include/rpc/svc.h

   1 /*-
   2  * Copyright (c) 2009, Sun Microsystems, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  * - Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  * - Redistributions in binary form must reproduce the above copyright notice,
  10  *   this list of conditions and the following disclaimer in the documentation
  11  *   and/or other materials provided with the distribution.
  12  * - Neither the name of Sun Microsystems, Inc. nor the names of its
  13  *   contributors may be used to endorse or promote products derived
  14  *   from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  *      from: @(#)svc.h 1.35 88/12/17 SMI
  29  *      from: @(#)svc.h      1.27    94/04/25 SMI
  30  * $NetBSD: svc.h,v 1.17 2000/06/02 22:57:56 fvdl Exp $
  31  * $FreeBSD: src/include/rpc/svc.h,v 1.24 2003/06/15 10:32:01 mbr Exp $
  32  * $DragonFly: src/include/rpc/svc.h,v 1.4 2008/05/19 10:19:49 corecode Exp $
  33  */
  34
  35 /*
  36  * svc.h, Server-side remote procedure call interface.
  37  *
  38  * Copyright (C) 1986-1993 by Sun Microsystems, Inc.
  39  */
  40
  41 #ifndef _RPC_SVC_H
  42 #define _RPC_SVC_H
  43 #include <sys/cdefs.h>
  44 #include <sys/select.h>
  45
  46 /*
  47  * This interface must manage two items concerning remote procedure calling:
  48  *
  49  * 1) An arbitrary number of transport connections upon which rpc requests
  50  * are received.  The two most notable transports are TCP and UDP;  they are
  51  * created and registered by routines in svc_tcp.c and svc_udp.c, respectively;
  52  * they in turn call xprt_register and xprt_unregister.
  53  *
  54  * 2) An arbitrary number of locally registered services.  Services are
  55  * described by the following four data: program number, version number,
  56  * "service dispatch" function, a transport handle, and a boolean that
  57  * indicates whether or not the exported program should be registered with a
  58  * local binder service;  if true the program's number and version and the
  59  * port number from the transport handle are registered with the binder.
  60  * These data are registered with the rpc svc system via svc_register.
  61  *
  62  * A service's dispatch function is called whenever an rpc request comes in
  63  * on a transport.  The request's program and version numbers must match
  64  * those of the registered service.  The dispatch function is passed two
  65  * parameters, struct svc_req * and SVCXPRT *, defined below.
  66  */
  67
  68 /*
  69  *      Service control requests
  70  */
  71 #define SVCGET_VERSQUIET        1
  72 #define SVCSET_VERSQUIET        2
  73 #define SVCGET_CONNMAXREC       3
  74 #define SVCSET_CONNMAXREC       4
  75
  76 /*
  77  * Operations for rpc_control().
  78  */
  79 #define RPC_SVC_CONNMAXREC_SET  0       /* set max rec size, enable nonblock */
  80 #define RPC_SVC_CONNMAXREC_GET  1
  81
  82 enum xprt_stat {
  83         XPRT_DIED,
  84         XPRT_MOREREQS,
  85         XPRT_IDLE
  86 };
  87
  88 /*
  89  * Server side transport handle
  90  */
  91 typedef struct __rpc_svcxprt {
  92         int             xp_fd;
  93         u_short         xp_port;         /* associated port number */
  94         const struct xp_ops {
  95             /* receive incoming requests */
  96             bool_t      (*xp_recv)(struct __rpc_svcxprt *, struct rpc_msg *);
  97             /* get transport status */
  98             enum xprt_stat (*xp_stat)(struct __rpc_svcxprt *);
  99             /* get arguments */
 100             bool_t      (*xp_getargs)(struct __rpc_svcxprt *, xdrproc_t,
 101                                 void *);
 102             /* send reply */
 103             bool_t      (*xp_reply)(struct __rpc_svcxprt *, struct rpc_msg *);
 104             /* free mem allocated for args */
 105             bool_t      (*xp_freeargs)(struct __rpc_svcxprt *, xdrproc_t,
 106                                 void *);
 107             /* destroy this struct */
 108             void        (*xp_destroy)(struct __rpc_svcxprt *);
 109         } *xp_ops;
 110         int             xp_addrlen;      /* length of remote address */
 111         struct sockaddr_in xp_raddr;     /* remote addr. (backward ABI compat) */
 112         /* XXX - fvdl stick this here for ABI backward compat reasons */
