lib/libc/rpc/getrpcent.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user or with the express written consent of
   8  * Sun Microsystems, Inc.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  *
  30  * @(#)getrpcent.c 1.14 91/03/11 Copyr 1984 Sun Micro
  31  * $NetBSD: getrpcent.c,v 1.17 2000/01/22 22:19:17 mycroft Exp $
  32  * $FreeBSD: src/lib/libc/rpc/getrpcent.c,v 1.16 2007/05/17 03:34:33 jon Exp $
  33  * $DragonFly: src/lib/libc/rpc/getrpcent.c,v 1.4 2005/11/13 12:27:04 swildner Exp $
  34  */
  35
  36 /*
  37  * Copyright (c) 1984 by Sun Microsystems, Inc.
  38  */
  39
  40 #include <sys/param.h>
  41 #include <sys/types.h>
  42 #include <sys/socket.h>
  43 #include <arpa/inet.h>
  44 #include <assert.h>
  45 #include <errno.h>
  46 #include <nsswitch.h>
  47 #include <netinet/in.h>
  48 #include <stdio.h>
  49 #include <string.h>
  50 #include <stdarg.h>
  51 #include <stdlib.h>
  52 #include <rpc/rpc.h>
  53 #ifdef YP
  54 #include <rpcsvc/yp_prot.h>
  55 #include <rpcsvc/ypclnt.h>
  56 #endif
  57 #include <unistd.h>
  58 #include "namespace.h"
  59 #include "reentrant.h"
  60 #include "un-namespace.h"
  61 #include "libc_private.h"
  62 #include "nss_tls.h"
  63 #ifdef NS_CACHING
  64 #include "nscache.h"
  65 #endif
  66
  67 #define RPCDB   "/etc/rpc"
  68
  69 /* nsswitch declarations */
  70 enum constants
  71 {
  72         SETRPCENT = 1,
  73         ENDRPCENT = 2,
  74         RPCENT_STORAGE_INITIAL  = 1 << 10, /* 1 KByte */
  75         RPCENT_STORAGE_MAX      = 1 << 20, /* 1 MByte */
  76 };
  77
  78 static const ns_src defaultsrc[] = {
  79         { NSSRC_FILES, NS_SUCCESS },
  80 #ifdef YP
  81         { NSSRC_NIS, NS_SUCCESS },
  82 #endif
  83         { NULL, 0 }
  84 };
  85
  86 /* files backend declarations */
  87 struct files_state {
  88         FILE    *fp;
  89         int     stayopen;
  90 };
  91
  92 static  int     files_rpcent(void *, void *, va_list);
  93 static  int     files_setrpcent(void *, void *, va_list);
  94
  95 static  void    files_endstate(void *);
  96 NSS_TLS_HANDLING(files);
  97
  98 /* nis backend declarations */
  99 #ifdef YP
 100 struct nis_state {
 101         char    domain[MAXHOSTNAMELEN];
 102         char    *current;
 103         int     currentlen;
 104         int     stepping;
 105         int     no_name_map;
 106 };
 107
 108 static  int     nis_rpcent(void *, void *, va_list);
 109 static  int     nis_setrpcent(void *, void *, va_list);
 110
 111 static  void    nis_endstate(void *);
 112 NSS_TLS_HANDLING(nis);
 113 #endif
 114
 115 /* get** wrappers for get**_r functions declarations */
 116 struct rpcent_state {
 117         struct rpcent   rpc;
 118         char            *buffer;
 119         size_t  bufsize;
 120 };
 121 static  void    rpcent_endstate(void *);
 122 NSS_TLS_HANDLING(rpcent);
 123
 124 union key {
 125         const char      *name;
 126         int             number;
 127 };
 128
 129 static int wrap_getrpcbyname_r(union key, struct rpcent *, char *,
 130                         size_t, struct rpcent **);
 131 static int wrap_getrpcbynumber_r(union key, struct rpcent *, char *,
 132                         size_t, struct rpcent **);
 133 static int wrap_getrpcent_r(union key, struct rpcent *, char *,
 134                         size_t, struct rpcent **);
 135 static struct rpcent *getrpc(int (*fn)(union key, struct rpcent *, char *,
 136                         size_t, struct rpcent **), union key);
 137
 138 #ifdef NS_CACHING
 139 static int rpc_id_func(char *, size_t *, va_list, void *);
 140 static int rpc_marshal_func(char *, size_t *, void *, va_list, void *);
 141 static int rpc_unmarshal_func(char *, size_t, void *, va_list, void *);
 142 #endif
 143
 144 static int
 145 rpcent_unpack(char *p, struct rpcent *rpc, char **r_aliases,
 146         size_t aliases_size, int *errnop)
 147 {
 148         char *cp, **q;
 149
 150         assert(p != NULL);
 151
 152         if (*p == '#')
 153                 return (-1);
 154         cp = strpbrk(p, "#\n");
 155         if (cp == NULL)
 156                 return (-1);
 157         *cp = '\0';
 158         cp = strpbrk(p, " \t");
 159         if (cp == NULL)
 160                 return (-1);
 161         *cp++ = '\0';
 162         /* THIS STUFF IS INTERNET SPECIFIC */
 163         rpc->r_name = p;
