| 1 | /* Get address information (partial implementation). |
| 2 | Copyright (C) 1997, 2001-2002, 2004-2014 Free Software Foundation, Inc. |
| 3 | Contributed by Simon Josefsson <simon@josefsson.org>. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU Lesser General Public License as published by |
| 7 | the Free Software Foundation; either version 2, or (at your option) |
| 8 | any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public License |
| 16 | along with this program; if not, see <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | /* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc |
| 19 | optimizes away the sa == NULL test below. */ |
| 20 | #define _GL_ARG_NONNULL(params) |
| 21 | |
| 22 | #include <config.h> |
| 23 | |
| 24 | #include <netdb.h> |
| 25 | |
| 26 | #if HAVE_NETINET_IN_H |
| 27 | # include <netinet/in.h> |
| 28 | #endif |
| 29 | |
| 30 | /* Get inet_ntop. */ |
| 31 | #include <arpa/inet.h> |
| 32 | |
| 33 | /* Get calloc. */ |
| 34 | #include <stdlib.h> |
| 35 | |
| 36 | /* Get memcpy, strdup. */ |
| 37 | #include <string.h> |
| 38 | |
| 39 | /* Get snprintf. */ |
| 40 | #include <stdio.h> |
| 41 | |
| 42 | #include <stdbool.h> |
| 43 | |
| 44 | #include "gettext.h" |
| 45 | #define _(String) gettext (String) |
| 46 | #define N_(String) String |
| 47 | |
| 48 | /* BeOS has AF_INET, but not PF_INET. */ |
| 49 | #ifndef PF_INET |
| 50 | # define PF_INET AF_INET |
| 51 | #endif |
| 52 | /* BeOS also lacks PF_UNSPEC. */ |
| 53 | #ifndef PF_UNSPEC |
| 54 | # define PF_UNSPEC 0 |
| 55 | #endif |
| 56 | |
| 57 | #if defined _WIN32 || defined __WIN32__ |
| 58 | # define WINDOWS_NATIVE |
| 59 | #endif |
| 60 | |
| 61 | /* gl_sockets_startup */ |
| 62 | #include "sockets.h" |
| 63 | |
| 64 | #ifdef WINDOWS_NATIVE |
| 65 | typedef int (WSAAPI *getaddrinfo_func) (const char*, const char*, |
| 66 | const struct addrinfo*, |
| 67 | struct addrinfo**); |
| 68 | typedef void (WSAAPI *freeaddrinfo_func) (struct addrinfo*); |
| 69 | typedef int (WSAAPI *getnameinfo_func) (const struct sockaddr*, |
| 70 | socklen_t, char*, DWORD, |
| 71 | char*, DWORD, int); |
| 72 | |
| 73 | static getaddrinfo_func getaddrinfo_ptr = NULL; |
| 74 | static freeaddrinfo_func freeaddrinfo_ptr = NULL; |
| 75 | static getnameinfo_func getnameinfo_ptr = NULL; |
| 76 | |
| 77 | static int |
| 78 | use_win32_p (void) |
| 79 | { |
| 80 | static int done = 0; |
| 81 | HMODULE h; |
| 82 | |
| 83 | if (done) |
| 84 | return getaddrinfo_ptr ? 1 : 0; |
| 85 | |
| 86 | done = 1; |
| 87 | |
| 88 | h = GetModuleHandle ("ws2_32.dll"); |
| 89 | |
| 90 | if (h) |
| 91 | { |
| 92 | getaddrinfo_ptr = (getaddrinfo_func) GetProcAddress (h, "getaddrinfo"); |
| 93 | freeaddrinfo_ptr = (freeaddrinfo_func) GetProcAddress (h, "freeaddrinfo"); |
| 94 | getnameinfo_ptr = (getnameinfo_func) GetProcAddress (h, "getnameinfo"); |
| 95 | } |
| 96 | |
| 97 | /* If either is missing, something is odd. */ |
| 98 | if (!getaddrinfo_ptr || !freeaddrinfo_ptr || !getnameinfo_ptr) |
| 99 | { |
| 100 | getaddrinfo_ptr = NULL; |
| 101 | freeaddrinfo_ptr = NULL; |
