/* $NetBSD: trygetif.c,v 1.6 2007/03/10 00:16:51 hubertf Exp $ */ #include <sys/cdefs.h> #ifndef lint __RCSID("$NetBSD: trygetif.c,v 1.6 2007/03/10 00:16:51 hubertf Exp $"); #endif /* * trygetif.c - test program for getif.c */ #include <sys/types.h> #include <sys/socket.h> #if defined(SUNOS) || defined(SVR4) #include <sys/sockio.h> #endif #include <net/if.h> /* for struct ifreq */ #include <netinet/in.h> #include <arpa/inet.h> /* inet_ntoa */ #include <netdb.h> #include <stdio.h> #include <errno.h> #include "getif.h" int main(int argc, char **argv) { struct hostent *hep; struct sockaddr ea; /* Ethernet address */ struct sockaddr_in *sip; /* Interface address */ struct ifreq *ifr; struct in_addr dst_addr; struct in_addr *dap; int i, s; dap = NULL; if (argc > 1) { dap = &dst_addr; if (inet_aton(argv[1], &dst_addr) == 0) { hep = gethostbyname(argv[1]); if (!hep) { fprintf(stderr, "gethostbyname(%s)\n", argv[1]); exit(1); } memcpy(&dst_addr, hep->h_addr, sizeof(dst_addr)); } } s = socket(AF_INET, SOCK_DGRAM, 0); if (s < 0) { perror("socket open"); exit(1); } ifr = getif(s, dap); if (!ifr) { fprintf(stderr, "no interface for address\n"); exit(1); } printf("Intf-name:%s\n", ifr->ifr_name); sip = (struct sockaddr_in *) &(ifr->ifr_addr); printf("Intf-addr:%s\n", inet_ntoa(sip->sin_addr)); return 0; }