lib/libc/yp/yplib.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1992/3 Theo de Raadt <deraadt@fsa.ca>
   5  * Copyright (c) 1998 Bill Paul <wpaul@ctr.columbia.edu>
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. The name of the author may not be used to endorse or promote
  17  *    products derived from this software without specific prior written
  18  *    permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  21  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  22  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  24  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include "namespace.h"
  37 #include "reentrant.h"
  38 #include <sys/param.h>
  39 #include <sys/socket.h>
  40 #include <sys/file.h>
  41 #include <sys/uio.h>
  42 #include <arpa/inet.h>
  43 #include <errno.h>
  44 #include <stdio.h>
  45 #include <string.h>
  46 #include <stdlib.h>
  47 #include <unistd.h>
  48 #include <rpc/rpc.h>
  49 #include <rpc/xdr.h>
  50 #include <rpcsvc/yp.h>
  51 #include "un-namespace.h"
  52 #include "libc_private.h"
  53
  54 /*
  55  * We have to define these here due to clashes between yp_prot.h and
  56  * yp.h.
  57  */
  58
  59 #define YPMATCHCACHE
  60
  61 #ifdef YPMATCHCACHE
  62 struct ypmatch_ent {
  63         char                    *ypc_map;
  64         keydat                  ypc_key;
  65         valdat                  ypc_val;
  66         time_t                  ypc_expire_t;
  67         struct ypmatch_ent      *ypc_next;
  68 };
  69 #define YPLIB_MAXCACHE  5       /* At most 5 entries */
  70 #define YPLIB_EXPIRE    5       /* Expire after 5 seconds */
  71 #endif
  72
  73 struct dom_binding {
  74         struct dom_binding *dom_pnext;
  75         char dom_domain[YPMAXDOMAIN + 1];
  76         struct sockaddr_in dom_server_addr;
  77         u_short dom_server_port;
  78         int dom_socket;
  79         CLIENT *dom_client;
  80         u_short dom_local_port; /* now I finally know what this is for. */
  81         long dom_vers;
  82 #ifdef YPMATCHCACHE
  83         struct ypmatch_ent *cache;
  84         int ypmatch_cachecnt;
  85 #endif
  86 };
  87
  88 #include <rpcsvc/ypclnt.h>
  89
  90 #ifndef BINDINGDIR
  91 #define BINDINGDIR "/var/yp/binding"
  92 #endif
  93 #define MAX_RETRIES 20
  94
  95 extern bool_t xdr_domainname(), xdr_ypbind_resp();
  96 extern bool_t xdr_ypreq_key(), xdr_ypresp_val();
  97 extern bool_t xdr_ypreq_nokey(), xdr_ypresp_key_val();
  98 extern bool_t xdr_ypresp_all(), xdr_ypresp_all_seq();
  99 extern bool_t xdr_ypresp_master();
 100
 101 int (*ypresp_allfn)();
 102 void *ypresp_data;
 103
 104 static void _yp_unbind(struct dom_binding *);
 105 struct dom_binding *_ypbindlist;
 106 static char _yp_domain[MAXHOSTNAMELEN];
 107 int _yplib_timeout = 20;
 108
 109 static mutex_t _ypmutex = MUTEX_INITIALIZER;
 110 #define YPLOCK()        mutex_lock(&_ypmutex);
 111 #define YPUNLOCK()      mutex_unlock(&_ypmutex);
 112
 113 #ifdef YPMATCHCACHE
 114 static void
 115 ypmatch_cache_delete(struct dom_binding *ypdb, struct ypmatch_ent *prev,
 116     struct ypmatch_ent *cur)
 117 {
 118         if (prev == NULL)
 119                 ypdb->cache = cur->ypc_next;
 120         else
 121                 prev->ypc_next = cur->ypc_next;
 122
 123         free(cur->ypc_map);
 124         free(cur->ypc_key.keydat_val);
 125         free(cur->ypc_val.valdat_val);
 126         free(cur);
 127
 128         ypdb->ypmatch_cachecnt--;
 129
 130         return;
 131 }
 132
 133 static void
 134 ypmatch_cache_flush(struct dom_binding *ypdb)
 135 {
 136         struct ypmatch_ent      *n, *c = ypdb->cache;
 137
 138         while (c != NULL) {
 139                 n = c->ypc_next;
 140                 ypmatch_cache_delete(ypdb, NULL, c);
 141                 c = n;
 142         }
 143
 144         return;
 145 }
 146
 147 static void
 148 ypmatch_cache_expire(struct dom_binding *ypdb)
 149 {
 150         struct ypmatch_ent      *c = ypdb->cache;
 151         struct ypmatch_ent      *n, *p = NULL;
 152         time_t                  t;
 153
 154         time(&t);
 155
 156         while (c != NULL) {
 157                 if (t >= c->ypc_expire_t) {
 158                         n = c->ypc_next;
 159                         ypmatch_cache_delete(ypdb, p, c);
 160                         c = n;
 161                 } else {
 162                         p = c;
 163                         c = c->ypc_next;
 164                 }
 165         }
 166
 167         return;
 168 }
 169
 170 static void
 171 ypmatch_cache_insert(struct dom_binding *ypdb, char *map, keydat *key,
 172     valdat *val)
 173 {
 174         struct ypmatch_ent      *new;
 175
 176         /* Do an expire run to maybe open up a slot. */
 177         if (ypdb->ypmatch_cachecnt)
 178                 ypmatch_cache_expire(ypdb);
 179
 180         /*
 181          * If there are no slots free, then force an expire of
 182          * the least recently used entry.
