OpenSolaris_b135/lib/libnsl/rpc/svc_simple.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley
* 4.3 BSD under license from the Regents of the University of
* California.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* svc_simple.c
* Simplified front end to rpc.
*/
/*
* This interface creates a virtual listener for all the services
* started thru rpc_reg(). It listens on the same endpoint for
* all the services and then executes the corresponding service
* for the given prognum and procnum.
*/
#include "mt.h"
#include "rpc_mt.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <rpc/rpc.h>
#include <sys/types.h>
#include <syslog.h>
#include <rpc/nettype.h>
extern int use_portmapper;
static struct proglst {
char *(*p_progname)();
rpcprog_t p_prognum;
rpcvers_t p_versnum;
rpcproc_t p_procnum;
SVCXPRT *p_transp;
char *p_netid;
char *p_xdrbuf;
int p_recvsz;
xdrproc_t p_inproc, p_outproc;
struct proglst *p_nxt;
} *proglst;
static void universal();
static const char rpc_reg_err[] = "%s: %s";
static const char rpc_reg_msg[] = "rpc_reg: ";
static const char __reg_err1[] = "can't find appropriate transport";
static const char __reg_err3[] = "unsupported transport size";
static const char __no_mem_str[] = "out of memory";
/*
* For simplified, easy to use kind of rpc interfaces.
* nettype indicates the type of transport on which the service will be
* listening. Used for conservation of the system resource. Only one
* handle is created for all the services (actually one of each netid)
* and same xdrbuf is used for same netid. The size of the arguments
* is also limited by the recvsize for that transport, even if it is
* a COTS transport. This may be wrong, but for cases like these, they
* should not use the simplified interfaces like this.
*/
int
rpc_reg(const rpcprog_t prognum, const rpcvers_t versnum,
const rpcproc_t procnum, char *(*progname)(), const xdrproc_t inproc,
const xdrproc_t outproc, const char *nettype)
{
struct netconfig *nconf;
int done = FALSE;
void *handle;
extern mutex_t proglst_lock;
if (procnum == NULLPROC) {
(void) syslog(LOG_ERR, (const char *) "%s: %s %d",
rpc_reg_msg,
(const char *) "can't reassign procedure number %d",
NULLPROC);
return (-1);
}
if (nettype == NULL)
nettype = "netpath"; /* The default behavior */
if ((handle = __rpc_setconf((char *)nettype)) == NULL) {
(void) syslog(LOG_ERR, rpc_reg_err, rpc_reg_msg, __reg_err1);
return (-1);
}
/* VARIABLES PROTECTED BY proglst_lock: proglst */
(void) mutex_lock(&proglst_lock);
while (nconf = __rpc_getconf(handle)) {
struct proglst *pl;
SVCXPRT *svcxprt;
int madenow;
uint_t recvsz;
char *xdrbuf;
char *netid;
madenow = FALSE;
svcxprt = NULL;
for (pl = proglst; pl; pl = pl->p_nxt)
if (strcmp(pl->p_netid, nconf->nc_netid) == 0) {
svcxprt = pl->p_transp;
xdrbuf = pl->p_xdrbuf;
recvsz = pl->p_recvsz;
netid = pl->p_netid;
break;
}
if (svcxprt == NULL) {
struct t_info tinfo;
svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
if (svcxprt == NULL)
continue;
if (t_getinfo(svcxprt->xp_fd, &tinfo) == -1) {
char errorstr[100];
__tli_sys_strerror(errorstr, sizeof (errorstr),
t_errno, errno);
(void) syslog(LOG_ERR, "%s : %s : %s",
rpc_reg_msg, "t_getinfo failed",
errorstr);
SVC_DESTROY(svcxprt);
continue;
}
if ((recvsz = __rpc_get_t_size(0, tinfo.tsdu)) == 0) {
(void) syslog(LOG_ERR, rpc_reg_err, rpc_reg_msg,
__reg_err3);
SVC_DESTROY(svcxprt);
continue;
}
if (((xdrbuf = malloc((unsigned)recvsz)) == NULL) ||
((netid = strdup(nconf->nc_netid)) == NULL)) {
(void) syslog(LOG_ERR, rpc_reg_err, rpc_reg_msg,
__no_mem_str);
SVC_DESTROY(svcxprt);
break;
}
madenow = TRUE;
}
/*
* Check if this (program, version, netid) had already been
* registered. The check may save a few RPC calls to rpcbind
*/
for (pl = proglst; pl; pl = pl->p_nxt)
if ((pl->p_prognum == prognum) &&
(pl->p_versnum == versnum) &&
(strcmp(pl->p_netid, netid) == 0))
break;
if (pl == NULL) { /* Not yet */
/*
* Note that if we're using a portmapper
* instead of rpcbind then we can't do an
* unregister operation here.
