lib/libc/yp/yplib.c

   1 /*
   2  * Copyright (c) 1992/3 Theo de Raadt <deraadt@fsa.ca>
   3  * Copyright (c) 1998 Bill Paul <wpaul@ctr.columbia.edu>
   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  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote
  15  *    products derived from this software without specific prior written
  16  *    permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  19  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include "namespace.h"
  35 #include "reentrant.h"
  36 #include <sys/param.h>
  37 #include <sys/types.h>
  38 #include <sys/socket.h>
  39 #include <sys/file.h>
  40 #include <sys/uio.h>
  41 #include <arpa/inet.h>
  42 #include <errno.h>
  43 #include <stdio.h>
  44 #include <string.h>
  45 #include <stdlib.h>
  46 #include <unistd.h>
  47 #include <rpc/rpc.h>
  48 #include <rpc/xdr.h>
  49 #include <rpcsvc/yp.h>
  50 #include "un-namespace.h"
  51 #include "libc_private.h"
  52
  53 /*
  54  * We have to define these here due to clashes between yp_prot.h and
  55  * yp.h.
  56  */
  57
  58 #define YPMATCHCACHE
  59
  60 #ifdef YPMATCHCACHE
  61 struct ypmatch_ent {
  62         char                    *ypc_map;
  63         keydat                  ypc_key;
  64         valdat                  ypc_val;
  65         time_t                  ypc_expire_t;
  66         struct ypmatch_ent      *ypc_next;
  67 };
  68 #define YPLIB_MAXCACHE  5       /* At most 5 entries */
  69 #define YPLIB_EXPIRE    5       /* Expire after 5 seconds */
  70 #endif
  71
  72 struct dom_binding {
  73         struct dom_binding *dom_pnext;
  74         char dom_domain[YPMAXDOMAIN + 1];
  75         struct sockaddr_in dom_server_addr;
  76         u_short dom_server_port;
  77         int dom_socket;
  78         CLIENT *dom_client;
  79         u_short dom_local_port; /* now I finally know what this is for. */
  80         long dom_vers;
  81 #ifdef YPMATCHCACHE
  82         struct ypmatch_ent *cache;
  83         int ypmatch_cachecnt;
  84 #endif
  85 };
  86
  87 #include <rpcsvc/ypclnt.h>
  88
  89 #ifndef BINDINGDIR
  90 #define BINDINGDIR "/var/yp/binding"
  91 #endif
  92 #define MAX_RETRIES 20
  93
  94 extern bool_t xdr_domainname(), xdr_ypbind_resp();
  95 extern bool_t xdr_ypreq_key(), xdr_ypresp_val();
  96 extern bool_t xdr_ypreq_nokey(), xdr_ypresp_key_val();
  97 extern bool_t xdr_ypresp_all(), xdr_ypresp_all_seq();
  98 extern bool_t xdr_ypresp_master();
  99
 100 int (*ypresp_allfn)();
 101 void *ypresp_data;
 102
 103 static void _yp_unbind(struct dom_binding *);
 104 struct dom_binding *_ypbindlist;
 105 static char _yp_domain[MAXHOSTNAMELEN];
 106 int _yplib_timeout = 20;
 107
 108 static mutex_t _ypmutex = MUTEX_INITIALIZER;
 109 #define YPLOCK()        mutex_lock(&_ypmutex);
 110 #define YPUNLOCK()      mutex_unlock(&_ypmutex);
 111
 112 #ifdef YPMATCHCACHE
 113 static void
 114 ypmatch_cache_delete(struct dom_binding *ypdb, struct ypmatch_ent *prev,
 115     struct ypmatch_ent *cur)
 116 {
 117         if (prev == NULL)
 118                 ypdb->cache = cur->ypc_next;
 119         else
 120                 prev->ypc_next = cur->ypc_next;
 121
 122         free(cur->ypc_map);
 123         free(cur->ypc_key.keydat_val);
 124         free(cur->ypc_val.valdat_val);
 125         free(cur);
 126
 127         ypdb->ypmatch_cachecnt--;
 128
 129         return;
 130 }
 131
 132 static void
 133 ypmatch_cache_flush(struct dom_binding *ypdb)
 134 {
 135         struct ypmatch_ent      *n, *c = ypdb->cache;
 136
 137         while (c != NULL) {
 138                 n = c->ypc_next;
 139                 ypmatch_cache_delete(ypdb, NULL, c);
 140                 c = n;
 141         }
 142
 143         return;
 144 }
 145
 146 static void
 147 ypmatch_cache_expire(struct dom_binding *ypdb)
 148 {
 149         struct ypmatch_ent      *c = ypdb->cache;
 150         struct ypmatch_ent      *n, *p = NULL;
 151         time_t                  t;
 152
 153         time(&t);
 154
 155         while (c != NULL) {
 156                 if (t >= c->ypc_expire_t) {
 157                         n = c->ypc_next;
 158                         ypmatch_cache_delete(ypdb, p, c);
 159                         c = n;
 160                 } else {
 161                         p = c;
 162                         c = c->ypc_next;
 163                 }
 164         }
 165
 166         return;
 167 }
 168
 169 static void
 170 ypmatch_cache_insert(struct dom_binding *ypdb, char *map, keydat *key,
 171     valdat *val)
 172 {
 173         struct ypmatch_ent      *new;
 174
 175         /* Do an expire run to maybe open up a slot. */
 176         if (ypdb->ypmatch_cachecnt)
 177                 ypmatch_cache_expire(ypdb);
 178
 179         /*
 180          * If there are no slots free, then force an expire of
 181          * the least recently used entry.
