| 1 | /* |
| 2 | PostgreSQL Database Management System |
| 3 | (formerly known as Postgres, then as Postgres95) |
| 4 | |
| 5 | Portions Copyright (c) 1996-2005, The PostgreSQL Global Development Group |
| 6 | |
| 7 | Portions Copyright (c) 1994, The Regents of the University of California |
| 8 | |
| 9 | Permission to use, copy, modify, and distribute this software and its |
| 10 | documentation for any purpose, without fee, and without a written agreement |
| 11 | is hereby granted, provided that the above copyright notice and this paragraph |
| 12 | and the following two paragraphs appear in all copies. |
| 13 | |
| 14 | IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR |
| 15 | DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING |
| 16 | LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, |
| 17 | EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF |
| 18 | SUCH DAMAGE. |
| 19 | |
| 20 | THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, |
| 21 | INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
| 22 | AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
| 23 | ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS |
| 24 | TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| 25 | |
| 26 | */ |
| 27 | |
| 28 | /*------------------------------------------------------------------------- |
| 29 | * |
| 30 | * getaddrinfo.c |
| 31 | * Support getaddrinfo() on platforms that don't have it. |
| 32 | * |
| 33 | * We also supply getnameinfo() here, assuming that the platform will have |
| 34 | * it if and only if it has getaddrinfo(). If this proves false on some |
| 35 | * platform, we'll need to split this file and provide a separate configure |
| 36 | * test for getnameinfo(). |
| 37 | * |
| 38 | * Copyright (c) 2003-2007, PostgreSQL Global Development Group |
| 39 | * |
| 40 | * Copyright (C) 2007 Jeremy Allison. |
| 41 | * Modified to return multiple IPv4 addresses for Samba. |
| 42 | * |
| 43 | *------------------------------------------------------------------------- |
| 44 | */ |
| 45 | |
| 46 | #include "rsync.h" |
| 47 | |
| 48 | #ifndef SMB_MALLOC |
| 49 | #define SMB_MALLOC(s) malloc(s) |
| 50 | #endif |
| 51 | |
| 52 | #ifndef SMB_STRDUP |
| 53 | #define SMB_STRDUP(s) strdup(s) |
| 54 | #endif |
| 55 | |
| 56 | #ifndef HOST_NAME_MAX |
| 57 | #define HOST_NAME_MAX 255 |
| 58 | #endif |
| 59 | |
| 60 | static int check_hostent_err(struct hostent *hp) |
| 61 | { |
| 62 | #ifndef INET6 |
| 63 | extern int h_errno; |
| 64 | #endif |
| 65 | if (!hp) { |
| 66 | switch (h_errno) { |
| 67 | case HOST_NOT_FOUND: |
| 68 | case NO_DATA: |
| 69 | return EAI_NONAME; |
| 70 | case TRY_AGAIN: |
| 71 | return EAI_AGAIN; |
| 72 | case NO_RECOVERY: |
| 73 | default: |
| 74 | return EAI_FAIL; |
| 75 | } |
| 76 | } |
| 77 | if (!hp->h_name || hp->h_addrtype != AF_INET) { |
| 78 | return EAI_FAIL; |
| 79 | } |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | static char *canon_name_from_hostent(struct hostent *hp, |
