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  * $FreeBSD: src/lib/libc/yp/yplib.c,v 1.51 2007/07/24 13:06:08 simon Exp $
  31  */
  32
  33 #include "namespace.h"
  34 #include "reentrant.h"
  35 #include <sys/param.h>
  36 #include <sys/types.h>
  37 #include <sys/socket.h>
  38 #include <sys/uio.h>
  39 #include <arpa/inet.h>
  40 #include <errno.h>
  41 #include <fcntl.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 bool_t  xdr_ypresp_all_seq(XDR *, u_long *);
  53
  54 int (*ypresp_allfn)(unsigned long, char *, int, char *, int, void *);
  55
  56 /*
  57  * We have to define these here due to clashes between yp_prot.h and
  58  * yp.h.
  59  */
  60
  61 #define YPMATCHCACHE
  62
  63 #ifdef YPMATCHCACHE
  64 struct ypmatch_ent {
  65         char                    *ypc_map;
  66         keydat                  ypc_key;
  67         valdat                  ypc_val;
  68         time_t                  ypc_expire_t;
  69         struct ypmatch_ent      *ypc_next;
  70 };
  71 #define YPLIB_MAXCACHE  5       /* At most 5 entries */
  72 #define YPLIB_EXPIRE    5       /* Expire after 5 seconds */
  73 #endif
  74
  75 struct dom_binding {
  76         struct dom_binding *dom_pnext;
  77         char dom_domain[YPMAXDOMAIN + 1];
  78         struct sockaddr_in dom_server_addr;
  79         u_short dom_server_port;
  80         int dom_socket;
  81         CLIENT *dom_client;
  82         u_short dom_local_port; /* now I finally know what this is for. */
  83         long dom_vers;
  84 #ifdef YPMATCHCACHE
  85         struct ypmatch_ent *cache;
  86         int ypmatch_cachecnt;
  87 #endif
  88 };
  89
  90 #include <rpcsvc/yp.h>
  91 #include <rpcsvc/ypclnt.h>
  92
  93 #ifndef BINDINGDIR
  94 #define BINDINGDIR "/var/yp/binding"
  95 #endif
  96 #define MAX_RETRIES 20
  97
  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 = ypdb->cache;
 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 char *
 266 ypbinderr_string(int incode)
 267 {
 268         const char *errstr;
 269         static char err[80];
 270         switch (incode) {
 271         case 0:
 272                 errstr = "Success";
 273                 break;
 274         case YPBIND_ERR_ERR:
 275                 errstr = "Internal ypbind error";
 276                 break;
 277         case YPBIND_ERR_NOSERV:
 278                 errstr = "Domain not bound";
 279                 break;
 280         case YPBIND_ERR_RESC:
 281                 errstr = "System resource allocation failure";
 282                 break;
 283         default:
 284                 errstr = NULL;
 285                 break;
 286         }
 287         if (errstr != NULL)
 288                 strlcpy(err, errstr, sizeof(err));
 289         else
 290                 snprintf(err, sizeof(err), "Unknown ypbind error: #%d\n", incode);
 291         return (err);
 292 }
 293
 294 int
 295 _yp_dobind(const char *dom, struct dom_binding **ypdb)
 296 {
 297         static pid_t pid = -1;
 298         char path[MAXPATHLEN];
 299         struct dom_binding *ysd, *ysd2;
 300         struct ypbind_resp ypbr;
 301         struct timeval tv;
 302         struct sockaddr_in clnt_sin;
 303         int clnt_sock, fd;
 304         pid_t gpid;
 305         CLIENT *client;
 306         int new = 0;
 307         ssize_t r;
 308         int retries = 0;
 309         struct sockaddr_in check;
 310         socklen_t checklen = sizeof(struct sockaddr_in);
 311
 312         /* Not allowed; bad doggie. Bad. */
 313         if (strchr(dom, '/') != NULL)
 314                 return(YPERR_BADARGS);
 315
 316         gpid = getpid();
 317         if (!(pid == -1 || pid == gpid)) {
 318                 ysd = _ypbindlist;
 319                 while (ysd) {
 320                         if (ysd->dom_client != NULL)
 321                                 _yp_unbind(ysd);
 322                         ysd2 = ysd->dom_pnext;
 323                         free(ysd);
 324                         ysd = ysd2;
 325                 }
 326                 _ypbindlist = NULL;
 327         }
 328         pid = gpid;
 329
 330         if (ypdb != NULL)
 331                 *ypdb = NULL;
 332
 333         if (dom == NULL || strlen(dom) == 0)
 334                 return (YPERR_BADARGS);
 335
 336         for (ysd = _ypbindlist; ysd; ysd = ysd->dom_pnext)
 337                 if (strcmp(dom, ysd->dom_domain) == 0)
 338                         break;
 339
 340
 341         if (ysd == NULL) {
