718 lines
16 KiB
C
718 lines
16 KiB
C
/* $NetBSD: svc.c,v 1.21 2000/07/06 03:10:35 christos Exp $ */
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/*
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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 = "@(#)svc.c 1.44 88/02/08 Copyr 1984 Sun Micro";
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static char *sccsid = "@(#)svc.c 2.4 88/08/11 4.0 RPCSRC";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 "namespace.h"
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#include "reentrant.h"
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#include <sys/types.h>
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#include <sys/poll.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <rpc/rpc.h>
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#ifdef PORTMAP
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#include <rpc/pmap_clnt.h>
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#endif /* PORTMAP */
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#include "un-namespace.h"
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#include "rpc_com.h"
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static SVCXPRT **xports;
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#define RQCRED_SIZE 400 /* this size is excessive */
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#define SVC_VERSQUIET 0x0001 /* keep quiet about vers mismatch */
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#define version_keepquiet(xp) ((u_long)(xp)->xp_p3 & SVC_VERSQUIET)
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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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rpcprog_t sc_prog;
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rpcvers_t sc_vers;
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char *sc_netid;
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void (*sc_dispatch)(struct svc_req *, SVCXPRT *);
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} *svc_head;
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extern rwlock_t svc_lock;
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extern rwlock_t svc_fd_lock;
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static struct svc_callout *svc_find(rpcprog_t, rpcvers_t,
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struct svc_callout **, char *);
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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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void
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xprt_register(xprt)
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SVCXPRT *xprt;
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{
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int sock;
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assert(xprt != NULL);
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sock = xprt->xp_fd;
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rwlock_wrlock(&svc_fd_lock);
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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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if (xports == NULL)
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return;
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memset(xports, '\0', 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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rwlock_unlock(&svc_fd_lock);
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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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int sock;
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assert(xprt != NULL);
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sock = xprt->xp_fd;
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rwlock_wrlock(&svc_fd_lock);
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if ((sock < FD_SETSIZE) && (xports[sock] == xprt)) {
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xports[sock] = NULL;
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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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rwlock_unlock(&svc_fd_lock);
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}
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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_reg(xprt, prog, vers, dispatch, nconf)
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SVCXPRT *xprt;
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const rpcprog_t prog;
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const rpcvers_t vers;
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void (*dispatch)(struct svc_req *, SVCXPRT *);
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const struct netconfig *nconf;
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{
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bool_t dummy;
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struct svc_callout *prev;
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struct svc_callout *s;
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struct netconfig *tnconf;
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char *netid = NULL;
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int flag = 0;
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/* VARIABLES PROTECTED BY svc_lock: s, prev, svc_head */
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if (xprt->xp_netid) {
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netid = strdup(xprt->xp_netid);
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flag = 1;
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} else if (nconf && nconf->nc_netid) {
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netid = strdup(nconf->nc_netid);
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flag = 1;
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} else if ((tnconf = __rpcgettp(xprt->xp_fd)) != NULL) {
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netid = strdup(tnconf->nc_netid);
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flag = 1;
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freenetconfigent(tnconf);
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} /* must have been created with svc_raw_create */
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if ((netid == NULL) && (flag == 1)) {
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return (FALSE);
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}
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rwlock_wrlock(&svc_lock);
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if ((s = svc_find(prog, vers, &prev, netid)) != NULL) {
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if (netid)
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free(netid);
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if (s->sc_dispatch == dispatch)
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goto rpcb_it; /* he is registering another xptr */
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rwlock_unlock(&svc_lock);
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return (FALSE);
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}
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s = mem_alloc(sizeof (struct svc_callout));
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if (s == NULL) {
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if (netid)
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free(netid);
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rwlock_unlock(&svc_lock);
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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_netid = netid;
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s->sc_next = svc_head;
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svc_head = s;
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if ((xprt->xp_netid == NULL) && (flag == 1) && netid)
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((SVCXPRT *) xprt)->xp_netid = strdup(netid);
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rpcb_it:
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rwlock_unlock(&svc_lock);
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/* now register the information with the local binder service */
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if (nconf) {
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/*LINTED const castaway*/
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dummy = rpcb_set(prog, vers, (struct netconfig *) nconf,
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&((SVCXPRT *) xprt)->xp_ltaddr);
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return (dummy);
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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_unreg(prog, vers)
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const rpcprog_t prog;
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const rpcvers_t vers;
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{
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struct svc_callout *prev;
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struct svc_callout *s;
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/* unregister the information anyway */
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(void) rpcb_unset(prog, vers, NULL);
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rwlock_wrlock(&svc_lock);
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while ((s = svc_find(prog, vers, &prev, NULL)) != NULL) {
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if (prev == NULL) {
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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;