 164         while (*cp == ' ' || *cp == '\t')
 165                 cp++;
 166         rpc->r_number = atoi(cp);
 167         q = rpc->r_aliases = r_aliases;
 168         cp = strpbrk(cp, " \t");
 169         if (cp != NULL)
 170                 *cp++ = '\0';
 171         while (cp && *cp) {
 172                 if (*cp == ' ' || *cp == '\t') {
 173                         cp++;
 174                         continue;
 175                 }
 176                 if (q < &(r_aliases[aliases_size - 1]))
 177                         *q++ = cp;
 178                 else {
 179                         *errnop = ERANGE;
 180                         return -1;
 181                 }
 182
 183                 cp = strpbrk(cp, " \t");
 184                 if (cp != NULL)
 185                         *cp++ = '\0';
 186         }
 187         *q = NULL;
 188         return 0;
 189 }
 190
 191 /* files backend implementation */
 192 static  void
 193 files_endstate(void *p)
 194 {
 195         FILE * f;
 196
 197         if (p == NULL)
 198                 return;
 199
 200         f = ((struct files_state *)p)->fp;
 201         if (f != NULL)
 202                 fclose(f);
 203
 204         free(p);
 205 }
 206
 207 static int
 208 files_rpcent(void *retval, void *mdata, va_list ap)
 209 {
 210         char *name;
 211         int number;
 212         struct rpcent *rpc;
 213         char *buffer;
 214         size_t bufsize;
 215         int *errnop;
 216
 217         char *line;
 218         size_t linesize;
 219         char **aliases;
 220         int aliases_size;
 221         char **rp;
 222
 223         struct files_state      *st;
 224         int rv;
 225         int stayopen;
 226         enum nss_lookup_type how;
 227
 228         how = (enum nss_lookup_type)mdata;
 229         switch (how)
 230         {
 231         case nss_lt_name:
 232                 name = va_arg(ap, char *);
 233                 break;
 234         case nss_lt_id:
 235                 number = va_arg(ap, int);
 236                 break;
 237         case nss_lt_all:
 238                 break;
 239         default:
 240                 return (NS_NOTFOUND);
 241         }
 242
 243         rpc = va_arg(ap, struct rpcent *);
 244         buffer = va_arg(ap, char *);
 245         bufsize = va_arg(ap, size_t);
 246         errnop = va_arg(ap, int *);
 247
 248         *errnop = files_getstate(&st);
 249         if (*errnop != 0)
 250                 return (NS_UNAVAIL);
 251
 252         if (st->fp == NULL && (st->fp = fopen(RPCDB, "r")) == NULL) {
 253                 *errnop = errno;
 254                 return (NS_UNAVAIL);
 255         }
 256
 257         if (how == nss_lt_all)
 258                 stayopen = 1;
 259         else {
 260                 rewind(st->fp);
 261                 stayopen = st->stayopen;
 262         }
 263
 264         do {
 265                 if ((line = fgetln(st->fp, &linesize)) == NULL) {
 266                         *errnop = errno;
 267                         rv = NS_RETURN;
 268                         break;
 269                 }
 270
 271                 if (bufsize <= linesize + _ALIGNBYTES + sizeof(char *)) {
 272                         *errnop = ERANGE;
 273                         rv = NS_RETURN;
 274                         break;
 275                 }
 276
 277                 aliases = (char **)_ALIGN(&buffer[linesize+1]);
 278                 aliases_size = (buffer + bufsize -
 279                         (char *)aliases)/sizeof(char *);
 280                 if (aliases_size < 1) {
 281                         *errnop = ERANGE;
 282                         rv = NS_RETURN;
 283                         break;
 284                 }
 285
 286                 memcpy(buffer, line, linesize);
 287                 buffer[linesize] = '\0';
 288
 289                 rv = rpcent_unpack(buffer, rpc, aliases, aliases_size, errnop);
 290                 if (rv != 0) {
 291                         if (*errnop == 0) {
 292                                 rv = NS_NOTFOUND;
 293                                 continue;
 294                         }
 295                         else {
 296                                 rv = NS_RETURN;
 297                                 break;
 298                         }
 299                 }
 300
 301                 switch (how)