 342                 ysd = (struct dom_binding *)malloc(sizeof *ysd);
 343                 bzero((char *)ysd, sizeof *ysd);
 344                 ysd->dom_socket = -1;
 345                 ysd->dom_vers = 0;
 346                 new = 1;
 347         } else {
 348         /* Check the socket -- may have been hosed by the caller. */
 349                 if (_getsockname(ysd->dom_socket, (struct sockaddr *)&check,
 350                     &checklen) == -1 || check.sin_family != AF_INET ||
 351                     check.sin_port != ysd->dom_local_port) {
 352                 /* Socket became bogus somehow... need to rebind. */
 353                         int save, sock;
 354
 355                         sock = ysd->dom_socket;
 356                         save = _dup(ysd->dom_socket);
 357                         if (ysd->dom_client != NULL)
 358                                 clnt_destroy(ysd->dom_client);
 359                         ysd->dom_vers = 0;
 360                         ysd->dom_client = NULL;
 361                         sock = _dup2(save, sock);
 362                         _close(save);
 363                 }
 364         }
 365
 366 again:
 367         retries++;
 368         if (retries > MAX_RETRIES) {
 369                 if (new)
 370                         free(ysd);
 371                 return(YPERR_YPBIND);
 372         }
 373 #ifdef BINDINGDIR
 374         if (ysd->dom_vers == 0) {
 375                 /*
 376                  * We're trying to make a new binding: zorch the
 377                  * existing handle now (if any).
 378                  */
 379                 if (ysd->dom_client != NULL) {
 380                         clnt_destroy(ysd->dom_client);
 381                         ysd->dom_client = NULL;
 382                         ysd->dom_socket = -1;
 383                 }
 384                 snprintf(path, sizeof(path), "%s/%s.%d", BINDINGDIR, dom, 2);
 385                 if ((fd = _open(path, O_RDONLY | O_CLOEXEC)) == -1) {
 386                         /* no binding file, YP is dead. */
 387                         /* Try to bring it back to life. */
 388                         _close(fd);
 389                         goto skipit;
 390                 }
 391                 if (_flock(fd, LOCK_EX|LOCK_NB) == -1 && errno == EWOULDBLOCK) {
 392                         struct iovec iov[2];
 393                         struct ypbind_resp ybr;
 394                         u_short ypb_port;
 395
 396                         iov[0].iov_base = (caddr_t)&ypb_port;
 397                         iov[0].iov_len = sizeof ypb_port;
 398                         iov[1].iov_base = (caddr_t)&ybr;
 399                         iov[1].iov_len = sizeof ybr;
 400
 401                         r = _readv(fd, iov, 2);
 402                         if (r != (ssize_t)(iov[0].iov_len + iov[1].iov_len)) {
 403                                 _close(fd);
 404                                 ysd->dom_vers = -1;
 405                                 goto again;
 406                         }
 407
 408                         bzero(&ysd->dom_server_addr, sizeof ysd->dom_server_addr);
 409                         ysd->dom_server_addr.sin_family = AF_INET;
 410                         ysd->dom_server_addr.sin_len = sizeof(struct sockaddr_in);
 411                         bcopy(&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr,
 412                             &ysd->dom_server_addr.sin_addr.s_addr,
 413                             sizeof(ysd->dom_server_addr.sin_addr.s_addr));
 414                         bcopy(&ybr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port,
 415                             &ysd->dom_server_addr.sin_port,
 416                             sizeof(ysd->dom_server_addr.sin_port));
 417
 418                         ysd->dom_server_port = ysd->dom_server_addr.sin_port;
 419                         _close(fd);
 420                         goto gotit;
 421                 } else {
 422                         /* no lock on binding file, YP is dead. */
 423                         /* Try to bring it back to life. */
 424                         _close(fd);
 425                         goto skipit;
 426                 }
 427         }
 428 skipit:
 429 #endif
 430         if (ysd->dom_vers == -1 || ysd->dom_vers == 0) {
 431                 /*
 432                  * We're trying to make a new binding: zorch the
 433                  * existing handle now (if any).