| 84 | int *perr) |
| 85 | { |
| 86 | char *ret = NULL; |
| 87 | |
| 88 | *perr = check_hostent_err(hp); |
| 89 | if (*perr) { |
| 90 | return NULL; |
| 91 | } |
| 92 | ret = SMB_STRDUP(hp->h_name); |
| 93 | if (!ret) { |
| 94 | *perr = EAI_MEMORY; |
| 95 | } |
| 96 | return ret; |
| 97 | } |
| 98 | |
| 99 | static char *get_my_canon_name(int *perr) |
| 100 | { |
| 101 | char name[HOST_NAME_MAX+1]; |
| 102 | |
| 103 | if (gethostname(name, HOST_NAME_MAX) == -1) { |
| 104 | *perr = EAI_FAIL; |
| 105 | return NULL; |
| 106 | } |
| 107 | /* Ensure null termination. */ |
| 108 | name[HOST_NAME_MAX] = '\0'; |
| 109 | return canon_name_from_hostent(gethostbyname(name), perr); |
| 110 | } |
| 111 | |
| 112 | static char *get_canon_name_from_addr(struct in_addr ip, |
| 113 | int *perr) |
| 114 | { |
| 115 | return canon_name_from_hostent( |
| 116 | gethostbyaddr((void *)&ip, sizeof ip, AF_INET), |
| 117 | perr); |
| 118 | } |
| 119 | |
| 120 | static struct addrinfo *alloc_entry(const struct addrinfo *hints, |
| 121 | struct in_addr ip, |
| 122 | unsigned short port) |
| 123 | { |
| 124 | struct sockaddr_in *psin = NULL; |
| 125 | struct addrinfo *ai = SMB_MALLOC(sizeof(*ai)); |
| 126 | |
| 127 | if (!ai) { |
| 128 | return NULL; |
| 129 | } |
| 130 | memset(ai, '\0', sizeof(*ai)); |
| 131 | |
| 132 | psin = SMB_MALLOC(sizeof(*psin)); |
| 133 | if (!psin) { |
| 134 | free(ai); |
| 135 | return NULL; |
| 136 | } |
| 137 | |
| 138 | memset(psin, '\0', sizeof(*psin)); |
| 139 | |
| 140 | psin->sin_family = AF_INET; |
| 141 | psin->sin_port = htons(port); |
| 142 | psin->sin_addr = ip; |
| 143 | |
| 144 | ai->ai_flags = 0; |
| 145 | ai->ai_family = AF_INET; |
| 146 | ai->ai_socktype = hints->ai_socktype; |
| 147 | ai->ai_protocol = hints->ai_protocol; |
| 148 | ai->ai_addrlen = sizeof(*psin); |
| 149 | ai->ai_addr = (struct sockaddr *) psin; |
| 150 | ai->ai_canonname = NULL; |
| 151 | ai->ai_next = NULL; |
| 152 | |
| 153 | return ai; |
| 154 | } |
| 155 | |
| 156 | /* |
| 157 | * get address info for a single ipv4 address. |
| 158 | * |
| 159 | * Bugs: - servname can only be a number, not text. |
| 160 | */ |
| 161 | |
| 162 | static int getaddr_info_single_addr(const char *service, |
| 163 | uint32 addr, |
| 164 | const struct addrinfo *hints, |
| 165 | struct addrinfo **res) |
| 166 | { |
| 167 | |
| 168 | struct addrinfo *ai = NULL; |
| 169 | struct in_addr ip; |
| 170 | unsigned short port = 0; |
| 171 | |
| 172 | if (service) { |
| 173 | port = (unsigned short)atoi(service); |
| 174 | } |
| 175 | ip.s_addr = htonl(addr); |
| 176 | |
| 177 | ai = alloc_entry(hints, ip, port); |
| 178 | if (!ai) { |
| 179 | return EAI_MEMORY; |
| 180 | } |
| 181 | |
| 182 | /* If we're asked for the canonical name, |
| 183 | * make sure it returns correctly. */ |
| 184 | if (!(hints->ai_flags & AI_NUMERICSERV) && |
| 185 | hints->ai_flags & AI_CANONNAME) { |
| 186 | int err; |
| 187 | if (addr == INADDR_LOOPBACK || addr == INADDR_ANY) { |
