450 lines
11 KiB
C
450 lines
11 KiB
C
/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char *sccsid = "from: @(#)svc.c 1.44 88/02/08 Copyr 1984 Sun Micro";*/
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/*static char *sccsid = "from: @(#)svc.c 2.4 88/08/11 4.0 RPCSRC";*/
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static char *rcsid = "$Id: svc.c,v 1.3 1994/08/23 18:42:11 deraadt Exp $";
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#endif
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/*
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* svc.c, Server-side remote procedure call interface.
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*
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* There are two sets of procedures here. The xprt routines are
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* for handling transport handles. The svc routines handle the
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* list of service routines.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*/
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#include <sys/errno.h>
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#include <rpc/rpc.h>
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#include <rpc/pmap_clnt.h>
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extern int errno;
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static SVCXPRT **xports;
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#define NULL_SVC ((struct svc_callout *)0)
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#define RQCRED_SIZE 400 /* this size is excessive */
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#define max(a, b) (a > b ? a : b)
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/*
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* The services list
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* Each entry represents a set of procedures (an rpc program).
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* The dispatch routine takes request structs and runs the
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* apropriate procedure.
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*/
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static struct svc_callout {
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struct svc_callout *sc_next;
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u_long sc_prog;
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u_long sc_vers;
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void (*sc_dispatch)();
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} *svc_head;
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static struct svc_callout *svc_find();
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/* *************** SVCXPRT related stuff **************** */
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extern int svc_maxfd;
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/*
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* Activate a transport handle.
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*/
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void
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xprt_register(xprt)
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SVCXPRT *xprt;
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{
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register int sock = xprt->xp_sock;
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if (xports == NULL) {
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xports = (SVCXPRT **)
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mem_alloc(FD_SETSIZE * sizeof(SVCXPRT *));
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}
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if (sock < FD_SETSIZE) {
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xports[sock] = xprt;
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FD_SET(sock, &svc_fdset);
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svc_maxfd = max(svc_maxfd, sock);
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}
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}
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/*
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* De-activate a transport handle.
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*/
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void
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xprt_unregister(xprt)
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SVCXPRT *xprt;
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{
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register int sock = xprt->xp_sock;
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if ((sock < FD_SETSIZE) && (xports[sock] == xprt)) {
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xports[sock] = (SVCXPRT *)0;
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FD_CLR(sock, &svc_fdset);
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if (sock == svc_maxfd) {
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for (svc_maxfd--; svc_maxfd>=0; svc_maxfd--)
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if (xports[svc_maxfd])
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break;
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}
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}
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}
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/* ********************** CALLOUT list related stuff ************* */
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/*
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* Add a service program to the callout list.
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* The dispatch routine will be called when a rpc request for this
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* program number comes in.
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*/
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bool_t
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svc_register(xprt, prog, vers, dispatch, protocol)
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SVCXPRT *xprt;
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u_long prog;
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u_long vers;
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void (*dispatch)();
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int protocol;
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{
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struct svc_callout *prev;
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register struct svc_callout *s;
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if ((s = svc_find(prog, vers, &prev)) != NULL_SVC) {
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if (s->sc_dispatch == dispatch)
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goto pmap_it; /* he is registering another xptr */
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return (FALSE);
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}
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s = (struct svc_callout *)mem_alloc(sizeof(struct svc_callout));
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if (s == (struct svc_callout *)0) {
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return (FALSE);
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}
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s->sc_prog = prog;
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s->sc_vers = vers;
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s->sc_dispatch = dispatch;
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s->sc_next = svc_head;
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svc_head = s;
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pmap_it:
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/* now register the information with the local binder service */
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if (protocol) {
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return (pmap_set(prog, vers, protocol, xprt->xp_port));
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}
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return (TRUE);
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}
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/*
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* Remove a service program from the callout list.
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*/
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void
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svc_unregister(prog, vers)
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u_long prog;
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u_long vers;
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{
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struct svc_callout *prev;
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register struct svc_callout *s;
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if ((s = svc_find(prog, vers, &prev)) == NULL_SVC)
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return;
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if (prev == NULL_SVC) {
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svc_head = s->sc_next;
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} else {
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prev->sc_next = s->sc_next;
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}
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s->sc_next = NULL_SVC;
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mem_free((char *) s, (u_int) sizeof(struct svc_callout));
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/* now unregister the information with the local binder service */
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(void)pmap_unset(prog, vers);
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}
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/*
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* Search the callout list for a program number, return the callout
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* struct.
