getaddrinfo.c revision 1.4
1 /* $NetBSD: getaddrinfo.c,v 1.4 2014/04/22 02:23:03 ginsbach 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 1.4 2014/04/22 02:23:03 ginsbach 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 53 static void usage(void) __dead; 54 static void printaddrinfo(struct addrinfo *); 55 static bool parse_af(const char *, int *); 56 static bool parse_protocol(const char *, int *); 57 static bool parse_socktype(const char *, int *); 58 static bool parse_numeric_tabular(const char *, int *, const char *const *, 59 size_t); 60 61 int 62 main(int argc, char **argv) 63 { 64 static const struct addrinfo zero_addrinfo; 65 struct addrinfo hints = zero_addrinfo; 66 struct addrinfo *addrinfo; 67 const char *hostname = NULL, *service = NULL; 68 int ch; 69 int error; 70 71 setprogname(argv[0]); 72 73 hints.ai_family = AF_UNSPEC; 74 hints.ai_socktype = 0; 75 hints.ai_protocol = 0; 76 hints.ai_flags = 0; 77 78 while ((ch = getopt(argc, argv, "cf:nNp:Ps:t:")) != -1) { 79 switch (ch) { 80 case 'c': 81 hints.ai_flags |= AI_CANONNAME; 82 break; 83 84 case 'f': 85 if (!parse_af(optarg, &hints.ai_family)) { 86 warnx("invalid address family: %s", optarg); 87 usage(); 88 } 89 break; 90 91 case 'n': 92 hints.ai_flags |= AI_NUMERICHOST; 93 break; 94 95 case 'N': 96 hints.ai_flags |= AI_NUMERICSERV; 97 break; 98 99 case 's': 100 service = optarg; 101 break; 102 103 case 'p': 104 if (!parse_protocol(optarg, &hints.ai_protocol)) { 105 warnx("invalid protocol: %s", optarg); 106 usage(); 107 } 108 break; 109 110 case 'P': 111 hints.ai_flags |= AI_PASSIVE; 112 break; 113 114 case 't': 115 if (!parse_socktype(optarg, &hints.ai_socktype)) { 116 warnx("invalid socket type: %s", optarg); 117 usage(); 118 } 119 break; 120 121 case '?': 122 default: 123 usage(); 124 } 125 } 126 127 argc -= optind; 128 argv += optind; 129 130 if (!((argc == 1) || ((argc == 0) && (hints.ai_flags & AI_PASSIVE)))) 131 usage(); 132 if (argc == 1) 133 hostname = argv[0]; 134 135 if (service != NULL) { 136 char *p; 137 138 if ((p = strchr(service, '/')) != NULL) { 139 if (hints.ai_protocol != 0) { 140 warnx("protocol already specified"); 141 usage(); 142 } 143 *p = '\0'; 144 p++; 145 146 if (!parse_protocol(p, &hints.ai_protocol)) { 147 warnx("invalid protocol: %s", p); 148 usage(); 149 } 150 } 151 } 152 153 error = getaddrinfo(hostname, service, &hints, &addrinfo); 154 if (error) 155 errx(1, "%s", gai_strerror(error)); 156 157 if ((hints.ai_flags & AI_CANONNAME) && (addrinfo != NULL)) { 158 if (printf("canonname %s\n", addrinfo->ai_canonname) < 0) 159 err(1, "printf"); 160 } 161 162 printaddrinfo(addrinfo); 163 164 freeaddrinfo(addrinfo); 165 166 return 0; 167 } 168 169 static void __dead 170 usage(void) 171 { 172 173 (void)fprintf(stderr, "Usage: %s", getprogname()); 174 (void)fprintf(stderr, 175 " [-f <family>] [-p <protocol>] [-t <socktype>] [-s <service>]\n"); 176 (void)fprintf(stderr, " [-cnNP] [<hostname>]\n"); 177 exit(1); 178 } 179 180 static bool 181 parse_af(const char *string, int *afp) 182 { 183 184 return parse_numeric_tabular(string, afp, address_families, 185 __arraycount(address_families)); 186 } 187 188 static bool 189 parse_protocol(const char *string, int *protop) 190 { 191 struct protoent *protoent; 192 char *end; 193 long value; 194 195 errno = 0; 196 value = strtol(string, &end, 0); 197 if ((string[0] == '\0') || (*end != '\0')) 198 