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337 lines
11 KiB
C
337 lines
11 KiB
C
8 years ago
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/*
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* svc.h, Server-side remote procedure call interface.
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*
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* Copyright (C) 2012-2016 Free Software Foundation, Inc.
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* This file is part of the GNU C Library.
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*
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* The GNU C Library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* The GNU C Library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with the GNU C Library; if not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Copyright (c) 2010, Oracle America, Inc.
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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
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the "Oracle America, 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
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _RPC_SVC_H
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#define _RPC_SVC_H 1
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#include <features.h>
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#include <rpc/rpc_msg.h>
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__BEGIN_DECLS
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/*
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* This interface must manage two items concerning remote procedure calling:
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*
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* 1) An arbitrary number of transport connections upon which rpc requests
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* are received. The two most notable transports are TCP and UDP; they are
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* created and registered by routines in svc_tcp.c and svc_udp.c, respectively;
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* they in turn call xprt_register and xprt_unregister.
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*
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* 2) An arbitrary number of locally registered services. Services are
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* described by the following four data: program number, version number,
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* "service dispatch" function, a transport handle, and a boolean that
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* indicates whether or not the exported program should be registered with a
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* local binder service; if true the program's number and version and the
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* port number from the transport handle are registered with the binder.
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* These data are registered with the rpc svc system via svc_register.
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*
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* A service's dispatch function is called whenever an rpc request comes in
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* on a transport. The request's program and version numbers must match
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* those of the registered service. The dispatch function is passed two
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* parameters, struct svc_req * and SVCXPRT *, defined below.
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*/
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enum xprt_stat {
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XPRT_DIED,
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XPRT_MOREREQS,
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XPRT_IDLE
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};
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/*
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* Server side transport handle
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*/
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typedef struct SVCXPRT SVCXPRT;
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struct SVCXPRT {
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int xp_sock;
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u_short xp_port; /* associated port number */
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const struct xp_ops {
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bool_t (*xp_recv) (SVCXPRT *__xprt, struct rpc_msg *__msg);
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/* receive incoming requests */
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enum xprt_stat (*xp_stat) (SVCXPRT *__xprt);
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/* get transport status */
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bool_t (*xp_getargs) (SVCXPRT *__xprt, xdrproc_t __xdr_args,
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caddr_t __args_ptr); /* get arguments */
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bool_t (*xp_reply) (SVCXPRT *__xprt, struct rpc_msg *__msg);
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/* send reply */
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bool_t (*xp_freeargs) (SVCXPRT *__xprt, xdrproc_t __xdr_args,
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caddr_t __args_ptr);
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/* free mem allocated for args */
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void (*xp_destroy) (SVCXPRT *__xprt);
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/* destroy this struct */
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} *xp_ops;
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int xp_addrlen; /* length of remote address */
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struct sockaddr_in xp_raddr; /* remote address */
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struct opaque_auth xp_verf; /* raw response verifier */
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caddr_t xp_p1; /* private */
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caddr_t xp_p2; /* private */
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char xp_pad [256]; /* padding, internal use */
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};
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/*
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* Approved way of getting address of caller
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*/
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#define svc_getcaller(x) (&(x)->xp_raddr)
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/*
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* Operations defined on an SVCXPRT handle
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*
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* SVCXPRT *xprt;
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* struct rpc_msg *msg;
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* xdrproc_t xargs;
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* caddr_t argsp;
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*/
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#define SVC_RECV(xprt, msg) \
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(*(xprt)->xp_ops->xp_recv)((xprt), (msg))
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#define svc_recv(xprt, msg) \
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(*(xprt)->xp_ops->xp_recv)((xprt), (msg))
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#define SVC_STAT(xprt) \
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(*(xprt)->xp_ops->xp_stat)(xprt)
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#define svc_stat(xprt) \
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(*(xprt)->xp_ops->xp_stat)(xprt)
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#define SVC_GETARGS(xprt, xargs, argsp) \
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(*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
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#define svc_getargs(xprt, xargs, argsp) \
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(*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
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#define SVC_REPLY(xprt, msg) \
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(*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
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#define svc_reply(xprt, msg) \
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(*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
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#define SVC_FREEARGS(xprt, xargs, argsp) \
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(*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
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#define svc_freeargs(xprt, xargs, argsp) \
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(*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
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#define SVC_DESTROY(xprt) \
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(*(xprt)->xp_ops->xp_destroy)(xprt)
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#define svc_destroy(xprt) \
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(*(xprt)->xp_ops->xp_destroy)(xprt)
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/*
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* Service request
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*/
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struct svc_req {
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rpcprog_t rq_prog; /* service program number */
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rpcvers_t rq_vers; /* service protocol version */
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rpcproc_t rq_proc; /* the desired procedure */
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struct opaque_auth rq_cred; /* raw creds from the wire */
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caddr_t rq_clntcred; /* read only cooked cred */
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SVCXPRT *rq_xprt; /* associated transport */
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};
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#ifndef __DISPATCH_FN_T
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#define __DISPATCH_FN_T
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typedef void (*__dispatch_fn_t) (struct svc_req*, SVCXPRT*);
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#endif
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/*
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* Service registration
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*
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* svc_register(xprt, prog, vers, dispatch, protocol)
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* SVCXPRT *xprt;
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* rpcprog_t prog;
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* rpcvers_t vers;
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* void (*dispatch)(struct svc_req*, SVCXPRT*);
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* rpcprot_t protocol; like TCP or UDP, zero means do not register
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*/
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extern bool_t svc_register (SVCXPRT *__xprt, rpcprog_t __prog,
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rpcvers_t __vers, __dispatch_fn_t __dispatch,
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rpcprot_t __protocol) __THROW;
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/*
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* Service un-registration
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*
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* svc_unregister(prog, vers)
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* rpcprog_t prog;
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* rpcvers_t vers;
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*/
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extern void svc_unregister (rpcprog_t __prog, rpcvers_t __vers) __THROW;
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/*
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* Transport registration.
