1 /* $NetBSD: h_hostent.c,v 1.1 2013/08/16 15:29:45 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 #include <sys/cdefs.h> 32 __RCSID("$NetBSD: h_hostent.c,v 1.1 2013/08/16 15:29:45 christos Exp $"); 33 34 #include <stdio.h> 35 #include <string.h> 36 #include <nsswitch.h> 37 #include <netdb.h> 38 #include <stdint.h> 39 #include <stdlib.h> 40 #include <unistd.h> 41 #include <err.h> 42 43 #include <netinet/in.h> 44 #include <sys/types.h> 45 #include <arpa/nameser.h> 46 #include <arpa/inet.h> 47 48 #include "hostent.h" 49 50 static void 51 phostent(const struct hostent *h) 52 { 53 size_t i; 54 char buf[1024]; 55 const int af = h->h_length == NS_INADDRSZ ? AF_INET : AF_INET6; 56 57 printf("name=%s, length=%d, addrtype=%d, aliases=[", 58 h->h_name, h->h_length, h->h_addrtype); 59 60 for (i = 0; h->h_aliases[i]; i++) 61 printf("%s%s", i == 0 ? "" : " ", h->h_aliases[i]); 62 63 printf("] addr_list=["); 64 65 for (i = 0; h->h_addr_list[i]; i++) 66 printf("%s%s", i == 0 ? "" : " ", inet_ntop(af, 67 h->h_addr_list[i], buf, (socklen_t)sizeof(buf))); 68 69 printf("]\n"); 70 } 71 72 static void 73 usage(void) 74 { 75 (void)fprintf(stderr, "Usage: %s [-f <hostsfile>] " 76 "[-t <any|dns|nis|files>] " 77 "[-46a] <name|address>\n", getprogname()); 78 exit(EXIT_FAILURE); 79 } 80 81 static void 82 getby(int (*f)(void *, void *, va_list), struct getnamaddr *info, ...) 83 { 84 va_list ap; 85 int e; 86 87 va_start(ap, info); 88 e = (*f)(info, NULL, ap); 89 va_end(ap); 90 switch (e) { 91 case NS_SUCCESS: 92 phostent(info->hp); 93 break; 94 default: 95 printf("error %d\n", e); 96 break; 97 } 98 } 99 100 static void 101 geta(struct hostent *hp) { 102 if (hp == NULL) 103 printf("error %d\n", h_errno); 104 else 105 phostent(hp); 106 } 107 108 int 109 main(int argc, char *argv[]) 110 { 111 int (*f)(void *, void *, va_list) = NULL; 112 const char *type = "any"; 113 int c, af, e, byaddr, len; 114 struct hostent hent; 115 struct getnamaddr info; 116 char buf[4096]; 117 118 af = AF_INET; 119 byaddr = 0; 120 len = 0; 121 info.hp = &hent; 122 info.buf = buf; 123 info.buflen = sizeof(buf); 124 info.he = &e; 125 126 while ((c = getopt(argc, argv, "46af:t:")) != -1) { 127 switch (c) { 128 case '4': 129 af = AF_INET; 130 break; 131 case '6': 132 af = AF_INET6; 133 break; 134 case 'a': 135 byaddr++; 136 break; 137 case 't': 138 type = optarg; 139 break; 140 case 'f': 141 _hf_sethostsfile(optarg); 142 break; 143 default: 144 usage(); 145 } 146 } 147 148 argc -= optind; 149 argv += optind; 150 151 if (argc != 1) 152 usage(); 153 154 switch (*type) { 155 case 'a': 156 break; 157 case 'd': 158 f = byaddr ? _dns_gethtbyaddr : _dns_gethtbyname; 159 break; 160 #ifdef YP 161 case 'n': 162 f = byaddr ? _yp_gethtbyaddr : _yp_gethtbyname; 163 break; 164 #endif 165 case 'f': 166 f = byaddr ? _hf_gethtbyaddr : _hf_gethtbyname; 167 break; 168 default: 169 errx(EXIT_FAILURE, "Unknown db type `%s'", type); 170 } 171 172 if (byaddr) { 173 struct in6_addr addr; 174 af = strchr(*argv, ':') ? AF_INET6 : AF_INET; 175 len = af == AF_INET ? NS_INADDRSZ : NS_IN6ADDRSZ; 176 if (inet_pton(af, *argv, &addr) == -1) 177 err(EXIT_FAILURE, "Can't parse `%s'", *argv); 178 if (*type == 'a') 179 geta(gethostbyaddr((const char *)&addr, len, af)); 180 else 181 getby(f, &info, &addr, len, af); 182 } else { 183 if (*type == 'a') 184 geta(gethostbyname2(*argv, af)); 185 else 186 getby(f, &info, *argv, len, af); 187 } 188 189 return 0; 190 } 191