281 lines
8.6 KiB
C
281 lines
8.6 KiB
C
/* @(#)svc.h 2.2 88/07/29 4.0 RPCSRC; from 1.20 88/02/08 SMI */
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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/*
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* svc.h, Server-side remote procedure call interface.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*/
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#ifndef __SVC_HEADER__
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#define __SVC_HEADER__
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/*
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* This interface must manage two items concerning remote procedure calling:
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*
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* 1) An arbitrary number of transport connections upon which rpc requests
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* are received. The two most notable transports are TCP and UDP; they are
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* created and registered by routines in svc_tcp.c and svc_udp.c, respectively;
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* they in turn call xprt_register and xprt_unregister.
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*
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* 2) An arbitrary number of locally registered services. Services are
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* described by the following four data: program number, version number,
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* "service dispatch" function, a transport handle, and a boolean that
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* indicates whether or not the exported program should be registered with a
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* local binder service; if true the program's number and version and the
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* port number from the transport handle are registered with the binder.
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* These data are registered with the rpc svc system via svc_register.
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*
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* A service's dispatch function is called whenever an rpc request comes in
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* on a transport. The request's program and version numbers must match
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* those of the registered service. The dispatch function is passed two
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* parameters, struct svc_req * and SVCXPRT *, defined below.
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*/
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enum xprt_stat {
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XPRT_DIED,
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XPRT_MOREREQS,
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XPRT_IDLE
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};
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/*
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* Server side transport handle
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*/
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typedef struct {
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int xp_sock;
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u_short xp_port; /* associated port number */
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struct xp_ops {
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bool_t (*xp_recv)(); /* receive incomming requests */
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enum xprt_stat (*xp_stat)(); /* get transport status */
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bool_t (*xp_getargs)(); /* get arguments */
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bool_t (*xp_reply)(); /* send reply */
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bool_t (*xp_freeargs)();/* free mem allocated for args */
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void (*xp_destroy)(); /* destroy this struct */
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} *xp_ops;
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int xp_addrlen; /* length of remote address */
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struct sockaddr_in xp_raddr; /* remote address */
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struct opaque_auth xp_verf; /* raw response verifier */
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caddr_t xp_p1; /* private */
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caddr_t xp_p2; /* private */
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} SVCXPRT;
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/*
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* Approved way of getting address of caller
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*/
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#define svc_getcaller(x) (&(x)->xp_raddr)
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/*
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* Operations defined on an SVCXPRT handle
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*
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* SVCXPRT *xprt;
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* struct rpc_msg *msg;
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* xdrproc_t xargs;
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* caddr_t argsp;
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*/
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#define SVC_RECV(xprt, msg) \
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(*(xprt)->xp_ops->xp_recv)((xprt), (msg))
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#define svc_recv(xprt, msg) \
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(*(xprt)->xp_ops->xp_recv)((xprt), (msg))
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#define SVC_STAT(xprt) \
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(*(xprt)->xp_ops->xp_stat)(xprt)
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#define svc_stat(xprt) \
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(*(xprt)->xp_ops->xp_stat)(xprt)
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#define SVC_GETARGS(xprt, xargs, argsp) \
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(*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
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#define svc_getargs(xprt, xargs, argsp) \
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(*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
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#define SVC_REPLY(xprt, msg) \
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(*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
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#define svc_reply(xprt, msg) \
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(*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
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#define SVC_FREEARGS(xprt, xargs, argsp) \
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(*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
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#define svc_freeargs(xprt, xargs, argsp) \
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(*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
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#define SVC_DESTROY(xprt) \
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(*(xprt)->xp_ops->xp_destroy)(xprt)
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#define svc_destroy(xprt) \
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(*(xprt)->xp_ops->xp_destroy)(xprt)
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/*
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* Service request
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*/
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struct svc_req {
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u_long rq_prog; /* service program number */
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u_long rq_vers; /* service protocol version */
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u_long rq_proc; /* the desired procedure */
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struct opaque_auth rq_cred; /* raw creds from the wire */
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caddr_t rq_clntcred; /* read only cooked cred */
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SVCXPRT *rq_xprt; /* associated transport */
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};
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/*
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* Service registration
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*
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* svc_register(xprt, prog, vers, dispatch, protocol)
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* SVCXPRT *xprt;
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* u_long prog;
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* u_long vers;
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* void (*dispatch)();
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* int protocol; (like TCP or UDP, zero means do not register)
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*/
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extern bool_t svc_register();
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/*
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* Service un-registration
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*
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* svc_unregister(prog, vers)
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* u_long prog;
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* u_long vers;
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*/
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extern void svc_unregister();
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/*
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* Transport registration.