 183          */
 184         if (ypdb->ypmatch_cachecnt >= YPLIB_MAXCACHE) {
 185                 struct ypmatch_ent      *o = NULL, *c = ypdb->cache;
 186                 time_t                  oldest = 0;
 187
 188                 oldest = ~oldest;
 189
 190                 while (c != NULL) {
 191                         if (c->ypc_expire_t < oldest) {
 192                                 oldest = c->ypc_expire_t;
 193                                 o = c;
 194                         }
 195                         c = c->ypc_next;
 196                 }
 197
 198                 if (o == NULL)
 199                         return;
 200                 o->ypc_expire_t = 0;
 201                 ypmatch_cache_expire(ypdb);
 202         }
 203
 204         new = malloc(sizeof(struct ypmatch_ent));
 205         if (new == NULL)
 206                 return;
 207
 208         new->ypc_map = strdup(map);
 209         if (new->ypc_map == NULL) {
 210                 free(new);
 211                 return;
 212         }
 213         new->ypc_key.keydat_val = malloc(key->keydat_len);
 214         if (new->ypc_key.keydat_val == NULL) {
 215                 free(new->ypc_map);
 216                 free(new);
 217                 return;
 218         }
 219         new->ypc_val.valdat_val = malloc(val->valdat_len);
 220         if (new->ypc_val.valdat_val == NULL) {
 221                 free(new->ypc_val.valdat_val);
 222                 free(new->ypc_map);
 223                 free(new);
 224                 return;
 225         }
 226
 227         new->ypc_expire_t = time(NULL) + YPLIB_EXPIRE;
 228         new->ypc_key.keydat_len = key->keydat_len;
 229         new->ypc_val.valdat_len = val->valdat_len;
 230         bcopy(key->keydat_val, new->ypc_key.keydat_val, key->keydat_len);
 231         bcopy(val->valdat_val, new->ypc_val.valdat_val, val->valdat_len);
 232
 233         new->ypc_next = ypdb->cache;
 234         ypdb->cache = new;
 235
 236         ypdb->ypmatch_cachecnt++;
 237
 238         return;
 239 }
 240
 241 static bool_t
 242 ypmatch_cache_lookup(struct dom_binding *ypdb, char *map, keydat *key,
 243     valdat *val)
 244 {
 245         struct ypmatch_ent      *c;
 246
 247         ypmatch_cache_expire(ypdb);
 248
 249         for (c = ypdb->cache; c != NULL; c = c->ypc_next) {
 250                 if (strcmp(map, c->ypc_map))
 251                         continue;
 252                 if (key->keydat_len != c->ypc_key.keydat_len)
 253                         continue;
 254                 if (bcmp(key->keydat_val, c->ypc_key.keydat_val,
 255                                 key->keydat_len))
 256                         continue;
 257         }
 258
 259         if (c == NULL)
 260                 return(FALSE);
 261
 262         val->valdat_len = c->ypc_val.valdat_len;
 263         val->valdat_val = c->ypc_val.valdat_val;
 264
 265         return(TRUE);
 266 }
 267 #endif
 268
 269 const char *
 270 ypbinderr_string(int incode)
 271 {
 272         static char err[80];
 273         switch (incode) {
 274         case 0:
 275                 return ("Success");
 276         case YPBIND_ERR_ERR:
 277                 return ("Internal ypbind error");
 278         case YPBIND_ERR_NOSERV:
 279                 return ("Domain not bound");
 280         case YPBIND_ERR_RESC:
 281                 return ("System resource allocation failure");
 282         }
 283         sprintf(err, "Unknown ypbind error: #%d\n", incode);
 284         return (err);
 285 }
 286
 287 int
 288 _yp_dobind(char *dom, struct dom_binding **ypdb)
 289 {
 290         static pid_t pid = -1;
 291         char path[MAXPATHLEN];
 292         struct dom_binding *ysd, *ysd2;
 293         struct ypbind_resp ypbr;
 294         struct timeval tv;
 295         struct sockaddr_in clnt_sin;
 296         int clnt_sock, fd;
 297         pid_t gpid;
 298         CLIENT *client;
 299         int new = 0, r;
 300         int retries = 0;
 301         struct sockaddr_in check;
 302         socklen_t checklen = sizeof(struct sockaddr_in);
 303
 304         /* Not allowed; bad doggie. Bad. */
 305         if (strchr(dom, '/') != NULL)
 306                 return(YPERR_BADARGS);
 307
 308         gpid = getpid();
 309         if (!(pid == -1 || pid == gpid)) {
 310                 ysd = _ypbindlist;
 311                 while (ysd) {
 312                         if (ysd->dom_client != NULL)
 313                                 _yp_unbind(ysd);
 314                         ysd2 = ysd->dom_pnext;
 315                         free(ysd);
 316                         ysd = ysd2;
 317                 }
 318                 _ypbindlist = NULL;
 319         }
 320         pid = gpid;
 321
 322         if (ypdb != NULL)
 323                 *ypdb = NULL;
 324
 325         if (dom == NULL || strlen(dom) == 0)
 326                 return (YPERR_BADARGS);
 327
 328         for (ysd = _ypbindlist; ysd; ysd = ysd->dom_pnext)
 329                 if (strcmp(dom, ysd->dom_domain) == 0)
 330                         break;
 331
 332
 333         if (ysd == NULL) {
 334                 ysd = (struct dom_binding *)malloc(sizeof *ysd);
 335                 if (ysd == NULL)
 336                         return (YPERR_RESRC);
 337                 bzero((char *)ysd, sizeof *ysd);
 338                 ysd->dom_socket = -1;
 339                 ysd->dom_vers = 0;
 340                 new = 1;
 341         } else {
 342         /* Check the socket -- may have been hosed by the caller. */
 343                 if (_getsockname(ysd->dom_socket, (struct sockaddr *)&check,
 344                     &checklen) == -1 || check.sin_family != AF_INET ||
 345                     check.sin_port != ysd->dom_local_port) {
 346                 /* Socket became bogus somehow... need to rebind. */
 347                         int save, sock;
 348
 349                         sock = ysd->dom_socket;
 350                         save = _dup(ysd->dom_socket);
 351                         if (ysd->dom_client != NULL)
 352                                 clnt_destroy(ysd->dom_client);
 353                         ysd->dom_vers = 0;
 354                         ysd->dom_client = NULL;
 355                         sock = _dup2(save, sock);
 356                         _close(save);
 357                 }
 358         }
 359
 360 again:
 361         retries++;
 362         if (retries > MAX_RETRIES) {
 363                 if (new)
 364                         free(ysd);
 365                 return(YPERR_YPBIND);
 366         }
 367 #ifdef BINDINGDIR
 368         if (ysd->dom_vers == 0) {
 369                 /*
 370                  * We're trying to make a new binding: zorch the
 371                  * existing handle now (if any).
