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  1. /*
  2.  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  3.  * unrestricted use provided that this legend is included on all tape
  4.  * media and as a part of the software program in whole or part.  Users
  5.  * may copy or modify Sun RPC without charge, but are not authorized
  6.  * to license or distribute it to anyone else except as part of a product or
  7.  * program developed by the user.
  8.  *
  9.  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10.  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11.  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12.  *
  13.  * Sun RPC is provided with no support and without any obligation on the
  14.  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15.  * modification or enhancement.
  16.  *
  17.  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18.  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19.  * OR ANY PART THEREOF.
  20.  *
  21.  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22.  * or profits or other special, indirect and consequential damages, even if
  23.  * Sun has been advised of the possibility of such damages.
  24.  *
  25.  * Sun Microsystems, Inc.
  26.  * 2550 Garcia Avenue
  27.  * Mountain View, California  94043
  28.  */
  29.  
  30. /*
  31.  * svc.h, Server-side remote procedure call interface.
  32.  *
  33.  * Copyright (C) 1984, Sun Microsystems, Inc.
  34.  */
  35.  
  36. #ifndef _RPC_SVC_H
  37. #define _RPC_SVC_H 1
  38.  
  39. #include <sys/cdefs.h>
  40. #include <rpc/rpc_msg.h>
  41.  
  42. __BEGIN_DECLS
  43.  
  44. /*
  45.  * This interface must manage two items concerning remote procedure calling:
  46.  *
  47.  * 1) An arbitrary number of transport connections upon which rpc requests
  48.  * are received.  The two most notable transports are TCP and UDP;  they are
  49.  * created and registered by routines in svc_tcp.c and svc_udp.c, respectively;
  50.  * they in turn call xprt_register and xprt_unregister.
  51.  *
  52.  * 2) An arbitrary number of locally registered services.  Services are
  53.  * described by the following four data: program number, version number,
  54.  * "service dispatch" function, a transport handle, and a boolean that
  55.  * indicates whether or not the exported program should be registered with a
  56.  * local binder service;  if true the program's number and version and the
  57.  * port number from the transport handle are registered with the binder.
  58.  * These data are registered with the rpc svc system via svc_register.
  59.  *
  60.  * A service's dispatch function is called whenever an rpc request comes in
  61.  * on a transport.  The request's program and version numbers must match
  62.  * those of the registered service.  The dispatch function is passed two
  63.  * parameters, struct svc_req * and SVCXPRT *, defined below.
  64.  */
  65.  
  66. enum xprt_stat {
  67.         XPRT_DIED,
  68.         XPRT_MOREREQS,
  69.         XPRT_IDLE
  70. };
  71.  
  72. /*
  73.  * Server side transport handle
  74.  */
  75. typedef struct SVCXPRT SVCXPRT;
  76. struct SVCXPRT {
  77.   int xp_sock;
  78.   unsigned short xp_port;               /* associated port number */
  79.   const struct xp_ops {
  80.     bool_t      (*xp_recv) (SVCXPRT *__xprt, struct rpc_msg *__msg);
  81.                                 /* receive incoming requests */
  82.     enum xprt_stat (*xp_stat) (SVCXPRT *__xprt);
  83.                                 /* get transport status */
  84.     bool_t      (*xp_getargs) (SVCXPRT *__xprt, xdrproc_t __xdr_args,
  85.                                char* args_ptr); /* get arguments */
  86.     bool_t      (*xp_reply) (SVCXPRT *__xprt, struct rpc_msg *__msg);
  87.                                 /* send reply */
  88.     bool_t      (*xp_freeargs) (SVCXPRT *__xprt, xdrproc_t __xdr_args,
  89.                                 char* args_ptr);
  90.                                 /* free mem allocated for args */
  91.     void        (*xp_destroy) (SVCXPRT *__xprt);
  92.                                 /* destroy this struct */
  93.   } *xp_ops;
  94.   int           xp_addrlen;      /* length of remote address */
  95.   struct sockaddr_in xp_raddr;   /* remote address */
  96.   struct opaque_auth xp_verf;    /* raw response verifier */
  97.   char*         xp_p1;           /* private */
  98.   char*         xp_p2;           /* private */
  99.   char          xp_pad [256];   /* padding, internal use */
  100. };
  101.  
  102. /*
  103.  *  Approved way of getting address of caller
  104.  */
  105. #define svc_getcaller(x) (&(x)->xp_raddr)
  106.  
