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/*

 * 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

 */

/*

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

 *

 * Copyright (C) 1984, Sun Microsystems, Inc.

 */

#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;

/*

 * Unix based rpc.

 */

extern SVCXPRT *svcunix_create (int __sock, u_int __sendsize, u_int __recvsize,

                                char *__path) __THROW;

__END_DECLS

#endif /* rpc/svc.h */