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 bool_t xdr_ypresp_all_seq(XDR *xdrs, u_long *objp);
  96
  97 int (*ypresp_allfn)();
  98 void *ypresp_data;
  99
 100 static void _yp_unbind(struct dom_binding *);
 101 struct dom_binding *_ypbindlist;
 102 static char _yp_domain[MAXHOSTNAMELEN];
 103 int _yplib_timeout = 20;
 104
 105 static mutex_t _ypmutex = MUTEX_INITIALIZER;
 106 #define YPLOCK()        mutex_lock(&_ypmutex);
 107 #define YPUNLOCK()      mutex_unlock(&_ypmutex);
 108
 109 #ifdef YPMATCHCACHE
 110 static void
 111 ypmatch_cache_delete(struct dom_binding *ypdb, struct ypmatch_ent *prev,
 112     struct ypmatch_ent *cur)
 113 {
 114         if (prev == NULL)
 115                 ypdb->cache = cur->ypc_next;
 116         else
 117                 prev->ypc_next = cur->ypc_next;
 118
 119         free(cur->ypc_map);
 120         free(cur->ypc_key.keydat_val);
 121         free(cur->ypc_val.valdat_val);
 122         free(cur);
 123
 124         ypdb->ypmatch_cachecnt--;
 125
 126         return;
 127 }
 128
 129 static void
 130 ypmatch_cache_flush(struct dom_binding *ypdb)
 131 {
 132         struct ypmatch_ent      *n, *c = ypdb->cache;
 133
 134         while (c != NULL) {
 135                 n = c->ypc_next;
 136                 ypmatch_cache_delete(ypdb, NULL, c);
 137                 c = n;
 138         }
 139
 140         return;
 141 }
 142
 143 static void
 144 ypmatch_cache_expire(struct dom_binding *ypdb)
 145 {
 146         struct ypmatch_ent      *c = ypdb->cache;
 147         struct ypmatch_ent      *n, *p = NULL;
 148         time_t                  t;
 149
 150         time(&t);
 151
 152         while (c != NULL) {
 153                 if (t >= c->ypc_expire_t) {
 154                         n = c->ypc_next;
 155                         ypmatch_cache_delete(ypdb, p, c);
 156                         c = n;
 157                 } else {
 158                         p = c;
 159                         c = c->ypc_next;
 160                 }
 161         }
 162
 163         return;
 164 }
 165
 166 static void
 167 ypmatch_cache_insert(struct dom_binding *ypdb, char *map, keydat *key,
 168     valdat *val)
 169 {
 170         struct ypmatch_ent      *new;
 171
 172         /* Do an expire run to maybe open up a slot. */
 173         if (ypdb->ypmatch_cachecnt)
 174                 ypmatch_cache_expire(ypdb);
 175
 176         /*
 177          * If there are no slots free, then force an expire of
 178          * the least recently used entry.
 179          */
 180         if (ypdb->ypmatch_cachecnt >= YPLIB_MAXCACHE) {
 181                 struct ypmatch_ent      *o = NULL, *c = ypdb->cache;
 182                 time_t                  oldest = 0;
 183
 184                 oldest = ~oldest;
 185
 186                 while (c != NULL) {
 187                         if (c->ypc_expire_t < oldest) {
 188                                 oldest = c->ypc_expire_t;
 189                                 o = c;
 190                         }
 191                         c = c->ypc_next;
 192                 }
 193
 194                 if (o == NULL)
 195                         return;
 196                 o->ypc_expire_t = 0;
 197                 ypmatch_cache_expire(ypdb);
 198         }
 199
 200         new = malloc(sizeof(struct ypmatch_ent));
 201         if (new == NULL)
 202                 return;
 203
 204         new->ypc_map = strdup(map);
 205         if (new->ypc_map == NULL) {
 206                 free(new);
 207                 return;
 208         }
 209         new->ypc_key.keydat_val = malloc(key->keydat_len);
 210         if (new->ypc_key.keydat_val == NULL) {
 211                 free(new->ypc_map);
 212                 free(new);
 213                 return;
 214         }
 215         new->ypc_val.valdat_val = malloc(val->valdat_len);
 216         if (new->ypc_val.valdat_val == NULL) {
 217                 free(new->ypc_val.valdat_val);
 218                 free(new->ypc_map);
 219                 free(new);
 220                 return;
 221         }
 222
 223         new->ypc_expire_t = time(NULL) + YPLIB_EXPIRE;
 224         new->ypc_key.keydat_len = key->keydat_len;
 225         new->ypc_val.valdat_len = val->valdat_len;
 226         bcopy(key->keydat_val, new->ypc_key.keydat_val, key->keydat_len);
 227         bcopy(val->valdat_val, new->ypc_val.valdat_val, val->valdat_len);
 228
 229         new->ypc_next = ypdb->cache;
 230         ypdb->cache = new;
 231
 232         ypdb->ypmatch_cachecnt++;
 233
 234         return;
 235 }
 236
 237 static bool_t
 238 ypmatch_cache_lookup(struct dom_binding *ypdb, char *map, keydat *key,
