1 #ifdef HAVE_CONFIG_H 2 #include "config.h" 3 #endif 4 5 #include <stdlib.h> 6 #include <sys/types.h> 7 #ifdef _WIN32 8 #include <winsock2.h> 9 #else 10 #include <sys/socket.h> 11 #include <netinet/in.h> 12 #include <arpa/inet.h> 13 #include <netdb.h> 14 #endif 15 16 #include <pcap.h> 17 18 static int ifprint(pcap_if_t *d); 19 static char *iptos(bpf_u_int32 in); 20 21 int main(int argc, char **argv) 22 { 23 pcap_if_t *alldevs; 24 pcap_if_t *d; 25 char *s; 26 bpf_u_int32 net, mask; 27 int exit_status = 0; 28 29 char errbuf[PCAP_ERRBUF_SIZE+1]; 30 if (pcap_findalldevs(&alldevs, errbuf) == -1) 31 { 32 fprintf(stderr,"Error in pcap_findalldevs: %s\n",errbuf); 33 exit(1); 34 } 35 for(d=alldevs;d;d=d->next) 36 { 37 if (!ifprint(d)) 38 exit_status = 2; 39 } 40 41 if ( (s = pcap_lookupdev(errbuf)) == NULL) 42 { 43 fprintf(stderr,"Error in pcap_lookupdev: %s\n",errbuf); 44 exit_status = 2; 45 } 46 else 47 { 48 printf("Preferred device name: %s\n",s); 49 } 50 51 if (pcap_lookupnet(s, &net, &mask, errbuf) < 0) 52 { 53 fprintf(stderr,"Error in pcap_lookupnet: %s\n",errbuf); 54 exit_status = 2; 55 } 56 else 57 { 58 printf("Preferred device is on network: %s/%s\n",iptos(net), iptos(mask)); 59 } 60 61 exit(exit_status); 62 } 63 64 static int ifprint(pcap_if_t *d) 65 { 66 pcap_addr_t *a; 67 #ifdef INET6 68 char ntop_buf[INET6_ADDRSTRLEN]; 69 #endif 70 const char *sep; 71 int status = 1; /* success */ 72 73 printf("%s\n",d->name); 74 if (d->description) 75 printf("\tDescription: %s\n",d->description); 76 printf("\tFlags: "); 77 sep = ""; 78 if (d->flags & PCAP_IF_UP) { 79 printf("%sUP", sep); 80 sep = ", "; 81 } 82 if (d->flags & PCAP_IF_RUNNING) { 83 printf("%sRUNNING", sep); 84 sep = ", "; 85 } 86 if (d->flags & PCAP_IF_LOOPBACK) { 87 printf("%sLOOPBACK", sep); 88 sep = ", "; 89 } 90 printf("\n"); 91 92 for(a=d->addresses;a;a=a->next) { 93 if (a->addr != NULL) 94 switch(a->addr->sa_family) { 95 case AF_INET: 96 printf("\tAddress Family: AF_INET\n"); 97 if (a->addr) 98 printf("\t\tAddress: %s\n", 99 inet_ntoa(((struct sockaddr_in *)(a->addr))->sin_addr)); 100 if (a->netmask) 101 printf("\t\tNetmask: %s\n", 102 inet_ntoa(((struct sockaddr_in *)(a->netmask))->sin_addr)); 103 if (a->broadaddr) 104 printf("\t\tBroadcast Address: %s\n", 105 inet_ntoa(((struct sockaddr_in *)(a->broadaddr))->sin_addr)); 106 if (a->dstaddr) 107 printf("\t\tDestination Address: %s\n", 108 inet_ntoa(((struct sockaddr_in *)(a->dstaddr))->sin_addr)); 109 break; 110 #ifdef INET6 111 case AF_INET6: 112 printf("\tAddress Family: AF_INET6\n"); 113 if (a->addr) 114 printf("\t\tAddress: %s\n", 115 inet_ntop(AF_INET6, 116 ((struct sockaddr_in6 *)(a->addr))->sin6_addr.s6_addr, 117 ntop_buf, sizeof ntop_buf)); 118 if (a->netmask) 119 printf("\t\tNetmask: %s\n", 120 inet_ntop(AF_INET6, 121 ((struct sockaddr_in6 *)(a->netmask))->sin6_addr.s6_addr, 122 ntop_buf, sizeof ntop_buf)); 123 if (a->broadaddr) 124 printf("\t\tBroadcast Address: %s\n", 125 inet_ntop(AF_INET6, 126 ((struct sockaddr_in6 *)(a->broadaddr))->sin6_addr.s6_addr, 127 ntop_buf, sizeof ntop_buf)); 128 if (a->dstaddr) 129 printf("\t\tDestination Address: %s\n", 130 inet_ntop(AF_INET6, 131 ((struct sockaddr_in6 *)(a->dstaddr))->sin6_addr.s6_addr, 132 ntop_buf, sizeof ntop_buf)); 133 break; 134 #endif 135 default: 136 printf("\tAddress Family: Unknown (%d)\n", a->addr->sa_family); 137 break; 138 } 139 else 140 { 141 fprintf(stderr, "\tWarning: a->addr is NULL, skipping this address.\n"); 142 status = 0; 143 } 144 } 145 printf("\n"); 146 return status; 147 } 148 149 /* From tcptraceroute */ 150 #define IPTOSBUFFERS 12 151 static char *iptos(bpf_u_int32 in) 152 { 153 static char output[IPTOSBUFFERS][3*4+3+1]; 154 static short which; 155 u_char *p; 156 157 p = (u_char *)∈ 158 which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1); 159 sprintf(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]); 160 return output[which]; 161 } 162
