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 #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 bool_t xdr_ypresp_all_seq(XDR *xdrs, u_long *objp);
  94
  95 int (*ypresp_allfn)();
  96 void *ypresp_data;
  97
  98 static void _yp_unbind(struct dom_binding *);
  99 struct dom_binding *_ypbindlist;
 100 static char _yp_domain[MAXHOSTNAMELEN];
 101 int _yplib_timeout = 20;
 102
 103 static mutex_t _ypmutex = MUTEX_INITIALIZER;
 104 #define YPLOCK()        mutex_lock(&_ypmutex);
 105 #define YPUNLOCK()      mutex_unlock(&_ypmutex);
 106
 107 #ifdef YPMATCHCACHE
 108 static void
 109 ypmatch_cache_delete(struct dom_binding *ypdb, struct ypmatch_ent *prev,
 110     struct ypmatch_ent *cur)
 111 {
 112         if (prev == NULL)
 113                 ypdb->cache = cur->ypc_next;
 114         else
 115                 prev->ypc_next = cur->ypc_next;
 116
 117         free(cur->ypc_map);
 118         free(cur->ypc_key.keydat_val);
 119         free(cur->ypc_val.valdat_val);
 120         free(cur);
 121
 122         ypdb->ypmatch_cachecnt--;
 123
 124         return;
 125 }
 126
 127 static void
 128 ypmatch_cache_flush(struct dom_binding *ypdb)
 129 {
 130         struct ypmatch_ent      *n, *c = ypdb->cache;
 131
 132         while (c != NULL) {
 133                 n = c->ypc_next;
 134                 ypmatch_cache_delete(ypdb, NULL, c);
 135                 c = n;
 136         }
 137
 138         return;
 139 }
 140
 141 static void
 142 ypmatch_cache_expire(struct dom_binding *ypdb)
 143 {
 144         struct ypmatch_ent      *c = ypdb->cache;
 145         struct ypmatch_ent      *n, *p = NULL;
 146         time_t                  t;
 147
 148         time(&t);
 149
 150         while (c != NULL) {
 151                 if (t >= c->ypc_expire_t) {
 152                         n = c->ypc_next;
 153                         ypmatch_cache_delete(ypdb, p, c);
 154                         c = n;
 155                 } else {
 156                         p = c;
 157                         c = c->ypc_next;
 158                 }
 159         }
 160
 161         return;
 162 }
 163
 164 static void
 165 ypmatch_cache_insert(struct dom_binding *ypdb, char *map, keydat *key,
 166     valdat *val)
 167 {
 168         struct ypmatch_ent      *new;
 169
 170         /* Do an expire run to maybe open up a slot. */
 171         if (ypdb->ypmatch_cachecnt)
 172                 ypmatch_cache_expire(ypdb);
 173
 174         /*
 175          * If there are no slots free, then force an expire of
 176          * the least recently used entry.
 177          */
 178         if (ypdb->ypmatch_cachecnt >= YPLIB_MAXCACHE) {
 179                 struct ypmatch_ent      *o = NULL, *c = ypdb->cache;
 180                 time_t                  oldest = 0;
 181
 182                 oldest = ~oldest;
 183
 184                 while (c != NULL) {
 185                         if (c->ypc_expire_t < oldest) {
 186                                 oldest = c->ypc_expire_t;
 187                                 o = c;
 188                         }
 189                         c = c->ypc_next;
 190                 }
 191
 192                 if (o == NULL)
 193                         return;
 194                 o->ypc_expire_t = 0;
 195                 ypmatch_cache_expire(ypdb);
 196         }
 197
 198         new = malloc(sizeof(struct ypmatch_ent));
 199         if (new == NULL)
 200                 return;
 201
 202         new->ypc_map = strdup(map);
 203         if (new->ypc_map == NULL) {
 204                 free(new);
 205                 return;
 206         }
 207         new->ypc_key.keydat_val = malloc(key->keydat_len);
 208         if (new->ypc_key.keydat_val == NULL) {
 209                 free(new->ypc_map);
 210                 free(new);
 211                 return;
 212         }
 213         new->ypc_val.valdat_val = malloc(val->valdat_len);
 214         if (new->ypc_val.valdat_val == NULL) {
 215                 free(new->ypc_val.valdat_val);
 216                 free(new->ypc_map);
 217                 free(new);
 218                 return;
 219         }
 220
 221         new->ypc_expire_t = time(NULL) + YPLIB_EXPIRE;
 222         new->ypc_key.keydat_len = key->keydat_len;
 223         new->ypc_val.valdat_len = val->valdat_len;
 224         bcopy(key->keydat_val, new->ypc_key.keydat_val, key->keydat_len);
 225         bcopy(val->valdat_val, new->ypc_val.valdat_val, val->valdat_len);
 226
 227         new->ypc_next = ypdb->cache;
 228         ypdb->cache = new;
 229
 230         ypdb->ypmatch_cachecnt++;
 231
 232         return;
 233 }
 234
 235 static bool_t