 239     valdat *val)
 240 {
 241         struct ypmatch_ent      *c;
 242
 243         ypmatch_cache_expire(ypdb);
 244
 245         for (c = ypdb->cache; c != NULL; c = c->ypc_next) {
 246                 if (strcmp(map, c->ypc_map))
 247                         continue;
 248                 if (key->keydat_len != c->ypc_key.keydat_len)
 249                         continue;
 250                 if (bcmp(key->keydat_val, c->ypc_key.keydat_val,
 251                                 key->keydat_len))
 252                         continue;
 253         }
 254
 255         if (c == NULL)
 256                 return(FALSE);
 257
 258         val->valdat_len = c->ypc_val.valdat_len;
 259         val->valdat_val = c->ypc_val.valdat_val;
 260
 261         return(TRUE);
 262 }
 263 #endif
 264
 265 const char *
 266 ypbinderr_string(int incode)
 267 {
 268         static char err[80];
 269         switch (incode) {
 270         case 0:
 271                 return ("Success");
 272         case YPBIND_ERR_ERR:
 273                 return ("Internal ypbind error");
 274         case YPBIND_ERR_NOSERV:
 275                 return ("Domain not bound");
 276         case YPBIND_ERR_RESC:
 277                 return ("System resource allocation failure");
 278         }
 279         sprintf(err, "Unknown ypbind error: #%d\n", incode);
 280         return (err);
 281 }
 282
 283 int
 284 _yp_dobind(char *dom, struct dom_binding **ypdb)
 285 {
 286         static pid_t pid = -1;
 287         char path[MAXPATHLEN];
 288         struct dom_binding *ysd, *ysd2;
 289         struct ypbind_resp ypbr;
 290         struct timeval tv;
 291         struct sockaddr_in clnt_sin;
 292         int clnt_sock, fd;
 293         pid_t gpid;
 294         CLIENT *client;
 295         int new = 0, r;
 296         int retries = 0;
 297         struct sockaddr_in check;
 298         socklen_t checklen = sizeof(struct sockaddr_in);
 299
 300         /* Not allowed; bad doggie. Bad. */
 301         if (strchr(dom, '/') != NULL)
 302                 return(YPERR_BADARGS);
 303
 304         gpid = getpid();
 305         if (!(pid == -1 || pid == gpid)) {
 306                 ysd = _ypbindlist;
 307                 while (ysd) {
 308                         if (ysd->dom_client != NULL)
 309                                 _yp_unbind(ysd);
 310                         ysd2 = ysd->dom_pnext;
 311                         free(ysd);
 312                         ysd = ysd2;
 313                 }
 314                 _ypbindlist = NULL;
 315         }
 316         pid = gpid;
 317
 318         if (ypdb != NULL)
 319                 *ypdb = NULL;
 320
 321         if (dom == NULL || strlen(dom) == 0)
 322                 return (YPERR_BADARGS);
 323
 324         for (ysd = _ypbindlist; ysd; ysd = ysd->dom_pnext)
 325                 if (strcmp(dom, ysd->dom_domain) == 0)
 326                         break;
 327
 328
 329         if (ysd == NULL) {
 330                 ysd = (struct dom_binding *)malloc(sizeof *ysd);
 331                 if (ysd == NULL)
 332                         return (YPERR_RESRC);
 333                 bzero((char *)ysd, sizeof *ysd);
 334                 ysd->dom_socket = -1;
 335                 ysd->dom_vers = 0;
 336                 new = 1;
 337         } else {
 338         /* Check the socket -- may have been hosed by the caller. */
 339                 if (_getsockname(ysd->dom_socket, (struct sockaddr *)&check,
 340                     &checklen) == -1 || check.sin_family != AF_INET ||
 341                     check.sin_port != ysd->dom_local_port) {
 342                 /* Socket became bogus somehow... need to rebind. */
 343                         int save, sock;
 344
 345                         sock = ysd->dom_socket;
 346                         save = _dup(ysd->dom_socket);
 347                         if (ysd->dom_client != NULL)
 348                                 clnt_destroy(ysd->dom_client);
 349                         ysd->dom_vers = 0;
 350                         ysd->dom_client = NULL;
 351                         sock = _dup2(save, sock);
 352                         _close(save);
 353                 }
 354         }
 355
 356 again:
 357         retries++;
 358         if (retries > MAX_RETRIES) {
 359                 if (new)
 360                         free(ysd);
 361                 return(YPERR_YPBIND);
 362         }
 363 #ifdef BINDINGDIR
 364         if (ysd->dom_vers == 0) {
 365                 /*
 366                  * We're trying to make a new binding: zorch the
 367                  * existing handle now (if any).
