include/rpc/svc.h

   1 /*      $NetBSD: svc.h,v 1.22 2005/12/03 15:16:19 yamt Exp $    */
   2
   3 /*
   4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   5  * unrestricted use provided that this legend is included on all tape
   6  * media and as a part of the software program in whole or part.  Users
   7  * may copy or modify Sun RPC without charge, but are not authorized
   8  * to license or distribute it to anyone else except as part of a product or
   9  * program developed by the user.
  10  *
  11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  14  *
  15  * Sun RPC is provided with no support and without any obligation on the
  16  * part of Sun Microsystems, Inc. to assist in its use, correction,
  17  * modification or enhancement.
  18  *
  19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  21  * OR ANY PART THEREOF.
  22  *
  23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  24  * or profits or other special, indirect and consequential damages, even if
  25  * Sun has been advised of the possibility of such damages.
  26  *
  27  * Sun Microsystems, Inc.
  28  * 2550 Garcia Avenue
  29  * Mountain View, California  94043
  30  *
  31  *      from: @(#)svc.h 1.35 88/12/17 SMI
  32  *      @(#)svc.h      1.27    94/04/25 SMI
  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
  45 #include <rpc/rpc_com.h>
  46
  47 /*
  48  * This interface must manage two items concerning remote procedure calling:
  49  *
  50  * 1) An arbitrary number of transport connections upon which rpc requests
  51  * are received.  The two most notable transports are TCP and UDP;  they are
  52  * created and registered by routines in svc_tcp.c and svc_udp.c, respectively;
  53  * they in turn call xprt_register and xprt_unregister.
  54  *
  55  * 2) An arbitrary number of locally registered services.  Services are
  56  * described by the following four data: program number, version number,
  57  * "service dispatch" function, a transport handle, and a boolean that
  58  * indicates whether or not the exported program should be registered with a
  59  * local binder service;  if true the program's number and version and the
  60  * port number from the transport handle are registered with the binder.
  61  * These data are registered with the rpc svc system via svc_register.
  62  *
  63  * A service's dispatch function is called whenever an rpc request comes in
  64  * on a transport.  The request's program and version numbers must match
  65  * those of the registered service.  The dispatch function is passed two
  66  * parameters, struct svc_req * and SVCXPRT *, defined below.
  67  */
  68
  69 /*
  70  *      Service control requests
  71  */
  72 #define SVCGET_VERSQUIET        1
  73 #define SVCSET_VERSQUIET        2
  74 #define SVCGET_CONNMAXREC       3
  75 #define SVCSET_CONNMAXREC       4
  76
  77
  78 enum xprt_stat {
  79         XPRT_DIED,
  80         XPRT_MOREREQS,
  81         XPRT_IDLE
  82 };
  83
  84 /*
  85  * Server side transport handle
  86  */
  87 typedef struct __rpc_svcxprt {
  88         int             xp_fd;
  89         u_short         xp_port;         /* associated port number */
  90         const struct xp_ops {
  91                 /* receive incomming requests */
  92                 bool_t  (*xp_recv)(struct __rpc_svcxprt *, struct rpc_msg *);
  93                 /* get transport status */
  94                 enum xprt_stat (*xp_stat)(struct __rpc_svcxprt *);
  95                 /* get arguments */
  96                 bool_t  (*xp_getargs)(struct __rpc_svcxprt *, xdrproc_t,
  97                             caddr_t);
  98                 /* send reply */
  99                 bool_t  (*xp_reply)(struct __rpc_svcxprt *, struct rpc_msg *);
 100                 /* free mem allocated for args */
 101                 bool_t  (*xp_freeargs)(struct __rpc_svcxprt *, xdrproc_t,
 102                             caddr_t);
 103                 /* destroy this struct */
 104                 void    (*xp_destroy)(struct __rpc_svcxprt *);
 105         } *xp_ops;
 106         int             xp_addrlen;      /* length of remote address */
 107         struct sockaddr_in xp_raddr;     /* rem. addr. (backward ABI compat) */
 108         /* XXX - fvdl stick this here for ABI backward compat reasons */
 109         const struct xp_ops2 {