 113         const struct xp_ops2 {
 114                 /* catch-all function */
 115                 bool_t  (*xp_control)(struct __rpc_svcxprt *, const u_int,
 116                                 void *);
 117         } *xp_ops2;
 118         char            *xp_tp;          /* transport provider device name */
 119         char            *xp_netid;       /* network token */
 120         struct netbuf   xp_ltaddr;       /* local transport address */
 121         struct netbuf   xp_rtaddr;       /* remote transport address */
 122         struct opaque_auth xp_verf;      /* raw response verifier */
 123         void            *xp_p1;          /* private: for use by svc ops */
 124         void            *xp_p2;          /* private: for use by svc ops */
 125         void            *xp_p3;          /* private: for use by svc lib */
 126         int             xp_type;         /* transport type */
 127 } SVCXPRT;
 128
 129 /*
 130  * Service request
 131  */
 132 struct svc_req {
 133         u_int32_t       rq_prog;        /* service program number */
 134         u_int32_t       rq_vers;        /* service protocol version */
 135         u_int32_t       rq_proc;        /* the desired procedure */
 136         struct opaque_auth rq_cred;     /* raw creds from the wire */
 137         void            *rq_clntcred;   /* read only cooked cred */
 138         SVCXPRT         *rq_xprt;       /* associated transport */
 139 };
 140
 141 /*
 142  *  Approved way of getting address of caller
 143  */
 144 #define svc_getrpccaller(x) (&(x)->xp_rtaddr)
 145
 146 /*
 147  * Operations defined on an SVCXPRT handle
 148  *
 149  * SVCXPRT              *xprt;
 150  * struct rpc_msg       *msg;
 151  * xdrproc_t             xargs;
 152  * void *                argsp;
 153  */
 154 #define SVC_RECV(xprt, msg)                             \
 155         (*(xprt)->xp_ops->xp_recv)((xprt), (msg))
 156 #define svc_recv(xprt, msg)                             \
 157         (*(xprt)->xp_ops->xp_recv)((xprt), (msg))
 158
 159 #define SVC_STAT(xprt)                                  \
 160         (*(xprt)->xp_ops->xp_stat)(xprt)
 161 #define svc_stat(xprt)                                  \
 162         (*(xprt)->xp_ops->xp_stat)(xprt)
 163
 164 #define SVC_GETARGS(xprt, xargs, argsp)                 \
 165         (*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
 166 #define svc_getargs(xprt, xargs, argsp)                 \
 167         (*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
 168
 169 #define SVC_REPLY(xprt, msg)                            \
 170         (*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
 171 #define svc_reply(xprt, msg)                            \
 172         (*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
 173
 174 #define SVC_FREEARGS(xprt, xargs, argsp)                \
 175         (*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
 176 #define svc_freeargs(xprt, xargs, argsp)                \
 177         (*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
 178
 179 #define SVC_DESTROY(xprt)                               \
 180         (*(xprt)->xp_ops->xp_destroy)(xprt)
 181 #define svc_destroy(xprt)                               \
 182         (*(xprt)->xp_ops->xp_destroy)(xprt)
 183
 184 #define SVC_CONTROL(xprt, rq, in)                       \
 185         (*(xprt)->xp_ops2->xp_control)((xprt), (rq), (in))
 186
 187 /*
 188  * Service registration
 189  *
 190  * svc_reg(xprt, prog, vers, dispatch, nconf)
 191  *      const SVCXPRT *xprt;
 192  *      const rpcprog_t prog;
 193  *      const rpcvers_t vers;
 194  *      const void (*dispatch)();
 195  *      const struct netconfig *nconf;
 196  */
 197
 198 __BEGIN_DECLS
 199 extern bool_t   svc_reg(SVCXPRT *, const rpcprog_t, const rpcvers_t,
 200                         void (*)(struct svc_req *, SVCXPRT *),
 201                         const struct netconfig *);
 202 __END_DECLS
 203
 204 /*
 205  * Service un-registration
 206  *
 207  * svc_unreg(prog, vers)
 208  *      const rpcprog_t prog;
 209  *      const rpcvers_t vers;
 210  */
 211
 212 __BEGIN_DECLS
 213 extern void     svc_unreg(const rpcprog_t, const rpcvers_t);
 214 __END_DECLS
 215
 216 /*
 217  * Transport registration.