 368                  */
 369                 if (ysd->dom_client != NULL) {
 370                         clnt_destroy(ysd->dom_client);
 371                         ysd->dom_client = NULL;
 372                         ysd->dom_socket = -1;
 373                 }
 374                 snprintf(path, sizeof(path), "%s/%s.%d", BINDINGDIR, dom, 2);
 375                 if ((fd = _open(path, O_RDONLY | O_CLOEXEC)) == -1) {
 376                         /* no binding file, YP is dead. */
 377                         /* Try to bring it back to life. */
 378                         _close(fd);
 379                         goto skipit;
 380                 }
 381                 if (_flock(fd, LOCK_EX|LOCK_NB) == -1 && errno == EWOULDBLOCK) {
 382                         struct iovec iov[2];
 383                         struct ypbind_resp ybr;
 384                         u_short ypb_port;
 385
 386                         iov[0].iov_base = (caddr_t)&ypb_port;
 387                         iov[0].iov_len = sizeof ypb_port;
 388                         iov[1].iov_base = (caddr_t)&ybr;
 389                         iov[1].iov_len = sizeof ybr;
 390
 391                         r = _readv(fd, iov, 2);
 392                         if (r != iov[0].iov_len + iov[1].iov_len) {
 393                                 _close(fd);
 394                                 ysd->dom_vers = -1;
 395                                 goto again;
 396                         }
 397
 398                         bzero(&ysd->dom_server_addr, sizeof ysd->dom_server_addr);
 399                         ysd->dom_server_addr.sin_family = AF_INET;
 400                         ysd->dom_server_addr.sin_len = sizeof(struct sockaddr_in);
 401                         bcopy(&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr,
 402                             &ysd->dom_server_addr.sin_addr.s_addr,
 403                             sizeof(ysd->dom_server_addr.sin_addr.s_addr));
 404                         bcopy(&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port,
 405                             &ysd->dom_server_addr.sin_port,
 406                             sizeof(ysd->dom_server_addr.sin_port));
 407
 408                         ysd->dom_server_port = ysd->dom_server_addr.sin_port;
 409                         _close(fd);
 410                         goto gotit;
 411                 } else {
 412                         /* no lock on binding file, YP is dead. */
 413                         /* Try to bring it back to life. */
 414                         _close(fd);
 415                         goto skipit;
 416                 }
 417         }
 418 skipit:
 419 #endif
 420         if (ysd->dom_vers == -1 || ysd->dom_vers == 0) {
 421                 /*
 422                  * We're trying to make a new binding: zorch the
 423                  * existing handle now (if any).
 424                  */
 425                 if (ysd->dom_client != NULL) {
 426                         clnt_destroy(ysd->dom_client);
 427                         ysd->dom_client = NULL;
 428                         ysd->dom_socket = -1;
 429                 }
 430                 bzero((char *)&clnt_sin, sizeof clnt_sin);
 431                 clnt_sin.sin_family = AF_INET;
 432                 clnt_sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 433
 434                 clnt_sock = RPC_ANYSOCK;
 435                 client = clnttcp_create(&clnt_sin, YPBINDPROG, YPBINDVERS, &clnt_sock,
 436                         0, 0);
 437                 if (client == NULL) {
 438                         /*
 439                          * These conditions indicate ypbind just isn't
 440                          * alive -- we probably don't want to shoot our
 441                          * mouth off in this case; instead generate error
 442                          * messages only for really exotic problems.
 443                          */
 444                         if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED &&
 445                            (rpc_createerr.cf_stat != RPC_SYSTEMERROR &&
 446                            rpc_createerr.cf_error.re_errno == ECONNREFUSED))
 447                                 clnt_pcreateerror("clnttcp_create");
 448                         if (new)
 449                                 free(ysd);
 450                         return (YPERR_YPBIND);
 451                 }
 452
 453                 /*
 454                  * Check the port number -- should be < IPPORT_RESERVED.
 455                  * If not, it's possible someone has registered a bogus
 456                  * ypbind with the portmapper and is trying to trick us.
 457                  */
 458                 if (ntohs(clnt_sin.sin_port) >= IPPORT_RESERVED) {
 459                         if (client != NULL)
 460                                 clnt_destroy(client);
 461                         if (new)
 462                                 free(ysd);
 463                         return(YPERR_YPBIND);
 464                 }
 465                 tv.tv_sec = _yplib_timeout/2;
 466                 tv.tv_usec = 0;
 467                 r = clnt_call(client, YPBINDPROC_DOMAIN,
 468                         (xdrproc_t)xdr_domainname, &dom,
 469                         (xdrproc_t)xdr_ypbind_resp, &ypbr, tv);
 470                 if (r != RPC_SUCCESS) {
 471                         clnt_destroy(client);
 472                         ysd->dom_vers = -1;
 473                         if (r == RPC_PROGUNAVAIL || r == RPC_PROCUNAVAIL) {
 474                                 if (new)
 475                                         free(ysd);
 476                                 return(YPERR_YPBIND);
 477                         }
 478                         fprintf(stderr,
 479                         "YP: server for domain %s not responding, retrying\n", dom);
 480                         goto again;
 481                 } else {
 482                         if (ypbr.ypbind_status != YPBIND_SUCC_VAL) {
 483                                 struct timespec time_to_sleep, time_remaining;
 484
 485                                 clnt_destroy(client);
 486                                 ysd->dom_vers = -1;
 487
 488                                 time_to_sleep.tv_sec = _yplib_timeout/2;
 489                                 time_to_sleep.tv_nsec = 0;
 490                                 _nanosleep(&time_to_sleep,
 491                                     &time_remaining);
 492                                 goto again;
 493                         }
 494                 }
 495                 clnt_destroy(client);
 496
 497                 bzero((char *)&ysd->dom_server_addr, sizeof ysd->dom_server_addr);
 498                 ysd->dom_server_addr.sin_family = AF_INET;
 499                 bcopy(&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port,
 500                     &ysd->dom_server_addr.sin_port,
 501                     sizeof(ysd->dom_server_addr.sin_port));
 502                 bcopy(&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr,
 503                     &ysd->dom_server_addr.sin_addr.s_addr,
 504                     sizeof(ysd->dom_server_addr.sin_addr.s_addr));
 505
 506                 /*
 507                  * We could do a reserved port check here too, but this
 508                  * could pose compatibility problems. The local ypbind is
 509                  * supposed to decide whether or not to trust yp servers
 510                  * on insecure ports. For now, we trust its judgement.
