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/socket.h>
  38 #include <sys/file.h>
  39 #include <sys/uio.h>
  40 #include <arpa/inet.h>
  41 #include <errno.h>
  42 #include <stdio.h>
  43 #include <string.h>
  44 #include <stdlib.h>
  45 #include <unistd.h>
  46 #include <rpc/rpc.h>
  47 #include <rpc/xdr.h>
  48 #include <rpcsvc/yp.h>
  49 #include "un-namespace.h"
  50 #include "libc_private.h"
  51
  52 /*
  53  * We have to define these here due to clashes between yp_prot.h and
  54  * yp.h.
  55  */
  56
  57 #define YPMATCHCACHE
  58
  59 #ifdef YPMATCHCACHE
  60 struct ypmatch_ent {
  61         char                    *ypc_map;
  62         keydat                  ypc_key;
  63         valdat                  ypc_val;
  64         time_t                  ypc_expire_t;
  65         struct ypmatch_ent      *ypc_next;
  66 };
  67 #define YPLIB_MAXCACHE  5       /* At most 5 entries */
  68 #define YPLIB_EXPIRE    5       /* Expire after 5 seconds */
  69 #endif
  70
  71 struct dom_binding {
  72         struct dom_binding *dom_pnext;
  73         char dom_domain[YPMAXDOMAIN + 1];
  74         struct sockaddr_in dom_server_addr;
  75         u_short dom_server_port;
  76         int dom_socket;
  77         CLIENT *dom_client;
  78         u_short dom_local_port; /* now I finally know what this is for. */
  79         long dom_vers;
  80 #ifdef YPMATCHCACHE
  81         struct ypmatch_ent *cache;
  82         int ypmatch_cachecnt;
  83 #endif
  84 };
  85
  86 #include <rpcsvc/ypclnt.h>
  87
  88 #ifndef BINDINGDIR
  89 #define BINDINGDIR "/var/yp/binding"
  90 #endif
  91 #define MAX_RETRIES 20
  92
  93 extern bool_t xdr_domainname(), xdr_ypbind_resp();
  94 extern bool_t xdr_ypreq_key(), xdr_ypresp_val();
  95 extern bool_t xdr_ypreq_nokey(), xdr_ypresp_key_val();
  96 extern bool_t xdr_ypresp_all(), xdr_ypresp_all_seq();
  97 extern bool_t xdr_ypresp_master();
  98
  99 int (*ypresp_allfn)();
 100 void *ypresp_data;
 101
 102 static void _yp_unbind(struct dom_binding *);
 103 struct dom_binding *_ypbindlist;
 104 static char _yp_domain[MAXHOSTNAMELEN];
 105 int _yplib_timeout = 20;
 106
 107 static mutex_t _ypmutex = MUTEX_INITIALIZER;
 108 #define YPLOCK()        mutex_lock(&_ypmutex);
 109 #define YPUNLOCK()      mutex_unlock(&_ypmutex);
 110
 111 #ifdef YPMATCHCACHE
 112 static void
 113 ypmatch_cache_delete(struct dom_binding *ypdb, struct ypmatch_ent *prev,
 114     struct ypmatch_ent *cur)
 115 {
 116         if (prev == NULL)
 117                 ypdb->cache = cur->ypc_next;
 118         else
 119                 prev->ypc_next = cur->ypc_next;
 120
 121         free(cur->ypc_map);
 122         free(cur->ypc_key.keydat_val);
 123         free(cur->ypc_val.valdat_val);
 124         free(cur);
 125
 126         ypdb->ypmatch_cachecnt--;
 127
 128         return;
 129 }
 130
 131 static void
 132 ypmatch_cache_flush(struct dom_binding *ypdb)
 133 {
 134         struct ypmatch_ent      *n, *c = ypdb->cache;
 135
 136         while (c != NULL) {
 137                 n = c->ypc_next;
 138                 ypmatch_cache_delete(ypdb, NULL, c);
 139                 c = n;
 140         }
 141
 142         return;
 143 }
 144
 145 static void
 146 ypmatch_cache_expire(struct dom_binding *ypdb)
 147 {
 148         struct ypmatch_ent      *c = ypdb->cache;
 149         struct ypmatch_ent      *n, *p = NULL;
 150         time_t                  t;
 151
 152         time(&t);
 153
 154         while (c != NULL) {
 155                 if (t >= c->ypc_expire_t) {
 156                         n = c->ypc_next;
 157                         ypmatch_cache_delete(ypdb, p, c);
 158                         c = n;
 159                 } else {
 160                         p = c;
 161                         c = c->ypc_next;
 162                 }
 163         }
 164
 165         return;
 166 }
 167
 168 static void
 169 ypmatch_cache_insert(struct dom_binding *ypdb, char *map, keydat *key,
 170     valdat *val)
 171 {
 172         struct ypmatch_ent      *new;
 173
 174         /* Do an expire run to maybe open up a slot. */
 175         if (ypdb->ypmatch_cachecnt)
 176                 ypmatch_cache_expire(ypdb);
 177
 178         /*
 179          * If there are no slots free, then force an expire of
 180          * the least recently used entry.
