sys/rpc/svc.h

/*	$NetBSD: svc.h,v 1.17 2000/06/02 22:57:56 fvdl Exp $	*/

/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 *
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 *
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 *
 *	from: @(#)svc.h 1.35 88/12/17 SMI
 *	from: @(#)svc.h      1.27    94/04/25 SMI
 * $FreeBSD: head/sys/rpc/svc.h 177633 2008-03-26 15:23:12Z dfr $
 */

/*
 * svc.h, Server-side remote procedure call interface.
 *
 * Copyright (C) 1986-1993 by Sun Microsystems, Inc.
 */

#ifndef _RPC_SVC_H
#define _RPC_SVC_H
#include <sys/cdefs.h>

#ifdef _KERNEL
#include <sys/queue.h>
#include <sys/_lock.h>
#include <sys/_mutex.h>
#endif

/*
 * 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.
 */

/*
 *      Service control requests
 */
#define SVCGET_VERSQUIET	1
#define SVCSET_VERSQUIET	2
#define SVCGET_CONNMAXREC	3
#define SVCSET_CONNMAXREC	4

/*
 * Operations for rpc_control().
 */
#define RPC_SVC_CONNMAXREC_SET  0	/* set max rec size, enable nonblock */
#define RPC_SVC_CONNMAXREC_GET  1

enum xprt_stat {
	XPRT_DIED,
	XPRT_MOREREQS,
	XPRT_IDLE
};

struct __rpc_svcxprt;

struct xp_ops {
	/* receive incoming requests */
	bool_t	(*xp_recv)(struct __rpc_svcxprt *, struct rpc_msg *);
	/* get transport status */
	enum xprt_stat (*xp_stat)(struct __rpc_svcxprt *);
	/* get arguments */
	bool_t	(*xp_getargs)(struct __rpc_svcxprt *, xdrproc_t, void *);
	/* send reply */
	bool_t	(*xp_reply)(struct __rpc_svcxprt *, struct rpc_msg *);
	/* free mem allocated for args */
	bool_t	(*xp_freeargs)(struct __rpc_svcxprt *, xdrproc_t, void *);
	/* destroy this struct */
	void	(*xp_destroy)(struct __rpc_svcxprt *);
#ifdef _KERNEL
	/* catch-all function */
	bool_t  (*xp_control)(struct __rpc_svcxprt *, const u_int, void *);
#endif
};

#ifndef _KERNEL
struct xp_ops2 {
	/* catch-all function */
	bool_t  (*xp_control)(struct __rpc_svcxprt *, const u_int, void *);
};
#endif

#ifdef _KERNEL
struct __rpc_svcpool;
#endif

/*
 * Server side transport handle
 */
typedef struct __rpc_svcxprt {
#ifdef _KERNEL
	struct mtx	xp_lock;
	struct __rpc_svcpool *xp_pool;  /* owning pool (see below) */
	TAILQ_ENTRY(__rpc_svcxprt) xp_link;
	TAILQ_ENTRY(__rpc_svcxprt) xp_alink;
	bool_t		xp_registered;	/* xprt_register has been called */
	bool_t		xp_active;	/* xprt_active has been called */
	struct socket*	xp_socket;
	const struct xp_ops *xp_ops;
	char		*xp_netid;	/* network token */
	struct netbuf	xp_ltaddr;	/* local transport address */
	struct netbuf	xp_rtaddr;	/* remote transport address */
	struct opaque_auth xp_verf;	/* raw response verifier */
	uint32_t	xp_xid;		/* current transaction ID */
	XDR		xp_xdrreq;	/* xdr stream for decoding request */
	XDR		xp_xdrrep;	/* xdr stream for encoding reply */
	void		*xp_p1;		/* private: for use by svc ops */
	void		*xp_p2;		/* private: for use by svc ops */
	void		*xp_p3;		/* private: for use by svc lib */
	int		xp_type;	/* transport type */
#else
	int		xp_fd;
	u_short		xp_port;	 /* associated port number */
	const struct xp_ops *xp_ops;
	int		xp_addrlen;	 /* length of remote address */
	struct sockaddr_in xp_raddr;	 /* remote addr. (backward ABI compat) */
	/* XXX - fvdl stick this here for ABI backward compat reasons */
	const struct xp_ops2 *xp_ops2;
	char		*xp_tp;		 /* transport provider device name */
	char		*xp_netid;	 /* network token */
	struct netbuf	xp_ltaddr;	 /* local transport address */
	struct netbuf	xp_rtaddr;	 /* remote transport address */
	struct opaque_auth xp_verf;	 /* raw response verifier */
	void		*xp_p1;		 /* private: for use by svc ops */
	void		*xp_p2;		 /* private: for use by svc ops */
	void		*xp_p3;		 /* private: for use by svc lib */
	int		xp_type;	 /* transport type */
#endif
} SVCXPRT;