 511                  */
 512                 ysd->dom_server_port =
 513                         *(u_short *)&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port;
 514 gotit:
 515                 ysd->dom_vers = YPVERS;
 516                 strlcpy(ysd->dom_domain, dom, sizeof(ysd->dom_domain));
 517         }
 518
 519         /* Don't rebuild the connection to the server unless we have to. */
 520         if (ysd->dom_client == NULL) {
 521                 tv.tv_sec = _yplib_timeout/2;
 522                 tv.tv_usec = 0;
 523                 ysd->dom_socket = RPC_ANYSOCK;
 524                 ysd->dom_client = clntudp_bufcreate(&ysd->dom_server_addr,
 525                     YPPROG, YPVERS, tv, &ysd->dom_socket, 65507, 65507);
 526                 if (ysd->dom_client == NULL) {
 527                         clnt_pcreateerror("clntudp_create");
 528                         ysd->dom_vers = -1;
 529                         goto again;
 530                 }
 531                 if (_fcntl(ysd->dom_socket, F_SETFD, 1) == -1)
 532                         perror("fcntl: F_SETFD");
 533                 /*
 534                  * We want a port number associated with this socket
 535                  * so that we can check its authenticity later.
 536                  */
 537                 checklen = sizeof(struct sockaddr_in);
 538                 bzero((char *)&check, checklen);
 539                 _bind(ysd->dom_socket, (struct sockaddr *)&check, checklen);
 540                 check.sin_family = AF_INET;
 541                 if (!_getsockname(ysd->dom_socket,
 542                     (struct sockaddr *)&check, &checklen)) {
 543                         ysd->dom_local_port = check.sin_port;
 544                 } else {
 545                         clnt_destroy(ysd->dom_client);
 546                         if (new)
 547                                 free(ysd);
 548                         return(YPERR_YPBIND);
 549                 }
 550         }
 551
 552         if (new) {
 553                 ysd->dom_pnext = _ypbindlist;
 554                 _ypbindlist = ysd;
 555         }
 556
 557         /*
 558          * Set low retry timeout to realistically handle UDP packet
 559          * loss for YP packet bursts.
 560          */
 561         tv.tv_sec = 1;
 562         tv.tv_usec = 0;
 563         clnt_control(ysd->dom_client, CLSET_RETRY_TIMEOUT, (char*)&tv);
 564
 565         if (ypdb != NULL)
 566                 *ypdb = ysd;
 567         return (0);
 568 }
 569
 570 static void
 571 _yp_unbind(struct dom_binding *ypb)
 572 {
 573         struct sockaddr_in check;
 574         socklen_t checklen = sizeof(struct sockaddr_in);
 575
 576         if (ypb->dom_client != NULL) {
 577                 /* Check the socket -- may have been hosed by the caller. */
 578                 if (_getsockname(ypb->dom_socket, (struct sockaddr *)&check,
 579                 &checklen) == -1 || check.sin_family != AF_INET ||
 580                 check.sin_port != ypb->dom_local_port) {
 581                         int save, sock;
 582
 583                         sock = ypb->dom_socket;
 584                         save = _dup(ypb->dom_socket);
 585                         clnt_destroy(ypb->dom_client);
 586                         sock = _dup2(save, sock);
 587                         _close(save);
 588                 } else
 589                         clnt_destroy(ypb->dom_client);
 590         }
 591
 592         ypb->dom_client = NULL;
 593         ypb->dom_socket = -1;
 594         ypb->dom_vers = -1;
 595 #ifdef YPMATCHCACHE
 596         ypmatch_cache_flush(ypb);
 597 #endif
 598 }
 599
 600 static int
 601 yp_bind_locked(char *dom)
 602 {
 603         return (_yp_dobind(dom, NULL));
 604 }
 605
 606 int
 607 yp_bind(char *dom)
 608 {
 609         int r;
 610
 611         YPLOCK();
 612         r = yp_bind_locked(dom);
 613         YPUNLOCK();
 614         return (r);
 615 }
 616
 617 static void
 618 yp_unbind_locked(char *dom)
 619 {
 620         struct dom_binding *ypb, *ypbp;
 621
 622         ypbp = NULL;
 623         for (ypb = _ypbindlist; ypb; ypb = ypb->dom_pnext) {
 624                 if (strcmp(dom, ypb->dom_domain) == 0) {
 625                         _yp_unbind(ypb);
 626                         if (ypbp)
 627                                 ypbp->dom_pnext = ypb->dom_pnext;
 628                         else
 629                                 _ypbindlist = ypb->dom_pnext;
 630                         free(ypb);
 631                         return;
 632                 }
 633                 ypbp = ypb;
 634         }
 635         return;
 636 }
 637
 638 void
 639 yp_unbind(char *dom)
 640 {
 641         YPLOCK();
 642         yp_unbind_locked(dom);
 643         YPUNLOCK();
 644 }
 645
 646 int
 647 yp_match(char *indomain, char *inmap, const char *inkey, int inkeylen,
 648     char **outval, int *outvallen)
 649 {
 650         struct dom_binding *ysd;
 651         struct ypresp_val yprv;
 652         struct timeval tv;