 181          */
 182         if (ypdb->ypmatch_cachecnt >= YPLIB_MAXCACHE) {
 183                 struct ypmatch_ent      *o = NULL, *c = ypdb->cache;
 184                 time_t                  oldest = 0;
 185
 186                 oldest = ~oldest;
 187
 188                 while (c != NULL) {
 189                         if (c->ypc_expire_t < oldest) {
 190                                 oldest = c->ypc_expire_t;
 191                                 o = c;
 192                         }
 193                         c = c->ypc_next;
 194                 }
 195
 196                 if (o == NULL)
 197                         return;
 198                 o->ypc_expire_t = 0;
 199                 ypmatch_cache_expire(ypdb);
 200         }
 201
 202         new = malloc(sizeof(struct ypmatch_ent));
 203         if (new == NULL)
 204                 return;
 205
 206         new->ypc_map = strdup(map);
 207         if (new->ypc_map == NULL) {
 208                 free(new);
 209                 return;
 210         }
 211         new->ypc_key.keydat_val = malloc(key->keydat_len);
 212         if (new->ypc_key.keydat_val == NULL) {
 213                 free(new->ypc_map);
 214                 free(new);
 215                 return;
 216         }
 217         new->ypc_val.valdat_val = malloc(val->valdat_len);
 218         if (new->ypc_val.valdat_val == NULL) {
 219                 free(new->ypc_val.valdat_val);
 220                 free(new->ypc_map);
 221                 free(new);
 222                 return;
 223         }
 224
 225         new->ypc_expire_t = time(NULL) + YPLIB_EXPIRE;
 226         new->ypc_key.keydat_len = key->keydat_len;
 227         new->ypc_val.valdat_len = val->valdat_len;
 228         bcopy(key->keydat_val, new->ypc_key.keydat_val, key->keydat_len);
 229         bcopy(val->valdat_val, new->ypc_val.valdat_val, val->valdat_len);
 230
 231         new->ypc_next = ypdb->cache;
 232         ypdb->cache = new;
 233
 234         ypdb->ypmatch_cachecnt++;
 235
 236         return;
 237 }
 238
 239 static bool_t
 240 ypmatch_cache_lookup(struct dom_binding *ypdb, char *map, keydat *key,
 241     valdat *val)
 242 {
 243         struct ypmatch_ent      *c;
 244
 245         ypmatch_cache_expire(ypdb);
 246
 247         for (c = ypdb->cache; c != NULL; c = c->ypc_next) {
 248                 if (strcmp(map, c->ypc_map))
 249                         continue;
 250                 if (key->keydat_len != c->ypc_key.keydat_len)
 251                         continue;
 252                 if (bcmp(key->keydat_val, c->ypc_key.keydat_val,
 253                                 key->keydat_len))
 254                         continue;
 255         }
 256
 257         if (c == NULL)
 258                 return(FALSE);
 259
 260         val->valdat_len = c->ypc_val.valdat_len;
 261         val->valdat_val = c->ypc_val.valdat_val;
 262
 263         return(TRUE);
 264 }
 265 #endif
 266
 267 const char *
 268 ypbinderr_string(int incode)
 269 {
 270         static char err[80];
 271         switch (incode) {
 272         case 0:
 273                 return ("Success");
 274         case YPBIND_ERR_ERR:
 275                 return ("Internal ypbind error");
 276         case YPBIND_ERR_NOSERV:
 277                 return ("Domain not bound");
 278         case YPBIND_ERR_RESC:
 279                 return ("System resource allocation failure");
 280         }
 281         sprintf(err, "Unknown ypbind error: #%d\n", incode);
 282         return (err);
 283 }
 284
 285 int
 286 _yp_dobind(char *dom, struct dom_binding **ypdb)
 287 {
 288         static pid_t pid = -1;
 289         char path[MAXPATHLEN];
 290         struct dom_binding *ysd, *ysd2;
 291         struct ypbind_resp ypbr;
 292         struct timeval tv;
 293         struct sockaddr_in clnt_sin;
 294         int clnt_sock, fd;
 295         pid_t gpid;
 296         CLIENT *client;
 297         int new = 0, r;
 298         int retries = 0;
 299         struct sockaddr_in check;
 300         socklen_t checklen = sizeof(struct sockaddr_in);
 301
 302         /* Not allowed; bad doggie. Bad. */
 303         if (strchr(dom, '/') != NULL)
 304                 return(YPERR_BADARGS);
 305
 306         gpid = getpid();
 307         if (!(pid == -1 || pid == gpid)) {
 308                 ysd = _ypbindlist;
 309                 while (ysd) {
 310                         if (ysd->dom_client != NULL)
 311                                 _yp_unbind(ysd);
 312                         ysd2 = ysd->dom_pnext;
 313                         free(ysd);
 314                         ysd = ysd2;
 315                 }
 316                 _ypbindlist = NULL;
 317         }
 318         pid = gpid;
 319
 320         if (ypdb != NULL)
 321                 *ypdb = NULL;
 322
 323         if (dom == NULL || strlen(dom) == 0)
 324                 return (YPERR_BADARGS);
 325
 326         for (ysd = _ypbindlist; ysd; ysd = ysd->dom_pnext)
 327                 if (strcmp(dom, ysd->dom_domain) == 0)
 328                         break;
 329
 330
 331         if (ysd == NULL) {
 332                 ysd = (struct dom_binding *)malloc(sizeof *ysd);
 333                 if (ysd == NULL)
 334                         return (YPERR_RESRC);
 335                 bzero((char *)ysd, sizeof *ysd);
 336                 ysd->dom_socket = -1;
 337                 ysd->dom_vers = 0;
 338                 new = 1;
 339         } else {
 340         /* Check the socket -- may have been hosed by the caller. */
 341                 if (_getsockname(ysd->dom_socket, (struct sockaddr *)&check,
 342                     &checklen) == -1 || check.sin_family != AF_INET ||
 343                     check.sin_port != ysd->dom_local_port) {
 344                 /* Socket became bogus somehow... need to rebind. */
 345                         int save, sock;
 346
 347                         sock = ysd->dom_socket;
 348                         save = _dup(ysd->dom_socket);
 349                         if (ysd->dom_client != NULL)
 350                                 clnt_destroy(ysd->dom_client);
 351                         ysd->dom_vers = 0;
 352                         ysd->dom_client = NULL;
 353                         sock = _dup2(save, sock);
 354                         _close(save);
 355                 }
 356         }
 357
 358 again:
 359         retries++;
 360         if (retries > MAX_RETRIES) {
 361                 if (new)
 362                         free(ysd);
 363                 return(YPERR_YPBIND);
 364         }
 365 #ifdef BINDINGDIR
 366         if (ysd->dom_vers == 0) {
 367                 /*
 368                  * We're trying to make a new binding: zorch the
 369                  * existing handle now (if any).
