xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1997-2016 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library 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 GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <errno.h> |
| 20 | #include <fcntl.h> |
| 21 | #include <string.h> |
| 22 | #include <libintl.h> |
| 23 | #include <rpc/rpc.h> |
| 24 | #include <rpc/auth.h> |
| 25 | #include <rpcsvc/nis.h> |
| 26 | #include <sys/socket.h> |
| 27 | #include <sys/stat.h> |
| 28 | #include <unistd.h> |
| 29 | #include <netinet/in.h> |
| 30 | #include <arpa/inet.h> |
| 31 | #include <libc-lock.h> |
| 32 | |
| 33 | #include "nis_xdr.h" |
| 34 | #include "nis_intern.h" |
| 35 | #include <libnsl.h> |
| 36 | |
| 37 | static const struct timeval RPCTIMEOUT = {10, 0}; |
| 38 | static const struct timeval UDPTIMEOUT = {5, 0}; |
| 39 | |
| 40 | extern u_short __pmap_getnisport (struct sockaddr_in *address, u_long program, |
| 41 | u_long version, u_int protocol); |
| 42 | |
| 43 | unsigned long int |
| 44 | inetstr2int (const char *str) |
| 45 | { |
| 46 | size_t j = 0; |
| 47 | for (size_t i = 0; str[i] != '\0'; ++i) |
| 48 | if (str[i] == '.' && __builtin_expect (++j == 4, 0)) |
| 49 | { |
| 50 | char buffer[i + 1]; |
| 51 | buffer[i] = '\0'; |
| 52 | return inet_addr (memcpy (buffer, str, i)); |
| 53 | } |
| 54 | |
| 55 | return inet_addr (str); |
| 56 | } |
| 57 | |
| 58 | void |
| 59 | __nisbind_destroy (dir_binding *bind) |
| 60 | { |
| 61 | if (bind->clnt != NULL) |
| 62 | { |
| 63 | if (bind->use_auth) |
| 64 | auth_destroy (bind->clnt->cl_auth); |
| 65 | clnt_destroy (bind->clnt); |
| 66 | } |
| 67 | } |
| 68 | libnsl_hidden_def (__nisbind_destroy) |
| 69 | |
| 70 | nis_error |
| 71 | __nisbind_next (dir_binding *bind) |
| 72 | { |
| 73 | if (bind->clnt != NULL) |
| 74 | { |
| 75 | if (bind->use_auth) |
| 76 | auth_destroy (bind->clnt->cl_auth); |
| 77 | clnt_destroy (bind->clnt); |
| 78 | bind->clnt = NULL; |
| 79 | } |
| 80 | |
| 81 | if (bind->trys >= bind->server_len) |
| 82 | return NIS_FAIL; |
| 83 | |
| 84 | for (u_int j = bind->current_ep + 1; |
| 85 | j < bind->server_val[bind->server_used].ep.ep_len; ++j) |
| 86 | if (strcmp (bind->server_val[bind->server_used].ep.ep_val[j].family, |
| 87 | "inet") == 0) |
| 88 | if (bind->server_val[bind->server_used].ep.ep_val[j].proto[0] == '-') |
| 89 | { |
| 90 | bind->current_ep = j; |
| 91 | return NIS_SUCCESS; |
| 92 | } |
| 93 | |
| 94 | ++bind->trys; |
| 95 | ++bind->server_used; |
| 96 | if (bind->server_used >= bind->server_len) |
| 97 | bind->server_used = 0; |
| 98 | |
| 99 | for (u_int j = 0; j < bind->server_val[bind->server_used].ep.ep_len; ++j) |
| 100 | if (strcmp (bind->server_val[bind->server_used].ep.ep_val[j].family, |
| 101 | "inet") == 0) |
| 102 | if (bind->server_val[bind->server_used].ep.ep_val[j].proto[0] == '-') |
| 103 | { |
| 104 | bind->current_ep = j; |
| 105 | return NIS_SUCCESS; |
| 106 | } |
| 107 | |
| 108 | return NIS_FAIL; |
| 109 | } |
| 110 | libnsl_hidden_def (__nisbind_next) |
| 111 | |
| 112 | static struct ckey_cache_entry |
| 113 | { |
| 114 | struct in_addr inaddr; |
| 115 | in_port_t port; |
| 116 | unsigned int protocol; |
| 117 | des_block ckey; |
| 118 | } *ckey_cache; |
| 119 | static size_t ckey_cache_size; |
| 120 | static size_t ckey_cache_allocated; |
