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 #if defined(LIBC_SCCS) && !defined(lint) 31 /*static char *sccsid = "from: @(#)svc.c 1.44 88/02/08 Copyr 1984 Sun Micro";*/ 32 /*static char *sccsid = "from: @(#)svc.c 2.4 88/08/11 4.0 RPCSRC";*/ 33 static char *rcsid = "$FreeBSD$"; 34 #endif 35 36 /* 37 * svc.c, Server-side remote procedure call interface. 38 * 39 * There are two sets of procedures here. The xprt routines are 40 * for handling transport handles. The svc routines handle the 41 * list of service routines. 42 * 43 * Copyright (C) 1984, Sun Microsystems, Inc. 44 */ 45 46 #include <string.h> 47 #include <stdlib.h> 48 #include <sys/errno.h> 49 #include <rpc/rpc.h> 50 #include <rpc/pmap_clnt.h> 51 52 static SVCXPRT **xports; 53 static int xportssize; 54 55 #define NULL_SVC ((struct svc_callout *)0) 56 #define RQCRED_SIZE 400 /* this size is excessive */ 57 58 #define max(a, b) (a > b ? a : b) 59 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 * apropriate procedure. 65 */ 66 static struct svc_callout { 67 struct svc_callout *sc_next; 68 u_long sc_prog; 69 u_long sc_vers; 70 void (*sc_dispatch)(); 71 } *svc_head; 72 73 static struct svc_callout *svc_find(); 74 75 int __svc_fdsetsize = 0; 76 fd_set *__svc_fdset = NULL; 77 78 /* *************** SVCXPRT related stuff **************** */ 79 80 /* 81 * Activate a transport handle. 82 */ 83 void 84 xprt_register(xprt) 85 SVCXPRT *xprt; 86 { 87 register int sock = xprt->xp_sock; 88 89 if (sock + 1 > __svc_fdsetsize) { 90 int bytes = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 91 fd_set *fds; 92 93 fds = (fd_set *)malloc(bytes); 94 memset(fds, 0, bytes); 95 if (__svc_fdset) { 96 memcpy(fds, __svc_fdset, howmany(__svc_fdsetsize, 97 NFDBITS) * sizeof(fd_mask)); 98 free(__svc_fdset); 99 } 100 __svc_fdset = fds; 101 __svc_fdsetsize = howmany(sock+1, NFDBITS) * NFDBITS; 102 } 103 104 if (sock < FD_SETSIZE) 105 FD_SET(sock, &svc_fdset); 106 FD_SET(sock, __svc_fdset); 107 108 if (xports == NULL || sock + 1 > xportssize) { 109 SVCXPRT **xp; 110 int size = FD_SETSIZE; 111 112 if (sock + 1 > size) 113 size = sock + 1; 114 xp = (SVCXPRT **)mem_alloc(size * sizeof(SVCXPRT *)); 115 memset(xp, 0, size * sizeof(SVCXPRT *)); 116 if (xports) { 117 memcpy(xp, xports, xportssize * sizeof(SVCXPRT *)); 118 free(xports); 119 } 120 xportssize = size; 121 xports = xp; 122 } 123 xports[sock] = xprt; 124 svc_maxfd = max(svc_maxfd, sock); 125 } 126 127 /* 128 * De-activate a transport handle. 129 */ 130 void 131 xprt_unregister(xprt) 132 SVCXPRT *xprt; 133 { 134 register int sock = xprt->xp_sock; 135 136 if (xports[sock] == xprt) { 137 xports[sock] = (SVCXPRT *)0; 138 if (sock < FD_SETSIZE) 139 FD_CLR(sock, &svc_fdset); 140 FD_CLR(sock, __svc_fdset); 141 if (sock == svc_maxfd) { 142 for (svc_maxfd--; svc_maxfd >= 0; svc_maxfd--) 143 if (xports[svc_maxfd]) 144 break; 145 } 146 /* 147 * XXX could use svc_maxfd as a hint to 148 * decrease the size of __svc_fdset 149 */ 150 } 151 } 152 153 154 /* ********************** CALLOUT list related stuff ************* */ 155 156 /* 157 * Add a service program to the callout list. 158 * The dispatch routine will be called when a rpc request for this 159 * program number comes in. 160 */ 161 bool_t 162 svc_register(xprt, prog, vers, dispatch, protocol) 163 SVCXPRT *xprt; 164 u_long prog; 165 u_long vers; 166 void (*dispatch)(); 167 int protocol; 168 { 169 struct svc_callout *prev; 170 register struct svc_callout *s; 171 172 if ((s = svc_find(prog, vers, &prev)) != NULL_SVC) { 173 if (s->sc_dispatch == dispatch) 174 goto pmap_it; /* he is registering another xptr */ 175 return (FALSE); 176 } 177 s = (struct svc_callout *)mem_alloc(sizeof(struct svc_callout)); 178 if (s == (struct svc_callout *)0) { 179 return (FALSE); 180 } 181 s->sc_prog = prog; 182 s->sc_vers = vers; 183 s->sc_dispatch = dispatch; 184 s->sc_next = svc_head; 