  107. /*
  108.  * Operations defined on an SVCXPRT handle
  109.  *
  110.  * SVCXPRT              *xprt;
  111.  * struct rpc_msg       *msg;
  112.  * xdrproc_t             xargs;
  113.  * char*                 argsp;
  114.  */
  115. #define SVC_RECV(xprt, msg)                             \
  116.         (*(xprt)->xp_ops->xp_recv)((xprt), (msg))
  117. #define svc_recv(xprt, msg)                             \
  118.         (*(xprt)->xp_ops->xp_recv)((xprt), (msg))
  119.  
  120. #define SVC_STAT(xprt)                                  \
  121.         (*(xprt)->xp_ops->xp_stat)(xprt)
  122. #define svc_stat(xprt)                                  \
  123.         (*(xprt)->xp_ops->xp_stat)(xprt)
  124.  
  125. #define SVC_GETARGS(xprt, xargs, argsp)                 \
  126.         (*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
  127. #define svc_getargs(xprt, xargs, argsp)                 \
  128.         (*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
  129.  
  130. #define SVC_REPLY(xprt, msg)                            \
  131.         (*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
  132. #define svc_reply(xprt, msg)                            \
  133.         (*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
  134.  
  135. #define SVC_FREEARGS(xprt, xargs, argsp)                \
  136.         (*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
  137. #define svc_freeargs(xprt, xargs, argsp)                \
  138.         (*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
  139.  
  140. #define SVC_DESTROY(xprt)                               \
  141.         (*(xprt)->xp_ops->xp_destroy)(xprt)
  142. #define svc_destroy(xprt)                               \
  143.         (*(xprt)->xp_ops->xp_destroy)(xprt)
  144.  
  145.  
  146. /*
  147.  * Service request
  148.  */
  149. struct svc_req {
  150.   rpcprog_t rq_prog;            /* service program number */
  151.   rpcvers_t rq_vers;            /* service protocol version */
  152.   rpcproc_t rq_proc;            /* the desired procedure */
  153.   struct opaque_auth rq_cred;   /* raw creds from the wire */
  154.   char* rq_clntcred;          /* read only cooked cred */
  155.   SVCXPRT *rq_xprt;             /* associated transport */
  156. };
  157.  
  158. #ifndef __DISPATCH_FN_T
  159. #define __DISPATCH_FN_T
  160. typedef void (*__dispatch_fn_t) (struct svc_req*, SVCXPRT*);
  161. #endif
  162.  
  163. /*
  164.  * Service registration
  165.  *
  166.  * svc_register(xprt, prog, vers, dispatch, protocol)
  167.  *      SVCXPRT *xprt;
  168.  *      rpcprog_t prog;
  169.  *      rpcvers_t vers;
  170.  *      void (*dispatch)(struct svc_req*, SVCXPRT*);
  171.  *      rpcprot_t protocol;  like TCP or UDP, zero means do not register
  172.  */
  173. extern bool_t svc_register (SVCXPRT *__xprt, rpcprog_t __prog,
  174.                             rpcvers_t __vers, __dispatch_fn_t __dispatch,
  175.                             rpcprot_t __protocol) __THROW;
  176.  
  177. /*
  178.  * Service un-registration
  179.  *
  180.  * svc_unregister(prog, vers)
  181.  *      rpcprog_t prog;
  182.  *      rpcvers_t vers;
  183.  */
  184. extern void svc_unregister (rpcprog_t __prog, rpcvers_t __vers) __THROW;
  185.  
  186. /*
  187.  * Transport registration.
  188.  *
  189.  * xprt_register(xprt)
  190.  *      SVCXPRT *xprt;
  191.  */
  192. extern void xprt_register (SVCXPRT *__xprt) __THROW;
  193.  
  194. /*
  195.  * Transport un-register
  196.  *
  197.  * xprt_unregister(xprt)
  198.  *      SVCXPRT *xprt;
  199.  */
  200. extern void xprt_unregister (SVCXPRT *__xprt) __THROW;
  201.  
  202.  
  203. /*
  204.  * When the service routine is called, it must first check to see if it
  205.  * knows about the procedure;  if not, it should call svcerr_noproc
  206.  * and return.  If so, it should deserialize its arguments via
  207.  * SVC_GETARGS (defined above).  If the deserialization does not work,
  208.  * svcerr_decode should be called followed by a return.  Successful
  209.  * decoding of the arguments should be followed the execution of the
  210.  * procedure's code and a call to svc_sendreply.
  211.  *
  212.  * Also, if the service refuses to execute the procedure due to too-
  213.  * weak authentication parameters, svcerr_weakauth should be called.
  214.  * Note: do not confuse access-control failure with weak authentication!