| 121 | static pid_t ckey_cache_pid; |
| 122 | static uid_t ckey_cache_euid; |
| 123 | __libc_lock_define_initialized (static, ckey_cache_lock) |
| 124 | |
| 125 | static bool_t |
| 126 | get_ckey (des_block *ckey, struct sockaddr_in *addr, unsigned int protocol) |
| 127 | { |
| 128 | size_t i; |
| 129 | pid_t pid = getpid (); |
| 130 | uid_t euid = geteuid (); |
| 131 | bool_t ret = FALSE; |
| 132 | |
| 133 | __libc_lock_lock (ckey_cache_lock); |
| 134 | |
| 135 | if (ckey_cache_pid != pid || ckey_cache_euid != euid) |
| 136 | { |
| 137 | ckey_cache_size = 0; |
| 138 | ckey_cache_pid = pid; |
| 139 | ckey_cache_euid = euid; |
| 140 | } |
| 141 | |
| 142 | for (i = 0; i < ckey_cache_size; ++i) |
| 143 | if (ckey_cache[i].port == addr->sin_port |
| 144 | && ckey_cache[i].protocol == protocol |
| 145 | && memcmp (&ckey_cache[i].inaddr, &addr->sin_addr, |
| 146 | sizeof (addr->sin_addr)) == 0) |
| 147 | { |
| 148 | *ckey = ckey_cache[i].ckey; |
| 149 | ret = TRUE; |
| 150 | break; |
| 151 | } |
| 152 | |
| 153 | if (!ret && key_gendes (ckey) >= 0) |
| 154 | { |
| 155 | ret = TRUE; |
| 156 | /* Don't grow the cache indefinitely. */ |
| 157 | if (ckey_cache_size == 256) |
| 158 | ckey_cache_size = 0; |
| 159 | if (ckey_cache_size == ckey_cache_allocated) |
| 160 | { |
| 161 | size_t size = ckey_cache_allocated ? ckey_cache_allocated * 2 : 16; |
| 162 | struct ckey_cache_entry *new_cache |
| 163 | = realloc (ckey_cache, size * sizeof (*ckey_cache)); |
| 164 | if (new_cache != NULL) |
| 165 | { |
| 166 | ckey_cache = new_cache; |
| 167 | ckey_cache_allocated = size; |
| 168 | } |
| 169 | } |
| 170 | ckey_cache[ckey_cache_size].inaddr = addr->sin_addr; |
| 171 | ckey_cache[ckey_cache_size].port = addr->sin_port; |
| 172 | ckey_cache[ckey_cache_size].protocol = protocol; |
| 173 | ckey_cache[ckey_cache_size++].ckey = *ckey; |
| 174 | } |
| 175 | |
| 176 | __libc_lock_unlock (ckey_cache_lock); |
| 177 | return ret; |
| 178 | } |
| 179 | |
| 180 | nis_error |
| 181 | __nisbind_connect (dir_binding *dbp) |
| 182 | { |
| 183 | nis_server *serv; |
| 184 | u_short port; |
| 185 | |
| 186 | if (dbp == NULL) |
| 187 | return NIS_FAIL; |
| 188 | |
| 189 | serv = &dbp->server_val[dbp->server_used]; |
| 190 | |
| 191 | memset (&dbp->addr, '\0', sizeof (dbp->addr)); |
| 192 | dbp->addr.sin_family = AF_INET; |
| 193 | |
| 194 | dbp->addr.sin_addr.s_addr = |
| 195 | inetstr2int (serv->ep.ep_val[dbp->current_ep].uaddr); |
| 196 | |
| 197 | if (dbp->addr.sin_addr.s_addr == INADDR_NONE) |
| 198 | return NIS_FAIL; |
| 199 | |
| 200 | /* Check, if the host is online and rpc.nisd is running. Much faster |
| 201 | then the clnt*_create functions: */ |
| 202 | port = __pmap_getnisport (&dbp->addr, NIS_PROG, NIS_VERSION, |
| 203 | dbp->use_udp ? IPPROTO_UDP : IPPROTO_TCP); |
| 204 | if (port == 0) |
| 205 | return NIS_RPCERROR; |
| 206 | |
| 207 | dbp->addr.sin_port = htons (port); |
| 208 | dbp->socket = RPC_ANYSOCK; |
| 209 | if (dbp->use_udp) |
| 210 | dbp->clnt = clntudp_create (&dbp->addr, NIS_PROG, NIS_VERSION, |
| 211 | UDPTIMEOUT, &dbp->socket); |
| 212 | else |
| 213 | dbp->clnt = clnttcp_create (&dbp->addr, NIS_PROG, NIS_VERSION, |
| 214 | &dbp->socket, 0, 0); |
| 215 | |
| 216 | if (dbp->clnt == NULL) |
| 217 | return NIS_RPCERROR; |
| 218 | |
