rpc.subproj/clnt_udp.c

   1 /*
   2  * Copyright (c) 1999-2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  26  * unrestricted use provided that this legend is included on all tape
  27  * media and as a part of the software program in whole or part.  Users
  28  * may copy or modify Sun RPC without charge, but are not authorized
  29  * to license or distribute it to anyone else except as part of a product or
  30  * program developed by the user.
  31  *
  32  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  33  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  34  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  35  *
  36  * Sun RPC is provided with no support and without any obligation on the
  37  * part of Sun Microsystems, Inc. to assist in its use, correction,
  38  * modification or enhancement.
  39  *
  40  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  41  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  42  * OR ANY PART THEREOF.
  43  *
  44  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  45  * or profits or other special, indirect and consequential damages, even if
  46  * Sun has been advised of the possibility of such damages.
  47  *
  48  * Sun Microsystems, Inc.
  49  * 2550 Garcia Avenue
  50  * Mountain View, California  94043
  51  */
  52
  53 #if defined(LIBC_SCCS) && !defined(lint)
  54 /*static char *sccsid = "from: @(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";*/
  55 /*static char *sccsid = "from: @(#)clnt_udp.c   2.2 88/08/01 4.0 RPCSRC";*/
  56 static char *rcsid = "$Id: clnt_udp.c,v 1.4 2002/03/15 22:07:49 majka Exp $";
  57 #endif
  58
  59 /*
  60  * clnt_udp.c, Implements a UDP/IP based, client side RPC.
  61  *
  62  * Copyright (C) 1984, Sun Microsystems, Inc.
  63  */
  64
  65 #include <stdio.h>
  66 #include <stdlib.h>
  67 #include <string.h>
  68 #include <unistd.h>
  69 #include <rpc/rpc.h>
  70 #include <sys/socket.h>
  71 #include <sys/fcntl.h>
  72 #include <sys/ioctl.h>
  73 #include <netdb.h>
  74 #include <errno.h>
  75 #include <rpc/pmap_clnt.h>
  76
  77 extern int      bindresvport();
  78 extern bool_t   xdr_opaque_auth();
  79
  80 extern u_short pmap_getport_timeout(struct sockaddr_in *address, uint32_t program, uint32_t version, uint32_t protocol, struct timeval *timeout, struct timeval *totaltimeout);
  81
  82 extern int errno;
  83
  84 /*
  85  * UDP bases client side rpc operations
  86  */
  87 static enum clnt_stat   clntudp_call();
  88 static void             clntudp_abort();
  89 static void             clntudp_geterr();
  90 static bool_t           clntudp_freeres();
  91 static bool_t           clntudp_control();
  92 static void             clntudp_destroy();
  93
  94 static struct clnt_ops udp_ops = {
  95         clntudp_call,
  96         clntudp_abort,
  97         clntudp_geterr,
  98         clntudp_freeres,
  99         clntudp_destroy,
 100         clntudp_control
 101 };
 102
 103 /*
 104  * Private data kept per client handle
 105  */
 106 struct cu_data {
 107         int                cu_sock;
 108         bool_t             cu_closeit;
 109         struct sockaddr_in cu_raddr;
 110         int                cu_rlen;
 111         struct timeval     cu_retry_timeout;
 112         struct timeval     cu_total_timeout;
 113         struct rpc_err     cu_error;
 114         XDR                cu_outxdrs;
 115         u_int              cu_xdrpos;
 116         u_int              cu_sendsz;
 117         char               *cu_outbuf;
 118         u_int              cu_recvsz;
 119         char               cu_inbuf[1];
 120 };
 121
 122 /*
 123  * Create a UDP based client handle.
 124  * If *sockp<0, *sockp is set to a newly created UPD socket.
 125  * If raddr->sin_port is 0 a binder on the remote machine
 126  * is consulted for the correct port number.
 127  * NB: It is the clients responsibility to close *sockp.
 128  * NB: The rpch->cl_auth is initialized to null authentication.
 129  *     Caller may wish to set this something more useful.
 130  *
 131  * wait is the amount of time used between retransmitting a call if
 132  * no response has been heard;  retransmition occurs until the actual
 133  * rpc call times out.
 134  *
 135  * sendsz and recvsz are the maximum allowable packet sizes that can be
 136  * sent and received.
