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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _WIN32
#include <Windows.h>
#else
#include <unistd.h>
#endif
/* If you are building x64 on Windows with WinPcap change add
* || defined(_WIN64) to #if defined(WIN32) on line 40 */
#include <pcap/pcap.h>
int main(int argc, char **argv)
{
pcap_t *fp;
char* endptr = NULL;
pcap_if_t *alldevs, *d;
int SLEEP_TIME_MS = 10;
long index = -1, num_ifaces = 0;
char errbuf[PCAP_ERRBUF_SIZE + 1];
unsigned char PAUSE_FRAME[60] =
{
0x01, 0x80, 0xC2, 0x00, 0x00, 0x01, /* Destination MAC: Spanning tree for bridges */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* Source MAC: Null */
0x88, 0x08, /* EtherType: MAC control */
0x00, 0x01, /* OpCode: Pause */
0xFF, 0xFF, /* pause_time: 65535 */
/* 42 bytes of padding */
};
if (pcap_findalldevs(&alldevs, errbuf) == -1)
{
fprintf(stderr, "Could not enumerate interfaces: %s\n", errbuf);
return 1;
}
if (argc != 2)
{
long counter = 0;
fprintf(stderr, "Please pass interface name, description, or index on the command line\n\n");
printf("Index\tName Description\n\n");
for (d = alldevs; d; d = d->next)
printf("%ld\t%s %s\n", counter++, d->name, d->description);
return 1;
}
index = strtoul(argv[1], &endptr, 10);
if (!endptr || *endptr != '\0')
index = -1;
for (d = alldevs; d; d = d->next, ++num_ifaces)
{
if (index == -1 &&
((d->description && (strcmp(d->description, argv[1]) == 0))
|| (d->name && (strcmp(d->name, argv[1]) == 0))))
index = num_ifaces;
}
if (index < 0 || index >= num_ifaces)
{
fprintf(stderr, "Could not find interface %s\n", argv[1]);
return 1;
}
d = alldevs;
while (index--)
d = d->next;
if ((fp = pcap_open_live(d->name, 65536, 1, 1000, errbuf)) == NULL)
{
fprintf(stderr, "Unable to open the interface: %s\n", errbuf);
return 1;
}
memset(PAUSE_FRAME + 18, 0, 42); /* fill padding with 00 */
while (1)
{
if (pcap_sendpacket(fp, PAUSE_FRAME, sizeof(PAUSE_FRAME)) != 0)
{
fprintf(stderr, "Error sending frame: %s\n", pcap_geterr(fp));
break;
}
#ifdef _WIN32
Sleep(SLEEP_TIME_MS);
#else
usleep(SLEEP_TIME_MS * 1000);
#endif
}
pcap_close(fp);
return 0;
}