| 219 | clnt_control (dbp->clnt, CLSET_TIMEOUT, (caddr_t) &RPCTIMEOUT); |
| 220 | /* If the program exists, close the socket */ |
| 221 | if (fcntl (dbp->socket, F_SETFD, 1) == -1) |
| 222 | perror ("fcntl: F_SETFD"); |
| 223 | |
| 224 | if (dbp->use_auth) |
| 225 | { |
| 226 | if (serv->key_type == NIS_PK_DH) |
| 227 | { |
| 228 | char netname[MAXNETNAMELEN + 1]; |
| 229 | char *p; |
| 230 | des_block ckey; |
| 231 | |
| 232 | p = stpcpy (netname, "unix@"); |
| 233 | strncpy (p, serv->name, MAXNETNAMELEN - 5); |
| 234 | netname[MAXNETNAMELEN] = '\0'; |
| 235 | dbp->clnt->cl_auth = NULL; |
| 236 | if (get_ckey (&ckey, &dbp->addr, |
| 237 | dbp->use_udp ? IPPROTO_UDP : IPPROTO_TCP)) |
| 238 | dbp->clnt->cl_auth = |
| 239 | authdes_pk_create (netname, &serv->pkey, 300, NULL, &ckey); |
| 240 | if (!dbp->clnt->cl_auth) |
| 241 | dbp->clnt->cl_auth = authunix_create_default (); |
| 242 | } |
| 243 | else |
| 244 | dbp->clnt->cl_auth = authunix_create_default (); |
| 245 | } |
| 246 | |
| 247 | return NIS_SUCCESS; |
| 248 | } |
| 249 | libnsl_hidden_def (__nisbind_connect) |
| 250 | |
| 251 | nis_error |
| 252 | __nisbind_create (dir_binding *dbp, const nis_server *serv_val, |
| 253 | unsigned int serv_len, unsigned int server_used, |
| 254 | unsigned int current_ep, unsigned int flags) |
| 255 | { |
| 256 | dbp->clnt = NULL; |
| 257 | |
| 258 | dbp->server_len = serv_len; |
| 259 | dbp->server_val = (nis_server *)serv_val; |
| 260 | |
| 261 | if (flags & USE_DGRAM) |
| 262 | dbp->use_udp = TRUE; |
| 263 | else |
| 264 | dbp->use_udp = FALSE; |
| 265 | |
| 266 | if (flags & NO_AUTHINFO) |
| 267 | dbp->use_auth = FALSE; |
| 268 | else |
| 269 | dbp->use_auth = TRUE; |
| 270 | |
| 271 | if (flags & MASTER_ONLY) |
| 272 | dbp->master_only = TRUE; |
| 273 | else |
| 274 | dbp->master_only = FALSE; |
| 275 | |
| 276 | /* We try the first server */ |
| 277 | dbp->trys = 1; |
| 278 | |
| 279 | dbp->class = -1; |
| 280 | if (server_used == ~0) |
| 281 | { |
| 282 | if (__nis_findfastest (dbp) < 1) |
| 283 | return NIS_NAMEUNREACHABLE; |
| 284 | } |
| 285 | else |
| 286 | { |
| 287 | dbp->server_used = server_used; |
| 288 | dbp->current_ep = current_ep; |
| 289 | } |
| 290 | |
| 291 | return NIS_SUCCESS; |
| 292 | } |
| 293 | libnsl_hidden_def (__nisbind_create) |
| 294 | |
| 295 | /* __nisbind_connect (dbp) must be run before calling this function ! |
| 296 | So we could use the same binding twice */ |
| 297 | nis_error |
| 298 | __do_niscall3 (dir_binding *dbp, u_long prog, xdrproc_t xargs, caddr_t req, |
| 299 | xdrproc_t xres, caddr_t resp, unsigned int flags, nis_cb *cb) |
| 300 | { |
| 301 | enum clnt_stat result; |
| 302 | nis_error retcode; |
| 303 | |
| 304 | if (dbp == NULL) |
| 305 | return NIS_NAMEUNREACHABLE; |
| 306 | |
| 307 | do |
| 308 | { |
| 309 | again: |
| 310 | result = clnt_call (dbp->clnt, prog, xargs, req, xres, resp, RPCTIMEOUT); |
| 311 | |
| 312 | if (result != RPC_SUCCESS) |
| 313 | retcode = NIS_RPCERROR; |
| 314 | else |
| 315 | { |
| 316 | switch (prog) |
| 317 | { |
| 318 | case NIS_IBLIST: |
| 319 | if ((((nis_result *)resp)->status == NIS_CBRESULTS) && |
| 320 | (cb != NULL)) |
| 321 | { |
| 322 | __nis_do_callback (dbp, &((nis_result *) resp)->cookie, cb); |
| 323 | break; |
| 324 | } |
| 325 | /* Yes, the missing break is correct. If we doesn't have to |
