mirror of
https://git.FreeBSD.org/src.git
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ea85a1540a
Similar to r300836, cl and ct will always be non-NULL as they're allocated using the mem_alloc routines, which always use `malloc(..., M_WAITOK)`. Deobfuscating the cleanup path fixes a leak where if cl was NULL and ct was not, ct would not be free'd, and also removes a duplicate test for cl not being NULL. Approved by: re (gjb) Differential Revision: https://reviews.freebsd.org/D6801 MFC after: 1 week Reported by: Coverity CID: 1229999 Reviewed by: cem Sponsored by: EMC / Isilon Storage Division
589 lines
15 KiB
C
589 lines
15 KiB
C
/* $NetBSD: clnt_vc.c,v 1.4 2000/07/14 08:40:42 fvdl Exp $ */
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/*-
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* Copyright (c) 2009, Sun Microsystems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of Sun Microsystems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char *sccsid2 = "@(#)clnt_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro";
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static char *sccsid = "@(#)clnt_tcp.c 2.2 88/08/01 4.0 RPCSRC";
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static char sccsid3[] = "@(#)clnt_vc.c 1.19 89/03/16 Copyr 1988 Sun Micro";
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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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* clnt_tcp.c, Implements a TCP/IP based, client side RPC.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*
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* TCP based RPC supports 'batched calls'.
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* A sequence of calls may be batched-up in a send buffer. The rpc call
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* return immediately to the client even though the call was not necessarily
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* sent. The batching occurs if the results' xdr routine is NULL (0) AND
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* the rpc timeout value is zero (see clnt.h, rpc).
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*
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* Clients should NOT casually batch calls that in fact return results; that is,
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* the server side should be aware that a call is batched and not produce any
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* return message. Batched calls that produce many result messages can
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* deadlock (netlock) the client and the server....
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*
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* Now go hang yourself.
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*/
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/*
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* This code handles the special case of a NFSv4.n backchannel for
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* callback RPCs. It is similar to clnt_vc.c, but uses the TCP
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* connection provided by the client to the server.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mutex.h>
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#include <sys/pcpu.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sx.h>
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#include <sys/syslog.h>
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#include <sys/time.h>
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#include <sys/uio.h>
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#include <net/vnet.h>
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#include <netinet/tcp.h>
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#include <rpc/rpc.h>
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#include <rpc/rpc_com.h>
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#include <rpc/krpc.h>
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struct cmessage {
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struct cmsghdr cmsg;
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struct cmsgcred cmcred;
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};
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static void clnt_bck_geterr(CLIENT *, struct rpc_err *);
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static bool_t clnt_bck_freeres(CLIENT *, xdrproc_t, void *);
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static void clnt_bck_abort(CLIENT *);
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static bool_t clnt_bck_control(CLIENT *, u_int, void *);
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static void clnt_bck_close(CLIENT *);
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static void clnt_bck_destroy(CLIENT *);
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static struct clnt_ops clnt_bck_ops = {
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.cl_abort = clnt_bck_abort,
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.cl_geterr = clnt_bck_geterr,
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.cl_freeres = clnt_bck_freeres,
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.cl_close = clnt_bck_close,
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.cl_destroy = clnt_bck_destroy,
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.cl_control = clnt_bck_control
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};
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/*
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* Create a client handle for a connection.
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* Default options are set, which the user can change using clnt_control()'s.
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* This code handles the special case of an NFSv4.1 session backchannel
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* call, which is sent on a TCP connection created against the server
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* by a client.