185 svc_head = s; 186 pmap_it: 187 /* now register the information with the local binder service */ 188 if (protocol) { 189 return (pmap_set(prog, vers, protocol, xprt->xp_port)); 190 } 191 return (TRUE); 192 } 193 194 /* 195 * Remove a service program from the callout list. 196 */ 197 void 198 svc_unregister(prog, vers) 199 u_long prog; 200 u_long vers; 201 { 202 struct svc_callout *prev; 203 register struct svc_callout *s; 204 205 if ((s = svc_find(prog, vers, &prev)) == NULL_SVC) 206 return; 207 if (prev == NULL_SVC) { 208 svc_head = s->sc_next; 209 } else { 210 prev->sc_next = s->sc_next; 211 } 212 s->sc_next = NULL_SVC; 213 mem_free((char *) s, (u_int) sizeof(struct svc_callout)); 214 /* now unregister the information with the local binder service */ 215 (void)pmap_unset(prog, vers); 216 } 217 218 /* 219 * Search the callout list for a program number, return the callout 220 * struct. 221 */ 222 static struct svc_callout * 223 svc_find(prog, vers, prev) 224 u_long prog; 225 u_long vers; 226 struct svc_callout **prev; 227 { 228 register struct svc_callout *s, *p; 229 230 p = NULL_SVC; 231 for (s = svc_head; s != NULL_SVC; s = s->sc_next) { 232 if ((s->sc_prog == prog) && (s->sc_vers == vers)) 233 goto done; 234 p = s; 235 } 236 done: 237 *prev = p; 238 return (s); 239 } 240 241 /* ******************* REPLY GENERATION ROUTINES ************ */ 242 243 /* 244 * Send a reply to an rpc request 245 */ 246 bool_t 247 svc_sendreply(xprt, xdr_results, xdr_location) 248 register SVCXPRT *xprt; 249 xdrproc_t xdr_results; 250 caddr_t xdr_location; 251 { 252 struct rpc_msg rply; 253 254 rply.rm_direction = REPLY; 255 rply.rm_reply.rp_stat = MSG_ACCEPTED; 256 rply.acpted_rply.ar_verf = xprt->xp_verf; 257 rply.acpted_rply.ar_stat = SUCCESS; 258 rply.acpted_rply.ar_results.where = xdr_location; 259 rply.acpted_rply.ar_results.proc = xdr_results; 260 return (SVC_REPLY(xprt, &rply)); 261 } 262 263 /* 264 * No procedure error reply 265 */ 266 void 267 svcerr_noproc(xprt) 268 register SVCXPRT *xprt; 269 { 270 struct rpc_msg rply; 271 272 rply.rm_direction = REPLY; 273 rply.rm_reply.rp_stat = MSG_ACCEPTED; 274 rply.acpted_rply.ar_verf = xprt->xp_verf; 275 rply.acpted_rply.ar_stat = PROC_UNAVAIL; 276 SVC_REPLY(xprt, &rply); 277 } 278 279 /* 280 * Can't decode args error reply 281 */ 282 void 283 svcerr_decode(xprt) 284 register SVCXPRT *xprt; 285 { 286 struct rpc_msg rply; 287 288 rply.rm_direction = REPLY; 289 rply.rm_reply.rp_stat = MSG_ACCEPTED; 290 rply.acpted_rply.ar_verf = xprt->xp_verf; 291 rply.acpted_rply.ar_stat = GARBAGE_ARGS; 292 SVC_REPLY(xprt, &rply); 293 } 294 295 /* 296 * Some system error 297 */ 298 void 299 svcerr_systemerr(xprt) 300 register SVCXPRT *xprt; 301 { 302 struct rpc_msg rply; 303 304 rply.rm_direction = REPLY; 305 rply.rm_reply.rp_stat = MSG_ACCEPTED; 306 rply.acpted_rply.ar_verf = xprt->xp_verf; 307 rply.acpted_rply.ar_stat = SYSTEM_ERR; 308 SVC_REPLY(xprt, &rply); 309 } 310 311 /* 312 * Authentication error reply 313 */ 314 void 315 svcerr_auth(xprt, why) 316 SVCXPRT *xprt; 317 enum auth_stat why; 318 { 319 struct rpc_msg rply; 320 321 rply.rm_direction = REPLY; 322 rply.rm_reply.rp_stat = MSG_DENIED; 323 rply.rjcted_rply.rj_stat = AUTH_ERROR; 324 rply.rjcted_rply.rj_why = why; 325 SVC_REPLY(xprt, &rply); 326 } 327 328 /* 329 * Auth too weak error reply 330 */ 331 void 332 svcerr_weakauth(xprt) 333 SVCXPRT *xprt; 334 { 335 336 svcerr_auth(xprt, AUTH_TOOWEAK); 337 } 338 339 /* 340 * Program unavailable error reply 341 */ 342 void 343 svcerr_noprog(xprt) 344 register SVCXPRT *xprt; 345 { 346 struct rpc_msg rply; 347 348 rply.rm_direction = REPLY; 349 rply.rm_reply.rp_stat = MSG_ACCEPTED; 350 rply.acpted_rply.ar_verf = xprt->xp_verf; 351 rply.acpted_rply.ar_stat = PROG_UNAVAIL; 352 SVC_REPLY(xprt, &rply); 353 } 354 355 /* 356 * Program version mismatch error reply 357 */ 358 void 359 svcerr_progvers(xprt, low_vers, high_vers) 360 register SVCXPRT *xprt; 361 u_long low_vers; 362 u_long high_vers; 363 { 364 struct rpc_msg rply; 365 366 rply.rm_direction = REPLY; 367 rply.rm_reply.rp_stat = MSG_ACCEPTED; 368 rply.acpted_rply.ar_verf = xprt->xp_verf; 369 rply.acpted_rply.ar_stat = PROG_MISMATCH; 370 rply.acpted_rply.ar_vers.low = low_vers; 371 rply.acpted_rply.ar_vers.high = high_vers; 372 SVC_REPLY(xprt, &rply); 373 } 374 375 /* ******************* SERVER INPUT STUFF ******************* */ 376 377 /* 378 * Get server side input from some transport. 