usr.sbin/rpcbind/rpcb_svc_4.c

   1 /*      $NetBSD: rpcb_svc_4.c,v 1.5 2006/05/25 02:33:16 christos Exp $  */
   2
   3 /*
   4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   5  * unrestricted use provided that this legend is included on all tape
   6  * media and as a part of the software program in whole or part.  Users
   7  * may copy or modify Sun RPC without charge, but are not authorized
   8  * to license or distribute it to anyone else except as part of a product or
   9  * program developed by the user.
  10  *
  11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  14  *
  15  * Sun RPC is provided with no support and without any obligation on the
  16  * part of Sun Microsystems, Inc. to assist in its use, correction,
  17  * modification or enhancement.
  18  *
  19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  21  * OR ANY PART THEREOF.
  22  *
  23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  24  * or profits or other special, indirect and consequential damages, even if
  25  * Sun has been advised of the possibility of such damages.
  26  *
  27  * Sun Microsystems, Inc.
  28  * 2550 Garcia Avenue
  29  * Mountain View, California  94043
  30  */
  31 /*
  32  * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc.
  33  */
  34
  35 /* #ident       "@(#)rpcb_svc_4.c       1.8     93/07/05 SMI" */
  36
  37 /*
  38  * rpcb_svc_4.c
  39  * The server procedure for the version 4 rpcbind.
  40  *
  41  */
  42
  43 #include <sys/types.h>
  44 #include <sys/stat.h>
  45 #include <rpc/rpc.h>
  46 #include <stdio.h>
  47 #include <unistd.h>
  48 #include <netconfig.h>
  49 #include <syslog.h>
  50 #include <string.h>
  51 #include <stdlib.h>
  52 #include "rpcbind.h"
  53
  54 static void *rpcbproc_getaddr_4_local(void *, struct svc_req *, SVCXPRT *,
  55     rpcvers_t);
  56 static void *rpcbproc_getversaddr_4_local(void *, struct svc_req *, SVCXPRT *,
  57     rpcvers_t);
  58 static void *rpcbproc_getaddrlist_4_local(void *, struct svc_req *, SVCXPRT *,
  59     rpcvers_t);
  60 static void free_rpcb_entry_list(rpcb_entry_list_ptr *);
  61 static void *rpcbproc_dump_4_local(void *, struct svc_req *, SVCXPRT *,
  62     rpcvers_t);
  63
  64 /*
  65  * Called by svc_getreqset. There is a separate server handle for
  66  * every transport that it waits on.
  67  */
  68 void
  69 rpcb_service_4(struct svc_req *rqstp, SVCXPRT *transp)
  70 {
  71         union {
  72                 rpcb rpcbproc_set_4_arg;
  73                 rpcb rpcbproc_unset_4_arg;
  74                 rpcb rpcbproc_getaddr_4_local_arg;
  75                 char *rpcbproc_uaddr2taddr_4_arg;
  76                 struct netbuf rpcbproc_taddr2uaddr_4_arg;
  77         } argument;
  78         char *result;
  79         xdrproc_t xdr_argument, xdr_result;
  80         void *(*local)(void *, struct svc_req *, SVCXPRT *, rpcvers_t);
  81
  82         rpcbs_procinfo(RPCBVERS_4_STAT, rqstp->rq_proc);
  83
  84         switch (rqstp->rq_proc) {
  85         case NULLPROC:
  86                 /*
  87                  * Null proc call
  88                  */
  89 #ifdef RPCBIND_DEBUG
  90                 if (debugging)
  91                         fprintf(stderr, "RPCBPROC_NULL\n");
  92 #endif
  93                 check_access(transp, rqstp->rq_proc, NULL, RPCBVERS4);
  94                 (void) svc_sendreply(transp, (xdrproc_t) xdr_void,
  95                                         (char *)NULL);
  96                 return;
  97
  98         case RPCBPROC_SET:
  99                 /*
 100                  * Check to see whether the message came from
 101                  * loopback transports (for security reasons)
 102                  */
 103                 xdr_argument = (xdrproc_t)xdr_rpcb;
 104                 xdr_result = (xdrproc_t)xdr_bool;
 105                 local = rpcbproc_set_com;
 106                 break;
 107
 108         case RPCBPROC_UNSET:
 109                 /*
 110                  * Check to see whether the message came from
 111                  * loopback transports (for security reasons)
 112                  */
 113                 xdr_argument = (xdrproc_t)xdr_rpcb;
 114                 xdr_result = (xdrproc_t)xdr_bool;
 115                 local = rpcbproc_unset_com;
 116                 break;
 117
 118         case RPCBPROC_GETADDR:
 119                 xdr_argument = (xdrproc_t)xdr_rpcb;
 120                 xdr_result = (xdrproc_t)xdr_wrapstring;
 121                 local = rpcbproc_getaddr_4_local;
 122                 break;
 123
 124         case RPCBPROC_GETVERSADDR:
 125 #ifdef RPCBIND_DEBUG
 126                 if (debugging)
 127                         fprintf(stderr, "RPCBPROC_GETVERSADDR\n");
 128 #endif
 129                 xdr_argument = (xdrproc_t)xdr_rpcb;
 130                 xdr_result = (xdrproc_t)xdr_wrapstring;
