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