trygetif.c revision 1.5 1 /* $NetBSD: trygetif.c,v 1.5 2002/07/14 00:26:18 wiz Exp $ */
2
3 #include <sys/cdefs.h>
4 #ifndef lint
5 __RCSID("$NetBSD: trygetif.c,v 1.5 2002/07/14 00:26:18 wiz Exp $");
6 #endif
7
8 /*
9 * trygetif.c - test program for getif.c
10 */
11
12 #include <sys/types.h>
13 #include <sys/socket.h>
14
15 #if defined(SUNOS) || defined(SVR4)
16 #include <sys/sockio.h>
17 #endif
18
19 #include <net/if.h> /* for struct ifreq */
20 #include <netinet/in.h>
21 #include <arpa/inet.h> /* inet_ntoa */
22
23 #include <netdb.h>
24 #include <stdio.h>
25 #include <ctype.h>
26 #include <errno.h>
27
28 #include "getif.h"
29
30 int debug = 0;
31 char *progname;
32
33 int
34 main(int argc, char **argv)
35 {
36 struct hostent *hep;
37 struct sockaddr ea; /* Ethernet address */
38 struct sockaddr_in *sip; /* Interface address */
39 struct ifreq *ifr;
40 struct in_addr dst_addr;
41 struct in_addr *dap;
42 int i, s;
43
44 progname = argv[0]; /* for report */
45
46 dap = NULL;
47 if (argc > 1) {
48 dap = &dst_addr;
49 if (inet_aton(argv[1], &dst_addr) == 0) {
50 hep = gethostbyname(argv[1]);
51 if (!hep) {
52 printf("gethostbyname(%s)\n", argv[1]);
53 exit(1);
54 }
55 memcpy(&dst_addr, hep->h_addr, sizeof(dst_addr));
56 }
57 }
58 s = socket(AF_INET, SOCK_DGRAM, 0);
59 if (s < 0) {
60 perror("socket open");
61 exit(1);
62 }
63 ifr = getif(s, dap);
64 if (!ifr) {
65 printf("no interface for address\n");
66 exit(1);
67 }
68 printf("Intf-name:%s\n", ifr->ifr_name);
69 sip = (struct sockaddr_in *) &(ifr->ifr_addr);
70 printf("Intf-addr:%s\n", inet_ntoa(sip->sin_addr));
71
72 exit(0);
73 }
74