| 102 | getnameinfo_ptr = NULL; |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | gl_sockets_startup (SOCKETS_1_1); |
| 107 | |
| 108 | return 1; |
| 109 | } |
| 110 | #endif |
| 111 | |
| 112 | static bool |
| 113 | validate_family (int family) |
| 114 | { |
| 115 | /* FIXME: Support more families. */ |
| 116 | #if HAVE_IPV4 |
| 117 | if (family == PF_INET) |
| 118 | return true; |
| 119 | #endif |
| 120 | #if HAVE_IPV6 |
| 121 | if (family == PF_INET6) |
| 122 | return true; |
| 123 | #endif |
| 124 | if (family == PF_UNSPEC) |
| 125 | return true; |
| 126 | return false; |
| 127 | } |
| 128 | |
| 129 | /* Translate name of a service location and/or a service name to set of |
| 130 | socket addresses. */ |
| 131 | int |
| 132 | getaddrinfo (const char *restrict nodename, |
| 133 | const char *restrict servname, |
| 134 | const struct addrinfo *restrict hints, |
| 135 | struct addrinfo **restrict res) |
| 136 | { |
| 137 | struct addrinfo *tmp; |
| 138 | int port = 0; |
| 139 | struct hostent *he; |
| 140 | void *storage; |
| 141 | size_t size; |
| 142 | #if HAVE_IPV6 |
| 143 | struct v6_pair { |
| 144 | struct addrinfo addrinfo; |
| 145 | struct sockaddr_in6 sockaddr_in6; |
| 146 | }; |
| 147 | #endif |
| 148 | #if HAVE_IPV4 |
| 149 | struct v4_pair { |
| 150 | struct addrinfo addrinfo; |
| 151 | struct sockaddr_in sockaddr_in; |
| 152 | }; |
| 153 | #endif |
| 154 | |
| 155 | #ifdef WINDOWS_NATIVE |
| 156 | if (use_win32_p ()) |
| 157 | return getaddrinfo_ptr (nodename, servname, hints, res); |
| 158 | #endif |
| 159 | |
| 160 | if (hints && (hints->ai_flags & ~(AI_CANONNAME|AI_PASSIVE))) |
| 161 | /* FIXME: Support more flags. */ |
| 162 | return EAI_BADFLAGS; |
| 163 | |
| 164 | if (hints && !validate_family (hints->ai_family)) |
| 165 | return EAI_FAMILY; |
| 166 | |
| 167 | if (hints && |
| 168 | hints->ai_socktype != SOCK_STREAM && hints->ai_socktype != SOCK_DGRAM) |
| 169 | /* FIXME: Support other socktype. */ |
| 170 | return EAI_SOCKTYPE; /* FIXME: Better return code? */ |
| 171 | |
| 172 | if (!nodename) |
| 173 | { |
| 174 | if (!(hints->ai_flags & AI_PASSIVE)) |
| 175 | return EAI_NONAME; |
| 176 | |
| 177 | #ifdef HAVE_IPV6 |
| 178 | nodename = (hints->ai_family == AF_INET6) ? "::" : "0.0.0.0"; |
| 179 | #else |
| 180 | nodename = "0.0.0.0"; |
| 181 | #endif |
| 182 | } |
| 183 | |
| 184 | if (servname) |
| 185 | { |
| 186 | struct servent *se = NULL; |
| 187 | const char *proto = |
| 188 | (hints && hints->ai_socktype == SOCK_DGRAM) ? "udp" : "tcp"; |
| 189 | |
| 190 | if (hints == NULL || !(hints->ai_flags & AI_NUMERICSERV)) |
| 191 | /* FIXME: Use getservbyname_r if available. */ |
| 192 | se = getservbyname (servname, proto); |
| 193 | |
| 194 | if (!se) |
| 195 | { |
| 196 | char *c; |
| 197 | if (!(*servname >= '0' && *servname <= '9')) |
| 198 | return EAI_NONAME; |
| 199 | port = strtoul (servname, &c, 10); |
| 200 | if (*c || port > 0xffff) |
| 201 | return EAI_NONAME; |
| 202 | port = htons (port); |
| 203 | } |
| 204 | else |
| 205 | port = se->s_port; |
| 206 | } |
| 207 | |
| 208 | /* FIXME: Use gethostbyname_r if available. */ |
| 209 | he = gethostbyname (nodename); |
| 210 | if (!he || he->h_addr_list[0] == NULL) |