 370                  */
 371                 if (ysd->dom_client != NULL) {
 372                         clnt_destroy(ysd->dom_client);
 373                         ysd->dom_client = NULL;
 374                         ysd->dom_socket = -1;
 375                 }
 376                 snprintf(path, sizeof(path), "%s/%s.%d", BINDINGDIR, dom, 2);
 377                 if ((fd = _open(path, O_RDONLY | O_CLOEXEC)) == -1) {
 378                         /* no binding file, YP is dead. */
 379                         /* Try to bring it back to life. */
 380                         _close(fd);
 381                         goto skipit;
 382                 }
 383                 if (_flock(fd, LOCK_EX|LOCK_NB) == -1 && errno == EWOULDBLOCK) {
 384                         struct iovec iov[2];
 385                         struct ypbind_resp ybr;
 386                         u_short ypb_port;
 387
 388                         iov[0].iov_base = (caddr_t)&ypb_port;
 389                         iov[0].iov_len = sizeof ypb_port;
 390                         iov[1].iov_base = (caddr_t)&ybr;
 391                         iov[1].iov_len = sizeof ybr;
 392
 393                         r = _readv(fd, iov, 2);
 394                         if (r != iov[0].iov_len + iov[1].iov_len) {
 395                                 _close(fd);
 396                                 ysd->dom_vers = -1;
 397                                 goto again;
 398                         }
 399
 400                         bzero(&ysd->dom_server_addr, sizeof ysd->dom_server_addr);
 401                         ysd->dom_server_addr.sin_family = AF_INET;
 402                         ysd->dom_server_addr.sin_len = sizeof(struct sockaddr_in);
 403                         bcopy(&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr,
 404                             &ysd->dom_server_addr.sin_addr.s_addr,
 405                             sizeof(ysd->dom_server_addr.sin_addr.s_addr));
 406                         bcopy(&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port,
 407                             &ysd->dom_server_addr.sin_port,
 408                             sizeof(ysd->dom_server_addr.sin_port));
 409
 410                         ysd->dom_server_port = ysd->dom_server_addr.sin_port;
 411                         _close(fd);
 412                         goto gotit;
 413                 } else {
 414                         /* no lock on binding file, YP is dead. */
 415                         /* Try to bring it back to life. */
 416                         _close(fd);
 417                         goto skipit;
 418                 }
 419         }
 420 skipit:
 421 #endif
 422         if (ysd->dom_vers == -1 || ysd->dom_vers == 0) {
 423                 /*
 424                  * We're trying to make a new binding: zorch the
 425                  * existing handle now (if any).
 426                  */
 427                 if (ysd->dom_client != NULL) {
 428                         clnt_destroy(ysd->dom_client);
 429                         ysd->dom_client = NULL;
 430                         ysd->dom_socket = -1;
 431                 }
 432                 bzero((char *)&clnt_sin, sizeof clnt_sin);
 433                 clnt_sin.sin_family = AF_INET;
 434                 clnt_sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 435
 436                 clnt_sock = RPC_ANYSOCK;
 437                 client = clnttcp_create(&clnt_sin, YPBINDPROG, YPBINDVERS, &clnt_sock,
 438                         0, 0);
 439                 if (client == NULL) {
 440                         /*
 441                          * These conditions indicate ypbind just isn't
 442                          * alive -- we probably don't want to shoot our
 443                          * mouth off in this case; instead generate error
 444                          * messages only for really exotic problems.
 445                          */
 446                         if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED &&
 447                            (rpc_createerr.cf_stat != RPC_SYSTEMERROR &&
 448                            rpc_createerr.cf_error.re_errno == ECONNREFUSED))
 449                                 clnt_pcreateerror("clnttcp_create");
 450                         if (new)
 451                                 free(ysd);
 452                         return (YPERR_YPBIND);
 453                 }
 454
 455                 /*
 456                  * Check the port number -- should be < IPPORT_RESERVED.
 457                  * If not, it's possible someone has registered a bogus
 458                  * ypbind with the portmapper and is trying to trick us.
