include/rpc/clnt.h

   1 /*-
   2  * Copyright (c) 2010, Oracle America, 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 the "Oracle America, 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: @(#)clnt.h 1.31 94/04/29 SMI
  29  *      from: @(#)clnt.h        2.1 88/07/29 4.0 RPCSRC
  30  * $NetBSD: clnt.h,v 1.14 2000/06/02 22:57:55 fvdl Exp $
  31  * $FreeBSD: head/include/rpc/clnt.h 258581 2013-11-25 19:08:38Z hrs $
  32  */
  33
  34 /*
  35  * clnt.h - Client side remote procedure call interface.
  36  */
  37
  38 #ifndef _RPC_CLNT_H_
  39 #define _RPC_CLNT_H_
  40 #include <rpc/clnt_stat.h>
  41 #include <sys/cdefs.h>
  42 #include <netconfig.h>
  43 #include <sys/un.h>
  44
  45 /*
  46  * Well-known IPV6 RPC broadcast address.
  47  */
  48 #define RPCB_MULTICAST_ADDR "ff02::202"
  49
  50 /*
  51  * the following errors are in general unrecoverable.  The caller
  52  * should give up rather than retry.
  53  */
  54 #define IS_UNRECOVERABLE_RPC(s) (((s) == RPC_AUTHERROR) || \
  55         ((s) == RPC_CANTENCODEARGS) || \
  56         ((s) == RPC_CANTDECODERES) || \
  57         ((s) == RPC_VERSMISMATCH) || \
  58         ((s) == RPC_PROCUNAVAIL) || \
  59         ((s) == RPC_PROGUNAVAIL) || \
  60         ((s) == RPC_PROGVERSMISMATCH) || \
  61         ((s) == RPC_CANTDECODEARGS))
  62
  63 /*
  64  * Error info.
  65  */
  66 struct rpc_err {
  67         enum clnt_stat re_status;
  68         union {
  69                 int RE_errno;           /* related system error */
  70                 enum auth_stat RE_why;  /* why the auth error occurred */
  71                 struct {
  72                         rpcvers_t low;  /* lowest version supported */
  73                         rpcvers_t high; /* highest version supported */
  74                 } RE_vers;
  75                 struct {                /* maybe meaningful if RPC_FAILED */
  76                         int32_t s1;
  77                         int32_t s2;
  78                 } RE_lb;                /* life boot & debugging only */
  79         } ru;
  80 #define re_errno        ru.RE_errno
  81 #define re_why          ru.RE_why
  82 #define re_vers         ru.RE_vers
  83 #define re_lb           ru.RE_lb
  84 };
  85
  86
  87 /*
  88  * Client rpc handle.
  89  * Created by individual implementations
  90  * Client is responsible for initializing auth, see e.g. auth_none.c.
  91  */
  92 typedef struct __rpc_client {
  93         AUTH    *cl_auth;                       /* authenticator */
  94         struct clnt_ops {
  95                 /* call remote procedure */
  96                 enum clnt_stat  (*cl_call)(struct __rpc_client *,
  97                                     rpcproc_t, xdrproc_t, void *, xdrproc_t,
  98                                         void *, struct timeval);
  99                 /* abort a call */
 100                 void            (*cl_abort)(struct __rpc_client *);
 101                 /* get specific error code */
 102                 void            (*cl_geterr)(struct __rpc_client *,
 103                                         struct rpc_err *);
 104                 /* frees results */
 105                 bool_t          (*cl_freeres)(struct __rpc_client *,
 106                                         xdrproc_t, void *);
 107                 /* destroy this structure */
 108                 void            (*cl_destroy)(struct __rpc_client *);
 109                 /* the ioctl() of rpc */
 110                 bool_t          (*cl_control)(struct __rpc_client *, u_int,
 111                                     void *);
 112         } *cl_ops;
 113         void                    *cl_private;    /* private stuff */
 114         char                    *cl_netid;      /* network token */
 115         char                    *cl_tp;         /* device name */
 116 } CLIENT;
 117
 118
 119 /*
 120  * Timers used for the pseudo-transport protocol when using datagrams
 121  */
 122 struct rpc_timers {
 123         u_short         rt_srtt;        /* smoothed round-trip time */
 124         u_short         rt_deviate;     /* estimated deviation */
 125         u_long          rt_rtxcur;      /* current (backed-off) rto */
 126 };
 127
 128 /*
 129  * Feedback values used for possible congestion and rate control
