1 /* $NetBSD: getaddrinfo.c,v 1.1.1.1 2011/04/13 18:15:41 elric Exp $ */ 2 3 /* 4 * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 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 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <config.h> 37 38 #include <krb5/roken.h> 39 40 /* 41 * uses hints->ai_socktype and hints->ai_protocol 42 */ 43 44 static int 45 get_port_protocol_socktype (const char *servname, 46 const struct addrinfo *hints, 47 int *port, 48 int *protocol, 49 int *socktype) 50 { 51 struct servent *se; 52 const char *proto_str = NULL; 53 54 *socktype = 0; 55 56 if (hints != NULL && hints->ai_protocol != 0) { 57 struct protoent *protoent = getprotobynumber (hints->ai_protocol); 58 59 if (protoent == NULL) 60 return EAI_SOCKTYPE; /* XXX */ 61 62 proto_str = protoent->p_name; 63 *protocol = protoent->p_proto; 64 } 65 66 if (hints != NULL) 67 *socktype = hints->ai_socktype; 68 69 if (*socktype == SOCK_STREAM) { 70 se = getservbyname (servname, proto_str ? proto_str : "tcp"); 71 if (proto_str == NULL) 72 *protocol = IPPROTO_TCP; 73 } else if (*socktype == SOCK_DGRAM) { 74 se = getservbyname (servname, proto_str ? proto_str : "udp"); 75 if (proto_str == NULL) 76 *protocol = IPPROTO_UDP; 77 } else if (*socktype == 0) { 78 if (proto_str != NULL) { 79 se = getservbyname (servname, proto_str); 80 } else { 81 se = getservbyname (servname, "tcp"); 82 *protocol = IPPROTO_TCP; 83 *socktype = SOCK_STREAM; 84 if (se == NULL) { 85 se = getservbyname (servname, "udp"); 86 *protocol = IPPROTO_UDP; 87 *socktype = SOCK_DGRAM; 88 } 89 } 90 } else 91 return EAI_SOCKTYPE; 92 93 if (se == NULL) { 94 char *endstr; 95 96 *port = htons(strtol (servname, &endstr, 10)); 97 if (servname == endstr) 98 return EAI_NONAME; 99 } else { 100 *port = se->s_port; 101 } 102 return 0; 103 } 104 105 static int 106 add_one (int port, int protocol, int socktype, 107 struct addrinfo ***ptr, 108 int (*func)(struct addrinfo *, void *data, int port), 109 void *data, 110 char *canonname) 111 { 112 struct addrinfo *a; 113 int ret; 114 115 a = malloc (sizeof (*a)); 116 if (a == NULL) 117 return EAI_MEMORY; 118 memset (a, 0, sizeof(*a)); 119 a->ai_flags = 0; 120 a->ai_next = NULL; 121 a->ai_protocol = protocol; 122 a->ai_socktype = socktype; 123 a->ai_canonname = canonname; 124 ret = (*func)(a, data, port); 125 if (ret) { 126 free (a); 127 return ret; 128 } 129 **ptr = a; 130 *ptr = &a->ai_next; 131 return 0; 132 } 133 134 static int 135 const_v4 (struct addrinfo *a, void *data, int port) 136 { 137 struct sockaddr_in *sin4; 138 struct in_addr *addr = (struct in_addr *)data; 139 140 a->ai_family = PF_INET; 141 a->ai_addrlen = sizeof(*sin4); 142 a->ai_addr = malloc (sizeof(*sin4)); 143 if (a->ai_addr == NULL) 144 return EAI_MEMORY; 145 sin4 = (struct sockaddr_in *)a->ai_addr; 146 memset (sin4, 0, sizeof(*sin4)); 147 sin4->sin_family = AF_INET; 148 sin4->sin_port = port; 149 sin4->sin_addr = *addr; 150 return 0; 151 } 152 153 #ifdef HAVE_IPV6 154 static int 155 const_v6 (struct addrinfo *a, void *data, int port) 156 { 157 struct sockaddr_in6 *sin6; 158 struct in6_addr *addr = (struct in6_addr *)data; 159 160 a->ai_family = PF_INET6; 161 a->ai_addrlen = sizeof(*sin6); 162 a->ai_addr = malloc (sizeof(*sin6)); 163 if (a->ai_addr == NULL) 164 return EAI_MEMORY; 165 sin6 = (struct sockaddr_in6 *)a->ai_addr; 166 memset (sin6, 0, sizeof(*sin6)); 167 sin6->sin6_family = AF_INET6; 168 sin6->sin6_port = port; 169 sin6->sin6_addr = *addr; 170 return 0; 171 } 172 #endif 173 174 /* this is mostly a hack for some versions of AIX that has a prototype 175 for in6addr_loopback but no actual symbol in libc */ 176 #if defined(HAVE_IPV6) && !defined(HAVE_IN6ADDR_LOOPBACK) && defined(IN6ADDR_LOOPBACK_INIT) 177 #define in6addr_loopback _roken_in6addr_loopback 178 struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 179 #endif 180 181 static int 182 get_null (const struct addrinfo *hints, 183 int port, int protocol, int socktype, 184 struct addrinfo **res) 185 { 186 struct in_addr v4_addr; 187 #ifdef HAVE_IPV6 188 struct in6_addr v6_addr; 189 #endif 190 struct addrinfo *first = NULL; 191 struct addrinfo **current = &first; 192 int family = PF_UNSPEC; 193 int ret; 194 195 if (hints != NULL) 196 family = hints->ai_family; 197 198 if (hints && hints->ai_flags & AI_PASSIVE) { 199 v4_addr.s_addr = INADDR_ANY; 200 #ifdef HAVE_IPV6 201 v6_addr = in6addr_any; 202 #endif 203 } else { 204 v4_addr.s_addr = htonl(INADDR_LOOPBACK); 205 #ifdef HAVE_IPV6 206 v6_addr = in6addr_loopback; 207 #endif 208 } 209 210 #ifdef HAVE_IPV6 211 if (family == PF_INET6 || family == PF_UNSPEC) { 212 ret = add_one (port, protocol, socktype, 213 ¤t, const_v6, &v6_addr, NULL); 214 } 215 #endif 216 if (family == PF_INET || family == PF_UNSPEC) { 217 ret = add_one (port, protocol, socktype, 218 ¤t, const_v4, &v4_addr, NULL); 219 } 220 *res = first; 221 return 0; 222 } 223 224 static int 225 add_hostent (int port, int protocol, int socktype, 226 struct addrinfo ***current, 227 int (*func)(struct addrinfo *, void *data, int port), 228 struct hostent *he, int *flags) 229 { 230 int ret; 231 char *canonname = NULL; 232 char **h; 233 234 if (*flags & AI_CANONNAME) { 235 struct hostent *he2 = NULL; 236 const char *tmp_canon; 237 238 tmp_canon = hostent_find_fqdn (he); 239 if (strchr (tmp_canon, '.') == NULL) { 240 int error; 241 242 he2 = getipnodebyaddr (he->h_addr_list[0], he->h_length, 243 he->h_addrtype, &error); 244 if (he2 != NULL) { 245 const char *tmp = hostent_find_fqdn (he2); 246 247 if (strchr (tmp, '.') != NULL) 248 tmp_canon = tmp; 249 } 250 } 251 252 canonname = strdup (tmp_canon); 253 if (he2 != NULL) 254 freehostent (he2); 255 if (canonname == NULL) 256 return EAI_MEMORY; 257 } 258 259 for (h = he->h_addr_list; *h != NULL; ++h) { 260 ret = add_one (port, protocol, socktype, 261 current, func, *h, canonname); 262 if (ret) 263 return ret; 264 if (*flags & AI_CANONNAME) { 265 *flags &= ~AI_CANONNAME; 266 canonname = NULL; 267 } 268 } 269 return 0; 270 } 271 272 static int 273 get_number (const char *nodename, 274 const struct addrinfo *hints, 275 int port, int protocol, int socktype, 276 struct addrinfo **res) 277 { 278 struct addrinfo *first = NULL; 279 