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*/
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void *
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clnt_bck_create(
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struct socket *so, /* Server transport socket. */
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const rpcprog_t prog, /* program number */
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const rpcvers_t vers) /* version number */
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{
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CLIENT *cl; /* client handle */
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struct ct_data *ct = NULL; /* client handle */
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struct timeval now;
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struct rpc_msg call_msg;
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static uint32_t disrupt;
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XDR xdrs;
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if (disrupt == 0)
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disrupt = (uint32_t)(long)so;
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cl = (CLIENT *)mem_alloc(sizeof (*cl));
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ct = (struct ct_data *)mem_alloc(sizeof (*ct));
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mtx_init(&ct->ct_lock, "ct->ct_lock", NULL, MTX_DEF);
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ct->ct_threads = 0;
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ct->ct_closing = FALSE;
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ct->ct_closed = FALSE;
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ct->ct_upcallrefs = 0;
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ct->ct_closeit = FALSE;
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/*
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* Set up private data struct
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*/
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ct->ct_wait.tv_sec = -1;
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ct->ct_wait.tv_usec = -1;
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/*
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* Initialize call message
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*/
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getmicrotime(&now);
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ct->ct_xid = ((uint32_t)++disrupt) ^ __RPC_GETXID(&now);
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call_msg.rm_xid = ct->ct_xid;
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call_msg.rm_direction = CALL;
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call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
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call_msg.rm_call.cb_prog = (uint32_t)prog;
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call_msg.rm_call.cb_vers = (uint32_t)vers;
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/*
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* pre-serialize the static part of the call msg and stash it away
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*/
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xdrmem_create(&xdrs, ct->ct_mcallc, MCALL_MSG_SIZE,
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XDR_ENCODE);
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if (!xdr_callhdr(&xdrs, &call_msg))
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goto err;
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ct->ct_mpos = XDR_GETPOS(&xdrs);
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XDR_DESTROY(&xdrs);
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ct->ct_waitchan = "rpcbck";
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ct->ct_waitflag = 0;
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cl->cl_refs = 1;
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cl->cl_ops = &clnt_bck_ops;
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cl->cl_private = ct;
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cl->cl_auth = authnone_create();
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TAILQ_INIT(&ct->ct_pending);
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return (cl);
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err:
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mtx_destroy(&ct->ct_lock);
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mem_free(ct, sizeof (struct ct_data));
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mem_free(cl, sizeof (CLIENT));
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return (NULL);
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}
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enum clnt_stat
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clnt_bck_call(
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CLIENT *cl, /* client handle */
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struct rpc_callextra *ext, /* call metadata */
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rpcproc_t proc, /* procedure number */
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struct mbuf *args, /* pointer to args */
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struct mbuf **resultsp, /* pointer to results */
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struct timeval utimeout,
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SVCXPRT *xprt)
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{
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struct ct_data *ct = (struct ct_data *) cl->cl_private;
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AUTH *auth;
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struct rpc_err *errp;
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enum clnt_stat stat;
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XDR xdrs;
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struct rpc_msg reply_msg;
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bool_t ok;
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int nrefreshes = 2; /* number of times to refresh cred */
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struct timeval timeout;
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uint32_t xid;
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struct mbuf *mreq = NULL, *results;
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struct ct_request *cr;
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int error;
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cr = malloc(sizeof(struct ct_request), M_RPC, M_WAITOK);
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mtx_lock(&ct->ct_lock);
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if (ct->ct_closing || ct->ct_closed) {
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mtx_unlock(&ct->ct_lock);
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free(cr, M_RPC);
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return (RPC_CANTSEND);
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}
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ct->ct_threads++;
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if (ext) {
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auth = ext->rc_auth;
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errp = &ext->rc_err;
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} else {
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auth = cl->cl_auth;
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errp = &ct->ct_error;
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}
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cr->cr_mrep = NULL;
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cr->cr_error = 0;
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if (ct->ct_wait.tv_usec == -1)
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timeout = utimeout; /* use supplied timeout */
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else
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timeout = ct->ct_wait; /* use default timeout */
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call_again:
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mtx_assert(&ct->ct_lock, MA_OWNED);
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ct->ct_xid++;
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xid = ct->ct_xid;
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mtx_unlock(&ct->ct_lock);
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/*
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* Leave space to pre-pend the record mark.
