1 /* $NetBSD: getaddrinfo.c,v 1.1 2013/09/30 06:19:22 riastradh 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 1.1 2013/09/30 06:19:22 riastradh Exp $"); 34 35 #include <assert.h> 36 #include <err.h> 37 #include <errno.h> 38 #include <limits.h> 39 #include <netdb.h> 40 #include <stdbool.h> 41 #include <stdint.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 #include <util.h> 46 47 #include "tables.h" 48 49 static void usage(void) __dead; 50 static void printaddrinfo(struct addrinfo *); 51 static bool parse_af(const char *, int *); 52 static bool parse_protocol(const char *, int *); 53 static bool parse_socktype(const char *, int *); 54 static bool parse_numeric_tabular(const char *, int *, const char *const *, 55 size_t); 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, *service = NULL; 64 int ch; 65 int error; 66 67 setprogname(argv[0]); 68 69 hints.ai_family = AF_UNSPEC; 70 hints.ai_socktype = 0; 71 hints.ai_protocol = 0; 72 hints.ai_flags = 0; 73 74 while ((ch = getopt(argc, argv, "cf:nNp:Ps:t:")) != -1) { 75 switch (ch) { 76 case 'c': 77 hints.ai_flags |= AI_CANONNAME; 78 break; 79 80 case 'f': 81 if (!parse_af(optarg, &hints.ai_family)) { 82 warnx("invalid address family: %s", optarg); 83 usage(); 84 } 85 break; 86 87 case 'n': 88 hints.ai_flags |= AI_NUMERICHOST; 89 break; 90 91 case 'N': 92 hints.ai_flags |= AI_NUMERICSERV; 93 break; 94 95 case 's': 96 service = optarg; 97 break; 98 99 case 'p': 100 if (!parse_protocol(optarg, &hints.ai_protocol)) { 101 warnx("invalid protocol: %s", optarg); 102 usage(); 103 } 104 105 case 'P': 106 hints.ai_flags |= AI_PASSIVE; 107 break; 108 109 case 't': 110 if (!parse_socktype(optarg, &hints.ai_socktype)) { 111 warnx("invalid socket type: %s", optarg); 112 usage(); 113 } 114 break; 115 116 case '?': 117 default: 118 usage(); 119 } 120 } 121 122 argc -= optind; 123 argv += optind; 124 125 if (!((argc == 1) || ((argc == 0) && (hints.ai_flags & AI_PASSIVE)))) 126 usage(); 127 if (argc == 1) 128 hostname = argv[0]; 129 130 error = getaddrinfo(hostname, service, &hints, &addrinfo); 131 if (error) 132 errx(1, "%s", gai_strerror(error)); 133 134 if ((hints.ai_flags & AI_CANONNAME) && (addrinfo != NULL)) { 135 if (printf("canonname %s\n", addrinfo->ai_canonname) < 0) 136 err(1, "printf"); 137 } 138 139 printaddrinfo(addrinfo); 140 141 freeaddrinfo(addrinfo); 142 143 return 0; 144 } 145 146 static void __dead 147 usage(void) 148 { 149 150 (void)fprintf(stderr, "Usage: %s", getprogname()); 151 (void)fprintf(stderr, 152 " [-f <family>] [-p <protocol>] [-t <socktype>] [-s <service>]\n"); 153 (void)fprintf(stderr, " [-cnNP] [<hostname>]\n"); 154 exit(1); 155 } 156 157 static bool 158 parse_af(const char *string, int *afp) 159 { 160 161 return parse_numeric_tabular(string, afp, address_families, 162 __arraycount(address_families)); 163 } 164 165 static bool 166 parse_protocol(const char *string, int *protop) 167 { 168 struct protoent *protoent; 169 char *end; 170 long value; 171 172 errno = 0; 173 value = strtol(string, &end, 0); 174 if ((string[0] == '\0') || (*end != '\0')) 175 goto numeric_failed; 176 if ((errno == ERANGE) && ((value == LONG_MAX) || (value == LONG_MIN))) 177 goto numeric_failed; 178 if ((value > INT_MAX) || (value < INT_MIN)) 179 goto numeric_failed; 180 181 *protop = value; 182 return true; 183 184 numeric_failed: 185 protoent = getprotobyname(string); 186 if (protoent == NULL) 187 goto protoent_failed; 188 189 *protop = protoent->p_proto; 190 return true; 191 192 protoent_failed: 193 return false; 194 } 195 196 static bool 197 parse_socktype(const char *string, int *typep) 198 { 199 200 return parse_numeric_tabular(string, typep, socket_types, 201 __arraycount(socket_types)); 202 } 203 204 static bool 205 parse_numeric_tabular(const char *string, int *valuep, 206 const char *const *table, size_t n) 207 { 208 char *end; 209 long value; 210 size_t i; 211 212 assert((uintmax_t)n <= (uintmax_t)INT_MAX); 213 214 errno = 0; 215 value = strtol(string, &end, 0); 216 if ((string[0] == '\0') || (*end != '\0')) 217 goto numeric_failed; 218 if ((errno == ERANGE) && ((value == LONG_MAX) || (value == LONG_MIN))) 219 goto numeric_failed; 220 if ((value > INT_MAX) || (value < INT_MIN)) 221 goto numeric_failed; 222 223 *valuep = value; 224 return true; 225 226 numeric_failed: 227 for (i = 0; i < n; i++) 228 if ((table[i] != NULL) && (strcmp(string, table[i]) == 0)) 229 break; 230 if (i == n) 231 goto table_failed; 232 *valuep = i; 233 return true; 234 235 table_failed: 236 return false; 237 } 238 239 static void 240 printaddrinfo(struct addrinfo *addrinfo) 241 { 242 struct addrinfo *ai; 243 char buf[1024]; 244 int n; 245 struct protoent *protoent; 246 247 for (ai = addrinfo; ai != NULL; ai = ai->ai_next) { 248 /* Print the socket type. */ 249 if ((ai->ai_socktype >= 0) && 250 ((size_t)ai->ai_socktype < __arraycount(socket_types)) && 251 (socket_types[ai->ai_socktype] != NULL)) 252 n = printf("%s", socket_types[ai->ai_socktype]); 253 else 254 n = printf("%d", ai->ai_socktype); 255 if (n < 0) 256 err(1, "printf"); 257 258 /* Print the address family. */ 259 if ((ai->ai_family >= 0) && 260 ((size_t)ai->ai_family < __arraycount(address_families)) && 261 (address_families[ai->ai_family] != NULL)) 262 n = printf(" %s", address_families[ai->ai_family]); 263 else 264 n = printf(" %d", ai->ai_family); 265 if (n < 0) 266 err(1, "printf"); 267 268 /* Print the protocol number. */ 269 protoent = getprotobynumber(ai->ai_protocol); 270 if (protoent == NULL) 271 n = printf(" %d", ai->ai_protocol); 272 else 273 n = printf(" %s", protoent->p_name); 274 if (n < 0) 275 err(1, "printf"); 276 277 /* Format the sockaddr. */ 278 switch (ai->ai_family) { 279 case AF_INET: 280 case AF_INET6: 281 n = sockaddr_snprintf(buf, sizeof(buf), " %a %p", 282 ai->ai_addr); 283 break; 284 285 default: 286 n = sockaddr_snprintf(buf, sizeof(buf), 287 "%a %p %I %F %R %S", ai->ai_addr); 288 } 289 290 /* 291 * Check for sockaddr_snprintf failure. 292 * 293 * XXX sockaddr_snprintf's error reporting is botched 294 * -- man page says it sets errno, but if getnameinfo 295 * fails, errno is not where it reports the error... 296 */ 297 if (n < 0) { 298 warnx("sockaddr_snprintf failed"); 299 continue; 300 } 301 if (sizeof(buf) <= (size_t)n) 302 warnx("truncated sockaddr_snprintf output"); 303 304 /* Print the formatted sockaddr. */ 305 if (printf("%s\n", buf) < 0) 306 err(1, "printf"); 307 } 308 } 309