 459                  */
 460                 if (ntohs(clnt_sin.sin_port) >= IPPORT_RESERVED) {
 461                         if (client != NULL)
 462                                 clnt_destroy(client);
 463                         if (new)
 464                                 free(ysd);
 465                         return(YPERR_YPBIND);
 466                 }
 467                 tv.tv_sec = _yplib_timeout/2;
 468                 tv.tv_usec = 0;
 469                 r = clnt_call(client, YPBINDPROC_DOMAIN,
 470                         (xdrproc_t)xdr_domainname, &dom,
 471                         (xdrproc_t)xdr_ypbind_resp, &ypbr, tv);
 472                 if (r != RPC_SUCCESS) {
 473                         clnt_destroy(client);
 474                         ysd->dom_vers = -1;
 475                         if (r == RPC_PROGUNAVAIL || r == RPC_PROCUNAVAIL) {
 476                                 if (new)
 477                                         free(ysd);
 478                                 return(YPERR_YPBIND);
 479                         }
 480                         fprintf(stderr,
 481                         "YP: server for domain %s not responding, retrying\n", dom);
 482                         goto again;
 483                 } else {
 484                         if (ypbr.ypbind_status != YPBIND_SUCC_VAL) {
 485                                 struct timespec time_to_sleep, time_remaining;
 486
 487                                 clnt_destroy(client);
 488                                 ysd->dom_vers = -1;
 489
 490                                 time_to_sleep.tv_sec = _yplib_timeout/2;
 491                                 time_to_sleep.tv_nsec = 0;
 492                                 _nanosleep(&time_to_sleep,
 493                                     &time_remaining);
 494                                 goto again;
 495                         }
 496                 }
 497                 clnt_destroy(client);
 498
 499                 bzero((char *)&ysd->dom_server_addr, sizeof ysd->dom_server_addr);
 500                 ysd->dom_server_addr.sin_family = AF_INET;
 501                 bcopy(&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port,
 502                     &ysd->dom_server_addr.sin_port,
 503                     sizeof(ysd->dom_server_addr.sin_port));
 504                 bcopy(&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr,
 505                     &ysd->dom_server_addr.sin_addr.s_addr,
 506                     sizeof(ysd->dom_server_addr.sin_addr.s_addr));
 507
 508                 /*
 509                  * We could do a reserved port check here too, but this
 510                  * could pose compatibility problems. The local ypbind is
 511                  * supposed to decide whether or not to trust yp servers
 512                  * on insecure ports. For now, we trust its judgement.
 513                  */
 514                 ysd->dom_server_port =
 515                         *(u_short *)&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port;
 516 gotit:
 517                 ysd->dom_vers = YPVERS;
 518                 strlcpy(ysd->dom_domain, dom, sizeof(ysd->dom_domain));
 519         }
 520
 521         /* Don't rebuild the connection to the server unless we have to. */
 522         if (ysd->dom_client == NULL) {
 523                 tv.tv_sec = _yplib_timeout/2;
 524                 tv.tv_usec = 0;
 525                 ysd->dom_socket = RPC_ANYSOCK;
 526                 ysd->dom_client = clntudp_bufcreate(&ysd->dom_server_addr,
 527                         YPPROG, YPVERS, tv, &ysd->dom_socket, 1280, 2304);
 528                 if (ysd->dom_client == NULL) {
 529                         clnt_pcreateerror("clntudp_create");
 530                         ysd->dom_vers = -1;
 531                         goto again;
 532                 }
 533                 if (_fcntl(ysd->dom_socket, F_SETFD, 1) == -1)
 534                         perror("fcntl: F_SETFD");
 535                 /*
 536                  * We want a port number associated with this socket
 537                  * so that we can check its authenticity later.
 538                  */
 539                 checklen = sizeof(struct sockaddr_in);
 540                 bzero((char *)&check, checklen);
 541                 _bind(ysd->dom_socket, (struct sockaddr *)&check, checklen);
 542                 check.sin_family = AF_INET;
 543                 if (!_getsockname(ysd->dom_socket,
 544                     (struct sockaddr *)&check, &checklen)) {
 545                         ysd->dom_local_port = check.sin_port;
 546                 } else {
 547                         clnt_destroy(ysd->dom_client);
 548                         if (new)
 549                                 free(ysd);
 550                         return(YPERR_YPBIND);
 551                 }
 552         }
 553
 554         if (new) {
 555                 ysd->dom_pnext = _ypbindlist;
 556                 _ypbindlist = ysd;
 557         }
 558
 559         /*
 560          * Set low retry timeout to realistically handle UDP packet
 561          * loss for YP packet bursts.
 562          */
 563         tv.tv_sec = 1;
 564         tv.tv_usec = 0;
 565         clnt_control(ysd->dom_client, CLSET_RETRY_TIMEOUT, (char*)&tv);
 566
 567         if (ypdb != NULL)
