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
main(int argc,char ** argv)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
ifprint(pcap_if_t * d)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
iptos(bpf_u_int32 in)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