lib/libc/yp/yplib.c

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