 302                 {
 303                 case nss_lt_name:
 304                         if (strcmp(rpc->r_name, name) == 0)
 305                                 goto done;
 306                         for (rp = rpc->r_aliases; *rp != NULL; rp++) {
 307                                 if (strcmp(*rp, name) == 0)
 308                                         goto done;
 309                         }
 310                         rv = NS_NOTFOUND;
 311                         continue;
 312 done:
 313                         rv = NS_SUCCESS;
 314                         break;
 315                 case nss_lt_id:
 316                         rv = (rpc->r_number == number) ? NS_SUCCESS :
 317                                 NS_NOTFOUND;
 318                         break;
 319                 case nss_lt_all:
 320                         rv = NS_SUCCESS;
 321                         break;
 322                 }
 323
 324         } while (!(rv & NS_TERMINATE));
 325
 326         if (!stayopen && st->fp!=NULL) {
 327                 fclose(st->fp);
 328                 st->fp = NULL;
 329         }
 330
 331         if ((rv == NS_SUCCESS) && (retval != NULL))
 332                 *((struct rpcent **)retval) = rpc;
 333
 334         return (rv);
 335 }
 336
 337 static int
 338 files_setrpcent(void *retval, void *mdata, va_list ap)
 339 {
 340         struct files_state      *st;
 341         int     rv;
 342         int     f;
 343
 344         rv = files_getstate(&st);
 345         if (rv != 0)
 346                 return (NS_UNAVAIL);
 347
 348         switch ((enum constants)mdata)
 349         {
 350         case SETRPCENT:
 351                 f = va_arg(ap,int);
 352                 if (st->fp == NULL)
 353                         st->fp = fopen(RPCDB, "r");
 354                 else
 355                         rewind(st->fp);
 356                 st->stayopen |= f;
 357                 break;
 358         case ENDRPCENT:
 359                 if (st->fp != NULL) {
 360                         fclose(st->fp);
 361                         st->fp = NULL;
 362                 }
 363                 st->stayopen = 0;
 364                 break;
 365         default:
 366                 break;
 367         }
 368
 369         return (NS_UNAVAIL);
 370 }
 371
 372 /* nis backend implementation */
 373 #ifdef YP
 374 static  void
 375 nis_endstate(void *p)
 376 {
 377         if (p == NULL)
 378                 return;
 379
 380         free(((struct nis_state *)p)->current);
 381         free(p);
 382 }
 383
 384 static int
 385 nis_rpcent(void *retval, void *mdata, va_list ap)
 386 {
 387         char            *name;
 388         int             number;
 389         struct rpcent   *rpc;
 390         char            *buffer;
 391         size_t  bufsize;
 392         int             *errnop;
 393
 394         char            **rp;
 395         char            **aliases;
 396         int             aliases_size;
 397
 398         char    *lastkey;
 399         char    *resultbuf;
 400         int     resultbuflen;
 401         char    buf[YPMAXRECORD + 2];
 402
 403         struct nis_state        *st;
 404         int             rv;
 405         enum nss_lookup_type    how;
 406         int     no_name_active;
 407
 408         how = (enum nss_lookup_type)mdata;
 409         switch (how)
 410         {
 411         case nss_lt_name:
 412                 name = va_arg(ap, char *);
 413                 break;
 414         case nss_lt_id:
 415                 number = va_arg(ap, int);
 416                 break;
 417         case nss_lt_all:
 418                 break;
 419         default:
 420                 return (NS_NOTFOUND);
 421         }
 422
 423         rpc = va_arg(ap, struct rpcent *);
 424         buffer = va_arg(ap, char *);
 425         bufsize = va_arg(ap, size_t);
 426         errnop = va_arg(ap, int *);
 427
 428         *errnop = nis_getstate(&st);
 429         if (*errnop != 0)
 430                 return (NS_UNAVAIL);
 431
 432         if (st->domain[0] == '\0') {
 433                 if (getdomainname(st->domain, sizeof(st->domain)) != 0) {
 434                         *errnop = errno;
 435                         return (NS_UNAVAIL);
 436                 }
 437         }
 438
 439         no_name_active = 0;
 440         do {
