OpenSolaris_b135/lib/libnsl/rpc/clnt_door.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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* clnt_doors.c, Client side for doors IPC based RPC.
*/
#include "mt.h"
#include "rpc_mt.h"
#include <rpc/rpc.h>
#include <errno.h>
#include <sys/poll.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/kstat.h>
#include <sys/time.h>
#include <door.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <alloca.h>
#include <rpc/svc_mt.h>
#include <sys/mman.h>
#include <atomic.h>
extern bool_t xdr_opaque_auth(XDR *, struct opaque_auth *);
static struct clnt_ops *clnt_door_ops();
extern int __rpc_default_door_buf_size;
extern int __rpc_min_door_buf_size;
/*
* Private data kept per client handle
*/
struct cu_data {
int cu_fd; /* door fd */
bool_t cu_closeit; /* close it on destroy */
struct rpc_err cu_error;
uint_t cu_xdrpos;
uint_t cu_sendsz; /* send size */
char cu_header[32]; /* precreated header */
};
/*
* Door IPC based client creation routine.
*
* NB: The rpch->cl_auth is initialized to null authentication.
* Caller may wish to set this something more useful.
*
* sendsz is the maximum allowable packet size that can be sent.
* 0 will cause default to be used.
*/
CLIENT *
clnt_door_create(const rpcprog_t program, const rpcvers_t version,
const uint_t sendsz)
{
CLIENT *cl = NULL; /* client handle */
struct cu_data *cu = NULL; /* private data */
struct rpc_msg call_msg;
char rendezvous[64];
int did;
struct door_info info;
XDR xdrs;
struct timeval now;
uint_t ssz;
(void) sprintf(rendezvous, RPC_DOOR_RENDEZVOUS, (int)program,
(int)version);
if ((did = open(rendezvous, O_RDONLY, 0)) < 0) {
rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
rpc_createerr.cf_error.re_errno = errno;
rpc_createerr.cf_error.re_terrno = 0;
return (NULL);
}
if (door_info(did, &info) < 0 || (info.di_attributes & DOOR_REVOKED)) {
(void) close(did);
rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
rpc_createerr.cf_error.re_errno = errno;
rpc_createerr.cf_error.re_terrno = 0;
return (NULL);
}
/*
* Determine send size
*/
if (sendsz < __rpc_min_door_buf_size)
ssz = __rpc_default_door_buf_size;
else
ssz = RNDUP(sendsz);
if ((cl = malloc(sizeof (CLIENT))) == NULL ||
(cu = malloc(sizeof (*cu))) == NULL) {
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = errno;
goto err;
}
/*
* Precreate RPC header for performance reasons.
*/
(void) gettimeofday(&now, NULL);
call_msg.rm_xid = getpid() ^ now.tv_sec ^ now.tv_usec;
call_msg.rm_call.cb_prog = program;
call_msg.rm_call.cb_vers = version;
xdrmem_create(&xdrs, cu->cu_header, sizeof (cu->cu_header), XDR_ENCODE);
if (!xdr_callhdr(&xdrs, &call_msg)) {
rpc_createerr.cf_stat = RPC_CANTENCODEARGS;
rpc_createerr.cf_error.re_errno = 0;
goto err;
}
cu->cu_xdrpos = XDR_GETPOS(&xdrs);
cu->cu_sendsz = ssz;
cu->cu_fd = did;
cu->cu_closeit = TRUE;
cl->cl_ops = clnt_door_ops();
cl->cl_private = (caddr_t)cu;
cl->cl_auth = authnone_create();
cl->cl_tp = strdup(rendezvous);
if (cl->cl_tp == NULL) {
syslog(LOG_ERR, "clnt_door_create: strdup failed");
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = errno;
goto err;
}
cl->cl_netid = strdup("door");
if (cl->cl_netid == NULL) {
syslog(LOG_ERR, "clnt_door_create: strdup failed");
if (cl->cl_tp)
free(cl->cl_tp);
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = errno;
goto err;
}
return (cl);
err:
rpc_createerr.cf_error.re_terrno = 0;
if (cl) {
free(cl);
if (cu)
free(cu);
}
(void) close(did);
return (NULL);
}
/* ARGSUSED */
static enum clnt_stat
clnt_door_call(CLIENT *cl, rpcproc_t proc, xdrproc_t xargs, caddr_t argsp,
xdrproc_t xresults, caddr_t resultsp, struct timeval utimeout)
{
/* LINTED pointer alignment */
struct cu_data *cu = (struct cu_data *)cl->cl_private;
XDR xdrs;
door_arg_t params;
char *outbuf_ref;
struct rpc_msg reply_msg;
bool_t need_to_unmap;
uint32_t xid;
int nrefreshes = 2; /* number of times to refresh cred */
rpc_callerr.re_errno = 0;
rpc_callerr.re_terrno = 0;
if ((params.rbuf = alloca(cu->cu_sendsz)) == NULL) {
rpc_callerr.re_terrno = 0;
rpc_callerr.re_errno = errno;