 236 ypmatch_cache_lookup(struct dom_binding *ypdb, char *map, keydat *key,
 237     valdat *val)
 238 {
 239         struct ypmatch_ent      *c;
 240
 241         ypmatch_cache_expire(ypdb);
 242
 243         for (c = ypdb->cache; c != NULL; c = c->ypc_next) {
 244                 if (strcmp(map, c->ypc_map))
 245                         continue;
 246                 if (key->keydat_len != c->ypc_key.keydat_len)
 247                         continue;
 248                 if (bcmp(key->keydat_val, c->ypc_key.keydat_val,
 249                                 key->keydat_len))
 250                         continue;
 251         }
 252
 253         if (c == NULL)
 254                 return(FALSE);
 255
 256         val->valdat_len = c->ypc_val.valdat_len;
 257         val->valdat_val = c->ypc_val.valdat_val;
 258
 259         return(TRUE);
 260 }
 261 #endif
 262
 263 const char *
 264 ypbinderr_string(int incode)
 265 {
 266         static char err[80];
 267         switch (incode) {
 268         case 0:
 269                 return ("Success");
 270         case YPBIND_ERR_ERR:
 271                 return ("Internal ypbind error");
 272         case YPBIND_ERR_NOSERV:
 273                 return ("Domain not bound");
 274         case YPBIND_ERR_RESC:
 275                 return ("System resource allocation failure");
 276         }
 277         sprintf(err, "Unknown ypbind error: #%d\n", incode);
 278         return (err);
 279 }
 280
 281 int
 282 _yp_dobind(char *dom, struct dom_binding **ypdb)
 283 {
 284         static pid_t pid = -1;
 285         char path[MAXPATHLEN];
 286         struct dom_binding *ysd, *ysd2;
 287         struct ypbind_resp ypbr;
 288         struct timeval tv;
 289         struct sockaddr_in clnt_sin;
 290         int clnt_sock, fd;
 291         pid_t gpid;
 292         CLIENT *client;
 293         int new = 0, r;
 294         int retries = 0;
 295         struct sockaddr_in check;
 296         socklen_t checklen = sizeof(struct sockaddr_in);
 297
 298         /* Not allowed; bad doggie. Bad. */
 299         if (strchr(dom, '/') != NULL)
 300                 return(YPERR_BADARGS);
 301
 302         gpid = getpid();
 303         if (!(pid == -1 || pid == gpid)) {
 304                 ysd = _ypbindlist;
 305                 while (ysd) {
 306                         if (ysd->dom_client != NULL)
 307                                 _yp_unbind(ysd);
 308                         ysd2 = ysd->dom_pnext;
 309                         free(ysd);
 310                         ysd = ysd2;
 311                 }
 312                 _ypbindlist = NULL;
 313         }
 314         pid = gpid;
 315
 316         if (ypdb != NULL)
 317                 *ypdb = NULL;
 318
 319         if (dom == NULL || strlen(dom) == 0)
 320                 return (YPERR_BADARGS);
 321
 322         for (ysd = _ypbindlist; ysd; ysd = ysd->dom_pnext)
 323                 if (strcmp(dom, ysd->dom_domain) == 0)
 324                         break;
 325
 326
 327         if (ysd == NULL) {
 328                 ysd = (struct dom_binding *)malloc(sizeof *ysd);
 329                 if (ysd == NULL)
 330                         return (YPERR_RESRC);
 331                 bzero((char *)ysd, sizeof *ysd);
 332                 ysd->dom_socket = -1;
 333                 ysd->dom_vers = 0;
 334                 new = 1;
 335         } else {
 336         /* Check the socket -- may have been hosed by the caller. */
 337                 if (_getsockname(ysd->dom_socket, (struct sockaddr *)&check,
 338                     &checklen) == -1 || check.sin_family != AF_INET ||
 339                     check.sin_port != ysd->dom_local_port) {
 340                 /* Socket became bogus somehow... need to rebind. */
 341                         int save, sock;
 342
 343                         sock = ysd->dom_socket;
 344                         save = _dup(ysd->dom_socket);
 345                         if (ysd->dom_client != NULL)
 346                                 clnt_destroy(ysd->dom_client);
 347                         ysd->dom_vers = 0;
 348                         ysd->dom_client = NULL;
 349                         sock = _dup2(save, sock);
 350                         _close(save);
 351                 }
 352         }
 353
 354 again:
 355         retries++;
 356         if (retries > MAX_RETRIES) {
 357                 if (new)
 358                         free(ysd);
 359                 return(YPERR_YPBIND);
 360         }
 361 #ifdef BINDINGDIR
 362         if (ysd->dom_vers == 0) {
 363                 /*
 364                  * We're trying to make a new binding: zorch the
 365                  * existing handle now (if any).