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*
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* xprt_register(xprt)
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* SVCXPRT *xprt;
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*/
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extern void xprt_register (SVCXPRT *__xprt) __THROW;
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/*
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* Transport un-register
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*
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* xprt_unregister(xprt)
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* SVCXPRT *xprt;
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*/
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extern void xprt_unregister (SVCXPRT *__xprt) __THROW;
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/*
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* When the service routine is called, it must first check to see if it
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* knows about the procedure; if not, it should call svcerr_noproc
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* and return. If so, it should deserialize its arguments via
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* SVC_GETARGS (defined above). If the deserialization does not work,
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* svcerr_decode should be called followed by a return. Successful
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* decoding of the arguments should be followed the execution of the
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* procedure's code and a call to svc_sendreply.
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*
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* Also, if the service refuses to execute the procedure due to too-
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* weak authentication parameters, svcerr_weakauth should be called.
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* Note: do not confuse access-control failure with weak authentication!
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*
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* NB: In pure implementations of rpc, the caller always waits for a reply
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* msg. This message is sent when svc_sendreply is called.
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* Therefore pure service implementations should always call
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* svc_sendreply even if the function logically returns void; use
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* xdr.h - xdr_void for the xdr routine. HOWEVER, tcp based rpc allows
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* for the abuse of pure rpc via batched calling or pipelining. In the
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* case of a batched call, svc_sendreply should NOT be called since
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* this would send a return message, which is what batching tries to avoid.
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* It is the service/protocol writer's responsibility to know which calls are
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* batched and which are not. Warning: responding to batch calls may
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* deadlock the caller and server processes!
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*/
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extern bool_t svc_sendreply (SVCXPRT *__xprt, xdrproc_t __xdr_results,
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caddr_t __xdr_location) __THROW;
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extern void svcerr_decode (SVCXPRT *__xprt) __THROW;
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extern void svcerr_weakauth (SVCXPRT *__xprt) __THROW;
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extern void svcerr_noproc (SVCXPRT *__xprt) __THROW;
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extern void svcerr_progvers (SVCXPRT *__xprt, rpcvers_t __low_vers,
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rpcvers_t __high_vers) __THROW;
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extern void svcerr_auth (SVCXPRT *__xprt, enum auth_stat __why) __THROW;
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extern void svcerr_noprog (SVCXPRT *__xprt) __THROW;
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extern void svcerr_systemerr (SVCXPRT *__xprt) __THROW;
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/*
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* Lowest level dispatching -OR- who owns this process anyway.
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* Somebody has to wait for incoming requests and then call the correct
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* service routine. The routine svc_run does infinite waiting; i.e.,
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* svc_run never returns.
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* Since another (coexistent) package may wish to selectively wait for
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* incoming calls or other events outside of the rpc architecture, the
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* routine svc_getreq is provided. It must be passed readfds, the
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* "in-place" results of a select system call (see select, section 2).
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*/
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/*
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* Global keeper of rpc service descriptors in use
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* dynamic; must be inspected before each call to select
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*/
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extern struct pollfd *svc_pollfd;
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extern int svc_max_pollfd;
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extern fd_set svc_fdset;
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#define svc_fds svc_fdset.fds_bits[0] /* compatibility */
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/*
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* a small program implemented by the svc_rpc implementation itself;
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* also see clnt.h for protocol numbers.
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*/
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extern void svc_getreq (int __rdfds) __THROW;
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extern void svc_getreq_common (const int __fd) __THROW;
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extern void svc_getreqset (fd_set *__readfds) __THROW;
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extern void svc_getreq_poll (struct pollfd *, const int) __THROW;
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extern void svc_exit (void) __THROW;
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extern void svc_run (void) __THROW;
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/*
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* Socket to use on svcxxx_create call to get default socket
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*/
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#define RPC_ANYSOCK -1
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/*
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* These are the existing service side transport implementations
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*/
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/*
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* Memory based rpc for testing and timing.
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*/
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extern SVCXPRT *svcraw_create (void) __THROW;
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/*
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* Udp based rpc.
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*/
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extern SVCXPRT *svcudp_create (int __sock) __THROW;
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extern SVCXPRT *svcudp_bufcreate (int __sock, u_int __sendsz, u_int __recvsz)
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__THROW;
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/*
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* Tcp based rpc.
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*/
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extern SVCXPRT *svctcp_create (int __sock, u_int __sendsize, u_int __recvsize)
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__THROW;
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/*
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* FD based rpc.
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*/
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extern SVCXPRT *svcfd_create (int __sock, u_int __sendsize, u_int __recvsize)
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__THROW;
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/*
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* Unix based rpc.
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*/
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extern SVCXPRT *svcunix_create (int __sock, u_int __sendsize, u_int __recvsize,
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char *__path) __THROW;
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__END_DECLS
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#endif /* rpc/svc.h */
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