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if (s->sc_netid)
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mem_free(s->sc_netid, sizeof (s->sc_netid) + 1);
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mem_free(s, sizeof (struct svc_callout));
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}
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rwlock_unlock(&svc_lock);
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}
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/* ********************** CALLOUT list related stuff ************* */
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#ifdef PORTMAP
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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)(struct svc_req *, SVCXPRT *);
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int protocol;
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{
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struct svc_callout *prev;
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struct svc_callout *s;
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assert(xprt != NULL);
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assert(dispatch != NULL);
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if ((s = svc_find((rpcprog_t)prog, (rpcvers_t)vers, &prev, NULL)) !=
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NULL) {
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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 = mem_alloc(sizeof(struct svc_callout));
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if (s == NULL) {
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return (FALSE);
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}
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s->sc_prog = (rpcprog_t)prog;
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s->sc_vers = (rpcvers_t)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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struct svc_callout *s;
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if ((s = svc_find((rpcprog_t)prog, (rpcvers_t)vers, &prev, NULL)) ==
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NULL)
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return;
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if (prev == NULL) {
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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;
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mem_free(s, 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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#endif /* PORTMAP */
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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, netid)
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rpcprog_t prog;
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rpcvers_t vers;
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struct svc_callout **prev;
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char *netid;
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{
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struct svc_callout *s, *p;
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assert(prev != NULL);
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p = NULL;
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for (s = svc_head; s != NULL; s = s->sc_next) {
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if (((s->sc_prog == prog) && (s->sc_vers == vers)) &&
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((netid == NULL) || (s->sc_netid == NULL) ||
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(strcmp(netid, s->sc_netid) == 0)))
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break;
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p = s;
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}
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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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SVCXPRT *xprt;
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xdrproc_t xdr_results;
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void * xdr_location;
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{
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struct rpc_msg rply;
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assert(xprt != NULL);
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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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SVCXPRT *xprt;
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{
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struct rpc_msg rply;
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assert(xprt != NULL);
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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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SVCXPRT *xprt;
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{
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struct rpc_msg rply;
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assert(xprt != NULL);
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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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SVCXPRT *xprt;
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{
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struct rpc_msg rply;
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assert(xprt != NULL);
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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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#if 0
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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_on(xprt)
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SVCXPRT *xprt;
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{
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u_long tmp;
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tmp = ((u_long) xprt->xp_p3) | SVC_VERSQUIET;
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xprt->xp_p3 = tmp;
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}
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void
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__svc_versquiet_off(xprt)
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SVCXPRT *xprt;
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{
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u_long tmp;
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tmp = ((u_long) xprt->xp_p3) & ~SVC_VERSQUIET;
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xprt->xp_p3 = tmp;
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}
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void
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svc_versquiet(xprt)
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SVCXPRT *xprt;
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{
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__svc_versquiet_on(xprt);
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}
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int
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__svc_versquiet_get(xprt)
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SVCXPRT *xprt;
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{
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return ((int) xprt->xp_p3) & SVC_VERSQUIET;
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}
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#endif
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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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assert(xprt != NULL);
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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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assert(xprt != NULL);
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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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SVCXPRT *xprt;
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{
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struct rpc_msg rply;
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assert(xprt != NULL);
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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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SVCXPRT *xprt;
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rpcvers_t low_vers;
|
|
rpcvers_t high_vers;
|
|
{
|
|
struct rpc_msg rply;
|
|
|
|
assert(xprt != NULL);
|
|
|
|
rply.rm_direction = REPLY;
|
|
rply.rm_reply.rp_stat = MSG_ACCEPTED;
|
|
rply.acpted_rply.ar_verf = xprt->xp_verf;
|
|
rply.acpted_rply.ar_stat = PROG_MISMATCH;
|
|
rply.acpted_rply.ar_vers.low = (u_int32_t)low_vers;
|
|
rply.acpted_rply.ar_vers.high = (u_int32_t)high_vers;
|
|
SVC_REPLY(xprt, &rply);
|
|
}
|
|
|
|
/* ******************* SERVER INPUT STUFF ******************* */
|
|
|
|
/*
|
|
* Get server side input from some transport.
|
|
*
|
|
* Statement of authentication parameters management:
|
|
* This function owns and manages all authentication parameters, specifically
|
|
* the "raw" parameters (msg.rm_call.cb_cred and msg.rm_call.cb_verf) and
|
|
* the "cooked" credentials (rqst->rq_clntcred).
|
|
* However, this function does not know the structure of the cooked
|
|
* credentials, so it make the following assumptions:
|
|
* a) the structure is contiguous (no pointers), and
|
|
* b) the cred structure size does not exceed RQCRED_SIZE bytes.
|
|
* In all events, all three parameters are freed upon exit from this routine.
|
|
* The storage is trivially management on the call stack in user land, but
|
|
* is mallocated in kernel land.
