trygetif.c revision 1.1 1 /*
2 * trygetif.c - test program for getif.c
3 */
4
5 #include <sys/types.h>
6 #include <sys/socket.h>
7
8 #if defined(SUNOS) || defined(SVR4)
9 #include <sys/sockio.h>
10 #endif
11
12 #include <net/if.h> /* for struct ifreq */
13 #include <netinet/in.h>
14 #include <arpa/inet.h> /* inet_ntoa */
15
16 #include <netdb.h>
17 #include <stdio.h>
18 #include <ctype.h>
19 #include <errno.h>
20
21 #include "getif.h"
22
23 int debug = 0;
24 char *progname;
25
26 main(argc, argv)
27 char **argv;
28 {
29 struct hostent *hep;
30 struct sockaddr ea; /* Ethernet address */
31 struct sockaddr_in *sip; /* Interface address */
32 struct ifreq *ifr;
33 struct in_addr dst_addr;
34 struct in_addr *dap;
35 int i, s;
36
37 progname = argv[0]; /* for report */
38
39 dap = NULL;
40 if (argc > 1) {
41 dap = &dst_addr;
42 if (isdigit(argv[1][0]))
43 dst_addr.s_addr = inet_addr(argv[1]);
44 else {
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