 110                 /* catch-all function */
 111                 bool_t  (*xp_control)(struct __rpc_svcxprt *, const u_int,
 112                                            void *);
 113         } *xp_ops2;
 114         char            *xp_tp;          /* transport provider device name */
 115         char            *xp_netid;       /* network token */
 116         struct netbuf   xp_ltaddr;       /* local transport address */
 117         struct netbuf   xp_rtaddr;       /* remote transport address */
 118         struct opaque_auth xp_verf;      /* raw response verifier */
 119         void            *xp_p1;          /* private: for use by svc ops */
 120         void            *xp_p2;          /* private: for use by svc ops */
 121         void            *xp_p3;          /* private: for use by svc lib */
 122         int             xp_type;         /* transport type */
 123 } SVCXPRT;
 124
 125 /*
 126  * Service request
 127  */
 128 struct svc_req {
 129         uint32_t        rq_prog;        /* service program number */
 130         uint32_t        rq_vers;        /* service protocol version */
 131         uint32_t        rq_proc;        /* the desired procedure */
 132         struct opaque_auth rq_cred;     /* raw creds from the wire */
 133         void            *rq_clntcred;   /* read only cooked cred */
 134         SVCXPRT         *rq_xprt;       /* associated transport */
 135 };
 136
 137 /*
 138  * Approved way of getting address of caller
 139  */
 140 #define svc_getrpccaller(x) (&(x)->xp_rtaddr)
 141
 142 /*
 143  * NetBSD-only definition to get the creds of the caller (AF_LOCAL).
 144  */
 145 #define __svc_getcallercreds(x) ((struct sockcred *)(x)->xp_p2)
 146
 147 /*
 148  * Operations defined on an SVCXPRT handle
 149  *
 150  * SVCXPRT              *xprt;
 151  * struct rpc_msg       *msg;
 152  * xdrproc_t             xargs;
 153  * caddr_t               argsp;
 154  */
 155 #define SVC_RECV(xprt, msg)                             \
 156         (*(xprt)->xp_ops->xp_recv)((xprt), (msg))
 157 #define svc_recv(xprt, msg)                             \
 158         (*(xprt)->xp_ops->xp_recv)((xprt), (msg))
 159
 160 #define SVC_STAT(xprt)                                  \
 161         (*(xprt)->xp_ops->xp_stat)(xprt)
 162 #define svc_stat(xprt)                                  \
 163         (*(xprt)->xp_ops->xp_stat)(xprt)
 164
 165 #define SVC_GETARGS(xprt, xargs, argsp)                 \
 166         (*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
 167 #define svc_getargs(xprt, xargs, argsp)                 \
 168         (*(xprt)->xp_ops->xp_getargs)((xprt), (xargs), (argsp))
 169
 170 #define SVC_REPLY(xprt, msg)                            \
 171         (*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
 172 #define svc_reply(xprt, msg)                            \
 173         (*(xprt)->xp_ops->xp_reply) ((xprt), (msg))
 174
 175 #define SVC_FREEARGS(xprt, xargs, argsp)                \
 176         (*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
 177 #define svc_freeargs(xprt, xargs, argsp)                \
 178         (*(xprt)->xp_ops->xp_freeargs)((xprt), (xargs), (argsp))
 179
 180 #define SVC_DESTROY(xprt)                               \
 181         (*(xprt)->xp_ops->xp_destroy)(xprt)
 182 #define svc_destroy(xprt)                               \
 183         (*(xprt)->xp_ops->xp_destroy)(xprt)
 184
 185 #define SVC_CONTROL(xprt, rq, in)                       \
 186         (*(xprt)->xp_ops2->xp_control)((xprt), (rq), (in))
 187
 188 /*
 189  * Service registration
 190  *
 191  * svc_reg(xprt, prog, vers, dispatch, nconf)
 192  *      const SVCXPRT *xprt;
 193  *      const rpcprog_t prog;
 194  *      const rpcvers_t vers;
 195  *      const void (*dispatch)(...);
 196  *      const struct netconfig *nconf;
 197  */
 198
 199 __BEGIN_DECLS
 200 extern bool_t   svc_reg(SVCXPRT *, const rpcprog_t, const rpcvers_t,
 201                         void (*)(struct svc_req *, SVCXPRT *),
 202                         const struct netconfig *);
 203 __END_DECLS
 204
 205 /*
 206  * Service un-registration
 207  *
 208  * svc_unreg(prog, vers)
 209  *      const rpcprog_t prog;
 210  *      const rpcvers_t vers;
 211  */
 212
 213 __BEGIN_DECLS
 214 extern void     svc_unreg(const rpcprog_t, const rpcvers_t);
 215 __END_DECLS
 216
 217 /*
 218  * Transport registration.
