svc.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.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  */
  29 /*
  30  * svc.c, Server-side remote procedure call interface.
  31  *
  32  * There are two sets of procedures here.  The xprt routines are
  33  * for handling transport handles.  The svc routines handle the
  34  * list of service routines.
  35  *
  36  * Copyright (C) 1984, Sun Microsystems, Inc.
  37  */
  38
  39 #define __FORCE_GLIBC
  40 #include <features.h>
  41
  42 #include <errno.h>
  43 #include <unistd.h>
  44 #include "rpc_private.h"
  45 #include <rpc/svc.h>
  46 #include <rpc/pmap_clnt.h>
  47 #include <poll.h>
  48
  49 /* used by svc_[max_]pollfd */
  50 /* used by svc_fdset */
  51
  52 #ifdef __UCLIBC_HAS_THREADS__
  53 #define xports (*(SVCXPRT ***)&RPC_THREAD_VARIABLE(svc_xports_s))
  54 #else
  55 static SVCXPRT **xports;
  56 #endif
  57
  58 #define NULL_SVC ((struct svc_callout *)0)
  59 #define RQCRED_SIZE     400     /* this size is excessive */
  60
  61 /* The services list
  62    Each entry represents a set of procedures (an rpc program).
  63    The dispatch routine takes request structs and runs the
  64    appropriate procedure. */
  65 struct svc_callout {
  66   struct svc_callout *sc_next;
  67   rpcprog_t sc_prog;
  68   rpcvers_t sc_vers;
  69   void (*sc_dispatch) (struct svc_req *, SVCXPRT *);
  70 };
  71 #ifdef __UCLIBC_HAS_THREADS__
  72 #define svc_head (*(struct svc_callout **)&RPC_THREAD_VARIABLE(svc_head_s))
  73 #else
  74 static struct svc_callout *svc_head;
  75 #endif
  76
  77 /* ***************  SVCXPRT related stuff **************** */
  78
  79 /* Activate a transport handle. */
  80 void
  81 xprt_register (SVCXPRT *xprt)
  82 {
  83   register int sock = xprt->xp_sock;
  84   register int i;
  85
  86   if (xports == NULL)
  87     {
  88       xports = (SVCXPRT **) malloc (_rpc_dtablesize () * sizeof (SVCXPRT *));
  89       if (xports == NULL) /* Don´t add handle */
  90         return;
  91     }
  92
  93   if (sock < _rpc_dtablesize ())
  94     {
  95       xports[sock] = xprt;
  96       if (sock < FD_SETSIZE)
  97         FD_SET (sock, &svc_fdset);
  98
  99       /* Check if we have an empty slot */
 100       for (i = 0; i < svc_max_pollfd; ++i)
 101         if (svc_pollfd[i].fd == -1)
 102           {
 103             svc_pollfd[i].fd = sock;
 104             svc_pollfd[i].events = (POLLIN | POLLPRI |
 105                                     POLLRDNORM | POLLRDBAND);
 106             return;
 107           }
 108
 109       ++svc_max_pollfd;
 110       svc_pollfd = realloc (svc_pollfd,
 111                             sizeof (struct pollfd) * svc_max_pollfd);
 112       if (svc_pollfd == NULL) /* Out of memory */
 113         return;
 114
 115       svc_pollfd[svc_max_pollfd - 1].fd = sock;
 116       svc_pollfd[svc_max_pollfd - 1].events = (POLLIN | POLLPRI |
 117                                                POLLRDNORM | POLLRDBAND);
 118     }
 119 }
 120 libc_hidden_def(xprt_register)
 121
 122 /* De-activate a transport handle. */
 123 void
 124 xprt_unregister (SVCXPRT *xprt)
 125 {
 126   register int sock = xprt->xp_sock;
 127   register int i;
 128
 129   if ((sock < _rpc_dtablesize ()) && (xports[sock] == xprt))
 130     {
 131       xports[sock] = (SVCXPRT *) 0;
 132
 133       if (sock < FD_SETSIZE)
 134         FD_CLR (sock, &svc_fdset);
 135
 136       for (i = 0; i < svc_max_pollfd; ++i)
 137         if (svc_pollfd[i].fd == sock)
 138           svc_pollfd[i].fd = -1;
 139     }
 140 }
 141 libc_hidden_def(xprt_unregister)
 142
 143
 144 /* ********************** CALLOUT list related stuff ************* */
 145
 146 /* Search the callout list for a program number, return the callout
 147    struct. */
 148 static struct svc_callout *
 149 svc_find (rpcprog_t prog, rpcvers_t vers, struct svc_callout **prev)
 150 {
 151   register struct svc_callout *s, *p;
 152
 153   p = NULL_SVC;
 154   for (s = svc_head; s != NULL_SVC; s = s->sc_next)
 155     {
 156       if ((s->sc_prog == prog) && (s->sc_vers == vers))
 157         goto done;
 158       p = s;
 159     }
 160 done:
 161   *prev = p;
 162   return s;
 163 }
 164
 165 /* Add a service program to the callout list.