 182          */
 183         if (ypdb->ypmatch_cachecnt >= YPLIB_MAXCACHE) {
 184                 struct ypmatch_ent      *o = NULL, *c = ypdb->cache;
 185                 time_t                  oldest = 0;
 186
 187                 oldest = ~oldest;
 188
 189                 while (c != NULL) {
 190                         if (c->ypc_expire_t < oldest) {
 191                                 oldest = c->ypc_expire_t;
 192                                 o = c;
 193                         }
 194                         c = c->ypc_next;
 195                 }
 196
 197                 if (o == NULL)
 198                         return;
 199                 o->ypc_expire_t = 0;
 200                 ypmatch_cache_expire(ypdb);
 201         }
 202
 203         new = malloc(sizeof(struct ypmatch_ent));
 204         if (new == NULL)
 205                 return;
 206
 207         new->ypc_map = strdup(map);
 208         if (new->ypc_map == NULL) {
 209                 free(new);
 210                 return;
 211         }
 212         new->ypc_key.keydat_val = malloc(key->keydat_len);
 213         if (new->ypc_key.keydat_val == NULL) {
 214                 free(new->ypc_map);
 215                 free(new);
 216                 return;
 217         }
 218         new->ypc_val.valdat_val = malloc(val->valdat_len);
 219         if (new->ypc_val.valdat_val == NULL) {
 220                 free(new->ypc_val.valdat_val);
 221                 free(new->ypc_map);
 222                 free(new);
 223                 return;
 224         }
 225
 226         new->ypc_expire_t = time(NULL) + YPLIB_EXPIRE;
 227         new->ypc_key.keydat_len = key->keydat_len;
 228         new->ypc_val.valdat_len = val->valdat_len;
 229         bcopy(key->keydat_val, new->ypc_key.keydat_val, key->keydat_len);
 230         bcopy(val->valdat_val, new->ypc_val.valdat_val, val->valdat_len);
 231
 232         new->ypc_next = ypdb->cache;
 233         ypdb->cache = new;
 234
 235         ypdb->ypmatch_cachecnt++;
 236
 237         return;
 238 }
 239
 240 static bool_t
 241 ypmatch_cache_lookup(struct dom_binding *ypdb, char *map, keydat *key,
 242     valdat *val)
 243 {
 244         struct ypmatch_ent      *c;
 245
 246         ypmatch_cache_expire(ypdb);
 247
 248         for (c = ypdb->cache; c != NULL; c = c->ypc_next) {
 249                 if (strcmp(map, c->ypc_map))
 250                         continue;
 251                 if (key->keydat_len != c->ypc_key.keydat_len)
 252                         continue;
 253                 if (bcmp(key->keydat_val, c->ypc_key.keydat_val,
 254                                 key->keydat_len))
 255                         continue;
 256         }
 257
 258         if (c == NULL)
 259                 return(FALSE);
 260
 261         val->valdat_len = c->ypc_val.valdat_len;
 262         val->valdat_val = c->ypc_val.valdat_val;
 263
 264         return(TRUE);
 265 }
 266 #endif
 267
 268 const char *
 269 ypbinderr_string(int incode)
 270 {
 271         static char err[80];
 272         switch (incode) {
 273         case 0:
 274                 return ("Success");
 275         case YPBIND_ERR_ERR:
 276                 return ("Internal ypbind error");
 277         case YPBIND_ERR_NOSERV:
 278                 return ("Domain not bound");
 279         case YPBIND_ERR_RESC:
 280                 return ("System resource allocation failure");
 281         }
 282         sprintf(err, "Unknown ypbind error: #%d\n", incode);
 283         return (err);
 284 }
 285
 286 int
 287 _yp_dobind(char *dom, struct dom_binding **ypdb)
 288 {
 289         static pid_t pid = -1;
 290         char path[MAXPATHLEN];
 291         struct dom_binding *ysd, *ysd2;
 292         struct ypbind_resp ypbr;
 293         struct timeval tv;
 294         struct sockaddr_in clnt_sin;
 295         int clnt_sock, fd;
 296         pid_t gpid;
 297         CLIENT *client;
 298         int new = 0, r;
 299         int retries = 0;
 300         struct sockaddr_in check;
 301         socklen_t checklen = sizeof(struct sockaddr_in);
 302
 303         /* Not allowed; bad doggie. Bad. */
 304         if (strchr(dom, '/') != NULL)
 305                 return(YPERR_BADARGS);
 306
 307         gpid = getpid();
 308         if (!(pid == -1 || pid == gpid)) {
 309                 ysd = _ypbindlist;
 310                 while (ysd) {
 311                         if (ysd->dom_client != NULL)
 312                                 _yp_unbind(ysd);
 313                         ysd2 = ysd->dom_pnext;
 314                         free(ysd);
 315                         ysd = ysd2;
 316                 }
 317                 _ypbindlist = NULL;
 318         }
 319         pid = gpid;
 320
 321         if (ypdb != NULL)
 322                 *ypdb = NULL;
 323
 324         if (dom == NULL || strlen(dom) == 0)
 325                 return (YPERR_BADARGS);
 326
 327         for (ysd = _ypbindlist; ysd; ysd = ysd->dom_pnext)
 328                 if (strcmp(dom, ysd->dom_domain) == 0)
 329                         break;
 330
 331
 332         if (ysd == NULL) {
 333                 ysd = (struct dom_binding *)malloc(sizeof *ysd);
 334                 bzero((char *)ysd, sizeof *ysd);
 335                 ysd->dom_socket = -1;
 336                 ysd->dom_vers = 0;
 337                 new = 1;
 338         } else {
 339         /* Check the socket -- may have been hosed by the caller. */
 340                 if (_getsockname(ysd->dom_socket, (struct sockaddr *)&check,
 341                     &checklen) == -1 || check.sin_family != AF_INET ||
 342                     check.sin_port != ysd->dom_local_port) {
 343                 /* Socket became bogus somehow... need to rebind. */
 344                         int save, sock;
 345
 346                         sock = ysd->dom_socket;
 347                         save = _dup(ysd->dom_socket);
 348                         if (ysd->dom_client != NULL)
 349                                 clnt_destroy(ysd->dom_client);
 350                         ysd->dom_vers = 0;
 351                         ysd->dom_client = NULL;
 352                         sock = _dup2(save, sock);
 353                         _close(save);
 354                 }
 355         }
 356
 357 again:
 358         retries++;
 359         if (retries > MAX_RETRIES) {
 360                 if (new)
 361                         free(ysd);
 362                 return(YPERR_YPBIND);
 363         }
 364 #ifdef BINDINGDIR
 365         if (ysd->dom_vers == 0) {
 366                 /*
 367                  * We're trying to make a new binding: zorch the
 368                  * existing handle now (if any).
