include/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, MERCHANTABILITY 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  *      from: @(#)svc.h 1.20 88/02/08 SMI
  30  *      from: @(#)svc.h 2.2 88/07/29 4.0 RPCSRC
  31  * $FreeBSD: src/include/rpc/svc.h,v 1.16 1999/12/29 05:00:43 peter Exp $
  32  * $DragonFly: src/include/rpc/svc.h,v 1.3 2003/11/14 01:01:50 dillon Exp $
  33  */
  34
  35 /*
  36  * svc.h, Server-side remote procedure call interface.
  37  *
  38  * Copyright (C) 1984, Sun Microsystems, Inc.
  39  */
  40
  41 #ifndef _RPC_SVC_H
  42 #define _RPC_SVC_H
  43 #include <sys/cdefs.h>
  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 struct rpc_msg;
  74
  75 /*
  76  * Server side transport handle
  77  */
  78 typedef struct __rpc_svcxprt {
  79         int             xp_sock;
  80         u_short         xp_port;         /* associated port number */
  81         struct xp_ops {
  82             /* receive incoming requests */
  83             bool_t      (*xp_recv) (struct __rpc_svcxprt *,
  84                                 struct rpc_msg *);
  85             /* get transport status */
  86             enum xprt_stat (*xp_stat) (struct __rpc_svcxprt *);
  87             /* get arguments */
  88             bool_t      (*xp_getargs) (struct __rpc_svcxprt *, xdrproc_t,
  89                                 caddr_t);
  90             /* send reply */
  91             bool_t      (*xp_reply) (struct __rpc_svcxprt *,
  92                                 struct rpc_msg *);
  93             /* free mem allocated for args */
  94             bool_t      (*xp_freeargs) (struct __rpc_svcxprt *, xdrproc_t,
  95                                 caddr_t);
  96             /* destroy this struct */
  97             void        (*xp_destroy) (struct __rpc_svcxprt *);
  98         } *xp_ops;
  99         int             xp_addrlen;      /* length of remote address */
 100         struct sockaddr_in xp_raddr;     /* remote address */
 101         struct opaque_auth xp_verf;      /* raw response verifier */
 102         caddr_t         xp_p1;           /* private */
 103         caddr_t         xp_p2;           /* private */
 104 } SVCXPRT;
 105
 106 /*
 107  *  Approved way of getting address of caller
 108  */
 109 #define svc_getcaller(x) (&(x)->xp_raddr)
 110
 111 /*
 112  * Operations defined on an SVCXPRT handle
 113  *
 114  * SVCXPRT              *xprt;
 115  * struct rpc_msg       *msg;
 116  * xdrproc_t             xargs;
 117  * caddr_t               argsp;
 118  */
 119 #define SVC_RECV(xprt, msg)                             \
 120         (*(xprt)->xp_ops->xp_recv)((xprt), (msg))
 121 #define svc_recv(xprt, msg)                             \
 122         (*(xprt)->xp_ops->xp_recv)((xprt), (msg))
 123
 124 #define SVC_STAT(xprt)                                  \
 125         (*(xprt)->xp_ops->xp_stat)(xprt)
 126 #define svc_stat(xprt)                                  \
 127         (*(xprt)->xp_ops->xp_stat)(xprt)
 128
 129 #define SVC_GETARGS(xprt, xargs, argsp)                 \
 130         (*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
 131 #define svc_getargs(xprt, xargs, argsp)                 \
 132         (*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
 133
 134 #define SVC_REPLY(xprt, msg)                            \
 135         (*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
 136 #define svc_reply(xprt, msg)                            \
 137         (*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
 138
 139 #define SVC_FREEARGS(xprt, xargs, argsp)                \
 140         (*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
 141 #define svc_freeargs(xprt, xargs, argsp)                \
 142         (*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
 143
 144 #define SVC_DESTROY(xprt)                               \
 145         (*(xprt)->xp_ops->xp_destroy)(xprt)
 146 #define svc_destroy(xprt)                               \
 147         (*(xprt)->xp_ops->xp_destroy)(xprt)
 148
 149
 150 /*
 151  * Service request
 152  */
 153 struct svc_req {
 154         u_int32_t       rq_prog;        /* service program number */
 155         u_int32_t       rq_vers;        /* service protocol version */
 156         u_int32_t       rq_proc;        /* the desired procedure */
 157         struct opaque_auth rq_cred;     /* raw creds from the wire */
 158         caddr_t         rq_clntcred;    /* read only cooked cred */
 159         SVCXPRT *rq_xprt;               /* associated transport */
 160 };
 161
 162
 163 /*
 164  * Service registration
 165  *
 166  * svc_register(xprt, prog, vers, dispatch, protocol)
 167  *      SVCXPRT *xprt;
 168  *      u_long prog;
 169  *      u_long vers;
 170  *      void (*dispatch)();
 171  *      int protocol;        (like TCP or UDP, zero means do not register)
 172  */
 173 __BEGIN_DECLS
 174 extern bool_t   svc_register (SVCXPRT *, u_long, u_long,
 175                         void (*) (struct svc_req *, SVCXPRT *), int);
 176 __END_DECLS
 177
 178 /*
 179  * Service un-registration
 180  *
 181  * svc_unregister(prog, vers)
 182  *      u_long prog;
 183  *      u_long vers;
 184  */
 185 __BEGIN_DECLS
 186 extern void     svc_unregister (u_long, u_long);
 187 __END_DECLS
 188
 189 /*
 190  * Transport registration.
