1 /* 2 * trygetif.c - test program for getif.c 3 * 4 * $FreeBSD$ 5 */ 6 7 #include <sys/types.h> 8 #include <sys/socket.h> 9 10 #if defined(SUNOS) || defined(SVR4) 11 #include <sys/sockio.h> 12 #endif 13 14 #ifdef _AIX32 15 #include <sys/time.h> /* for struct timeval in net/if.h */ 16 #endif 17 #include <net/if.h> /* for struct ifreq */ 18 #include <netinet/in.h> 19 #include <arpa/inet.h> /* inet_ntoa */ 20 21 #include <netdb.h> 22 #include <stdio.h> 23 #include <ctype.h> 24 #include <errno.h> 25 26 #include "getif.h" 27 28 int debug = 0; 29 char *progname; 30 31 void 32 main(argc, argv) 33 int argc; 34 char **argv; 35 { 36 struct hostent *hep; 37 struct sockaddr_in *sip; /* Interface address */ 38 struct ifreq *ifr; 39 struct in_addr dst_addr; 40 struct in_addr *dap; 41 int s; 42 43 progname = argv[0]; /* for report */ 44 45 dap = NULL; 46 if (argc > 1) { 47 dap = &dst_addr; 48 if (isdigit(argv[1][0])) 49 dst_addr.s_addr = inet_addr(argv[1]); 50 else { 51 hep = gethostbyname(argv[1]); 52 if (!hep) { 53 printf("gethostbyname(%s)\n", argv[1]); 54 exit(1); 55 } 56 memcpy(&dst_addr, hep->h_addr, sizeof(dst_addr)); 57 } 58 } 59 s = socket(AF_INET, SOCK_DGRAM, 0); 60 if (s < 0) { 61 perror("socket open"); 62 exit(1); 63 } 64 ifr = getif(s, dap); 65 if (!ifr) { 66 printf("no interface for address\n"); 67 exit(1); 68 } 69 printf("Intf-name:%s\n", ifr->ifr_name); 70 sip = (struct sockaddr_in *) &(ifr->ifr_addr); 71 printf("Intf-addr:%s\n", inet_ntoa(sip->sin_addr)); 72 73 exit(0); 74 } 75