 366                  */
 367                 if (ysd->dom_client != NULL) {
 368                         clnt_destroy(ysd->dom_client);
 369                         ysd->dom_client = NULL;
 370                         ysd->dom_socket = -1;
 371                 }
 372                 snprintf(path, sizeof(path), "%s/%s.%d", BINDINGDIR, dom, 2);
 373                 if ((fd = _open(path, O_RDONLY | O_CLOEXEC)) == -1) {
 374                         /* no binding file, YP is dead. */
 375                         /* Try to bring it back to life. */
 376                         _close(fd);
 377                         goto skipit;
 378                 }
 379                 if (_flock(fd, LOCK_EX|LOCK_NB) == -1 && errno == EWOULDBLOCK) {
 380                         struct iovec iov[2];
 381                         struct ypbind_resp ybr;
 382                         u_short ypb_port;
 383
 384                         iov[0].iov_base = (caddr_t)&ypb_port;
 385                         iov[0].iov_len = sizeof ypb_port;
 386                         iov[1].iov_base = (caddr_t)&ybr;
 387                         iov[1].iov_len = sizeof ybr;
 388
 389                         r = _readv(fd, iov, 2);
 390                         if (r != iov[0].iov_len + iov[1].iov_len) {
 391                                 _close(fd);
 392                                 ysd->dom_vers = -1;
 393                                 goto again;
 394                         }
 395
 396                         bzero(&ysd->dom_server_addr, sizeof ysd->dom_server_addr);
 397                         ysd->dom_server_addr.sin_family = AF_INET;
 398                         ysd->dom_server_addr.sin_len = sizeof(struct sockaddr_in);
 399                         bcopy(&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr,
 400                             &ysd->dom_server_addr.sin_addr.s_addr,
 401                             sizeof(ysd->dom_server_addr.sin_addr.s_addr));
 402                         bcopy(&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port,
 403                             &ysd->dom_server_addr.sin_port,
 404                             sizeof(ysd->dom_server_addr.sin_port));
 405
 406                         ysd->dom_server_port = ysd->dom_server_addr.sin_port;
 407                         _close(fd);
 408                         goto gotit;
 409                 } else {
 410                         /* no lock on binding file, YP is dead. */
 411                         /* Try to bring it back to life. */
 412                         _close(fd);
 413                         goto skipit;
 414                 }
 415         }
 416 skipit:
 417 #endif
 418         if (ysd->dom_vers == -1 || ysd->dom_vers == 0) {
 419                 /*
 420                  * We're trying to make a new binding: zorch the
 421                  * existing handle now (if any).
 422                  */
 423                 if (ysd->dom_client != NULL) {
 424                         clnt_destroy(ysd->dom_client);
 425                         ysd->dom_client = NULL;
 426                         ysd->dom_socket = -1;
 427                 }
 428                 bzero((char *)&clnt_sin, sizeof clnt_sin);
 429                 clnt_sin.sin_family = AF_INET;
 430                 clnt_sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 431
 432                 clnt_sock = RPC_ANYSOCK;
 433                 client = clnttcp_create(&clnt_sin, YPBINDPROG, YPBINDVERS, &clnt_sock,
 434                         0, 0);
 435                 if (client == NULL) {
 436                         /*
 437                          * These conditions indicate ypbind just isn't
 438                          * alive -- we probably don't want to shoot our
 439                          * mouth off in this case; instead generate error
 440                          * messages only for really exotic problems.
 441                          */
 442                         if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED &&
 443                            (rpc_createerr.cf_stat != RPC_SYSTEMERROR &&
 444                            rpc_createerr.cf_error.re_errno == ECONNREFUSED))
 445                                 clnt_pcreateerror("clnttcp_create");
 446                         if (new)
 447                                 free(ysd);
 448                         return (YPERR_YPBIND);
 449                 }
 450
 451                 /*
 452                  * Check the port number -- should be < IPPORT_RESERVED.
 453                  * If not, it's possible someone has registered a bogus
 454                  * ypbind with the portmapper and is trying to trick us.
 455                  */
 456                 if (ntohs(clnt_sin.sin_port) >= IPPORT_RESERVED) {
 457                         if (client != NULL)
 458                                 clnt_destroy(client);
 459                         if (new)
 460                                 free(ysd);
 461                         return(YPERR_YPBIND);
 462                 }
 463                 tv.tv_sec = _yplib_timeout/2;
 464                 tv.tv_usec = 0;
 465                 r = clnt_call(client, YPBINDPROC_DOMAIN,
 466                         (xdrproc_t)xdr_domainname, &dom,
 467                         (xdrproc_t)xdr_ypbind_resp, &ypbr, tv);
 468                 if (r != RPC_SUCCESS) {
 469                         clnt_destroy(client);
 470                         ysd->dom_vers = -1;
 471                         if (r == RPC_PROGUNAVAIL || r == RPC_PROCUNAVAIL) {
 472                                 if (new)
 473                                         free(ysd);
 474                                 return(YPERR_YPBIND);
 475                         }
 476                         fprintf(stderr,
 477                         "YP: server for domain %s not responding, retrying\n", dom);
 478                         goto again;
 479                 } else {
 480                         if (ypbr.ypbind_status != YPBIND_SUCC_VAL) {
 481                                 struct timespec time_to_sleep, time_remaining;
 482
 483                                 clnt_destroy(client);
 484                                 ysd->dom_vers = -1;
 485
 486                                 time_to_sleep.tv_sec = _yplib_timeout/2;
 487                                 time_to_sleep.tv_nsec = 0;
 488                                 _nanosleep(&time_to_sleep,
 489                                     &time_remaining);
 490                                 goto again;
 491                         }
 492                 }
 493                 clnt_destroy(client);
 494
 495                 bzero((char *)&ysd->dom_server_addr, sizeof ysd->dom_server_addr);
 496                 ysd->dom_server_addr.sin_family = AF_INET;
 497                 bcopy(&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port,
 498                     &ysd->dom_server_addr.sin_port,
 499                     sizeof(ysd->dom_server_addr.sin_port));
 500                 bcopy(&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr,
 501                     &ysd->dom_server_addr.sin_addr.s_addr,
 502                     sizeof(ysd->dom_server_addr.sin_addr.s_addr));
 503
 504                 /*
 505                  * We could do a reserved port check here too, but this
 506                  * could pose compatibility problems. The local ypbind is
 507                  * supposed to decide whether or not to trust yp servers
 508                  * on insecure ports. For now, we trust its judgement.
