NetBSD-5.0.2/lib/libc/rpc/svc_simple.c
/* $NetBSD: svc_simple.c,v 1.30 2008/04/25 17:44:44 christos Exp $ */
/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
/*
* Copyright (c) 1986-1991 by Sun Microsystems Inc.
*/
/* #pragma ident "@(#)svc_simple.c 1.18 94/04/24 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 <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: svc_simple.c,v 1.30 2008/04/25 17:44:44 christos Exp $");
#endif
#include "namespace.h"
#include "reentrant.h"
#include <sys/types.h>
#include <rpc/rpc.h>
#include <rpc/nettype.h>
#include <assert.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "rpc_internal.h"
#ifdef __weak_alias
__weak_alias(rpc_reg,_rpc_reg)
#endif
static void universal __P((struct svc_req *, SVCXPRT *));
static struct proglst {
char *(*p_progname) __P((char *));
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 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_err2[] = "can't get protocol info";
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(prognum, versnum, procnum, progname, inproc, outproc, nettype)
rpcprog_t prognum; /* program number */
rpcvers_t versnum; /* version number */
rpcproc_t procnum; /* procedure number */
char *(*progname) __P((char *)); /* Server routine */
xdrproc_t inproc, outproc; /* in/out XDR procedures */
char *nettype; /* nettype */
{
struct netconfig *nconf;
int done = FALSE;
void *handle;
#ifdef _REENTRANT
extern mutex_t proglst_lock;
#endif
if (procnum == NULLPROC) {
warnx("%s can't reassign procedure number %u", rpc_reg_msg,
NULLPROC);
return (-1);
}
if (nettype == NULL)
nettype = __UNCONST("netpath"); /* The default behavior */
if ((handle = __rpc_setconf(nettype)) == NULL) {
warnx(rpc_reg_err, rpc_reg_msg, __reg_err1);
return (-1);
}
/* VARIABLES PROTECTED BY proglst_lock: proglst */
mutex_lock(&proglst_lock);
while ((nconf = __rpc_getconf(handle)) != NULL) {
struct proglst *pl;
SVCXPRT *svcxprt;
int madenow;
u_int recvsz;
char *xdrbuf;
char *netid;
madenow = FALSE;
svcxprt = NULL;
recvsz = 0;
xdrbuf = NULL;
netid = 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 __rpc_sockinfo si;
svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
if (svcxprt == NULL)
continue;
if (!__rpc_fd2sockinfo(svcxprt->xp_fd, &si)) {
warnx(rpc_reg_err, rpc_reg_msg, __reg_err2);
SVC_DESTROY(svcxprt);
continue;
}
recvsz = __rpc_get_t_size(si.si_af, si.si_proto, 0);
if (recvsz == 0) {
warnx(rpc_reg_err, rpc_reg_msg, __reg_err3);
SVC_DESTROY(svcxprt);
continue;
}
if (((xdrbuf = malloc((size_t)recvsz)) == NULL) ||
((netid = strdup(nconf->nc_netid)) == NULL)) {
warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str);
if (xdrbuf != NULL)
free(xdrbuf);
if (netid != NULL)
free(netid);
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 */
(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)) {
warnx("%s couldn't register prog %u vers %u for %s",
rpc_reg_msg, (unsigned)prognum,
(unsigned)versnum, netid);
if (madenow) {
SVC_DESTROY(svcxprt);
free(xdrbuf);
free(netid);
}
continue;
}
pl = malloc(sizeof(*pl));
if (pl == NULL) {
warnx(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);
mutex_unlock(&proglst_lock);
if (done == FALSE) {
warnx("%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(rqstp, transp)
struct svc_req *rqstp;
SVCXPRT *transp;
{
rpcprog_t prog;
rpcvers_t vers;
rpcproc_t proc;
char *outdata;
char *xdrbuf;
struct proglst *pl;
#ifdef _REENTRANT
extern mutex_t proglst_lock;
#endif
_DIAGASSERT(rqstp != NULL);
_DIAGASSERT(transp != NULL);
/*
* enforce "procnum 0 is echo" convention
*/
if (rqstp->rq_proc == NULLPROC) {
if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) ==
FALSE) {
warnx("svc_sendreply failed");
}
return;
}
prog = rqstp->rq_prog;
vers = rqstp->rq_vers;
proc = rqstp->rq_proc;
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, (size_t)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);
mutex_unlock(&proglst_lock);
return;
}
outdata = (*(pl->p_progname))(xdrbuf);
if (outdata == NULL &&
pl->p_outproc != (xdrproc_t) xdr_void){
/* there was an error */
mutex_unlock(&proglst_lock);
return;
}
if (!svc_sendreply(transp, pl->p_outproc, outdata)) {
warnx(
"rpc: rpc_reg trouble replying to prog %u vers %u",
(unsigned)prog, (unsigned)vers);
mutex_unlock(&proglst_lock);
return;
}
/* free the decoded arguments */
(void) svc_freeargs(transp, pl->p_inproc, xdrbuf);
mutex_unlock(&proglst_lock);
return;
}
mutex_unlock(&proglst_lock);
/* This should never happen */
warnx("rpc: rpc_reg: never registered prog %u vers %u",
(unsigned)prog, (unsigned)vers);
return;
}