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 #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   int status = 1; /* success */
  71
  72   printf("%s\n",d->name);
  73   if (d->description)
  74     printf("\tDescription: %s\n",d->description);
  75   printf("\tLoopback: %s\n",(d->flags & PCAP_IF_LOOPBACK)?"yes":"no");
  76
  77   for(a=d->addresses;a;a=a->next) {
  78     if (a->addr != NULL)
  79       switch(a->addr->sa_family) {
  80       case AF_INET:
  81         printf("\tAddress Family: AF_INET\n");
  82         if (a->addr)
  83           printf("\t\tAddress: %s\n",
  84             inet_ntoa(((struct sockaddr_in *)(a->addr))->sin_addr));
  85         if (a->netmask)
  86           printf("\t\tNetmask: %s\n",
  87             inet_ntoa(((struct sockaddr_in *)(a->netmask))->sin_addr));
  88         if (a->broadaddr)
  89           printf("\t\tBroadcast Address: %s\n",
  90             inet_ntoa(((struct sockaddr_in *)(a->broadaddr))->sin_addr));
  91         if (a->dstaddr)
  92           printf("\t\tDestination Address: %s\n",
  93             inet_ntoa(((struct sockaddr_in *)(a->dstaddr))->sin_addr));
  94         break;
  95 #ifdef INET6
  96       case AF_INET6:
  97         printf("\tAddress Family: AF_INET6\n");
  98         if (a->addr)
  99           printf("\t\tAddress: %s\n",
 100             inet_ntop(AF_INET6,
 101                ((struct sockaddr_in6 *)(a->addr))->sin6_addr.s6_addr,
 102                ntop_buf, sizeof ntop_buf));
 103         if (a->netmask)
 104           printf("\t\tNetmask: %s\n",
 105             inet_ntop(AF_INET6,
 106               ((struct sockaddr_in6 *)(a->netmask))->sin6_addr.s6_addr,
 107                ntop_buf, sizeof ntop_buf));
 108         if (a->broadaddr)
 109           printf("\t\tBroadcast Address: %s\n",
 110             inet_ntop(AF_INET6,
 111               ((struct sockaddr_in6 *)(a->broadaddr))->sin6_addr.s6_addr,
 112                ntop_buf, sizeof ntop_buf));
 113         if (a->dstaddr)
 114           printf("\t\tDestination Address: %s\n",
 115             inet_ntop(AF_INET6,
 116               ((struct sockaddr_in6 *)(a->dstaddr))->sin6_addr.s6_addr,
 117                ntop_buf, sizeof ntop_buf));
 118         break;
 119 #endif
 120       default:
 121         printf("\tAddress Family: Unknown (%d)\n", a->addr->sa_family);
 122         break;
 123       }
 124     else
 125     {
 126       fprintf(stderr, "\tWarning: a->addr is NULL, skipping this address.\n");
 127       status = 0;
 128     }
 129   }
 130   printf("\n");
 131   return status;
 132 }
 133
 134 /* From tcptraceroute */
 135 #define IPTOSBUFFERS    12
 136 static char *iptos(bpf_u_int32 in)
 137 {
 138         static char output[IPTOSBUFFERS][3*4+3+1];
 139         static short which;
 140         u_char *p;
 141
 142         p = (u_char *)&in;
 143         which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1);
 144         sprintf(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
 145         return output[which];
 146 }