 568                 *ypdb = ysd;
 569         return (0);
 570 }
 571
 572 static void
 573 _yp_unbind(struct dom_binding *ypb)
 574 {
 575         struct sockaddr_in check;
 576         socklen_t checklen = sizeof(struct sockaddr_in);
 577
 578         if (ypb->dom_client != NULL) {
 579                 /* Check the socket -- may have been hosed by the caller. */
 580                 if (_getsockname(ypb->dom_socket, (struct sockaddr *)&check,
 581                 &checklen) == -1 || check.sin_family != AF_INET ||
 582                 check.sin_port != ypb->dom_local_port) {
 583                         int save, sock;
 584
 585                         sock = ypb->dom_socket;
 586                         save = _dup(ypb->dom_socket);
 587                         clnt_destroy(ypb->dom_client);
 588                         sock = _dup2(save, sock);
 589                         _close(save);
 590                 } else
 591                         clnt_destroy(ypb->dom_client);
 592         }
 593
 594         ypb->dom_client = NULL;
 595         ypb->dom_socket = -1;
 596         ypb->dom_vers = -1;
 597 #ifdef YPMATCHCACHE
 598         ypmatch_cache_flush(ypb);
 599 #endif
 600 }
 601
 602 static int
 603 yp_bind_locked(char *dom)
 604 {
 605         return (_yp_dobind(dom, NULL));
 606 }
 607
 608 int
 609 yp_bind(char *dom)
 610 {
 611         int r;
 612
 613         YPLOCK();
 614         r = yp_bind_locked(dom);
 615         YPUNLOCK();
 616         return (r);
 617 }
 618
 619 static void
 620 yp_unbind_locked(char *dom)
 621 {
 622         struct dom_binding *ypb, *ypbp;
 623
 624         ypbp = NULL;
 625         for (ypb = _ypbindlist; ypb; ypb = ypb->dom_pnext) {
 626                 if (strcmp(dom, ypb->dom_domain) == 0) {
 627                         _yp_unbind(ypb);
 628                         if (ypbp)
 629                                 ypbp->dom_pnext = ypb->dom_pnext;
 630                         else
 631                                 _ypbindlist = ypb->dom_pnext;
 632                         free(ypb);
 633                         return;
 634                 }
 635                 ypbp = ypb;
 636         }
 637         return;
 638 }
 639
 640 void
 641 yp_unbind(char *dom)
 642 {
 643         YPLOCK();
 644         yp_unbind_locked(dom);
 645         YPUNLOCK();
 646 }
 647
 648 int
 649 yp_match(char *indomain, char *inmap, const char *inkey, int inkeylen,
 650     char **outval, int *outvallen)
 651 {
 652         struct dom_binding *ysd;
 653         struct ypresp_val yprv;
 654         struct timeval tv;
 655         struct ypreq_key yprk;
 656         int r;
 657         int retries = 0;
 658         *outval = NULL;
 659         *outvallen = 0;
 660
 661         /* Sanity check */
 662
 663         if (inkey == NULL || !strlen(inkey) || inkeylen <= 0 ||
 664             inmap == NULL || !strlen(inmap) ||
 665             indomain == NULL || !strlen(indomain))
 666                 return (YPERR_BADARGS);
 667
 668         YPLOCK();
 669         if (_yp_dobind(indomain, &ysd) != 0) {
 670                 YPUNLOCK();
 671                 return(YPERR_DOMAIN);
 672         }
 673
 674         yprk.domain = indomain;
 675         yprk.map = inmap;
 676         yprk.key.keydat_val = (char *)inkey;
 677         yprk.key.keydat_len = inkeylen;
 678
 679 #ifdef YPMATCHCACHE
 680         if (ypmatch_cache_lookup(ysd, yprk.map, &yprk.key, &yprv.val) == TRUE) {
 681 /*
 682         if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
 683             inkeylen, &yprv.val.valdat_val, &yprv.val.valdat_len)) {
 684 */
 685                 *outvallen = yprv.val.valdat_len;
 686                 *outval = (char *)malloc(*outvallen+1);
 687                 if (*outval == NULL) {
 688                         _yp_unbind(ysd);
 689                         *outvallen = 0;
 690                         YPUNLOCK();
 691                         return (YPERR_RESRC);
 692                 }
 693                 bcopy(yprv.val.valdat_val, *outval, *outvallen);
 694                 (*outval)[*outvallen] = '\0';
 695                 YPUNLOCK();
 696                 return (0);
 697         }
 698         _yp_unbind(ysd);
 699 #endif
 700
 701 again:
 702         if (retries > MAX_RETRIES) {
 703                 YPUNLOCK();
 704                 return (YPERR_RPC);
 705         }
 706
 707         if (_yp_dobind(indomain, &ysd) != 0) {
 708                 YPUNLOCK();
 709                 return (YPERR_DOMAIN);
 710         }
 711
 712         tv.tv_sec = _yplib_timeout;
 713         tv.tv_usec = 0;
 714
 715         bzero((char *)&yprv, sizeof yprv);
 716
 717         r = clnt_call(ysd->dom_client, YPPROC_MATCH,
 718                 (xdrproc_t)xdr_ypreq_key, &yprk,
 719                 (xdrproc_t)xdr_ypresp_val, &yprv, tv);
 720         if (r != RPC_SUCCESS) {
 721                 clnt_perror(ysd->dom_client, "yp_match: clnt_call");
 722                 _yp_unbind(ysd);
 723                 retries++;
 724                 goto again;
 725         }
 726
 727         if (!(r = ypprot_err(yprv.stat))) {
 728                 *outvallen = yprv.val.valdat_len;
 729                 *outval = (char *)malloc(*outvallen+1);
 730                 if (*outval == NULL) {
 731                         _yp_unbind(ysd);
 732                         *outvallen = 0;