 166    The dispatch routine will be called when a rpc request for this
 167    program number comes in. */
 168 bool_t
 169 svc_register (SVCXPRT * xprt, rpcprog_t prog, rpcvers_t vers,
 170               void (*dispatch) (struct svc_req *, SVCXPRT *),
 171               rpcproc_t protocol)
 172 {
 173   struct svc_callout *prev;
 174   register struct svc_callout *s;
 175
 176   if ((s = svc_find (prog, vers, &prev)) != NULL_SVC)
 177     {
 178       if (s->sc_dispatch == dispatch)
 179         goto pmap_it;           /* he is registering another xptr */
 180       return FALSE;
 181     }
 182   s = (struct svc_callout *) mem_alloc (sizeof (struct svc_callout));
 183   if (s == (struct svc_callout *) 0)
 184     return FALSE;
 185
 186   s->sc_prog = prog;
 187   s->sc_vers = vers;
 188   s->sc_dispatch = dispatch;
 189   s->sc_next = svc_head;
 190   svc_head = s;
 191
 192 pmap_it:
 193   /* now register the information with the local binder service */
 194   if (protocol)
 195     return pmap_set (prog, vers, protocol, xprt->xp_port);
 196
 197   return TRUE;
 198 }
 199 libc_hidden_def(svc_register)
 200
 201 /* Remove a service program from the callout list. */
 202 void
 203 svc_unregister (rpcprog_t prog, rpcvers_t vers)
 204 {
 205   struct svc_callout *prev;
 206   register struct svc_callout *s;
 207
 208   if ((s = svc_find (prog, vers, &prev)) == NULL_SVC)
 209     return;
 210
 211   if (prev == NULL_SVC)
 212     svc_head = s->sc_next;
 213   else
 214     prev->sc_next = s->sc_next;
 215
 216   s->sc_next = NULL_SVC;
 217   mem_free ((char *) s, (u_int) sizeof (struct svc_callout));
 218   /* now unregister the information with the local binder service */
 219   pmap_unset (prog, vers);
 220 }
 221 libc_hidden_def(svc_unregister)
 222
 223 /* ******************* REPLY GENERATION ROUTINES  ************ */
 224
 225 /* Send a reply to an rpc request */
 226 bool_t
 227 svc_sendreply (register SVCXPRT *xprt, xdrproc_t xdr_results,
 228                caddr_t xdr_location)
 229 {
 230   struct rpc_msg rply;
 231
 232   rply.rm_direction = REPLY;
 233   rply.rm_reply.rp_stat = MSG_ACCEPTED;
 234   rply.acpted_rply.ar_verf = xprt->xp_verf;
 235   rply.acpted_rply.ar_stat = SUCCESS;
 236   rply.acpted_rply.ar_results.where = xdr_location;
 237   rply.acpted_rply.ar_results.proc = xdr_results;
 238   return SVC_REPLY (xprt, &rply);
 239 }
 240 libc_hidden_def(svc_sendreply)
 241
 242 /* No procedure error reply */
 243 void
 244 svcerr_noproc (register SVCXPRT *xprt)
 245 {
 246   struct rpc_msg rply;
 247
 248   rply.rm_direction = REPLY;
 249   rply.rm_reply.rp_stat = MSG_ACCEPTED;
 250   rply.acpted_rply.ar_verf = xprt->xp_verf;
 251   rply.acpted_rply.ar_stat = PROC_UNAVAIL;
 252   SVC_REPLY (xprt, &rply);
 253 }
 254
 255 /* Can't decode args error reply */
 256 void
 257 svcerr_decode (register SVCXPRT *xprt)
 258 {
 259   struct rpc_msg rply;
 260
 261   rply.rm_direction = REPLY;