| 326 | start a callback, look if we have to search another server */ |
| 327 | case NIS_LOOKUP: |
| 328 | case NIS_ADD: |
| 329 | case NIS_MODIFY: |
| 330 | case NIS_REMOVE: |
| 331 | case NIS_IBADD: |
| 332 | case NIS_IBMODIFY: |
| 333 | case NIS_IBREMOVE: |
| 334 | case NIS_IBFIRST: |
| 335 | case NIS_IBNEXT: |
| 336 | if (((nis_result *)resp)->status == NIS_SYSTEMERROR |
| 337 | || ((nis_result *)resp)->status == NIS_NOSUCHNAME |
| 338 | || ((nis_result *)resp)->status == NIS_NOT_ME) |
| 339 | { |
| 340 | next_server: |
| 341 | if (__nisbind_next (dbp) == NIS_SUCCESS) |
| 342 | { |
| 343 | while (__nisbind_connect (dbp) != NIS_SUCCESS) |
| 344 | { |
| 345 | if (__nisbind_next (dbp) != NIS_SUCCESS) |
| 346 | return NIS_SUCCESS; |
| 347 | } |
| 348 | } |
| 349 | else |
| 350 | break; /* No more servers to search in */ |
| 351 | goto again; |
| 352 | } |
| 353 | break; |
| 354 | case NIS_FINDDIRECTORY: |
| 355 | if (((fd_result *)resp)->status == NIS_SYSTEMERROR |
| 356 | || ((fd_result *)resp)->status == NIS_NOSUCHNAME |
| 357 | || ((fd_result *)resp)->status == NIS_NOT_ME) |
| 358 | goto next_server; |
| 359 | break; |
| 360 | case NIS_DUMPLOG: /* log_result */ |
| 361 | case NIS_DUMP: |
| 362 | if (((log_result *)resp)->lr_status == NIS_SYSTEMERROR |
| 363 | || ((log_result *)resp)->lr_status == NIS_NOSUCHNAME |
| 364 | || ((log_result *)resp)->lr_status == NIS_NOT_ME) |
| 365 | goto next_server; |
| 366 | break; |
| 367 | default: |
| 368 | break; |
| 369 | } |
| 370 | retcode = NIS_SUCCESS; |
| 371 | } |
| 372 | } |
| 373 | while ((flags & HARD_LOOKUP) && retcode == NIS_RPCERROR); |
| 374 | |
| 375 | return retcode; |
| 376 | } |
| 377 | libnsl_hidden_def (__do_niscall3) |
| 378 | |
| 379 | |
| 380 | nis_error |
| 381 | __do_niscall2 (const nis_server *server, u_int server_len, u_long prog, |
| 382 | xdrproc_t xargs, caddr_t req, xdrproc_t xres, caddr_t resp, |
| 383 | unsigned int flags, nis_cb *cb) |
| 384 | { |
| 385 | dir_binding dbp; |
| 386 | nis_error status; |
| 387 | |
| 388 | if (flags & MASTER_ONLY) |
| 389 | server_len = 1; |
| 390 | |
| 391 | status = __nisbind_create (&dbp, server, server_len, ~0, ~0, flags); |
| 392 | if (status != NIS_SUCCESS) |
| 393 | return status; |
| 394 | |
| 395 | while (__nisbind_connect (&dbp) != NIS_SUCCESS) |
| 396 | if (__nisbind_next (&dbp) != NIS_SUCCESS) |
| 397 | return NIS_NAMEUNREACHABLE; |
| 398 | |
| 399 | status = __do_niscall3 (&dbp, prog, xargs, req, xres, resp, flags, cb); |
| 400 | |
| 401 | __nisbind_destroy (&dbp); |
| 402 | |
| 403 | return status; |
| 404 | |
| 405 | } |
| 406 | |
| 407 | static directory_obj * |
| 408 | rec_dirsearch (const_nis_name name, directory_obj *dir, nis_error *status) |
| 409 | { |
| 410 | fd_result *fd_res; |
| 411 | XDR xdrs; |
| 412 | |
| 413 | switch (nis_dir_cmp (name, dir->do_name)) |
| 414 | { |
| 415 | case SAME_NAME: |
| 416 | *status = NIS_SUCCESS; |
| 417 | return dir; |
| 418 | case NOT_SEQUENTIAL: |
| 419 | /* NOT_SEQUENTIAL means, go one up and try it there ! */ |
| 420 | case HIGHER_NAME: |
| 421 | { /* We need data from a parent domain */ |
| 422 | directory_obj *obj; |
| 423 | const char *ndomain = __nis_domain_of (dir->do_name); |
| 424 | |
| 425 | /* The root server of our domain is a replica of the parent |