goto numeric_failed; 199 if ((errno == ERANGE) && ((value == LONG_MAX) || (value == LONG_MIN))) 200 goto numeric_failed; 201 if ((value > INT_MAX) || (value < INT_MIN)) 202 goto numeric_failed; 203 204 *protop = value; 205 return true; 206 207 numeric_failed: 208 protoent = getprotobyname(string); 209 if (protoent == NULL) 210 goto protoent_failed; 211 212 *protop = protoent->p_proto; 213 return true; 214 215 protoent_failed: 216 return false; 217 } 218 219 static bool 220 parse_socktype(const char *string, int *typep) 221 { 222 223 return parse_numeric_tabular(string, typep, socket_types, 224 __arraycount(socket_types)); 225 } 226 227 static bool 228 parse_numeric_tabular(const char *string, int *valuep, 229 const char *const *table, size_t n) 230 { 231 char *end; 232 long value; 233 size_t i; 234 235 assert((uintmax_t)n <= (uintmax_t)INT_MAX); 236 237 errno = 0; 238 value = strtol(string, &end, 0); 239 if ((string[0] == '\0') || (*end != '\0')) 240 goto numeric_failed; 241 if ((errno == ERANGE) && ((value == LONG_MAX) || (value == LONG_MIN))) 242 goto numeric_failed; 243 if ((value > INT_MAX) || (value < INT_MIN)) 244 goto numeric_failed; 245 246 *valuep = value; 247 return true; 248 249 numeric_failed: 250 for (i = 0; i < n; i++) 251 if ((table[i] != NULL) && (strcmp(string, table[i]) == 0)) 252 break; 253 if (i == n) 254 goto table_failed; 255 *valuep = i; 256 return true; 257 258 table_failed: 259 return false; 260 } 261 262 static void 263 printaddrinfo(struct addrinfo *addrinfo) 264 { 265 struct addrinfo *ai; 266 char buf[1024]; 267 int n; 268 struct protoent *protoent; 269 270 for (ai = addrinfo; ai != NULL; ai = ai->ai_next) { 271 /* Print the socket type. */ 272 if ((ai->ai_socktype >= 0) && 273 ((size_t)ai->ai_socktype < __arraycount(socket_types)) && 274 (socket_types[ai->ai_socktype] != NULL)) 275 n = printf("%s", socket_types[ai->ai_socktype]); 276 else 277 n = printf("%d", ai->ai_socktype); 278 if (n < 0) 279 err(1, "printf"); 280 281 /* Print the address family. */ 282 if ((ai->ai_family >= 0) && 283 ((size_t)ai->ai_family < __arraycount(address_families)) && 284 (address_families[ai->ai_family] != NULL)) 285 n = printf(" %s", address_families[ai->ai_family]); 286 else 287 n = printf(" %d", ai->ai_family); 288 if (n < 0) 289 err(1, "printf"); 290 291 /* Print the protocol number. */ 292 protoent = getprotobynumber(ai->ai_protocol); 293 if (protoent == NULL) 294 n = printf(" %d", ai->ai_protocol); 295 else 296 n = printf(" %s", protoent->p_name); 297 if (n < 0) 298 err(1, "printf"); 299 300 /* Format the sockaddr. */ 301 switch (ai->ai_family) { 302 case AF_INET: 303 case AF_INET6: 304 n = sockaddr_snprintf(buf, sizeof(buf), " %a %p", 305 ai->ai_addr); 306 break; 307 308 default: 309 n = sockaddr_snprintf(buf, sizeof(buf), 310 "%a %p %I %F %R %S", ai->ai_addr); 311 } 312 313 /* 314 * Check for sockaddr_snprintf failure. 315 * 316 * XXX sockaddr_snprintf's error reporting is botched 317 * -- man page says it sets errno, but if getnameinfo 318 * fails, errno is not where it reports the error... 319 */ 320 if (n < 0) { 321 warnx("sockaddr_snprintf failed"); 322 continue; 323 } 324 if (sizeof(buf) <= (size_t)n) 325 warnx("truncated sockaddr_snprintf output"); 326 327 /* Print the formatted sockaddr. */ 328 if (printf("%s\n", buf) < 0) 329 err(1, "printf"); 330 } 331 } 332
Indexes created Wed Oct 01 07:09:59 GMT 2025