struct addrinfo **current = &first; 280 int family = PF_UNSPEC; 281 int ret; 282 283 if (hints != NULL) { 284 family = hints->ai_family; 285 } 286 287 #ifdef HAVE_IPV6 288 if (family == PF_INET6 || family == PF_UNSPEC) { 289 struct in6_addr v6_addr; 290 291 if (inet_pton (PF_INET6, nodename, &v6_addr) == 1) { 292 ret = add_one (port, protocol, socktype, 293 ¤t, const_v6, &v6_addr, NULL); 294 *res = first; 295 return ret; 296 } 297 } 298 #endif 299 if (family == PF_INET || family == PF_UNSPEC) { 300 struct in_addr v4_addr; 301 302 if (inet_pton (PF_INET, nodename, &v4_addr) == 1) { 303 ret = add_one (port, protocol, socktype, 304 ¤t, const_v4, &v4_addr, NULL); 305 *res = first; 306 return ret; 307 } 308 } 309 return EAI_NONAME; 310 } 311 312 static int 313 get_nodes (const char *nodename, 314 const struct addrinfo *hints, 315 int port, int protocol, int socktype, 316 struct addrinfo **res) 317 { 318 struct addrinfo *first = NULL; 319 struct addrinfo **current = &first; 320 int family = PF_UNSPEC; 321 int flags = 0; 322 int ret = EAI_NONAME; 323 int error; 324 325 if (hints != NULL) { 326 family = hints->ai_family; 327 flags = hints->ai_flags; 328 } 329 330 #ifdef HAVE_IPV6 331 if (family == PF_INET6 || family == PF_UNSPEC) { 332 struct hostent *he; 333 334 he = getipnodebyname (nodename, PF_INET6, 0, &error); 335 336 if (he != NULL) { 337 ret = add_hostent (port, protocol, socktype, 338 ¤t, const_v6, he, &flags); 339 freehostent (he); 340 } 341 } 342 #endif 343 if (family == PF_INET || family == PF_UNSPEC) { 344 struct hostent *he; 345 346 he = getipnodebyname (nodename, PF_INET, 0, &error); 347 348 if (he != NULL) { 349 ret = add_hostent (port, protocol, socktype, 350 ¤t, const_v4, he, &flags); 351 freehostent (he); 352 } 353 } 354 *res = first; 355 return ret; 356 } 357 358 /* 359 * hints: 360 * 361 * struct addrinfo { 362 * int ai_flags; 363 * int ai_family; 364 * int ai_socktype; 365 * int ai_protocol; 366 * ... 367 * }; 368 */ 369 370 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL 371 getaddrinfo(const char *nodename, 372 const char *servname, 373 const struct addrinfo *hints, 374 struct addrinfo **res) 375 { 376 int ret; 377 int port = 0; 378 int protocol = 0; 379 int socktype = 0; 380 381 *res = NULL; 382 383 if (servname == NULL && nodename == NULL) 384 return EAI_NONAME; 385 386 if (hints != NULL 387 && hints->ai_family != PF_UNSPEC 388 && hints->ai_family != PF_INET 389 #ifdef HAVE_IPV6 390 && hints->ai_family != PF_INET6 391 #endif 392 ) 393 return EAI_FAMILY; 394 395 if (servname != NULL) { 396 ret = get_port_protocol_socktype (servname, hints, 397 &port, &protocol, &socktype); 398 if (ret) 399 return ret; 400 } 401 if (nodename != NULL) { 402 ret = get_number (nodename, hints, port, protocol, socktype, res); 403 if (ret) { 404 if(hints && hints->ai_flags & AI_NUMERICHOST) 405 ret = EAI_NONAME; 406 else 407 ret = get_nodes (nodename, hints, port, protocol, socktype, 408 res); 409 } 410 } else { 411 ret = get_null (hints, port, protocol, socktype, res); 412 } 413 if (ret) 414 freeaddrinfo (*res); 415 return ret; 416 } 417