| 426 | domain ! (Now I understand why a root server must be a |
| 427 | replica of the parent domain) */ |
| 428 | fd_res = __nis_finddirectory (dir, ndomain); |
| 429 | if (fd_res == NULL) |
| 430 | { |
| 431 | nis_free_directory (dir); |
| 432 | *status = NIS_NOMEMORY; |
| 433 | return NULL; |
| 434 | } |
| 435 | *status = fd_res->status; |
| 436 | if (fd_res->status != NIS_SUCCESS) |
| 437 | { |
| 438 | /* Try the current directory obj, maybe it works */ |
| 439 | __free_fdresult (fd_res); |
| 440 | return dir; |
| 441 | } |
| 442 | nis_free_directory (dir); |
| 443 | obj = calloc (1, sizeof (directory_obj)); |
| 444 | if (obj == NULL) |
| 445 | { |
| 446 | __free_fdresult (fd_res); |
| 447 | *status = NIS_NOMEMORY; |
| 448 | return NULL; |
| 449 | } |
| 450 | xdrmem_create (&xdrs, fd_res->dir_data.dir_data_val, |
| 451 | fd_res->dir_data.dir_data_len, XDR_DECODE); |
| 452 | _xdr_directory_obj (&xdrs, obj); |
| 453 | xdr_destroy (&xdrs); |
| 454 | __free_fdresult (fd_res); |
| 455 | |
| 456 | /* We have found a NIS+ server serving ndomain, now |
| 457 | let us search for "name" */ |
| 458 | return rec_dirsearch (name, obj, status); |
| 459 | } |
| 460 | break; |
| 461 | case LOWER_NAME: |
| 462 | { |
| 463 | directory_obj *obj; |
| 464 | size_t namelen = strlen (name); |
| 465 | char leaf[namelen + 3]; |
| 466 | char domain[namelen + 3]; |
| 467 | const char *ndomain; |
| 468 | char *cp; |
| 469 | |
| 470 | strcpy (domain, name); |
| 471 | |
| 472 | do |
| 473 | { |
| 474 | if (domain[0] == '\0') |
| 475 | { |
| 476 | nis_free_directory (dir); |
| 477 | return NULL; |
| 478 | } |
| 479 | nis_leaf_of_r (domain, leaf, sizeof (leaf)); |
| 480 | ndomain = __nis_domain_of (domain); |
| 481 | memmove (domain, ndomain, strlen (ndomain) + 1); |
| 482 | } |
| 483 | while (nis_dir_cmp (domain, dir->do_name) != SAME_NAME); |
| 484 | |
| 485 | cp = rawmemchr (leaf, '\0'); |
| 486 | *cp++ = '.'; |
| 487 | strcpy (cp, domain); |
| 488 | |
| 489 | fd_res = __nis_finddirectory (dir, leaf); |
| 490 | if (fd_res == NULL) |
| 491 | { |
| 492 | nis_free_directory (dir); |
| 493 | *status = NIS_NOMEMORY; |
| 494 | return NULL; |
| 495 | } |
| 496 | *status = fd_res->status; |
| 497 | if (fd_res->status != NIS_SUCCESS) |
| 498 | { |
| 499 | /* Try the current directory object, maybe it works */ |
| 500 | __free_fdresult (fd_res); |
| 501 | return dir; |
| 502 | } |
| 503 | nis_free_directory (dir); |
| 504 | obj = calloc (1, sizeof(directory_obj)); |
| 505 | if (obj == NULL) |
| 506 | { |
| 507 | __free_fdresult (fd_res); |
| 508 | *status = NIS_NOMEMORY; |
| 509 | return NULL; |
| 510 | } |
| 511 | xdrmem_create (&xdrs, fd_res->dir_data.dir_data_val, |
| 512 | fd_res->dir_data.dir_data_len, XDR_DECODE); |
| 513 | _xdr_directory_obj (&xdrs, obj); |
| 514 | xdr_destroy (&xdrs); |
| 515 | __free_fdresult (fd_res); |
| 516 | /* We have found a NIS+ server serving ndomain, now |
| 517 | let us search for "name" */ |
| 518 | return rec_dirsearch (name, obj, status); |
| 519 | } |
| 520 | break; |
| 521 | case BAD_NAME: |
| 522 | nis_free_directory (dir); |
| 523 | *status = NIS_BADNAME; |
| 524 | return NULL; |
| 525 | } |
| 526 | nis_free_directory (dir); |
| 527 | *status = NIS_FAIL; |
| 528 | return NULL; |
| 529 | } |
| 530 | |
