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