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*/
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mreq = m_gethdr(M_WAITOK, MT_DATA);
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mreq->m_data += sizeof(uint32_t);
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KASSERT(ct->ct_mpos + sizeof(uint32_t) <= MHLEN,
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("RPC header too big"));
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bcopy(ct->ct_mcallc, mreq->m_data, ct->ct_mpos);
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mreq->m_len = ct->ct_mpos;
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/*
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* The XID is the first thing in the request.
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*/
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*mtod(mreq, uint32_t *) = htonl(xid);
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xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
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errp->re_status = stat = RPC_SUCCESS;
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if ((!XDR_PUTINT32(&xdrs, &proc)) ||
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(!AUTH_MARSHALL(auth, xid, &xdrs,
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m_copym(args, 0, M_COPYALL, M_WAITOK)))) {
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errp->re_status = stat = RPC_CANTENCODEARGS;
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mtx_lock(&ct->ct_lock);
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goto out;
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}
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mreq->m_pkthdr.len = m_length(mreq, NULL);
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/*
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* Prepend a record marker containing the packet length.
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*/
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M_PREPEND(mreq, sizeof(uint32_t), M_WAITOK);
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*mtod(mreq, uint32_t *) =
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htonl(0x80000000 | (mreq->m_pkthdr.len - sizeof(uint32_t)));
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cr->cr_xid = xid;
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mtx_lock(&ct->ct_lock);
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/*
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* Check to see if the client end has already started to close down
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* the connection. The svc code will have set ct_error.re_status
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* to RPC_CANTRECV if this is the case.
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* If the client starts to close down the connection after this
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* point, it will be detected later when cr_error is checked,
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* since the request is in the ct_pending queue.
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*/
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if (ct->ct_error.re_status == RPC_CANTRECV) {
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if (errp != &ct->ct_error) {
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errp->re_errno = ct->ct_error.re_errno;
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errp->re_status = RPC_CANTRECV;
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}
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stat = RPC_CANTRECV;
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goto out;
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}
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TAILQ_INSERT_TAIL(&ct->ct_pending, cr, cr_link);
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mtx_unlock(&ct->ct_lock);
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/*
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* sosend consumes mreq.
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*/
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sx_xlock(&xprt->xp_lock);
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error = sosend(xprt->xp_socket, NULL, NULL, mreq, NULL, 0, curthread);
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if (error != 0) printf("sosend=%d\n", error);
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mreq = NULL;
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if (error == EMSGSIZE) {
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printf("emsgsize\n");
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SOCKBUF_LOCK(&xprt->xp_socket->so_snd);
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sbwait(&xprt->xp_socket->so_snd);
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SOCKBUF_UNLOCK(&xprt->xp_socket->so_snd);
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sx_xunlock(&xprt->xp_lock);
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AUTH_VALIDATE(auth, xid, NULL, NULL);
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mtx_lock(&ct->ct_lock);
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TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
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goto call_again;
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}
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sx_xunlock(&xprt->xp_lock);
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reply_msg.acpted_rply.ar_verf.oa_flavor = AUTH_NULL;
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reply_msg.acpted_rply.ar_verf.oa_base = cr->cr_verf;
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reply_msg.acpted_rply.ar_verf.oa_length = 0;
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reply_msg.acpted_rply.ar_results.where = NULL;
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reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
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mtx_lock(&ct->ct_lock);
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if (error) {
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TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
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errp->re_errno = error;
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errp->re_status = stat = RPC_CANTSEND;
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goto out;
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}
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/*
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* Check to see if we got an upcall while waiting for the
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* lock. In both these cases, the request has been removed
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* from ct->ct_pending.