 733                         xdr_free((xdrproc_t)xdr_ypresp_val, &yprv);
 734                         YPUNLOCK();
 735                         return (YPERR_RESRC);
 736                 }
 737                 bcopy(yprv.val.valdat_val, *outval, *outvallen);
 738                 (*outval)[*outvallen] = '\0';
 739 #ifdef YPMATCHCACHE
 740                 ypmatch_cache_insert(ysd, yprk.map, &yprk.key, &yprv.val);
 741 #endif
 742         }
 743
 744         xdr_free((xdrproc_t)xdr_ypresp_val, &yprv);
 745         YPUNLOCK();
 746         return (r);
 747 }
 748
 749 static int
 750 yp_get_default_domain_locked(char **domp)
 751 {
 752         *domp = NULL;
 753         if (_yp_domain[0] == '\0')
 754                 if (getdomainname(_yp_domain, sizeof _yp_domain))
 755                         return (YPERR_NODOM);
 756         *domp = _yp_domain;
 757         return (0);
 758 }
 759
 760 int
 761 yp_get_default_domain(char **domp)
 762 {
 763         int r;
 764
 765         YPLOCK();
 766         r = yp_get_default_domain_locked(domp);
 767         YPUNLOCK();
 768         return (r);
 769 }
 770
 771 int
 772 yp_first(char *indomain, char *inmap, char **outkey, int *outkeylen,
 773     char **outval, int *outvallen)
 774 {
 775         struct ypresp_key_val yprkv;
 776         struct ypreq_nokey yprnk;
 777         struct dom_binding *ysd;
 778         struct timeval tv;
 779         int r;
 780         int retries = 0;
 781         /* Sanity check */
 782
 783         if (indomain == NULL || !strlen(indomain) ||
 784             inmap == NULL || !strlen(inmap))
 785                 return (YPERR_BADARGS);
 786
 787         *outkey = *outval = NULL;
 788         *outkeylen = *outvallen = 0;
 789
 790         YPLOCK();
 791 again:
 792         if (retries > MAX_RETRIES) {
 793                 YPUNLOCK();
 794                 return (YPERR_RPC);
 795         }
 796
 797         if (_yp_dobind(indomain, &ysd) != 0) {
 798                 YPUNLOCK();
 799                 return (YPERR_DOMAIN);
 800         }
 801
 802         tv.tv_sec = _yplib_timeout;
 803         tv.tv_usec = 0;
 804
 805         yprnk.domain = indomain;
 806         yprnk.map = inmap;
 807         bzero((char *)&yprkv, sizeof yprkv);
 808
 809         r = clnt_call(ysd->dom_client, YPPROC_FIRST,
 810                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 811                 (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
 812         if (r != RPC_SUCCESS) {
 813                 clnt_perror(ysd->dom_client, "yp_first: clnt_call");
 814                 _yp_unbind(ysd);
 815                 retries++;
 816                 goto again;
 817         }
 818         if (!(r = ypprot_err(yprkv.stat))) {
 819                 *outkeylen = yprkv.key.keydat_len;
 820                 *outkey = (char *)malloc(*outkeylen+1);
 821                 if (*outkey == NULL) {
 822                         _yp_unbind(ysd);
 823                         *outkeylen = 0;
 824                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 825                         YPUNLOCK();
 826                         return (YPERR_RESRC);
 827                 }
 828                 bcopy(yprkv.key.keydat_val, *outkey, *outkeylen);
 829                 (*outkey)[*outkeylen] = '\0';
 830                 *outvallen = yprkv.val.valdat_len;
 831                 *outval = (char *)malloc(*outvallen+1);
 832                 if (*outval == NULL) {
 833                         free(*outkey);
 834                         _yp_unbind(ysd);
 835                         *outkeylen = *outvallen = 0;
 836                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 837                         YPUNLOCK();
 838                         return (YPERR_RESRC);
 839                 }
 840                 bcopy(yprkv.val.valdat_val, *outval, *outvallen);
 841                 (*outval)[*outvallen] = '\0';
 842         }
 843
 844         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 845         YPUNLOCK();
 846         return (r);
 847 }
 848
 849 int
 850 yp_next(char *indomain, char *inmap, char *inkey, int inkeylen,
 851     char **outkey, int *outkeylen, char **outval, int *outvallen)
 852 {
 853         struct ypresp_key_val yprkv;
 854         struct ypreq_key yprk;
 855         struct dom_binding *ysd;
 856         struct timeval tv;
 857         int r;
 858         int retries = 0;
 859         /* Sanity check */
 860
 861         if (inkey == NULL || !strlen(inkey) || inkeylen <= 0 ||
 862             inmap == NULL || !strlen(inmap) ||
 863             indomain == NULL || !strlen(indomain))
 864                 return (YPERR_BADARGS);
 865
 866         *outkey = *outval = NULL;
 867         *outkeylen = *outvallen = 0;
 868
 869         YPLOCK();
 870 again:
 871         if (retries > MAX_RETRIES) {
 872                 YPUNLOCK();
 873                 return (YPERR_RPC);
 874         }
 875
 876         if (_yp_dobind(indomain, &ysd) != 0) {
 877                 YPUNLOCK();
 878                 return (YPERR_DOMAIN);
 879         }
 880
 881         tv.tv_sec = _yplib_timeout;
 882         tv.tv_usec = 0;
 883
 884         yprk.domain = indomain;
 885         yprk.map = inmap;
 886         yprk.key.keydat_val = inkey;
 887         yprk.key.keydat_len = inkeylen;
 888         bzero((char *)&yprkv, sizeof yprkv);