 441                 switch (how)
 442                 {
 443                 case nss_lt_name:
 444                         if (!st->no_name_map)
 445                         {
 446                                 snprintf(buf, sizeof buf, "%s", name);
 447                                 rv = yp_match(st->domain, "rpc.byname", buf,
 448                                         strlen(buf), &resultbuf, &resultbuflen);
 449
 450                                 switch (rv) {
 451                                 case 0:
 452                                         break;
 453                                 case YPERR_MAP:
 454                                         st->stepping = 0;
 455                                         no_name_active = 1;
 456                                         how = nss_lt_all;
 457
 458                                         rv = NS_NOTFOUND;
 459                                         continue;
 460                                 default:
 461                                         rv = NS_NOTFOUND;
 462                                         goto fin;
 463                                 }
 464                         } else {
 465                                 st->stepping = 0;
 466                                 no_name_active = 1;
 467                                 how = nss_lt_all;
 468
 469                                 rv = NS_NOTFOUND;
 470                                 continue;
 471                         }
 472                 break;
 473                 case nss_lt_id:
 474                         snprintf(buf, sizeof buf, "%d", number);
 475                         if (yp_match(st->domain, "rpc.bynumber", buf,
 476                                 strlen(buf), &resultbuf, &resultbuflen)) {
 477                                 rv = NS_NOTFOUND;
 478                                 goto fin;
 479                         }
 480                         break;
 481                 case nss_lt_all:
 482                                 if (!st->stepping) {
 483                                         rv = yp_first(st->domain, "rpc.bynumber",
 484                                                 &st->current,
 485                                                 &st->currentlen, &resultbuf,
 486                                                 &resultbuflen);
 487                                         if (rv) {
 488                                                 rv = NS_NOTFOUND;
 489                                                 goto fin;
 490                                         }
 491                                         st->stepping = 1;
 492                                 } else {
 493                                         lastkey = st->current;
 494                                         rv = yp_next(st->domain, "rpc.bynumber",
 495                                                 st->current,
 496                                                 st->currentlen, &st->current,
 497                                                 &st->currentlen,
 498                                                 &resultbuf,     &resultbuflen);
 499                                         free(lastkey);
 500                                         if (rv) {
 501                                                 st->stepping = 0;
 502                                                 rv = NS_NOTFOUND;
 503                                                 goto fin;
 504                                         }
 505                                 }
 506                         break;
 507                 }
 508
 509                 /* we need a room for additional \n symbol */
 510                 if (bufsize <= resultbuflen + 1 + _ALIGNBYTES +
 511                     sizeof(char *)) {
 512                         *errnop = ERANGE;
 513                         rv = NS_RETURN;
 514                         break;
 515                 }
 516
 517                 aliases=(char **)_ALIGN(&buffer[resultbuflen+2]);
 518                 aliases_size = (buffer + bufsize - (char *)aliases) /
 519                         sizeof(char *);
 520                 if (aliases_size < 1) {
 521                         *errnop = ERANGE;
 522                         rv = NS_RETURN;
 523                         break;
 524                 }
 525