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*/
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if (cr->cr_error) {
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TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
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errp->re_errno = cr->cr_error;
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errp->re_status = stat = RPC_CANTRECV;
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goto out;
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}
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if (cr->cr_mrep) {
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TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
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goto got_reply;
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}
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/*
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* Hack to provide rpc-based message passing
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*/
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if (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
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TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
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errp->re_status = stat = RPC_TIMEDOUT;
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goto out;
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}
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error = msleep(cr, &ct->ct_lock, ct->ct_waitflag, ct->ct_waitchan,
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tvtohz(&timeout));
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TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
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if (error) {
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/*
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* The sleep returned an error so our request is still
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* on the list. Turn the error code into an
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* appropriate client status.
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*/
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errp->re_errno = error;
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switch (error) {
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case EINTR:
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stat = RPC_INTR;
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break;
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case EWOULDBLOCK:
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stat = RPC_TIMEDOUT;
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break;
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default:
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stat = RPC_CANTRECV;
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}
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errp->re_status = stat;
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goto out;
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} else {
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/*
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* We were woken up by the svc thread. If the
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* upcall had a receive error, report that,
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* otherwise we have a reply.
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*/
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if (cr->cr_error) {
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errp->re_errno = cr->cr_error;
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errp->re_status = stat = RPC_CANTRECV;
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goto out;
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}
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}
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got_reply:
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/*
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* Now decode and validate the response. We need to drop the
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* lock since xdr_replymsg may end up sleeping in malloc.
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*/
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mtx_unlock(&ct->ct_lock);
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if (ext && ext->rc_feedback)
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ext->rc_feedback(FEEDBACK_OK, proc, ext->rc_feedback_arg);
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xdrmbuf_create(&xdrs, cr->cr_mrep, XDR_DECODE);
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ok = xdr_replymsg(&xdrs, &reply_msg);
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cr->cr_mrep = NULL;
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if (ok) {
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if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
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(reply_msg.acpted_rply.ar_stat == SUCCESS))
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errp->re_status = stat = RPC_SUCCESS;
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else
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stat = _seterr_reply(&reply_msg, errp);
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if (stat == RPC_SUCCESS) {
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results = xdrmbuf_getall(&xdrs);
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if (!AUTH_VALIDATE(auth, xid,
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&reply_msg.acpted_rply.ar_verf, &results)) {
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errp->re_status = stat = RPC_AUTHERROR;
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errp->re_why = AUTH_INVALIDRESP;
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} else {