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*
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* xprt_register(xprt)
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* SVCXPRT *xprt;
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*/
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extern void xprt_register();
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/*
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* Transport un-register
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*
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* xprt_unregister(xprt)
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* SVCXPRT *xprt;
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*/
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extern void xprt_unregister();
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/*
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* When the service routine is called, it must first check to see if it
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* knows about the procedure; if not, it should call svcerr_noproc
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* and return. If so, it should deserialize its arguments via
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* SVC_GETARGS (defined above). If the deserialization does not work,
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* svcerr_decode should be called followed by a return. Successful
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* decoding of the arguments should be followed the execution of the
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* procedure's code and a call to svc_sendreply.
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*
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* Also, if the service refuses to execute the procedure due to too-
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* weak authentication parameters, svcerr_weakauth should be called.
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* Note: do not confuse access-control failure with weak authentication!
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*
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* NB: In pure implementations of rpc, the caller always waits for a reply
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* msg. This message is sent when svc_sendreply is called.
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* Therefore pure service implementations should always call
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* svc_sendreply even if the function logically returns void; use
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* xdr.h - xdr_void for the xdr routine. HOWEVER, tcp based rpc allows
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* for the abuse of pure rpc via batched calling or pipelining. In the
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* case of a batched call, svc_sendreply should NOT be called since
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* this would send a return message, which is what batching tries to avoid.
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* It is the service/protocol writer's responsibility to know which calls are
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* batched and which are not. Warning: responding to batch calls may
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* deadlock the caller and server processes!
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*/
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extern bool_t svc_sendreply();
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extern void svcerr_decode();
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extern void svcerr_weakauth();
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extern void svcerr_noproc();
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extern void svcerr_progvers();
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extern void svcerr_auth();
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extern void svcerr_noprog();
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extern void svcerr_systemerr();
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/*
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* Lowest level dispatching -OR- who owns this process anyway.
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* Somebody has to wait for incoming requests and then call the correct
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* service routine. The routine svc_run does infinite waiting; i.e.,
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* svc_run never returns.
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* Since another (co-existant) package may wish to selectively wait for
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* incoming calls or other events outside of the rpc architecture, the
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* routine svc_getreq is provided. It must be passed readfds, the
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* "in-place" results of a select system call (see select, section 2).
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*/
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/*
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* Global keeper of rpc service descriptors in use
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* dynamic; must be inspected before each call to select
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*/
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#ifdef FD_SETSIZE
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extern fd_set svc_fdset;
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#define svc_fds svc_fdset.fds_bits[0] /* compatibility */
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#else
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extern int svc_fds;
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#endif /* def FD_SETSIZE */
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/*
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* a small program implemented by the svc_rpc implementation itself;
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* also see clnt.h for protocol numbers.
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*/
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extern void rpctest_service();
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extern void svc_getreq();
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extern void svc_getreqset(); /* takes fdset instead of int */
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extern void svc_run(); /* never returns */
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/*
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* Socket to use on svcxxx_create call to get default socket
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*/
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#define RPC_ANYSOCK -1
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/*
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* These are the existing service side transport implementations
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*/
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/*
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* Memory based rpc for testing and timing.
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*/
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extern SVCXPRT *svcraw_create();
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/*
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* Udp based rpc.
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*/
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extern SVCXPRT *svcudp_create();
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extern SVCXPRT *svcudp_bufcreate();
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/*
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* Tcp based rpc.
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*/
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extern SVCXPRT *svctcp_create();
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#endif !__SVC_HEADER__
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