 130  */
 131 #define FEEDBACK_REXMIT1        1       /* first retransmit */
 132 #define FEEDBACK_OK             2       /* no retransmits */
 133
 134 /* Used to set version of portmapper used in broadcast */
 135
 136 #define CLCR_SET_LOWVERS        3
 137 #define CLCR_GET_LOWVERS        4
 138
 139 #define RPCSMALLMSGSIZE 400     /* a more reasonable packet size */
 140
 141 /*
 142  * client side rpc interface ops
 143  *
 144  * Parameter types are:
 145  *
 146  */
 147
 148 /*
 149  * enum clnt_stat
 150  * CLNT_CALL(rh, proc, xargs, argsp, xres, resp, timeout)
 151  *      CLIENT *rh;
 152  *      rpcproc_t proc;
 153  *      xdrproc_t xargs;
 154  *      void *argsp;
 155  *      xdrproc_t xres;
 156  *      void *resp;
 157  *      struct timeval timeout;
 158  */
 159 #define CLNT_CALL(rh, proc, xargs, argsp, xres, resp, secs) \
 160         ((*(rh)->cl_ops->cl_call)(rh, proc, xargs, \
 161                 argsp, xres, resp, secs))
 162 #define clnt_call(rh, proc, xargs, argsp, xres, resp, secs) \
 163         ((*(rh)->cl_ops->cl_call)(rh, proc, xargs, \
 164                 argsp, xres, resp, secs))
 165
 166 /*
 167  * void
 168  * CLNT_ABORT(rh);
 169  *      CLIENT *rh;
 170  */
 171 #define CLNT_ABORT(rh)  ((*(rh)->cl_ops->cl_abort)(rh))
 172 #define clnt_abort(rh)  ((*(rh)->cl_ops->cl_abort)(rh))
 173
 174 /*
 175  * struct rpc_err
 176  * CLNT_GETERR(rh);
 177  *      CLIENT *rh;
 178  */
 179 #define CLNT_GETERR(rh,errp)    ((*(rh)->cl_ops->cl_geterr)(rh, errp))
 180 #define clnt_geterr(rh,errp)    ((*(rh)->cl_ops->cl_geterr)(rh, errp))
 181
 182
 183 /*
 184  * bool_t
 185  * CLNT_FREERES(rh, xres, resp);
 186  *      CLIENT *rh;
 187  *      xdrproc_t xres;
 188  *      void *resp;
 189  */
 190 #define CLNT_FREERES(rh,xres,resp) ((*(rh)->cl_ops->cl_freeres)(rh,xres,resp))
 191 #define clnt_freeres(rh,xres,resp) ((*(rh)->cl_ops->cl_freeres)(rh,xres,resp))
 192
 193 /*
 194  * bool_t
 195  * CLNT_CONTROL(cl, request, info)
 196  *      CLIENT *cl;
 197  *      u_int request;
 198  *      char *info;
 199  */
 200 #define CLNT_CONTROL(cl,rq,in) ((*(cl)->cl_ops->cl_control)(cl,rq,in))
 201 #define clnt_control(cl,rq,in) ((*(cl)->cl_ops->cl_control)(cl,rq,in))
 202
 203 /*
 204  * control operations that apply to both udp and tcp transports
 205  */
 206 #define CLSET_TIMEOUT           1       /* set timeout (timeval) */
 207 #define CLGET_TIMEOUT           2       /* get timeout (timeval) */
 208 #define CLGET_SERVER_ADDR       3       /* get server's address (sockaddr) */
 209 #define CLGET_FD                6       /* get connections file descriptor */
 210 #define CLGET_SVC_ADDR          7       /* get server's address (netbuf) */
 211 #define CLSET_FD_CLOSE          8       /* close fd while clnt_destroy */
 212 #define CLSET_FD_NCLOSE         9       /* Do not close fd while clnt_destroy */
 213 #define CLGET_XID               10      /* Get xid */
 214 #define CLSET_XID               11      /* Set xid */
 215 #define CLGET_VERS              12      /* Get version number */
 216 #define CLSET_VERS              13      /* Set version number */
 217 #define CLGET_PROG              14      /* Get program number */
 218 #define CLSET_PROG              15      /* Set program number */
 219 #define CLSET_SVC_ADDR          16      /* get server's address (netbuf) */
 220 #define CLSET_PUSH_TIMOD        17      /* push timod if not already present */
 221 #define CLSET_POP_TIMOD         18      /* pop timod */
 222 /*
 223  * Connectionless only control operations
 224  */
 225 #define CLSET_RETRY_TIMEOUT 4   /* set retry timeout (timeval) */
 226 #define CLGET_RETRY_TIMEOUT 5   /* get retry timeout (timeval) */
 227 #define CLSET_ASYNC             19
 228 #define CLSET_CONNECT           20      /* Use connect() for UDP. (int) */
 229
 230 /*
 231  * void
 232  * CLNT_DESTROY(rh);
 233  *      CLIENT *rh;
 234  */
 235 #define CLNT_DESTROY(rh)        ((*(rh)->cl_ops->cl_destroy)(rh))
 236 #define clnt_destroy(rh)        ((*(rh)->cl_ops->cl_destroy)(rh))
 237
 238
 239 /*
 240  * RPCTEST is a test program which is accessible on every rpc
 241  * transport/port.  It is used for testing, performance evaluation,
 242  * and network administration.
