trygetif.c revision 1.3 1 /* $NetBSD: trygetif.c,v 1.3 1998/01/09 08:09:17 perry Exp $ */
2
3 /*
4 * trygetif.c - test program for getif.c
5 */
6
7 #include <sys/types.h>
8 #include <sys/socket.h>
9
10 #if defined(SUNOS) || defined(SVR4)
11 #include <sys/sockio.h>
12 #endif
13
14 #include <net/if.h> /* for struct ifreq */
15 #include <netinet/in.h>
16 #include <arpa/inet.h> /* inet_ntoa */
17
18 #include <netdb.h>
19 #include <stdio.h>
20 #include <ctype.h>
21 #include <errno.h>
22
23 #include "getif.h"
24
25 int debug = 0;
26 char *progname;
27
28 main(argc, argv)
29 char **argv;
30 {
31 struct hostent *hep;
32 struct sockaddr ea; /* Ethernet address */
33 struct sockaddr_in *sip; /* Interface address */
34 struct ifreq *ifr;
35 struct in_addr dst_addr;
36 struct in_addr *dap;
37 int i, s;
38
39 progname = argv[0]; /* for report */
40
41 dap = NULL;
42 if (argc > 1) {
43 dap = &dst_addr;
44 if (inet_aton(argv[1], &dst_addr) == 0) {
45 hep = gethostbyname(argv[1]);
46 if (!hep) {
47 printf("gethostbyname(%s)\n", argv[1]);
48 exit(1);
49 }
50 memcpy(&dst_addr, hep->h_addr, sizeof(dst_addr));
51 }
52 }
53 s = socket(AF_INET, SOCK_DGRAM, 0);
54 if (s < 0) {
55 perror("socket open");
56 exit(1);
57 }
58 ifr = getif(s, dap);
59 if (!ifr) {
60 printf("no interface for address\n");
61 exit(1);
62 }
63 printf("Intf-name:%s\n", ifr->ifr_name);
64 sip = (struct sockaddr_in *) &(ifr->ifr_addr);
65 printf("Intf-addr:%s\n", inet_ntoa(sip->sin_addr));
66
67 exit(0);
68 }
69