 889
 890         r = clnt_call(ysd->dom_client, YPPROC_NEXT,
 891                 (xdrproc_t)xdr_ypreq_key, &yprk,
 892                 (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
 893         if (r != RPC_SUCCESS) {
 894                 clnt_perror(ysd->dom_client, "yp_next: clnt_call");
 895                 _yp_unbind(ysd);
 896                 retries++;
 897                 goto again;
 898         }
 899         if (!(r = ypprot_err(yprkv.stat))) {
 900                 *outkeylen = yprkv.key.keydat_len;
 901                 *outkey = (char *)malloc(*outkeylen+1);
 902                 if (*outkey == NULL) {
 903                         _yp_unbind(ysd);
 904                         *outkeylen = 0;
 905                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 906                         YPUNLOCK();
 907                         return (YPERR_RESRC);
 908                 }
 909                 bcopy(yprkv.key.keydat_val, *outkey, *outkeylen);
 910                 (*outkey)[*outkeylen] = '\0';
 911                 *outvallen = yprkv.val.valdat_len;
 912                 *outval = (char *)malloc(*outvallen+1);
 913                 if (*outval == NULL) {
 914                         free(*outkey);
 915                         _yp_unbind(ysd);
 916                         *outkeylen = *outvallen = 0;
 917                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 918                         YPUNLOCK();
 919                         return (YPERR_RESRC);
 920                 }
 921                 bcopy(yprkv.val.valdat_val, *outval, *outvallen);
 922                 (*outval)[*outvallen] = '\0';
 923         }
 924
 925         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 926         YPUNLOCK();
 927         return (r);
 928 }
 929
 930 int
 931 yp_all(char *indomain, char *inmap, struct ypall_callback *incallback)
 932 {
 933         struct ypreq_nokey yprnk;
 934         struct dom_binding *ysd;
 935         struct timeval tv;
 936         struct sockaddr_in clnt_sin;
 937         CLIENT *clnt;
 938         u_long status, savstat;
 939         int clnt_sock;
 940         int retries = 0;
 941         /* Sanity check */
 942
 943         if (indomain == NULL || !strlen(indomain) ||
 944             inmap == NULL || !strlen(inmap))
 945                 return (YPERR_BADARGS);
 946
 947         YPLOCK();
 948 again:
 949         if (retries > MAX_RETRIES) {
 950                 YPUNLOCK();
 951                 return (YPERR_RPC);
 952         }
 953
 954         if (_yp_dobind(indomain, &ysd) != 0) {
 955                 YPUNLOCK();
 956                 return (YPERR_DOMAIN);
 957         }
 958
 959         tv.tv_sec = _yplib_timeout;
 960         tv.tv_usec = 0;
 961
 962         /* YPPROC_ALL manufactures its own channel to ypserv using TCP */
 963
 964         clnt_sock = RPC_ANYSOCK;
 965         clnt_sin = ysd->dom_server_addr;
 966         clnt_sin.sin_port = 0;
 967         clnt = clnttcp_create(&clnt_sin, YPPROG, YPVERS, &clnt_sock, 0, 0);
 968         if (clnt == NULL) {
 969                 YPUNLOCK();
 970                 printf("clnttcp_create failed\n");
 971                 return (YPERR_PMAP);
 972         }
 973
 974         yprnk.domain = indomain;
 975         yprnk.map = inmap;
 976         ypresp_allfn = incallback->foreach;
 977         ypresp_data = (void *)incallback->data;
 978
 979         if (clnt_call(clnt, YPPROC_ALL,
 980                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 981                 (xdrproc_t)xdr_ypresp_all_seq, &status, tv) != RPC_SUCCESS) {
 982                         clnt_perror(clnt, "yp_all: clnt_call");
 983                         clnt_destroy(clnt);
 984                         _yp_unbind(ysd);
 985                         retries++;
 986                         goto again;
 987         }
 988
 989         clnt_destroy(clnt);
 990         savstat = status;
 991         xdr_free((xdrproc_t)xdr_ypresp_all_seq, &status);       /* not really needed... */
 992         YPUNLOCK();
 993         if (savstat != YP_NOMORE)
 994                 return (ypprot_err(savstat));
 995         return (0);
 996 }
 997
 998 int
 999 yp_order(char *indomain, char *inmap, int *outorder)
1000 {
1001         struct dom_binding *ysd;
1002         struct ypresp_order ypro;
1003         struct ypreq_nokey yprnk;
1004         struct timeval tv;
1005         int r;
1006
1007         /* Sanity check */
1008
1009         if (indomain == NULL || !strlen(indomain) ||
1010             inmap == NULL || !strlen(inmap))
1011                 return (YPERR_BADARGS);
1012
1013         YPLOCK();
1014 again:
1015         if (_yp_dobind(indomain, &ysd) != 0) {
1016                 YPUNLOCK();
1017                 return (YPERR_DOMAIN);
1018         }
1019
1020         tv.tv_sec = _yplib_timeout;
1021         tv.tv_usec = 0;
1022
1023         yprnk.domain = indomain;
1024         yprnk.map = inmap;
1025
1026         bzero((char *)(char *)&ypro, sizeof ypro);
1027
1028         r = clnt_call(ysd->dom_client, YPPROC_ORDER,
1029                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
1030                 (xdrproc_t)xdr_ypresp_order, &ypro, tv);
1031
1032         /*
1033          * NIS+ in YP compat mode doesn't support the YPPROC_ORDER
1034          * procedure.