 653         struct ypreq_key yprk;
 654         int r;
 655         int retries = 0;
 656         *outval = NULL;
 657         *outvallen = 0;
 658
 659         /* Sanity check */
 660
 661         if (inkey == NULL || !strlen(inkey) || inkeylen <= 0 ||
 662             inmap == NULL || !strlen(inmap) ||
 663             indomain == NULL || !strlen(indomain))
 664                 return (YPERR_BADARGS);
 665
 666         YPLOCK();
 667         if (_yp_dobind(indomain, &ysd) != 0) {
 668                 YPUNLOCK();
 669                 return(YPERR_DOMAIN);
 670         }
 671
 672         yprk.domain = indomain;
 673         yprk.map = inmap;
 674         yprk.key.keydat_val = (char *)inkey;
 675         yprk.key.keydat_len = inkeylen;
 676
 677 #ifdef YPMATCHCACHE
 678         if (ypmatch_cache_lookup(ysd, yprk.map, &yprk.key, &yprv.val) == TRUE) {
 679 /*
 680         if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
 681             inkeylen, &yprv.val.valdat_val, &yprv.val.valdat_len)) {
 682 */
 683                 *outvallen = yprv.val.valdat_len;
 684                 *outval = (char *)malloc(*outvallen+1);
 685                 if (*outval == NULL) {
 686                         _yp_unbind(ysd);
 687                         *outvallen = 0;
 688                         YPUNLOCK();
 689                         return (YPERR_RESRC);
 690                 }
 691                 bcopy(yprv.val.valdat_val, *outval, *outvallen);
 692                 (*outval)[*outvallen] = '\0';
 693                 YPUNLOCK();
 694                 return (0);
 695         }
 696         _yp_unbind(ysd);
 697 #endif
 698
 699 again:
 700         if (retries > MAX_RETRIES) {
 701                 YPUNLOCK();
 702                 return (YPERR_RPC);
 703         }
 704
 705         if (_yp_dobind(indomain, &ysd) != 0) {
 706                 YPUNLOCK();
 707                 return (YPERR_DOMAIN);
 708         }
 709
 710         tv.tv_sec = _yplib_timeout;
 711         tv.tv_usec = 0;
 712
 713         bzero((char *)&yprv, sizeof yprv);
 714
 715         r = clnt_call(ysd->dom_client, YPPROC_MATCH,
 716                 (xdrproc_t)xdr_ypreq_key, &yprk,
 717                 (xdrproc_t)xdr_ypresp_val, &yprv, tv);
 718         if (r != RPC_SUCCESS) {
 719                 clnt_perror(ysd->dom_client, "yp_match: clnt_call");
 720                 _yp_unbind(ysd);
 721                 retries++;
 722                 goto again;
 723         }
 724
 725         if (!(r = ypprot_err(yprv.stat))) {
 726                 *outvallen = yprv.val.valdat_len;
 727                 *outval = (char *)malloc(*outvallen+1);
 728                 if (*outval == NULL) {
 729                         _yp_unbind(ysd);
 730                         *outvallen = 0;
 731                         xdr_free((xdrproc_t)xdr_ypresp_val, &yprv);
 732                         YPUNLOCK();
 733                         return (YPERR_RESRC);
 734                 }
 735                 bcopy(yprv.val.valdat_val, *outval, *outvallen);
 736                 (*outval)[*outvallen] = '\0';
 737 #ifdef YPMATCHCACHE
 738                 ypmatch_cache_insert(ysd, yprk.map, &yprk.key, &yprv.val);
 739 #endif
 740         }
 741
 742         xdr_free((xdrproc_t)xdr_ypresp_val, &yprv);
 743         YPUNLOCK();
 744         return (r);
 745 }
 746
 747 static int
 748 yp_get_default_domain_locked(char **domp)
 749 {
 750         *domp = NULL;
 751         if (_yp_domain[0] == '\0')
 752                 if (getdomainname(_yp_domain, sizeof _yp_domain))
 753                         return (YPERR_NODOM);
 754         *domp = _yp_domain;
 755         return (0);
 756 }
 757
 758 int
 759 yp_get_default_domain(char **domp)
 760 {
 761         int r;
 762
 763         YPLOCK();
 764         r = yp_get_default_domain_locked(domp);
 765         YPUNLOCK();
 766         return (r);
 767 }
 768
 769 int
 770 yp_first(char *indomain, char *inmap, char **outkey, int *outkeylen,
 771     char **outval, int *outvallen)
 772 {
 773         struct ypresp_key_val yprkv;
 774         struct ypreq_nokey yprnk;
 775         struct dom_binding *ysd;
 776         struct timeval tv;
 777         int r;
 778         int retries = 0;
 779         /* Sanity check */
 780
 781         if (indomain == NULL || !strlen(indomain) ||
 782             inmap == NULL || !strlen(inmap))
 783                 return (YPERR_BADARGS);
 784
 785         *outkey = *outval = NULL;
 786         *outkeylen = *outvallen = 0;
 787
 788         YPLOCK();
 789 again:
 790         if (retries > MAX_RETRIES) {
 791                 YPUNLOCK();
 792                 return (YPERR_RPC);
 793         }
 794
 795         if (_yp_dobind(indomain, &ysd) != 0) {
 796                 YPUNLOCK();
 797                 return (YPERR_DOMAIN);
 798         }
 799
 800         tv.tv_sec = _yplib_timeout;
 801         tv.tv_usec = 0;
 802
 803         yprnk.domain = indomain;
 804         yprnk.map = inmap;
 805         bzero((char *)&yprkv, sizeof yprkv);
 806