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KASSERT(results,
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("auth validated but no result"));
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*resultsp = results;
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}
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} /* end successful completion */
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/*
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* If unsuccessful AND error is an authentication error
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* then refresh credentials and try again, else break
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*/
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else if (stat == RPC_AUTHERROR)
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/* maybe our credentials need to be refreshed ... */
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if (nrefreshes > 0 && AUTH_REFRESH(auth, &reply_msg)) {
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nrefreshes--;
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XDR_DESTROY(&xdrs);
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mtx_lock(&ct->ct_lock);
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goto call_again;
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}
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/* end of unsuccessful completion */
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/* end of valid reply message */
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} else
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errp->re_status = stat = RPC_CANTDECODERES;
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XDR_DESTROY(&xdrs);
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mtx_lock(&ct->ct_lock);
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out:
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mtx_assert(&ct->ct_lock, MA_OWNED);
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KASSERT(stat != RPC_SUCCESS || *resultsp,
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("RPC_SUCCESS without reply"));
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if (mreq != NULL)
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m_freem(mreq);
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if (cr->cr_mrep != NULL)
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m_freem(cr->cr_mrep);
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ct->ct_threads--;
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if (ct->ct_closing)
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wakeup(ct);
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mtx_unlock(&ct->ct_lock);
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if (auth && stat != RPC_SUCCESS)
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AUTH_VALIDATE(auth, xid, NULL, NULL);
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free(cr, M_RPC);
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return (stat);
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}
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static void
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clnt_bck_geterr(CLIENT *cl, struct rpc_err *errp)
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{
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struct ct_data *ct = (struct ct_data *) cl->cl_private;
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|
|
|
*errp = ct->ct_error;
|
|
}
|
|
|
|
static bool_t
|
|
clnt_bck_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
|
|
{
|
|
XDR xdrs;
|
|
bool_t dummy;
|
|
|
|
xdrs.x_op = XDR_FREE;
|
|
dummy = (*xdr_res)(&xdrs, res_ptr);
|
|
|
|
return (dummy);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static void
|
|
clnt_bck_abort(CLIENT *cl)
|
|
{
|
|
}
|
|
|
|
static bool_t
|
|
clnt_bck_control(CLIENT *cl, u_int request, void *info)
|
|
{
|
|
|
|
return (TRUE);
|
|
}
|
|
|
|
static void
|
|
clnt_bck_close(CLIENT *cl)
|
|
{
|
|
struct ct_data *ct = (struct ct_data *) cl->cl_private;
|
|
|
|
mtx_lock(&ct->ct_lock);
|
|
|
|
if (ct->ct_closed) {
|
|
mtx_unlock(&ct->ct_lock);
|
|
return;
|
|
}
|
|
|
|
if (ct->ct_closing) {
|
|
while (ct->ct_closing)
|
|
msleep(ct, &ct->ct_lock, 0, "rpcclose", 0);
|
|
KASSERT(ct->ct_closed, ("client should be closed"));
|
|
mtx_unlock(&ct->ct_lock);
|
|
return;
|
|
}
|
|
|
|
ct->ct_closing = FALSE;
|
|
ct->ct_closed = TRUE;
|
|
mtx_unlock(&ct->ct_lock);
|
|
wakeup(ct);
|
|
}
|
|
|
|
static void
|
|
clnt_bck_destroy(CLIENT *cl)
|
|
{
|
|
struct ct_data *ct = (struct ct_data *) cl->cl_private;
|
|
|
|
clnt_bck_close(cl);
|
|
|
|
mtx_destroy(&ct->ct_lock);
|
|
mem_free(ct, sizeof(struct ct_data));
|
|
if (cl->cl_netid && cl->cl_netid[0])
|
|
mem_free(cl->cl_netid, strlen(cl->cl_netid) +1);
|
|
if (cl->cl_tp && cl->cl_tp[0])
|
|
mem_free(cl->cl_tp, strlen(cl->cl_tp) +1);
|
|
mem_free(cl, sizeof(CLIENT));
|
|
}
|
|
|
|
/*
|
|
* This call is done by the svc code when a backchannel RPC reply is
|
|
* received.
|
|
*/
|
|
void
|
|
clnt_bck_svccall(void *arg, struct mbuf *mrep, uint32_t xid)
|
|
{
|
|
struct ct_data *ct = (struct ct_data *)arg;
|
|
struct ct_request *cr;
|
|
int foundreq;
|
|
|
|
mtx_lock(&ct->ct_lock);
|
|
ct->ct_upcallrefs++;
|
|
/*
|
|
* See if we can match this reply to a request.
|
|
*/
|
|
foundreq = 0;
|
|
TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
|
|
if (cr->cr_xid == xid) {
|
|
/*
|
|
* This one matches. We leave the reply mbuf list in
|
|
* cr->cr_mrep. Set the XID to zero so that we will
|
|
* ignore any duplicated replies.
|
|
*/
|
|
cr->cr_xid = 0;
|
|
cr->cr_mrep = mrep;
|
|
cr->cr_error = 0;
|
|
foundreq = 1;
|
|
wakeup(cr);
|
|
break;
|
|
}
|
|
}
|
|
|
|
ct->ct_upcallrefs--;
|
|
if (ct->ct_upcallrefs < 0)
|
|
panic("rpcvc svccall refcnt");
|
|
if (ct->ct_upcallrefs == 0)
|
|
wakeup(&ct->ct_upcallrefs);
|
|
mtx_unlock(&ct->ct_lock);
|
|
if (foundreq == 0)
|
|
m_freem(mrep);
|
|
}
|
|
|