535 lines
11 KiB
C
535 lines
11 KiB
C
#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)svc.c 1.1 92/07/30 Copyr 1988 Sun Micro";
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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) 1988, Sun Microsystems, Inc.
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*/
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#ifdef KERNEL
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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#include <rpc/auth.h>
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#include <rpc/clnt.h>
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#include <rpc/rpc_msg.h>
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#include <rpc/svc.h>
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#include <rpc/svc_auth.h>
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char *kmem_alloc();
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caddr_t rqcred_head; /* head of cashed, free authentication parameters */
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#else
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#include <sys/errno.h>
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#include <sys/time.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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#endif
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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 SVC_VERSQUIET 0x0001 /* keept quiet about vers mismatch */
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#define version_keepquiet(xp) ((u_long)(xp)->xp_p3 & SVC_VERSQUIET)
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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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/*
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* Activate a transport handle.
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*/
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#ifdef KERNEL
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/*ARGSUSED*/
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#endif
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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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#ifndef KERNEL
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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 < _rpc_dtablesize()) {
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xports[sock] = xprt;
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FD_SET(sock, &svc_fdset);
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}
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#endif
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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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#ifndef KERNEL
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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 < _rpc_dtablesize()) && (xports[sock] == xprt)) {
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xports[sock] = (SVCXPRT *)0;
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FD_CLR(sock, &svc_fdset);
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}
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}
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#endif
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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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#ifdef KERNEL
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/*ARGSUSED*/
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#endif
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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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#ifndef KERNEL
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if (s == (struct svc_callout *)0) {
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return (FALSE);
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}
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#endif
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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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#ifndef KERNEL
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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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#endif
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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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#ifndef KERNEL
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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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#endif
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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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#ifndef KERNEL
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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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* Tell RPC package to not complain about version errors to the client. This
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* is useful when revving broadcast protocols that sit on a fixed address.
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* There is really one (or should be only one) example of this kind of
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* protocol: the portmapper (or rpc binder).
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*/
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void
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svc_versquiet(xprt)
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register SVCXPRT *xprt;
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{
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(u_long)xprt->xp_p3 |= SVC_VERSQUIET;
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}
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#endif !KERNEL
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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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#ifndef KERNEL
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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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#endif
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void
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#ifdef KERNEL
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svc_getreq(xprt)
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register SVCXPRT *xprt;
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#else
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svc_getreqset(readfds)
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fd_set *readfds;
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#endif
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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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#ifndef KERNEL
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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 setsize;
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register int sock;
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char cred_area[2*MAX_AUTH_BYTES + RQCRED_SIZE];
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#else
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char *cred_area; /* too big to allocate on call stack */
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/*
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* Firstly, allocate the authentication parameters' storage
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*/
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if (rqcred_head) {
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cred_area = rqcred_head;
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rqcred_head = *(caddr_t *)rqcred_head;
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} else {
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cred_area = mem_alloc(2*MAX_AUTH_BYTES + RQCRED_SIZE);
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}
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#endif
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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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#ifndef KERNEL
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setsize = _rpc_dtablesize();
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maskp = (u_long *)readfds->fds_bits;
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for (sock = 0; sock < 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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#endif
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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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#ifdef KERNEL
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/*
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* Free the arguments.
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*/
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(void) SVC_FREEARGS(xprt, (xdrproc_t)0,
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(caddr_t)0);
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#endif
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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;
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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)
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(&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 && !version_keepquiet(xprt))
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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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#ifdef KERNEL
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/*
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* Free the arguments. This is done
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* by the dispatch routine for successful
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* calls.
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*/
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(void) SVC_FREEARGS(xprt, (xdrproc_t)0,
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(caddr_t)0);
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#endif
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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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#ifndef KERNEL
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}
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}
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#else
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/*
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* free authentication parameters' storage
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*/
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*(caddr_t *)cred_area = rqcred_head;
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rqcred_head = cred_area;
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#endif
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}
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/*
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* This is the rpc server side idle loop
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* Wait for input, call server program.
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*/
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#ifdef KERNEL
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int Rpccnt;
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void
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svc_run(xprt)
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SVCXPRT *xprt;
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{
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int s;
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while (TRUE) {
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s = splnet();
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while (xprt->xp_sock->so_rcv.sb_cc == 0)
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sbwait(&xprt->xp_sock->so_rcv);
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(void) splx(s);
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svc_getreq(xprt);
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Rpccnt++;
|
|
}
|
|
}
|
|
#endif
|