 434                  */
 435                 if (ysd->dom_client != NULL) {
 436                         clnt_destroy(ysd->dom_client);
 437                         ysd->dom_client = NULL;
 438                         ysd->dom_socket = -1;
 439                 }
 440                 bzero((char *)&clnt_sin, sizeof clnt_sin);
 441                 clnt_sin.sin_family = AF_INET;
 442                 clnt_sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 443
 444                 clnt_sock = RPC_ANYSOCK;
 445                 client = clnttcp_create(&clnt_sin, YPBINDPROG, YPBINDVERS, &clnt_sock,
 446                         0, 0);
 447                 if (client == NULL) {
 448                         /*
 449                          * These conditions indicate ypbind just isn't
 450                          * alive -- we probably don't want to shoot our
 451                          * mouth off in this case; instead generate error
 452                          * messages only for really exotic problems.
 453                          */
 454                         if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED &&
 455                            (rpc_createerr.cf_stat != RPC_SYSTEMERROR &&
 456                            rpc_createerr.cf_error.re_errno == ECONNREFUSED))
 457                                 clnt_pcreateerror("clnttcp_create");
 458                         if (new)
 459                                 free(ysd);
 460                         return (YPERR_YPBIND);
 461                 }
 462
 463                 /*
 464                  * Check the port number -- should be < IPPORT_RESERVED.
 465                  * If not, it's possible someone has registered a bogus
 466                  * ypbind with the portmapper and is trying to trick us.
 467                  */
 468                 if (ntohs(clnt_sin.sin_port) >= IPPORT_RESERVED) {
 469                         if (client != NULL)
 470                                 clnt_destroy(client);
 471                         if (new)
 472                                 free(ysd);
 473                         return(YPERR_YPBIND);
 474                 }
 475                 tv.tv_sec = _yplib_timeout/2;
 476                 tv.tv_usec = 0;
 477                 r = clnt_call(client, YPBINDPROC_DOMAIN,
 478                     (xdrproc_t)xdr_domainname, &dom,
 479                     (xdrproc_t)xdr_ypbind_resp, &ypbr, tv);
 480                 if (r != RPC_SUCCESS) {
 481                         clnt_destroy(client);
 482                         ysd->dom_vers = -1;
 483                         if (r == RPC_PROGUNAVAIL || r == RPC_PROCUNAVAIL) {
 484                                 if (new)
 485                                         free(ysd);
 486                                 return(YPERR_YPBIND);
 487                         }
 488                         fprintf(stderr,
 489                         "YP: server for domain %s not responding, retrying\n", dom);
 490                         goto again;
 491                 } else {
 492                         if (ypbr.ypbind_status != YPBIND_SUCC_VAL) {
 493                                 struct timespec time_to_sleep, time_remaining;
 494
 495                                 clnt_destroy(client);
 496                                 ysd->dom_vers = -1;
 497
 498                                 time_to_sleep.tv_sec = _yplib_timeout/2;
 499                                 time_to_sleep.tv_nsec = 0;
 500                                 _nanosleep(&time_to_sleep,
 501                                     &time_remaining);
 502                                 goto again;
 503                         }
 504                 }
 505                 clnt_destroy(client);
 506
 507                 bzero((char *)&ysd->dom_server_addr, sizeof ysd->dom_server_addr);
 508                 ysd->dom_server_addr.sin_family = AF_INET;
 509                 bcopy(&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port,
 510                     &ysd->dom_server_addr.sin_port,
 511                     sizeof(ysd->dom_server_addr.sin_port));
 512                 bcopy(&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr,
 513                     &ysd->dom_server_addr.sin_addr.s_addr,
 514                     sizeof(ysd->dom_server_addr.sin_addr.s_addr));
 515
 516                 /*
 517                  * We could do a reserved port check here too, but this
 518                  * could pose compatibility problems. The local ypbind is
 519                  * supposed to decide whether or not to trust yp servers
 520                  * on insecure ports. For now, we trust its judgement.
 521                  */
 522                 ysd->dom_server_port =
 523                         *(u_short *)&ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_port;
 524 gotit:
 525                 ysd->dom_vers = YPVERS;
 526                 strlcpy(ysd->dom_domain, dom, sizeof(ysd->dom_domain));
 527         }
 528
 529         /* Don't rebuild the connection to the server unless we have to. */
 530         if (ysd->dom_client == NULL) {
 531                 tv.tv_sec = _yplib_timeout/2;
 532                 tv.tv_usec = 0;
 533                 ysd->dom_socket = RPC_ANYSOCK;
 534                 ysd->dom_client = clntudp_bufcreate(&ysd->dom_server_addr,
 535                         YPPROG, YPVERS, tv, &ysd->dom_socket, 1280, 2304);
 536                 if (ysd->dom_client == NULL) {
 537                         clnt_pcreateerror("clntudp_create");
 538                         ysd->dom_vers = -1;
 539                         goto again;
 540                 }
 541                 if (_fcntl(ysd->dom_socket, F_SETFD, 1) == -1)
 542                         perror("fcntl: F_SETFD");
 543                 /*
 544                  * We want a port number associated with this socket
 545                  * so that we can check its authenticity later.