 131                 local = rpcbproc_getversaddr_4_local;
 132                 break;
 133
 134         case RPCBPROC_DUMP:
 135 #ifdef RPCBIND_DEBUG
 136                 if (debugging)
 137                         fprintf(stderr, "RPCBPROC_DUMP\n");
 138 #endif
 139                 xdr_argument = (xdrproc_t)xdr_void;
 140                 xdr_result = (xdrproc_t)xdr_rpcblist_ptr;
 141                 local = rpcbproc_dump_4_local;
 142                 break;
 143
 144         case RPCBPROC_INDIRECT:
 145 #ifdef RPCBIND_DEBUG
 146                 if (debugging)
 147                         fprintf(stderr, "RPCBPROC_INDIRECT\n");
 148 #endif
 149                 rpcbproc_callit_com(rqstp, transp, rqstp->rq_proc, RPCBVERS4);
 150                 return;
 151
 152 /*      case RPCBPROC_CALLIT: */
 153         case RPCBPROC_BCAST:
 154 #ifdef RPCBIND_DEBUG
 155                 if (debugging)
 156                         fprintf(stderr, "RPCBPROC_BCAST\n");
 157 #endif
 158                 rpcbproc_callit_com(rqstp, transp, rqstp->rq_proc, RPCBVERS4);
 159                 return;
 160
 161         case RPCBPROC_GETTIME:
 162 #ifdef RPCBIND_DEBUG
 163                 if (debugging)
 164                         fprintf(stderr, "RPCBPROC_GETTIME\n");
 165 #endif
 166                 xdr_argument = (xdrproc_t)xdr_void;
 167                 xdr_result = (xdrproc_t)xdr_u_long;
 168                 local = rpcbproc_gettime_com;
 169                 break;
 170
 171         case RPCBPROC_UADDR2TADDR:
 172 #ifdef RPCBIND_DEBUG
 173                 if (debugging)
 174                         fprintf(stderr, "RPCBPROC_UADDR2TADDR\n");
 175 #endif
 176                 xdr_argument = (xdrproc_t)xdr_wrapstring;
 177                 xdr_result = (xdrproc_t)xdr_netbuf;
 178                 local = rpcbproc_uaddr2taddr_com;
 179                 break;
 180
 181         case RPCBPROC_TADDR2UADDR:
 182 #ifdef RPCBIND_DEBUG
 183                 if (debugging)
 184                         fprintf(stderr, "RPCBPROC_TADDR2UADDR\n");
 185 #endif
 186                 xdr_argument = (xdrproc_t)xdr_netbuf;
 187                 xdr_result = (xdrproc_t)xdr_wrapstring;
 188                 local = rpcbproc_taddr2uaddr_com;
 189                 break;
 190
 191         case RPCBPROC_GETADDRLIST:
 192 #ifdef RPCBIND_DEBUG
 193                 if (debugging)
 194                         fprintf(stderr, "RPCBPROC_GETADDRLIST\n");
 195 #endif
 196                 xdr_argument = (xdrproc_t)xdr_rpcb;
 197                 xdr_result = (xdrproc_t)xdr_rpcb_entry_list_ptr;
 198                 local = rpcbproc_getaddrlist_4_local;
 199                 break;
 200
 201         case RPCBPROC_GETSTAT:
 202 #ifdef RPCBIND_DEBUG
 203                 if (debugging)
 204                         fprintf(stderr, "RPCBPROC_GETSTAT\n");
 205 #endif
 206                 xdr_argument = (xdrproc_t)xdr_void;
 207                 xdr_result = (xdrproc_t)xdr_rpcb_stat_byvers;
 208                 local = rpcbproc_getstat;
 209                 break;
 210
 211         default:
 212                 svcerr_noproc(transp);
 213                 return;
 214         }
 215         memset((char *)&argument, 0, sizeof (argument));
 216         if (!svc_getargs(transp, (xdrproc_t) xdr_argument,
 217                 (char *)&argument)) {
 218                 svcerr_decode(transp);
 219                 if (debugging)
 220                         (void) fprintf(stderr, "rpcbind: could not decode\n");
 221                 return;
 222         }
 223         if (!check_access(transp, rqstp->rq_proc, &argument, RPCBVERS4)) {
 224                 svcerr_weakauth(transp);
 225                 goto done;
 226         }
 227         result = (*local)(&argument, rqstp, transp, RPCBVERS4);
 228         if (result != NULL && !svc_sendreply(transp, (xdrproc_t) xdr_result,
 229                                                 result)) {
 230                 svcerr_systemerr(transp);
 231                 if (debugging) {
 232                         (void) fprintf(stderr, "rpcbind: svc_sendreply\n");
 233                         if (doabort) {
 234                                 rpcbind_abort();
 235                         }
 236                 }
 237         }
 238 done:
 239         if (!svc_freeargs(transp, (xdrproc_t) xdr_argument,
 240                                 (char *)&argument)) {
 241                 if (debugging) {
 242                         (void) fprintf(stderr, "unable to free arguments\n");
 243                         if (doabort) {
 244                                 rpcbind_abort();
 245                         }
 246                 }
 247         }
 248         return;
 249 }
 250
 251 /*
 252  * Lookup the mapping for a program, version and return its
 253  * address. Assuming that the caller wants the address of the
 254  * server running on the transport on which the request came.
