xref: /src/include/rpc/svc.h

/*	$NetBSD: svc.h,v 1.33 2022/05/28 21:14:56 andvar 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, MERCHANTIBILITY 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
 *	@(#)svc.h      1.27    94/04/25 SMI
 */

/*
 * 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>

#include <sys/select.h>
#include <rpc/rpc_com.h>

/*
 * 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


enum xprt_stat {
	XPRT_DIED,
	XPRT_MOREREQS,
	XPRT_IDLE
};

/*
 * Server side transport handle
 */
typedef struct __rpc_svcxprt {
	int		xp_fd;
	unsigned short	xp_port;	 /* associated port number */
	const 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,
			    caddr_t);
		/* 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,
			    caddr_t);
		/* destroy this struct */
		void	(*xp_destroy)(struct __rpc_svcxprt *);
	} *xp_ops;
	int		xp_addrlen;	 /* length of remote address */
	struct sockaddr_in xp_raddr;	 /* rem. addr. (backward ABI compat) */
	/* XXX - fvdl stick this here for ABI backward compat reasons */
	const struct xp_ops2 {
		/* catch-all function */
		bool_t  (*xp_control)(struct __rpc_svcxprt *,
					   const unsigned int, void *);
	} *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 */
} SVCXPRT;

/*
 * 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)

/*
 * NetBSD-only definition to get the creds of the caller (AF_LOCAL).
 */
#define __svc_getcallercreds(x) ((struct sockcred *)(x)->xp_p2)

/*
 * 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), ((xdrproc_t)(xargs)), (argsp))
#define svc_getargs(xprt, xargs, argsp)			\
	(*(xprt)->xp_ops->xp_getargs)((xprt), ((xdrproc_t)(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), ((xdrproc_t)(xargs)), (argsp))
#define svc_freeargs(xprt, xargs, argsp)		\
	(*(xprt)->xp_ops->xp_freeargs)((xprt), ((xdrproc_t)(xargs)), (argsp))

#define SVC_DESTROY(xprt)				\
	(*(xprt)->xp_ops->xp_destroy)(xprt)
#define svc_destroy(xprt)				\
	(*(xprt)->xp_ops->xp_destroy)(xprt)

#define SVC_CONTROL(xprt, rq, in)			\
	(*(xprt)->xp_ops2->xp_control)((xprt), (rq), (in))

/*
 * 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
extern void	svc_unreg(const rpcprog_t, const rpcvers_t);
__END_DECLS

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

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


/*
 * 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, const char *);
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-existent) 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
 */
#ifdef SVC_LEGACY
extern int svc_maxfd;
extern fd_set svc_fdset;
#else
#define svc_maxfd (*svc_fdset_getmax())
#define svc_fdset (*svc_fdset_get())
#define svc_pollfd svc_pollfd_get()
#define svc_max_pollfd (*svc_fdset_getmax())
#endif

#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.
 */
__BEGIN_DECLS
extern void rpctest_service(void);
__END_DECLS

__BEGIN_DECLS

#define SVC_FDSET_MT	1	/* each thread gets own fd_set/pollfd */
#define SVC_FDSET_POLL	2	/* use poll in svc_run */
extern void	svc_fdset_init(int);


extern void	svc_fdset_zero(void);
extern int	svc_fdset_isset(int);
extern int	svc_fdset_clr(int);
extern int	svc_fdset_set(int);

extern fd_set  *svc_fdset_get(void);
extern int	svc_fdset_getsize(int);
extern int     *svc_fdset_getmax(void);
extern fd_set  *svc_fdset_copy(const fd_set *);

extern struct pollfd *svc_pollfd_get(void);
extern int	svc_pollfd_getsize(int);
extern int     *svc_pollfd_getmax(void);
extern struct pollfd *svc_pollfd_copy(const struct pollfd *);

extern void	svc_getreq	(int);
extern void	svc_getreqset	(fd_set *);
extern void	svc_getreqset2	(fd_set *, int);
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);
__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
/*
 * 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 unsigned int,
				    const unsigned int);
/*
 *	const int fd;			-- connection end point
 *	const struct netconfig *nconf;	-- netconfig structure for network
 *	const struct t_bind *bindaddr;	-- local bind address
 *	const unsigned sendsz;		-- max sendsize
 *	const unsigned recvsz;		-- max recvsize
 */

/*
 * Connectionless and connectionful create routines
 */

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

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

/*
 * 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 unsigned int);

__END_DECLS


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

#endif /* !_RPC_SVC_H_ */