1035          */
1036         if (r == RPC_PROCUNAVAIL) {
1037                 YPUNLOCK();
1038                 return(YPERR_YPERR);
1039         }
1040
1041         if (r != RPC_SUCCESS) {
1042                 clnt_perror(ysd->dom_client, "yp_order: clnt_call");
1043                 _yp_unbind(ysd);
1044                 goto again;
1045         }
1046
1047         if (!(r = ypprot_err(ypro.stat))) {
1048                 *outorder = ypro.ordernum;
1049         }
1050
1051         xdr_free((xdrproc_t)xdr_ypresp_order, &ypro);
1052         YPUNLOCK();
1053         return (r);
1054 }
1055
1056 int
1057 yp_master(char *indomain, char *inmap, char **outname)
1058 {
1059         struct dom_binding *ysd;
1060         struct ypresp_master yprm;
1061         struct ypreq_nokey yprnk;
1062         struct timeval tv;
1063         int r;
1064
1065         /* Sanity check */
1066
1067         if (indomain == NULL || !strlen(indomain) ||
1068             inmap == NULL || !strlen(inmap))
1069                 return (YPERR_BADARGS);
1070         YPLOCK();
1071 again:
1072         if (_yp_dobind(indomain, &ysd) != 0) {
1073                 YPUNLOCK();
1074                 return (YPERR_DOMAIN);
1075         }
1076
1077         tv.tv_sec = _yplib_timeout;
1078         tv.tv_usec = 0;
1079
1080         yprnk.domain = indomain;
1081         yprnk.map = inmap;
1082
1083         bzero((char *)&yprm, sizeof yprm);
1084
1085         r = clnt_call(ysd->dom_client, YPPROC_MASTER,
1086                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
1087                 (xdrproc_t)xdr_ypresp_master, &yprm, tv);
1088         if (r != RPC_SUCCESS) {
1089                 clnt_perror(ysd->dom_client, "yp_master: clnt_call");
1090                 _yp_unbind(ysd);
1091                 goto again;
1092         }
1093
1094         if (!(r = ypprot_err(yprm.stat))) {
1095                 *outname = (char *)strdup(yprm.peer);
1096         }
1097
1098         xdr_free((xdrproc_t)xdr_ypresp_master, &yprm);
1099         YPUNLOCK();
1100         return (r);
1101 }
1102
1103 int
1104 yp_maplist(char *indomain, struct ypmaplist **outmaplist)
1105 {
1106         struct dom_binding *ysd;
1107         struct ypresp_maplist ypml;
1108         struct timeval tv;
1109         int r;
1110
1111         /* Sanity check */
1112
1113         if (indomain == NULL || !strlen(indomain))
1114                 return (YPERR_BADARGS);
1115
1116         YPLOCK();
1117 again:
1118         if (_yp_dobind(indomain, &ysd) != 0) {
1119                 YPUNLOCK();
1120                 return (YPERR_DOMAIN);
1121         }
1122
1123         tv.tv_sec = _yplib_timeout;
1124         tv.tv_usec = 0;
1125
1126         bzero((char *)&ypml, sizeof ypml);
1127
1128         r = clnt_call(ysd->dom_client, YPPROC_MAPLIST,
1129                 (xdrproc_t)xdr_domainname, &indomain,
1130                 (xdrproc_t)xdr_ypresp_maplist, &ypml,tv);
1131         if (r != RPC_SUCCESS) {
1132                 clnt_perror(ysd->dom_client, "yp_maplist: clnt_call");
1133                 _yp_unbind(ysd);
1134                 goto again;
1135         }
1136         if (!(r = ypprot_err(ypml.stat))) {
1137                 *outmaplist = ypml.maps;
1138         }
1139
1140         /* NO: xdr_free((xdrproc_t)xdr_ypresp_maplist, &ypml);*/
1141         YPUNLOCK();
1142         return (r);
1143 }
1144
1145 const char *
1146 yperr_string(int incode)
1147 {
1148         static char err[80];
1149
1150         switch (incode) {
1151         case 0:
1152                 return ("Success");
1153         case YPERR_BADARGS:
1154                 return ("Request arguments bad");
1155         case YPERR_RPC:
1156                 return ("RPC failure");
1157         case YPERR_DOMAIN:
1158                 return ("Can't bind to server which serves this domain");
1159         case YPERR_MAP:
1160                 return ("No such map in server's domain");
1161         case YPERR_KEY:
1162                 return ("No such key in map");
1163         case YPERR_YPERR:
1164                 return ("YP server error");
1165         case YPERR_RESRC:
1166                 return ("Local resource allocation failure");
1167         case YPERR_NOMORE:
1168                 return ("No more records in map database");
1169         case YPERR_PMAP:
1170                 return ("Can't communicate with portmapper");
1171         case YPERR_YPBIND:
1172                 return ("Can't communicate with ypbind");
1173         case YPERR_YPSERV:
1174                 return ("Can't communicate with ypserv");
1175         case YPERR_NODOM:
1176                 return ("Local domain name not set");
1177         case YPERR_BADDB:
1178                 return ("Server data base is bad");
1179         case YPERR_VERS:
1180                 return ("YP server version mismatch - server can't supply service.");
1181         case YPERR_ACCESS:
1182                 return ("Access violation");
1183         case YPERR_BUSY:
1184                 return ("Database is busy");
1185         }
1186         sprintf(err, "YP unknown error %d\n", incode);
1187         return (err);
1188 }
1189
1190 int
1191 ypprot_err(unsigned int incode)
1192 {
1193         switch (incode) {
1194         case YP_TRUE:
1195                 return (0);
1196         case YP_FALSE:
1197                 return (YPERR_YPBIND);
1198         case YP_NOMORE:
1199                 return (YPERR_NOMORE);
1200         case YP_NOMAP:
1201                 return (YPERR_MAP);
1202         case YP_NODOM:
1203                 return (YPERR_DOMAIN);
1204         case YP_NOKEY:
1205                 return (YPERR_KEY);
1206         case YP_BADOP:
1207                 return (YPERR_YPERR);
1208         case YP_BADDB:
1209                 return (YPERR_BADDB);
1210         case YP_YPERR:
1211                 return (YPERR_YPERR);
1212         case YP_BADARGS:
1213                 return (YPERR_BADARGS);
1214         case YP_VERS:
1215                 return (YPERR_VERS);
1216         }
1217         return (YPERR_YPERR);
1218 }
1219
1220 int
1221 _yp_check(char **dom)
1222 {
1223         char *unused;
1224
1225         YPLOCK();
1226         if (_yp_domain[0]=='\0')
1227                 if (yp_get_default_domain_locked(&unused)) {
1228                         YPUNLOCK();
1229                         return (0);
1230                 }
1231
1232         if (dom)
1233                 *dom = _yp_domain;
1234
1235         if (yp_bind_locked(_yp_domain) == 0) {
1236                 yp_unbind_locked(_yp_domain);
1237                 YPUNLOCK();
1238                 return (1);
1239         }
1240         YPUNLOCK();
1241         return (0);
1242 }