 219  *
 220  * xprt_register(xprt)
 221  *      SVCXPRT *xprt;
 222  */
 223 __BEGIN_DECLS
 224 extern void     xprt_register   (SVCXPRT *);
 225 __END_DECLS
 226
 227 /*
 228  * Transport un-register
 229  *
 230  * xprt_unregister(xprt)
 231  *      SVCXPRT *xprt;
 232  */
 233 __BEGIN_DECLS
 234 extern void     xprt_unregister (SVCXPRT *);
 235 __END_DECLS
 236
 237
 238 /*
 239  * When the service routine is called, it must first check to see if it
 240  * knows about the procedure;  if not, it should call svcerr_noproc
 241  * and return.  If so, it should deserialize its arguments via
 242  * SVC_GETARGS (defined above).  If the deserialization does not work,
 243  * svcerr_decode should be called followed by a return.  Successful
 244  * decoding of the arguments should be followed the execution of the
 245  * procedure's code and a call to svc_sendreply.
 246  *
 247  * Also, if the service refuses to execute the procedure due to too-
 248  * weak authentication parameters, svcerr_weakauth should be called.
 249  * Note: do not confuse access-control failure with weak authentication!
 250  *
 251  * NB: In pure implementations of rpc, the caller always waits for a reply
 252  * msg.  This message is sent when svc_sendreply is called.
 253  * Therefore pure service implementations should always call
 254  * svc_sendreply even if the function logically returns void;  use
 255  * xdr.h - xdr_void for the xdr routine.  HOWEVER, tcp based rpc allows
 256  * for the abuse of pure rpc via batched calling or pipelining.  In the
 257  * case of a batched call, svc_sendreply should NOT be called since
 258  * this would send a return message, which is what batching tries to avoid.
 259  * It is the service/protocol writer's responsibility to know which calls are
 260  * batched and which are not.  Warning: responding to batch calls may
 261  * deadlock the caller and server processes!
 262  */
 263
 264 __BEGIN_DECLS
 265 extern bool_t   svc_sendreply   (SVCXPRT *, xdrproc_t, const char *);
 266 extern void     svcerr_decode   (SVCXPRT *);
 267 extern void     svcerr_weakauth (SVCXPRT *);
 268 extern void     svcerr_noproc   (SVCXPRT *);
 269 extern void     svcerr_progvers (SVCXPRT *, rpcvers_t, rpcvers_t);
 270 extern void     svcerr_auth     (SVCXPRT *, enum auth_stat);
 271 extern void     svcerr_noprog   (SVCXPRT *);
 272 extern void     svcerr_systemerr(SVCXPRT *);
 273 extern int      rpc_reg(rpcprog_t, rpcvers_t, rpcproc_t,
 274                              char *(*)(char *), xdrproc_t, xdrproc_t,
 275                              char *);
 276 __END_DECLS
 277
 278 /*
 279  * Lowest level dispatching -OR- who owns this process anyway.
 280  * Somebody has to wait for incoming requests and then call the correct
 281  * service routine.  The routine svc_run does infinite waiting; i.e.,
 282  * svc_run never returns.
 283  * Since another (co-existent) package may wish to selectively wait for
 284  * incoming calls or other events outside of the rpc architecture, the
 285  * routine svc_getreq is provided.  It must be passed readfds, the
 286  * "in-place" results of a select system call (see select, section 2).
 287  */
 288
 289 /*
 290  * Global keeper of rpc service descriptors in use
 291  * dynamic; must be inspected before each call to select
 292  */
 293 extern int svc_maxfd;
 294 #ifdef FD_SETSIZE
 295 extern fd_set svc_fdset;
 296 #define svc_fds svc_fdset.fds_bits[0]   /* compatibility */
 297 #else
 298 extern int svc_fds;
 299 #endif /* def FD_SETSIZE */
 300
 301 /*
 302  * a small program implemented by the svc_rpc implementation itself;
 303  * also see clnt.h for protocol numbers.