 509                  */
 510                 ysd->dom_server_port =
 511                         *(u_short *)&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port;
 512 gotit:
 513                 ysd->dom_vers = YPVERS;
 514                 strlcpy(ysd->dom_domain, dom, sizeof(ysd->dom_domain));
 515         }
 516
 517         /* Don't rebuild the connection to the server unless we have to. */
 518         if (ysd->dom_client == NULL) {
 519                 tv.tv_sec = _yplib_timeout/2;
 520                 tv.tv_usec = 0;
 521                 ysd->dom_socket = RPC_ANYSOCK;
 522                 ysd->dom_client = clntudp_bufcreate(&ysd->dom_server_addr,
 523                     YPPROG, YPVERS, tv, &ysd->dom_socket, 65507, 65507);
 524                 if (ysd->dom_client == NULL) {
 525                         clnt_pcreateerror("clntudp_create");
 526                         ysd->dom_vers = -1;
 527                         goto again;
 528                 }
 529                 if (_fcntl(ysd->dom_socket, F_SETFD, 1) == -1)
 530                         perror("fcntl: F_SETFD");
 531                 /*
 532                  * We want a port number associated with this socket
 533                  * so that we can check its authenticity later.
 534                  */
 535                 checklen = sizeof(struct sockaddr_in);
 536                 bzero((char *)&check, checklen);
 537                 _bind(ysd->dom_socket, (struct sockaddr *)&check, checklen);
 538                 check.sin_family = AF_INET;
 539                 if (!_getsockname(ysd->dom_socket,
 540                     (struct sockaddr *)&check, &checklen)) {
 541                         ysd->dom_local_port = check.sin_port;
 542                 } else {
 543                         clnt_destroy(ysd->dom_client);
 544                         if (new)
 545                                 free(ysd);
 546                         return(YPERR_YPBIND);
 547                 }
 548         }
 549
 550         if (new) {
 551                 ysd->dom_pnext = _ypbindlist;
 552                 _ypbindlist = ysd;
 553         }
 554
 555         /*
 556          * Set low retry timeout to realistically handle UDP packet
 557          * loss for YP packet bursts.
 558          */
 559         tv.tv_sec = 1;
 560         tv.tv_usec = 0;
 561         clnt_control(ysd->dom_client, CLSET_RETRY_TIMEOUT, (char*)&tv);
 562
 563         if (ypdb != NULL)
 564                 *ypdb = ysd;
 565         return (0);
 566 }
 567
 568 static void
 569 _yp_unbind(struct dom_binding *ypb)
 570 {
 571         struct sockaddr_in check;
 572         socklen_t checklen = sizeof(struct sockaddr_in);
 573
 574         if (ypb->dom_client != NULL) {
 575                 /* Check the socket -- may have been hosed by the caller. */
 576                 if (_getsockname(ypb->dom_socket, (struct sockaddr *)&check,
 577                 &checklen) == -1 || check.sin_family != AF_INET ||
 578                 check.sin_port != ypb->dom_local_port) {
 579                         int save, sock;
 580
 581                         sock = ypb->dom_socket;
 582                         save = _dup(ypb->dom_socket);
 583                         clnt_destroy(ypb->dom_client);
 584                         sock = _dup2(save, sock);
 585                         _close(save);
 586                 } else
 587                         clnt_destroy(ypb->dom_client);
 588         }
 589
 590         ypb->dom_client = NULL;
 591         ypb->dom_socket = -1;
 592         ypb->dom_vers = -1;
 593 #ifdef YPMATCHCACHE
 594         ypmatch_cache_flush(ypb);
 595 #endif
 596 }
 597
 598 static int
 599 yp_bind_locked(char *dom)
 600 {
 601         return (_yp_dobind(dom, NULL));
 602 }
 603
 604 int
 605 yp_bind(char *dom)
 606 {
 607         int r;
 608
 609         YPLOCK();
 610         r = yp_bind_locked(dom);
 611         YPUNLOCK();
 612         return (r);
 613 }
 614
 615 static void
 616 yp_unbind_locked(char *dom)
 617 {
 618         struct dom_binding *ypb, *ypbp;
 619
 620         ypbp = NULL;
 621         for (ypb = _ypbindlist; ypb; ypb = ypb->dom_pnext) {
 622                 if (strcmp(dom, ypb->dom_domain) == 0) {
 623                         _yp_unbind(ypb);
 624                         if (ypbp)
 625                                 ypbp->dom_pnext = ypb->dom_pnext;
 626                         else
 627                                 _ypbindlist = ypb->dom_pnext;
 628                         free(ypb);
 629                         return;
 630                 }
 631                 ypbp = ypb;
 632         }
 633         return;
 634 }
 635
 636 void
 637 yp_unbind(char *dom)
 638 {
 639         YPLOCK();
 640         yp_unbind_locked(dom);
 641         YPUNLOCK();
 642 }
 643
 644 int
 645 yp_match(char *indomain, char *inmap, const char *inkey, int inkeylen,
 646     char **outval, int *outvallen)
 647 {
 648         struct dom_binding *ysd;
 649         struct ypresp_val yprv;
 650         struct timeval tv;