return (rpc_callerr.re_status = RPC_SYSTEMERROR);
}
outbuf_ref = params.rbuf;
params.rsize = cu->cu_sendsz;
if ((params.data_ptr = alloca(cu->cu_sendsz)) == NULL) {
rpc_callerr.re_terrno = 0;
rpc_callerr.re_errno = errno;
return (rpc_callerr.re_status = RPC_SYSTEMERROR);
}
call_again:
xdrmem_create(&xdrs, params.data_ptr, cu->cu_sendsz, XDR_ENCODE);
/* Increment XID (not really needed for RPC over doors...) */
/* LINTED pointer alignment */
xid = atomic_inc_uint_nv((uint32_t *)cu->cu_header);
(void) memcpy(params.data_ptr, cu->cu_header, cu->cu_xdrpos);
/* LINTED pointer alignment */
*(uint32_t *)params.data_ptr = xid;
XDR_SETPOS(&xdrs, cu->cu_xdrpos);
if ((!XDR_PUTINT32(&xdrs, (int32_t *)&proc)) ||
(!AUTH_MARSHALL(cl->cl_auth, &xdrs)) ||
(!(*xargs)(&xdrs, argsp))) {
return (rpc_callerr.re_status = RPC_CANTENCODEARGS);
}
params.data_size = (int)XDR_GETPOS(&xdrs);
params.desc_ptr = NULL;
params.desc_num = 0;
if (door_call(cu->cu_fd, ¶ms) < 0) {
rpc_callerr.re_errno = errno;
return (rpc_callerr.re_status = RPC_CANTSEND);
}
if (params.rbuf == NULL || params.rsize == 0) {
return (rpc_callerr.re_status = RPC_FAILED);
}
need_to_unmap = (params.rbuf != outbuf_ref);
/* LINTED pointer alignment */
if (*(uint32_t *)params.rbuf != xid) {
rpc_callerr.re_status = RPC_CANTDECODERES;
goto done;
}
xdrmem_create(&xdrs, params.rbuf, params.rsize, XDR_DECODE);
reply_msg.acpted_rply.ar_verf = _null_auth;
reply_msg.acpted_rply.ar_results.where = resultsp;
reply_msg.acpted_rply.ar_results.proc = xresults;
if (xdr_replymsg(&xdrs, &reply_msg)) {
if (reply_msg.rm_reply.rp_stat == MSG_ACCEPTED &&
reply_msg.acpted_rply.ar_stat == SUCCESS)
rpc_callerr.re_status = RPC_SUCCESS;
else
__seterr_reply(&reply_msg, &rpc_callerr);
if (rpc_callerr.re_status == RPC_SUCCESS) {
if (!AUTH_VALIDATE(cl->cl_auth,
&reply_msg.acpted_rply.ar_verf)) {
rpc_callerr.re_status = RPC_AUTHERROR;
rpc_callerr.re_why = AUTH_INVALIDRESP;
}
if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
xdrs.x_op = XDR_FREE;
(void) xdr_opaque_auth(&xdrs,
&(reply_msg.acpted_rply.ar_verf));
}
}
/*
* If unsuccesful AND error is an authentication error
* then refresh credentials and try again, else break
*/
else if (rpc_callerr.re_status == RPC_AUTHERROR) {
/*
* maybe our credentials need to be refreshed ...
*/
if (nrefreshes-- &&
AUTH_REFRESH(cl->cl_auth, &reply_msg)) {
if (need_to_unmap)
(void) munmap(params.rbuf,
params.rsize);
goto call_again;
} else
/*
* We are setting rpc_callerr here given that
* libnsl is not reentrant thereby
* reinitializing the TSD. If not set here then
* success could be returned even though refresh
* failed.
*/
rpc_callerr.re_status = RPC_AUTHERROR;
}
} else
rpc_callerr.re_status = RPC_CANTDECODERES;
done:
if (need_to_unmap)
(void) munmap(params.rbuf, params.rsize);
return (rpc_callerr.re_status);
}
/* ARGSUSED */
static enum clnt_stat
clnt_door_send(CLIENT *cl, rpcproc_t proc, xdrproc_t xargs, caddr_t argsp)
{
/* send() call not supported on doors */
rpc_callerr.re_errno = ENOTSUP;
rpc_callerr.re_terrno = 0;
return (rpc_callerr.re_status = RPC_FAILED);
}
static void
clnt_door_geterr(CLIENT *cl, struct rpc_err *errp)
{
/* LINTED pointer alignment */
struct cu_data *cu = (struct cu_data *)cl->cl_private;
*errp = rpc_callerr;
}
/* ARGSUSED */
static bool_t
clnt_door_freeres(CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
{
XDR xdrs;
(void) memset(&xdrs, 0, sizeof (xdrs));
xdrs.x_op = XDR_FREE;
return ((*xdr_res)(&xdrs, res_ptr));
}
static void
clnt_door_abort(CLIENT *cl)
{
cl = cl;
}
static bool_t
clnt_door_control(CLIENT *cl, int request, char *info)
{
/* LINTED pointer alignment */
struct cu_data *cu = (struct cu_data *)cl->cl_private;
switch (request) {
case CLSET_FD_CLOSE:
cu->cu_closeit = TRUE;
return (TRUE);
case CLSET_FD_NCLOSE:
cu->cu_closeit = FALSE;
return (TRUE);
}
/* for other requests which use info */
if (info == NULL)
return (FALSE);
switch (request) {
case CLGET_FD:
/* LINTED pointer alignment */
*(int *)info = cu->cu_fd;
break;
case CLGET_XID:
/*
* use the knowledge that xid is the
* first element in the call structure *.