 369                  */
 370                 if (ysd->dom_client != NULL) {
 371                         clnt_destroy(ysd->dom_client);
 372                         ysd->dom_client = NULL;
 373                         ysd->dom_socket = -1;
 374                 }
 375                 snprintf(path, sizeof(path), "%s/%s.%d", BINDINGDIR, dom, 2);
 376                 if ((fd = _open(path, O_RDONLY | O_CLOEXEC)) == -1) {
 377                         /* no binding file, YP is dead. */
 378                         /* Try to bring it back to life. */
 379                         _close(fd);
 380                         goto skipit;
 381                 }
 382                 if (_flock(fd, LOCK_EX|LOCK_NB) == -1 && errno == EWOULDBLOCK) {
 383                         struct iovec iov[2];
 384                         struct ypbind_resp ybr;
 385                         u_short ypb_port;
 386
 387                         iov[0].iov_base = (caddr_t)&ypb_port;
 388                         iov[0].iov_len = sizeof ypb_port;
 389                         iov[1].iov_base = (caddr_t)&ybr;
 390                         iov[1].iov_len = sizeof ybr;
 391
 392                         r = _readv(fd, iov, 2);
 393                         if (r != iov[0].iov_len + iov[1].iov_len) {
 394                                 _close(fd);
 395                                 ysd->dom_vers = -1;
 396                                 goto again;
 397                         }
 398
 399                         bzero(&ysd->dom_server_addr, sizeof ysd->dom_server_addr);
 400                         ysd->dom_server_addr.sin_family = AF_INET;
 401                         ysd->dom_server_addr.sin_len = sizeof(struct sockaddr_in);
 402                         bcopy(&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr,
 403                             &ysd->dom_server_addr.sin_addr.s_addr,
 404                             sizeof(ysd->dom_server_addr.sin_addr.s_addr));
 405                         bcopy(&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port,
 406                             &ysd->dom_server_addr.sin_port,
 407                             sizeof(ysd->dom_server_addr.sin_port));
 408
 409                         ysd->dom_server_port = ysd->dom_server_addr.sin_port;
 410                         _close(fd);
 411                         goto gotit;
 412                 } else {
 413                         /* no lock on binding file, YP is dead. */
 414                         /* Try to bring it back to life. */
 415                         _close(fd);
 416                         goto skipit;
 417                 }
 418         }
 419 skipit:
 420 #endif
 421         if (ysd->dom_vers == -1 || ysd->dom_vers == 0) {
 422                 /*
 423                  * We're trying to make a new binding: zorch the
 424                  * existing handle now (if any).
 425                  */
 426                 if (ysd->dom_client != NULL) {
 427                         clnt_destroy(ysd->dom_client);
 428                         ysd->dom_client = NULL;
 429                         ysd->dom_socket = -1;
 430                 }
 431                 bzero((char *)&clnt_sin, sizeof clnt_sin);
 432                 clnt_sin.sin_family = AF_INET;
 433                 clnt_sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 434
 435                 clnt_sock = RPC_ANYSOCK;
 436                 client = clnttcp_create(&clnt_sin, YPBINDPROG, YPBINDVERS, &clnt_sock,
 437                         0, 0);
 438                 if (client == NULL) {
 439                         /*
 440                          * These conditions indicate ypbind just isn't
 441                          * alive -- we probably don't want to shoot our
 442                          * mouth off in this case; instead generate error
 443                          * messages only for really exotic problems.
 444                          */
 445                         if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED &&
 446                            (rpc_createerr.cf_stat != RPC_SYSTEMERROR &&
 447                            rpc_createerr.cf_error.re_errno == ECONNREFUSED))
 448                                 clnt_pcreateerror("clnttcp_create");
 449                         if (new)
 450                                 free(ysd);
 451                         return (YPERR_YPBIND);
 452                 }
 453
 454                 /*
 455                  * Check the port number -- should be < IPPORT_RESERVED.
 456                  * If not, it's possible someone has registered a bogus
 457                  * ypbind with the portmapper and is trying to trick us.