 651         struct ypreq_key yprk;
 652         int r;
 653         int retries = 0;
 654         *outval = NULL;
 655         *outvallen = 0;
 656
 657         /* Sanity check */
 658
 659         if (inkey == NULL || !strlen(inkey) || inkeylen <= 0 ||
 660             inmap == NULL || !strlen(inmap) ||
 661             indomain == NULL || !strlen(indomain))
 662                 return (YPERR_BADARGS);
 663
 664         YPLOCK();
 665         if (_yp_dobind(indomain, &ysd) != 0) {
 666                 YPUNLOCK();
 667                 return(YPERR_DOMAIN);
 668         }
 669
 670         yprk.domain = indomain;
 671         yprk.map = inmap;
 672         yprk.key.keydat_val = (char *)inkey;
 673         yprk.key.keydat_len = inkeylen;
 674
 675 #ifdef YPMATCHCACHE
 676         if (ypmatch_cache_lookup(ysd, yprk.map, &yprk.key, &yprv.val) == TRUE) {
 677 /*
 678         if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
 679             inkeylen, &yprv.val.valdat_val, &yprv.val.valdat_len)) {
 680 */
 681                 *outvallen = yprv.val.valdat_len;
 682                 *outval = (char *)malloc(*outvallen+1);
 683                 if (*outval == NULL) {
 684                         _yp_unbind(ysd);
 685                         *outvallen = 0;
 686                         YPUNLOCK();
 687                         return (YPERR_RESRC);
 688                 }
 689                 bcopy(yprv.val.valdat_val, *outval, *outvallen);
 690                 (*outval)[*outvallen] = '\0';
 691                 YPUNLOCK();
 692                 return (0);
 693         }
 694         _yp_unbind(ysd);
 695 #endif
 696
 697 again:
 698         if (retries > MAX_RETRIES) {
 699                 YPUNLOCK();
 700                 return (YPERR_RPC);
 701         }
 702
 703         if (_yp_dobind(indomain, &ysd) != 0) {
 704                 YPUNLOCK();
 705                 return (YPERR_DOMAIN);
 706         }
 707
 708         tv.tv_sec = _yplib_timeout;
 709         tv.tv_usec = 0;
 710
 711         bzero((char *)&yprv, sizeof yprv);
 712
 713         r = clnt_call(ysd->dom_client, YPPROC_MATCH,
 714                 (xdrproc_t)xdr_ypreq_key, &yprk,
 715                 (xdrproc_t)xdr_ypresp_val, &yprv, tv);
 716         if (r != RPC_SUCCESS) {
 717                 clnt_perror(ysd->dom_client, "yp_match: clnt_call");
 718                 _yp_unbind(ysd);
 719                 retries++;
 720                 goto again;
 721         }
 722
 723         if (!(r = ypprot_err(yprv.stat))) {
 724                 *outvallen = yprv.val.valdat_len;
 725                 *outval = (char *)malloc(*outvallen+1);
 726                 if (*outval == NULL) {
 727                         _yp_unbind(ysd);
 728                         *outvallen = 0;
 729                         xdr_free((xdrproc_t)xdr_ypresp_val, &yprv);
 730                         YPUNLOCK();
 731                         return (YPERR_RESRC);
 732                 }
 733                 bcopy(yprv.val.valdat_val, *outval, *outvallen);
 734                 (*outval)[*outvallen] = '\0';
 735 #ifdef YPMATCHCACHE
 736                 ypmatch_cache_insert(ysd, yprk.map, &yprk.key, &yprv.val);
 737 #endif
 738         }
 739
 740         xdr_free((xdrproc_t)xdr_ypresp_val, &yprv);
 741         YPUNLOCK();
 742         return (r);
 743 }
 744
 745 static int
 746 yp_get_default_domain_locked(char **domp)
 747 {
 748         *domp = NULL;
 749         if (_yp_domain[0] == '\0')
 750                 if (getdomainname(_yp_domain, sizeof _yp_domain))
 751                         return (YPERR_NODOM);
 752         *domp = _yp_domain;
 753         return (0);
 754 }
 755
 756 int
 757 yp_get_default_domain(char **domp)
 758 {
 759         int r;
 760
 761         YPLOCK();
 762         r = yp_get_default_domain_locked(domp);
 763         YPUNLOCK();
 764         return (r);
 765 }
 766
 767 int
 768 yp_first(char *indomain, char *inmap, char **outkey, int *outkeylen,
 769     char **outval, int *outvallen)
 770 {
 771         struct ypresp_key_val yprkv;
 772         struct ypreq_nokey yprnk;
 773         struct dom_binding *ysd;
 774         struct timeval tv;
 775         int r;
 776         int retries = 0;
 777         /* Sanity check */
 778
 779         if (indomain == NULL || !strlen(indomain) ||
 780             inmap == NULL || !strlen(inmap))
 781                 return (YPERR_BADARGS);
 782
 783         *outkey = *outval = NULL;
 784         *outkeylen = *outvallen = 0;
 785
 786         YPLOCK();
 787 again:
 788         if (retries > MAX_RETRIES) {
 789                 YPUNLOCK();
 790                 return (YPERR_RPC);
 791         }
 792
 793         if (_yp_dobind(indomain, &ysd) != 0) {
 794                 YPUNLOCK();
 795                 return (YPERR_DOMAIN);
 796         }
 797
 798         tv.tv_sec = _yplib_timeout;
 799         tv.tv_usec = 0;
 800
 801         yprnk.domain = indomain;
 802         yprnk.map = inmap;
 803         bzero((char *)&yprkv, sizeof yprkv);
 804
