svc.c 13 KB

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