 243  */
 244
 245 #define RPCTEST_PROGRAM         ((rpcprog_t)1)
 246 #define RPCTEST_VERSION         ((rpcvers_t)1)
 247 #define RPCTEST_NULL_PROC       ((rpcproc_t)2)
 248 #define RPCTEST_NULL_BATCH_PROC ((rpcproc_t)3)
 249
 250 /*
 251  * By convention, procedure 0 takes null arguments and returns them
 252  */
 253
 254 #define NULLPROC ((rpcproc_t)0)
 255
 256 /*
 257  * Below are the client handle creation routines for the various
 258  * implementations of client side rpc.  They can return NULL if a
 259  * creation failure occurs.
 260  */
 261
 262 /*
 263  * Generic client creation routine. Supported protocols are those that
 264  * belong to the nettype namespace (/etc/netconfig).
 265  */
 266 __BEGIN_DECLS
 267 extern CLIENT *clnt_create(const char *, const rpcprog_t, const rpcvers_t,
 268                            const char *);
 269 /*
 270  *
 271  *      const char *hostname;                   -- hostname
 272  *      const rpcprog_t prog;                   -- program number
 273  *      const rpcvers_t vers;                   -- version number
 274  *      const char *nettype;                    -- network type
 275  */
 276
 277  /*
 278  * Generic client creation routine. Just like clnt_create(), except
 279  * it takes an additional timeout parameter.
 280  */
 281 extern CLIENT * clnt_create_timed(const char *, const rpcprog_t,
 282         const rpcvers_t, const char *, const struct timeval *);
 283 /*
 284  *
 285  *      const char *hostname;                   -- hostname
 286  *      const rpcprog_t prog;                   -- program number
 287  *      const rpcvers_t vers;                   -- version number
 288  *      const char *nettype;                    -- network type
 289  *      const struct timeval *tp;               -- timeout
 290  */
 291
 292 /*
 293  * Generic client creation routine. Supported protocols are which belong
 294  * to the nettype name space.
 295  */
 296 extern CLIENT *clnt_create_vers(const char *, const rpcprog_t, rpcvers_t *,
 297                                 const rpcvers_t, const rpcvers_t,
 298                                 const char *);
 299 /*
 300  *      const char *host;               -- hostname
 301  *      const rpcprog_t prog;           -- program number
 302  *      rpcvers_t *vers_out;            -- servers highest available version
 303  *      const rpcvers_t vers_low;       -- low version number
 304  *      const rpcvers_t vers_high;      -- high version number
 305  *      const char *nettype;            -- network type
 306  */
 307
 308 /*
 309  * Generic client creation routine. Supported protocols are which belong
 310  * to the nettype name space.
 311  */
 312 extern CLIENT * clnt_create_vers_timed(const char *, const rpcprog_t,
 313         rpcvers_t *, const rpcvers_t, const rpcvers_t, const char *,
 314         const struct timeval *);
 315 /*
 316  *      const char *host;               -- hostname
 317  *      const rpcprog_t prog;           -- program number
 318  *      rpcvers_t *vers_out;            -- servers highest available version
 319  *      const rpcvers_t vers_low;       -- low version number
 320  *      const rpcvers_t vers_high;      -- high version number
 321  *      const char *nettype;            -- network type
 322  *      const struct timeval *tp        -- timeout
 323  */
 324
 325 /*
 326  * Generic client creation routine. It takes a netconfig structure
 327  * instead of nettype
 328  */
 329 extern CLIENT *clnt_tp_create(const char *, const rpcprog_t,
 330                               const rpcvers_t, const struct netconfig *);
 331 /*
 332  *      const char *hostname;                   -- hostname
 333  *      const rpcprog_t prog;                   -- program number
 334  *      const rpcvers_t vers;                   -- version number
 335  *      const struct netconfig *netconf;        -- network config structure
 336  */
 337
 338 /*
 339  * Generic client creation routine. Just like clnt_tp_create(), except
 340  * it takes an additional timeout parameter.