 255  * Even if a service with a different version number is available,
 256  * it will return that address.  The client should check with an
 257  * clnt_call to verify whether the service is the one that is desired.
 258  * We also try to resolve the universal address in terms of
 259  * address of the caller.
 260  */
 261 /* ARGSUSED */
 262 static void *
 263 rpcbproc_getaddr_4_local(void *arg, struct svc_req *rqstp, SVCXPRT *transp,
 264                          rpcvers_t rpcbversnum)
 265 {
 266         RPCB *regp = (RPCB *)arg;
 267 #ifdef RPCBIND_DEBUG
 268         if (debugging) {
 269                 char *uaddr;
 270
 271                 uaddr = taddr2uaddr(rpcbind_get_conf(transp->xp_netid),
 272                             svc_getrpccaller(transp));
 273                 fprintf(stderr, "RPCB_GETADDR req for (%lu, %lu, %s) from %s: ",
 274                     (unsigned long)regp->r_prog, (unsigned long)regp->r_vers,
 275                     regp->r_netid, uaddr);
 276                 free(uaddr);
 277         }
 278 #endif
 279         return (rpcbproc_getaddr_com(regp, rqstp, transp, RPCBVERS4,
 280                                         RPCB_ALLVERS));
 281 }
 282
 283 /*
 284  * Lookup the mapping for a program, version and return its
 285  * address. Assuming that the caller wants the address of the
 286  * server running on the transport on which the request came.
 287  *
 288  * We also try to resolve the universal address in terms of
 289  * address of the caller.
 290  */
 291 /* ARGSUSED */
 292 static void *
 293 rpcbproc_getversaddr_4_local(void *arg, struct svc_req *rqstp, SVCXPRT *transp,
 294                              rpcvers_t versnum)
 295 {
 296         RPCB *regp = (RPCB *)arg;
 297 #ifdef RPCBIND_DEBUG
 298         if (debugging) {
 299                 char *uaddr;
 300
 301                 uaddr = taddr2uaddr(rpcbind_get_conf(transp->xp_netid),
 302                             svc_getrpccaller(transp));
 303                 fprintf(stderr, "RPCB_GETVERSADDR rqst for (%lu, %lu, %s)"
 304                                 " from %s : ",
 305                     (unsigned long)regp->r_prog, (unsigned long)regp->r_vers,
 306                     regp->r_netid, uaddr);
 307                 free(uaddr);
 308         }
 309 #endif
 310         return (rpcbproc_getaddr_com(regp, rqstp, transp, RPCBVERS4,
 311                                         RPCB_ONEVERS));
 312 }
 313
 314 /*
 315  * Lookup the mapping for a program, version and return the
 316  * addresses for all transports in the current transport family.
 317  * We return a merged address.
