1 /* $NetBSD: getaddrinfo.c,v 1.6 2025/02/06 19:35:28 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 Taylor R. Campbell. 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 32 #include <sys/cdefs.h> 33 __RCSID("$NetBSD: getaddrinfo.c,v 1.6 2025/02/06 19:35:28 christos Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/socket.h> 37 38 #include <assert.h> 39 #include <err.h> 40 #include <errno.h> 41 #include <limits.h> 42 #include <netdb.h> 43 #include <stdbool.h> 44 #include <stdint.h> 45 #include <stdlib.h> 46 #include <stdio.h> 47 #include <string.h> 48 #include <unistd.h> 49 #include <util.h> 50 51 #include "tables.h" 52 #include "support.h" 53 54 static void usage(void) __dead; 55 static void printaddrinfo(struct addrinfo *); 56 57 int 58 main(int argc, char **argv) 59 { 60 static const struct addrinfo zero_addrinfo; 61 struct addrinfo hints = zero_addrinfo; 62 struct addrinfo *addrinfo; 63 const char *hostname = NULL; 64 char *service = NULL; 65 int ch; 66 int error; 67 68 setprogname(argv[0]); 69 70 hints.ai_family = AF_UNSPEC; 71 hints.ai_socktype = 0; 72 hints.ai_protocol = 0; 73 hints.ai_flags = 0; 74 75 while ((ch = getopt(argc, argv, "cf:nNp:Ps:t:")) != -1) { 76 switch (ch) { 77 case 'c': 78 hints.ai_flags |= AI_CANONNAME; 79 break; 80 case 'f': 81 if (!parse_af(optarg, &hints.ai_family)) { 82 warnx("invalid address family: %s", optarg); 83 usage(); 84 } 85 break; 86 case 'n': 87 hints.ai_flags |= AI_NUMERICHOST; 88 break; 89 case 'N': 90 hints.ai_flags |= AI_NUMERICSERV; 91 break; 92 case 's': 93 service = optarg; 94 break; 95 case 'p': 96 if (!parse_protocol(optarg, &hints.ai_protocol)) { 97 warnx("invalid protocol: %s", optarg); 98 usage(); 99 } 100 break; 101 case 'P': 102 hints.ai_flags |= AI_PASSIVE; 103 break; 104 case 't': 105 if (!parse_socktype(optarg, &hints.ai_socktype)) { 106 warnx("invalid socket type: %s", optarg); 107 usage(); 108 } 109 break; 110 case '?': 111 default: 112 usage(); 113 } 114 } 115 116 argc -= optind; 117 argv += optind; 118 119 if (!((argc == 1) || ((argc == 0) && (hints.ai_flags & AI_PASSIVE)))) 120 usage(); 121 if (argc == 1) 122 hostname = argv[0]; 123 124 if (service != NULL) { 125 char *p; 126 127 if ((p = strchr(service, '/')) != NULL) { 128 if (hints.ai_protocol != 0) { 129 warnx("protocol already specified"); 130 usage(); 131 } 132 *p = '\0'; 133 p++; 134 135 if (!parse_protocol(p, &hints.ai_protocol)) { 136 warnx("invalid protocol: %s", p); 137 usage(); 138 } 139 } 140 } 141 142 error = getaddrinfo(hostname, service, &hints, &addrinfo); 143 if (error) 144 errx(1, "%s", gai_strerror(error)); 145 146 if ((hints.ai_flags & AI_CANONNAME) && (addrinfo != NULL)) { 147 if (printf("canonname %s\n", addrinfo->ai_canonname) < 0) 148 err(1, "printf"); 149 } 150 151 printaddrinfo(addrinfo); 152 153 freeaddrinfo(addrinfo); 154 155 return 0; 156 } 157 158 static void __dead 159 usage(void) 160 { 161 162 (void)fprintf(stderr, "Usage: %s", getprogname()); 163 (void)fprintf(stderr, 164 " [-f <family>] [-p <protocol>] [-t <socktype>] [-s <service>]\n"); 165 (void)fprintf(stderr, " [-cnNP] [<hostname>]\n"); 166 exit(1); 167 } 168 169 static void 170 printaddrinfo(struct addrinfo *addrinfo) 171 { 172 struct addrinfo *ai; 173 char buf[1024]; 174 int n; 175 struct protoent *protoent; 176 177 for (ai = addrinfo; ai != NULL; ai = ai->ai_next) { 178 /* Print the socket type. */ 179 if ((ai->ai_socktype >= 0) && 180 ((size_t)ai->ai_socktype < __arraycount(socket_types)) && 181 (socket_types[ai->ai_socktype] != NULL)) 182 n = printf("%s", socket_types[ai->ai_socktype]); 183 else 184 n = printf("%d", ai->ai_socktype); 185 if (n < 0) 186 err(1, "printf"); 187 188 /* Print the address family. */ 189 if ((ai->ai_family >= 0) && 190 ((size_t)ai->ai_family < __arraycount(address_families)) && 191 (address_families[ai->ai_family] != NULL)) 192 n = printf(" %s", address_families[ai->ai_family]); 193 else 194 n = printf(" %d", ai->ai_family); 195 if (n < 0) 196 err(1, "printf"); 197 198 /* Print the protocol number. */ 199 protoent = getprotobynumber(ai->ai_protocol); 200 if (protoent == NULL) 201 n = printf(" %d", ai->ai_protocol); 202 else 203 n = printf(" %s", protoent->p_name); 204 if (n < 0) 205 err(1, "printf"); 206 207 /* Format the sockaddr. */ 208 switch (ai->ai_family) { 209 case AF_INET: 210 case AF_INET6: 211 n = sockaddr_snprintf(buf, sizeof(buf), " %a %p", 212 ai->ai_addr); 213 break; 214 default: 215 n = sockaddr_snprintf(buf, sizeof(buf), 216 "%a %p %I %F %R %S", ai->ai_addr); 217 } 218 219 /* 220 * Check for sockaddr_snprintf failure. 221 * 222 * XXX sockaddr_snprintf's error reporting is botched 223 * -- man page says it sets errno, but if getnameinfo 224 * fails, errno is not where it reports the error... 225 */ 226 if (n < 0) { 227 warnx("sockaddr_snprintf failed"); 228 continue; 229 } 230 if (sizeof(buf) <= (size_t)n) 231 warnx("truncated sockaddr_snprintf output"); 232 233 /* Print the formatted sockaddr. */ 234 if (printf("%s\n", buf) < 0) 235 err(1, "printf"); 236 } 237 } 238
Indexes created Wed Oct 01 07:09:59 GMT 2025