#ifdef _KERNEL

/*
 * The services list
 * Each entry represents a set of procedures (an rpc program).
 * The dispatch routine takes request structs and runs the
 * apropriate procedure.
 */
struct svc_callout {
	TAILQ_ENTRY(svc_callout) sc_link;
	rpcprog_t	    sc_prog;
	rpcvers_t	    sc_vers;
	char		   *sc_netid;
	void		    (*sc_dispatch)(struct svc_req *, SVCXPRT *);
};
TAILQ_HEAD(svc_callout_list, svc_callout);

/*
 * In the kernel, we can't use global variables to store lists of
 * transports etc. since otherwise we could not have two unrelated RPC
 * services running, each on its own thread. We solve this by
 * importing a tiny part of a Solaris kernel concept, SVCPOOL.
 *
 * A service pool contains a set of transports and service callbacks
 * for a set of related RPC services. The pool handle should be passed
 * when creating new transports etc. Future work may include extending
 * this to support something similar to the Solaris multi-threaded RPC
 * server.
 */
TAILQ_HEAD(svcxprt_list, __rpc_svcxprt);
typedef struct __rpc_svcpool {
	struct mtx	sp_lock;	/* protect the transport lists */
	struct svcxprt_list sp_xlist;	/* all transports in the pool */
	struct svcxprt_list sp_active;	/* transports needing service */
	struct svc_callout_list sp_callouts; /* (prog,vers)->dispatch list */
	bool_t		sp_exited;	/* true if shutting down */
} SVCPOOL;

#endif

/*
 * Service request
 */
struct svc_req {
	uint32_t	rq_prog;	/* service program number */
	uint32_t	rq_vers;	/* service protocol version */
	uint32_t	rq_proc;	/* the desired procedure */
	struct opaque_auth rq_cred;	/* raw creds from the wire */
	void		*rq_clntcred;	/* read only cooked cred */
	SVCXPRT		*rq_xprt;	/* associated transport */
};

/*
 *  Approved way of getting address of caller
 */
#define svc_getrpccaller(x) (&(x)->xp_rtaddr)

/*
 * Operations defined on an SVCXPRT handle
 *
 * SVCXPRT		*xprt;
 * struct rpc_msg	*msg;
 * xdrproc_t		 xargs;
 * void *		 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)

#ifdef _KERNEL
#define SVC_CONTROL(xprt, rq, in)			\
	(*(xprt)->xp_ops->xp_control)((xprt), (rq), (in))
#else
#define SVC_CONTROL(xprt, rq, in)			\
	(*(xprt)->xp_ops2->xp_control)((xprt), (rq), (in))
#endif

/*
 * Service registration
 *
 * svc_reg(xprt, prog, vers, dispatch, nconf)
 *	const SVCXPRT *xprt;
 *	const rpcprog_t prog;
 *	const rpcvers_t vers;
 *	const void (*dispatch)();
 *	const struct netconfig *nconf;
 */