 372                  */
 373                 if (ysd->dom_client != NULL) {
 374                         clnt_destroy(ysd->dom_client);
 375                         ysd->dom_client = NULL;
 376                         ysd->dom_socket = -1;
 377                 }
 378                 snprintf(path, sizeof(path), "%s/%s.%d", BINDINGDIR, dom, 2);
 379                 if ((fd = _open(path, O_RDONLY | O_CLOEXEC)) == -1) {
 380                         /* no binding file, YP is dead. */
 381                         /* Try to bring it back to life. */
 382                         _close(fd);
 383                         goto skipit;
 384                 }
 385                 if (_flock(fd, LOCK_EX|LOCK_NB) == -1 && errno == EWOULDBLOCK) {
 386                         struct iovec iov[2];
 387                         struct ypbind_resp ybr;
 388                         u_short ypb_port;
 389
 390                         iov[0].iov_base = (caddr_t)&ypb_port;
 391                         iov[0].iov_len = sizeof ypb_port;
 392                         iov[1].iov_base = (caddr_t)&ybr;
 393                         iov[1].iov_len = sizeof ybr;
 394
 395                         r = _readv(fd, iov, 2);
 396                         if (r != iov[0].iov_len + iov[1].iov_len) {
 397                                 _close(fd);
 398                                 ysd->dom_vers = -1;
 399                                 goto again;
 400                         }
 401
 402                         bzero(&ysd->dom_server_addr, sizeof ysd->dom_server_addr);
 403                         ysd->dom_server_addr.sin_family = AF_INET;
 404                         ysd->dom_server_addr.sin_len = sizeof(struct sockaddr_in);
 405                         bcopy(&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr,
 406                             &ysd->dom_server_addr.sin_addr.s_addr,
 407                             sizeof(ysd->dom_server_addr.sin_addr.s_addr));
 408                         bcopy(&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port,
 409                             &ysd->dom_server_addr.sin_port,
 410                             sizeof(ysd->dom_server_addr.sin_port));
 411
 412                         ysd->dom_server_port = ysd->dom_server_addr.sin_port;
 413                         _close(fd);
 414                         goto gotit;
 415                 } else {
 416                         /* no lock on binding file, YP is dead. */
 417                         /* Try to bring it back to life. */
 418                         _close(fd);
 419                         goto skipit;
 420                 }
 421         }
 422 skipit:
 423 #endif
 424         if (ysd->dom_vers == -1 || ysd->dom_vers == 0) {
 425                 /*
 426                  * We're trying to make a new binding: zorch the
 427                  * existing handle now (if any).
 428                  */
 429                 if (ysd->dom_client != NULL) {
 430                         clnt_destroy(ysd->dom_client);
 431                         ysd->dom_client = NULL;
 432                         ysd->dom_socket = -1;
 433                 }
 434                 bzero((char *)&clnt_sin, sizeof clnt_sin);
 435                 clnt_sin.sin_family = AF_INET;
 436                 clnt_sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 437
 438                 clnt_sock = RPC_ANYSOCK;
 439                 client = clnttcp_create(&clnt_sin, YPBINDPROG, YPBINDVERS, &clnt_sock,
 440                         0, 0);
 441                 if (client == NULL) {
 442                         /*
 443                          * These conditions indicate ypbind just isn't
 444                          * alive -- we probably don't want to shoot our
 445                          * mouth off in this case; instead generate error
 446                          * messages only for really exotic problems.
 447                          */
 448                         if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED &&
 449                            (rpc_createerr.cf_stat != RPC_SYSTEMERROR &&
 450                            rpc_createerr.cf_error.re_errno == ECONNREFUSED))
 451                                 clnt_pcreateerror("clnttcp_create");
 452                         if (new)
 453                                 free(ysd);
 454                         return (YPERR_YPBIND);
 455                 }
 456
 457                 /*
 458                  * Check the port number -- should be < IPPORT_RESERVED.
 459                  * If not, it's possible someone has registered a bogus
 460                  * ypbind with the portmapper and is trying to trick us.
