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
18static int ifprint(pcap_if_t *d);
19static char *iptos(bpf_u_int32 in);
20
21int 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
64static 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
151static 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 *)&in;
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