sunrpc/rpc/svc.h

   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 <features.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   u_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                                caddr_t 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                                 caddr_t 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   caddr_t               xp_p1;           /* private */
  98   caddr_t               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  * 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   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   caddr_t 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                                caddr_t __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, u_int __sendsz, u_int __recvsz)
 298      __THROW;
 299
 300 /*
 301  * Tcp based rpc.
 302  */
 303 extern SVCXPRT *svctcp_create (int __sock, u_int __sendsize, u_int __recvsize)
 304      __THROW;
 305
 306 /*
 307  * FD based rpc.
 308  */
 309 extern SVCXPRT *svcfd_create (int __sock, u_int __sendsize, u_int __recvsize)
 310      __THROW;
 311
 312 /*
 313  * Unix based rpc.
 314  */
 315 extern SVCXPRT *svcunix_create (int __sock, u_int __sendsize, u_int __recvsize,
 316                                 char *__path) __THROW;
 317
 318
 319 __END_DECLS
 320
 321 #endif /* rpc/svc.h */