 461                  */
 462                 if (ntohs(clnt_sin.sin_port) >= IPPORT_RESERVED) {
 463                         if (client != NULL)
 464                                 clnt_destroy(client);
 465                         if (new)
 466                                 free(ysd);
 467                         return(YPERR_YPBIND);
 468                 }
 469                 tv.tv_sec = _yplib_timeout/2;
 470                 tv.tv_usec = 0;
 471                 r = clnt_call(client, YPBINDPROC_DOMAIN,
 472                         (xdrproc_t)xdr_domainname, &dom,
 473                         (xdrproc_t)xdr_ypbind_resp, &ypbr, tv);
 474                 if (r != RPC_SUCCESS) {
 475                         clnt_destroy(client);
 476                         ysd->dom_vers = -1;
 477                         if (r == RPC_PROGUNAVAIL || r == RPC_PROCUNAVAIL) {
 478                                 if (new)
 479                                         free(ysd);
 480                                 return(YPERR_YPBIND);
 481                         }
 482                         fprintf(stderr,
 483                         "YP: server for domain %s not responding, retrying\n", dom);
 484                         goto again;
 485                 } else {
 486                         if (ypbr.ypbind_status != YPBIND_SUCC_VAL) {
 487                                 struct timespec time_to_sleep, time_remaining;
 488
 489                                 clnt_destroy(client);
 490                                 ysd->dom_vers = -1;
 491
 492                                 time_to_sleep.tv_sec = _yplib_timeout/2;
 493                                 time_to_sleep.tv_nsec = 0;
 494                                 _nanosleep(&time_to_sleep,
 495                                     &time_remaining);
 496                                 goto again;
 497                         }
 498                 }
 499                 clnt_destroy(client);
 500
 501                 bzero((char *)&ysd->dom_server_addr, sizeof ysd->dom_server_addr);
 502                 ysd->dom_server_addr.sin_family = AF_INET;
 503                 bcopy(&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port,
 504                     &ysd->dom_server_addr.sin_port,
 505                     sizeof(ysd->dom_server_addr.sin_port));
 506                 bcopy(&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr,
 507                     &ysd->dom_server_addr.sin_addr.s_addr,
 508                     sizeof(ysd->dom_server_addr.sin_addr.s_addr));
 509
 510                 /*
 511                  * We could do a reserved port check here too, but this
 512                  * could pose compatibility problems. The local ypbind is
 513                  * supposed to decide whether or not to trust yp servers
 514                  * on insecure ports. For now, we trust its judgement.
 515                  */
 516                 ysd->dom_server_port =
 517                         *(u_short *)&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port;
 518 gotit:
 519                 ysd->dom_vers = YPVERS;
 520                 strlcpy(ysd->dom_domain, dom, sizeof(ysd->dom_domain));
 521         }
 522
 523         /* Don't rebuild the connection to the server unless we have to. */
 524         if (ysd->dom_client == NULL) {
 525                 tv.tv_sec = _yplib_timeout/2;
 526                 tv.tv_usec = 0;
 527                 ysd->dom_socket = RPC_ANYSOCK;
 528                 ysd->dom_client = clntudp_bufcreate(&ysd->dom_server_addr,
 529                         YPPROG, YPVERS, tv, &ysd->dom_socket, 1280, 2304);
 530                 if (ysd->dom_client == NULL) {
 531                         clnt_pcreateerror("clntudp_create");
 532                         ysd->dom_vers = -1;
 533                         goto again;
 534                 }
 535                 if (_fcntl(ysd->dom_socket, F_SETFD, 1) == -1)
 536                         perror("fcntl: F_SETFD");
 537                 /*
 538                  * We want a port number associated with this socket
 539                  * so that we can check its authenticity later.
 540                  */
 541                 checklen = sizeof(struct sockaddr_in);
 542                 bzero((char *)&check, checklen);
 543                 _bind(ysd->dom_socket, (struct sockaddr *)&check, checklen);
 544                 check.sin_family = AF_INET;
 545                 if (!_getsockname(ysd->dom_socket,
 546                     (struct sockaddr *)&check, &checklen)) {
 547                         ysd->dom_local_port = check.sin_port;
 548                 } else {
 549                         clnt_destroy(ysd->dom_client);
 550                         if (new)
 551                                 free(ysd);
 552                         return(YPERR_YPBIND);
 553                 }
 554         }
 555
 556         if (new) {
 557                 ysd->dom_pnext = _ypbindlist;
 558                 _ypbindlist = ysd;
 559         }
 560
 561         /*
 562          * Set low retry timeout to realistically handle UDP packet
 563          * loss for YP packet bursts.
