1 #ifdef HAVE_CONFIG_H 2 #include "config.h" 3 #endif 4 5 #include <stdlib.h> 6 #include <sys/types.h> 7 #include <sys/socket.h> 8 #include <netinet/in.h> 9 #include <arpa/inet.h> 10 #include <netdb.h> 11 12 #include <pcap.h> 13 14 static void ifprint(pcap_if_t *d); 15 static char *iptos(bpf_u_int32 in); 16 17 int main(int argc, char **argv) 18 { 19 pcap_if_t *alldevs; 20 pcap_if_t *d; 21 char *s; 22 bpf_u_int32 net, mask; 23 24 char errbuf[PCAP_ERRBUF_SIZE+1]; 25 if (pcap_findalldevs(&alldevs, errbuf) == -1) 26 { 27 fprintf(stderr,"Error in pcap_findalldevs: %s\n",errbuf); 28 exit(1); 29 } 30 for(d=alldevs;d;d=d->next) 31 { 32 ifprint(d); 33 } 34 35 if ( (s = pcap_lookupdev(errbuf)) == NULL) 36 { 37 fprintf(stderr,"Error in pcap_lookupdev: %s\n",errbuf); 38 } 39 else 40 { 41 printf("Preferred device name: %s\n",s); 42 } 43 44 if (pcap_lookupnet(s, &net, &mask, errbuf) < 0) 45 { 46 fprintf(stderr,"Error in pcap_lookupnet: %s\n",errbuf); 47 } 48 else 49 { 50 printf("Preferred device is on network: %s/%s\n",iptos(net), iptos(mask)); 51 } 52 53 exit(0); 54 } 55 56 static void ifprint(pcap_if_t *d) 57 { 58 pcap_addr_t *a; 59 #ifdef INET6 60 char ntop_buf[INET6_ADDRSTRLEN]; 61 #endif 62 63 printf("%s\n",d->name); 64 if (d->description) 65 printf("\tDescription: %s\n",d->description); 66 printf("\tLoopback: %s\n",(d->flags & PCAP_IF_LOOPBACK)?"yes":"no"); 67 68 for(a=d->addresses;a;a=a->next) { 69 switch(a->addr->sa_family) 70 { 71 case AF_INET: 72 printf("\tAddress Family: AF_INET\n"); 73 if (a->addr) 74 printf("\t\tAddress: %s\n", 75 inet_ntoa(((struct sockaddr_in *)(a->addr))->sin_addr)); 76 if (a->netmask) 77 printf("\t\tNetmask: %s\n", 78 inet_ntoa(((struct sockaddr_in *)(a->netmask))->sin_addr)); 79 if (a->broadaddr) 80 printf("\t\tBroadcast Address: %s\n", 81 inet_ntoa(((struct sockaddr_in *)(a->broadaddr))->sin_addr)); 82 if (a->dstaddr) 83 printf("\t\tDestination Address: %s\n", 84 inet_ntoa(((struct sockaddr_in *)(a->dstaddr))->sin_addr)); 85 break; 86 #ifdef INET6 87 case AF_INET6: 88 printf("\tAddress Family: AF_INET6\n"); 89 if (a->addr) 90 printf("\t\tAddress: %s\n", 91 inet_ntop(AF_INET6, 92 ((struct sockaddr_in6 *)(a->addr))->sin6_addr.s6_addr, 93 ntop_buf, sizeof ntop_buf)); 94 if (a->netmask) 95 printf("\t\tNetmask: %s\n", 96 inet_ntop(AF_INET6, 97 ((struct sockaddr_in6 *)(a->netmask))->sin6_addr.s6_addr, 98 ntop_buf, sizeof ntop_buf)); 99 if (a->broadaddr) 100 printf("\t\tBroadcast Address: %s\n", 101 inet_ntop(AF_INET6, 102 ((struct sockaddr_in6 *)(a->broadaddr))->sin6_addr.s6_addr, 103 ntop_buf, sizeof ntop_buf)); 104 if (a->dstaddr) 105 printf("\t\tDestination Address: %s\n", 106 inet_ntop(AF_INET6, 107 ((struct sockaddr_in6 *)(a->dstaddr))->sin6_addr.s6_addr, 108 ntop_buf, sizeof ntop_buf)); 109 break; 110 #endif 111 default: 112 printf("\tAddress Family: Unknown (%d)\n", a->addr->sa_family); 113 break; 114 } 115 } 116 printf("\n"); 117 } 118 119 /* From tcptraceroute */ 120 #define IPTOSBUFFERS 12 121 static char *iptos(bpf_u_int32 in) 122 { 123 static char output[IPTOSBUFFERS][3*4+3+1]; 124 static short which; 125 u_char *p; 126 127 p = (u_char *)∈ 128 which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1); 129 sprintf(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]); 130 return output[which]; 131 } 132
