sunrpc/rpc/svc.h

   1 /* @(#)svc.h    2.2 88/07/29 4.0 RPCSRC; from 1.20 88/02/08 SMI */
   2 /*
   3  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   4  * unrestricted use provided that this legend is included on all tape
   5  * media and as a part of the software program in whole or part.  Users
   6  * may copy or modify Sun RPC without charge, but are not authorized
   7  * to license or distribute it to anyone else except as part of a product or
   8  * program developed by the user.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  */
  30
  31 /*
  32  * svc.h, Server-side remote procedure call interface.
  33  *
  34  * Copyright (C) 1984, Sun Microsystems, Inc.
  35  */
  36
  37 #ifndef __SVC_HEADER__
  38 #define __SVC_HEADER__
  39
  40 #include <features.h>
  41 #include <rpc/rpc_msg.h>
  42
  43 __BEGIN_DECLS
  44
  45 /*
  46  * This interface must manage two items concerning remote procedure calling:
  47  *
  48  * 1) An arbitrary number of transport connections upon which rpc requests
  49  * are received.  The two most notable transports are TCP and UDP;  they are
  50  * created and registered by routines in svc_tcp.c and svc_udp.c, respectively;
  51  * they in turn call xprt_register and xprt_unregister.
  52  *
  53  * 2) An arbitrary number of locally registered services.  Services are
  54  * described by the following four data: program number, version number,
  55  * "service dispatch" function, a transport handle, and a boolean that
  56  * indicates whether or not the exported program should be registered with a
  57  * local binder service;  if true the program's number and version and the
  58  * port number from the transport handle are registered with the binder.
  59  * These data are registered with the rpc svc system via svc_register.
  60  *
  61  * A service's dispatch function is called whenever an rpc request comes in
  62  * on a transport.  The request's program and version numbers must match
  63  * those of the registered service.  The dispatch function is passed two
  64  * parameters, struct svc_req * and SVCXPRT *, defined below.
  65  */
  66
  67 enum xprt_stat {
  68         XPRT_DIED,
  69         XPRT_MOREREQS,
  70         XPRT_IDLE
  71 };
  72
  73 /*
  74  * Server side transport handle
  75  */
  76 typedef struct SVCXPRT SVCXPRT;
  77 struct SVCXPRT {
  78   int xp_sock;
  79   u_short xp_port;              /* associated port number */
  80   const struct xp_ops {
  81     bool_t      (*xp_recv) __P ((SVCXPRT *__xprt, struct rpc_msg *__msg));
  82                                 /* receive incoming requests */
  83     enum xprt_stat (*xp_stat) __P ((SVCXPRT *__xprt));
  84                                 /* get transport status */
  85     bool_t      (*xp_getargs) __P ((SVCXPRT *__xprt, xdrproc_t __xdr_args,
  86                                     caddr_t args_ptr)); /* get arguments */
  87     bool_t      (*xp_reply) __P ((SVCXPRT *__xprt, struct rpc_msg *__msg));
  88                                 /* send reply */
  89     bool_t      (*xp_freeargs) __P ((SVCXPRT *__xprt, xdrproc_t __xdr_args,
  90                                      caddr_t args_ptr));
  91                                 /* free mem allocated for args */
  92     void        (*xp_destroy) __P ((SVCXPRT *__xprt));
  93                                 /* destroy this struct */
  94   } *xp_ops;
  95   int           xp_addrlen;      /* length of remote address */
  96   struct sockaddr_in xp_raddr;   /* remote address */
  97   struct opaque_auth xp_verf;    /* raw response verifier */
  98   caddr_t               xp_p1;           /* private */
  99   caddr_t               xp_p2;           /* private */
 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  * caddr_t               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         u_long          rq_prog;        /* service program number */
 151         u_long          rq_vers;        /* service protocol version */
 152         u_long          rq_proc;        /* the desired procedure */
 153         struct opaque_auth rq_cred;     /* raw creds from the wire */
 154         caddr_t         rq_clntcred;    /* read only cooked cred */
 155         SVCXPRT *rq_xprt;               /* associated transport */
 156 };
 157
 158
 159 /*
 160  * Service registration
 161  *
 162  * svc_register(xprt, prog, vers, dispatch, protocol)
 163  *      SVCXPRT *xprt;
 164  *      u_long prog;
 165  *      u_long vers;
 166  *      void (*dispatch)();
 167  *      u_long protocol;  like TCP or UDP, zero means do not register
 168  */
 169 extern bool_t   svc_register __P ((SVCXPRT *__xprt, u_long __prog,
 170                                    u_long __vers, void (*__dispatch)
 171                                    __P ((struct svc_req *, SVCXPRT *)),
 172                                    u_long __protocol));
 173
 174 /*
 175  * Service un-registration
 176  *
 177  * svc_unregister(prog, vers)
 178  *      u_long prog;
 179  *      u_long vers;
 180  */
 181 extern void     svc_unregister __P ((u_long __prog, u_long __vers));
 182
 183 /*
 184  * Transport registration.