| 531 | /* We try to query the current server for the searched object, |
| 532 | maybe he know about it ? */ |
| 533 | static directory_obj * |
| 534 | first_shoot (const_nis_name name, directory_obj *dir) |
| 535 | { |
| 536 | directory_obj *obj = NULL; |
| 537 | fd_result *fd_res; |
| 538 | XDR xdrs; |
| 539 | |
| 540 | if (nis_dir_cmp (name, dir->do_name) == SAME_NAME) |
| 541 | return dir; |
| 542 | |
| 543 | fd_res = __nis_finddirectory (dir, name); |
| 544 | if (fd_res == NULL) |
| 545 | return NULL; |
| 546 | if (fd_res->status == NIS_SUCCESS |
| 547 | && (obj = calloc (1, sizeof (directory_obj))) != NULL) |
| 548 | { |
| 549 | xdrmem_create (&xdrs, fd_res->dir_data.dir_data_val, |
| 550 | fd_res->dir_data.dir_data_len, XDR_DECODE); |
| 551 | _xdr_directory_obj (&xdrs, obj); |
| 552 | xdr_destroy (&xdrs); |
| 553 | |
| 554 | if (strcmp (dir->do_name, obj->do_name) != 0) |
| 555 | { |
| 556 | nis_free_directory (obj); |
| 557 | obj = NULL; |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | __free_fdresult (fd_res); |
| 562 | |
| 563 | if (obj != NULL) |
| 564 | nis_free_directory (dir); |
| 565 | |
| 566 | return obj; |
| 567 | } |
| 568 | |
| 569 | static struct nis_server_cache |
| 570 | { |
| 571 | int search_parent; |
| 572 | int uses; |
| 573 | unsigned int size; |
| 574 | unsigned int server_used; |
| 575 | unsigned int current_ep; |
| 576 | time_t expires; |
| 577 | char name[]; |
| 578 | } *nis_server_cache[16]; |
| 579 | static time_t nis_cold_start_mtime; |
| 580 | __libc_lock_define_initialized (static, nis_server_cache_lock) |
| 581 | |
| 582 | static directory_obj * |
| 583 | nis_server_cache_search (const_nis_name name, int search_parent, |
| 584 | unsigned int *server_used, unsigned int *current_ep, |
| 585 | struct timeval *now) |
| 586 | { |
| 587 | directory_obj *ret = NULL; |
| 588 | int i; |
| 589 | char *addr; |
| 590 | XDR xdrs; |
| 591 | struct stat64 st; |
| 592 | |
| 593 | int saved_errno = errno; |
| 594 | if (stat64 ("/var/nis/NIS_COLD_START", &st) < 0) |
| 595 | st.st_mtime = nis_cold_start_mtime + 1; |
| 596 | __set_errno (saved_errno); |
| 597 | |
| 598 | __libc_lock_lock (nis_server_cache_lock); |
| 599 | |
| 600 | for (i = 0; i < 16; ++i) |
| 601 | if (nis_server_cache[i] == NULL) |
| 602 | continue; |
| 603 | else if (st.st_mtime != nis_cold_start_mtime |
| 604 | || now->tv_sec > nis_server_cache[i]->expires) |
| 605 | { |
| 606 | free (nis_server_cache[i]); |
| 607 | nis_server_cache[i] = NULL; |
| 608 | } |
| 609 | else if (nis_server_cache[i]->search_parent == search_parent |
| 610 | && strcmp (nis_server_cache[i]->name, name) == 0) |
| 611 | { |
| 612 | ret = calloc (1, sizeof (directory_obj)); |
| 613 | if (ret == NULL) |
| 614 | break; |
| 615 | |
| 616 | addr = rawmemchr (nis_server_cache[i]->name, '\0') + 8; |
| 617 | addr = (char *) ((uintptr_t) addr & ~(uintptr_t) 7); |
| 618 | xdrmem_create (&xdrs, addr, nis_server_cache[i]->size, XDR_DECODE); |
| 619 | if (!_xdr_directory_obj (&xdrs, ret)) |
| 620 | { |
| 621 | xdr_destroy (&xdrs); |
| 622 | free (ret); |
| 623 | ret = NULL; |
| 624 | free (nis_server_cache[i]); |
| 625 | nis_server_cache[i] = NULL; |
| 626 | break; |
| 627 | } |
| 628 | xdr_destroy (&xdrs); |
| 629 | *server_used = nis_server_cache[i]->server_used; |
| 630 | *current_ep = nis_server_cache[i]->current_ep; |
