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/param.h> 33 #include <sys/socket.h> 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 <stdio.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include <util.h> 47 48 #include "tables.h" 49 50 static void usage(void) __dead2; 51 static void printaddrinfo(struct addrinfo *); 52 static bool parse_af(const char *, int *); 53 static bool parse_protocol(const char *, int *); 54 static bool parse_socktype(const char *, int *); 55 static bool parse_numeric_tabular(const char *, int *, const char *const *, 56 size_t); 57 58 int 59 main(int argc, char **argv) 60 { 61 static const struct addrinfo zero_addrinfo; 62 struct addrinfo hints = zero_addrinfo; 63 struct addrinfo *addrinfo; 64 const char *hostname = NULL, *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 81 case 'f': 82 if (!parse_af(optarg, &hints.ai_family)) { 83 warnx("invalid address family: %s", optarg); 84 usage(); 85 } 86 break; 87 88 case 'n': 89 hints.ai_flags |= AI_NUMERICHOST; 90 break; 91 92 case 'N': 93 hints.ai_flags |= AI_NUMERICSERV; 94 break; 95 96 case 's': 97 service = optarg; 98 break; 99 100 case 'p': 101 if (!parse_protocol(optarg, &hints.ai_protocol)) { 102 warnx("invalid protocol: %s", optarg); 103 usage(); 104 } 105 break; 106 107 case 'P': 108 hints.ai_flags |= AI_PASSIVE; 109 break; 110 111 case 't': 112 if (!parse_socktype(optarg, &hints.ai_socktype)) { 113 warnx("invalid socket type: %s", optarg); 114 usage(); 115 } 116 break; 117 118 case '?': 119 default: 120 usage(); 121 } 122 } 123 124 argc -= optind; 125 argv += optind; 126 127 if (!((argc == 1) || ((argc == 0) && (hints.ai_flags & AI_PASSIVE)))) 128 usage(); 129 if (argc == 1) 130 hostname = argv[0]; 131 132 if (service != NULL) { 133 char *p; 134 135 if ((p = strchr(service, '/')) != NULL) { 136 if (hints.ai_protocol != 0) { 137 warnx("protocol already specified"); 138 usage(); 139 } 140 *p = '\0'; 141 p++; 142 143 if (!parse_protocol(p, &hints.ai_protocol)) { 144 warnx("invalid protocol: %s", p); 145 usage(); 146 } 147 } 148 } 149 150 error = getaddrinfo(hostname, service, &hints, &addrinfo); 151 if (error) 152 errx(1, "%s", gai_strerror(error)); 153 154 if ((hints.ai_flags & AI_CANONNAME) && (addrinfo != NULL)) { 155 if (printf("canonname %s\n", addrinfo->ai_canonname) < 0) 156 err(1, "printf"); 157 } 158 159 printaddrinfo(addrinfo); 160 161 freeaddrinfo(addrinfo); 162 163 return 0; 164 } 165 166 static void __dead2 167 usage(void) 168 { 169 170 (void)fprintf(stderr, "Usage: %s", getprogname()); 171 (void)fprintf(stderr, 172 " [-f <family>] [-p <protocol>] [-t <socktype>] [-s <service>]\n"); 173 (void)fprintf(stderr, " [-cnNP] [<hostname>]\n"); 174 exit(1); 175 } 176 177 static bool 178 parse_af(const char *string, int *afp) 179 { 180 181 return parse_numeric_tabular(string, afp, address_families, 182 nitems(address_families)); 183 } 184 185 static bool 186 parse_protocol(const char *string, int *protop) 187 { 188 struct protoent *protoent; 189 char *end; 190 long value; 191 192 errno = 0; 193 value = strtol(string, &end, 0); 194 if ((string[0] == '\0') || (*end != '\0')) 195 goto numeric_failed; 196 if ((errno == ERANGE) && ((value == LONG_MAX) || (value == LONG_MIN))) 