 318  */
 319 /* ARGSUSED */
 320 static void *
 321 rpcbproc_getaddrlist_4_local(void *arg, struct svc_req *rqstp, SVCXPRT *transp,
 322                              rpcvers_t versnum)
 323 {
 324         RPCB *regp = (RPCB *)arg;
 325         static rpcb_entry_list_ptr rlist;
 326         register rpcblist_ptr rbl;
 327         rpcb_entry_list_ptr rp, tail = NULL;
 328         rpcprog_t prog;
 329         rpcvers_t vers;
 330         rpcb_entry *a;
 331         struct netconfig *nconf;
 332         struct netconfig *reg_nconf;
 333         char *saddr, *maddr = NULL;
 334
 335         free_rpcb_entry_list(&rlist);
 336         prog = regp->r_prog;
 337         vers = regp->r_vers;
 338         reg_nconf = rpcbind_get_conf(transp->xp_netid);
 339         if (reg_nconf == NULL)
 340                 return (NULL);
 341         if (*(regp->r_addr) != '\0') {
 342                 saddr = regp->r_addr;
 343         } else {
 344                 saddr = NULL;
 345         }
 346 #ifdef RPCBIND_DEBUG
 347         if (debugging) {
 348                 fprintf(stderr, "r_addr: %s r_netid: %s nc_protofmly: %s\n",
 349                     regp->r_addr, regp->r_netid, reg_nconf->nc_protofmly);
 350         }
 351 #endif
 352         for (rbl = list_rbl; rbl != NULL; rbl = rbl->rpcb_next) {
 353             if ((rbl->rpcb_map.r_prog == prog) &&
 354                 (rbl->rpcb_map.r_vers == vers)) {
 355                 nconf = rpcbind_get_conf(rbl->rpcb_map.r_netid);
 356                 if (nconf == NULL)
 357                         goto fail;
 358                 if (strcmp(nconf->nc_protofmly, reg_nconf->nc_protofmly)
 359                                 != 0) {
 360                         continue;       /* not same proto family */
 361                 }
 362 #ifdef RPCBIND_DEBUG
 363                 if (debugging)
 364                         fprintf(stderr, "\tmerge with: %s\n", rbl->rpcb_map.r_addr);
 365 #endif
 366                 if ((maddr = mergeaddr(transp, rbl->rpcb_map.r_netid,
 367                                 rbl->rpcb_map.r_addr, saddr)) == NULL) {
 368 #ifdef RPCBIND_DEBUG
 369                 if (debugging)
 370                         fprintf(stderr, " FAILED\n");
 371 #endif
 372                         continue;
 373                 } else if (!maddr[0]) {
 374 #ifdef RPCBIND_DEBUG
 375         if (debugging)
 376                 fprintf(stderr, " SUCCEEDED, but port died -  maddr: nullstring\n");
 377 #endif
 378                         /* The server died. Unset this combination */
 379                         delete_prog(regp->r_prog);
 380                         free(maddr);
 381                         continue;
 382                 }
 383 #ifdef RPCBIND_DEBUG
 384                 if (debugging)
 385                         fprintf(stderr, " SUCCEEDED maddr: %s\n", maddr);
 386 #endif
 387                 /*
 388                  * Add it to rlist.
 389                  */
 390                 rp = (rpcb_entry_list_ptr)
 391                         malloc((u_int)sizeof (rpcb_entry_list));
 392                 if (rp == NULL) {
 393                         free(maddr);
 394                         goto fail;
 395                 }
 396                 a = &rp->rpcb_entry_map;
 397                 a->r_maddr = maddr;
 398                 a->r_nc_netid = nconf->nc_netid;
 399                 a->r_nc_semantics = nconf->nc_semantics;
 400                 a->r_nc_protofmly = nconf->nc_protofmly;
 401                 a->r_nc_proto = nconf->nc_proto;
 402                 rp->rpcb_entry_next = NULL;
 403                 if (rlist == NULL) {
 404                         rlist = rp;
 405                         tail = rp;
 406                 } else if (tail) {
 407                         tail->rpcb_entry_next = rp;
 408                         tail = rp;
 409                 }
 410                 rp = NULL;
 411             }
 412         }
 413 #ifdef RPCBIND_DEBUG
 414         if (debugging) {
 415                 for (rp = rlist; rp; rp = rp->rpcb_entry_next) {
 416                         fprintf(stderr, "\t%s %s\n", rp->rpcb_entry_map.r_maddr,
 417                                 rp->rpcb_entry_map.r_nc_proto);
 418                 }
 419         }
 420 #endif
 421         /*
 422          * XXX: getaddrlist info is also being stuffed into getaddr.
 423          * Perhaps wrong, but better than it not getting counted at all.
 424          */
 425         rpcbs_getaddr(RPCBVERS4 - 2, prog, vers, transp->xp_netid, maddr);
 426         return (void *)&rlist;
 427
 428 fail:   free_rpcb_entry_list(&rlist);
 429         return (NULL);
 430 }
 431
 432 /*
 433  * Free only the allocated structure, rest is all a pointer to some
 434  * other data somewhere else.
 435  */
 436 static void
 437 free_rpcb_entry_list(rpcb_entry_list_ptr *rlistp)
 438 {
 439         register rpcb_entry_list_ptr rbl, tmp;
 440
 441         for (rbl = *rlistp; rbl != NULL; ) {
 442                 tmp = rbl;
 443                 rbl = rbl->rpcb_entry_next;
 444                 free((char *)tmp->rpcb_entry_map.r_maddr);
 445                 free((char *)tmp);
 446         }
 447         *rlistp = NULL;
 448 }
 449
 450 /* ARGSUSED */
 451 static void *
 452 rpcbproc_dump_4_local(void *arg, struct svc_req *req, SVCXPRT *xprt,
 453                       rpcvers_t versnum)
 454 {
 455         return ((void *)&list_rbl);
 456 }