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 = "$Id: svc.c,v 1.1 1993/10/27 05:40:54 paul Exp $"; 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 <sys/errno.h> 47 #include <rpc/rpc.h> 48 #include <rpc/pmap_clnt.h> 49 50 extern int errno; 51 52 #ifdef FD_SETSIZE 53 static SVCXPRT **xports; 54 #else 55 #define NOFILE 32 56 57 static SVCXPRT *xports[NOFILE]; 58 #endif /* def FD_SETSIZE */ 59 60 #define NULL_SVC ((struct svc_callout *)0) 61 #define RQCRED_SIZE 400 /* this size is excessive */ 62 63 /* 64 * The services list 65 * Each entry represents a set of procedures (an rpc program). 66 * The dispatch routine takes request structs and runs the 67 * apropriate procedure. 68 */ 69 static struct svc_callout { 70 struct svc_callout *sc_next; 71 u_long sc_prog; 72 u_long sc_vers; 73 void (*sc_dispatch)(); 74 } *svc_head; 75 76 static struct svc_callout *svc_find(); 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 #ifdef FD_SETSIZE 90 if (xports == NULL) { 91 xports = (SVCXPRT **) 92 mem_alloc(FD_SETSIZE * sizeof(SVCXPRT *)); 93 } 94 if (sock < _rpc_dtablesize()) { 95 xports[sock] = xprt; 96 FD_SET(sock, &svc_fdset); 97 } 98 #else 99 if (sock < NOFILE) { 100 xports[sock] = xprt; 101 svc_fds |= (1 << sock); 102 } 103 #endif /* def FD_SETSIZE */ 104 105 } 106 107 /* 108 * De-activate a transport handle. 109 */ 110 void 111 xprt_unregister(xprt) 112 SVCXPRT *xprt; 113 { 114 register int sock = xprt->xp_sock; 115 116 #ifdef FD_SETSIZE 117 if ((sock < _rpc_dtablesize()) && (xports[sock] == xprt)) { 118 xports[sock] = (SVCXPRT *)0; 119 FD_CLR(sock, &svc_fdset); 120 } 121 #else 122 if ((sock < NOFILE) && (xports[sock] == xprt)) { 123 xports[sock] = (SVCXPRT *)0; 124 svc_fds &= ~(1 << sock); 125 } 126 #endif /* def FD_SETSIZE */ 127 } 128 129 130 /* ********************** CALLOUT list related stuff ************* */ 131 132 /* 133 * Add a service program to the callout list. 134 * The dispatch routine will be called when a rpc request for this 135 * program number comes in. 136 */ 137 bool_t 138 svc_register(xprt, prog, vers, dispatch, protocol) 139 SVCXPRT *xprt; 140 u_long prog; 141 u_long vers; 142 void (*dispatch)(); 143 int protocol; 144 { 145 struct svc_callout *prev; 146 register struct svc_callout *s; 147 148 if ((s = svc_find(prog, vers, &prev)) != NULL_SVC) { 149 if (s->sc_dispatch == dispatch) 150 goto pmap_it; /* he is registering another xptr */ 151 return (FALSE); 152 } 153 s = (struct svc_callout *)mem_alloc(sizeof(struct svc_callout)); 154 if (s == (struct svc_callout *)0) { 155 return (FALSE); 156 } 157 s->sc_prog = prog; 158 s->sc_vers = vers; 159 s->sc_dispatch = dispatch; 160 s->sc_next = svc_head; 161 svc_head = s; 162 pmap_it: 163 /* now register the information with the local binder service */ 164 if (protocol) { 165 return (pmap_set(prog, vers, protocol, xprt->xp_port)); 166 } 167 return (TRUE); 168 } 169 170 /* 171 * Remove a service program from the callout list. 172 */ 173 void 174 svc_unregister(prog, vers) 175 u_long prog; 176 u_long vers; 177 { 178 struct svc_callout *prev; 179 register struct svc_callout *s; 180 181 if ((s = svc_find(prog, vers, &prev)) == NULL_SVC) 182 return; 183 if (prev == NULL_SVC) { 184 svc_head = s->sc_next; 185 } else { 186 prev->sc_next = s->sc_next; 187 } 188 s->sc_next = NULL_SVC; 189 mem_free((char *) s, (u_int) sizeof(struct svc_callout)); 190 /* now unregister the information with the local binder service */ 191 (void)pmap_unset(prog, vers); 192 } 193 194 /* 195 * Search the callout list for a program number, return the callout 196 * struct. 