__BEGIN_DECLS
extern bool_t	svc_reg(SVCXPRT *, const rpcprog_t, const rpcvers_t,
			void (*)(struct svc_req *, SVCXPRT *),
			const struct netconfig *);
__END_DECLS

/*
 * Service un-registration
 *
 * svc_unreg(prog, vers)
 *	const rpcprog_t prog;
 *	const rpcvers_t vers;
 */

__BEGIN_DECLS
#ifdef _KERNEL
extern void	svc_unreg(SVCPOOL *, const rpcprog_t, const rpcvers_t);
#else
extern void	svc_unreg(const rpcprog_t, const rpcvers_t);
#endif
__END_DECLS

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

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

#ifdef _KERNEL

/*
 * Called when a transport has pending requests.
 */
__BEGIN_DECLS
extern void	xprt_active(SVCXPRT *);
extern void	xprt_inactive(SVCXPRT *);
__END_DECLS

#endif

/*
 * 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!
 */

__BEGIN_DECLS
extern bool_t	svc_sendreply(SVCXPRT *, xdrproc_t, void *);
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 *);
extern int	rpc_reg(rpcprog_t, rpcvers_t, rpcproc_t,
			char *(*)(char *), xdrproc_t, xdrproc_t,
			char *);
__END_DECLS

/*
 * 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).
 */

#ifndef _KERNEL
/*
 * 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;
#define svc_fds svc_fdset.fds_bits[0]	/* compatibility */
#else
extern int svc_fds;
#endif /* def FD_SETSIZE */
#endif

/*
 * a small program implemented by the svc_rpc implementation itself;
 * also see clnt.h for protocol numbers.
 */
__BEGIN_DECLS
extern void rpctest_service(void);
__END_DECLS

__BEGIN_DECLS
#ifndef _KERNEL
extern void	svc_getreq(int);
extern void	svc_getreqset(fd_set *);
extern void	svc_getreq_common(int);
struct pollfd;
extern void	svc_getreq_poll(struct pollfd *, int);
extern void	svc_run(void);
extern void	svc_exit(void);
#else
extern void	svc_run(SVCPOOL *);
extern void	svc_exit(SVCPOOL *);
#endif
__END_DECLS

/*
 * Socket to use on svcxxx_create call to get default socket
 */
#define	RPC_ANYSOCK	-1
#define RPC_ANYFD	RPC_ANYSOCK

/*
 * These are the existing service side transport implementations
 */

__BEGIN_DECLS

#ifdef _KERNEL

/*
 * Create a new service pool.
 */
extern SVCPOOL* svcpool_create(void);

/*
 * Destroy a service pool, including all registered transports.
 */
extern void svcpool_destroy(SVCPOOL *pool);

/*
 * Transport independent svc_create routine.
 */
extern int svc_create(SVCPOOL *, void (*)(struct svc_req *, SVCXPRT *),
    const rpcprog_t, const rpcvers_t, const char *);
/*
 *      void (*dispatch)();             -- dispatch routine
 *      const rpcprog_t prognum;        -- program number
 *      const rpcvers_t versnum;        -- version number
 *      const char *nettype;            -- network type
 */


/*
 * Generic server creation routine. It takes a netconfig structure
 * instead of a nettype.
 */

extern SVCXPRT *svc_tp_create(SVCPOOL *, void (*)(struct svc_req *, SVCXPRT *),
    const rpcprog_t, const rpcvers_t, const char *uaddr,
    const struct netconfig *);
        /*
         * void (*dispatch)();            -- dispatch routine
         * const rpcprog_t prognum;       -- program number
         * const rpcvers_t versnum;       -- version number
	 * const char *uaddr;		  -- universal address of service
         * const struct netconfig *nconf; -- netconfig structure
         */

extern SVCXPRT *svc_dg_create(SVCPOOL *, struct socket *,
    const size_t, const size_t);
        /*
         * struct socket *;                             -- open connection
         * const size_t sendsize;                        -- max send size
         * const size_t recvsize;                        -- max recv size
         */

extern SVCXPRT *svc_vc_create(SVCPOOL *, struct socket *,
    const size_t, const size_t);
        /*
         * struct socket *;                             -- open connection
         * const size_t sendsize;                        -- max send size
         * const size_t recvsize;                        -- max recv size
         */