 807         r = clnt_call(ysd->dom_client, YPPROC_FIRST,
 808                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 809                 (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
 810         if (r != RPC_SUCCESS) {
 811                 clnt_perror(ysd->dom_client, "yp_first: clnt_call");
 812                 _yp_unbind(ysd);
 813                 retries++;
 814                 goto again;
 815         }
 816         if (!(r = ypprot_err(yprkv.stat))) {
 817                 *outkeylen = yprkv.key.keydat_len;
 818                 *outkey = (char *)malloc(*outkeylen+1);
 819                 if (*outkey == NULL) {
 820                         _yp_unbind(ysd);
 821                         *outkeylen = 0;
 822                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 823                         YPUNLOCK();
 824                         return (YPERR_RESRC);
 825                 }
 826                 bcopy(yprkv.key.keydat_val, *outkey, *outkeylen);
 827                 (*outkey)[*outkeylen] = '\0';
 828                 *outvallen = yprkv.val.valdat_len;
 829                 *outval = (char *)malloc(*outvallen+1);
 830                 if (*outval == NULL) {
 831                         free(*outkey);
 832                         _yp_unbind(ysd);
 833                         *outkeylen = *outvallen = 0;
 834                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 835                         YPUNLOCK();
 836                         return (YPERR_RESRC);
 837                 }
 838                 bcopy(yprkv.val.valdat_val, *outval, *outvallen);
 839                 (*outval)[*outvallen] = '\0';
 840         }
 841
 842         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 843         YPUNLOCK();
 844         return (r);
 845 }
 846
 847 int
 848 yp_next(char *indomain, char *inmap, char *inkey, int inkeylen,
 849     char **outkey, int *outkeylen, char **outval, int *outvallen)
 850 {
 851         struct ypresp_key_val yprkv;
 852         struct ypreq_key yprk;
 853         struct dom_binding *ysd;
 854         struct timeval tv;
 855         int r;
 856         int retries = 0;
 857         /* Sanity check */
 858
 859         if (inkey == NULL || !strlen(inkey) || inkeylen <= 0 ||
 860             inmap == NULL || !strlen(inmap) ||
 861             indomain == NULL || !strlen(indomain))
 862                 return (YPERR_BADARGS);
 863
 864         *outkey = *outval = NULL;
 865         *outkeylen = *outvallen = 0;
 866
 867         YPLOCK();
 868 again:
 869         if (retries > MAX_RETRIES) {
 870                 YPUNLOCK();
 871                 return (YPERR_RPC);
 872         }
 873
 874         if (_yp_dobind(indomain, &ysd) != 0) {
 875                 YPUNLOCK();
 876                 return (YPERR_DOMAIN);
 877         }
 878
 879         tv.tv_sec = _yplib_timeout;
 880         tv.tv_usec = 0;
 881
 882         yprk.domain = indomain;
 883         yprk.map = inmap;
 884         yprk.key.keydat_val = inkey;
 885         yprk.key.keydat_len = inkeylen;
 886         bzero((char *)&yprkv, sizeof yprkv);
 887
 888         r = clnt_call(ysd->dom_client, YPPROC_NEXT,
 889                 (xdrproc_t)xdr_ypreq_key, &yprk,
 890                 (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
 891         if (r != RPC_SUCCESS) {
 892                 clnt_perror(ysd->dom_client, "yp_next: clnt_call");
 893                 _yp_unbind(ysd);
 894                 retries++;
 895                 goto again;
 896         }
 897         if (!(r = ypprot_err(yprkv.stat))) {
 898                 *outkeylen = yprkv.key.keydat_len;
 899                 *outkey = (char *)malloc(*outkeylen+1);
 900                 if (*outkey == NULL) {
 901                         _yp_unbind(ysd);
 902                         *outkeylen = 0;
 903                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 904                         YPUNLOCK();
 905                         return (YPERR_RESRC);
 906                 }
 907                 bcopy(yprkv.key.keydat_val, *outkey, *outkeylen);
 908                 (*outkey)[*outkeylen] = '\0';
 909                 *outvallen = yprkv.val.valdat_len;
 910                 *outval = (char *)malloc(*outvallen+1);
 911                 if (*outval == NULL) {
 912                         free(*outkey);
 913                         _yp_unbind(ysd);
 914                         *outkeylen = *outvallen = 0;
 915                         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 916                         YPUNLOCK();
 917                         return (YPERR_RESRC);
 918                 }
 919                 bcopy(yprkv.val.valdat_val, *outval, *outvallen);
 920                 (*outval)[*outvallen] = '\0';
 921         }
 922
 923         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 924         YPUNLOCK();
 925         return (r);
 926 }
 927
 928 int
 929 yp_all(char *indomain, char *inmap, struct ypall_callback *incallback)
 930 {
 931         struct ypreq_nokey yprnk;