 458                  */
 459                 if (ntohs(clnt_sin.sin_port) >= IPPORT_RESERVED) {
 460                         if (client != NULL)
 461                                 clnt_destroy(client);
 462                         if (new)
 463                                 free(ysd);
 464                         return(YPERR_YPBIND);
 465                 }
 466                 tv.tv_sec = _yplib_timeout/2;
 467                 tv.tv_usec = 0;
 468                 r = clnt_call(client, YPBINDPROC_DOMAIN,
 469                         (xdrproc_t)xdr_domainname, &dom,
 470                         (xdrproc_t)xdr_ypbind_resp, &ypbr, tv);
 471                 if (r != RPC_SUCCESS) {
 472                         clnt_destroy(client);
 473                         ysd->dom_vers = -1;
 474                         if (r == RPC_PROGUNAVAIL || r == RPC_PROCUNAVAIL) {
 475                                 if (new)
 476                                         free(ysd);
 477                                 return(YPERR_YPBIND);
 478                         }
 479                         fprintf(stderr,
 480                         "YP: server for domain %s not responding, retrying\n", dom);
 481                         goto again;
 482                 } else {
 483                         if (ypbr.ypbind_status != YPBIND_SUCC_VAL) {
 484                                 struct timespec time_to_sleep, time_remaining;
 485
 486                                 clnt_destroy(client);
 487                                 ysd->dom_vers = -1;
 488
 489                                 time_to_sleep.tv_sec = _yplib_timeout/2;
 490                                 time_to_sleep.tv_nsec = 0;
 491                                 _nanosleep(&time_to_sleep,
 492                                     &time_remaining);
 493                                 goto again;
 494                         }
 495                 }
 496                 clnt_destroy(client);
 497
 498                 bzero((char *)&ysd->dom_server_addr, sizeof ysd->dom_server_addr);
 499                 ysd->dom_server_addr.sin_family = AF_INET;
 500                 bcopy(&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port,
 501                     &ysd->dom_server_addr.sin_port,
 502                     sizeof(ysd->dom_server_addr.sin_port));
 503                 bcopy(&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr,
 504                     &ysd->dom_server_addr.sin_addr.s_addr,
 505                     sizeof(ysd->dom_server_addr.sin_addr.s_addr));
 506
 507                 /*
 508                  * We could do a reserved port check here too, but this
 509                  * could pose compatibility problems. The local ypbind is
 510                  * supposed to decide whether or not to trust yp servers
 511                  * on insecure ports. For now, we trust its judgement.
 512                  */
 513                 ysd->dom_server_port =
 514                         *(u_short *)&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port;
 515 gotit:
 516                 ysd->dom_vers = YPVERS;
 517                 strlcpy(ysd->dom_domain, dom, sizeof(ysd->dom_domain));
 518         }
 519
 520         /* Don't rebuild the connection to the server unless we have to. */
 521         if (ysd->dom_client == NULL) {
 522                 tv.tv_sec = _yplib_timeout/2;
 523                 tv.tv_usec = 0;
 524                 ysd->dom_socket = RPC_ANYSOCK;
 525                 ysd->dom_client = clntudp_bufcreate(&ysd->dom_server_addr,
 526                         YPPROG, YPVERS, tv, &ysd->dom_socket, 1280, 2304);
 527                 if (ysd->dom_client == NULL) {
 528                         clnt_pcreateerror("clntudp_create");
 529                         ysd->dom_vers = -1;
 530                         goto again;
 531                 }
 532                 if (_fcntl(ysd->dom_socket, F_SETFD, 1) == -1)
 533                         perror("fcntl: F_SETFD");
 534                 /*
 535                  * We want a port number associated with this socket
 536                  * so that we can check its authenticity later.
 537                  */
 538                 checklen = sizeof(struct sockaddr_in);
 539                 bzero((char *)&check, checklen);
 540                 _bind(ysd->dom_socket, (struct sockaddr *)&check, checklen);
 541                 check.sin_family = AF_INET;
 542                 if (!_getsockname(ysd->dom_socket,
 543                     (struct sockaddr *)&check, &checklen)) {
 544                         ysd->dom_local_port = check.sin_port;
 545                 } else {
 546                         clnt_destroy(ysd->dom_client);
 547                         if (new)
 548                                 free(ysd);
 549                         return(YPERR_YPBIND);
 550                 }
 551         }
 552
 553         if (new) {
 554                 ysd->dom_pnext = _ypbindlist;
 555                 _ypbindlist = ysd;
 556         }
 557
 558         /*
 559          * Set low retry timeout to realistically handle UDP packet
 560          * loss for YP packet bursts.