 137  */
 138 CLIENT *
 139 clntudp_bufcreate_timeout(struct sockaddr_in *raddr, uint32_t program, uint32_t version, int *sockp, uint32_t sendsz, uint32_t recvsz, struct timeval *retry_timeout, struct timeval *total_timeout)
 140 {
 141         CLIENT *cl;
 142         struct cu_data *cu = NULL;
 143         struct timeval now;
 144         struct rpc_msg call_msg;
 145         int rfd;
 146         u_short port;
 147         socklen_t len;
 148         unsigned int rsize;
 149
 150         cl = (CLIENT *)mem_alloc(sizeof(CLIENT));
 151         if (cl == NULL)
 152         {
 153                 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 154                 rpc_createerr.cf_error.re_errno = errno;
 155                 goto fooy;
 156         }
 157
 158         sendsz = ((sendsz + 3) / 4) * 4;
 159         recvsz = ((recvsz + 3) / 4) * 4;
 160         cu = (struct cu_data *)mem_alloc(sizeof(*cu) + sendsz + recvsz);
 161         if (cu == NULL)
 162         {
 163                 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 164                 rpc_createerr.cf_error.re_errno = errno;
 165                 goto fooy;
 166         }
 167
 168         cu->cu_outbuf = &cu->cu_inbuf[recvsz];
 169
 170         if (raddr->sin_port == 0)
 171         {
 172                 port = pmap_getport_timeout(raddr, program, version, IPPROTO_UDP, retry_timeout, total_timeout);
 173                 if (port == 0) goto fooy;
 174
 175                 raddr->sin_port = htons(port);
 176         }
 177
 178         cl->cl_ops = &udp_ops;
 179         cl->cl_private = (caddr_t)cu;
 180         cu->cu_raddr = *raddr;
 181         cu->cu_rlen = sizeof (cu->cu_raddr);
 182         cu->cu_sendsz = sendsz;
 183         cu->cu_recvsz = recvsz;
 184
 185         cu->cu_retry_timeout.tv_sec = 1;
 186         cu->cu_retry_timeout.tv_usec = 0;
 187         if (retry_timeout != NULL) cu->cu_retry_timeout = *retry_timeout;
 188
 189         cu->cu_total_timeout.tv_sec = -1;
 190         cu->cu_total_timeout.tv_usec = -1;
 191         if (total_timeout != NULL) cu->cu_total_timeout = *total_timeout;
 192
 193         rfd = open("/dev/random", O_RDONLY, 0);
 194         if ((rfd < 0) || (read(rfd, &call_msg.rm_xid, sizeof(call_msg.rm_xid)) != sizeof(call_msg.rm_xid)))
 195         {
 196                 gettimeofday(&now, (struct timezone *)0);
 197                 call_msg.rm_xid = getpid() ^ now.tv_sec ^ now.tv_usec;
 198         }
 199
 200         if (rfd > 0) close(rfd);
 201
 202         call_msg.rm_direction = CALL;
 203         call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 204         call_msg.rm_call.cb_prog = program;
 205         call_msg.rm_call.cb_vers = version;
 206         xdrmem_create(&(cu->cu_outxdrs), cu->cu_outbuf, sendsz, XDR_ENCODE);
 207         if (! xdr_callhdr(&(cu->cu_outxdrs), &call_msg)) goto fooy;
 208
 209         cu->cu_xdrpos = XDR_GETPOS(&(cu->cu_outxdrs));
 210         if (*sockp < 0)
 211         {
 212                 int dontblock = 1;
 213
 214                 *sockp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 215                 if (*sockp < 0)
 216                 {
 217                         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 218                         rpc_createerr.cf_error.re_errno = errno;
 219                         goto fooy;
 220                 }
 221
 222                 /* attempt to bind to prov port */
 223                 (void)bindresvport(*sockp, (struct sockaddr_in *)0);
 224
 225                 /* the socket's rpc controls are non-blocking */
 226                 (void)ioctl(*sockp, FIONBIO, (char *) &dontblock);
 227                 cu->cu_closeit = TRUE;
 228
 229                 /* set receive size */
 230                 rsize = 0;
 231                 len = sizeof(rsize);
 232                 if (getsockopt(*sockp, SOL_SOCKET, SO_RCVBUF, (char *)&rsize, &len) != 0)
 233                 {
 234                         close(*sockp);
 235                         *sockp = -1;
 236                         goto fooy;
 237                 }
 238
 239                 len = sizeof(recvsz);
 240                 if ((recvsz > rsize) && (setsockopt(*sockp, SOL_SOCKET, SO_RCVBUF, (char *)&recvsz, len)))
 241                 {
 242                         close(*sockp);
 243                         *sockp = -1;
 244                         goto fooy;
 245                 }
 246         }
 247         else
 248         {
 249                 cu->cu_closeit = FALSE;
 250         }
 251
 252         cu->cu_sock = *sockp;
 253         cl->cl_auth = authnone_create();
 254         return (cl);
 255
 256 fooy:
 257         if (cu) mem_free((caddr_t)cu, sizeof(*cu) + sendsz + recvsz);
 258         if (cl) mem_free((caddr_t)cl, sizeof(CLIENT));
 259         return NULL;