| 188 | ai->ai_canonname = get_my_canon_name(&err); |
| 189 | } else { |
| 190 | ai->ai_canonname = |
| 191 | get_canon_name_from_addr(ip,&err); |
| 192 | } |
| 193 | if (ai->ai_canonname == NULL) { |
| 194 | freeaddrinfo(ai); |
| 195 | return err; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | *res = ai; |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * get address info for multiple ipv4 addresses. |
| 205 | * |
| 206 | * Bugs: - servname can only be a number, not text. |
| 207 | */ |
| 208 | |
| 209 | static int getaddr_info_name(const char *node, |
| 210 | const char *service, |
| 211 | const struct addrinfo *hints, |
| 212 | struct addrinfo **res) |
| 213 | { |
| 214 | struct addrinfo *listp = NULL, *prevp = NULL; |
| 215 | char **pptr = NULL; |
| 216 | int err; |
| 217 | struct hostent *hp = NULL; |
| 218 | unsigned short port = 0; |
| 219 | |
| 220 | if (service) { |
| 221 | port = (unsigned short)atoi(service); |
| 222 | } |
| 223 | |
| 224 | hp = gethostbyname(node); |
| 225 | err = check_hostent_err(hp); |
| 226 | if (err) { |
| 227 | return err; |
| 228 | } |
| 229 | |
| 230 | for(pptr = hp->h_addr_list; *pptr; pptr++) { |
| 231 | struct in_addr ip = *(struct in_addr *)*pptr; |
| 232 | struct addrinfo *ai = alloc_entry(hints, ip, port); |
| 233 | |
| 234 | if (!ai) { |
| 235 | freeaddrinfo(listp); |
| 236 | return EAI_MEMORY; |
| 237 | } |
| 238 | |
| 239 | if (!listp) { |
| 240 | listp = ai; |
| 241 | prevp = ai; |
| 242 | ai->ai_canonname = SMB_STRDUP(hp->h_name); |
| 243 | if (!ai->ai_canonname) { |
| 244 | freeaddrinfo(listp); |
| 245 | return EAI_MEMORY; |
| 246 | } |
| 247 | } else { |
| 248 | prevp->ai_next = ai; |
| 249 | prevp = ai; |
| 250 | } |
| 251 | } |
| 252 | *res = listp; |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * get address info for ipv4 sockets. |
| 258 | * |
| 259 | * Bugs: - servname can only be a number, not text. |
| 260 | */ |
| 261 | |
| 262 | int getaddrinfo(const char *node, |
| 263 | const char *service, |
| 264 | const struct addrinfo * hintp, |
| 265 | struct addrinfo ** res) |
| 266 | { |
| 267 | struct addrinfo hints; |
| 268 | |
| 269 | /* Setup the hints struct. */ |
| 270 | if (hintp == NULL) { |
| 271 | memset(&hints, 0, sizeof(hints)); |
| 272 | hints.ai_family = AF_INET; |
| 273 | hints.ai_socktype = SOCK_STREAM; |
| 274 | } else { |
| 275 | memcpy(&hints, hintp, sizeof(hints)); |
| 276 | } |
| 277 | |
| 278 | if (hints.ai_family != AF_INET && hints.ai_family != AF_UNSPEC) { |
| 279 | return EAI_FAMILY; |
| 280 | } |
| 281 | |
| 282 | if (hints.ai_socktype == 0) { |
| 283 | hints.ai_socktype = SOCK_STREAM; |
| 284 | } |
| 285 | |
| 286 | if (!node && !service) { |
| 287 | return EAI_NONAME; |
| 288 | } |
| 289 | |
| 290 | if (node) { |
| 291 | if (node[0] == '\0') { |
| 292 | return getaddr_info_single_addr(service, |
| 293 | INADDR_ANY, |
| 294 | &hints, |
| 295 | res); |
| 296 | } else if (hints.ai_flags & AI_NUMERICHOST) { |
| 297 | struct in_addr ip; |