 564          */
 565         tv.tv_sec = 1;
 566         tv.tv_usec = 0;
 567         clnt_control(ysd->dom_client, CLSET_RETRY_TIMEOUT, (char*)&tv);
 568
 569         if (ypdb != NULL)
 570                 *ypdb = ysd;
 571         return (0);
 572 }
 573
 574 static void
 575 _yp_unbind(struct dom_binding *ypb)
 576 {
 577         struct sockaddr_in check;
 578         socklen_t checklen = sizeof(struct sockaddr_in);
 579
 580         if (ypb->dom_client != NULL) {
 581                 /* Check the socket -- may have been hosed by the caller. */
 582                 if (_getsockname(ypb->dom_socket, (struct sockaddr *)&check,
 583                 &checklen) == -1 || check.sin_family != AF_INET ||
 584                 check.sin_port != ypb->dom_local_port) {
 585                         int save, sock;
 586
 587                         sock = ypb->dom_socket;
 588                         save = _dup(ypb->dom_socket);
 589                         clnt_destroy(ypb->dom_client);
 590                         sock = _dup2(save, sock);
 591                         _close(save);
 592                 } else
 593                         clnt_destroy(ypb->dom_client);
 594         }
 595
 596         ypb->dom_client = NULL;
 597         ypb->dom_socket = -1;
 598         ypb->dom_vers = -1;
 599 #ifdef YPMATCHCACHE
 600         ypmatch_cache_flush(ypb);
 601 #endif
 602 }
 603
 604 static int
 605 yp_bind_locked(char *dom)
 606 {
 607         return (_yp_dobind(dom, NULL));
 608 }
 609
 610 int
 611 yp_bind(char *dom)
 612 {
 613         int r;
 614
 615         YPLOCK();
 616         r = yp_bind_locked(dom);
 617         YPUNLOCK();
 618         return (r);
 619 }
 620
 621 static void
 622 yp_unbind_locked(char *dom)
 623 {
 624         struct dom_binding *ypb, *ypbp;
 625
 626         ypbp = NULL;
 627         for (ypb = _ypbindlist; ypb; ypb = ypb->dom_pnext) {
 628                 if (strcmp(dom, ypb->dom_domain) == 0) {
 629                         _yp_unbind(ypb);
 630                         if (ypbp)
 631                                 ypbp->dom_pnext = ypb->dom_pnext;
 632                         else
 633                                 _ypbindlist = ypb->dom_pnext;
 634                         free(ypb);
 635                         return;
 636                 }
 637                 ypbp = ypb;
 638         }
 639         return;
 640 }
 641
 642 void
 643 yp_unbind(char *dom)
 644 {
 645         YPLOCK();
 646         yp_unbind_locked(dom);
 647         YPUNLOCK();
 648 }
 649
 650 int
 651 yp_match(char *indomain, char *inmap, const char *inkey, int inkeylen,
 652     char **outval, int *outvallen)
 653 {
 654         struct dom_binding *ysd;
 655         struct ypresp_val yprv;
 656         struct timeval tv;
 657         struct ypreq_key yprk;
 658         int r;
 659         int retries = 0;
 660         *outval = NULL;
 661         *outvallen = 0;
 662
 663         /* Sanity check */
 664
 665         if (inkey == NULL || !strlen(inkey) || inkeylen <= 0 ||
 666             inmap == NULL || !strlen(inmap) ||
 667             indomain == NULL || !strlen(indomain))
 668                 return (YPERR_BADARGS);
 669
 670         YPLOCK();
 671         if (_yp_dobind(indomain, &ysd) != 0) {
 672                 YPUNLOCK();
 673                 return(YPERR_DOMAIN);
 674         }
 675
 676         yprk.domain = indomain;
 677         yprk.map = inmap;
 678         yprk.key.keydat_val = (char *)inkey;
 679         yprk.key.keydat_len = inkeylen;
 680
 681 #ifdef YPMATCHCACHE
 682         if (ypmatch_cache_lookup(ysd, yprk.map, &yprk.key, &yprv.val) == TRUE) {
 683 /*
 684         if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
 685             inkeylen, &yprv.val.valdat_val, &yprv.val.valdat_len)) {
 686 */
 687                 *outvallen = yprv.val.valdat_len;
 688                 *outval = (char *)malloc(*outvallen+1);
 689                 if (*outval == NULL) {
 690                         _yp_unbind(ysd);
 691                         *outvallen = 0;
 692                         YPUNLOCK();
 693                         return (YPERR_RESRC);
 694                 }
 695                 bcopy(yprv.val.valdat_val, *outval, *outvallen);
 696                 (*outval)[*outvallen] = '\0';
 697                 YPUNLOCK();
 698                 return (0);
 699         }
 700         _yp_unbind(ysd);
 701 #endif
 702
 703 again:
 704         if (retries > MAX_RETRIES) {
 705                 YPUNLOCK();
 706                 return (YPERR_RPC);
 707         }
 708
 709         if (_yp_dobind(indomain, &ysd) != 0) {
 710                 YPUNLOCK();
 711                 return (YPERR_DOMAIN);
 712         }
 713
 714         tv.tv_sec = _yplib_timeout;
 715         tv.tv_usec = 0;
 716
 717         bzero((char *)&yprv, sizeof yprv);
 718
 719         r = clnt_call(ysd->dom_client, YPPROC_MATCH,
 720                 (xdrproc_t)xdr_ypreq_key, &yprk,
 721                 (xdrproc_t)xdr_ypresp_val, &yprv, tv);
 722         if (r != RPC_SUCCESS) {
 723                 clnt_perror(ysd->dom_client, "yp_match: clnt_call");
 724                 _yp_unbind(ysd);
 725                 retries++;
 726                 goto again;
 727         }
 728
 729         if (!(r = ypprot_err(yprv.stat))) {
 730                 *outvallen = yprv.val.valdat_len;
 731                 *outval = (char *)malloc(*outvallen+1);