* This will get the xid of the PREVIOUS call
*/
/* LINTED pointer alignment */
*(uint32_t *)info = ntohl(*(uint32_t *)cu->cu_header);
break;
case CLSET_XID:
/* This will set the xid of the NEXT call */
/* LINTED pointer alignment */
*(uint32_t *)cu->cu_header = htonl(*(uint32_t *)info - 1);
/* decrement by 1 as clnt_door_call() increments once */
break;
case CLGET_VERS:
/*
* This RELIES on the information that, in the call body,
* the version number field is the fifth field from the
* begining of the RPC header. MUST be changed if the
* call_struct is changed
*/
/* LINTED pointer alignment */
*(uint32_t *)info = ntohl(*(uint32_t *)(cu->cu_header +
4 * BYTES_PER_XDR_UNIT));
break;
case CLSET_VERS:
/* LINTED pointer alignment */
*(uint32_t *)(cu->cu_header + 4 * BYTES_PER_XDR_UNIT) =
/* LINTED pointer alignment */
htonl(*(uint32_t *)info);
break;
case CLGET_PROG:
/*
* This RELIES on the information that, in the call body,
* the program number field is the fourth field from the
* begining of the RPC header. MUST be changed if the
* call_struct is changed
*/
/* LINTED pointer alignment */
*(uint32_t *)info = ntohl(*(uint32_t *)(cu->cu_header +
3 * BYTES_PER_XDR_UNIT));
break;
case CLSET_PROG:
/* LINTED pointer alignment */
*(uint32_t *)(cu->cu_header + 3 * BYTES_PER_XDR_UNIT) =
/* LINTED pointer alignment */
htonl(*(uint32_t *)info);
break;
default:
return (FALSE);
}
return (TRUE);
}
static void
clnt_door_destroy(CLIENT *cl)
{
/* LINTED pointer alignment */
struct cu_data *cu = (struct cu_data *)cl->cl_private;
int cu_fd = cu->cu_fd;
if (cu->cu_closeit)
(void) close(cu_fd);
free(cu);
if (cl->cl_netid && cl->cl_netid[0])
free(cl->cl_netid);
if (cl->cl_tp && cl->cl_tp[0])
free(cl->cl_tp);
free(cl);
}
static struct clnt_ops *
clnt_door_ops(void)
{
static struct clnt_ops ops;
extern mutex_t ops_lock;
sig_mutex_lock(&ops_lock);
if (ops.cl_call == NULL) {
ops.cl_call = clnt_door_call;
ops.cl_send = clnt_door_send;
ops.cl_abort = clnt_door_abort;
ops.cl_geterr = clnt_door_geterr;
ops.cl_freeres = clnt_door_freeres;
ops.cl_destroy = clnt_door_destroy;
ops.cl_control = clnt_door_control;
}
sig_mutex_unlock(&ops_lock);
return (&ops);
}
int
_update_did(CLIENT *cl, int vers)
{
/* LINTED pointer alignment */
struct cu_data *cu = (struct cu_data *)cl->cl_private;
rpcprog_t prog;
char rendezvous[64];
if (cu->cu_fd >= 0)
(void) close(cu->cu_fd);
/* Make sure that the right door id is used in door_call. */
clnt_control(cl, CLGET_PROG, (void *)&prog);
(void) sprintf(rendezvous, RPC_DOOR_RENDEZVOUS, (int)prog, vers);
if ((cu->cu_fd = open(rendezvous, O_RDONLY, 0)) < 0) {
rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
rpc_createerr.cf_error.re_errno = errno;
rpc_createerr.cf_error.re_terrno = 0;
return (0);
}
free(cl->cl_tp);
cl->cl_tp = strdup(rendezvous);
if (cl->cl_tp == NULL) {
syslog(LOG_ERR, "_update_did: strdup failed");
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = errno;
rpc_createerr.cf_error.re_terrno = 0;
return (0);
}
return (1);
}