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svc.c revision 1.4 
      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 1.4 1994/12/04 01:13:23 cgd 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 <stdlib.h>
     47 
     48 #include <sys/errno.h>
     49 #include <rpc/rpc.h>
     50 #include <rpc/pmap_clnt.h>
     51 
     52 static SVCXPRT **xports;
     53 
     54 #define NULL_SVC ((struct svc_callout *)0)
     55 #define	RQCRED_SIZE	400		/* this size is excessive */
     56 
     57 #define max(a, b) (a > b ? a : b)
     58 
     59 /*
     60  * The services list
     61  * Each entry represents a set of procedures (an rpc program).
     62  * The dispatch routine takes request structs and runs the
     63  * apropriate procedure.
     64  */
     65 static struct svc_callout {
     66 	struct svc_callout *sc_next;
     67 	u_long		    sc_prog;
     68 	u_long		    sc_vers;
     69 	void		    (*sc_dispatch)();
     70 } *svc_head;
     71 
     72 static struct svc_callout *svc_find();
     73 
     74 /* ***************  SVCXPRT related stuff **************** */
     75 
     76 extern int svc_maxfd;
     77 
     78 /*
     79  * Activate a transport handle.
     80  */
     81 void
     82 xprt_register(xprt)
     83 	SVCXPRT *xprt;
     84 {
     85 	register int sock = xprt->xp_sock;
     86 
     87 	if (xports == NULL) {
     88 		xports = (SVCXPRT **)
     89 			mem_alloc(FD_SETSIZE * sizeof(SVCXPRT *));
     90 	}
     91 	if (sock < FD_SETSIZE) {
     92 		xports[sock] = xprt;
     93 		FD_SET(sock, &svc_fdset);
     94 		svc_maxfd = max(svc_maxfd, sock);
     95 	}
     96 }
     97 
     98 /*
     99  * De-activate a transport handle.
    100  */
    101 void
    102 xprt_unregister(xprt)
    103 	SVCXPRT *xprt;
    104 {
    105 	register int sock = xprt->xp_sock;
    106 
    107 	if ((sock < FD_SETSIZE) && (xports[sock] == xprt)) {
    108 		xports[sock] = (SVCXPRT *)0;
    109 		FD_CLR(sock, &svc_fdset);
    110 		if (sock == svc_maxfd) {
    111 			for (svc_maxfd--; svc_maxfd>=0; svc_maxfd--)
    112 				if (xports[svc_maxfd])
    113 					break;
    114 		}
    115 	}
    116 }
    117 
    118 
    119 /* ********************** CALLOUT list related stuff ************* */
    120 
    121 /*
    122  * Add a service program to the callout list.
    123  * The dispatch routine will be called when a rpc request for this
    124  * program number comes in.
    125  */
    126 bool_t
    127 svc_register(xprt, prog, vers, dispatch, protocol)
    128 	SVCXPRT *xprt;
    129 	u_long prog;
    130 	u_long vers;
    131 	void (*dispatch)();
    132 	int protocol;
    133 {
    134 	struct svc_callout *prev;
    135 	register struct svc_callout *s;
    136 
    137 	if ((s = svc_find(prog, vers, &prev)) != NULL_SVC) {
    138 		if (s->sc_dispatch == dispatch)
    139 			goto pmap_it;  /* he is registering another xptr */
    140 		return (FALSE);
    141 	}
    142 	s = (struct svc_callout *)mem_alloc(sizeof(struct svc_callout));
    143 	if (s == (struct svc_callout *)0) {
    144 		return (FALSE);
    145 	}
    146 	s->sc_prog = prog;
    147 	s->sc_vers = vers;
    148 	s->sc_dispatch = dispatch;
    149 	s->sc_next = svc_head;
    150 	svc_head = s;
    151 pmap_it:
    152 	/* now register the information with the local binder service */
    153 	if (protocol) {
    154 		return (pmap_set(prog, vers, protocol, xprt->xp_port));
    155 	}
    156 	return (TRUE);
    157 }
    158 
    159 /*
    160  * Remove a service program from the callout list.
    161  */
    162 void
    163 svc_unregister(prog, vers)
    164 	u_long prog;
    165 	u_long vers;
    166 {
    167 	struct svc_callout *prev;
    168 	register struct svc_callout *s;
    169 
    170 	if ((s = svc_find(prog, vers, &prev)) == NULL_SVC)
    171 		return;
    172 	if (prev == NULL_SVC) {
    173 		svc_head = s->sc_next;
    174 	} else {
    175 		prev->sc_next = s->sc_next;
    176 	}
    177 	s->sc_next = NULL_SVC;
    178 	mem_free((char *) s, (u_int) sizeof(struct svc_callout));
    179 	/* now unregister the information with the local binder service */
    180 	(void)pmap_unset(prog, vers);
    181 }
    182 
    183 /*
    184  * Search the callout list for a program number, return the callout
    185  * struct.