 526                 /*
 527                  * rpcent_unpack expects lines terminated with \n -- make it happy
 528                  */
 529                 memcpy(buffer, resultbuf, resultbuflen);
 530                 buffer[resultbuflen] = '\n';
 531                 buffer[resultbuflen+1] = '\0';
 532                 free(resultbuf);
 533
 534                 if (rpcent_unpack(buffer, rpc, aliases, aliases_size,
 535                     errnop) != 0) {
 536                         if (*errnop == 0)
 537                                 rv = NS_NOTFOUND;
 538                         else
 539                                 rv = NS_RETURN;
 540                 } else {
 541                         if ((how == nss_lt_all) && (no_name_active != 0)) {
 542                                 if (strcmp(rpc->r_name, name) == 0)
 543                                         goto done;
 544                                 for (rp = rpc->r_aliases; *rp != NULL; rp++) {
 545                                         if (strcmp(*rp, name) == 0)
 546                                                 goto done;
 547                                 }
 548                                 rv = NS_NOTFOUND;
 549                                 continue;
 550 done:
 551                                 rv = NS_SUCCESS;
 552                         } else
 553                                 rv = NS_SUCCESS;
 554                 }
 555
 556         } while (!(rv & NS_TERMINATE) && (how == nss_lt_all));
 557
 558 fin:
 559         if ((rv == NS_SUCCESS) && (retval != NULL))
 560                 *((struct rpcent **)retval) = rpc;
 561
 562         return (rv);
 563 }
 564
 565 static int
 566 nis_setrpcent(void *retval, void *mdata, va_list ap)
 567 {
 568         struct nis_state        *st;
 569         int     rv;
 570
 571         rv = nis_getstate(&st);
 572         if (rv != 0)
 573                 return (NS_UNAVAIL);
 574
 575         switch ((enum constants)mdata)
 576         {
 577         case SETRPCENT:
 578         case ENDRPCENT:
 579                 free(st->current);
 580                 st->current = NULL;
 581                 st->stepping = 0;
 582                 break;
 583         default:
 584                 break;
 585         }
 586
 587         return (NS_UNAVAIL);
 588 }
 589 #endif
 590
 591 #ifdef NS_CACHING
 592 static int
 593 rpc_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata)
 594 {
 595         char *name;
 596         int rpc;
 597
 598         size_t desired_size, size;
 599         enum nss_lookup_type lookup_type;
 600         int res = NS_UNAVAIL;
 601
 602         lookup_type = (enum nss_lookup_type)cache_mdata;
 603         switch (lookup_type) {
 604         case nss_lt_name:
 605                 name = va_arg(ap, char *);
 606
 607                 size = strlen(name);
 608                 desired_size = sizeof(enum nss_lookup_type) + size + 1;
 609                 if (desired_size > *buffer_size) {
 610                         res = NS_RETURN;
 611                         goto fin;
 612                 }
 613
 614                 memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type));
 615                 memcpy(buffer + sizeof(enum nss_lookup_type), name, size + 1);
 616
 617                 res = NS_SUCCESS;
 618                 break;
 619         case nss_lt_id:
 620                 rpc = va_arg(ap, int);
 621
 622                 desired_size = sizeof(enum nss_lookup_type) + sizeof(int);
 623                 if (desired_size > *buffer_size) {
 624                         res = NS_RETURN;
 625                         goto fin;
 626                 }
 627
 628                 memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type));
 629                 memcpy(buffer + sizeof(enum nss_lookup_type), &rpc,
 630                     sizeof(int));
 631
 632                 res = NS_SUCCESS;
 633                 break;
 634         default:
 635                 /* should be unreachable */
 636                 return (NS_UNAVAIL);
 637         }
 638
 639 fin:
 640         *buffer_size = desired_size;
 641         return (res);
 642 }
 643
 644 static int
 645 rpc_marshal_func(char *buffer, size_t *buffer_size, void *retval, va_list ap,
 646     void *cache_mdata)
 647 {
 648         char *name;
 649         int num;
 650         struct rpcent *rpc;