 546                  */
 547                 checklen = sizeof(struct sockaddr_in);
 548                 bzero((char *)&check, checklen);
 549                 _bind(ysd->dom_socket, (struct sockaddr *)&check, checklen);
 550                 check.sin_family = AF_INET;
 551                 if (!_getsockname(ysd->dom_socket,
 552                     (struct sockaddr *)&check, &checklen)) {
 553                         ysd->dom_local_port = check.sin_port;
 554                 } else {
 555                         clnt_destroy(ysd->dom_client);
 556                         if (new)
 557                                 free(ysd);
 558                         return(YPERR_YPBIND);
 559                 }
 560         }
 561
 562         if (new) {
 563                 ysd->dom_pnext = _ypbindlist;
 564                 _ypbindlist = ysd;
 565         }
 566
 567         /*
 568          * Set low retry timeout to realistically handle UDP packet
 569          * loss for YP packet bursts.
 570          */
 571         tv.tv_sec = 1;
 572         tv.tv_usec = 0;
 573         clnt_control(ysd->dom_client, CLSET_RETRY_TIMEOUT, (char*)&tv);
 574
 575         if (ypdb != NULL)
 576                 *ypdb = ysd;
 577         return (0);
 578 }
 579
 580 static void
 581 _yp_unbind(struct dom_binding *ypb)
 582 {
 583         struct sockaddr_in check;
 584         socklen_t checklen = sizeof(struct sockaddr_in);
 585
 586         if (ypb->dom_client != NULL) {
 587                 /* Check the socket -- may have been hosed by the caller. */
 588                 if (_getsockname(ypb->dom_socket, (struct sockaddr *)&check,
 589                 &checklen) == -1 || check.sin_family != AF_INET ||
 590                 check.sin_port != ypb->dom_local_port) {
 591                         int save, sock;
 592
 593                         sock = ypb->dom_socket;
 594                         save = _dup(ypb->dom_socket);
 595                         clnt_destroy(ypb->dom_client);
 596                         sock = _dup2(save, sock);
 597                         _close(save);
 598                 } else
 599                         clnt_destroy(ypb->dom_client);
 600         }
 601
 602         ypb->dom_client = NULL;
 603         ypb->dom_socket = -1;
 604         ypb->dom_vers = -1;
 605 #ifdef YPMATCHCACHE
 606         ypmatch_cache_flush(ypb);
 607 #endif
 608 }
 609
 610 static int
 611 yp_bind_locked(char *dom)
 612 {
 613         return (_yp_dobind(dom, NULL));
 614 }
 615
 616 int
 617 yp_bind(char *dom)
 618 {
 619         int r;
 620
 621         YPLOCK();
 622         r = yp_bind_locked(dom);
 623         YPUNLOCK();
 624         return (r);
 625 }
 626
 627 static void
 628 yp_unbind_locked(char *dom)
 629 {
 630         struct dom_binding *ypb, *ypbp;
 631
 632         ypbp = NULL;
 633         for (ypb = _ypbindlist; ypb; ypb = ypb->dom_pnext) {
 634                 if (strcmp(dom, ypb->dom_domain) == 0) {
 635                         _yp_unbind(ypb);
 636                         if (ypbp)
 637                                 ypbp->dom_pnext = ypb->dom_pnext;
 638                         else
 639                                 _ypbindlist = ypb->dom_pnext;
 640                         free(ypb);
 641                         return;
 642                 }
 643                 ypbp = ypb;
 644         }
 645         return;
 646 }
 647
 648 void
 649 yp_unbind(char *dom)
 650 {
 651         YPLOCK();
 652         yp_unbind_locked(dom);
 653         YPUNLOCK();
 654 }
 655
 656 int
 657 yp_match(char *indomain, char *inmap, const char *inkey, int inkeylen,
 658     char **outval, int *outvallen)
 659 {
 660         struct dom_binding *ysd;
 661         struct ypresp_val yprv;
 662         struct timeval tv;
 663         struct ypreq_key yprk;
 664         int r;
 665
 666         *outval = NULL;
 667         *outvallen = 0;
 668
 669         /* Sanity check */
 670
 671         if (inkey == NULL || !strlen(inkey) || inkeylen <= 0 ||
 672             inmap == NULL || !strlen(inmap) ||
 673             indomain == NULL || !strlen(indomain))
 674                 return (YPERR_BADARGS);
 675
 676         YPLOCK();
