/* @(#)svc.h 2.2 88/07/29 4.0 RPCSRC; from 1.20 88/02/08 SMI */ /* * 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) __PMT ((SVCXPRT *__xprt, struct rpc_msg *__msg)); /* receive incoming requests */ enum xprt_stat (*xp_stat) __PMT ((SVCXPRT *__xprt)); /* get transport status */ bool_t (*xp_getargs) __PMT ((SVCXPRT *__xprt, xdrproc_t __xdr_args, caddr_t args_ptr)); /* get arguments */ bool_t (*xp_reply) __PMT ((SVCXPRT *__xprt, struct rpc_msg *__msg)); /* send reply */ bool_t (*xp_freeargs) __PMT ((SVCXPRT *__xprt, xdrproc_t __xdr_args, caddr_t args_ptr)); /* free mem allocated for args */ void (*xp_destroy) __PMT ((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 */ }; /* * 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 { u_long rq_prog; /* service program number */ u_long rq_vers; /* service protocol version */ u_long 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) __PMT ((struct svc_req*, SVCXPRT*)); #endif /* * Service registration * * svc_register(xprt, prog, vers, dispatch, protocol) * SVCXPRT *xprt; * u_long prog; * u_long vers; * void (*dispatch)(); * u_long protocol; like TCP or UDP, zero means do not register */ extern bool_t svc_register __P ((SVCXPRT *__xprt, u_long __prog, u_long __vers, __dispatch_fn_t __dispatch, u_long __protocol)); /* * Service un-registration * * svc_unregister(prog, vers) * u_long prog; * u_long vers; */ extern void svc_unregister __P ((u_long __prog, u_long __vers)); /* * Transport registration. * * xprt_register(xprt) * SVCXPRT *xprt; */ extern void xprt_register __P ((SVCXPRT *__xprt)); /* * Transport un-register * * xprt_unregister(xprt) * SVCXPRT *xprt; */ extern void xprt_unregister __P ((SVCXPRT *__xprt)); /* * 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 __P ((SVCXPRT *xprt, xdrproc_t __xdr_results, caddr_t __xdr_location)); extern void svcerr_decode __P ((SVCXPRT *__xprt)); extern void svcerr_weakauth __P ((SVCXPRT *__xprt)); extern void svcerr_noproc __P ((SVCXPRT *__xprt)); extern void svcerr_progvers __P ((SVCXPRT *__xprt, u_long __low_vers, u_long __high_vers)); extern void svcerr_auth __P ((SVCXPRT *__xprt, enum auth_stat __why)); extern void svcerr_noprog __P ((SVCXPRT *__xprt)); extern void svcerr_systemerr __P ((SVCXPRT *__xprt)); /* * 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 */ #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 */ /* * a small program implemented by the svc_rpc implementation itself; * also see clnt.h for protocol numbers. */ extern void svc_getreq __P ((int __rdfds)); extern void svc_getreqset __P ((fd_set *__readfds)); extern void svc_exit __P ((void)); extern void svc_run __P ((void)); /* * 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 __P ((void)); /* * Udp based rpc. */ extern SVCXPRT *svcudp_create __P ((int __sock)); extern SVCXPRT *svcudp_bufcreate __P ((int __sock, u_int __sendsz, u_int __recvsz)); /* * Tcp based rpc. */ extern SVCXPRT *svctcp_create __P ((int __sock, u_int __sendsize, u_int __recvsize)); /* * Unix based rpc. */ extern SVCXPRT *svcunix_create __P ((int __sock, u_int __sendsize, u_int __recvsize, char *__path)); __END_DECLS #endif /* rpc/svc.h */