 651         char *orig_buf;
 652         size_t orig_buf_size;
 653
 654         struct rpcent new_rpc;
 655         size_t desired_size, size, aliases_size;
 656         char *p;
 657         char **alias;
 658
 659         switch ((enum nss_lookup_type)cache_mdata) {
 660         case nss_lt_name:
 661                 name = va_arg(ap, char *);
 662                 break;
 663         case nss_lt_id:
 664                 num = va_arg(ap, int);
 665                 break;
 666         case nss_lt_all:
 667                 break;
 668         default:
 669                 /* should be unreachable */
 670                 return (NS_UNAVAIL);
 671         }
 672
 673         rpc = va_arg(ap, struct rpcent *);
 674         orig_buf = va_arg(ap, char *);
 675         orig_buf_size = va_arg(ap, size_t);
 676
 677         desired_size = _ALIGNBYTES + sizeof(struct rpcent) + sizeof(char *);
 678         if (rpc->r_name != NULL)
 679                 desired_size += strlen(rpc->r_name) + 1;
 680
 681         if (rpc->r_aliases != NULL) {
 682                 aliases_size = 0;
 683                 for (alias = rpc->r_aliases; *alias; ++alias) {
 684                         desired_size += strlen(*alias) + 1;
 685                         ++aliases_size;
 686                 }
 687
 688                 desired_size += _ALIGNBYTES + (aliases_size + 1) *
 689                     sizeof(char *);
 690         }
 691
 692         if (*buffer_size < desired_size) {
 693                 /* this assignment is here for future use */
 694                 *buffer_size = desired_size;
 695                 return (NS_RETURN);
 696         }
 697
 698         memcpy(&new_rpc, rpc, sizeof(struct rpcent));
 699
 700         *buffer_size = desired_size;
 701         memset(buffer, 0, desired_size);
 702         p = buffer + sizeof(struct rpcent) + sizeof(char *);
 703         memcpy(buffer + sizeof(struct rpcent), &p, sizeof(char *));
 704         p = (char *)_ALIGN(p);
 705
 706         if (new_rpc.r_name != NULL) {
 707                 size = strlen(new_rpc.r_name);
 708                 memcpy(p, new_rpc.r_name, size);
 709                 new_rpc.r_name = p;
 710                 p += size + 1;
 711         }
 712
 713         if (new_rpc.r_aliases != NULL) {
 714                 p = (char *)_ALIGN(p);
 715                 memcpy(p, new_rpc.r_aliases, sizeof(char *) * aliases_size);
 716                 new_rpc.r_aliases = (char **)p;
 717                 p += sizeof(char *) * (aliases_size + 1);
 718
 719                 for (alias = new_rpc.r_aliases; *alias; ++alias) {
 720                         size = strlen(*alias);
 721                         memcpy(p, *alias, size);
 722                         *alias = p;
 723                         p += size + 1;
 724                 }
 725         }
 726
 727         memcpy(buffer, &new_rpc, sizeof(struct rpcent));
 728         return (NS_SUCCESS);
 729 }
 730
 731 static int
 732 rpc_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
 733     void *cache_mdata)
 734 {
 735         char *name;
 736         int num;
 737         struct rpcent *rpc;
 738         char *orig_buf;
 739         size_t orig_buf_size;
 740         int *ret_errno;
 741
 742         char *p;
 743         char **alias;
 744
 745         switch ((enum nss_lookup_type)cache_mdata) {
 746         case nss_lt_name:
 747                 name = va_arg(ap, char *);
 748                 break;
 749         case nss_lt_id:
 750                 num = va_arg(ap, int);
 751                 break;
 752         case nss_lt_all:
 753                 break;
 754         default:
 755                 /* should be unreachable */
 756                 return (NS_UNAVAIL);
 757         }
 758
 759         rpc = va_arg(ap, struct rpcent *);
 760         orig_buf = va_arg(ap, char *);
 761         orig_buf_size = va_arg(ap, size_t);
 762         ret_errno = va_arg(ap, int *);
 763
 764         if (orig_buf_size <
 765             buffer_size - sizeof(struct rpcent) - sizeof(char *)) {
 766                 *ret_errno = ERANGE;
 767                 return (NS_RETURN);
 768         }
 769
 770         memcpy(rpc, buffer, sizeof(struct rpcent));
 771         memcpy(&p, buffer + sizeof(struct rpcent), sizeof(char *));
 772
 773         orig_buf = (char *)_ALIGN(orig_buf);