 677         if (_yp_dobind(indomain, &ysd) != 0) {
 678                 YPUNLOCK();
 679                 return(YPERR_DOMAIN);
 680         }
 681
 682         yprk.domain = indomain;
 683         yprk.map = inmap;
 684         yprk.key.keydat_val = (char *)inkey;
 685         yprk.key.keydat_len = inkeylen;
 686
 687 #ifdef YPMATCHCACHE
 688         if (ypmatch_cache_lookup(ysd, yprk.map, &yprk.key, &yprv.val) == TRUE) {
 689 /*
 690         if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
 691             inkeylen, &yprv.val.valdat_val, &yprv.val.valdat_len)) {
 692 */
 693                 *outvallen = yprv.val.valdat_len;
 694                 *outval = (char *)malloc(*outvallen+1);
 695                 bcopy(yprv.val.valdat_val, *outval, *outvallen);
 696                 (*outval)[*outvallen] = '\0';
 697                 YPUNLOCK();
 698                 return (0);
 699         }
 700 #endif
 701
 702 again:
 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                 goto again;
 720         }
 721
 722         if (!(r = ypprot_err(yprv.stat))) {
 723                 *outvallen = yprv.val.valdat_len;
 724                 *outval = (char *)malloc(*outvallen+1);
 725                 bcopy(yprv.val.valdat_val, *outval, *outvallen);
 726                 (*outval)[*outvallen] = '\0';
 727 #ifdef YPMATCHCACHE
 728                 ypmatch_cache_insert(ysd, yprk.map, &yprk.key, &yprv.val);
 729 #endif
 730         }
 731
 732         xdr_free((xdrproc_t)xdr_ypresp_val, &yprv);
 733         YPUNLOCK();
 734         return (r);
 735 }
 736
 737 static int
 738 yp_get_default_domain_locked(char **domp)
 739 {
 740         *domp = NULL;
 741         if (_yp_domain[0] == '\0')
 742                 if (getdomainname(_yp_domain, sizeof _yp_domain))
 743                         return (YPERR_NODOM);
 744         *domp = _yp_domain;
 745         return (0);
 746 }
 747
 748 int
 749 yp_get_default_domain(char **domp)
 750 {
 751         int r;
 752
 753         YPLOCK();
 754         r = yp_get_default_domain_locked(domp);
 755         YPUNLOCK();
 756         return (r);
 757 }
 758
 759 int
 760 yp_first(char *indomain, char *inmap, char **outkey, int *outkeylen,
 761     char **outval, int *outvallen)
 762 {
 763         struct ypresp_key_val yprkv;
 764         struct ypreq_nokey yprnk;
 765         struct dom_binding *ysd;
 766         struct timeval tv;
 767         int r;
 768
 769         /* Sanity check */
 770
 771         if (indomain == NULL || !strlen(indomain) ||
 772             inmap == NULL || !strlen(inmap))
 773                 return (YPERR_BADARGS);
 774
 775         *outkey = *outval = NULL;
 776         *outkeylen = *outvallen = 0;
 777
 778         YPLOCK();
 779 again:
 780         if (_yp_dobind(indomain, &ysd) != 0) {
 781                 YPUNLOCK();
 782                 return (YPERR_DOMAIN);
 783         }
 784
 785         tv.tv_sec = _yplib_timeout;
 786         tv.tv_usec = 0;
 787
 788         yprnk.domain = indomain;
 789         yprnk.map = inmap;
 790         bzero((char *)&yprkv, sizeof yprkv);
 791
 792         r = clnt_call(ysd->dom_client, YPPROC_FIRST,
 793             (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 794             (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
 795         if (r != RPC_SUCCESS) {
 796                 clnt_perror(ysd->dom_client, "yp_first: clnt_call");
 797                 _yp_unbind(ysd);
 798                 goto again;
 799         }
 800         if (!(r = ypprot_err(yprkv.stat))) {
 801                 *outkeylen = yprkv.key.keydat_len;
 802                 *outkey = (char *)malloc(*outkeylen+1);
 803                 bcopy(yprkv.key.keydat_val, *outkey, *outkeylen);
 804                 (*outkey)[*outkeylen] = '\0';
 805                 *outvallen = yprkv.val.valdat_len;
 806                 *outval = (char *)malloc(*outvallen+1);
 807                 bcopy(yprkv.val.valdat_val, *outval, *outvallen);
 808                 (*outval)[*outvallen] = '\0';
 809         }
 810
 811         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 812         YPUNLOCK();
 813         return (r);
 814 }
 815
 816 int