*
* The reason is that the portmapper unset
* operation removes all the entries for a
* given program/version regardelss of
* transport protocol.
*
* The caller of this routine needs to ensure
* that __pmap_unset() has been called for all
* program/version service pairs they plan
* to support before they start registering
* each program/version/protocol triplet.
*/
if (!use_portmapper)
(void) rpcb_unset(prognum, versnum, nconf);
} else {
/* so that svc_reg does not call rpcb_set() */
nconf = NULL;
}
if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) {
(void) syslog(LOG_ERR,
"%s couldn't register prog %d vers %d for %s",
rpc_reg_msg, prognum, versnum, netid);
if (madenow) {
SVC_DESTROY(svcxprt);
free(xdrbuf);
free(netid);
}
continue;
}
pl = malloc(sizeof (struct proglst));
if (pl == NULL) {
(void) syslog(LOG_ERR, rpc_reg_err, rpc_reg_msg,
__no_mem_str);
if (madenow) {
SVC_DESTROY(svcxprt);
free(xdrbuf);
free(netid);
}
break;
}
pl->p_progname = progname;
pl->p_prognum = prognum;
pl->p_versnum = versnum;
pl->p_procnum = procnum;
pl->p_inproc = inproc;
pl->p_outproc = outproc;
pl->p_transp = svcxprt;
pl->p_xdrbuf = xdrbuf;
pl->p_recvsz = recvsz;
pl->p_netid = netid;
pl->p_nxt = proglst;
proglst = pl;
done = TRUE;
}
__rpc_endconf(handle);
(void) mutex_unlock(&proglst_lock);
if (done == FALSE) {
(void) syslog(LOG_ERR,
(const char *) "%s cant find suitable transport for %s",
rpc_reg_msg, nettype);
return (-1);
}
return (0);
}
/*
* The universal handler for the services registered using registerrpc.
* It handles both the connectionless and the connection oriented cases.
*/
static void
universal(struct svc_req *rqstp, SVCXPRT *transp)
{
rpcprog_t prog;
rpcvers_t vers;
rpcproc_t proc;
char *outdata;
char *xdrbuf;
struct proglst *pl;
extern mutex_t proglst_lock;
/*
* enforce "procnum 0 is echo" convention
*/
if (rqstp->rq_proc == NULLPROC) {
if (svc_sendreply(transp, (xdrproc_t)xdr_void, NULL) == FALSE) {
(void) syslog(LOG_ERR,
(const char *) "svc_sendreply failed");
}
return;
}
prog = rqstp->rq_prog;
vers = rqstp->rq_vers;
proc = rqstp->rq_proc;
(void) mutex_lock(&proglst_lock);
for (pl = proglst; pl; pl = pl->p_nxt) {
if (pl->p_prognum == prog && pl->p_procnum == proc &&
pl->p_versnum == vers &&
(strcmp(pl->p_netid, transp->xp_netid) == 0)) {
/* decode arguments into a CLEAN buffer */
xdrbuf = pl->p_xdrbuf;
/* Zero the arguments: reqd ! */
(void) memset(xdrbuf, 0, pl->p_recvsz);
/*
* Assuming that sizeof (xdrbuf) would be enough
* for the arguments; if not then the program
* may bomb. BEWARE!
*/
if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) {
svcerr_decode(transp);
(void) mutex_unlock(&proglst_lock);
return;
}
outdata = (*(pl->p_progname))(xdrbuf);
if (outdata == NULL &&
pl->p_outproc != (xdrproc_t)xdr_void) {
/* there was an error */
(void) mutex_unlock(&proglst_lock);
return;
}
if (!svc_sendreply(transp, pl->p_outproc, outdata)) {
(void) syslog(LOG_ERR, (const char *)
"rpc: rpc_reg trouble replying to prog %d vers %d",
prog, vers);
(void) mutex_unlock(&proglst_lock);
return;
}
/* free the decoded arguments */
(void) svc_freeargs(transp, pl->p_inproc, xdrbuf);
(void) mutex_unlock(&proglst_lock);
return;
}
}
(void) mutex_unlock(&proglst_lock);
/* This should never happen */
(void) syslog(LOG_ERR, (const char *)
"rpc: rpc_reg: never registered prog %d vers %d",
prog, vers);
}