optarg;
break;
case 'p':
promiscuous = 1;
break;
case '?':
fprintf(stderr, "iftop: unknown option -%c\n", optopt);
usage(stderr);