 817 yp_next(char *indomain, char *inmap, char *inkey, int inkeylen,
 818     char **outkey, int *outkeylen, char **outval, int *outvallen)
 819 {
 820         struct ypresp_key_val yprkv;
 821         struct ypreq_key yprk;
 822         struct dom_binding *ysd;
 823         struct timeval tv;
 824         int r;
 825
 826         /* Sanity check */
 827
 828         if (inkey == NULL || !strlen(inkey) || inkeylen <= 0 ||
 829             inmap == NULL || !strlen(inmap) ||
 830             indomain == NULL || !strlen(indomain))
 831                 return (YPERR_BADARGS);
 832
 833         *outkey = *outval = NULL;
 834         *outkeylen = *outvallen = 0;
 835
 836         YPLOCK();
 837 again:
 838         if (_yp_dobind(indomain, &ysd) != 0) {
 839                 YPUNLOCK();
 840                 return (YPERR_DOMAIN);
 841         }
 842
 843         tv.tv_sec = _yplib_timeout;
 844         tv.tv_usec = 0;
 845
 846         yprk.domain = indomain;
 847         yprk.map = inmap;
 848         yprk.key.keydat_val = inkey;
 849         yprk.key.keydat_len = inkeylen;
 850         bzero((char *)&yprkv, sizeof yprkv);
 851
 852         r = clnt_call(ysd->dom_client, YPPROC_NEXT,
 853             (xdrproc_t)xdr_ypreq_key, &yprk,
 854             (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
 855         if (r != RPC_SUCCESS) {
 856                 clnt_perror(ysd->dom_client, "yp_next: clnt_call");
 857                 _yp_unbind(ysd);
 858                 goto again;
 859         }
 860         if (!(r = ypprot_err(yprkv.stat))) {
 861                 *outkeylen = yprkv.key.keydat_len;
 862                 *outkey = (char *)malloc(*outkeylen+1);
 863                 bcopy(yprkv.key.keydat_val, *outkey, *outkeylen);
 864                 (*outkey)[*outkeylen] = '\0';
 865                 *outvallen = yprkv.val.valdat_len;
 866                 *outval = (char *)malloc(*outvallen+1);
 867                 bcopy(yprkv.val.valdat_val, *outval, *outvallen);
 868                 (*outval)[*outvallen] = '\0';
 869         }
 870
 871         xdr_free((xdrproc_t)xdr_ypresp_key_val, &yprkv);
 872         YPUNLOCK();
 873         return (r);
 874 }
 875
 876 int
 877 yp_all(char *indomain, char *inmap, struct ypall_callback *incallback)
 878 {
 879         struct ypreq_nokey yprnk;
 880         struct dom_binding *ysd;
 881         struct timeval tv;
 882         struct sockaddr_in clnt_sin;
 883         CLIENT *clnt;
 884         u_long status, savstat;
 885         int clnt_sock;
 886
 887         /* Sanity check */
 888
 889         if (indomain == NULL || !strlen(indomain) ||
 890             inmap == NULL || !strlen(inmap))
 891                 return (YPERR_BADARGS);
 892
 893         YPLOCK();
 894 again:
 895
 896         if (_yp_dobind(indomain, &ysd) != 0) {
 897                 YPUNLOCK();
 898                 return (YPERR_DOMAIN);
 899         }
 900
 901         tv.tv_sec = _yplib_timeout;
 902         tv.tv_usec = 0;
 903
 904         /* YPPROC_ALL manufactures its own channel to ypserv using TCP */
 905
 906         clnt_sock = RPC_ANYSOCK;
 907         clnt_sin = ysd->dom_server_addr;
 908         clnt_sin.sin_port = 0;
 909         clnt = clnttcp_create(&clnt_sin, YPPROG, YPVERS, &clnt_sock, 0, 0);
 910         if (clnt == NULL) {
 911                 YPUNLOCK();
 912                 printf("clnttcp_create failed\n");
 913                 return (YPERR_PMAP);
 914         }
 915
 916         yprnk.domain = indomain;
 917         yprnk.map = inmap;
 918         ypresp_allfn = incallback->foreach;
 919         ypresp_data = (void *)incallback->data;
 920
 921         if (clnt_call(clnt, YPPROC_ALL,
 922                 (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 923                 (xdrproc_t)xdr_ypresp_all_seq, &status, tv) != RPC_SUCCESS) {
 924                         clnt_perror(ysd->dom_client, "yp_all: clnt_call");
 925                         clnt_destroy(clnt);
 926                         _yp_unbind(ysd);
 927                         goto again;
 928         }
 929
 930         clnt_destroy(clnt);
 931         savstat = status;
 932         xdr_free((xdrproc_t)xdr_ypresp_all_seq, &status);       /* not really needed... */