197 */ 198 static struct svc_callout * 199 svc_find(prog, vers, prev) 200 u_long prog; 201 u_long vers; 202 struct svc_callout **prev; 203 { 204 register struct svc_callout *s, *p; 205 206 p = NULL_SVC; 207 for (s = svc_head; s != NULL_SVC; s = s->sc_next) { 208 if ((s->sc_prog == prog) && (s->sc_vers == vers)) 209 goto done; 210 p = s; 211 } 212 done: 213 *prev = p; 214 return (s); 215 } 216 217 /* ******************* REPLY GENERATION ROUTINES ************ */ 218 219 /* 220 * Send a reply to an rpc request 221 */ 222 bool_t 223 svc_sendreply(xprt, xdr_results, xdr_location) 224 register SVCXPRT *xprt; 225 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 } 238 239 /* 240 * No procedure error reply 241 */ 242 void 243 svcerr_noproc(xprt) 244 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 /* 256 * Can't decode args error reply 257 */ 258 void 259 svcerr_decode(xprt) 260 register SVCXPRT *xprt; 261 { 262 struct rpc_msg rply; 263 264 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 = GARBAGE_ARGS; 268 SVC_REPLY(xprt, &rply); 269 } 270 271 /* 272 * Some system error 273 */ 274 void 275 svcerr_systemerr(xprt) 276 register SVCXPRT *xprt; 277 { 278 struct rpc_msg rply; 279 280 rply.rm_direction = REPLY; 281 rply.rm_reply.rp_stat = MSG_ACCEPTED; 282 rply.acpted_rply.ar_verf = xprt->xp_verf; 283 rply.acpted_rply.ar_stat = SYSTEM_ERR; 284 SVC_REPLY(xprt, &rply); 285 } 286 287 /* 288 * Authentication error reply 289 */ 290 void 291 svcerr_auth(xprt, why) 292 SVCXPRT *xprt; 293 enum auth_stat why; 294 { 295 struct rpc_msg rply; 296 297 rply.rm_direction = REPLY; 298 rply.rm_reply.rp_stat = MSG_DENIED; 299 rply.rjcted_rply.rj_stat = AUTH_ERROR; 300 rply.rjcted_rply.rj_why = why; 301 SVC_REPLY(xprt, &rply); 302 } 303 304 /* 305 * Auth too weak error reply 306 */ 307 void 308 svcerr_weakauth(xprt) 309 SVCXPRT *xprt; 310 { 311 312 svcerr_auth(xprt, AUTH_TOOWEAK); 313 } 314 315 /* 316 * Program unavailable error reply 317 */ 318 void 319 svcerr_noprog(xprt) 320 register SVCXPRT *xprt; 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_UNAVAIL; 328 SVC_REPLY(xprt, &rply); 329 } 330 331 /* 332 * Program version mismatch error reply 333 */ 334 void 335 svcerr_progvers(xprt, low_vers, high_vers) 336 register SVCXPRT *xprt; 337 u_long low_vers; 338 u_long high_vers; 339 { 340 struct rpc_msg rply; 341 342 rply.rm_direction = REPLY; 343 rply.rm_reply.rp_stat = MSG_ACCEPTED; 344 rply.acpted_rply.ar_verf = xprt->xp_verf; 345 rply.acpted_rply.ar_stat = PROG_MISMATCH; 346 rply.acpted_rply.ar_vers.low = low_vers; 347 rply.acpted_rply.ar_vers.high = high_vers; 348 SVC_REPLY(xprt, &rply); 349 } 350 351 /* ******************* SERVER INPUT STUFF ******************* */ 352 353 /* 354 * Get server side input from some transport. 355 * 356 * Statement of authentication parameters management: 357 * This function owns and manages all authentication parameters, specifically 358 * the "raw" parameters (msg.rm_call.cb_cred and msg.rm_call.cb_verf) and 359 * the "cooked" credentials (rqst->rq_clntcred). 