1 /* 2 * Copyright (c) 1999 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 1.6 1999/12/20 00:56:44 assar 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 static int 176 get_null (const struct addrinfo *hints, 177 int port, int protocol, int socktype, 178 struct addrinfo **res) 179 { 180 struct in_addr v4_addr; 181 #ifdef HAVE_IPV6 182 struct in6_addr v6_addr; 183 #endif 184 struct addrinfo *first = NULL; 185 struct addrinfo **current = &first; 186 int family = PF_UNSPEC; 187 int ret; 188 189 if (hints != NULL) 190 family = hints->ai_family; 191 192 if (hints && hints->ai_flags & AI_PASSIVE) { 193 v4_addr.s_addr = INADDR_ANY; 194 #ifdef HAVE_IPV6 195 v6_addr = in6addr_any; 196 #endif 197 } else { 198 v4_addr.s_addr = htonl(INADDR_LOOPBACK); 199 #ifdef HAVE_IPV6 200 v6_addr = in6addr_loopback; 201 #endif 202 } 203 204 #ifdef HAVE_IPV6 205 if (family == PF_INET6 || family == PF_UNSPEC) { 206 ret = add_one (port, protocol, socktype, 207 ¤t, const_v6, &v6_addr, NULL); 208 } 209 #endif 210 if (family == PF_INET || family == PF_UNSPEC) { 211 ret = add_one (port, protocol, socktype, 212 ¤t, const_v4, &v4_addr, NULL); 213 } 214 *res = first; 215 return 0; 216 } 217 218 static int 219 add_hostent (int port, int protocol, int socktype, 220 struct addrinfo ***current, 221 int (*func)(struct addrinfo *, void *data, int port), 222 struct hostent *he, int *flags) 223 { 224 char **h; 225 int ret; 226 char *canonname = NULL; 227 228 if (*flags & AI_CANONNAME) { 229 canonname = he->h_name; 230 231 if (strchr (he->h_name, '.') == NULL) 232 for (h = he->h_aliases; *h; ++h) { 233 if (strchr (*h, '.') != NULL) { 234 canonname = *h; 235 break; 236 } 237 } 238 canonname = strdup (canonname); 239 if (canonname == NULL) 240 return EAI_MEMORY; 241 } 242 243 for (h = he->h_addr_list; *h != NULL; ++h) { 244 ret = add_one (port, protocol, socktype, 245 current, func, *h, canonname); 246 if (ret) 247 return ret; 248 if (*flags & AI_CANONNAME) { 249 *flags &= ~AI_CANONNAME; 250 canonname = NULL; 251 } 252 } 253 return 0; 254 } 255 256 static int 257 get_number (const char *nodename, 258 const struct addrinfo *hints, 259 int port, int protocol, int socktype, 260 struct addrinfo **res) 261 { 262 struct addrinfo *first = NULL; 263 struct addrinfo **current = &first; 264 int family = PF_UNSPEC; 265 int ret; 266 267 if (hints != NULL) { 268 family = hints->ai_family; 269 } 270 271 #ifdef HAVE_IPV6 272 if (family == PF_INET6 || family == PF_UNSPEC) { 273 struct in6_addr v6_addr; 274 275 if (inet_pton (PF_INET6, nodename, &v6_addr) == 1) { 276 ret = add_one (port, protocol, socktype, 277 ¤t, const_v6, &v6_addr, NULL); 278 *res = first; 279 return ret; 280 } 281 } 282 #endif 283 if (family == PF_INET || family == PF_UNSPEC) { 284 struct in_addr v4_addr; 285 286 if (inet_pton (PF_INET, nodename, &v4_addr) == 1) { 287 ret = add_one (port, protocol, socktype, 288 ¤t, const_v4, &v4_addr, NULL); 289 *res = first; 290 return ret; 291 } 292 } 293 return EAI_NONAME; 294 } 295 296 static int 297 get_nodes (const char *nodename, 298 const struct addrinfo *hints, 299 int port, int protocol, int socktype, 300 struct addrinfo **res) 301 { 302 struct addrinfo *first = NULL; 303 struct addrinfo **current = &first; 304 int family = PF_UNSPEC; 305 int flags = 0; 306 int ret = EAI_NONAME; 307 int error; 308 309 if (hints != NULL) { 310 family = hints->ai_family; 311 flags = hints->ai_flags; 312 } 313 314 #ifdef HAVE_IPV6 315 if (family == PF_INET6 || family == PF_UNSPEC) { 316 struct hostent *he; 317 318 he = getipnodebyname (nodename, PF_INET6, 0, &error); 319 320 if (he != NULL) { 321 ret = add_hostent (port, protocol, socktype, 322 ¤t, const_v6, he, &flags); 323 freehostent (he); 324 } 325 } 326 #endif 327 if (family == PF_INET || family == PF_UNSPEC) { 328 struct hostent *he; 329 330 he = getipnodebyname (nodename, PF_INET, 0, &error); 331 332 if (he != NULL) { 333 ret = add_hostent (port, protocol, socktype, 334 ¤t, const_v4, he, &flags); 335 freehostent (he); 336 } 337 } 338 *res = first; 339 return ret; 340 } 341 342 /* 343 * hints: 344 * 345 * struct addrinfo { 346 * int ai_flags; 347 * int ai_family; 348 * int ai_socktype; 349 * int ai_protocol; 350 * ... 351 * }; 352 */ 353 354 int 355 getaddrinfo(const char *nodename, 356 const char *servname, 357 const struct addrinfo *hints, 358 struct addrinfo **res) 359 { 360 int ret; 361 int port = 0; 362 int protocol = 0; 363 int socktype = 0; 364 365 *res = NULL; 366 367 if (servname == NULL && nodename == NULL) 368 return EAI_NONAME; 369 370 if (hints != NULL 371 && hints->ai_family != PF_UNSPEC 372 && hints->ai_family != PF_INET 373 #ifdef HAVE_IPV6 374 && hints->ai_family != PF_INET6 375 #endif 376 ) 377 return EAI_FAMILY; 378 379 if (servname != NULL) { 380 ret = get_port_protocol_socktype (servname, hints, 381 &port, &protocol, &socktype); 382 if (ret) 383 return ret; 384 } 385 if (nodename != NULL) { 386 ret = get_number (nodename, hints, port, protocol, socktype, res); 387 if (ret) { 388 if(hints && hints->ai_flags & AI_NUMERICHOST) 389 ret = EAI_NONAME; 390 else 391 ret = get_nodes (nodename, hints, port, protocol, socktype, 392 res); 393 } 394 } else { 395 ret = get_null (hints, port, protocol, socktype, res); 396 } 397 if (ret) 398 freeaddrinfo (*res); 399 return ret; 400 } 401