 262   rply.rm_reply.rp_stat = MSG_ACCEPTED;
 263   rply.acpted_rply.ar_verf = xprt->xp_verf;
 264   rply.acpted_rply.ar_stat = GARBAGE_ARGS;
 265   SVC_REPLY (xprt, &rply);
 266 }
 267 libc_hidden_def(svcerr_decode)
 268
 269 /* Some system error */
 270 void
 271 svcerr_systemerr (register SVCXPRT *xprt)
 272 {
 273   struct rpc_msg rply;
 274
 275   rply.rm_direction = REPLY;
 276   rply.rm_reply.rp_stat = MSG_ACCEPTED;
 277   rply.acpted_rply.ar_verf = xprt->xp_verf;
 278   rply.acpted_rply.ar_stat = SYSTEM_ERR;
 279   SVC_REPLY (xprt, &rply);
 280 }
 281
 282 /* Authentication error reply */
 283 void
 284 svcerr_auth (SVCXPRT *xprt, enum auth_stat why)
 285 {
 286   struct rpc_msg rply;
 287
 288   rply.rm_direction = REPLY;
 289   rply.rm_reply.rp_stat = MSG_DENIED;
 290   rply.rjcted_rply.rj_stat = AUTH_ERROR;
 291   rply.rjcted_rply.rj_why = why;
 292   SVC_REPLY (xprt, &rply);
 293 }
 294 libc_hidden_def(svcerr_auth)
 295
 296 /* Auth too weak error reply */
 297 void
 298 svcerr_weakauth (SVCXPRT *xprt)
 299 {
 300   svcerr_auth (xprt, AUTH_TOOWEAK);
 301 }
 302
 303 /* Program unavailable error reply */
 304 void
 305 svcerr_noprog (register SVCXPRT *xprt)
 306 {
 307   struct rpc_msg rply;
 308
 309   rply.rm_direction = REPLY;
 310   rply.rm_reply.rp_stat = MSG_ACCEPTED;
 311   rply.acpted_rply.ar_verf = xprt->xp_verf;
 312   rply.acpted_rply.ar_stat = PROG_UNAVAIL;
 313   SVC_REPLY (xprt, &rply);
 314 }
 315 libc_hidden_def(svcerr_noprog)
 316
 317 /* Program version mismatch error reply */
 318 void
 319 svcerr_progvers (register SVCXPRT *xprt, rpcvers_t low_vers,
 320                  rpcvers_t high_vers)
 321 {
 322   struct rpc_msg rply;
 323
 324   rply.rm_direction = REPLY;
 325   rply.rm_reply.rp_stat = MSG_ACCEPTED;
 326   rply.acpted_rply.ar_verf = xprt->xp_verf;
 327   rply.acpted_rply.ar_stat = PROG_MISMATCH;
 328   rply.acpted_rply.ar_vers.low = low_vers;
 329   rply.acpted_rply.ar_vers.high = high_vers;
 330   SVC_REPLY (xprt, &rply);
 331 }
 332 libc_hidden_def(svcerr_progvers)
 333
 334 /* ******************* SERVER INPUT STUFF ******************* */
 335
 336 /*
 337  * Get server side input from some transport.
 338  *
 339  * Statement of authentication parameters management:
 340  * This function owns and manages all authentication parameters, specifically
 341  * the "raw" parameters (msg.rm_call.cb_cred and msg.rm_call.cb_verf) and
 342  * the "cooked" credentials (rqst->rq_clntcred).
 343  * However, this function does not know the structure of the cooked
 344  * credentials, so it make the following assumptions:
 345  *   a) the structure is contiguous (no pointers), and
 346  *   b) the cred structure size does not exceed RQCRED_SIZE bytes.
 347  * In all events, all three parameters are freed upon exit from this routine.
 348  * The storage is trivially management on the call stack in user land, but
 349  * is mallocated in kernel land.