|
|
*/
|
|
|
|
void
|
|
svc_getreq(rdfds)
|
|
int rdfds;
|
|
{
|
|
fd_set readfds;
|
|
|
|
FD_ZERO(&readfds);
|
|
readfds.fds_bits[0] = rdfds;
|
|
svc_getreqset(&readfds);
|
|
}
|
|
|
|
void
|
|
svc_getreqset(readfds)
|
|
fd_set *readfds;
|
|
{
|
|
int bit, fd;
|
|
fd_mask mask, *maskp;
|
|
int sock;
|
|
|
|
assert(readfds != NULL);
|
|
|
|
maskp = readfds->fds_bits;
|
|
for (sock = 0; sock < FD_SETSIZE; sock += NFDBITS) {
|
|
for (mask = *maskp++; (bit = ffs(mask)) != 0;
|
|
mask ^= (1 << (bit - 1))) {
|
|
/* sock has input waiting */
|
|
fd = sock + bit - 1;
|
|
svc_getreq_common(fd);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
svc_getreq_common(fd)
|
|
int fd;
|
|
{
|
|
SVCXPRT *xprt;
|
|
struct svc_req r;
|
|
struct rpc_msg msg;
|
|
int prog_found;
|
|
rpcvers_t low_vers;
|
|
rpcvers_t high_vers;
|
|
enum xprt_stat stat;
|
|
char cred_area[2*MAX_AUTH_BYTES + RQCRED_SIZE];
|
|
|
|
msg.rm_call.cb_cred.oa_base = cred_area;
|
|
msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]);
|
|
r.rq_clntcred = &(cred_area[2*MAX_AUTH_BYTES]);
|
|
|
|
rwlock_rdlock(&svc_fd_lock);
|
|
xprt = xports[fd];
|
|
rwlock_unlock(&svc_fd_lock);
|
|
if (xprt == NULL)
|
|
/* But do we control sock? */
|
|
return;
|
|
/* now receive msgs from xprtprt (support batch calls) */
|
|
do {
|
|
if (SVC_RECV(xprt, &msg)) {
|
|
|
|
/* now find the exported program and call it */
|
|
struct svc_callout *s;
|
|
enum auth_stat why;
|
|
|
|
r.rq_xprt = xprt;
|
|
r.rq_prog = msg.rm_call.cb_prog;
|
|
r.rq_vers = msg.rm_call.cb_vers;
|
|
r.rq_proc = msg.rm_call.cb_proc;
|
|
r.rq_cred = msg.rm_call.cb_cred;
|
|
/* first authenticate the message */
|
|
if ((why = _authenticate(&r, &msg)) != AUTH_OK) {
|
|
svcerr_auth(xprt, why);
|
|
goto call_done;
|
|
}
|
|
/* now match message with a registered service*/
|
|
prog_found = FALSE;
|
|
low_vers = (rpcvers_t) -1L;
|
|
high_vers = (rpcvers_t) 0L;
|
|
for (s = svc_head; s != NULL; s = s->sc_next) {
|
|
if (s->sc_prog == r.rq_prog) {
|
|
if (s->sc_vers == r.rq_vers) {
|
|
(*s->sc_dispatch)(&r, xprt);
|
|
goto call_done;
|
|
} /* found correct version */
|
|
prog_found = TRUE;
|
|
if (s->sc_vers < low_vers)
|
|
low_vers = s->sc_vers;
|
|
if (s->sc_vers > high_vers)
|
|
high_vers = s->sc_vers;
|
|
} /* found correct program */
|
|
}
|
|
/*
|
|
* if we got here, the program or version
|
|
* is not served ...
|
|
*/
|
|
if (prog_found)
|
|
svcerr_progvers(xprt, low_vers, high_vers);
|
|
else
|
|
svcerr_noprog(xprt);
|
|
/* Fall through to ... */
|
|
}
|
|
/*
|
|
* Check if the xprt has been disconnected in a
|
|
* recursive call in the service dispatch routine.
|
|
* If so, then break.
|
|
*/
|
|
rwlock_rdlock(&svc_fd_lock);
|
|
if (xprt != xports[fd]) {
|
|
rwlock_unlock(&svc_fd_lock);
|
|
break;
|
|
}
|
|
rwlock_unlock(&svc_fd_lock);
|
|
call_done:
|
|
if ((stat = SVC_STAT(xprt)) == XPRT_DIED){
|
|
SVC_DESTROY(xprt);
|
|
break;
|
|
}
|
|
} while (stat == XPRT_MOREREQS);
|
|
}
|
|
|
|
|
|
void
|
|
svc_getreq_poll(pfdp, pollretval)
|
|
struct pollfd *pfdp;
|
|
int pollretval;
|
|
{
|
|
int i;
|
|
int fds_found;
|
|
|
|
for (i = fds_found = 0; fds_found < pollretval; i++) {
|
|
struct pollfd *p = &pfdp[i];
|
|
|
|
if (p->revents) {
|
|
/* fd has input waiting */
|
|
fds_found++;
|
|
/*
|
|
* We assume that this function is only called
|
|
* via someone _select()ing from svc_fdset or
|
|
* _poll()ing from svc_pollset[]. Thus it's safe
|
|
* to handle the POLLNVAL event by simply turning
|
|
* the corresponding bit off in svc_fdset. The
|
|
* svc_pollset[] array is derived from svc_fdset
|
|
* and so will also be updated eventually.
|
|
*
|
|
* XXX Should we do an xprt_unregister() instead?
|
|
*/
|
|
if (p->revents & POLLNVAL) {
|
|
rwlock_wrlock(&svc_fd_lock);
|
|
FD_CLR(p->fd, &svc_fdset);
|
|
rwlock_unlock(&svc_fd_lock);
|
|
} else
|
|
svc_getreq_common(p->fd);
|
|
}
|
|
}
|
|
}
|