 932         struct dom_binding *ysd;
 933         struct timeval tv;
 934         struct sockaddr_in clnt_sin;
 935         CLIENT *clnt;
 936         u_long status, savstat;
 937         int clnt_sock;
 938         int retries = 0;
 939         /* Sanity check */
 940
 941         if (indomain == NULL || !strlen(indomain) ||
 942             inmap == NULL || !strlen(inmap))
 943                 return (YPERR_BADARGS);
 944
 945         YPLOCK();
 946 again:
 947         if (retries > MAX_RETRIES) {
 948                 YPUNLOCK();
 949                 return (YPERR_RPC);
 950         }
 951
 952         if (_yp_dobind(indomain, &ysd) != 0) {
 953                 YPUNLOCK();
 954                 return (YPERR_DOMAIN);
 955         }
 956
 957         tv.tv_sec = _yplib_timeout;
 958         tv.tv_usec = 0;
 959
 960         /* YPPROC_ALL manufactures its own channel to ypserv using TCP */
 961
 962         clnt_sock = RPC_ANYSOCK;
 963         clnt_sin = ysd->dom_server_addr;
 964         clnt_sin.sin_port = 0;
 965         clnt = clnttcp_create(&clnt_sin, YPPROG, YPVERS, &clnt_sock, 0, 0);
 966         if (clnt == NULL) {
 967                 YPUNLOCK();
 968                 printf("clnttcp_create failed\n");
 969                 return (YPERR_PMAP);
 970         }
 971
 972         yprnk.domain = indomain;
 973         yprnk.map = inmap;
 974         ypresp_allfn = incallback->foreach;
 975         ypresp_data = (void *)incallback->data;
 976
 977         if (clnt_call(clnt, YPPROC_ALL,
 978                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 979                 (xdrproc_t)xdr_ypresp_all_seq, &status, tv) != RPC_SUCCESS) {
 980                         clnt_perror(clnt, "yp_all: clnt_call");
 981                         clnt_destroy(clnt);
 982                         _yp_unbind(ysd);
 983                         retries++;
 984                         goto again;
 985         }
 986
 987         clnt_destroy(clnt);
 988         savstat = status;
 989         xdr_free((xdrproc_t)xdr_ypresp_all_seq, &status);       /* not really needed... */
 990         YPUNLOCK();
 991         if (savstat != YP_NOMORE)
 992                 return (ypprot_err(savstat));
 993         return (0);
 994 }
 995
 996 int
 997 yp_order(char *indomain, char *inmap, int *outorder)
 998 {
 999         struct dom_binding *ysd;
1000         struct ypresp_order ypro;
1001         struct ypreq_nokey yprnk;
1002         struct timeval tv;
1003         int r;
1004
1005         /* Sanity check */
1006
1007         if (indomain == NULL || !strlen(indomain) ||
1008             inmap == NULL || !strlen(inmap))
1009                 return (YPERR_BADARGS);
1010
1011         YPLOCK();
1012 again:
1013         if (_yp_dobind(indomain, &ysd) != 0) {
1014                 YPUNLOCK();
1015                 return (YPERR_DOMAIN);
1016         }
1017
1018         tv.tv_sec = _yplib_timeout;
1019         tv.tv_usec = 0;
1020
1021         yprnk.domain = indomain;
1022         yprnk.map = inmap;
1023
1024         bzero((char *)(char *)&ypro, sizeof ypro);
1025
1026         r = clnt_call(ysd->dom_client, YPPROC_ORDER,
1027                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
1028                 (xdrproc_t)xdr_ypresp_order, &ypro, tv);
1029
1030         /*
1031          * NIS+ in YP compat mode doesn't support the YPPROC_ORDER
1032          * procedure.
1033          */
1034         if (r == RPC_PROCUNAVAIL) {
1035                 YPUNLOCK();
1036                 return(YPERR_YPERR);
1037         }
1038
1039         if (r != RPC_SUCCESS) {
1040                 clnt_perror(ysd->dom_client, "yp_order: clnt_call");
1041                 _yp_unbind(ysd);
1042                 goto again;
1043         }
1044
1045         if (!(r = ypprot_err(ypro.stat))) {
1046                 *outorder = ypro.ordernum;
1047         }
1048
1049         xdr_free((xdrproc_t)xdr_ypresp_order, &ypro);
1050         YPUNLOCK();
1051         return (r);
1052 }
1053
1054 int
1055 yp_master(char *indomain, char *inmap, char **outname)
1056 {
1057         struct dom_binding *ysd;
1058         struct ypresp_master yprm;
1059         struct ypreq_nokey yprnk;
1060         struct timeval tv;
1061         int r;
1062
1063         /* Sanity check */
1064
1065         if (indomain == NULL || !strlen(indomain) ||
1066             inmap == NULL || !strlen(inmap))
1067                 return (YPERR_BADARGS);
1068         YPLOCK();
1069 again:
1070         if (_yp_dobind(indomain, &ysd) != 0) {
1071                 YPUNLOCK();
1072                 return (YPERR_DOMAIN);
1073         }
1074
1075         tv.tv_sec = _yplib_timeout;
1076         tv.tv_usec = 0;
1077
1078         yprnk.domain = indomain;
1079         yprnk.map = inmap;
1080
1081         bzero((char *)&yprm, sizeof yprm);
1082
1083         r = clnt_call(ysd->dom_client, YPPROC_MASTER,
1084                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
1085                 (xdrproc_t)xdr_ypresp_master, &yprm, tv);
1086         if (r != RPC_SUCCESS) {