 341  */
 342 extern CLIENT * clnt_tp_create_timed(const char *, const rpcprog_t,
 343         const rpcvers_t, const struct netconfig *, const struct timeval *);
 344 /*
 345  *      const char *hostname;                   -- hostname
 346  *      const rpcprog_t prog;                   -- program number
 347  *      const rpcvers_t vers;                   -- version number
 348  *      const struct netconfig *netconf;        -- network config structure
 349  *      const struct timeval *tp                -- timeout
 350  */
 351
 352 /*
 353  * Generic TLI create routine. Only provided for compatibility.
 354  */
 355
 356 extern CLIENT *clnt_tli_create(const int, const struct netconfig *,
 357                                struct netbuf *, const rpcprog_t,
 358                                const rpcvers_t, const u_int, const u_int);
 359 /*
 360  *      const register int fd;          -- fd
 361  *      const struct netconfig *nconf;  -- netconfig structure
 362  *      struct netbuf *svcaddr;         -- servers address
 363  *      const u_long prog;                      -- program number
 364  *      const u_long vers;                      -- version number
 365  *      const u_int sendsz;                     -- send size
 366  *      const u_int recvsz;                     -- recv size
 367  */
 368
 369 /*
 370  * Low level clnt create routine for connectionful transports, e.g. tcp.
 371  */
 372 extern CLIENT *clnt_vc_create(const int, const struct netbuf *,
 373                               const rpcprog_t, const rpcvers_t,
 374                               u_int, u_int);
 375 /*
 376  * Added for compatibility to old rpc 4.0. Obsoleted by clnt_vc_create().
 377  */
 378 extern CLIENT *clntunix_create(struct sockaddr_un *,
 379                                u_long, u_long, int *, u_int, u_int);
 380 /*
 381  *      const int fd;                           -- open file descriptor
 382  *      const struct netbuf *svcaddr;           -- servers address
 383  *      const rpcprog_t prog;                   -- program number
 384  *      const rpcvers_t vers;                   -- version number
 385  *      const u_int sendsz;                     -- buffer recv size
 386  *      const u_int recvsz;                     -- buffer send size
 387  */
 388
 389 /*
 390  * Low level clnt create routine for connectionless transports, e.g. udp.
 391  */
 392 extern CLIENT *clnt_dg_create(const int, const struct netbuf *,
 393                               const rpcprog_t, const rpcvers_t,
 394                               const u_int, const u_int);
 395 /*
 396  *      const int fd;                           -- open file descriptor
 397  *      const struct netbuf *svcaddr;           -- servers address
 398  *      const rpcprog_t program;                -- program number
 399  *      const rpcvers_t version;                -- version number
 400  *      const u_int sendsz;                     -- buffer recv size
 401  *      const u_int recvsz;                     -- buffer send size
 402  */
 403
 404 /*
 405  * Memory based rpc (for speed check and testing)
 406  * CLIENT *
 407  * clnt_raw_create(prog, vers)
 408  *      u_long prog;
 409  *      u_long vers;
 410  */
 411 extern CLIENT *clnt_raw_create(rpcprog_t, rpcvers_t);
 412
 413 __END_DECLS
 414
 415
 416 /*
 417  * Print why creation failed
 418  */
 419 __BEGIN_DECLS
 420 extern void clnt_pcreateerror(const char *);                    /* stderr */
 421 extern char *clnt_spcreateerror(const char *);                  /* string */
 422 __END_DECLS
 423
 424 /*
 425  * Like clnt_perror(), but is more verbose in its output
 426  */
 427 __BEGIN_DECLS
 428 extern void clnt_perrno(enum clnt_stat);                /* stderr */
 429 extern char *clnt_sperrno(enum clnt_stat);              /* string */
 430 __END_DECLS
 431
 432 /*
 433  * Print an English error message, given the client error code
 434  */
 435 __BEGIN_DECLS
 436 extern void clnt_perror(CLIENT *, const char *);                /* stderr */
 437 extern char *clnt_sperror(CLIENT *, const char *);              /* string */
 438 __END_DECLS
 439
 440
 441 /*
 442  * If a creation fails, the following allows the user to figure out why.