379 * 380 * Statement of authentication parameters management: 381 * This function owns and manages all authentication parameters, specifically 382 * the "raw" parameters (msg.rm_call.cb_cred and msg.rm_call.cb_verf) and 383 * the "cooked" credentials (rqst->rq_clntcred). 384 * However, this function does not know the structure of the cooked 385 * credentials, so it make the following assumptions: 386 * a) the structure is contiguous (no pointers), and 387 * b) the cred structure size does not exceed RQCRED_SIZE bytes. 388 * In all events, all three parameters are freed upon exit from this routine. 389 * The storage is trivially management on the call stack in user land, but 390 * is mallocated in kernel land. 391 */ 392 393 void 394 svc_getreq(rdfds) 395 int rdfds; 396 { 397 fd_set readfds; 398 399 FD_ZERO(&readfds); 400 readfds.fds_bits[0] = rdfds; 401 svc_getreqset(&readfds); 402 } 403 404 void 405 svc_getreqset(readfds) 406 fd_set *readfds; 407 { 408 svc_getreqset2(readfds, FD_SETSIZE); 409 } 410 411 void 412 svc_getreqset2(readfds, width) 413 fd_set *readfds; 414 int width; 415 { 416 enum xprt_stat stat; 417 struct rpc_msg msg; 418 int prog_found; 419 u_long low_vers; 420 u_long high_vers; 421 struct svc_req r; 422 register SVCXPRT *xprt; 423 register int bit; 424 register int sock; 425 register fd_mask mask, *maskp; 426 char cred_area[2*MAX_AUTH_BYTES + RQCRED_SIZE]; 427 msg.rm_call.cb_cred.oa_base = cred_area; 428 msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]); 429 r.rq_clntcred = &(cred_area[2*MAX_AUTH_BYTES]); 430 431 432 maskp = readfds->fds_bits; 433 for (sock = 0; sock < width; sock += NFDBITS) { 434 for (mask = *maskp++; (bit = ffs(mask)); mask ^= (1 << (bit - 1))) { 435 /* sock has input waiting */ 436 xprt = xports[sock + bit - 1]; 437 if (xprt == NULL) 438 /* But do we control sock? */ 439 continue; 440 /* now receive msgs from xprtprt (support batch calls) */ 441 do { 442 if (SVC_RECV(xprt, &msg)) { 443 444 /* now find the exported program and call it */ 445 register struct svc_callout *s; 446 enum auth_stat why; 447 448 r.rq_xprt = xprt; 449 r.rq_prog = msg.rm_call.cb_prog; 450 r.rq_vers = msg.rm_call.cb_vers; 451 r.rq_proc = msg.rm_call.cb_proc; 452 r.rq_cred = msg.rm_call.cb_cred; 453 /* first authenticate the message */ 454 if ((why= _authenticate(&r, &msg)) != AUTH_OK) { 455 svcerr_auth(xprt, why); 456 goto call_done; 457 } 458 /* now match message with a registered service*/ 459 prog_found = FALSE; 460 low_vers = (u_long) - 1; 461 high_vers = 0; 462 for (s = svc_head; s != NULL_SVC; s = s->sc_next) { 463 if (s->sc_prog == r.rq_prog) { 464 if (s->sc_vers == r.rq_vers) { 465 (*s->sc_dispatch)(&r, xprt); 466 goto call_done; 467 } /* found correct version */ 468 prog_found = TRUE; 469 if (s->sc_vers < low_vers) 470 low_vers = s->sc_vers; 471 if (s->sc_vers > high_vers) 472 high_vers = s->sc_vers; 473 } /* found correct program */ 474 } 475 /* 476 * if we got here, the program or version 477 * is not served ... 478 */ 479 if (prog_found) 480 svcerr_progvers(xprt, 481 low_vers, high_vers); 482 else 483 svcerr_noprog(xprt); 484 /* Fall through to ... */ 485 } 486 call_done: 487 if ((stat = SVC_STAT(xprt)) == XPRT_DIED){ 488 SVC_DESTROY(xprt); 489 break; 490 } 491 } while (stat == XPRT_MOREREQS); 492 } 493 } 494 } 495