 561          */
 562         tv.tv_sec = 1;
 563         tv.tv_usec = 0;
 564         clnt_control(ysd->dom_client, CLSET_RETRY_TIMEOUT, (char*)&tv);
 565
 566         if (ypdb != NULL)
 567                 *ypdb = ysd;
 568         return (0);
 569 }
 570
 571 static void
 572 _yp_unbind(struct dom_binding *ypb)
 573 {
 574         struct sockaddr_in check;
 575         socklen_t checklen = sizeof(struct sockaddr_in);
 576
 577         if (ypb->dom_client != NULL) {
 578                 /* Check the socket -- may have been hosed by the caller. */
 579                 if (_getsockname(ypb->dom_socket, (struct sockaddr *)&check,
 580                 &checklen) == -1 || check.sin_family != AF_INET ||
 581                 check.sin_port != ypb->dom_local_port) {
 582                         int save, sock;
 583
 584                         sock = ypb->dom_socket;
 585                         save = _dup(ypb->dom_socket);
 586                         clnt_destroy(ypb->dom_client);
 587                         sock = _dup2(save, sock);
 588                         _close(save);
 589                 } else
 590                         clnt_destroy(ypb->dom_client);
 591         }
 592
 593         ypb->dom_client = NULL;
 594         ypb->dom_socket = -1;
 595         ypb->dom_vers = -1;
 596 #ifdef YPMATCHCACHE
 597         ypmatch_cache_flush(ypb);
 598 #endif
 599 }
 600
 601 static int
 602 yp_bind_locked(char *dom)
 603 {
 604         return (_yp_dobind(dom, NULL));
 605 }
 606
 607 int
 608 yp_bind(char *dom)
 609 {
 610         int r;
 611
 612         YPLOCK();
 613         r = yp_bind_locked(dom);
 614         YPUNLOCK();
 615         return (r);
 616 }
 617
 618 static void
 619 yp_unbind_locked(char *dom)
 620 {
 621         struct dom_binding *ypb, *ypbp;
 622
 623         ypbp = NULL;
 624         for (ypb = _ypbindlist; ypb; ypb = ypb->dom_pnext) {
 625                 if (strcmp(dom, ypb->dom_domain) == 0) {
 626                         _yp_unbind(ypb);
 627                         if (ypbp)
 628                                 ypbp->dom_pnext = ypb->dom_pnext;
 629                         else
 630                                 _ypbindlist = ypb->dom_pnext;
 631                         free(ypb);
 632                         return;
 633                 }
 634                 ypbp = ypb;
 635         }
 636         return;
 637 }
 638
 639 void
 640 yp_unbind(char *dom)
 641 {
 642         YPLOCK();
 643         yp_unbind_locked(dom);
 644         YPUNLOCK();
 645 }
 646
 647 int
 648 yp_match(char *indomain, char *inmap, const char *inkey, int inkeylen,
 649     char **outval, int *outvallen)
 650 {
 651         struct dom_binding *ysd;
 652         struct ypresp_val yprv;
 653         struct timeval tv;
 654         struct ypreq_key yprk;
 655         int r;
 656         int retries = 0;
 657         *outval = NULL;
 658         *outvallen = 0;
 659
 660         /* Sanity check */
 661
 662         if (inkey == NULL || !strlen(inkey) || inkeylen <= 0 ||
 663             inmap == NULL || !strlen(inmap) ||
 664             indomain == NULL || !strlen(indomain))
 665                 return (YPERR_BADARGS);
 666
 667         YPLOCK();
 668         if (_yp_dobind(indomain, &ysd) != 0) {
 669                 YPUNLOCK();
 670                 return(YPERR_DOMAIN);
 671         }
 672
 673         yprk.domain = indomain;
 674         yprk.map = inmap;
 675         yprk.key.keydat_val = (char *)inkey;
 676         yprk.key.keydat_len = inkeylen;
 677
 678 #ifdef YPMATCHCACHE
 679         if (ypmatch_cache_lookup(ysd, yprk.map, &yprk.key, &yprv.val) == TRUE) {
 680 /*
 681         if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
 682             inkeylen, &yprv.val.valdat_val, &yprv.val.valdat_len)) {
 683 */
 684                 *outvallen = yprv.val.valdat_len;
 685                 *outval = (char *)malloc(*outvallen+1);
 686                 bcopy(yprv.val.valdat_val, *outval, *outvallen);
 687                 (*outval)[*outvallen] = '\0';
 688                 YPUNLOCK();
 689                 return (0);
 690         }
 691 #endif
 692
 693 again:
 694         if (retries > MAX_RETRIES) {
 695                 YPUNLOCK();
 696                 return (YPERR_RPC);
 697         }
 698
 699         if (_yp_dobind(indomain, &ysd) != 0) {
 700                 YPUNLOCK();
 701                 return (YPERR_DOMAIN);
 702         }
 703
 704         tv.tv_sec = _yplib_timeout;
 705         tv.tv_usec = 0;
 706
 707         bzero((char *)&yprv, sizeof yprv);
 708
 709         r = clnt_call(ysd->dom_client, YPPROC_MATCH,
 710                 (xdrproc_t)xdr_ypreq_key, &yprk,
 711                 (xdrproc_t)xdr_ypresp_val, &yprv, tv);