 443  */
 444 struct rpc_createerr {
 445         enum clnt_stat cf_stat;
 446         struct rpc_err cf_error; /* useful when cf_stat == RPC_PMAPFAILURE */
 447 };
 448
 449 __BEGIN_DECLS
 450 extern struct rpc_createerr     *__rpc_createerr(void);
 451 __END_DECLS
 452 #define rpc_createerr           (*(__rpc_createerr()))
 453
 454 /*
 455  * The simplified interface:
 456  * enum clnt_stat
 457  * rpc_call(host, prognum, versnum, procnum, inproc, in, outproc, out, nettype)
 458  *      const char *host;
 459  *      const rpcprog_t prognum;
 460  *      const rpcvers_t versnum;
 461  *      const rpcproc_t procnum;
 462  *      const xdrproc_t inproc, outproc;
 463  *      const char *in;
 464  *      char *out;
 465  *      const char *nettype;
 466  */
 467 __BEGIN_DECLS
 468 extern enum clnt_stat rpc_call(const char *, const rpcprog_t,
 469                                const rpcvers_t, const rpcproc_t,
 470                                const xdrproc_t, const char *,
 471                                const xdrproc_t, char *, const char *);
 472 __END_DECLS
 473
 474 /*
 475  * RPC broadcast interface
 476  * The call is broadcasted to all locally connected nets.
 477  *
 478  * extern enum clnt_stat
 479  * rpc_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp,
 480  *                      eachresult, nettype)
 481  *      const rpcprog_t         prog;           -- program number
 482  *      const rpcvers_t         vers;           -- version number
 483  *      const rpcproc_t         proc;           -- procedure number
 484  *      const xdrproc_t xargs;          -- xdr routine for args
 485  *      caddr_t         argsp;          -- pointer to args
 486  *      const xdrproc_t xresults;       -- xdr routine for results
 487  *      caddr_t         resultsp;       -- pointer to results
 488  *      const resultproc_t      eachresult;     -- call with each result
 489  *      const char              *nettype;       -- Transport type
 490  *
 491  * For each valid response received, the procedure eachresult is called.
 492  * Its form is:
 493  *              done = eachresult(resp, raddr, nconf)
 494  *                      bool_t done;
 495  *                      caddr_t resp;
 496  *                      struct netbuf *raddr;
 497  *                      struct netconfig *nconf;
 498  * where resp points to the results of the call and raddr is the
 499  * address if the responder to the broadcast.  nconf is the transport
 500  * on which the response was received.
 501  *
 502  * extern enum clnt_stat
 503  * rpc_broadcast_exp(prog, vers, proc, xargs, argsp, xresults, resultsp,
 504  *                      eachresult, inittime, waittime, nettype)
 505  *      const rpcprog_t         prog;           -- program number
 506  *      const rpcvers_t         vers;           -- version number
 507  *      const rpcproc_t         proc;           -- procedure number
 508  *      const xdrproc_t xargs;          -- xdr routine for args
 509  *      caddr_t         argsp;          -- pointer to args
 510  *      const xdrproc_t xresults;       -- xdr routine for results
 511  *      caddr_t         resultsp;       -- pointer to results
 512  *      const resultproc_t      eachresult;     -- call with each result
 513  *      const int               inittime;       -- how long to wait initially
 514  *      const int               waittime;       -- maximum time to wait
 515  *      const char              *nettype;       -- Transport type
 516  */
 517
 518 typedef bool_t (*resultproc_t)(caddr_t, ...);
 519
 520 __BEGIN_DECLS
 521 extern enum clnt_stat rpc_broadcast(const rpcprog_t, const rpcvers_t,
 522                                     const rpcproc_t, const xdrproc_t,
 523                                     caddr_t, const xdrproc_t, caddr_t,
 524                                     const resultproc_t, const char *);
 525 extern enum clnt_stat rpc_broadcast_exp(const rpcprog_t, const rpcvers_t,
 526                                         const rpcproc_t, const xdrproc_t,
 527                                         caddr_t, const xdrproc_t, caddr_t,
 528                                         const resultproc_t, const int,
 529                                         const int, const char *);
 530 __END_DECLS
 531
 532 /* For backward compatibility */
 533 #include <rpc/clnt_soc.h>
 534
 535 #endif /* !_RPC_CLNT_H_ */