    186  */
    187 static struct svc_callout *
    188 svc_find(prog, vers, prev)
    189 	u_long prog;
    190 	u_long vers;
    191 	struct svc_callout **prev;
    192 {
    193 	register struct svc_callout *s, *p;
    194 
    195 	p = NULL_SVC;
    196 	for (s = svc_head; s != NULL_SVC; s = s->sc_next) {
    197 		if ((s->sc_prog == prog) && (s->sc_vers == vers))
    198 			goto done;
    199 		p = s;
    200 	}
    201 done:
    202 	*prev = p;
    203 	return (s);
    204 }
    205 
    206 /* ******************* REPLY GENERATION ROUTINES  ************ */
    207 
    208 /*
    209  * Send a reply to an rpc request
    210  */
    211 bool_t
    212 svc_sendreply(xprt, xdr_results, xdr_location)
    213 	register SVCXPRT *xprt;
    214 	xdrproc_t xdr_results;
    215 	caddr_t xdr_location;
    216 {
    217 	struct rpc_msg rply;
    218 
    219 	rply.rm_direction = REPLY;
    220 	rply.rm_reply.rp_stat = MSG_ACCEPTED;
    221 	rply.acpted_rply.ar_verf = xprt->xp_verf;
    222 	rply.acpted_rply.ar_stat = SUCCESS;
    223 	rply.acpted_rply.ar_results.where = xdr_location;
    224 	rply.acpted_rply.ar_results.proc = xdr_results;
    225 	return (SVC_REPLY(xprt, &rply));
    226 }
    227 
    228 /*
    229  * No procedure error reply
    230  */
    231 void
    232 svcerr_noproc(xprt)
    233 	register SVCXPRT *xprt;
    234 {
    235 	struct rpc_msg rply;
    236 
    237 	rply.rm_direction = REPLY;
    238 	rply.rm_reply.rp_stat = MSG_ACCEPTED;
    239 	rply.acpted_rply.ar_verf = xprt->xp_verf;
    240 	rply.acpted_rply.ar_stat = PROC_UNAVAIL;
    241 	SVC_REPLY(xprt, &rply);
    242 }
    243 
    244 /*
    245  * Can't decode args error reply
    246  */
    247 void
    248 svcerr_decode(xprt)
    249 	register SVCXPRT *xprt;
    250 {
    251 	struct rpc_msg rply;
    252 
    253 	rply.rm_direction = REPLY;
    254 	rply.rm_reply.rp_stat = MSG_ACCEPTED;
    255 	rply.acpted_rply.ar_verf = xprt->xp_verf;
    256 	rply.acpted_rply.ar_stat = GARBAGE_ARGS;
    257 	SVC_REPLY(xprt, &rply);
    258 }
    259 
    260 /*
    261  * Some system error
    262  */
    263 void
    264 svcerr_systemerr(xprt)
    265 	register SVCXPRT *xprt;
    266 {
    267 	struct rpc_msg rply;
    268 
    269 	rply.rm_direction = REPLY;
    270 	rply.rm_reply.rp_stat = MSG_ACCEPTED;
    271 	rply.acpted_rply.ar_verf = xprt->xp_verf;
    272 	rply.acpted_rply.ar_stat = SYSTEM_ERR;
    273 	SVC_REPLY(xprt, &rply);
    274 }
    275 
    276 /*
    277  * Authentication error reply
    278  */
    279 void
    280 svcerr_auth(xprt, why)
    281 	SVCXPRT *xprt;
    282 	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 }
    292 
    293 /*
    294  * Auth too weak error reply
    295  */
    296 void
    297 svcerr_weakauth(xprt)
    298 	SVCXPRT *xprt;
    299 {
    300 
    301 	svcerr_auth(xprt, AUTH_TOOWEAK);
    302 }
    303 
    304 /*
    305  * Program unavailable error reply
    306  */
    307 void
    308 svcerr_noprog(xprt)
    309 	register SVCXPRT *xprt;
    310 {
    311 	struct rpc_msg rply;
    312 
    313 	rply.rm_direction = REPLY;
    314 	rply.rm_reply.rp_stat = MSG_ACCEPTED;
    315 	rply.acpted_rply.ar_verf = xprt->xp_verf;
    316 	rply.acpted_rply.ar_stat = PROG_UNAVAIL;
    317 	SVC_REPLY(xprt, &rply);
    318 }
    319 
    320 /*
    321  * Program version mismatch error reply
    322  */
    323 void
    324 svcerr_progvers(xprt, low_vers, high_vers)
    325 	register SVCXPRT *xprt;
    326 	u_long low_vers;
    327 	u_long high_vers;
    328 {
    329 	struct rpc_msg rply;
    330 
    331 	rply.rm_direction = REPLY;
    332 	rply.rm_reply.rp_stat = MSG_ACCEPTED;
    333 	rply.acpted_rply.ar_verf = xprt->xp_verf;
    334 	rply.acpted_rply.ar_stat = PROG_MISMATCH;
    335 	rply.acpted_rply.ar_vers.low = low_vers;
    336 	rply.acpted_rply.ar_vers.high = high_vers;
    337 	SVC_REPLY(xprt, &rply);
    338 }
    339 
    340 /* ******************* SERVER INPUT STUFF ******************* */
    341 
    342 /*
    343  * Get server side input from some transport.