 350  */
 351
 352 void
 353 svc_getreq_common (const int fd)
 354 {
 355   enum xprt_stat stat;
 356   struct rpc_msg msg;
 357   register SVCXPRT *xprt;
 358   char cred_area[2 * MAX_AUTH_BYTES + RQCRED_SIZE];
 359   msg.rm_call.cb_cred.oa_base = cred_area;
 360   msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]);
 361
 362   xprt = xports[fd];
 363   /* Do we control fd? */
 364   if (xprt == NULL)
 365      return;
 366
 367   /* now receive msgs from xprtprt (support batch calls) */
 368   do
 369     {
 370       if (SVC_RECV (xprt, &msg))
 371         {
 372           /* now find the exported program and call it */
 373           struct svc_callout *s;
 374           struct svc_req r;
 375           enum auth_stat why;
 376           rpcvers_t low_vers;
 377           rpcvers_t high_vers;
 378           int prog_found;
 379
 380           r.rq_clntcred = &(cred_area[2 * MAX_AUTH_BYTES]);
 381           r.rq_xprt = xprt;
 382           r.rq_prog = msg.rm_call.cb_prog;
 383           r.rq_vers = msg.rm_call.cb_vers;
 384           r.rq_proc = msg.rm_call.cb_proc;
 385           r.rq_cred = msg.rm_call.cb_cred;
 386
 387           /* first authenticate the message */
 388           /* Check for null flavor and bypass these calls if possible */
 389
 390           if (msg.rm_call.cb_cred.oa_flavor == AUTH_NULL)
 391             {
 392               r.rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor;
 393               r.rq_xprt->xp_verf.oa_length = 0;
 394             }
 395           else if ((why = _authenticate (&r, &msg)) != AUTH_OK)
 396             {
 397               svcerr_auth (xprt, why);
 398               goto call_done;
 399             }
 400
 401           /* now match message with a registered service */
 402           prog_found = FALSE;
 403           low_vers = 0 - 1;
 404           high_vers = 0;
 405
 406           for (s = svc_head; s != NULL_SVC; s = s->sc_next)
 407             {
 408               if (s->sc_prog == r.rq_prog)
 409                 {
 410                   if (s->sc_vers == r.rq_vers)
 411                     {
 412                       (*s->sc_dispatch) (&r, xprt);
 413                       goto call_done;
 414                     }
 415                   /* found correct version */
 416                   prog_found = TRUE;
 417                   if (s->sc_vers < low_vers)
 418                     low_vers = s->sc_vers;
 419                   if (s->sc_vers > high_vers)
 420                     high_vers = s->sc_vers;
 421                 }
 422               /* found correct program */
 423             }
 424           /* if we got here, the program or version
 425              is not served ... */
 426           if (prog_found)
 427             svcerr_progvers (xprt, low_vers, high_vers);
 428           else
 429             svcerr_noprog (xprt);
 430           /* Fall through to ... */
 431         }
 432     call_done:
 433       if ((stat = SVC_STAT (xprt)) == XPRT_DIED)
 434         {
 435           SVC_DESTROY (xprt);
 436           break;
 437         }
 438     }
 439   while (stat == XPRT_MOREREQS);
 440 }
 441 libc_hidden_def(svc_getreq_common)
 442
 443 void
 444 svc_getreqset (fd_set *readfds)
 445 {
 446   register u_int32_t mask;
 447   register u_int32_t *maskp;
 448   register int setsize;
 449   register int sock;
 450   register int bit;
 451
 452   setsize = _rpc_dtablesize ();
 453   maskp = (u_int32_t *) readfds->fds_bits;
 454   for (sock = 0; sock < setsize; sock += 32)
 455     for (mask = *maskp++; (bit = ffs (mask)); mask ^= (1 << (bit - 1)))
 456       svc_getreq_common (sock + bit - 1);
 457 }
 458 libc_hidden_def(svc_getreqset)
 459
 460 void
 461 svc_getreq (int rdfds)
 462 {
 463   fd_set readfds;
 464
 465   FD_ZERO (&readfds);
 466   readfds.fds_bits[0] = rdfds;
 467   svc_getreqset (&readfds);
 468 }
 469 libc_hidden_def(svc_getreq)
 470
 471 void
 472 svc_getreq_poll (struct pollfd *pfdp, int pollretval)
 473 {
 474   register int i;
 475   register int fds_found;
 476
 477   for (i = fds_found = 0; i < svc_max_pollfd && fds_found < pollretval; ++i)
 478     {
 479       register struct pollfd *p = &pfdp[i];
 480
 481       if (p->fd != -1 && p->revents)
 482         {
 483           /* fd has input waiting */
 484           ++fds_found;
 485
 486           if (p->revents & POLLNVAL)
 487             xprt_unregister (xports[p->fd]);
 488           else
 489             svc_getreq_common (p->fd);
 490         }
 491     }
 492 }
 493 libc_hidden_def(svc_getreq_poll)
 494
 495 #ifdef __UCLIBC_HAS_THREADS__
 496
 497 void attribute_hidden __rpc_thread_svc_cleanup (void)
 498 {
 499   struct svc_callout *svcp;
 500
 501   while ((svcp = svc_head) != NULL)
 502     svc_unregister (svcp->sc_prog, svcp->sc_vers);
 503 }
 504
 505 #endif /* __UCLIBC_HAS_THREADS__ */