| 631 | break; |
| 632 | } |
| 633 | |
| 634 | nis_cold_start_mtime = st.st_mtime; |
| 635 | |
| 636 | __libc_lock_unlock (nis_server_cache_lock); |
| 637 | return ret; |
| 638 | } |
| 639 | |
| 640 | static void |
| 641 | nis_server_cache_add (const_nis_name name, int search_parent, |
| 642 | directory_obj *dir, unsigned int server_used, |
| 643 | unsigned int current_ep, struct timeval *now) |
| 644 | { |
| 645 | struct nis_server_cache **loc; |
| 646 | struct nis_server_cache *new; |
| 647 | struct nis_server_cache *old; |
| 648 | int i; |
| 649 | char *addr; |
| 650 | unsigned int size; |
| 651 | XDR xdrs; |
| 652 | |
| 653 | if (dir == NULL) |
| 654 | return; |
| 655 | |
| 656 | size = xdr_sizeof ((xdrproc_t) _xdr_directory_obj, (char *) dir); |
| 657 | new = calloc (1, sizeof (*new) + strlen (name) + 8 + size); |
| 658 | if (new == NULL) |
| 659 | return; |
| 660 | new->search_parent = search_parent; |
| 661 | new->uses = 1; |
| 662 | new->expires = now->tv_sec + dir->do_ttl; |
| 663 | new->size = size; |
| 664 | new->server_used = server_used; |
| 665 | new->current_ep = current_ep; |
| 666 | addr = stpcpy (new->name, name) + 8; |
| 667 | addr = (char *) ((uintptr_t) addr & ~(uintptr_t) 7); |
| 668 | |
| 669 | xdrmem_create(&xdrs, addr, size, XDR_ENCODE); |
| 670 | if (!_xdr_directory_obj (&xdrs, dir)) |
| 671 | { |
| 672 | xdr_destroy (&xdrs); |
| 673 | free (new); |
| 674 | return; |
| 675 | } |
| 676 | xdr_destroy (&xdrs); |
| 677 | |
| 678 | __libc_lock_lock (nis_server_cache_lock); |
| 679 | |
| 680 | /* Choose which entry should be evicted from the cache. */ |
| 681 | loc = &nis_server_cache[0]; |
| 682 | if (*loc != NULL) |
| 683 | for (i = 1; i < 16; ++i) |
| 684 | if (nis_server_cache[i] == NULL) |
| 685 | { |
| 686 | loc = &nis_server_cache[i]; |
| 687 | break; |
| 688 | } |
| 689 | else if ((*loc)->uses > nis_server_cache[i]->uses |
| 690 | || ((*loc)->uses == nis_server_cache[i]->uses |
| 691 | && (*loc)->expires > nis_server_cache[i]->expires)) |
| 692 | loc = &nis_server_cache[i]; |
| 693 | old = *loc; |
| 694 | *loc = new; |
| 695 | |
| 696 | __libc_lock_unlock (nis_server_cache_lock); |
| 697 | free (old); |
| 698 | } |
| 699 | |
| 700 | nis_error |
| 701 | __nisfind_server (const_nis_name name, int search_parent, |
| 702 | directory_obj **dir, dir_binding *dbp, unsigned int flags) |
| 703 | { |
| 704 | nis_error result = NIS_SUCCESS; |
| 705 | nis_error status; |
| 706 | directory_obj *obj; |
| 707 | struct timeval now; |
| 708 | unsigned int server_used = ~0; |
| 709 | unsigned int current_ep = ~0; |
| 710 | |
| 711 | if (name == NULL) |
| 712 | return NIS_BADNAME; |
| 713 | |
| 714 | if (*dir != NULL) |
| 715 | return NIS_SUCCESS; |
| 716 | |
| 717 | (void) gettimeofday (&now, NULL); |
| 718 | |
| 719 | if ((flags & NO_CACHE) == 0) |
| 720 | *dir = nis_server_cache_search (name, search_parent, &server_used, |
| 721 | ¤t_ep, &now); |
| 722 | if (*dir != NULL) |
| 723 | { |
| 724 | unsigned int server_len = (*dir)->do_servers.do_servers_len; |
| 725 | if (flags & MASTER_ONLY) |
| 726 | { |
| 727 | server_len = 1; |
| 728 | if (server_used != 0) |
| 729 | { |
| 730 | server_used = ~0; |
| 731 | current_ep = ~0; |
| 732 | } |
| 733 | } |
| 734 | result = __nisbind_create (dbp, (*dir)->do_servers.do_servers_val, |