1087                 clnt_perror(ysd->dom_client, "yp_master: clnt_call");
1088                 _yp_unbind(ysd);
1089                 goto again;
1090         }
1091
1092         if (!(r = ypprot_err(yprm.stat))) {
1093                 *outname = (char *)strdup(yprm.peer);
1094         }
1095
1096         xdr_free((xdrproc_t)xdr_ypresp_master, &yprm);
1097         YPUNLOCK();
1098         return (r);
1099 }
1100
1101 int
1102 yp_maplist(char *indomain, struct ypmaplist **outmaplist)
1103 {
1104         struct dom_binding *ysd;
1105         struct ypresp_maplist ypml;
1106         struct timeval tv;
1107         int r;
1108
1109         /* Sanity check */
1110
1111         if (indomain == NULL || !strlen(indomain))
1112                 return (YPERR_BADARGS);
1113
1114         YPLOCK();
1115 again:
1116         if (_yp_dobind(indomain, &ysd) != 0) {
1117                 YPUNLOCK();
1118                 return (YPERR_DOMAIN);
1119         }
1120
1121         tv.tv_sec = _yplib_timeout;
1122         tv.tv_usec = 0;
1123
1124         bzero((char *)&ypml, sizeof ypml);
1125
1126         r = clnt_call(ysd->dom_client, YPPROC_MAPLIST,
1127                 (xdrproc_t)xdr_domainname, &indomain,
1128                 (xdrproc_t)xdr_ypresp_maplist, &ypml,tv);
1129         if (r != RPC_SUCCESS) {
1130                 clnt_perror(ysd->dom_client, "yp_maplist: clnt_call");
1131                 _yp_unbind(ysd);
1132                 goto again;
1133         }
1134         if (!(r = ypprot_err(ypml.stat))) {
1135                 *outmaplist = ypml.maps;
1136         }
1137
1138         /* NO: xdr_free((xdrproc_t)xdr_ypresp_maplist, &ypml);*/
1139         YPUNLOCK();
1140         return (r);
1141 }
1142
1143 const char *
1144 yperr_string(int incode)
1145 {
1146         static char err[80];
1147
1148         switch (incode) {
1149         case 0:
1150                 return ("Success");
1151         case YPERR_BADARGS:
1152                 return ("Request arguments bad");
1153         case YPERR_RPC:
1154                 return ("RPC failure");
1155         case YPERR_DOMAIN:
1156                 return ("Can't bind to server which serves this domain");
1157         case YPERR_MAP:
1158                 return ("No such map in server's domain");
1159         case YPERR_KEY:
1160                 return ("No such key in map");
1161         case YPERR_YPERR:
1162                 return ("YP server error");
1163         case YPERR_RESRC:
1164                 return ("Local resource allocation failure");
1165         case YPERR_NOMORE:
1166                 return ("No more records in map database");
1167         case YPERR_PMAP:
1168                 return ("Can't communicate with portmapper");
1169         case YPERR_YPBIND:
1170                 return ("Can't communicate with ypbind");
1171         case YPERR_YPSERV:
1172                 return ("Can't communicate with ypserv");
1173         case YPERR_NODOM:
1174                 return ("Local domain name not set");
1175         case YPERR_BADDB:
1176                 return ("Server data base is bad");
1177         case YPERR_VERS:
1178                 return ("YP server version mismatch - server can't supply service.");
1179         case YPERR_ACCESS:
1180                 return ("Access violation");
1181         case YPERR_BUSY:
1182                 return ("Database is busy");
1183         }
1184         sprintf(err, "YP unknown error %d\n", incode);
1185         return (err);
1186 }
1187
1188 int
1189 ypprot_err(unsigned int incode)
1190 {
1191         switch (incode) {
1192         case YP_TRUE:
1193                 return (0);
1194         case YP_FALSE:
1195                 return (YPERR_YPBIND);
1196         case YP_NOMORE:
1197                 return (YPERR_NOMORE);
1198         case YP_NOMAP:
1199                 return (YPERR_MAP);
1200         case YP_NODOM:
1201                 return (YPERR_DOMAIN);
1202         case YP_NOKEY:
1203                 return (YPERR_KEY);
1204         case YP_BADOP:
1205                 return (YPERR_YPERR);
1206         case YP_BADDB:
1207                 return (YPERR_BADDB);
1208         case YP_YPERR:
1209                 return (YPERR_YPERR);
1210         case YP_BADARGS:
1211                 return (YPERR_BADARGS);
1212         case YP_VERS:
1213                 return (YPERR_VERS);
1214         }
1215         return (YPERR_YPERR);
1216 }
1217
1218 int
1219 _yp_check(char **dom)
1220 {
1221         char *unused;
1222
1223         YPLOCK();
1224         if (_yp_domain[0]=='\0')
1225                 if (yp_get_default_domain_locked(&unused)) {
1226                         YPUNLOCK();
1227                         return (0);
1228                 }
1229
1230         if (dom)
1231                 *dom = _yp_domain;
1232
1233         if (yp_bind_locked(_yp_domain) == 0) {
1234                 yp_unbind_locked(_yp_domain);
1235                 YPUNLOCK();
1236                 return (1);
1237         }
1238         YPUNLOCK();
1239         return (0);
1240 }