The Tcpdump Group git mirrors - libpcap/blob - tests/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 int 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   int exit_status = 0;
  24
  25   char errbuf[PCAP_ERRBUF_SIZE+1];
  26   if (pcap_findalldevs(&alldevs, errbuf) == -1)
  27   {
  28     fprintf(stderr,"Error in pcap_findalldevs: %s\n",errbuf);
  29     exit(1);
  30   }
  31   for(d=alldevs;d;d=d->next)
  32   {
  33     if (!ifprint(d))
  34       exit_status = 2;
  35   }
  36
  37   if ( (s = pcap_lookupdev(errbuf)) == NULL)
  38   {
  39     fprintf(stderr,"Error in pcap_lookupdev: %s\n",errbuf);
  40     exit_status = 2;
  41   }
  42   else
  43   {
  44     printf("Preferred device name: %s\n",s);
  45   }
  46
  47   if (pcap_lookupnet(s, &net, &mask, errbuf) < 0)
  48   {
  49     fprintf(stderr,"Error in pcap_lookupnet: %s\n",errbuf);
  50     exit_status = 2;
  51   }
  52   else
  53   {
  54     printf("Preferred device is on network: %s/%s\n",iptos(net), iptos(mask));
  55   }
  56
  57   exit(exit_status);
  58 }
  59
  60 static int ifprint(pcap_if_t *d)
  61 {
  62   pcap_addr_t *a;
  63 #ifdef INET6
  64   char ntop_buf[INET6_ADDRSTRLEN];
  65 #endif
  66   int status = 1; /* success */
  67
  68   printf("%s\n",d->name);
  69   if (d->description)
  70     printf("\tDescription: %s\n",d->description);
  71   printf("\tLoopback: %s\n",(d->flags & PCAP_IF_LOOPBACK)?"yes":"no");
  72
  73   for(a=d->addresses;a;a=a->next) {
  74     if (a->addr != NULL)
  75       switch(a->addr->sa_family) {
  76       case AF_INET:
  77         printf("\tAddress Family: AF_INET\n");
  78         if (a->addr)
  79           printf("\t\tAddress: %s\n",
  80             inet_ntoa(((struct sockaddr_in *)(a->addr))->sin_addr));
  81         if (a->netmask)
  82           printf("\t\tNetmask: %s\n",
  83             inet_ntoa(((struct sockaddr_in *)(a->netmask))->sin_addr));
  84         if (a->broadaddr)
  85           printf("\t\tBroadcast Address: %s\n",
  86             inet_ntoa(((struct sockaddr_in *)(a->broadaddr))->sin_addr));
  87         if (a->dstaddr)
  88           printf("\t\tDestination Address: %s\n",
  89             inet_ntoa(((struct sockaddr_in *)(a->dstaddr))->sin_addr));
  90         break;
  91 #ifdef INET6
  92       case AF_INET6:
  93         printf("\tAddress Family: AF_INET6\n");
  94         if (a->addr)
  95           printf("\t\tAddress: %s\n",
  96             inet_ntop(AF_INET6,
  97                ((struct sockaddr_in6 *)(a->addr))->sin6_addr.s6_addr,
  98                ntop_buf, sizeof ntop_buf));
  99         if (a->netmask)
 100           printf("\t\tNetmask: %s\n",
 101             inet_ntop(AF_INET6,
 102               ((struct sockaddr_in6 *)(a->netmask))->sin6_addr.s6_addr,
 103                ntop_buf, sizeof ntop_buf));
 104         if (a->broadaddr)
 105           printf("\t\tBroadcast Address: %s\n",
 106             inet_ntop(AF_INET6,
 107               ((struct sockaddr_in6 *)(a->broadaddr))->sin6_addr.s6_addr,
 108                ntop_buf, sizeof ntop_buf));
 109         if (a->dstaddr)
 110           printf("\t\tDestination Address: %s\n",
 111             inet_ntop(AF_INET6,
 112               ((struct sockaddr_in6 *)(a->dstaddr))->sin6_addr.s6_addr,
 113                ntop_buf, sizeof ntop_buf));
 114         break;
 115 #endif
 116       default:
 117         printf("\tAddress Family: Unknown (%d)\n", a->addr->sa_family);
 118         break;
 119       }
 120     else
 121     {
 122       fprintf(stderr, "\tWarning: a->addr is NULL, skipping this address.\n");
 123       status = 0;
 124     }
 125   }
 126   printf("\n");
 127   return status;
 128 }
 129
 130 /* From tcptraceroute */
 131 #define IPTOSBUFFERS    12
 132 static char *iptos(bpf_u_int32 in)
 133 {
 134         static char output[IPTOSBUFFERS][3*4+3+1];
 135         static short which;
 136         u_char *p;
 137
 138         p = (u_char *)&in;
 139         which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1);
 140         sprintf(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
 141         return output[which];
 142 }