1 /* $NetBSD: trygetif.c,v 1.6 2007/03/10 00:16:51 hubertf Exp $ */ 2 3 #include <sys/cdefs.h> 4 #ifndef lint 5 __RCSID("$NetBSD: trygetif.c,v 1.6 2007/03/10 00:16:51 hubertf 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 <errno.h> 26 27 #include "getif.h" 28 29 int 30 main(int argc, char **argv) 31 { 32 struct hostent *hep; 33 struct sockaddr ea; /* Ethernet address */ 34 struct sockaddr_in *sip; /* Interface address */ 35 struct ifreq *ifr; 36 struct in_addr dst_addr; 37 struct in_addr *dap; 38 int i, s; 39 40 dap = NULL; 41 if (argc > 1) { 42 dap = &dst_addr; 43 if (inet_aton(argv[1], &dst_addr) == 0) { 44 hep = gethostbyname(argv[1]); 45 if (!hep) { 46 fprintf(stderr, "gethostbyname(%s)\n", argv[1]); 47 exit(1); 48 } 49 memcpy(&dst_addr, hep->h_addr, sizeof(dst_addr)); 50 } 51 } 52 s = socket(AF_INET, SOCK_DGRAM, 0); 53 if (s < 0) { 54 perror("socket open"); 55 exit(1); 56 } 57 ifr = getif(s, dap); 58 if (!ifr) { 59 fprintf(stderr, "no interface for address\n"); 60 exit(1); 61 } 62 printf("Intf-name:%s\n", ifr->ifr_name); 63 sip = (struct sockaddr_in *) &(ifr->ifr_addr); 64 printf("Intf-addr:%s\n", inet_ntoa(sip->sin_addr)); 65 66 return 0; 67 } 68