1 /* $NetBSD: h_hostent.c,v 1.2 2014/01/09 02:18:10 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 1.2 2014/01/09 02:18:10 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 extern const char *__res_conf_name; 51 52 static void 53 phostent(const struct hostent *h) 54 { 55 size_t i; 56 char buf[1024]; 57 const int af = h->h_length == NS_INADDRSZ ? AF_INET : AF_INET6; 58 59 printf("name=%s, length=%d, addrtype=%d, aliases=[", 60 h->h_name, h->h_length, h->h_addrtype); 61 62 for (i = 0; h->h_aliases[i]; i++) 63 printf("%s%s", i == 0 ? "" : " ", h->h_aliases[i]); 64 65 printf("] addr_list=["); 66 67 for (i = 0; h->h_addr_list[i]; i++) 68 printf("%s%s", i == 0 ? "" : " ", inet_ntop(af, 69 h->h_addr_list[i], buf, (socklen_t)sizeof(buf))); 70 71 printf("]\n"); 72 } 73 74 static void 75 usage(void) 76 { 77 (void)fprintf(stderr, "Usage: %s [-f <hostsfile>] " 78 "[-t <any|dns|nis|files>] " 79 "[-46a] <name|address>\n", getprogname()); 80 exit(EXIT_FAILURE); 81 } 82 83 static void 84 getby(int (*f)(void *, void *, va_list), struct getnamaddr *info, ...) 85 { 86 va_list ap; 87 int e; 88 89 va_start(ap, info); 90 e = (*f)(info, NULL, ap); 91 va_end(ap); 92 switch (e) { 93 case NS_SUCCESS: 94 phostent(info->hp); 95 break; 96 default: 97 printf("error %d\n", e); 98 break; 99 } 100 } 101 102 static void 103 geta(struct hostent *hp) { 104 if (hp == NULL) 105 printf("error %d\n", h_errno); 106 else 107 phostent(hp); 108 } 109 110 int 111 main(int argc, char *argv[]) 112 { 113 int (*f)(void *, void *, va_list) = NULL; 114 const char *type = "any"; 115 int c, af, e, byaddr, len; 116 struct hostent hent; 117 struct getnamaddr info; 118 char buf[4096]; 119 120 af = AF_INET; 121 byaddr = 0; 122 len = 0; 123 info.hp = &hent; 124 info.buf = buf; 125 info.buflen = sizeof(buf); 126 info.he = &e; 127 128 while ((c = getopt(argc, argv, "46af:r:t:")) != -1) { 129 switch (c) { 130 case '4': 131 af = AF_INET; 132 break; 133 case '6': 134 af = AF_INET6; 135 break; 136 case 'a': 137 byaddr++; 138 break; 139 case 'f': 140 _hf_sethostsfile(optarg); 141 break; 142 case 'r': 143 __res_conf_name = optarg; 144 break; 145 case 't': 146 type = optarg; 147 break; 148 default: 149 usage(); 150 } 151 } 152 153 argc -= optind; 154 argv += optind; 155 156 if (argc != 1) 157 usage(); 158 159 switch (*type) { 160 case 'a': 161 break; 162 case 'd': 163 f = byaddr ? _dns_gethtbyaddr : _dns_gethtbyname; 164 break; 165 #ifdef YP 166 case 'n': 167 f = byaddr ? _yp_gethtbyaddr : _yp_gethtbyname; 168 break; 169 #endif 170 case 'f': 171 f = byaddr ? _hf_gethtbyaddr : _hf_gethtbyname; 172 break; 173 default: 174 errx(EXIT_FAILURE, "Unknown db type `%s'", type); 175 } 176 177 if (byaddr) { 178 struct in6_addr addr; 179 af = strchr(*argv, ':') ? AF_INET6 : AF_INET; 180 len = af == AF_INET ? NS_INADDRSZ : NS_IN6ADDRSZ; 181 if (inet_pton(af, *argv, &addr) == -1) 182 err(EXIT_FAILURE, "Can't parse `%s'", *argv); 183 if (*type == 'a') 184 geta(gethostbyaddr((const char *)&addr, len, af)); 185 else 186 getby(f, &info, &addr, len, af); 187 } else { 188 if (*type == 'a') 189 geta(gethostbyname2(*argv, af)); 190 else 191 getby(f, &info, *argv, len, af); 192 } 193 194 return 0; 195 } 196