 304  */
 305 __BEGIN_DECLS
 306 extern void rpctest_service(void);
 307 __END_DECLS
 308
 309 __BEGIN_DECLS
 310 extern void     svc_getreq      (int);
 311 extern void     svc_getreqset   (fd_set *);
 312 extern void     svc_getreq_common       (int);
 313 struct pollfd;
 314 extern void     svc_getreq_poll(struct pollfd *, int);
 315
 316 extern void     svc_run         (void);
 317 extern void     svc_exit        (void);
 318 __END_DECLS
 319
 320 /*
 321  * Socket to use on svcxxx_create call to get default socket
 322  */
 323 #define RPC_ANYSOCK     -1
 324 #define RPC_ANYFD       RPC_ANYSOCK
 325
 326 /*
 327  * These are the existing service side transport implementations
 328  */
 329
 330 __BEGIN_DECLS
 331 /*
 332  * Transport independent svc_create routine.
 333  */
 334 extern int svc_create(void (*)(struct svc_req *, SVCXPRT *),
 335                            const rpcprog_t, const rpcvers_t, const char *);
 336 /*
 337  *      void (*dispatch)(...);          -- dispatch routine
 338  *      const rpcprog_t prognum;        -- program number
 339  *      const rpcvers_t versnum;        -- version number
 340  *      const char *nettype;            -- network type
 341  */
 342
 343
 344 /*
 345  * Generic server creation routine. It takes a netconfig structure
 346  * instead of a nettype.
 347  */
 348
 349 extern SVCXPRT *svc_tp_create(void (*)(struct svc_req *, SVCXPRT *),
 350                                    const rpcprog_t, const rpcvers_t,
 351                                    const struct netconfig *);
 352 /*
 353  *      void (*dispatch)(...);          -- dispatch routine
 354  *      const rpcprog_t prognum;        -- program number
 355  *      const rpcvers_t versnum;        -- version number
 356  *      const struct netconfig *nconf;  -- netconfig structure
 357  */
 358
 359
 360 /*
 361  * Generic TLI create routine
 362  */
 363 extern SVCXPRT *svc_tli_create(const int, const struct netconfig *,
 364                                     const struct t_bind *, const u_int,
 365                                     const u_int);
 366 /*
 367  *      const int fd;                   -- connection end point
 368  *      const struct netconfig *nconf;  -- netconfig structure for network
 369  *      const struct t_bind *bindaddr;  -- local bind address
 370  *      const u_int sendsz;             -- max sendsize
 371  *      const u_int recvsz;             -- max recvsize
 372  */
 373
 374 /*
 375  * Connectionless and connectionful create routines
 376  */
 377
 378 extern SVCXPRT *svc_vc_create(const int, const u_int, const u_int);
 379 /*
 380  *      const int fd;                   -- open connection end point
 381  *      const u_int sendsize;           -- max send size
 382  *      const u_int recvsize;           -- max recv size
 383  */
 384
 385 extern SVCXPRT *svc_dg_create(const int, const u_int, const u_int);
 386 /*
 387  *      const int fd;                   -- open connection
 388  *      const u_int sendsize;           -- max send size
 389  *      const u_int recvsize;           -- max recv size
 390  */
 391
 392
 393 /*
 394  * the routine takes any *open* connection
 395  * descriptor as its first input and is used for open connections.
 396  */
 397 extern SVCXPRT *svc_fd_create(const int, const u_int, const u_int);
 398 /*
 399  *      const int fd;                   -- open connection end point
 400  *      const u_int sendsize;           -- max send size
 401  *      const u_int recvsize;           -- max recv size
 402  */
 403
 404 /*
 405  * Memory based rpc (for speed check and testing)
 406  */
 407 extern SVCXPRT *svc_raw_create(void);
 408
 409 /*
 410  * svc_dg_enable_cache() enables the cache on dg transports.
 411  */
 412 int svc_dg_enablecache(SVCXPRT *, const u_int);
 413
 414 __END_DECLS
 415
 416
 417 /* for backward compatibility */
 418 #include <rpc/svc_soc.h>
 419
 420 #endif /* !_RPC_SVC_H_ */