/* Capture packets from the network, and print them. */
static int
start_cap(char *dev)
{
char temp[PCAP_ERRBUF_SIZE];
struct pcap_pkthdr *hdr;
const unsigned char *pkt;
struct tm *ltime;
time_t now;
pcap_t *pcap;
int rc;
/* Open the device for reading from it. */
pcap = f_pcap_open_live(dev,
1518, /* MTU */
1, /* promisc mode */
10, /* timeout */
temp);
if (pcap == NULL) {
fprintf(stderr, "Pcap: open_live(%s): %s\n", dev, temp);
return(2);
}
printf("Listening on '%s'..\n", dev);
for (;;) {
rc = f_pcap_next_ex(pcap, &hdr, &pkt);
if (rc < 0) break;
/* Did we time out? */
if (rc == 0) continue;
/* Convert the timestamp to readable format. */
now = hdr->ts.tv_sec;
ltime = localtime(&now);
strftime(temp, sizeof(temp), "%H:%M:%S", ltime);
/* Process and print the packet. */
printf("\n<< %s,%.6ld len=%u\n",
temp, hdr->ts.tv_usec, hdr->len);
rc = eth_prhdr((unsigned char *)pkt);
hex_dump((unsigned char *)pkt+rc, hdr->len-rc);
}
/* All done, close up. */
f_pcap_close(pcap);
return(0);
}
/* Initialize WinPcap for us. */
int
network_pcap_setup(uint8_t *mac, NETRXCB func, void *arg)
{
char temp[PCAP_ERRBUF_SIZE];
char filter_exp[255];
struct bpf_program fp;
char *dev;
/* Did we already load the DLL? */
if (pcap_handle == NULL) return(-1);
#if 1
/* Get the value of our capture interface. */
dev = network_pcap;
if (dev == NULL) {
pclog(" PCap device is a null pointer!\n");
return(-1);
}
if ((dev[0] == '\0') || !strcmp(dev, "none")) {
pclog(" No network device configured!\n");
return(-1);
}
pclog(" Network interface: '%s'\n", dev);
#endif
strcpy(temp, f_pcap_lib_version());
dev = strchr(temp, '(');
if (dev != NULL) *(dev-1) = '\0';
pclog("PCAP: initializing, %s\n", temp);
#if 0
/* Get the value of our capture interface. */
dev = network_pcap;
if ((dev[0] == '\0') || !strcmp(dev, "none")) {
pclog(" No network device configured!\n");
return(-1);
}
pclog(" Network interface: '%s'\n", dev);
#else
dev = network_pcap;
#endif
pcap = f_pcap_open_live(dev, /* interface name */
1518, /* maximum packet size */
1, /* promiscuous mode? */
10, /* timeout in msec */
temp); /* error buffer */
if (pcap == NULL) {
pclog(" Unable to open device: %s!\n", temp);
return(-1);
}
/* Create a MAC address based packet filter. */
pclog(" Installing packet filter for MAC=%02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
sprintf(filter_exp,
"( ((ether dst ff:ff:ff:ff:ff:ff) or (ether dst %02x:%02x:%02x:%02x:%02x:%02x)) and not (ether src %02x:%02x:%02x:%02x:%02x:%02x) )",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5],
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
if (f_pcap_compile(pcap, &fp, filter_exp, 0, 0xffffffff) != -1) {
if (f_pcap_setfilter(pcap, &fp) == -1)
pclog(" Error installing filter (%s) !\n", filter_exp);
} else {
pclog(" Could not compile filter (%s) !\n", filter_exp);
}
/* Save the callback info. */
poll_rx = func;
poll_arg = arg;
pclog(" Starting thread..\n");
poll_tid = thread_create(poll_thread, mac);
return(0);
}