 732                 if (*outval == NULL) {
 733                         _yp_unbind(ysd);
 734                         *outvallen = 0;
 735                         xdr_free((xdrproc_t)xdr_ypresp_val, &yprv);
 736                         YPUNLOCK();
 737                         return (YPERR_RESRC);
 738                 }
 739                 bcopy(yprv.val.valdat_val, *outval, *outvallen);
 740                 (*outval)[*outvallen] = '\0';
 741 #ifdef YPMATCHCACHE
 742                 ypmatch_cache_insert(ysd, yprk.map, &yprk.key, &yprv.val);
 743 #endif
 744         }
 745
 746         xdr_free((xdrproc_t)xdr_ypresp_val, &yprv);
 747         YPUNLOCK();
 748         return (r);
 749 }
 750
 751 static int
 752 yp_get_default_domain_locked(char **domp)
 753 {
 754         *domp = NULL;
 755         if (_yp_domain[0] == '\0')
 756                 if (getdomainname(_yp_domain, sizeof _yp_domain))
 757                         return (YPERR_NODOM);
 758         *domp = _yp_domain;
 759         return (0);
 760 }
 761
 762 int
 763 yp_get_default_domain(char **domp)
 764 {
 765         int r;
 766
 767         YPLOCK();
 768         r = yp_get_default_domain_locked(domp);
 769         YPUNLOCK();
 770         return (r);
 771 }
 772
 773 int
 774 yp_first(char *indomain, char *inmap, char **outkey, int *outkeylen,
 775     char **outval, int *outvallen)
 776 {
 777         struct ypresp_key_val yprkv;
 778         struct ypreq_nokey yprnk;
 779         struct dom_binding *ysd;
 780         struct timeval tv;
 781         int r;
 782         int retries = 0;
 783         /* Sanity check */
 784
 785         if (indomain == NULL || !strlen(indomain) ||
 786             inmap == NULL || !strlen(inmap))
 787                 return (YPERR_BADARGS);
 788
 789         *outkey = *outval = NULL;
 790         *outkeylen = *outvallen = 0;
 791
 792         YPLOCK();
 793 again:
 794         if (retries > MAX_RETRIES) {
 795                 YPUNLOCK();
 796                 return (YPERR_RPC);
 797         }
 798
 799         if (_yp_dobind(indomain, &ysd) != 0) {
 800                 YPUNLOCK();
 801                 return (YPERR_DOMAIN);
 802         }
 803
 804         tv.tv_sec = _yplib_timeout;
 805         tv.tv_usec = 0;
 806
 807         yprnk.domain = indomain;
 808         yprnk.map = inmap;
 809         bzero((char *)&yprkv, sizeof yprkv);
 810
 811         r = clnt_call(ysd->dom_client, YPPROC_FIRST,
 812                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 813                 (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
 814         if (r != RPC_SUCCESS) {
 815                 clnt_perror(ysd->dom_client, "yp_first: clnt_call");
 816                 _yp_unbind(ysd);
 817                 retries++;
 818                 goto again;
 819         }
 820         if (!(r = ypprot_err(yprkv.stat))) {
 821                 *outkeylen = yprkv.key.keydat_len;
 822                 *outkey = (char *)malloc(*outkeylen+1);
 823                 if (*outkey == NULL) {
 824                         _yp_unbind(ysd);
 825                         *outkeylen = 0;
 826                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 827                         YPUNLOCK();
 828                         return (YPERR_RESRC);
 829                 }
 830                 bcopy(yprkv.key.keydat_val, *outkey, *outkeylen);
 831                 (*outkey)[*outkeylen] = '\0';
 832                 *outvallen = yprkv.val.valdat_len;
 833                 *outval = (char *)malloc(*outvallen+1);
 834                 if (*outval == NULL) {
 835                         free(*outkey);
 836                         _yp_unbind(ysd);
 837                         *outkeylen = *outvallen = 0;
 838                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 839                         YPUNLOCK();
 840                         return (YPERR_RESRC);
 841                 }
 842                 bcopy(yprkv.val.valdat_val, *outval, *outvallen);
 843                 (*outval)[*outvallen] = '\0';
 844         }
 845
 846         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 847         YPUNLOCK();
 848         return (r);
 849 }
 850
 851 int
 852 yp_next(char *indomain, char *inmap, char *inkey, int inkeylen,
 853     char **outkey, int *outkeylen, char **outval, int *outvallen)
 854 {
 855         struct ypresp_key_val yprkv;
 856         struct ypreq_key yprk;
 857         struct dom_binding *ysd;
 858         struct timeval tv;
 859         int r;
 860         int retries = 0;
 861         /* Sanity check */
 862
 863         if (inkey == NULL || !strlen(inkey) || inkeylen <= 0 ||
 864             inmap == NULL || !strlen(inmap) ||
 865             indomain == NULL || !strlen(indomain))
 866                 return (YPERR_BADARGS);
 867
 868         *outkey = *outval = NULL;
 869         *outkeylen = *outvallen = 0;
 870
 871         YPLOCK();
 872 again:
 873         if (retries > MAX_RETRIES) {
 874                 YPUNLOCK();
 875                 return (YPERR_RPC);
 876         }
 877
 878         if (_yp_dobind(indomain, &ysd) != 0) {
 879                 YPUNLOCK();
 880                 return (YPERR_DOMAIN);
 881         }
 882
 883         tv.tv_sec = _yplib_timeout;
 884         tv.tv_usec = 0;
 885
 886         yprk.domain = indomain;
 887         yprk.map = inmap;
 888         yprk.key.keydat_val = inkey;
