132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <pcap.h>
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static void ifprint(pcap_if_t *d);
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static char *iptos(bpf_u_int32 in);
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int main(int argc, char **argv)
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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 *s;
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bpf_u_int32 net, mask;
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char errbuf[PCAP_ERRBUF_SIZE+1];
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if (pcap_findalldevs(&alldevs, errbuf) == -1)
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{
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fprintf(stderr,"Error in pcap_findalldevs: %s\n",errbuf);
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exit(1);
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}
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for(d=alldevs;d;d=d->next)
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{
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ifprint(d);
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}
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if ( (s = pcap_lookupdev(errbuf)) == NULL)
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{
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fprintf(stderr,"Error in pcap_lookupdev: %s\n",errbuf);
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}
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else
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{
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printf("Preferred device name: %s\n",s);
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}
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if (pcap_lookupnet(s, &net, &mask, errbuf) < 0)
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{
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fprintf(stderr,"Error in pcap_lookupnet: %s\n",errbuf);
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}
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else
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{
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printf("Preferred device is on network: %s/%s\n",iptos(net), iptos(mask));
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}
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exit(0);
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}
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static void ifprint(pcap_if_t *d)
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{
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pcap_addr_t *a;
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#ifdef INET6
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char ntop_buf[INET6_ADDRSTRLEN];
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#endif
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printf("%s\n",d->name);
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if (d->description)
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printf("\tDescription: %s\n",d->description);
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printf("\tLoopback: %s\n",(d->flags & PCAP_IF_LOOPBACK)?"yes":"no");
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for(a=d->addresses;a;a=a->next) {
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switch(a->addr->sa_family)
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{
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case AF_INET:
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printf("\tAddress Family: AF_INET\n");
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if (a->addr)
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printf("\t\tAddress: %s\n",
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inet_ntoa(((struct sockaddr_in *)(a->addr))->sin_addr));
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if (a->netmask)
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printf("\t\tNetmask: %s\n",
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inet_ntoa(((struct sockaddr_in *)(a->netmask))->sin_addr));
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if (a->broadaddr)
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printf("\t\tBroadcast Address: %s\n",
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inet_ntoa(((struct sockaddr_in *)(a->broadaddr))->sin_addr));
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if (a->dstaddr)
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printf("\t\tDestination Address: %s\n",
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inet_ntoa(((struct sockaddr_in *)(a->dstaddr))->sin_addr));
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break;
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#ifdef INET6
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case AF_INET6:
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printf("\tAddress Family: AF_INET6\n");
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if (a->addr)
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printf("\t\tAddress: %s\n",
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inet_ntop(AF_INET6,
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((struct sockaddr_in6 *)(a->addr))->sin6_addr.s6_addr,
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ntop_buf, sizeof ntop_buf));
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if (a->netmask)
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printf("\t\tNetmask: %s\n",
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inet_ntop(AF_INET6,
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((struct sockaddr_in6 *)(a->netmask))->sin6_addr.s6_addr,
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ntop_buf, sizeof ntop_buf));
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if (a->broadaddr)
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printf("\t\tBroadcast Address: %s\n",
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inet_ntop(AF_INET6,
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((struct sockaddr_in6 *)(a->broadaddr))->sin6_addr.s6_addr,
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ntop_buf, sizeof ntop_buf));
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if (a->dstaddr)
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printf("\t\tDestination Address: %s\n",
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inet_ntop(AF_INET6,
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((struct sockaddr_in6 *)(a->dstaddr))->sin6_addr.s6_addr,
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ntop_buf, sizeof ntop_buf));
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break;
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#endif
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default:
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printf("\tAddress Family: Unknown (%d)\n", a->addr->sa_family);
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break;
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}
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}
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printf("\n");
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}
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/* From tcptraceroute */
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#define IPTOSBUFFERS 12
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static char *iptos(bpf_u_int32 in)
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{
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static char output[IPTOSBUFFERS][3*4+3+1];
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static short which;
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u_char *p;
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p = (u_char *)∈
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which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1);
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sprintf(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
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return output[which];
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}
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