    344  *
    345  * Statement of authentication parameters management:
    346  * This function owns and manages all authentication parameters, specifically
    347  * the "raw" parameters (msg.rm_call.cb_cred and msg.rm_call.cb_verf) and
    348  * the "cooked" credentials (rqst->rq_clntcred).
    349  * However, this function does not know the structure of the cooked
    350  * credentials, so it make the following assumptions:
    351  *   a) the structure is contiguous (no pointers), and
    352  *   b) the cred structure size does not exceed RQCRED_SIZE bytes.
    353  * In all events, all three parameters are freed upon exit from this routine.
    354  * The storage is trivially management on the call stack in user land, but
    355  * is mallocated in kernel land.
    356  */
    357 
    358 void
    359 svc_getreq(rdfds)
    360 	int rdfds;
    361 {
    362 	fd_set readfds;
    363 
    364 	FD_ZERO(&readfds);
    365 	readfds.fds_bits[0] = rdfds;
    366 	svc_getreqset(&readfds);
    367 }
    368 
    369 void
    370 svc_getreqset(readfds)
    371 	fd_set *readfds;
    372 {
    373 	enum xprt_stat stat;
    374 	struct rpc_msg msg;
    375 	int prog_found;
    376 	u_long low_vers;
    377 	u_long high_vers;
    378 	struct svc_req r;
    379 	register SVCXPRT *xprt;
    380 	register int bit;
    381 	register u_int32_t mask, *maskp;
    382 	register int sock;
    383 	char cred_area[2*MAX_AUTH_BYTES + RQCRED_SIZE];
    384 	msg.rm_call.cb_cred.oa_base = cred_area;
    385 	msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]);
    386 	r.rq_clntcred = &(cred_area[2*MAX_AUTH_BYTES]);
    387 
    388 
    389 	maskp = readfds->fds_bits;
    390 	for (sock = 0; sock < FD_SETSIZE; sock += NFDBITS) {
    391 	    for (mask = *maskp++; bit = ffs(mask); mask ^= (1 << (bit - 1))) {
    392 		/* sock has input waiting */
    393 		xprt = xports[sock + bit - 1];
    394 		/* now receive msgs from xprtprt (support batch calls) */
    395 		do {
    396 			if (SVC_RECV(xprt, &msg)) {
    397 
    398 				/* now find the exported program and call it */
    399 				register struct svc_callout *s;
    400 				enum auth_stat why;
    401 
    402 				r.rq_xprt = xprt;
    403 				r.rq_prog = msg.rm_call.cb_prog;
    404 				r.rq_vers = msg.rm_call.cb_vers;
    405 				r.rq_proc = msg.rm_call.cb_proc;
    406 				r.rq_cred = msg.rm_call.cb_cred;
    407 				/* first authenticate the message */
    408 				if ((why= _authenticate(&r, &msg)) != AUTH_OK) {
    409 					svcerr_auth(xprt, why);
    410 					goto call_done;
    411 				}
    412 				/* now match message with a registered service*/
    413 				prog_found = FALSE;
    414 				low_vers = 0 - 1;
    415 				high_vers = 0;
    416 				for (s = svc_head; s != NULL_SVC; s = s->sc_next) {
    417 					if (s->sc_prog == r.rq_prog) {
    418 						if (s->sc_vers == r.rq_vers) {
    419 							(*s->sc_dispatch)(&r, xprt);
    420 							goto call_done;
    421 						}  /* found correct version */
    422 						prog_found = TRUE;
    423 						if (s->sc_vers < low_vers)
    424 							low_vers = s->sc_vers;
    425 						if (s->sc_vers > high_vers)
    426 							high_vers = s->sc_vers;
    427 					}   /* found correct program */
    428 				}
    429 				/*
    430 				 * if we got here, the program or version
    431 				 * is not served ...
    432 				 */
    433 				if (prog_found)
    434 					svcerr_progvers(xprt,
    435 					low_vers, high_vers);
    436 				else
    437 					 svcerr_noprog(xprt);
    438 				/* Fall through to ... */
    439 			}
    440 		call_done:
    441 			if ((stat = SVC_STAT(xprt)) == XPRT_DIED){
    442 				SVC_DESTROY(xprt);
    443 				break;
    444 			}
    445 		} while (stat == XPRT_MOREREQS);
    446 	    }
    447 	}
    448 }
    449