 889         yprk.key.keydat_len = inkeylen;
 890         bzero((char *)&yprkv, sizeof yprkv);
 891
 892         r = clnt_call(ysd->dom_client, YPPROC_NEXT,
 893                 (xdrproc_t)xdr_ypreq_key, &yprk,
 894                 (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
 895         if (r != RPC_SUCCESS) {
 896                 clnt_perror(ysd->dom_client, "yp_next: clnt_call");
 897                 _yp_unbind(ysd);
 898                 retries++;
 899                 goto again;
 900         }
 901         if (!(r = ypprot_err(yprkv.stat))) {
 902                 *outkeylen = yprkv.key.keydat_len;
 903                 *outkey = (char *)malloc(*outkeylen+1);
 904                 if (*outkey == NULL) {
 905                         _yp_unbind(ysd);
 906                         *outkeylen = 0;
 907                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 908                         YPUNLOCK();
 909                         return (YPERR_RESRC);
 910                 }
 911                 bcopy(yprkv.key.keydat_val, *outkey, *outkeylen);
 912                 (*outkey)[*outkeylen] = '\0';
 913                 *outvallen = yprkv.val.valdat_len;
 914                 *outval = (char *)malloc(*outvallen+1);
 915                 if (*outval == NULL) {
 916                         free(*outkey);
 917                         _yp_unbind(ysd);
 918                         *outkeylen = *outvallen = 0;
 919                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 920                         YPUNLOCK();
 921                         return (YPERR_RESRC);
 922                 }
 923                 bcopy(yprkv.val.valdat_val, *outval, *outvallen);
 924                 (*outval)[*outvallen] = '\0';
 925         }
 926
 927         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 928         YPUNLOCK();
 929         return (r);
 930 }
 931
 932 int
 933 yp_all(char *indomain, char *inmap, struct ypall_callback *incallback)
 934 {
 935         struct ypreq_nokey yprnk;
 936         struct dom_binding *ysd;
 937         struct timeval tv;
 938         struct sockaddr_in clnt_sin;
 939         CLIENT *clnt;
 940         u_long status, savstat;
 941         int clnt_sock;
 942         int retries = 0;
 943         /* Sanity check */
 944
 945         if (indomain == NULL || !strlen(indomain) ||
 946             inmap == NULL || !strlen(inmap))
 947                 return (YPERR_BADARGS);
 948
 949         YPLOCK();
 950 again:
 951         if (retries > MAX_RETRIES) {
 952                 YPUNLOCK();
 953                 return (YPERR_RPC);
 954         }
 955
 956         if (_yp_dobind(indomain, &ysd) != 0) {
 957                 YPUNLOCK();
 958                 return (YPERR_DOMAIN);
 959         }
 960
 961         tv.tv_sec = _yplib_timeout;
 962         tv.tv_usec = 0;
 963
 964         /* YPPROC_ALL manufactures its own channel to ypserv using TCP */
 965
 966         clnt_sock = RPC_ANYSOCK;
 967         clnt_sin = ysd->dom_server_addr;
 968         clnt_sin.sin_port = 0;
 969         clnt = clnttcp_create(&clnt_sin, YPPROG, YPVERS, &clnt_sock, 0, 0);
 970         if (clnt == NULL) {
 971                 YPUNLOCK();
 972                 printf("clnttcp_create failed\n");
 973                 return (YPERR_PMAP);
 974         }
 975
 976         yprnk.domain = indomain;
 977         yprnk.map = inmap;
 978         ypresp_allfn = incallback->foreach;
 979         ypresp_data = (void *)incallback->data;
 980
 981         if (clnt_call(clnt, YPPROC_ALL,
 982                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 983                 (xdrproc_t)xdr_ypresp_all_seq, &status, tv) != RPC_SUCCESS) {
 984                         clnt_perror(clnt, "yp_all: clnt_call");
 985                         clnt_destroy(clnt);
 986                         _yp_unbind(ysd);
 987                         retries++;
 988                         goto again;
 989         }
 990
 991         clnt_destroy(clnt);
 992         savstat = status;
 993         xdr_free((xdrproc_t)xdr_ypresp_all_seq, &status);       /* not really needed... */
 994         YPUNLOCK();
 995         if (savstat != YP_NOMORE)
 996                 return (ypprot_err(savstat));
 997         return (0);
 998 }
 999
1000 int
1001 yp_order(char *indomain, char *inmap, int *outorder)
1002 {
1003         struct dom_binding *ysd;
1004         struct ypresp_order ypro;
1005         struct ypreq_nokey yprnk;
1006         struct timeval tv;
1007         int r;
1008
1009         /* Sanity check */
1010
1011         if (indomain == NULL || !strlen(indomain) ||
1012             inmap == NULL || !strlen(inmap))
1013                 return (YPERR_BADARGS);
1014
1015         YPLOCK();
1016 again:
1017         if (_yp_dobind(indomain, &ysd) != 0) {
1018                 YPUNLOCK();
1019                 return (YPERR_DOMAIN);
1020         }
1021
1022         tv.tv_sec = _yplib_timeout;
1023         tv.tv_usec = 0;
1024
1025         yprnk.domain = indomain;
1026         yprnk.map = inmap;
1027
1028         bzero((char *)(char *)&ypro, sizeof ypro);
1029
1030         r = clnt_call(ysd->dom_client, YPPROC_ORDER,
1031                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
1032                 (xdrproc_t)xdr_ypresp_order, &ypro, tv);
1033
1034         /*
1035          * NIS+ in YP compat mode doesn't support the YPPROC_ORDER
1036          * procedure.