 774         memcpy(orig_buf, buffer + sizeof(struct rpcent) + sizeof(char *) +
 775             _ALIGN(p) - (size_t)p,
 776             buffer_size - sizeof(struct rpcent) - sizeof(char *) -
 777             _ALIGN(p) + (size_t)p);
 778         p = (char *)_ALIGN(p);
 779
 780         NS_APPLY_OFFSET(rpc->r_name, orig_buf, p, char *);
 781         if (rpc->r_aliases != NULL) {
 782                 NS_APPLY_OFFSET(rpc->r_aliases, orig_buf, p, char **);
 783
 784                 for (alias = rpc->r_aliases     ; *alias; ++alias)
 785                         NS_APPLY_OFFSET(*alias, orig_buf, p, char *);
 786         }
 787
 788         if (retval != NULL)
 789                 *((struct rpcent **)retval) = rpc;
 790
 791         return (NS_SUCCESS);
 792 }
 793
 794 NSS_MP_CACHE_HANDLING(rpc);
 795 #endif /* NS_CACHING */
 796
 797
 798 /* get**_r functions implementation */
 799 static int
 800 getrpcbyname_r(const char *name, struct rpcent *rpc, char *buffer,
 801         size_t bufsize, struct rpcent **result)
 802 {
 803 #ifdef NS_CACHING
 804         static const nss_cache_info cache_info =
 805                 NS_COMMON_CACHE_INFO_INITIALIZER(
 806                 rpc, (void *)nss_lt_name,
 807                 rpc_id_func, rpc_marshal_func, rpc_unmarshal_func);
 808 #endif
 809         static const ns_dtab dtab[] = {
 810                 { NSSRC_FILES, files_rpcent, (void *)nss_lt_name },
 811 #ifdef YP
 812                 { NSSRC_NIS, nis_rpcent, (void *)nss_lt_name },
 813 #endif
 814 #ifdef NS_CACHING
 815                 NS_CACHE_CB(&cache_info)
 816 #endif
 817                 { NULL, NULL, NULL }
 818         };
 819         int rv, ret_errno;
 820
 821         ret_errno = 0;
 822         *result = NULL;
 823         rv = nsdispatch(result, dtab, NSDB_RPC, "getrpcbyname_r", defaultsrc,
 824             name, rpc, buffer, bufsize, &ret_errno);
 825
 826         if (rv == NS_SUCCESS)
 827                 return (0);
 828         else
 829                 return (ret_errno);
 830 }
 831
 832 static int
 833 getrpcbynumber_r(int number, struct rpcent *rpc, char *buffer,
 834         size_t bufsize, struct rpcent **result)
 835 {
 836 #ifdef NS_CACHING
 837         static const nss_cache_info cache_info =
 838                 NS_COMMON_CACHE_INFO_INITIALIZER(
 839                 rpc, (void *)nss_lt_id,
 840                 rpc_id_func, rpc_marshal_func, rpc_unmarshal_func);
 841 #endif
 842         static const ns_dtab dtab[] = {
 843                 { NSSRC_FILES, files_rpcent, (void *)nss_lt_id },
 844 #ifdef YP
 845                 { NSSRC_NIS, nis_rpcent, (void *)nss_lt_id },
 846 #endif
 847 #ifdef NS_CACHING
 848                 NS_CACHE_CB(&cache_info)
 849 #endif
 850                 { NULL, NULL, NULL }
 851         };
 852         int rv, ret_errno;
 853
 854         ret_errno = 0;
 855         *result = NULL;
 856         rv = nsdispatch(result, dtab, NSDB_RPC, "getrpcbynumber_r", defaultsrc,
 857             number, rpc, buffer, bufsize, &ret_errno);
 858
 859         if (rv == NS_SUCCESS)
 860                 return (0);
 861         else
 862                 return (ret_errno);
 863 }
 864
 865 static int
 866 getrpcent_r(struct rpcent *rpc, char *buffer, size_t bufsize,
 867         struct rpcent **result)
 868 {
 869 #ifdef NS_CACHING
 870         static const nss_cache_info cache_info = NS_MP_CACHE_INFO_INITIALIZER(
 871                 rpc, (void *)nss_lt_all,
 872                 rpc_marshal_func, rpc_unmarshal_func);
 873 #endif
 874         static const ns_dtab dtab[] = {
 875                 { NSSRC_FILES, files_rpcent, (void *)nss_lt_all },
 876 #ifdef YP
 877                 { NSSRC_NIS, nis_rpcent, (void *)nss_lt_all },
 878 #endif
 879 #ifdef NS_CACHING
 880                 NS_CACHE_CB(&cache_info)
 881 #endif
 882                 { NULL, NULL, NULL }
 883         };
 884         int rv, ret_errno;
 885
 886         ret_errno = 0;
 887         *result = NULL;
 888         rv = nsdispatch(result, dtab, NSDB_RPC, "getrpcent_r", defaultsrc,
 889             rpc, buffer, bufsize, &ret_errno);
 890
 891         if (rv == NS_SUCCESS)
 892                 return (0);
 893         else
 894                 return (ret_errno);
 895 }
 896
 897 /* get** wrappers for get**_r functions implementation */
 898 static  void
 899 rpcent_endstate(void *p)
 900 {