 218  *
 219  * xprt_register(xprt)
 220  *      SVCXPRT *xprt;
 221  */
 222 __BEGIN_DECLS
 223 extern void     xprt_register(SVCXPRT *);
 224 __END_DECLS
 225
 226 /*
 227  * Transport un-register
 228  *
 229  * xprt_unregister(xprt)
 230  *      SVCXPRT *xprt;
 231  */
 232 __BEGIN_DECLS
 233 extern void     xprt_unregister(SVCXPRT *);
 234 __END_DECLS
 235
 236
 237 /*
 238  * When the service routine is called, it must first check to see if it
 239  * knows about the procedure;  if not, it should call svcerr_noproc
 240  * and return.  If so, it should deserialize its arguments via
 241  * SVC_GETARGS (defined above).  If the deserialization does not work,
 242  * svcerr_decode should be called followed by a return.  Successful
 243  * decoding of the arguments should be followed the execution of the
 244  * procedure's code and a call to svc_sendreply.
 245  *
 246  * Also, if the service refuses to execute the procedure due to too-
 247  * weak authentication parameters, svcerr_weakauth should be called.
 248  * Note: do not confuse access-control failure with weak authentication!
 249  *
 250  * NB: In pure implementations of rpc, the caller always waits for a reply
 251  * msg.  This message is sent when svc_sendreply is called.
 252  * Therefore pure service implementations should always call
 253  * svc_sendreply even if the function logically returns void;  use
 254  * xdr.h - xdr_void for the xdr routine.  HOWEVER, tcp based rpc allows
 255  * for the abuse of pure rpc via batched calling or pipelining.  In the
 256  * case of a batched call, svc_sendreply should NOT be called since
 257  * this would send a return message, which is what batching tries to avoid.
 258  * It is the service/protocol writer's responsibility to know which calls are
 259  * batched and which are not.  Warning: responding to batch calls may
 260  * deadlock the caller and server processes!
 261  */
 262
 263 __BEGIN_DECLS
 264 extern bool_t   svc_sendreply(SVCXPRT *, xdrproc_t, void *);
 265 extern void     svcerr_decode(SVCXPRT *);
 266 extern void     svcerr_weakauth(SVCXPRT *);
 267 extern void     svcerr_noproc(SVCXPRT *);
 268 extern void     svcerr_progvers(SVCXPRT *, rpcvers_t, rpcvers_t);
 269 extern void     svcerr_auth(SVCXPRT *, enum auth_stat);
 270 extern void     svcerr_noprog(SVCXPRT *);
 271 extern void     svcerr_systemerr(SVCXPRT *);
 272 extern int      rpc_reg(rpcprog_t, rpcvers_t, rpcproc_t,
 273                         char *(*)(char *), xdrproc_t, xdrproc_t,
 274                         char *);
 275 __END_DECLS
 276
 277 /*
 278  * Lowest level dispatching -OR- who owns this process anyway.
 279  * Somebody has to wait for incoming requests and then call the correct
 280  * service routine.  The routine svc_run does infinite waiting; i.e.,
 281  * svc_run never returns.
 282  * Since another (co-existant) package may wish to selectively wait for
 283  * incoming calls or other events outside of the rpc architecture, the
 284  * routine svc_getreq is provided.  It must be passed readfds, the
 285  * "in-place" results of a select system call (see select, section 2).
 286  */
 287
 288 /*
 289  * Global keeper of rpc service descriptors in use
 290  * dynamic; must be inspected before each call to select
 291  */
 292 extern int svc_maxfd;
 293 #ifdef FD_SETSIZE
 294 extern fd_set svc_fdset;
 295 #define svc_fds svc_fdset.fds_bits[0]   /* compatibility */
 296 #else
 297 extern int svc_fds;
 298 #endif /* def FD_SETSIZE */
 299
 300 /*
 301  * a small program implemented by the svc_rpc implementation itself;
 302  * also see clnt.h for protocol numbers.
