1 /* $OpenBSD: gethostnamadr.c,v 1.2 2012/07/29 19:51:36 eric Exp $ */ 2 /* 3 * Copyright (c) 2012 Eric Faurot <eric@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 #include <sys/types.h> 18 #include <sys/socket.h> 19 #include <netinet/in.h> 20 #include <arpa/inet.h> 21 22 #include <err.h> 23 #include <errno.h> 24 #include <getopt.h> 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <string.h> 28 29 #include "common.h" 30 31 static void 32 usage(void) 33 { 34 extern const char * __progname; 35 36 fprintf(stderr, "usage: %s [-46e] <host...>\n", __progname); 37 exit(1); 38 } 39 40 int 41 main(int argc, char *argv[]) 42 { 43 int i, ch, aflag, family = AF_INET; 44 struct hostent *h; 45 char *host; 46 char addr[16]; 47 int addrlen; 48 49 aflag = 0; 50 while((ch = getopt(argc, argv, "46ae")) != -1) { 51 switch(ch) { 52 case '4': 53 family = AF_INET; 54 break; 55 case '6': 56 family = AF_INET6; 57 break; 58 case 'a': 59 aflag = 1; 60 break; 61 case 'e': 62 long_err += 1; 63 break; 64 default: 65 usage(); 66 /* NOTREACHED */ 67 } 68 } 69 argc -= optind; 70 argv += optind; 71 72 for(i = 0; i < argc; i++) { 73 74 if (i) 75 printf("\n"); 76 printf("===> \"%s\"\n", argv[i]); 77 host = gethostarg(argv[i]); 78 79 if (aflag && addr_from_str(addr, &family, &addrlen, host) == -1) 80 errx(1, "bad address"); 81 82 errno = 0; 83 h_errno = 0; 84 gai_errno = 0; 85 rrset_errno = 0; 86 87 if (aflag == 0) 88 h = gethostbyname2(host, family); 89 else 90 h = gethostbyaddr(addr, addrlen, family); 91 if (h) 92 print_hostent(h); 93 print_errors(); 94 } 95 96 return (0); 97 } 98 99 int 100 addr_from_str(char *addr, int *family, int *len, const char *src) 101 { 102 if (inet_pton(AF_INET6, src, addr) == 1) { 103 *family = AF_INET6; 104 *len = 16; 105 return (0); 106 } 107 if (inet_pton(AF_INET, src, addr) == 1) { 108 *family = AF_INET; 109 *len = 4; 110 return (0); 111 } 112 return (-1); 113 } 114