 901         if (p == NULL)
 902                 return;
 903
 904         free(((struct rpcent_state *)p)->buffer);
 905         free(p);
 906 }
 907
 908 static  int
 909 wrap_getrpcbyname_r(union key key, struct rpcent *rpc, char *buffer,
 910     size_t bufsize, struct rpcent **res)
 911 {
 912         return (getrpcbyname_r(key.name, rpc, buffer, bufsize, res));
 913 }
 914
 915 static  int
 916 wrap_getrpcbynumber_r(union key key, struct rpcent *rpc, char *buffer,
 917     size_t bufsize, struct rpcent **res)
 918 {
 919         return (getrpcbynumber_r(key.number, rpc, buffer, bufsize, res));
 920 }
 921
 922 static  int
 923 wrap_getrpcent_r(union key key __unused, struct rpcent *rpc, char *buffer,
 924     size_t bufsize, struct rpcent **res)
 925 {
 926         return (getrpcent_r(rpc, buffer, bufsize, res));
 927 }
 928
 929 static struct rpcent *
 930 getrpc(int (*fn)(union key, struct rpcent *, char *, size_t, struct rpcent **),
 931     union key key)
 932 {
 933         int              rv;
 934         struct rpcent   *res;
 935         struct rpcent_state * st;
 936
 937         rv=rpcent_getstate(&st);
 938         if (rv != 0) {
 939                 errno = rv;
 940                 return NULL;
 941         }
 942
 943         if (st->buffer == NULL) {
 944                 st->buffer = malloc(RPCENT_STORAGE_INITIAL);
 945                 if (st->buffer == NULL)
 946                         return (NULL);
 947                 st->bufsize = RPCENT_STORAGE_INITIAL;
 948         }
 949         do {
 950                 rv = fn(key, &st->rpc, st->buffer, st->bufsize, &res);
 951                 if (res == NULL && rv == ERANGE) {
 952                         free(st->buffer);
 953                         if ((st->bufsize << 1) > RPCENT_STORAGE_MAX) {
 954                                 st->buffer = NULL;
 955                                 errno = ERANGE;
 956                                 return (NULL);
 957                         }
 958                         st->bufsize <<= 1;
 959                         st->buffer = malloc(st->bufsize);
 960                         if (st->buffer == NULL)
 961                                 return (NULL);
 962                 }
 963         } while (res == NULL && rv == ERANGE);
 964         if (rv != 0)
 965                 errno = rv;
 966
 967         return (res);
 968 }
 969
 970 struct rpcent *
 971 getrpcbyname(char *name)
 972 {
 973         union key key;
 974
 975         key.name = name;
 976
 977         return (getrpc(wrap_getrpcbyname_r, key));
 978 }
 979
 980 struct rpcent *
 981 getrpcbynumber(int number)
 982 {
 983         union key key;
 984
 985         key.number = number;
 986
 987         return (getrpc(wrap_getrpcbynumber_r, key));
 988 }
 989
 990 struct rpcent *
 991 getrpcent(void)
 992 {
 993         union key key;
 994
 995         key.number = 0; /* not used */
 996
 997         return (getrpc(wrap_getrpcent_r, key));
 998 }
 999
1000 void
1001 setrpcent(int stayopen)
1002 {
1003 #ifdef NS_CACHING
1004         static const nss_cache_info cache_info = NS_MP_CACHE_INFO_INITIALIZER(
1005                 rpc, (void *)nss_lt_all,
1006                 NULL, NULL);
1007 #endif
1008
1009         static const ns_dtab dtab[] = {
1010                 { NSSRC_FILES, files_setrpcent, (void *)SETRPCENT },
1011 #ifdef YP
1012                 { NSSRC_NIS, nis_setrpcent, (void *)SETRPCENT },
1013 #endif
1014 #ifdef NS_CACHING
1015                 NS_CACHE_CB(&cache_info)
1016 #endif
1017                 { NULL, NULL, NULL }
1018         };
1019
1020         nsdispatch(NULL, dtab, NSDB_RPC, "setrpcent", defaultsrc, stayopen);
1021 }
1022
1023 void
1024 endrpcent(void)
1025 {
1026 #ifdef NS_CACHING
1027         static const nss_cache_info cache_info = NS_MP_CACHE_INFO_INITIALIZER(
1028                 rpc, (void *)nss_lt_all,
1029                 NULL, NULL);
1030 #endif
1031
1032         static const ns_dtab dtab[] = {
1033                 { NSSRC_FILES, files_setrpcent, (void *)ENDRPCENT },
1034 #ifdef YP
1035                 { NSSRC_NIS, nis_setrpcent, (void *)ENDRPCENT },
1036 #endif
1037 #ifdef NS_CACHING
1038                 NS_CACHE_CB(&cache_info)
1039 #endif
1040                 { NULL, NULL, NULL }
1041         };
1042
1043         nsdispatch(NULL, dtab, NSDB_RPC, "endrpcent", defaultsrc);
1044 }