 712         if (r != RPC_SUCCESS) {
 713                 clnt_perror(ysd->dom_client, "yp_match: clnt_call");
 714                 _yp_unbind(ysd);
 715                 retries++;
 716                 goto again;
 717         }
 718
 719         if (!(r = ypprot_err(yprv.stat))) {
 720                 *outvallen = yprv.val.valdat_len;
 721                 *outval = (char *)malloc(*outvallen+1);
 722                 bcopy(yprv.val.valdat_val, *outval, *outvallen);
 723                 (*outval)[*outvallen] = '\0';
 724 #ifdef YPMATCHCACHE
 725                 ypmatch_cache_insert(ysd, yprk.map, &yprk.key, &yprv.val);
 726 #endif
 727         }
 728
 729         xdr_free((xdrproc_t)xdr_ypresp_val, &yprv);
 730         YPUNLOCK();
 731         return (r);
 732 }
 733
 734 static int
 735 yp_get_default_domain_locked(char **domp)
 736 {
 737         *domp = NULL;
 738         if (_yp_domain[0] == '\0')
 739                 if (getdomainname(_yp_domain, sizeof _yp_domain))
 740                         return (YPERR_NODOM);
 741         *domp = _yp_domain;
 742         return (0);
 743 }
 744
 745 int
 746 yp_get_default_domain(char **domp)
 747 {
 748         int r;
 749
 750         YPLOCK();
 751         r = yp_get_default_domain_locked(domp);
 752         YPUNLOCK();
 753         return (r);
 754 }
 755
 756 int
 757 yp_first(char *indomain, char *inmap, char **outkey, int *outkeylen,
 758     char **outval, int *outvallen)
 759 {
 760         struct ypresp_key_val yprkv;
 761         struct ypreq_nokey yprnk;
 762         struct dom_binding *ysd;
 763         struct timeval tv;
 764         int r;
 765         int retries = 0;
 766         /* Sanity check */
 767
 768         if (indomain == NULL || !strlen(indomain) ||
 769             inmap == NULL || !strlen(inmap))
 770                 return (YPERR_BADARGS);
 771
 772         *outkey = *outval = NULL;
 773         *outkeylen = *outvallen = 0;
 774
 775         YPLOCK();
 776 again:
 777         if (retries > MAX_RETRIES) {
 778                 YPUNLOCK();
 779                 return (YPERR_RPC);
 780         }
 781
 782         if (_yp_dobind(indomain, &ysd) != 0) {
 783                 YPUNLOCK();
 784                 return (YPERR_DOMAIN);
 785         }
 786
 787         tv.tv_sec = _yplib_timeout;
 788         tv.tv_usec = 0;
 789
 790         yprnk.domain = indomain;
 791         yprnk.map = inmap;
 792         bzero((char *)&yprkv, sizeof yprkv);
 793
 794         r = clnt_call(ysd->dom_client, YPPROC_FIRST,
 795                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 796                 (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
 797         if (r != RPC_SUCCESS) {
 798                 clnt_perror(ysd->dom_client, "yp_first: clnt_call");
 799                 _yp_unbind(ysd);
 800                 retries++;
 801                 goto again;
 802         }
 803         if (!(r = ypprot_err(yprkv.stat))) {
 804                 *outkeylen = yprkv.key.keydat_len;
 805                 *outkey = (char *)malloc(*outkeylen+1);
 806                 bcopy(yprkv.key.keydat_val, *outkey, *outkeylen);
 807                 (*outkey)[*outkeylen] = '\0';
 808                 *outvallen = yprkv.val.valdat_len;
 809                 *outval = (char *)malloc(*outvallen+1);
 810                 bcopy(yprkv.val.valdat_val, *outval, *outvallen);
 811                 (*outval)[*outvallen] = '\0';
 812         }
 813
 814         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 815         YPUNLOCK();
 816         return (r);
 817 }
 818
 819 int
 820 yp_next(char *indomain, char *inmap, char *inkey, int inkeylen,
 821     char **outkey, int *outkeylen, char **outval, int *outvallen)
 822 {
 823         struct ypresp_key_val yprkv;
 824         struct ypreq_key yprk;
 825         struct dom_binding *ysd;
 826         struct timeval tv;
 827         int r;
 828         int retries = 0;
 829         /* Sanity check */
 830
 831         if (inkey == NULL || !strlen(inkey) || inkeylen <= 0 ||
 832             inmap == NULL || !strlen(inmap) ||
 833             indomain == NULL || !strlen(indomain))
 834                 return (YPERR_BADARGS);
 835
 836         *outkey = *outval = NULL;
 837         *outkeylen = *outvallen = 0;
 838
 839         YPLOCK();
 840 again:
 841         if (retries > MAX_RETRIES) {
 842                 YPUNLOCK();
 843                 return (YPERR_RPC);
 844         }
 845
 846         if (_yp_dobind(indomain, &ysd) != 0) {
 847                 YPUNLOCK();
 848                 return (YPERR_DOMAIN);
 849         }
 850
 851         tv.tv_sec = _yplib_timeout;
 852         tv.tv_usec = 0;
 853
 854         yprk.domain = indomain;
 855         yprk.map = inmap;
 856         yprk.key.keydat_val = inkey;