 933         YPUNLOCK();
 934         if (savstat != YP_NOMORE)
 935                 return (ypprot_err(savstat));
 936         return (0);
 937 }
 938
 939 int
 940 yp_order(char *indomain, char *inmap, int *outorder)
 941 {
 942         struct dom_binding *ysd;
 943         struct ypresp_order ypro;
 944         struct ypreq_nokey yprnk;
 945         struct timeval tv;
 946         int r;
 947
 948         /* Sanity check */
 949
 950         if (indomain == NULL || !strlen(indomain) ||
 951             inmap == NULL || !strlen(inmap))
 952                 return (YPERR_BADARGS);
 953
 954         YPLOCK();
 955 again:
 956         if (_yp_dobind(indomain, &ysd) != 0) {
 957                 YPUNLOCK();
 958                 return (YPERR_DOMAIN);
 959         }
 960
 961         tv.tv_sec = _yplib_timeout;
 962         tv.tv_usec = 0;
 963
 964         yprnk.domain = indomain;
 965         yprnk.map = inmap;
 966
 967         bzero((char *)(char *)&ypro, sizeof ypro);
 968
 969         r = clnt_call(ysd->dom_client, YPPROC_ORDER,
 970             (xdrproc_t)xdr_ypreq_nokey, &yprnk,
 971             (xdrproc_t)xdr_ypresp_order, &ypro, tv);
 972
 973         /*
 974          * NIS+ in YP compat mode doesn't support the YPPROC_ORDER
 975          * procedure.
 976          */
 977         if (r == RPC_PROCUNAVAIL) {
 978                 YPUNLOCK();
 979                 return(YPERR_YPERR);
 980         }
 981
 982         if (r != RPC_SUCCESS) {
 983                 clnt_perror(ysd->dom_client, "yp_order: clnt_call");
 984                 _yp_unbind(ysd);
 985                 goto again;
 986         }
 987
 988         if (!(r = ypprot_err(ypro.stat))) {
 989                 *outorder = ypro.ordernum;
 990         }
 991
 992         xdr_free((xdrproc_t)xdr_ypresp_order, &ypro);
 993         YPUNLOCK();
 994         return (r);
 995 }
 996
 997 int
 998 yp_master(char *indomain, char *inmap, char **outname)
 999 {
1000         struct dom_binding *ysd;
1001         struct ypresp_master yprm;
1002         struct ypreq_nokey yprnk;
1003         struct timeval tv;
1004         int r;
1005
1006         /* Sanity check */
1007
1008         if (indomain == NULL || !strlen(indomain) ||
1009             inmap == NULL || !strlen(inmap))
1010                 return (YPERR_BADARGS);
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 *)&yprm, sizeof yprm);
1025
1026         r = clnt_call(ysd->dom_client, YPPROC_MASTER,
1027             (xdrproc_t)xdr_ypreq_nokey, &yprnk,
1028             (xdrproc_t)xdr_ypresp_master, &yprm, tv);
1029         if (r != RPC_SUCCESS) {
1030                 clnt_perror(ysd->dom_client, "yp_master: clnt_call");
1031                 _yp_unbind(ysd);
1032                 goto again;
1033         }
1034
1035         if (!(r = ypprot_err(yprm.stat))) {
1036                 *outname = (char *)strdup(yprm.peer);
1037         }
1038
1039         xdr_free((xdrproc_t)xdr_ypresp_master, &yprm);
1040         YPUNLOCK();
1041         return (r);
1042 }
1043
1044 int
1045 yp_maplist(char *indomain, struct ypmaplist **outmaplist)
1046 {
1047         struct dom_binding *ysd;
1048         struct ypresp_maplist ypml;
1049         struct timeval tv;
1050         int r;
1051
1052         /* Sanity check */
1053
1054         if (indomain == NULL || !strlen(indomain))
1055                 return (YPERR_BADARGS);
1056
1057         YPLOCK();
1058 again:
1059         if (_yp_dobind(indomain, &ysd) != 0) {
1060                 YPUNLOCK();
1061                 return (YPERR_DOMAIN);
1062         }
1063
1064         tv.tv_sec = _yplib_timeout;
1065         tv.tv_usec = 0;
1066
1067         bzero((char *)&ypml, sizeof ypml);
1068
1069         r = clnt_call(ysd->dom_client, YPPROC_MAPLIST,
1070             (xdrproc_t)xdr_domainname, &indomain,
1071             (xdrproc_t)xdr_ypresp_maplist, &ypml, tv);
1072         if (r != RPC_SUCCESS) {
1073                 clnt_perror(ysd->dom_client, "yp_maplist: clnt_call");
1074                 _yp_unbind(ysd);
1075                 goto again;
1076         }
1077         if (!(r = ypprot_err(ypml.stat))) {
1078                 *outmaplist = ypml.maps;
