1 /* $NetBSD: trygetif.c,v 1.4 1998/03/14 04:39:55 lukem Exp $ */ 2 3 #include <sys/cdefs.h> 4 #ifndef lint 5 __RCSID("$NetBSD: trygetif.c,v 1.4 1998/03/14 04:39:55 lukem 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 main(argc, argv) 34 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