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*/
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static struct svc_callout *
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svc_find(prog, vers, prev)
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u_long prog;
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u_long vers;
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struct svc_callout **prev;
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{
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register struct svc_callout *s, *p;
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p = NULL_SVC;
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for (s = svc_head; s != NULL_SVC; s = s->sc_next) {
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if ((s->sc_prog == prog) && (s->sc_vers == vers))
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goto done;
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p = s;
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}
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done:
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*prev = p;
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return (s);
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}
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/* ******************* REPLY GENERATION ROUTINES ************ */
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/*
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* Send a reply to an rpc request
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*/
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bool_t
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svc_sendreply(xprt, xdr_results, xdr_location)
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register SVCXPRT *xprt;
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xdrproc_t xdr_results;
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caddr_t xdr_location;
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{
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struct rpc_msg rply;
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rply.rm_direction = REPLY;
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rply.rm_reply.rp_stat = MSG_ACCEPTED;
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rply.acpted_rply.ar_verf = xprt->xp_verf;
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rply.acpted_rply.ar_stat = SUCCESS;
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rply.acpted_rply.ar_results.where = xdr_location;
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rply.acpted_rply.ar_results.proc = xdr_results;
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return (SVC_REPLY(xprt, &rply));
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}
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/*
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* No procedure error reply
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*/
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void
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svcerr_noproc(xprt)
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register SVCXPRT *xprt;
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{
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struct rpc_msg rply;
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rply.rm_direction = REPLY;
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rply.rm_reply.rp_stat = MSG_ACCEPTED;
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rply.acpted_rply.ar_verf = xprt->xp_verf;
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rply.acpted_rply.ar_stat = PROC_UNAVAIL;
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SVC_REPLY(xprt, &rply);
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}
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/*
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* Can't decode args error reply
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*/
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void
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svcerr_decode(xprt)
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register SVCXPRT *xprt;
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{
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struct rpc_msg rply;
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rply.rm_direction = REPLY;
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rply.rm_reply.rp_stat = MSG_ACCEPTED;
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rply.acpted_rply.ar_verf = xprt->xp_verf;
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rply.acpted_rply.ar_stat = GARBAGE_ARGS;
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SVC_REPLY(xprt, &rply);
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}
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/*
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* Some system error
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*/
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void
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svcerr_systemerr(xprt)
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register SVCXPRT *xprt;
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{
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struct rpc_msg rply;
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rply.rm_direction = REPLY;
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rply.rm_reply.rp_stat = MSG_ACCEPTED;
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rply.acpted_rply.ar_verf = xprt->xp_verf;
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rply.acpted_rply.ar_stat = SYSTEM_ERR;
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SVC_REPLY(xprt, &rply);
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}
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/*
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* Authentication error reply
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*/
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void
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svcerr_auth(xprt, why)
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SVCXPRT *xprt;
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enum auth_stat why;
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{
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struct rpc_msg rply;
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rply.rm_direction = REPLY;
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rply.rm_reply.rp_stat = MSG_DENIED;
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rply.rjcted_rply.rj_stat = AUTH_ERROR;
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rply.rjcted_rply.rj_why = why;
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SVC_REPLY(xprt, &rply);
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}
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/*
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* Auth too weak error reply
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*/
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void
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svcerr_weakauth(xprt)
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SVCXPRT *xprt;
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{
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svcerr_auth(xprt, AUTH_TOOWEAK);
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}
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/*
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* Program unavailable error reply
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*/
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void
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svcerr_noprog(xprt)
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register SVCXPRT *xprt;
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{
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struct rpc_msg rply;
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rply.rm_direction = REPLY;
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rply.rm_reply.rp_stat = MSG_ACCEPTED;
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rply.acpted_rply.ar_verf = xprt->xp_verf;
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rply.acpted_rply.ar_stat = PROG_UNAVAIL;
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SVC_REPLY(xprt, &rply);
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}
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/*
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* Program version mismatch error reply
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*/
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void
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svcerr_progvers(xprt, low_vers, high_vers)
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register SVCXPRT *xprt;
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u_long low_vers;
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u_long high_vers;
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{
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struct rpc_msg rply;
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rply.rm_direction = REPLY;
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rply.rm_reply.rp_stat = MSG_ACCEPTED;
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rply.acpted_rply.ar_verf = xprt->xp_verf;
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rply.acpted_rply.ar_stat = PROG_MISMATCH;
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rply.acpted_rply.ar_vers.low = low_vers;
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rply.acpted_rply.ar_vers.high = high_vers;
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SVC_REPLY(xprt, &rply);
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}
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/* ******************* SERVER INPUT STUFF ******************* */
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/*
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* Get server side input from some transport.