 303  */
 304 __BEGIN_DECLS
 305 extern void rpctest_service(void);
 306 __END_DECLS
 307
 308 __BEGIN_DECLS
 309 extern void     svc_getreq(int);
 310 extern void     svc_getreqset(fd_set *);
 311 extern void     svc_getreq_common(int);
 312 struct pollfd;
 313 extern void     svc_getreq_poll(struct pollfd *, int);
 314
 315 extern void     svc_run(void);
 316 extern void     svc_exit(void);
 317 __END_DECLS
 318
 319 /*
 320  * Socket to use on svcxxx_create call to get default socket
 321  */
 322 #define RPC_ANYSOCK     -1
 323 #define RPC_ANYFD       RPC_ANYSOCK
 324
 325 /*
 326  * These are the existing service side transport implementations
 327  */
 328
 329 __BEGIN_DECLS
 330 /*
 331  * Transport independent svc_create routine.
 332  */
 333 extern int svc_create(void (*)(struct svc_req *, SVCXPRT *),
 334                            const rpcprog_t, const rpcvers_t, const char *);
 335 /*
 336  *      void (*dispatch)();             -- dispatch routine
 337  *      const rpcprog_t prognum;        -- program number
 338  *      const rpcvers_t versnum;        -- version number
 339  *      const char *nettype;            -- network type
 340  */
 341
 342
 343 /*
 344  * Generic server creation routine. It takes a netconfig structure
 345  * instead of a nettype.
 346  */
 347
 348 extern SVCXPRT *svc_tp_create(void (*)(struct svc_req *, SVCXPRT *),
 349                                    const rpcprog_t, const rpcvers_t,
 350                                    const struct netconfig *);
 351         /*
 352          * void (*dispatch)();            -- dispatch routine
 353          * const rpcprog_t prognum;       -- program number
 354          * const rpcvers_t versnum;       -- version number
 355          * const struct netconfig *nconf; -- netconfig structure
 356          */
 357
 358
 359 /*
 360  * Generic TLI create routine
 361  */
 362 extern SVCXPRT *svc_tli_create(const int, const struct netconfig *,
 363                                const struct t_bind *, const u_int,
 364                                const u_int);
 365 /*
 366  *      const int fd;                   -- connection end point
 367  *      const struct netconfig *nconf;  -- netconfig structure for network
 368  *      const struct t_bind *bindaddr;  -- local bind address
 369  *      const u_int sendsz;             -- max sendsize
 370  *      const u_int recvsz;             -- max recvsize
 371  */
 372
 373 /*
 374  * Connectionless and connectionful create routines
 375  */
 376
 377 extern SVCXPRT *svc_vc_create(const int, const u_int, const u_int);
 378 /*
 379  *      const int fd;                           -- open connection end point
 380  *      const u_int sendsize;                   -- max send size
 381  *      const u_int recvsize;                   -- max recv size
 382  */
 383
 384 /*
 385  * Added for compatibility to old rpc 4.0. Obsoleted by svc_vc_create().
 386  */
 387 extern SVCXPRT *svcunix_create(int, u_int, u_int, char *);
 388
 389 extern SVCXPRT *svc_dg_create(const int, const u_int, const u_int);
 390         /*
 391          * const int fd;                                -- open connection
 392          * const u_int sendsize;                        -- max send size
 393          * const u_int recvsize;                        -- max recv size
 394          */
 395
 396
 397 /*
 398  * the routine takes any *open* connection
 399  * descriptor as its first input and is used for open connections.
 400  */
 401 extern SVCXPRT *svc_fd_create(const int, const u_int, const u_int);
 402 /*
 403  *      const int fd;                           -- open connection end point
 404  *      const u_int sendsize;                   -- max send size
 405  *      const u_int recvsize;                   -- max recv size
 406  */
 407
 408 /*
 409  * Added for compatibility to old rpc 4.0. Obsoleted by svc_fd_create().
 410  */
 411 extern SVCXPRT *svcunixfd_create(int, u_int, u_int);
 412
 413 /*
 414  * Memory based rpc (for speed check and testing)
 415  */
 416 extern SVCXPRT *svc_raw_create(void);
 417
 418 /*
 419  * svc_dg_enable_cache() enables the cache on dg transports.
 420  */
 421 int svc_dg_enablecache(SVCXPRT *, const u_int);
 422
 423 int __rpc_get_local_uid(SVCXPRT *_transp, uid_t *_uid);
 424
 425 __END_DECLS
 426
 427
 428 /* for backward compatibility */
 429 #include <rpc/svc_soc.h>
 430
 431 #endif /* !_RPC_SVC_H */