/*
 * Generic TLI create routine
 */
extern SVCXPRT *svc_tli_create(SVCPOOL *, struct socket *,
    const struct netconfig *, const struct t_bind *, const size_t, const size_t);
/*
 *      struct socket * so;             -- connection end point
 *      const struct netconfig *nconf;  -- netconfig structure for network
 *      const struct t_bind *bindaddr;  -- local bind address
 *      const size_t sendsz;             -- max sendsize
 *      const size_t recvsz;             -- max recvsize
 */

#else /* !_KERNEL */

/*
 * Transport independent svc_create routine.
 */
extern int svc_create(void (*)(struct svc_req *, SVCXPRT *),
			   const rpcprog_t, const rpcvers_t, const char *);
/*
 *      void (*dispatch)();             -- dispatch routine
 *      const rpcprog_t prognum;        -- program number
 *      const rpcvers_t versnum;        -- version number
 *      const char *nettype;            -- network type
 */


/*
 * Generic server creation routine. It takes a netconfig structure
 * instead of a nettype.
 */

extern SVCXPRT *svc_tp_create(void (*)(struct svc_req *, SVCXPRT *),
				   const rpcprog_t, const rpcvers_t,
				   const struct netconfig *);
        /*
         * void (*dispatch)();            -- dispatch routine
         * const rpcprog_t prognum;       -- program number
         * const rpcvers_t versnum;       -- version number
         * const struct netconfig *nconf; -- netconfig structure
         */

/*
 * Generic TLI create routine
 */
extern SVCXPRT *svc_tli_create(const int, const struct netconfig *,
			       const struct t_bind *, const u_int,
			       const u_int);
/*
 *      const int fd;                   -- connection end point
 *      const struct netconfig *nconf;  -- netconfig structure for network
 *      const struct t_bind *bindaddr;  -- local bind address
 *      const u_int sendsz;             -- max sendsize
 *      const u_int recvsz;             -- max recvsize
 */

/*
 * Connectionless and connectionful create routines
 */

extern SVCXPRT *svc_vc_create(const int, const u_int, const u_int);
/*
 *      const int fd;                           -- open connection end point
 *      const u_int sendsize;                   -- max send size
 *      const u_int recvsize;                   -- max recv size
 */

/*
 * Added for compatibility to old rpc 4.0. Obsoleted by svc_vc_create().
 */
extern SVCXPRT *svcunix_create(int, u_int, u_int, char *);

extern SVCXPRT *svc_dg_create(const int, const u_int, const u_int);
        /*
         * const int fd;                                -- open connection
         * const u_int sendsize;                        -- max send size
         * const u_int recvsize;                        -- max recv size
         */


/*
 * the routine takes any *open* connection
 * descriptor as its first input and is used for open connections.
 */
extern SVCXPRT *svc_fd_create(const int, const u_int, const u_int);
/*
 *      const int fd;                           -- open connection end point
 *      const u_int sendsize;                   -- max send size
 *      const u_int recvsize;                   -- max recv size
 */

/*
 * Added for compatibility to old rpc 4.0. Obsoleted by svc_fd_create().
 */
extern SVCXPRT *svcunixfd_create(int, u_int, u_int);

/*
 * Memory based rpc (for speed check and testing)
 */
extern SVCXPRT *svc_raw_create(void);

/*
 * svc_dg_enable_cache() enables the cache on dg transports.
 */
int svc_dg_enablecache(SVCXPRT *, const u_int);

int __rpc_get_local_uid(SVCXPRT *_transp, uid_t *_uid);

#endif	/* !_KERNEL */

__END_DECLS

#ifndef _KERNEL
/* for backward compatibility */
#include <rpc/svc_soc.h>
#endif

#endif /* !_RPC_SVC_H */