1 /* 2 * Copyright (c) 1999 - 2001 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifdef HAVE_CONFIG_H 35 #include <config.h> 36 RCSID("$Id: getaddrinfo.c,v 1.12 2001/08/17 13:06:57 joda Exp $"); 37 #endif 38 39 #include "roken.h" 40 41 /* 42 * uses hints->ai_socktype and hints->ai_protocol 43 */ 44 45 static int 46 get_port_protocol_socktype (const char *servname, 47 const struct addrinfo *hints, 48 int *port, 49 int *protocol, 50 int *socktype) 51 { 52 struct servent *se; 53 const char *proto_str = NULL; 54 55 *socktype = 0; 56 57 if (hints != NULL && hints->ai_protocol != 0) { 58 struct protoent *protoent = getprotobynumber (hints->ai_protocol); 59 60 if (protoent == NULL) 61 return EAI_SOCKTYPE; /* XXX */ 62 63 proto_str = protoent->p_name; 64 *protocol = protoent->p_proto; 65 } 66 67 if (hints != NULL) 68 *socktype = hints->ai_socktype; 69 70 if (*socktype == SOCK_STREAM) { 71 se = getservbyname (servname, proto_str ? proto_str : "tcp"); 72 if (proto_str == NULL) 73 *protocol = IPPROTO_TCP; 74 } else if (*socktype == SOCK_DGRAM) { 75 se = getservbyname (servname, proto_str ? proto_str : "udp"); 76 if (proto_str == NULL) 77 *protocol = IPPROTO_UDP; 78 } else if (*socktype == 0) { 79 if (proto_str != NULL) { 80 se = getservbyname (servname, proto_str); 81 } else { 82 se = getservbyname (servname, "tcp"); 83 *protocol = IPPROTO_TCP; 84 *socktype = SOCK_STREAM; 85 if (se == NULL) { 86 se = getservbyname (servname, "udp"); 87 *protocol = IPPROTO_UDP; 88 *socktype = SOCK_DGRAM; 89 } 90 } 91 } else 92 return EAI_SOCKTYPE; 93 94 if (se == NULL) { 95 char *endstr; 96 97 *port = htons(strtol (servname, &endstr, 10)); 98 if (servname == endstr) 99 return EAI_NONAME; 100 } else { 101 *port = se->s_port; 102 } 103 return 0; 104 } 105 106 static int 107 add_one (int port, int protocol, int socktype, 108 struct addrinfo ***ptr, 109 int (*func)(struct addrinfo *, void *data, int port), 110 void *data, 111 char *canonname) 112 { 113 struct addrinfo *a; 114 int ret; 115 116 a = malloc (sizeof (*a)); 117 if (a == NULL) 118 return EAI_MEMORY; 119 memset (a, 0, sizeof(*a)); 120 a->ai_flags = 0; 121 a->ai_next = NULL; 122 a->ai_protocol = protocol; 123 a->ai_socktype = socktype; 124 a->ai_canonname = canonname; 125 ret = (*func)(a, data, port); 126 if (ret) { 127 free (a); 128 return ret; 129 } 130 **ptr = a; 131 *ptr = &a->ai_next; 132 return 0; 133 } 134 135 static int 136 const_v4 (struct addrinfo *a, void *data, int port) 137 { 138 struct sockaddr_in *sin; 139 struct in_addr *addr = (struct in_addr *)data; 140 141 a->ai_family = PF_INET; 142 a->ai_addrlen = sizeof(*sin); 143 a->ai_addr = malloc (sizeof(*sin)); 144 if (a->ai_addr == NULL) 145 return EAI_MEMORY; 146 sin = (struct sockaddr_in *)a->ai_addr; 147 memset (sin, 0, sizeof(*sin)); 148 sin->sin_family = AF_INET; 149 sin->sin_port = port; 150 sin->sin_addr = *addr; 151 return 0; 152 } 153 154 #ifdef HAVE_IPV6 155 static int 156 const_v6 (struct addrinfo *a, void *data, int port) 157 { 158 struct sockaddr_in6 *sin6; 159 struct in6_addr *addr = (struct in6_addr *)data; 160 161 a->ai_family = PF_INET6; 162 a->ai_addrlen = sizeof(*sin6); 163 a->ai_addr = malloc (sizeof(*sin6)); 164 if (a->ai_addr == NULL) 165 return EAI_MEMORY; 166 sin6 = (struct sockaddr_in6 *)a->ai_addr; 167 memset (sin6, 0, sizeof(*sin6)); 168 sin6->sin6_family = AF_INET6; 169 sin6->sin6_port = port; 170 sin6->sin6_addr = *addr; 171 return 0; 172 } 173 #endif 174 175 /* this is mostly a hack for some versions of AIX that has a prototype 176 for in6addr_loopback but no actual symbol in libc */ 177 #if defined(HAVE_IPV6) && !defined(HAVE_IN6ADDR_LOOPBACK) && defined(IN6ADDR_LOOPBACK_INIT) 178 #define in6addr_loopback _roken_in6addr_loopback 179 struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 180 #endif 181 182 static int 183 get_null (const struct addrinfo *hints, 184 int port, int protocol, int socktype, 185 struct addrinfo **res) 186 { 187 struct in_addr v4_addr; 188 #ifdef HAVE_IPV6 189 struct in6_addr v6_addr; 190 #endif 191 struct addrinfo *first = NULL; 192 struct addrinfo **current = &first; 193 int family = PF_UNSPEC; 194 int ret; 195 196 if (hints != NULL) 197 family = hints->ai_family; 198 199 if (hints && hints->ai_flags & AI_PASSIVE) { 200 v4_addr.s_addr = INADDR_ANY; 201 #ifdef HAVE_IPV6 202 v6_addr = in6addr_any; 203 #endif 204 } else { 205 v4_addr.s_addr = htonl(INADDR_LOOPBACK); 206 #ifdef HAVE_IPV6 207 v6_addr = in6addr_loopback; 208 #endif 209 } 210 211 #ifdef HAVE_IPV6 212 if (family == PF_INET6 || family == PF_UNSPEC) { 213 ret = add_one (port, protocol, socktype, 214 ¤t, const_v6, &v6_addr, NULL); 215 } 216 #endif 217 if (family == PF_INET || family == PF_UNSPEC) { 218 ret = add_one (port, protocol, socktype, 219 ¤t, const_v4, &v4_addr, NULL); 220 } 221 *res = first; 222 return 0; 223 } 224 225 static int 226 add_hostent (int port, int protocol, int socktype, 227 struct addrinfo ***current, 228 int (*func)(struct addrinfo *, void *data, int port), 229 struct hostent *he, int *flags) 230 { 231 int ret; 232 char *canonname = NULL; 233 char **h; 234 235 if (*flags & AI_CANONNAME) { 236 struct hostent *he2 = NULL; 237 const char *tmp_canon; 238 239 tmp_canon = hostent_find_fqdn (he); 240 if (strchr (tmp_canon, '.') == NULL) { 241 int error; 242 243 he2 = getipnodebyaddr (he->h_addr_list[0], he->h_length, 244 he->h_addrtype, &error); 245 if (he2 != NULL) { 246 const char *tmp = hostent_find_fqdn (he2); 247 248 if (strchr (tmp, '.') != NULL) 249 tmp_canon = tmp; 250 } 251 } 252 253 canonname = strdup (tmp_canon); 254 if (he2 != NULL) 255 freehostent (he2); 256 if (canonname == NULL) 257 return EAI_MEMORY; 258 } 259 260 for (h = he->h_addr_list; *h != NULL; ++h) { 261 ret = add_one (port, protocol, socktype, 262 current, func, *h, canonname); 263 if (ret) 264 return ret; 265 if (*flags & AI_CANONNAME) { 266 *flags &= ~AI_CANONNAME; 267 canonname = NULL; 268 } 269 } 270 return 0; 271 } 272 273 static int 274 get_number (const char *nodename, 275 const struct addrinfo *hints, 276 int port, int protocol, int socktype, 277 struct addrinfo **res) 278 { 279 struct addrinfo *first = NULL; 280 struct addrinfo **current = &first; 281 int family = PF_UNSPEC; 282 int ret; 283 284 if (hints != NULL) { 285 family = hints->ai_family; 286 } 287 288 #ifdef HAVE_IPV6 289 if (family == PF_INET6 || family == PF_UNSPEC) { 290 struct in6_addr v6_addr; 291 292 if (inet_pton (PF_INET6, nodename, &v6_addr) == 1) { 293 ret = add_one (port, protocol, socktype, 294 ¤t, const_v6, &v6_addr, NULL); 295 *res = first; 296 return ret; 297 } 298 } 299 #endif 300 if (family == PF_INET || family == PF_UNSPEC) { 301 struct in_addr v4_addr; 302 303 if (inet_pton (PF_INET, nodename, &v4_addr) == 1) { 304 ret = add_one (port, protocol, socktype, 305 ¤t, const_v4, &v4_addr, NULL); 306 *res = first; 307 return ret; 308 } 309 } 310 return EAI_NONAME; 311 } 312 313 static int 314 get_nodes (const char *nodename, 315 const struct addrinfo *hints, 316 int port, int protocol, int socktype, 317 struct addrinfo **res) 318 { 319 struct addrinfo *first = NULL; 320 struct addrinfo **current = &first; 321 int family = PF_UNSPEC; 322 int flags = 0; 323 int ret = EAI_NONAME; 324 int error; 325 326 if (hints != NULL) { 327 family = hints->ai_family; 328 flags = hints->ai_flags; 329 } 330 331 #ifdef HAVE_IPV6 332 if (family == PF_INET6 || family == PF_UNSPEC) { 333 struct hostent *he; 334 335 he = getipnodebyname (nodename, PF_INET6, 0, &error); 336 337 if (he != NULL) { 338 ret = add_hostent (port, protocol, socktype, 339 ¤t, const_v6, he, &flags); 340 freehostent (he); 341 } 342 } 343 #endif 344 if (family == PF_INET || family == PF_UNSPEC) { 345 struct hostent *he; 346 347 he = getipnodebyname (nodename, PF_INET, 0, &error); 348 349 if (he != NULL) { 350 ret = add_hostent (port, protocol, socktype, 351 ¤t, const_v4, he, &flags); 352 freehostent (he); 353 } 354 } 355 *res = first; 356 return ret; 357 } 358 359 /* 360 * hints: 361 * 362 * struct addrinfo { 363 * int ai_flags; 364 * int ai_family; 365 * int ai_socktype; 366 * int ai_protocol; 367 * ... 368 * }; 369 */ 370 371 int 372 getaddrinfo(const char *nodename, 373 const char *servname, 374 const struct addrinfo *hints, 375 struct addrinfo **res) 376 { 377 int ret; 378 int port = 0; 379 int protocol = 0; 380 int socktype = 0; 381 382 *res = NULL; 383 384 if (servname == NULL && nodename == NULL) 385 return EAI_NONAME; 386 387 if (hints != NULL 388 && hints->ai_family != PF_UNSPEC 389 && hints->ai_family != PF_INET 390 #ifdef HAVE_IPV6 391 && hints->ai_family != PF_INET6 392 #endif 393 ) 394 return EAI_FAMILY; 395 396 if (servname != NULL) { 397 ret = get_port_protocol_socktype (servname, hints, 398 &port, &protocol, &socktype); 399 if (ret) 400 return ret; 401 } 402 if (nodename != NULL) { 403 ret = get_number (nodename, hints, port, protocol, socktype, res); 404 if (ret) { 405 if(hints && hints->ai_flags & AI_NUMERICHOST) 406 ret = EAI_NONAME; 407 else 408 ret = get_nodes (nodename, hints, port, protocol, socktype, 409 res); 410 } 411 } else { 412 ret = get_null (hints, port, protocol, socktype, res); 413 } 414 if (ret) 415 freeaddrinfo (*res); 416 return ret; 417 } 418