 857         yprk.key.keydat_len = inkeylen;
 858         bzero((char *)&yprkv, sizeof yprkv);
 859
 860         r = clnt_call(ysd->dom_client, YPPROC_NEXT,
 861                 (xdrproc_t)xdr_ypreq_key, &yprk,
 862                 (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
 863         if (r != RPC_SUCCESS) {
 864                 clnt_perror(ysd->dom_client, "yp_next: clnt_call");
 865                 _yp_unbind(ysd);
 866                 retries++;
 867                 goto again;
 868         }
 869         if (!(r = ypprot_err(yprkv.stat))) {
 870                 *outkeylen = yprkv.key.keydat_len;
 871                 *outkey = (char *)malloc(*outkeylen+1);
 872                 bcopy(yprkv.key.keydat_val, *outkey, *outkeylen);
 873                 (*outkey)[*outkeylen] = '\0';
 874                 *outvallen = yprkv.val.valdat_len;
 875                 *outval = (char *)malloc(*outvallen+1);
 876                 bcopy(yprkv.val.valdat_val, *outval, *outvallen);
 877                 (*outval)[*outvallen] = '\0';
 878         }
 879
 880         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 881         YPUNLOCK();
 882         return (r);
 883 }
 884
 885 int
 886 yp_all(char *indomain, char *inmap, struct ypall_callback *incallback)
 887 {
 888         struct ypreq_nokey yprnk;
 889         struct dom_binding *ysd;
 890         struct timeval tv;
 891         struct sockaddr_in clnt_sin;
 892         CLIENT *clnt;
 893         u_long status, savstat;
 894         int clnt_sock;
 895         int retries = 0;
 896         /* Sanity check */
 897
 898         if (indomain == NULL || !strlen(indomain) ||
 899             inmap == NULL || !strlen(inmap))
 900                 return (YPERR_BADARGS);
 901
 902         YPLOCK();
 903 again:
 904         if (retries > MAX_RETRIES) {
 905                 YPUNLOCK();
 906                 return (YPERR_RPC);
 907         }
 908
 909         if (_yp_dobind(indomain, &ysd) != 0) {
 910                 YPUNLOCK();
 911                 return (YPERR_DOMAIN);
 912         }
 913
 914         tv.tv_sec = _yplib_timeout;
 915         tv.tv_usec = 0;
 916
 917         /* YPPROC_ALL manufactures its own channel to ypserv using TCP */
 918
 919         clnt_sock = RPC_ANYSOCK;
 920         clnt_sin = ysd->dom_server_addr;
 921         clnt_sin.sin_port = 0;
 922         clnt = clnttcp_create(&clnt_sin, YPPROG, YPVERS, &clnt_sock, 0, 0);
 923         if (clnt == NULL) {
 924                 YPUNLOCK();
 925                 printf("clnttcp_create failed\n");
 926                 return (YPERR_PMAP);
 927         }
 928
 929         yprnk.domain = indomain;
 930         yprnk.map = inmap;
 931         ypresp_allfn = incallback->foreach;
 932         ypresp_data = (void *)incallback->data;
 933
 934         if (clnt_call(clnt, YPPROC_ALL,
 935                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 936                 (xdrproc_t)xdr_ypresp_all_seq, &status, tv) != RPC_SUCCESS) {
 937                         clnt_perror(clnt, "yp_all: clnt_call");
 938                         clnt_destroy(clnt);
 939                         _yp_unbind(ysd);
 940                         retries++;
 941                         goto again;
 942         }
 943
 944         clnt_destroy(clnt);
 945         savstat = status;
 946         xdr_free((xdrproc_t)xdr_ypresp_all_seq, &status);       /* not really needed... */
 947         YPUNLOCK();
 948         if (savstat != YP_NOMORE)
 949                 return (ypprot_err(savstat));
 950         return (0);
 951 }
 952
 953 int
 954 yp_order(char *indomain, char *inmap, int *outorder)
 955 {
 956         struct dom_binding *ysd;
 957         struct ypresp_order ypro;
 958         struct ypreq_nokey yprnk;
 959         struct timeval tv;
 960         int r;
 961
 962         /* Sanity check */
 963
 964         if (indomain == NULL || !strlen(indomain) ||
 965             inmap == NULL || !strlen(inmap))
 966                 return (YPERR_BADARGS);
 967
 968         YPLOCK();
 969 again:
 970         if (_yp_dobind(indomain, &ysd) != 0) {
 971                 YPUNLOCK();
 972                 return (YPERR_DOMAIN);
 973         }
 974
 975         tv.tv_sec = _yplib_timeout;
 976         tv.tv_usec = 0;
 977
 978         yprnk.domain = indomain;
 979         yprnk.map = inmap;
 980
 981         bzero((char *)(char *)&ypro, sizeof ypro);
 982
 983         r = clnt_call(ysd->dom_client, YPPROC_ORDER,
 984                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 985                 (xdrproc_t)xdr_ypresp_order, &ypro, tv);
 986
 987         /*
 988          * NIS+ in YP compat mode doesn't support the YPPROC_ORDER
 989          * procedure.