 191  *
 192  * xprt_register(xprt)
 193  *      SVCXPRT *xprt;
 194  */
 195 __BEGIN_DECLS
 196 extern void     xprt_register   (SVCXPRT *);
 197 __END_DECLS
 198
 199 /*
 200  * Transport un-register
 201  *
 202  * xprt_unregister(xprt)
 203  *      SVCXPRT *xprt;
 204  */
 205 __BEGIN_DECLS
 206 extern void     xprt_unregister (SVCXPRT *);
 207 __END_DECLS
 208
 209
 210
 211
 212 /*
 213  * When the service routine is called, it must first check to see if it
 214  * knows about the procedure;  if not, it should call svcerr_noproc
 215  * and return.  If so, it should deserialize its arguments via
 216  * SVC_GETARGS (defined above).  If the deserialization does not work,
 217  * svcerr_decode should be called followed by a return.  Successful
 218  * decoding of the arguments should be followed the execution of the
 219  * procedure's code and a call to svc_sendreply.
 220  *
 221  * Also, if the service refuses to execute the procedure due to too-
 222  * weak authentication parameters, svcerr_weakauth should be called.
 223  * Note: do not confuse access-control failure with weak authentication!
 224  *
 225  * NB: In pure implementations of rpc, the caller always waits for a reply
 226  * msg.  This message is sent when svc_sendreply is called.
 227  * Therefore pure service implementations should always call
 228  * svc_sendreply even if the function logically returns void;  use
 229  * xdr.h - xdr_void for the xdr routine.  HOWEVER, tcp based rpc allows
 230  * for the abuse of pure rpc via batched calling or pipelining.  In the
 231  * case of a batched call, svc_sendreply should NOT be called since
 232  * this would send a return message, which is what batching tries to avoid.
 233  * It is the service/protocol writer's responsibility to know which calls are
 234  * batched and which are not.  Warning: responding to batch calls may
 235  * deadlock the caller and server processes!
 236  */
 237
 238 __BEGIN_DECLS
 239 extern bool_t   svc_sendreply   (SVCXPRT *, xdrproc_t, char *);
 240 extern void     svcerr_decode   (SVCXPRT *);
 241 extern void     svcerr_weakauth (SVCXPRT *);
 242 extern void     svcerr_noproc   (SVCXPRT *);
 243 extern void     svcerr_progvers (SVCXPRT *, u_long, u_long);
 244 extern void     svcerr_auth     (SVCXPRT *, enum auth_stat);
 245 extern void     svcerr_noprog   (SVCXPRT *);
 246 extern void     svcerr_systemerr (SVCXPRT *);
 247 __END_DECLS
 248
 249 /*
 250  * Lowest level dispatching -OR- who owns this process anyway.
 251  * Somebody has to wait for incoming requests and then call the correct
 252  * service routine.  The routine svc_run does infinite waiting; i.e.,
 253  * svc_run never returns.
 254  * Since another (co-existant) package may wish to selectively wait for
 255  * incoming calls or other events outside of the rpc architecture, the
 256  * routine svc_getreq is provided.  It must be passed readfds, the
 257  * "in-place" results of a select system call (see select, section 2).
 258  */
 259
 260 /*
 261  * Global keeper of rpc service descriptors in use
 262  * dynamic; must be inspected before each call to select
 263  */
 264 extern int svc_maxfd;
 265 extern fd_set svc_fdset;
 266 #define svc_fds svc_fdset.fds_bits[0]   /* compatibility */
 267
 268 #ifndef _KERNEL
 269 /*
 270  * a small program implemented by the svc_rpc implementation itself;
 271  * also see clnt.h for protocol numbers.
 272  */
 273 extern void rpctest_service();
 274 #endif
 275
 276 __BEGIN_DECLS
 277 extern void     svc_getreq      (int);
 278 extern void     svc_getreqset   (fd_set *);
 279 extern void     svc_getreqset2  (fd_set *, int); /* XXX: nonstd, undoc */
 280 extern void     svc_run         (void);
 281 __END_DECLS
 282
 283 /*
 284  * Socket to use on svcxxx_create call to get default socket
 285  */
 286 #define RPC_ANYSOCK     -1
 287
 288 /*
 289  * These are the existing service side transport implementations
 290  */
 291
 292 /*
 293  * Memory based rpc for testing and timing.
 294  */
 295 __BEGIN_DECLS
 296 extern SVCXPRT *svcraw_create (void);
 297 __END_DECLS
 298
 299
 300 /*
 301  * Udp based rpc.
 302  */
 303 __BEGIN_DECLS
 304 extern SVCXPRT *svcudp_create (int);
 305 extern SVCXPRT *svcudp_bufcreate (int, u_int, u_int);
 306 __END_DECLS
 307
 308
 309 /*
 310  * Tcp based rpc.
 311  */
 312 __BEGIN_DECLS
 313 extern SVCXPRT *svctcp_create (int, u_int, u_int);
 314 extern SVCXPRT *svcfd_create (int, u_int, u_int);
 315 __END_DECLS
 316
 317 /*
 318  * AF_UNIX socket based rpc.
 319  */
 320 __BEGIN_DECLS
 321 extern SVCXPRT *svcunix_create (int, u_int, u_int, char *);
 322 extern SVCXPRT *svcunixfd_create (int, u_int, u_int);
 323 __END_DECLS
 324
 325 #endif /* !_RPC_SVC_H */