| 211 | return EAI_NONAME; |
| 212 | |
| 213 | switch (he->h_addrtype) |
| 214 | { |
| 215 | #if HAVE_IPV6 |
| 216 | case PF_INET6: |
| 217 | size = sizeof (struct v6_pair); |
| 218 | break; |
| 219 | #endif |
| 220 | |
| 221 | #if HAVE_IPV4 |
| 222 | case PF_INET: |
| 223 | size = sizeof (struct v4_pair); |
| 224 | break; |
| 225 | #endif |
| 226 | |
| 227 | default: |
| 228 | return EAI_NODATA; |
| 229 | } |
| 230 | |
| 231 | storage = calloc (1, size); |
| 232 | if (!storage) |
| 233 | return EAI_MEMORY; |
| 234 | |
| 235 | switch (he->h_addrtype) |
| 236 | { |
| 237 | #if HAVE_IPV6 |
| 238 | case PF_INET6: |
| 239 | { |
| 240 | struct v6_pair *p = storage; |
| 241 | struct sockaddr_in6 *sinp = &p->sockaddr_in6; |
| 242 | tmp = &p->addrinfo; |
| 243 | |
| 244 | if (port) |
| 245 | sinp->sin6_port = port; |
| 246 | |
| 247 | if (he->h_length != sizeof (sinp->sin6_addr)) |
| 248 | { |
| 249 | free (storage); |
| 250 | return EAI_SYSTEM; /* FIXME: Better return code? Set errno? */ |
| 251 | } |
| 252 | |
| 253 | memcpy (&sinp->sin6_addr, he->h_addr_list[0], sizeof sinp->sin6_addr); |
| 254 | |
| 255 | tmp->ai_addr = (struct sockaddr *) sinp; |
| 256 | tmp->ai_addrlen = sizeof *sinp; |
| 257 | } |
| 258 | break; |
| 259 | #endif |
| 260 | |
| 261 | #if HAVE_IPV4 |
| 262 | case PF_INET: |
| 263 | { |
| 264 | struct v4_pair *p = storage; |
| 265 | struct sockaddr_in *sinp = &p->sockaddr_in; |
| 266 | tmp = &p->addrinfo; |
| 267 | |
| 268 | if (port) |
| 269 | sinp->sin_port = port; |
| 270 | |
| 271 | if (he->h_length != sizeof (sinp->sin_addr)) |
| 272 | { |
| 273 | free (storage); |
| 274 | return EAI_SYSTEM; /* FIXME: Better return code? Set errno? */ |
| 275 | } |
| 276 | |
| 277 | memcpy (&sinp->sin_addr, he->h_addr_list[0], sizeof sinp->sin_addr); |
| 278 | |
| 279 | tmp->ai_addr = (struct sockaddr *) sinp; |
| 280 | tmp->ai_addrlen = sizeof *sinp; |
| 281 | } |
| 282 | break; |
| 283 | #endif |
| 284 | |
| 285 | default: |
| 286 | free (storage); |
| 287 | return EAI_NODATA; |
| 288 | } |
| 289 | |
| 290 | if (hints && hints->ai_flags & AI_CANONNAME) |
| 291 | { |
| 292 | const char *cn; |
| 293 | if (he->h_name) |
| 294 | cn = he->h_name; |
| 295 | else |
| 296 | cn = nodename; |
| 297 | |
| 298 | tmp->ai_canonname = strdup (cn); |
| 299 | if (!tmp->ai_canonname) |
| 300 | { |
| 301 | free (storage); |
| 302 | return EAI_MEMORY; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | tmp->ai_protocol = (hints) ? hints->ai_protocol : 0; |
| 307 | tmp->ai_socktype = (hints) ? hints->ai_socktype : 0; |
| 308 | tmp->ai_addr->sa_family = he->h_addrtype; |
| 309 | tmp->ai_family = he->h_addrtype; |
| 310 | |
| 311 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN |
| 312 | switch (he->h_addrtype) |
| 313 | { |
| 314 | #if HAVE_IPV4 |
| 315 | case AF_INET: |
| 316 | tmp->ai_addr->sa_len = sizeof (struct sockaddr_in); |
| 317 | break; |
| 318 | #endif |
| 319 | #if HAVE_IPV6 |
| 320 | case AF_INET6: |
| 321 | tmp->ai_addr->sa_len = sizeof (struct sockaddr_in6); |
| 322 | break; |
| 323 | #endif |
| 324 | } |
| 325 | #endif |
| 326 | |