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*
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* Statement of authentication parameters management:
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* This function owns and manages all authentication parameters, specifically
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* the "raw" parameters (msg.rm_call.cb_cred and msg.rm_call.cb_verf) and
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* the "cooked" credentials (rqst->rq_clntcred).
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* However, this function does not know the structure of the cooked
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* credentials, so it make the following assumptions:
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* a) the structure is contiguous (no pointers), and
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* b) the cred structure size does not exceed RQCRED_SIZE bytes.
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* In all events, all three parameters are freed upon exit from this routine.
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* The storage is trivially management on the call stack in user land, but
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* is mallocated in kernel land.
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*/
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void
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svc_getreq(rdfds)
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int rdfds;
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{
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fd_set readfds;
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FD_ZERO(&readfds);
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readfds.fds_bits[0] = rdfds;
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svc_getreqset(&readfds);
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}
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void
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svc_getreqset(readfds)
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fd_set *readfds;
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{
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enum xprt_stat stat;
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struct rpc_msg msg;
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int prog_found;
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u_long low_vers;
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u_long high_vers;
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struct svc_req r;
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register SVCXPRT *xprt;
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register u_long mask;
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register int bit;
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register u_long *maskp;
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register int sock;
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char cred_area[2*MAX_AUTH_BYTES + RQCRED_SIZE];
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msg.rm_call.cb_cred.oa_base = cred_area;
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msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]);
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r.rq_clntcred = &(cred_area[2*MAX_AUTH_BYTES]);
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maskp = (u_long *)readfds->fds_bits;
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for (sock = 0; sock < FD_SETSIZE; sock += NFDBITS) {
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for (mask = *maskp++; bit = ffs(mask); mask ^= (1 << (bit - 1))) {
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/* sock has input waiting */
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xprt = xports[sock + bit - 1];
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/* now receive msgs from xprtprt (support batch calls) */
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do {
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if (SVC_RECV(xprt, &msg)) {
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/* now find the exported program and call it */
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register struct svc_callout *s;
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enum auth_stat why;
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r.rq_xprt = xprt;
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r.rq_prog = msg.rm_call.cb_prog;
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r.rq_vers = msg.rm_call.cb_vers;
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r.rq_proc = msg.rm_call.cb_proc;
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r.rq_cred = msg.rm_call.cb_cred;
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/* first authenticate the message */
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if ((why= _authenticate(&r, &msg)) != AUTH_OK) {
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svcerr_auth(xprt, why);
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goto call_done;
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}
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/* now match message with a registered service*/
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prog_found = FALSE;
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low_vers = 0 - 1;
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high_vers = 0;
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for (s = svc_head; s != NULL_SVC; s = s->sc_next) {
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if (s->sc_prog == r.rq_prog) {
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if (s->sc_vers == r.rq_vers) {
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(*s->sc_dispatch)(&r, xprt);
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goto call_done;
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} /* found correct version */
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prog_found = TRUE;
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if (s->sc_vers < low_vers)
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low_vers = s->sc_vers;
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if (s->sc_vers > high_vers)
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high_vers = s->sc_vers;
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} /* found correct program */
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}
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/*
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* if we got here, the program or version
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* is not served ...
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*/
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if (prog_found)
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svcerr_progvers(xprt,
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low_vers, high_vers);
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else
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svcerr_noprog(xprt);
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/* Fall through to ... */
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}
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call_done:
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if ((stat = SVC_STAT(xprt)) == XPRT_DIED){
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SVC_DESTROY(xprt);
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break;
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}
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} while (stat == XPRT_MOREREQS);
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}
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}
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}
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