 185  *
 186  * xprt_register(xprt)
 187  *      SVCXPRT *xprt;
 188  */
 189 extern void     xprt_register __P ((SVCXPRT *__xprt));
 190
 191 /*
 192  * Transport un-register
 193  *
 194  * xprt_unregister(xprt)
 195  *      SVCXPRT *xprt;
 196  */
 197 extern void     xprt_unregister __P ((SVCXPRT *__xprt));
 198
 199
 200
 201
 202 /*
 203  * When the service routine is called, it must first check to see if it
 204  * knows about the procedure;  if not, it should call svcerr_noproc
 205  * and return.  If so, it should deserialize its arguments via
 206  * SVC_GETARGS (defined above).  If the deserialization does not work,
 207  * svcerr_decode should be called followed by a return.  Successful
 208  * decoding of the arguments should be followed the execution of the
 209  * procedure's code and a call to svc_sendreply.
 210  *
 211  * Also, if the service refuses to execute the procedure due to too-
 212  * weak authentication parameters, svcerr_weakauth should be called.
 213  * Note: do not confuse access-control failure with weak authentication!
 214  *
 215  * NB: In pure implementations of rpc, the caller always waits for a reply
 216  * msg.  This message is sent when svc_sendreply is called.
 217  * Therefore pure service implementations should always call
 218  * svc_sendreply even if the function logically returns void;  use
 219  * xdr.h - xdr_void for the xdr routine.  HOWEVER, tcp based rpc allows
 220  * for the abuse of pure rpc via batched calling or pipelining.  In the
 221  * case of a batched call, svc_sendreply should NOT be called since
 222  * this would send a return message, which is what batching tries to avoid.
 223  * It is the service/protocol writer's responsibility to know which calls are
 224  * batched and which are not.  Warning: responding to batch calls may
 225  * deadlock the caller and server processes!
 226  */
 227
 228 extern bool_t   svc_sendreply __P ((SVCXPRT *xprt, xdrproc_t __xdr_results,
 229                                     caddr_t __xdr_location));
 230
 231 extern void     svcerr_decode __P ((SVCXPRT *__xprt));
 232
 233 extern void     svcerr_weakauth __P ((SVCXPRT *__xprt));
 234
 235 extern void     svcerr_noproc __P ((SVCXPRT *__xprt));
 236
 237 extern void     svcerr_progvers __P ((SVCXPRT *__xprt, u_long __low_vers,
 238                                       u_long __high_vers));
 239
 240 extern void     svcerr_auth __P ((SVCXPRT *__xprt, enum auth_stat __why));
 241
 242 extern void     svcerr_noprog __P ((SVCXPRT *__xprt));
 243
 244 extern void     svcerr_systemerr __P ((SVCXPRT *__xprt));
 245
 246 /*
 247  * Lowest level dispatching -OR- who owns this process anyway.
 248  * Somebody has to wait for incoming requests and then call the correct
 249  * service routine.  The routine svc_run does infinite waiting; i.e.,
 250  * svc_run never returns.
 251  * Since another (coexistent) package may wish to selectively wait for
 252  * incoming calls or other events outside of the rpc architecture, the
 253  * routine svc_getreq is provided.  It must be passed readfds, the
 254  * "in-place" results of a select system call (see select, section 2).
 255  */
 256
 257 /*
 258  * Global keeper of rpc service descriptors in use
 259  * dynamic; must be inspected before each call to select
 260  */
 261 #ifdef FD_SETSIZE
 262 extern fd_set svc_fdset;
 263 #define svc_fds svc_fdset.fds_bits[0]   /* compatibility */
 264 #else
 265 extern int svc_fds;
 266 #endif /* def FD_SETSIZE */
 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 __P ((int __rdfds));
 273 extern void svc_getreqset __P ((fd_set *__readfds));
 274 extern void svc_exit __P ((void));
 275 extern void svc_run __P ((void));
 276
 277 /*
 278  * Socket to use on svcxxx_create call to get default socket
 279  */
 280 #define RPC_ANYSOCK     -1
 281
 282 /*
 283  * These are the existing service side transport implementations
 284  */
 285
 286 /*
 287  * Memory based rpc for testing and timing.
 288  */
 289 extern SVCXPRT *svcraw_create __P ((void));
 290
 291 /*
 292  * Udp based rpc.
 293  */
 294 extern SVCXPRT *svcudp_create __P ((int __sock));
 295 extern SVCXPRT *svcudp_bufcreate __P ((int __sock, u_int __sendsz,
 296                                        u_int __recvsz));
 297
 298 /*
 299  * Tcp based rpc.
 300  */
 301 extern SVCXPRT *svctcp_create __P ((int __sock, u_int __sendsize,
 302                                     u_int __recvsize));
 303
 304
 305 __END_DECLS
 306
 307 #endif /* !__SVC_HEADER__ */