 990          */
 991         if (r == RPC_PROCUNAVAIL) {
 992                 YPUNLOCK();
 993                 return(YPERR_YPERR);
 994         }
 995
 996         if (r != RPC_SUCCESS) {
 997                 clnt_perror(ysd->dom_client, "yp_order: clnt_call");
 998                 _yp_unbind(ysd);
 999                 goto again;
1000         }
1001
1002         if (!(r = ypprot_err(ypro.stat))) {
1003                 *outorder = ypro.ordernum;
1004         }
1005
1006         xdr_free((xdrproc_t)xdr_ypresp_order, &ypro);
1007         YPUNLOCK();
1008         return (r);
1009 }
1010
1011 int
1012 yp_master(char *indomain, char *inmap, char **outname)
1013 {
1014         struct dom_binding *ysd;
1015         struct ypresp_master yprm;
1016         struct ypreq_nokey yprnk;
1017         struct timeval tv;
1018         int r;
1019
1020         /* Sanity check */
1021
1022         if (indomain == NULL || !strlen(indomain) ||
1023             inmap == NULL || !strlen(inmap))
1024                 return (YPERR_BADARGS);
1025         YPLOCK();
1026 again:
1027         if (_yp_dobind(indomain, &ysd) != 0) {
1028                 YPUNLOCK();
1029                 return (YPERR_DOMAIN);
1030         }
1031
1032         tv.tv_sec = _yplib_timeout;
1033         tv.tv_usec = 0;
1034
1035         yprnk.domain = indomain;
1036         yprnk.map = inmap;
1037
1038         bzero((char *)&yprm, sizeof yprm);
1039
1040         r = clnt_call(ysd->dom_client, YPPROC_MASTER,
1041                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
1042                 (xdrproc_t)xdr_ypresp_master, &yprm, tv);
1043         if (r != RPC_SUCCESS) {
1044                 clnt_perror(ysd->dom_client, "yp_master: clnt_call");
1045                 _yp_unbind(ysd);
1046                 goto again;
1047         }
1048
1049         if (!(r = ypprot_err(yprm.stat))) {
1050                 *outname = (char *)strdup(yprm.peer);
1051         }
1052
1053         xdr_free((xdrproc_t)xdr_ypresp_master, &yprm);
1054         YPUNLOCK();
1055         return (r);
1056 }
1057
1058 int
1059 yp_maplist(char *indomain, struct ypmaplist **outmaplist)
1060 {
1061         struct dom_binding *ysd;
1062         struct ypresp_maplist ypml;
1063         struct timeval tv;
1064         int r;
1065
1066         /* Sanity check */
1067
1068         if (indomain == NULL || !strlen(indomain))
1069                 return (YPERR_BADARGS);
1070
1071         YPLOCK();
1072 again:
1073         if (_yp_dobind(indomain, &ysd) != 0) {
1074                 YPUNLOCK();
1075                 return (YPERR_DOMAIN);
1076         }
1077
1078         tv.tv_sec = _yplib_timeout;
1079         tv.tv_usec = 0;
1080
1081         bzero((char *)&ypml, sizeof ypml);
1082
1083         r = clnt_call(ysd->dom_client, YPPROC_MAPLIST,
1084                 (xdrproc_t)xdr_domainname, &indomain,
1085                 (xdrproc_t)xdr_ypresp_maplist, &ypml,tv);
1086         if (r != RPC_SUCCESS) {
1087                 clnt_perror(ysd->dom_client, "yp_maplist: clnt_call");
1088                 _yp_unbind(ysd);
1089                 goto again;
1090         }
1091         if (!(r = ypprot_err(ypml.stat))) {
1092                 *outmaplist = ypml.maps;
1093         }
1094
1095         /* NO: xdr_free((xdrproc_t)xdr_ypresp_maplist, &ypml);*/
1096         YPUNLOCK();
1097         return (r);
1098 }
1099
1100 const char *
1101 yperr_string(int incode)
1102 {
1103         static char err[80];
1104
1105         switch (incode) {
1106         case 0:
1107                 return ("Success");
1108         case YPERR_BADARGS:
1109                 return ("Request arguments bad");
1110         case YPERR_RPC:
1111                 return ("RPC failure");
1112         case YPERR_DOMAIN:
1113                 return ("Can't bind to server which serves this domain");
1114         case YPERR_MAP:
1115                 return ("No such map in server's domain");
1116         case YPERR_KEY:
1117                 return ("No such key in map");
1118         case YPERR_YPERR:
1119                 return ("YP server error");
1120         case YPERR_RESRC:
1121                 return ("Local resource allocation failure");
1122         case YPERR_NOMORE:
1123                 return ("No more records in map database");
1124         case YPERR_PMAP:
1125                 return ("Can't communicate with portmapper");
1126         case YPERR_YPBIND:
1127                 return ("Can't communicate with ypbind");
1128         case YPERR_YPSERV:
1129                 return ("Can't communicate with ypserv");
1130         case YPERR_NODOM:
1131                 return ("Local domain name not set");
1132         case YPERR_BADDB:
1133                 return ("Server data base is bad");
1134         case YPERR_VERS:
1135                 return ("YP server version mismatch - server can't supply service.");
1136         case YPERR_ACCESS:
1137                 return ("Access violation");
1138         case YPERR_BUSY:
1139                 return ("Database is busy");
1140         }
1141         sprintf(err, "YP unknown error %d\n", incode);
1142         return (err);
1143 }
1144
1145 int
1146 ypprot_err(unsigned int incode)
1147 {
1148         switch (incode) {
1149         case YP_TRUE:
1150                 return (0);
1151         case YP_FALSE:
1152                 return (YPERR_YPBIND);
1153         case YP_NOMORE:
1154                 return (YPERR_NOMORE);
1155         case YP_NOMAP:
1156                 return (YPERR_MAP);
1157         case YP_NODOM:
1158                 return (YPERR_DOMAIN);
1159         case YP_NOKEY:
1160                 return (YPERR_KEY);
1161         case YP_BADOP:
1162                 return (YPERR_YPERR);
1163         case YP_BADDB:
1164                 return (YPERR_BADDB);
1165         case YP_YPERR:
1166                 return (YPERR_YPERR);
1167         case YP_BADARGS:
1168                 return (YPERR_BADARGS);
1169         case YP_VERS:
1170                 return (YPERR_VERS);
1171         }
1172         return (YPERR_YPERR);
1173 }
1174
1175 int
1176 _yp_check(char **dom)
1177 {
1178         char *unused;
1179
1180         YPLOCK();
1181         if (_yp_domain[0]=='\0')
1182                 if (yp_get_default_domain_locked(&unused)) {
1183                         YPUNLOCK();
1184                         return (0);
1185                 }
1186
1187         if (dom)
1188                 *dom = _yp_domain;
1189
1190         if (yp_bind_locked(_yp_domain) == 0) {
1191                 yp_unbind_locked(_yp_domain);
1192                 YPUNLOCK();
1193                 return (1);
1194         }
1195         YPUNLOCK();
1196         return (0);
1197 }