1037          */
1038         if (r == RPC_PROCUNAVAIL) {
1039                 YPUNLOCK();
1040                 return(YPERR_YPERR);
1041         }
1042
1043         if (r != RPC_SUCCESS) {
1044                 clnt_perror(ysd->dom_client, "yp_order: clnt_call");
1045                 _yp_unbind(ysd);
1046                 goto again;
1047         }
1048
1049         if (!(r = ypprot_err(ypro.stat))) {
1050                 *outorder = ypro.ordernum;
1051         }
1052
1053         xdr_free((xdrproc_t)xdr_ypresp_order, &ypro);
1054         YPUNLOCK();
1055         return (r);
1056 }
1057
1058 int
1059 yp_master(char *indomain, char *inmap, char **outname)
1060 {
1061         struct dom_binding *ysd;
1062         struct ypresp_master yprm;
1063         struct ypreq_nokey yprnk;
1064         struct timeval tv;
1065         int r;
1066
1067         /* Sanity check */
1068
1069         if (indomain == NULL || !strlen(indomain) ||
1070             inmap == NULL || !strlen(inmap))
1071                 return (YPERR_BADARGS);
1072         YPLOCK();
1073 again:
1074         if (_yp_dobind(indomain, &ysd) != 0) {
1075                 YPUNLOCK();
1076                 return (YPERR_DOMAIN);
1077         }
1078
1079         tv.tv_sec = _yplib_timeout;
1080         tv.tv_usec = 0;
1081
1082         yprnk.domain = indomain;
1083         yprnk.map = inmap;
1084
1085         bzero((char *)&yprm, sizeof yprm);
1086
1087         r = clnt_call(ysd->dom_client, YPPROC_MASTER,
1088                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
1089                 (xdrproc_t)xdr_ypresp_master, &yprm, tv);
1090         if (r != RPC_SUCCESS) {
1091                 clnt_perror(ysd->dom_client, "yp_master: clnt_call");
1092                 _yp_unbind(ysd);
1093                 goto again;
1094         }
1095
1096         if (!(r = ypprot_err(yprm.stat))) {
1097                 *outname = (char *)strdup(yprm.peer);
1098         }
1099
1100         xdr_free((xdrproc_t)xdr_ypresp_master, &yprm);
1101         YPUNLOCK();
1102         return (r);
1103 }
1104
1105 int
1106 yp_maplist(char *indomain, struct ypmaplist **outmaplist)
1107 {
1108         struct dom_binding *ysd;
1109         struct ypresp_maplist ypml;
1110         struct timeval tv;
1111         int r;
1112
1113         /* Sanity check */
1114
1115         if (indomain == NULL || !strlen(indomain))
1116                 return (YPERR_BADARGS);
1117
1118         YPLOCK();
1119 again:
1120         if (_yp_dobind(indomain, &ysd) != 0) {
1121                 YPUNLOCK();
1122                 return (YPERR_DOMAIN);
1123         }
1124
1125         tv.tv_sec = _yplib_timeout;
1126         tv.tv_usec = 0;
1127
1128         bzero((char *)&ypml, sizeof ypml);
1129
1130         r = clnt_call(ysd->dom_client, YPPROC_MAPLIST,
1131                 (xdrproc_t)xdr_domainname, &indomain,
1132                 (xdrproc_t)xdr_ypresp_maplist, &ypml,tv);
1133         if (r != RPC_SUCCESS) {
1134                 clnt_perror(ysd->dom_client, "yp_maplist: clnt_call");
1135                 _yp_unbind(ysd);
1136                 goto again;
1137         }
1138         if (!(r = ypprot_err(ypml.stat))) {
1139                 *outmaplist = ypml.maps;
1140         }
1141
1142         /* NO: xdr_free((xdrproc_t)xdr_ypresp_maplist, &ypml);*/
1143         YPUNLOCK();
1144         return (r);
1145 }
1146
1147 const char *
1148 yperr_string(int incode)
1149 {
1150         static char err[80];
1151
1152         switch (incode) {
1153         case 0:
1154                 return ("Success");
1155         case YPERR_BADARGS:
1156                 return ("Request arguments bad");
1157         case YPERR_RPC:
1158                 return ("RPC failure");
1159         case YPERR_DOMAIN:
1160                 return ("Can't bind to server which serves this domain");
1161         case YPERR_MAP:
1162                 return ("No such map in server's domain");
1163         case YPERR_KEY:
1164                 return ("No such key in map");
1165         case YPERR_YPERR:
1166                 return ("YP server error");
1167         case YPERR_RESRC:
1168                 return ("Local resource allocation failure");
1169         case YPERR_NOMORE:
1170                 return ("No more records in map database");
1171         case YPERR_PMAP:
1172                 return ("Can't communicate with portmapper");
1173         case YPERR_YPBIND:
1174                 return ("Can't communicate with ypbind");
1175         case YPERR_YPSERV:
1176                 return ("Can't communicate with ypserv");
1177         case YPERR_NODOM:
1178                 return ("Local domain name not set");
1179         case YPERR_BADDB:
1180                 return ("Server data base is bad");
1181         case YPERR_VERS:
1182                 return ("YP server version mismatch - server can't supply service.");
1183         case YPERR_ACCESS:
1184                 return ("Access violation");
1185         case YPERR_BUSY:
1186                 return ("Database is busy");
1187         }
1188         sprintf(err, "YP unknown error %d\n", incode);
1189         return (err);
1190 }
1191
1192 int
1193 ypprot_err(unsigned int incode)
1194 {
1195         switch (incode) {
1196         case YP_TRUE:
1197                 return (0);
1198         case YP_FALSE:
1199                 return (YPERR_YPBIND);
1200         case YP_NOMORE:
1201                 return (YPERR_NOMORE);
1202         case YP_NOMAP:
1203                 return (YPERR_MAP);
1204         case YP_NODOM:
1205                 return (YPERR_DOMAIN);
1206         case YP_NOKEY:
1207                 return (YPERR_KEY);
1208         case YP_BADOP:
1209                 return (YPERR_YPERR);
1210         case YP_BADDB:
1211                 return (YPERR_BADDB);
1212         case YP_YPERR:
1213                 return (YPERR_YPERR);
1214         case YP_BADARGS:
1215                 return (YPERR_BADARGS);
1216         case YP_VERS:
1217                 return (YPERR_VERS);
1218         }
1219         return (YPERR_YPERR);
1220 }
1221
1222 int
1223 _yp_check(char **dom)
1224 {
1225         char *unused;
1226
1227         YPLOCK();
1228         if (_yp_domain[0]=='\0')
1229                 if (yp_get_default_domain_locked(&unused)) {
1230                         YPUNLOCK();
1231                         return (0);
1232                 }
1233
1234         if (dom)
1235                 *dom = _yp_domain;
1236
1237         if (yp_bind_locked(_yp_domain) == 0) {
1238                 yp_unbind_locked(_yp_domain);
1239                 YPUNLOCK();
1240                 return (1);
1241         }
1242         YPUNLOCK();
1243         return (0);
1244 }