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https://github.com/ep00ch/lwip-contrib-mac.git
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71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
#include "pcap_helper.h"
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#define WIN32_LEAN_AND_MEAN
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/* get the windows definitions of the following 4 functions out of the way */
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#include <stdlib.h>
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#include <stdio.h>
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#define HAVE_REMOTE
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#include "pcap.h"
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/** Get the index of an adapter by its network address
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*
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* @param netaddr network address of the adapter (e.g. 192.168.1.0)
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* @return index of the adapter or negative on error
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*/
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int
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get_adapter_index_from_addr(struct in_addr *netaddr, char *guid, size_t guid_len)
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{
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pcap_if_t *alldevs;
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pcap_if_t *d;
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char errbuf[PCAP_ERRBUF_SIZE+1];
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char source[] = "rpcap://";
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int index = 0;
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memset(guid, 0, guid_len);
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memset(errbuf, 0, sizeof(errbuf));
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/* Retrieve the interfaces list */
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if (pcap_findalldevs_ex(source, NULL, &alldevs, errbuf) == -1) {
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printf("Error in pcap_findalldevs: %s\n", errbuf);
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return -1;
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}
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/* Scan the list printing every entry */
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for (d = alldevs; d != NULL; d = d->next, index++) {
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pcap_addr_t *a;
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for(a = d->addresses; a != NULL; a = a->next) {
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if (a->addr->sa_family == AF_INET) {
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ULONG a_addr = ((struct sockaddr_in *)a->addr)->sin_addr.s_addr;
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ULONG a_netmask = ((struct sockaddr_in *)a->netmask)->sin_addr.s_addr;
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ULONG a_netaddr = a_addr & a_netmask;
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ULONG addr = (*netaddr).s_addr;
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if (a_netaddr == addr) {
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int ret = -1;
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char name[128];
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char *start, *end;
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size_t len = strlen(d->name);
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if(len > 127) {
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len = 127;
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}
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memcpy(name, d->name, len);
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name[len] = 0;
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start = strstr(name, "{");
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if (start != NULL) {
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end = strstr(start, "}");
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if (end != NULL) {
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size_t len = end - start + 1;
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memcpy(guid, start, len);
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ret = index;
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}
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}
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pcap_freealldevs(alldevs);
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return ret;
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}
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}
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}
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}
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printf("Network address not found.\n");
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pcap_freealldevs(alldevs);
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return -1;
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}
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