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