  215.  *
  216.  * NB: In pure implementations of rpc, the caller always waits for a reply
  217.  * msg.  This message is sent when svc_sendreply is called.
  218.  * Therefore pure service implementations should always call
  219.  * svc_sendreply even if the function logically returns void;  use
  220.  * xdr.h - xdr_void for the xdr routine.  HOWEVER, tcp based rpc allows
  221.  * for the abuse of pure rpc via batched calling or pipelining.  In the
  222.  * case of a batched call, svc_sendreply should NOT be called since
  223.  * this would send a return message, which is what batching tries to avoid.
  224.  * It is the service/protocol writer's responsibility to know which calls are
  225.  * batched and which are not.  Warning: responding to batch calls may
  226.  * deadlock the caller and server processes!
  227.  */
  228.  
  229. extern bool_t   svc_sendreply (SVCXPRT *xprt, xdrproc_t __xdr_results,
  230.                                char* __xdr_location) __THROW;
  231.  
  232. extern void     svcerr_decode (SVCXPRT *__xprt) __THROW;
  233.  
  234. extern void     svcerr_weakauth (SVCXPRT *__xprt) __THROW;
  235.  
  236. extern void     svcerr_noproc (SVCXPRT *__xprt) __THROW;
  237.  
  238. extern void     svcerr_progvers (SVCXPRT *__xprt, rpcvers_t __low_vers,
  239.                                  rpcvers_t __high_vers) __THROW;
  240.  
  241. extern void     svcerr_auth (SVCXPRT *__xprt, enum auth_stat __why) __THROW;
  242.  
  243. extern void     svcerr_noprog (SVCXPRT *__xprt) __THROW;
  244.  
  245. extern void     svcerr_systemerr (SVCXPRT *__xprt) __THROW;
  246.  
  247. /*
  248.  * Lowest level dispatching -OR- who owns this process anyway.
  249.  * Somebody has to wait for incoming requests and then call the correct
  250.  * service routine.  The routine svc_run does infinite waiting; i.e.,
  251.  * svc_run never returns.
  252.  * Since another (coexistent) package may wish to selectively wait for
  253.  * incoming calls or other events outside of the rpc architecture, the
  254.  * routine svc_getreq is provided.  It must be passed readfds, the
  255.  * "in-place" results of a select system call (see select, section 2).
  256.  */
  257.  
  258. /*
  259.  * Global keeper of rpc service descriptors in use
  260.  * dynamic; must be inspected before each call to select
  261.  */
  262.  
  263. extern struct pollfd *svc_pollfd;
  264. extern int svc_max_pollfd;
  265. extern fd_set svc_fdset;
  266. #define svc_fds svc_fdset.fds_bits[0]   /* compatibility */
  267.  
  268. /*
  269.  * a small program implemented by the svc_rpc implementation itself;
  270.  * also see clnt.h for protocol numbers.
  271.  */
  272. extern void svc_getreq (int __rdfds) __THROW;
  273. extern void svc_getreq_common (const int __fd) __THROW;
  274. extern void svc_getreqset (fd_set *__readfds) __THROW;
  275. extern void svc_getreq_poll (struct pollfd *, const int) __THROW;
  276. extern void svc_exit (void) __THROW;
  277. extern void svc_run (void) __THROW;
  278.  
  279. /*
  280.  * Socket to use on svcxxx_create call to get default socket
  281.  */
  282. #define RPC_ANYSOCK     -1
  283.  
  284. /*
  285.  * These are the existing service side transport implementations
  286.  */
  287.  
  288. /*
  289.  * Memory based rpc for testing and timing.
  290.  */
  291. extern SVCXPRT *svcraw_create (void) __THROW;
  292.  
  293. /*
  294.  * Udp based rpc.
  295.  */
  296. extern SVCXPRT *svcudp_create (int __sock) __THROW;
  297. extern SVCXPRT *svcudp_bufcreate (int __sock, unsigned int __sendsz, unsigned int __recvsz)
  298.      __THROW;
  299.  
  300. /*
  301.  * Tcp based rpc.
  302.  */
  303. extern SVCXPRT *svctcp_create (int __sock, unsigned int __sendsize, unsigned int __recvsize)
  304.      __THROW;
  305.  
  306.  
  307. /*
  308.  * Unix based rpc.
  309.  */
  310. extern SVCXPRT *svcunix_create (int __sock, unsigned int __sendsize, unsigned int __recvsize,
  311.                                 char *__path) __THROW;
  312.  
  313.  
  314. __END_DECLS
  315.  
  316. #endif /* rpc/svc.h */
  317.