1079         }
1080
1081         /* NO: xdr_free((xdrproc_t)xdr_ypresp_maplist, &ypml);*/
1082         YPUNLOCK();
1083         return (r);
1084 }
1085
1086 char *
1087 yperr_string(int incode)
1088 {
1089         const char *errstr;
1090         static char err[80];
1091
1092         switch (incode) {
1093         case 0:
1094                 errstr = "Success";
1095                 break;
1096         case YPERR_BADARGS:
1097                 errstr = "Request arguments bad";
1098                 break;
1099         case YPERR_RPC:
1100                 errstr = "RPC failure";
1101                 break;
1102         case YPERR_DOMAIN:
1103                 errstr = "Can't bind to server which serves this domain";
1104                 break;
1105         case YPERR_MAP:
1106                 errstr = "No such map in server's domain";
1107                 break;
1108         case YPERR_KEY:
1109                 errstr = "No such key in map";
1110                 break;
1111         case YPERR_YPERR:
1112                 errstr = "YP server error";
1113                 break;
1114         case YPERR_RESRC:
1115                 errstr = "Local resource allocation failure";
1116                 break;
1117         case YPERR_NOMORE:
1118                 errstr = "No more records in map database";
1119                 break;
1120         case YPERR_PMAP:
1121                 errstr = "Can't communicate with portmapper";
1122                 break;
1123         case YPERR_YPBIND:
1124                 errstr = "Can't communicate with ypbind";
1125                 break;
1126         case YPERR_YPSERV:
1127                 errstr = "Can't communicate with ypserv";
1128                 break;
1129         case YPERR_NODOM:
1130                 errstr = "Local domain name not set";
1131                 break;
1132         case YPERR_BADDB:
1133                 errstr = "Server data base is bad";
1134                 break;
1135         case YPERR_VERS:
1136                 errstr = "YP server version mismatch - server can't supply service.";
1137                 break;
1138         case YPERR_ACCESS:
1139                 errstr = "Access violation";
1140                 break;
1141         case YPERR_BUSY:
1142                 errstr = "Database is busy";
1143                 break;
1144         default:
1145                 errstr = NULL;
1146                 break;
1147         }
1148         if (errstr != NULL)
1149                 strlcpy(err, errstr, sizeof(err));
1150         else
1151                 snprintf(err, sizeof(err), "YP unknown error %d\n", incode);
1152         return (err);
1153 }
1154
1155 int
1156 ypprot_err(unsigned int incode)
1157 {
1158         switch (incode) {
1159         case YP_TRUE:
1160                 return (0);
1161         case YP_FALSE:
1162                 return (YPERR_YPBIND);
1163         case YP_NOMORE:
1164                 return (YPERR_NOMORE);
1165         case YP_NOMAP:
1166                 return (YPERR_MAP);
1167         case YP_NODOM:
1168                 return (YPERR_DOMAIN);
1169         case YP_NOKEY:
1170                 return (YPERR_KEY);
1171         case YP_BADOP:
1172                 return (YPERR_YPERR);
1173         case YP_BADDB:
1174                 return (YPERR_BADDB);
1175         case YP_YPERR:
1176                 return (YPERR_YPERR);
1177         case YP_BADARGS:
1178                 return (YPERR_BADARGS);
1179         case YP_VERS:
1180                 return (YPERR_VERS);
1181         }
1182         return (YPERR_YPERR);
1183 }
1184
1185 int
1186 _yp_check(char **dom)
1187 {
1188         char *unused;
1189
1190         YPLOCK();
1191         if (_yp_domain[0]=='\0')
1192                 if (yp_get_default_domain_locked(&unused)) {
1193                         YPUNLOCK();
1194                         return (0);
1195                 }
1196
1197         if (dom)
1198                 *dom = _yp_domain;
1199
1200         if (yp_bind_locked(_yp_domain) == 0) {
1201                 yp_unbind_locked(_yp_domain);
1202                 YPUNLOCK();
1203                 return (1);
1204         }
1205         YPUNLOCK();
1206         return (0);
1207 }