| 327 | /* FIXME: If more than one address, create linked list of addrinfo's. */ |
| 328 | |
| 329 | *res = tmp; |
| 330 | |
| 331 | return 0; |
| 332 | } |
| 333 | |
| 334 | /* Free 'addrinfo' structure AI including associated storage. */ |
| 335 | void |
| 336 | freeaddrinfo (struct addrinfo *ai) |
| 337 | { |
| 338 | #ifdef WINDOWS_NATIVE |
| 339 | if (use_win32_p ()) |
| 340 | { |
| 341 | freeaddrinfo_ptr (ai); |
| 342 | return; |
| 343 | } |
| 344 | #endif |
| 345 | |
| 346 | while (ai) |
| 347 | { |
| 348 | struct addrinfo *cur; |
| 349 | |
| 350 | cur = ai; |
| 351 | ai = ai->ai_next; |
| 352 | |
| 353 | free (cur->ai_canonname); |
| 354 | free (cur); |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | int |
| 359 | getnameinfo (const struct sockaddr *restrict sa, socklen_t salen, |
| 360 | char *restrict node, socklen_t nodelen, |
| 361 | char *restrict service, socklen_t servicelen, |
| 362 | int flags) |
| 363 | { |
| 364 | #ifdef WINDOWS_NATIVE |
| 365 | if (use_win32_p ()) |
| 366 | return getnameinfo_ptr (sa, salen, node, nodelen, |
| 367 | service, servicelen, flags); |
| 368 | #endif |
| 369 | |
| 370 | /* FIXME: Support other flags. */ |
| 371 | if ((node && nodelen > 0 && !(flags & NI_NUMERICHOST)) || |
| 372 | (service && servicelen > 0 && !(flags & NI_NUMERICHOST)) || |
| 373 | (flags & ~(NI_NUMERICHOST|NI_NUMERICSERV))) |
| 374 | return EAI_BADFLAGS; |
| 375 | |
| 376 | if (sa == NULL || salen < sizeof (sa->sa_family)) |
| 377 | return EAI_FAMILY; |
| 378 | |
| 379 | switch (sa->sa_family) |
| 380 | { |
| 381 | #if HAVE_IPV4 |
| 382 | case AF_INET: |
| 383 | if (salen < sizeof (struct sockaddr_in)) |
| 384 | return EAI_FAMILY; |
| 385 | break; |
| 386 | #endif |
| 387 | #if HAVE_IPV6 |
| 388 | case AF_INET6: |
| 389 | if (salen < sizeof (struct sockaddr_in6)) |
| 390 | return EAI_FAMILY; |
| 391 | break; |
| 392 | #endif |
| 393 | default: |
| 394 | return EAI_FAMILY; |
| 395 | } |
| 396 | |
| 397 | if (node && nodelen > 0 && flags & NI_NUMERICHOST) |
| 398 | { |
| 399 | switch (sa->sa_family) |
| 400 | { |
| 401 | #if HAVE_IPV4 |
| 402 | case AF_INET: |
| 403 | if (!inet_ntop (AF_INET, |
| 404 | &(((const struct sockaddr_in *) sa)->sin_addr), |
| 405 | node, nodelen)) |
| 406 | return EAI_SYSTEM; |
| 407 | break; |
| 408 | #endif |
| 409 | |
| 410 | #if HAVE_IPV6 |
| 411 | case AF_INET6: |
| 412 | if (!inet_ntop (AF_INET6, |
| 413 | &(((const struct sockaddr_in6 *) sa)->sin6_addr), |
| 414 | node, nodelen)) |
| 415 | return EAI_SYSTEM; |
| 416 | break; |
| 417 | #endif |
| 418 | |
| 419 | default: |
| 420 | return EAI_FAMILY; |
| 421 | } |
| 422 | } |
| 423 | |
| 424 | if (service && servicelen > 0 && flags & NI_NUMERICSERV) |
| 425 | switch (sa->sa_family) |
| 426 | { |
| 427 | #if HAVE_IPV4 |
| 428 | case AF_INET: |
| 429 | #endif |
| 430 | #if HAVE_IPV6 |
| 431 | case AF_INET6: |
| 432 | #endif |
| 433 | { |
| 434 | unsigned short int port |
| 435 | = ntohs (((const struct sockaddr_in *) sa)->sin_port); |
| 436 | if (servicelen <= snprintf (service, servicelen, "%u", port)) |
| 437 | return EAI_OVERFLOW; |
| 438 | } |
| 439 | break; |
| 440 | } |
| 441 | |
| 442 | return 0; |
| 443 | } |