| 298 | if (!inet_aton(node, &ip)) { |
| 299 | return EAI_FAIL; |
| 300 | } |
| 301 | return getaddr_info_single_addr(service, |
| 302 | ntohl(ip.s_addr), |
| 303 | &hints, |
| 304 | res); |
| 305 | } else { |
| 306 | return getaddr_info_name(node, |
| 307 | service, |
| 308 | &hints, |
| 309 | res); |
| 310 | } |
| 311 | } else if (hints.ai_flags & AI_PASSIVE) { |
| 312 | return getaddr_info_single_addr(service, |
| 313 | INADDR_ANY, |
| 314 | &hints, |
| 315 | res); |
| 316 | } |
| 317 | return getaddr_info_single_addr(service, |
| 318 | INADDR_LOOPBACK, |
| 319 | &hints, |
| 320 | res); |
| 321 | } |
| 322 | |
| 323 | |
| 324 | void freeaddrinfo(struct addrinfo *res) |
| 325 | { |
| 326 | struct addrinfo *next = NULL; |
| 327 | |
| 328 | for (;res; res = next) { |
| 329 | next = res->ai_next; |
| 330 | if (res->ai_canonname) { |
| 331 | free(res->ai_canonname); |
| 332 | } |
| 333 | if (res->ai_addr) { |
| 334 | free(res->ai_addr); |
| 335 | } |
| 336 | free(res); |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | |
| 341 | const char *gai_strerror(int errcode) |
| 342 | { |
| 343 | #ifdef HAVE_HSTRERROR |
| 344 | int hcode; |
| 345 | |
| 346 | switch (errcode) |
| 347 | { |
| 348 | case EAI_NONAME: |
| 349 | hcode = HOST_NOT_FOUND; |
| 350 | break; |
| 351 | case EAI_AGAIN: |
| 352 | hcode = TRY_AGAIN; |
| 353 | break; |
| 354 | case EAI_FAIL: |
| 355 | default: |
| 356 | hcode = NO_RECOVERY; |
| 357 | break; |
| 358 | } |
| 359 | |
| 360 | return hstrerror(hcode); |
| 361 | #else /* !HAVE_HSTRERROR */ |
| 362 | |
| 363 | switch (errcode) |
| 364 | { |
| 365 | case EAI_NONAME: |
| 366 | return "Unknown host"; |
| 367 | case EAI_AGAIN: |
| 368 | return "Host name lookup failure"; |
| 369 | #ifdef EAI_BADFLAGS |
| 370 | case EAI_BADFLAGS: |
| 371 | return "Invalid argument"; |
| 372 | #endif |
| 373 | #ifdef EAI_FAMILY |
| 374 | case EAI_FAMILY: |
| 375 | return "Address family not supported"; |
| 376 | #endif |
| 377 | #ifdef EAI_MEMORY |
| 378 | case EAI_MEMORY: |
| 379 | return "Not enough memory"; |
| 380 | #endif |
| 381 | #ifdef EAI_NODATA |
| 382 | case EAI_NODATA: |
| 383 | return "No host data of that type was found"; |
| 384 | #endif |
| 385 | #ifdef EAI_SERVICE |
| 386 | case EAI_SERVICE: |
| 387 | return "Class type not found"; |
| 388 | #endif |
| 389 | #ifdef EAI_SOCKTYPE |
| 390 | case EAI_SOCKTYPE: |
| 391 | return "Socket type not supported"; |
| 392 | #endif |
| 393 | default: |
| 394 | return "Unknown server error"; |
| 395 | } |
| 396 | #endif /* HAVE_HSTRERROR */ |
| 397 | } |
| 398 | |
| 399 | static int gethostnameinfo(const struct sockaddr *sa, |
| 400 | char *node, |
| 401 | size_t nodelen, |
| 402 | int flags) |
| 403 | { |
| 404 | int ret = -1; |
| 405 | char *p = NULL; |
| 406 | |
| 407 | if (!(flags & NI_NUMERICHOST)) { |
| 408 | struct hostent *hp = gethostbyaddr( |
| 409 | (void *)&((struct sockaddr_in *)sa)->sin_addr, |
| 410 | sizeof (struct in_addr), |
| 411 | sa->sa_family); |