 805         r = clnt_call(ysd->dom_client, YPPROC_FIRST,
 806                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 807                 (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
 808         if (r != RPC_SUCCESS) {
 809                 clnt_perror(ysd->dom_client, "yp_first: clnt_call");
 810                 _yp_unbind(ysd);
 811                 retries++;
 812                 goto again;
 813         }
 814         if (!(r = ypprot_err(yprkv.stat))) {
 815                 *outkeylen = yprkv.key.keydat_len;
 816                 *outkey = (char *)malloc(*outkeylen+1);
 817                 if (*outkey == NULL) {
 818                         _yp_unbind(ysd);
 819                         *outkeylen = 0;
 820                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 821                         YPUNLOCK();
 822                         return (YPERR_RESRC);
 823                 }
 824                 bcopy(yprkv.key.keydat_val, *outkey, *outkeylen);
 825                 (*outkey)[*outkeylen] = '\0';
 826                 *outvallen = yprkv.val.valdat_len;
 827                 *outval = (char *)malloc(*outvallen+1);
 828                 if (*outval == NULL) {
 829                         free(*outkey);
 830                         _yp_unbind(ysd);
 831                         *outkeylen = *outvallen = 0;
 832                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 833                         YPUNLOCK();
 834                         return (YPERR_RESRC);
 835                 }
 836                 bcopy(yprkv.val.valdat_val, *outval, *outvallen);
 837                 (*outval)[*outvallen] = '\0';
 838         }
 839
 840         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 841         YPUNLOCK();
 842         return (r);
 843 }
 844
 845 int
 846 yp_next(char *indomain, char *inmap, char *inkey, int inkeylen,
 847     char **outkey, int *outkeylen, char **outval, int *outvallen)
 848 {
 849         struct ypresp_key_val yprkv;
 850         struct ypreq_key yprk;
 851         struct dom_binding *ysd;
 852         struct timeval tv;
 853         int r;
 854         int retries = 0;
 855         /* Sanity check */
 856
 857         if (inkey == NULL || !strlen(inkey) || inkeylen <= 0 ||
 858             inmap == NULL || !strlen(inmap) ||
 859             indomain == NULL || !strlen(indomain))
 860                 return (YPERR_BADARGS);
 861
 862         *outkey = *outval = NULL;
 863         *outkeylen = *outvallen = 0;
 864
 865         YPLOCK();
 866 again:
 867         if (retries > MAX_RETRIES) {
 868                 YPUNLOCK();
 869                 return (YPERR_RPC);
 870         }
 871
 872         if (_yp_dobind(indomain, &ysd) != 0) {
 873                 YPUNLOCK();
 874                 return (YPERR_DOMAIN);
 875         }
 876
 877         tv.tv_sec = _yplib_timeout;
 878         tv.tv_usec = 0;
 879
 880         yprk.domain = indomain;
 881         yprk.map = inmap;
 882         yprk.key.keydat_val = inkey;
 883         yprk.key.keydat_len = inkeylen;
 884         bzero((char *)&yprkv, sizeof yprkv);
 885
 886         r = clnt_call(ysd->dom_client, YPPROC_NEXT,
 887                 (xdrproc_t)xdr_ypreq_key, &yprk,
 888                 (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
 889         if (r != RPC_SUCCESS) {
 890                 clnt_perror(ysd->dom_client, "yp_next: clnt_call");
 891                 _yp_unbind(ysd);
 892                 retries++;
 893                 goto again;
 894         }
 895         if (!(r = ypprot_err(yprkv.stat))) {
 896                 *outkeylen = yprkv.key.keydat_len;
 897                 *outkey = (char *)malloc(*outkeylen+1);
 898                 if (*outkey == NULL) {
 899                         _yp_unbind(ysd);
 900                         *outkeylen = 0;
 901                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 902                         YPUNLOCK();
 903                         return (YPERR_RESRC);
 904                 }
 905                 bcopy(yprkv.key.keydat_val, *outkey, *outkeylen);
 906                 (*outkey)[*outkeylen] = '\0';
 907                 *outvallen = yprkv.val.valdat_len;
 908                 *outval = (char *)malloc(*outvallen+1);
 909                 if (*outval == NULL) {
 910                         free(*outkey);
 911                         _yp_unbind(ysd);
 912                         *outkeylen = *outvallen = 0;
 913                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 914                         YPUNLOCK();
 915                         return (YPERR_RESRC);
 916                 }
 917                 bcopy(yprkv.val.valdat_val, *outval, *outvallen);
 918                 (*outval)[*outvallen] = '\0';
 919         }
 920
 921         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 922         YPUNLOCK();
 923         return (r);
 924 }
 925
 926 int
 927 yp_all(char *indomain, char *inmap, struct ypall_callback *incallback)
 928 {
 929         struct ypreq_nokey yprnk;
