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Filename : svc.h
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/* @(#)svc.h	2.2 88/07/29 4.0 RPCSRC; from 1.20 88/02/08 SMI */
/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * All rights reserved.
 *
 * 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.
 */

/*
 * svc.h, Server-side remote procedure call interface.
 */

#ifndef GSSRPC_SVC_H
#define GSSRPC_SVC_H

#include <gssrpc/svc_auth.h>

GSSRPC__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 {
#ifdef _WIN32
        SOCKET          xp_sock;
#else
	int		xp_sock;
#endif
	u_short		xp_port;	 /* associated port number */
	struct xp_ops {
	    /* receive incoming requests */
	    bool_t	(*xp_recv)(struct SVCXPRT *, struct rpc_msg *);
	    /* get transport status */
	    enum xprt_stat (*xp_stat)(struct SVCXPRT *);
	    /* get arguments */
	    bool_t	(*xp_getargs)(struct SVCXPRT *, xdrproc_t,
				      void *);
	    /* send reply */
	    bool_t	(*xp_reply)(struct SVCXPRT *,
				    struct rpc_msg *);
            /* free mem allocated for args */
	    bool_t	(*xp_freeargs)(struct SVCXPRT *, xdrproc_t,
				       void *);
	    /* destroy this struct */
	    void	(*xp_destroy)(struct SVCXPRT *);
	} *xp_ops;
	int		xp_addrlen;	 /* length of remote address */
	struct sockaddr_in xp_raddr;	 /* remote address */
	struct opaque_auth xp_verf;	 /* raw response verifier */
	SVCAUTH		*xp_auth;	 /* auth flavor of current req */
	void		*xp_p1;		 /* private */
	void		*xp_p2;		 /* private */
	int		xp_laddrlen;	 /* length of local address */
	struct sockaddr_in xp_laddr;	 /* local address */
} SVCXPRT;

/*
 *  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_GETARGS_REQ(xprt, req, xargs, argsp)	\
	(*(xprt)->xp_ops->xp_getargs_req)((xprt), (req), (xargs), (argsp))
#define svc_getargs_req(xprt, req, xargs, argsp)	\
	(*(xprt)->xp_ops->xp_getargs_req)((xprt), (req), (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_REPLY_REQ(xprt, req, msg)			\
	(*(xprt)->xp_ops->xp_reply_req) ((xprt), (req), (msg))
#define svc_reply_req(xprt, msg)			\
	(*(xprt)->xp_ops->xp_reply_req) ((xprt), (req), (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 */
	void *		rq_clntcred;	/* read only cooked client cred */
	void *		rq_svccred;	/* read only svc cred/context */
	void *		rq_clntname;	/* read only client name */
	SVCXPRT		*rq_xprt;	/* associated transport */
	/* The request's auth flavor *should* be here, but the svc_req 	*/
	/* isn't passed around everywhere it is necessary.  The 	*/
	/* transport *is* passed around, so the auth flavor it stored 	*/
	/* there.  This means that the transport must be single 	*/
	/* threaded, but other parts of SunRPC already require that. 	*/
	/*SVCAUTH		*rq_auth;	 associated auth flavor */
};


/*
 * Service registration
 *
 * svc_register(xprt, prog, vers, dispatch, protocol)
 *	SVCXPRT *xprt;
 *	rpcprog_t prog;
 *	rpcvers_t vers;
 *	void (*dispatch)();
 *	int protocol;  like IPPROTO_TCP or _UDP; zero means do not register
 *
 * registerrpc(prog, vers, proc, routine, inproc, outproc)
 * 	returns 0 upon success, -1 if error.
 */
extern bool_t	svc_register(SVCXPRT *, rpcprog_t, rpcvers_t,
			     void (*)(struct svc_req *, SVCXPRT *), int);

extern int registerrpc(rpcprog_t, rpcvers_t, rpcproc_t,
		       char *(*)(void *),
		       xdrproc_t, xdrproc_t);

/*
 * Service un-registration
 *
 * svc_unregister(prog, vers)
 *	rpcprog_t prog;
 *	rpcvers_t vers;
 */
extern void	svc_unregister(rpcprog_t, rpcvers_t);

/*
 * Transport registration.
 *
 * xprt_register(xprt)
 *	SVCXPRT *xprt;
 */
extern void	xprt_register(SVCXPRT *);

/*
 * Transport un-register
 *
 * xprt_unregister(xprt)
 *	SVCXPRT *xprt;
 */
extern void	xprt_unregister(SVCXPRT *);


/*
 * 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 or the new SVC_GETARGS_REQ (both 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 or the new svc_sendreply_req.
 *
 * 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 *, xdrproc_t, caddr_t);
extern void	svcerr_decode(SVCXPRT *);
extern void	svcerr_weakauth(SVCXPRT *);
extern void	svcerr_noproc(SVCXPRT *);
extern void	svcerr_progvers(SVCXPRT *, rpcvers_t, rpcvers_t);
extern void	svcerr_auth(SVCXPRT *, enum auth_stat);
extern void	svcerr_noprog(SVCXPRT *);
extern void	svcerr_systemerr(SVCXPRT *);

/*
 * 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 (co-existant) 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 int svc_maxfd;
#ifdef FD_SETSIZE
extern fd_set svc_fdset;
/* RENAMED */
#define gssrpc_svc_fds gsssrpc_svc_fdset.fds_bits[0]	/* compatibility */
#else
extern int svc_fds;
#endif /* def FD_SETSIZE */
extern int svc_maxfd;

extern void	svc_getreq(int);
#ifdef FD_SETSIZE
extern void	svc_getreqset(fd_set *);/* takes fdset instead of int */
#else
extern void	svc_getreqset(int *);
#endif
extern void	svc_run(void); 	 /* never returns */

/*
 * 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);

/*
 * Udp based rpc.
 */
extern SVCXPRT *svcudp_create(int);
extern SVCXPRT *svcudp_bufcreate(int, u_int, u_int);
extern int svcudp_enablecache(SVCXPRT *, uint32_t);

/*
 * Tcp based rpc.
 */
extern SVCXPRT *svctcp_create(int, u_int, u_int);

/*
 * Like svtcp_create(), except the routine takes any *open* UNIX file
 * descriptor as its first input.
 */
extern SVCXPRT *svcfd_create(int, u_int, u_int);

/* XXX add auth_gsapi_log_*? */

GSSRPC__END_DECLS

#endif /* !defined(GSSRPC_SVC_H) */