197 goto numeric_failed; 198 if ((value > INT_MAX) || (value < INT_MIN)) 199 goto numeric_failed; 200 201 *protop = value; 202 return true; 203 204 numeric_failed: 205 protoent = getprotobyname(string); 206 if (protoent == NULL) 207 goto protoent_failed; 208 209 *protop = protoent->p_proto; 210 return true; 211 212 protoent_failed: 213 return false; 214 } 215 216 static bool 217 parse_socktype(const char *string, int *typep) 218 { 219 220 return parse_numeric_tabular(string, typep, socket_types, 221 nitems(socket_types)); 222 } 223 224 static bool 225 parse_numeric_tabular(const char *string, int *valuep, 226 const char *const *table, size_t n) 227 { 228 char *end; 229 long value; 230 size_t i; 231 232 assert((uintmax_t)n <= (uintmax_t)INT_MAX); 233 234 errno = 0; 235 value = strtol(string, &end, 0); 236 if ((string[0] == '\0') || (*end != '\0')) 237 goto numeric_failed; 238 if ((errno == ERANGE) && ((value == LONG_MAX) || (value == LONG_MIN))) 239 goto numeric_failed; 240 if ((value > INT_MAX) || (value < INT_MIN)) 241 goto numeric_failed; 242 243 *valuep = value; 244 return true; 245 246 numeric_failed: 247 for (i = 0; i < n; i++) 248 if ((table[i] != NULL) && (strcmp(string, table[i]) == 0)) 249 break; 250 if (i == n) 251 goto table_failed; 252 *valuep = i; 253 return true; 254 255 table_failed: 256 return false; 257 } 258 259 static void 260 printaddrinfo(struct addrinfo *addrinfo) 261 { 262 struct addrinfo *ai; 263 char buf[1024]; 264 int n; 265 struct protoent *protoent; 266 267 for (ai = addrinfo; ai != NULL; ai = ai->ai_next) { 268 /* Print the socket type. */ 269 if ((ai->ai_socktype >= 0) && 270 ((size_t)ai->ai_socktype < nitems(socket_types)) && 271 (socket_types[ai->ai_socktype] != NULL)) 272 n = printf("%s", socket_types[ai->ai_socktype]); 273 else 274 n = printf("%d", ai->ai_socktype); 275 if (n < 0) 276 err(1, "printf"); 277 278 /* Print the address family. */ 279 if ((ai->ai_family >= 0) && 280 ((size_t)ai->ai_family < nitems(address_families)) && 281 (address_families[ai->ai_family] != NULL)) 282 n = printf(" %s", address_families[ai->ai_family]); 283 else 284 n = printf(" %d", ai->ai_family); 285 if (n < 0) 286 err(1, "printf"); 287 288 /* Print the protocol number. */ 289 protoent = getprotobynumber(ai->ai_protocol); 290 if (protoent == NULL) 291 n = printf(" %d", ai->ai_protocol); 292 else 293 n = printf(" %s", protoent->p_name); 294 if (n < 0) 295 err(1, "printf"); 296 297 /* Format the sockaddr. */ 298 switch (ai->ai_family) { 299 case AF_INET: 300 case AF_INET6: 301 n = sockaddr_snprintf(buf, sizeof(buf), " %a %p", 302 ai->ai_addr); 303 break; 304 305 default: 306 n = sockaddr_snprintf(buf, sizeof(buf), 307 "%a %p %I %F %R %S", ai->ai_addr); 308 } 309 310 /* 311 * Check for sockaddr_snprintf failure. 312 * 313 * XXX sockaddr_snprintf's error reporting is botched 314 * -- man page says it sets errno, but if getnameinfo 315 * fails, errno is not where it reports the error... 316 */ 317 if (n < 0) { 318 warnx("sockaddr_snprintf failed"); 319 continue; 320 } 321 if (sizeof(buf) <= (size_t)n) 322 warnx("truncated sockaddr_snprintf output"); 323 324 /* Print the formatted sockaddr. */ 325 if (printf("%s\n", buf) < 0) 326 err(1, "printf"); 327 } 328 } 329