 930         struct dom_binding *ysd;
 931         struct timeval tv;
 932         struct sockaddr_in clnt_sin;
 933         CLIENT *clnt;
 934         u_long status, savstat;
 935         int clnt_sock;
 936         int retries = 0;
 937         /* Sanity check */
 938
 939         if (indomain == NULL || !strlen(indomain) ||
 940             inmap == NULL || !strlen(inmap))
 941                 return (YPERR_BADARGS);
 942
 943         YPLOCK();
 944 again:
 945         if (retries > MAX_RETRIES) {
 946                 YPUNLOCK();
 947                 return (YPERR_RPC);
 948         }
 949
 950         if (_yp_dobind(indomain, &ysd) != 0) {
 951                 YPUNLOCK();
 952                 return (YPERR_DOMAIN);
 953         }
 954
 955         tv.tv_sec = _yplib_timeout;
 956         tv.tv_usec = 0;
 957
 958         /* YPPROC_ALL manufactures its own channel to ypserv using TCP */
 959
 960         clnt_sock = RPC_ANYSOCK;
 961         clnt_sin = ysd->dom_server_addr;
 962         clnt_sin.sin_port = 0;
 963         clnt = clnttcp_create(&clnt_sin, YPPROG, YPVERS, &clnt_sock, 0, 0);
 964         if (clnt == NULL) {
 965                 YPUNLOCK();
 966                 printf("clnttcp_create failed\n");
 967                 return (YPERR_PMAP);
 968         }
 969
 970         yprnk.domain = indomain;
 971         yprnk.map = inmap;
 972         ypresp_allfn = incallback->foreach;
 973         ypresp_data = (void *)incallback->data;
 974
 975         if (clnt_call(clnt, YPPROC_ALL,
 976                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 977                 (xdrproc_t)xdr_ypresp_all_seq, &status, tv) != RPC_SUCCESS) {
 978                         clnt_perror(clnt, "yp_all: clnt_call");
 979                         clnt_destroy(clnt);
 980                         _yp_unbind(ysd);
 981                         retries++;
 982                         goto again;
 983         }
 984
 985         clnt_destroy(clnt);
 986         savstat = status;
 987         xdr_free((xdrproc_t)xdr_ypresp_all_seq, &status);       /* not really needed... */
 988         YPUNLOCK();
 989         if (savstat != YP_NOMORE)
 990                 return (ypprot_err(savstat));
 991         return (0);
 992 }
 993
 994 int
 995 yp_order(char *indomain, char *inmap, int *outorder)
 996 {
 997         struct dom_binding *ysd;
 998         struct ypresp_order ypro;
 999         struct ypreq_nokey yprnk;
1000         struct timeval tv;
1001         int r;
1002
1003         /* Sanity check */
1004
1005         if (indomain == NULL || !strlen(indomain) ||
1006             inmap == NULL || !strlen(inmap))
1007                 return (YPERR_BADARGS);
1008
1009         YPLOCK();
1010 again:
1011         if (_yp_dobind(indomain, &ysd) != 0) {
1012                 YPUNLOCK();
1013                 return (YPERR_DOMAIN);
1014         }
1015
1016         tv.tv_sec = _yplib_timeout;
1017         tv.tv_usec = 0;
1018
1019         yprnk.domain = indomain;
1020         yprnk.map = inmap;
1021
1022         bzero((char *)(char *)&ypro, sizeof ypro);
1023
1024         r = clnt_call(ysd->dom_client, YPPROC_ORDER,
1025                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
1026                 (xdrproc_t)xdr_ypresp_order, &ypro, tv);
1027
1028         /*
1029          * NIS+ in YP compat mode doesn't support the YPPROC_ORDER
1030          * procedure.
1031          */
1032         if (r == RPC_PROCUNAVAIL) {
1033                 YPUNLOCK();
1034                 return(YPERR_YPERR);
1035         }
1036
1037         if (r != RPC_SUCCESS) {
1038                 clnt_perror(ysd->dom_client, "yp_order: clnt_call");
1039                 _yp_unbind(ysd);
1040                 goto again;
1041         }
1042
1043         if (!(r = ypprot_err(ypro.stat))) {
1044                 *outorder = ypro.ordernum;
1045         }
1046
1047         xdr_free((xdrproc_t)xdr_ypresp_order, &ypro);
1048         YPUNLOCK();
1049         return (r);
1050 }
1051
1052 int
1053 yp_master(char *indomain, char *inmap, char **outname)
1054 {
1055         struct dom_binding *ysd;
1056         struct ypresp_master yprm;
1057         struct ypreq_nokey yprnk;
1058         struct timeval tv;
1059         int r;
1060
1061         /* Sanity check */
1062
1063         if (indomain == NULL || !strlen(indomain) ||
1064             inmap == NULL || !strlen(inmap))
1065                 return (YPERR_BADARGS);
1066         YPLOCK();
1067 again:
1068         if (_yp_dobind(indomain, &ysd) != 0) {
1069                 YPUNLOCK();
1070                 return (YPERR_DOMAIN);
1071         }
1072
1073         tv.tv_sec = _yplib_timeout;
1074         tv.tv_usec = 0;
1075
1076         yprnk.domain = indomain;
1077         yprnk.map = inmap;
1078
1079         bzero((char *)&yprm, sizeof yprm);
1080
1081         r = clnt_call(ysd->dom_client, YPPROC_MASTER,
1082                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
1083                 (xdrproc_t)xdr_ypresp_master, &yprm, tv);
1084         if (r != RPC_SUCCESS) {
