The Tcpdump Group git mirrors - libpcap/blob - findalldevstest.c

   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 *)&in;
 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 }