| 412 | ret = check_hostent_err(hp); |
| 413 | if (ret == 0) { |
| 414 | /* Name looked up successfully. */ |
| 415 | ret = snprintf(node, nodelen, "%s", hp->h_name); |
| 416 | if (ret < 0 || (size_t)ret >= nodelen) { |
| 417 | return EAI_MEMORY; |
| 418 | } |
| 419 | if (flags & NI_NOFQDN) { |
| 420 | p = strchr(node,'.'); |
| 421 | if (p) { |
| 422 | *p = '\0'; |
| 423 | } |
| 424 | } |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | if (flags & NI_NAMEREQD) { |
| 429 | /* If we require a name and didn't get one, |
| 430 | * automatically fail. */ |
| 431 | return ret; |
| 432 | } |
| 433 | /* Otherwise just fall into the numeric host code... */ |
| 434 | } |
| 435 | p = inet_ntoa(((struct sockaddr_in *)sa)->sin_addr); |
| 436 | ret = snprintf(node, nodelen, "%s", p); |
| 437 | if (ret < 0 || (size_t)ret >= nodelen) { |
| 438 | return EAI_MEMORY; |
| 439 | } |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | static int getservicenameinfo(const struct sockaddr *sa, |
| 444 | char *service, |
| 445 | size_t servicelen, |
| 446 | int flags) |
| 447 | { |
| 448 | int ret = -1; |
| 449 | int port = ntohs(((struct sockaddr_in *)sa)->sin_port); |
| 450 | |
| 451 | if (!(flags & NI_NUMERICSERV)) { |
| 452 | struct servent *se = getservbyport( |
| 453 | port, |
| 454 | (flags & NI_DGRAM) ? "udp" : "tcp"); |
| 455 | if (se && se->s_name) { |
| 456 | /* Service name looked up successfully. */ |
| 457 | ret = snprintf(service, servicelen, "%s", se->s_name); |
| 458 | if (ret < 0 || (size_t)ret >= servicelen) { |
| 459 | return EAI_MEMORY; |
| 460 | } |
| 461 | return 0; |
| 462 | } |
| 463 | /* Otherwise just fall into the numeric service code... */ |
| 464 | } |
| 465 | ret = snprintf(service, servicelen, "%d", port); |
| 466 | if (ret < 0 || (size_t)ret >= servicelen) { |
| 467 | return EAI_MEMORY; |
| 468 | } |
| 469 | return 0; |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | * Convert an ipv4 address to a hostname. |
| 474 | * |
| 475 | * Bugs: - No IPv6 support. |
| 476 | */ |
| 477 | int getnameinfo(const struct sockaddr *sa, socklen_t salen, |
| 478 | char *node, size_t nodelen, |
| 479 | char *service, size_t servicelen, int flags) |
| 480 | { |
| 481 | |
| 482 | /* Invalid arguments. */ |
| 483 | if (sa == NULL || (node == NULL && service == NULL)) { |
| 484 | return EAI_FAIL; |
| 485 | } |
| 486 | |
| 487 | if (sa->sa_family != AF_INET) { |
| 488 | return EAI_FAIL; |
| 489 | } |
| 490 | |
| 491 | if (salen < (socklen_t)sizeof (struct sockaddr_in)) { |
| 492 | return EAI_FAIL; |
| 493 | } |
| 494 | |
| 495 | /* We don't support those. */ |
| 496 | if ((node && !(flags & NI_NUMERICHOST)) |
| 497 | || (service && !(flags & NI_NUMERICSERV))) |
| 498 | return EAI_FAIL; |
| 499 | |
| 500 | if (node) { |
| 501 | return gethostnameinfo(sa, node, nodelen, flags); |
| 502 | } |
| 503 | |
| 504 | if (service) { |
| 505 | return getservicenameinfo(sa, service, servicelen, flags); |
| 506 | } |
| 507 | return 0; |
| 508 | } |