360 * However, this function does not know the structure of the cooked 361 * credentials, so it make the following assumptions: 362 * a) the structure is contiguous (no pointers), and 363 * b) the cred structure size does not exceed RQCRED_SIZE bytes. 364 * In all events, all three parameters are freed upon exit from this routine. 365 * The storage is trivially management on the call stack in user land, but 366 * is mallocated in kernel land. 367 */ 368 369 void 370 svc_getreq(rdfds) 371 int rdfds; 372 { 373 #ifdef FD_SETSIZE 374 fd_set readfds; 375 376 FD_ZERO(&readfds); 377 readfds.fds_bits[0] = rdfds; 378 svc_getreqset(&readfds); 379 #else 380 int readfds = rdfds & svc_fds; 381 382 svc_getreqset(&readfds); 383 #endif /* def FD_SETSIZE */ 384 } 385 386 void 387 svc_getreqset(readfds) 388 #ifdef FD_SETSIZE 389 fd_set *readfds; 390 { 391 #else 392 int *readfds; 393 { 394 int readfds_local = *readfds; 395 #endif /* def FD_SETSIZE */ 396 enum xprt_stat stat; 397 struct rpc_msg msg; 398 int prog_found; 399 u_long low_vers; 400 u_long high_vers; 401 struct svc_req r; 402 register SVCXPRT *xprt; 403 register u_long mask; 404 register int bit; 405 register u_long *maskp; 406 register int setsize; 407 register int sock; 408 char cred_area[2*MAX_AUTH_BYTES + RQCRED_SIZE]; 409 msg.rm_call.cb_cred.oa_base = cred_area; 410 msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]); 411 r.rq_clntcred = &(cred_area[2*MAX_AUTH_BYTES]); 412 413 414 #ifdef FD_SETSIZE 415 setsize = _rpc_dtablesize(); 416 maskp = (u_long *)readfds->fds_bits; 417 for (sock = 0; sock < setsize; sock += NFDBITS) { 418 for (mask = *maskp++; bit = ffs(mask); mask ^= (1 << (bit - 1))) { 419 /* sock has input waiting */ 420 xprt = xports[sock + bit - 1]; 421 #else 422 for (sock = 0; readfds_local != 0; sock++, readfds_local >>= 1) { 423 if ((readfds_local & 1) != 0) { 424 /* sock has input waiting */ 425 xprt = xports[sock]; 426 #endif /* def FD_SETSIZE */ 427 /* now receive msgs from xprtprt (support batch calls) */ 428 do { 429 if (SVC_RECV(xprt, &msg)) { 430 431 /* now find the exported program and call it */ 432 register struct svc_callout *s; 433 enum auth_stat why; 434 435 r.rq_xprt = xprt; 436 r.rq_prog = msg.rm_call.cb_prog; 437 r.rq_vers = msg.rm_call.cb_vers; 438 r.rq_proc = msg.rm_call.cb_proc; 439 r.rq_cred = msg.rm_call.cb_cred; 440 /* first authenticate the message */ 441 if ((why= _authenticate(&r, &msg)) != AUTH_OK) { 442 svcerr_auth(xprt, why); 443 goto call_done; 444 } 445 /* now match message with a registered service*/ 446 prog_found = FALSE; 447 low_vers = 0 - 1; 448 high_vers = 0; 449 for (s = svc_head; s != NULL_SVC; s = s->sc_next) { 450 if (s->sc_prog == r.rq_prog) { 451 if (s->sc_vers == r.rq_vers) { 452 (*s->sc_dispatch)(&r, xprt); 453 goto call_done; 454 } /* found correct version */ 455 prog_found = TRUE; 456 if (s->sc_vers < low_vers) 457 low_vers = s->sc_vers; 458 if (s->sc_vers > high_vers) 459 high_vers = s->sc_vers; 460 } /* found correct program */ 461 } 462 /* 463 * if we got here, the program or version 464 * is not served ... 465 */ 466 if (prog_found) 467 svcerr_progvers(xprt, 468 low_vers, high_vers); 469 else 470 svcerr_noprog(xprt); 471 /* Fall through to ... */ 472 } 473 call_done: 474 if ((stat = SVC_STAT(xprt)) == XPRT_DIED){ 475 SVC_DESTROY(xprt); 476 break; 477 } 478 } while (stat == XPRT_MOREREQS); 479 } 480 } 481 } 482