1085                 clnt_perror(ysd->dom_client, "yp_master: clnt_call");
1086                 _yp_unbind(ysd);
1087                 goto again;
1088         }
1089
1090         if (!(r = ypprot_err(yprm.stat))) {
1091                 *outname = (char *)strdup(yprm.peer);
1092         }
1093
1094         xdr_free((xdrproc_t)xdr_ypresp_master, &yprm);
1095         YPUNLOCK();
1096         return (r);
1097 }
1098
1099 int
1100 yp_maplist(char *indomain, struct ypmaplist **outmaplist)
1101 {
1102         struct dom_binding *ysd;
1103         struct ypresp_maplist ypml;
1104         struct timeval tv;
1105         int r;
1106
1107         /* Sanity check */
1108
1109         if (indomain == NULL || !strlen(indomain))
1110                 return (YPERR_BADARGS);
1111
1112         YPLOCK();
1113 again:
1114         if (_yp_dobind(indomain, &ysd) != 0) {
1115                 YPUNLOCK();
1116                 return (YPERR_DOMAIN);
1117         }
1118
1119         tv.tv_sec = _yplib_timeout;
1120         tv.tv_usec = 0;
1121
1122         bzero((char *)&ypml, sizeof ypml);
1123
1124         r = clnt_call(ysd->dom_client, YPPROC_MAPLIST,
1125                 (xdrproc_t)xdr_domainname, &indomain,
1126                 (xdrproc_t)xdr_ypresp_maplist, &ypml,tv);
1127         if (r != RPC_SUCCESS) {
1128                 clnt_perror(ysd->dom_client, "yp_maplist: clnt_call");
1129                 _yp_unbind(ysd);
1130                 goto again;
1131         }
1132         if (!(r = ypprot_err(ypml.stat))) {
1133                 *outmaplist = ypml.maps;
1134         }
1135
1136         /* NO: xdr_free((xdrproc_t)xdr_ypresp_maplist, &ypml);*/
1137         YPUNLOCK();
1138         return (r);
1139 }
1140
1141 const char *
1142 yperr_string(int incode)
1143 {
1144         static char err[80];
1145
1146         switch (incode) {
1147         case 0:
1148                 return ("Success");
1149         case YPERR_BADARGS:
1150                 return ("Request arguments bad");
1151         case YPERR_RPC:
1152                 return ("RPC failure");
1153         case YPERR_DOMAIN:
1154                 return ("Can't bind to server which serves this domain");
1155         case YPERR_MAP:
1156                 return ("No such map in server's domain");
1157         case YPERR_KEY:
1158                 return ("No such key in map");
1159         case YPERR_YPERR:
1160                 return ("YP server error");
1161         case YPERR_RESRC:
1162                 return ("Local resource allocation failure");
1163         case YPERR_NOMORE:
1164                 return ("No more records in map database");
1165         case YPERR_PMAP:
1166                 return ("Can't communicate with portmapper");
1167         case YPERR_YPBIND:
1168                 return ("Can't communicate with ypbind");
1169         case YPERR_YPSERV:
1170                 return ("Can't communicate with ypserv");
1171         case YPERR_NODOM:
1172                 return ("Local domain name not set");
1173         case YPERR_BADDB:
1174                 return ("Server data base is bad");
1175         case YPERR_VERS:
1176                 return ("YP server version mismatch - server can't supply service.");
1177         case YPERR_ACCESS:
1178                 return ("Access violation");
1179         case YPERR_BUSY:
1180                 return ("Database is busy");
1181         }
1182         sprintf(err, "YP unknown error %d\n", incode);
1183         return (err);
1184 }
1185
1186 int
1187 ypprot_err(unsigned int incode)
1188 {
1189         switch (incode) {
1190         case YP_TRUE:
1191                 return (0);
1192         case YP_FALSE:
1193                 return (YPERR_YPBIND);
1194         case YP_NOMORE:
1195                 return (YPERR_NOMORE);
1196         case YP_NOMAP:
1197                 return (YPERR_MAP);
1198         case YP_NODOM:
1199                 return (YPERR_DOMAIN);
1200         case YP_NOKEY:
1201                 return (YPERR_KEY);
1202         case YP_BADOP:
1203                 return (YPERR_YPERR);
1204         case YP_BADDB:
1205                 return (YPERR_BADDB);
1206         case YP_YPERR:
1207                 return (YPERR_YPERR);
1208         case YP_BADARGS:
1209                 return (YPERR_BADARGS);
1210         case YP_VERS:
1211                 return (YPERR_VERS);
1212         }
1213         return (YPERR_YPERR);
1214 }
1215
1216 int
1217 _yp_check(char **dom)
1218 {
1219         char *unused;
1220
1221         YPLOCK();
1222         if (_yp_domain[0]=='\0')
1223                 if (yp_get_default_domain_locked(&unused)) {
1224                         YPUNLOCK();
1225                         return (0);
1226                 }
1227
1228         if (dom)
1229                 *dom = _yp_domain;
1230
1231         if (yp_bind_locked(_yp_domain) == 0) {
1232                 yp_unbind_locked(_yp_domain);
1233                 YPUNLOCK();
1234                 return (1);
1235         }
1236         YPUNLOCK();
1237         return (0);
1238 }