| 735 | server_len, server_used, current_ep, flags); |
| 736 | if (result != NIS_SUCCESS) |
| 737 | { |
| 738 | nis_free_directory (*dir); |
| 739 | *dir = NULL; |
| 740 | } |
| 741 | return result; |
| 742 | } |
| 743 | |
| 744 | int saved_errno = errno; |
| 745 | *dir = readColdStartFile (); |
| 746 | __set_errno (saved_errno); |
| 747 | if (*dir == NULL) |
| 748 | /* No /var/nis/NIS_COLD_START->no NIS+ installed. */ |
| 749 | return NIS_UNAVAIL; |
| 750 | |
| 751 | /* Try at first, if servers in "dir" know our object */ |
| 752 | const char *search_name = name; |
| 753 | if (search_parent) |
| 754 | search_name = __nis_domain_of (name); |
| 755 | obj = first_shoot (search_name, *dir); |
| 756 | if (obj == NULL) |
| 757 | { |
| 758 | obj = rec_dirsearch (search_name, *dir, &status); |
| 759 | if (obj == NULL) |
| 760 | result = status; |
| 761 | } |
| 762 | |
| 763 | if (result == NIS_SUCCESS) |
| 764 | { |
| 765 | unsigned int server_len = obj->do_servers.do_servers_len; |
| 766 | if (flags & MASTER_ONLY) |
| 767 | server_len = 1; |
| 768 | result = __nisbind_create (dbp, obj->do_servers.do_servers_val, |
| 769 | server_len, ~0, ~0, flags); |
| 770 | if (result == NIS_SUCCESS) |
| 771 | { |
| 772 | if ((flags & MASTER_ONLY) == 0 |
| 773 | || obj->do_servers.do_servers_len == 1) |
| 774 | { |
| 775 | server_used = dbp->server_used; |
| 776 | current_ep = dbp->current_ep; |
| 777 | } |
| 778 | if ((flags & NO_CACHE) == 0) |
| 779 | nis_server_cache_add (name, search_parent, obj, |
| 780 | server_used, current_ep, &now); |
| 781 | } |
| 782 | else |
| 783 | { |
| 784 | nis_free_directory (obj); |
| 785 | obj = NULL; |
| 786 | } |
| 787 | } |
| 788 | |
| 789 | *dir = obj; |
| 790 | |
| 791 | return result; |
| 792 | } |
| 793 | |
| 794 | |
| 795 | nis_error |
| 796 | __prepare_niscall (const_nis_name name, directory_obj **dirp, |
| 797 | dir_binding *bptrp, unsigned int flags) |
| 798 | { |
| 799 | nis_error retcode = __nisfind_server (name, 1, dirp, bptrp, flags); |
| 800 | if (__glibc_unlikely (retcode != NIS_SUCCESS)) |
| 801 | return retcode; |
| 802 | |
| 803 | do |
| 804 | if (__nisbind_connect (bptrp) == NIS_SUCCESS) |
| 805 | return NIS_SUCCESS; |
| 806 | while (__nisbind_next (bptrp) == NIS_SUCCESS); |
| 807 | |
| 808 | __nisbind_destroy (bptrp); |
| 809 | memset (bptrp, '\0', sizeof (*bptrp)); |
| 810 | |
| 811 | retcode = NIS_NAMEUNREACHABLE; |
| 812 | nis_free_directory (*dirp); |
| 813 | *dirp = NULL; |
| 814 | |
| 815 | return retcode; |
| 816 | } |
| 817 | libnsl_hidden_def (__prepare_niscall) |
| 818 | |
| 819 | |
| 820 | nis_error |
| 821 | __do_niscall (const_nis_name name, u_long prog, xdrproc_t xargs, |
| 822 | caddr_t req, xdrproc_t xres, caddr_t resp, unsigned int flags, |
| 823 | nis_cb *cb) |
| 824 | { |
| 825 | dir_binding bptr; |
| 826 | directory_obj *dir = NULL; |
| 827 | int saved_errno = errno; |
| 828 | |
| 829 | nis_error retcode = __prepare_niscall (name, &dir, &bptr, flags); |
| 830 | if (retcode == NIS_SUCCESS) |
| 831 | { |
| 832 | retcode = __do_niscall3 (&bptr, prog, xargs, req, xres, resp, flags, cb); |
| 833 | |
| 834 | __nisbind_destroy (&bptr); |
| 835 | |
| 836 | nis_free_directory (dir); |
| 837 | } |
| 838 | |
| 839 | __set_errno (saved_errno); |
| 840 | |
| 841 | return retcode; |
| 842 | } |