 260 }
 261
 262 CLIENT *
 263 clntudp_bufcreate(raddr, program, version, wait, sockp, sendsz, recvsz)
 264 #ifdef __LP64__
 265         struct sockaddr_in *raddr;
 266         uint32_t program;
 267         uint32_t version;
 268         struct timeval wait;
 269         int *sockp;
 270         uint32_t sendsz;
 271         uint32_t recvsz;
 272 #else
 273         struct sockaddr_in *raddr;
 274         u_long program;
 275         u_long version;
 276         struct timeval wait;
 277         register int *sockp;
 278         u_int sendsz;
 279         u_int recvsz;
 280 #endif
 281 {
 282         return clntudp_bufcreate_timeout(raddr, (uint32_t)program, (uint32_t)version, sockp, (uint32_t)sendsz, (uint32_t)recvsz, &wait, NULL);
 283 }
 284
 285 CLIENT *
 286 clntudp_create(raddr, program, version, wait, sockp)
 287 #ifdef __LP64__
 288         struct sockaddr_in *raddr;
 289         uint32_t program;
 290         uint32_t version;
 291         struct timeval wait;
 292         int *sockp;
 293 #else
 294         struct sockaddr_in *raddr;
 295         u_long program;
 296         u_long version;
 297         struct timeval wait;
 298         register int *sockp;
 299 #endif
 300 {
 301
 302         return clntudp_bufcreate(raddr, program, version, wait, sockp, UDPMSGSIZE, UDPMSGSIZE);
 303 }
 304
 305 static enum clnt_stat
 306 clntudp_call(cl, proc, xargs, argsp, xresults, resultsp, utimeout)
 307         register CLIENT *cl;            /* client handle */
 308 #ifdef __LP64__
 309         uint32_t                proc;           /* procedure number */
 310 #else
 311         u_long          proc;           /* procedure number */
 312 #endif
 313         xdrproc_t       xargs;          /* xdr routine for args */
 314         caddr_t         argsp;          /* pointer to args */
 315         xdrproc_t       xresults;       /* xdr routine for results */
 316         caddr_t         resultsp;       /* pointer to results */
 317         struct timeval  utimeout;       /* seconds to wait before giving up */
 318 {
 319         register struct cu_data *cu = (struct cu_data *)cl->cl_private;
 320         register XDR *xdrs;
 321         register int outlen;
 322         register int inlen;
 323         u_int32_t fromlen;
 324         fd_set readfds;
 325         fd_set mask;
 326         struct sockaddr_in from;
 327         struct rpc_msg reply_msg;
 328         XDR reply_xdrs;
 329         struct timeval time_waited;
 330         bool_t ok;
 331         int nrefreshes = 2;     /* number of times to refresh cred */
 332         struct timeval timeout;
 333
 334         if (cu->cu_total_timeout.tv_sec == -1)
 335         {
 336                 /* use supplied total timeout */
 337                 timeout = utimeout;
 338         }
 339         else
 340         {
 341                 /* use client's total timeout */
 342                 timeout = cu->cu_total_timeout;
 343         }
 344
 345         time_waited.tv_sec = 0;
 346         time_waited.tv_usec = 0;
 347
 348 call_again:
 349         xdrs = &(cu->cu_outxdrs);
 350         xdrs->x_op = XDR_ENCODE;
 351         XDR_SETPOS(xdrs, cu->cu_xdrpos);
 352
 353         /*
 354          * the transaction is the first thing in the out buffer
 355          */
 356         (*(u_short *)(cu->cu_outbuf))++;
 357 #ifdef __LP64__
 358         if ((! XDR_PUTLONG(xdrs, (int *)&proc)) ||
 359             (! AUTH_MARSHALL(cl->cl_auth, xdrs)) ||
 360             (! (*xargs)(xdrs, argsp, 0)))
 361                 return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
 362 #else
 363         if ((! XDR_PUTLONG(xdrs, (long *)&proc)) ||
 364             (! AUTH_MARSHALL(cl->cl_auth, xdrs)) ||
 365             (! (*xargs)(xdrs, argsp, 0)))
 366                 return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
 367 #endif
 368         outlen = (int)XDR_GETPOS(xdrs);
 369
 370 send_again:
 371         if (sendto(cu->cu_sock, cu->cu_outbuf, outlen, 0, (struct sockaddr *)&(cu->cu_raddr), cu->cu_rlen) != outlen)
 372         {
 373                 cu->cu_error.re_errno = errno;
 374                 return (cu->cu_error.re_status = RPC_CANTSEND);
 375         }
 376
 377         /*
 378          * Hack to provide rpc-based message passing
 379          */
 380         if (timeout.tv_sec == 0 && timeout.tv_usec == 0)
 381         {
 382                 return (cu->cu_error.re_status = RPC_TIMEDOUT);
 383         }
 384
 385         /*
 386          * sub-optimal code appears here because we have
 387          * some clock time to spare while the packets are in flight.
 388          * (We assume that this is actually only executed once.)
 389          */
 390         reply_msg.acpted_rply.ar_verf = _null_auth;
 391         reply_msg.acpted_rply.ar_results.where = resultsp;
 392         reply_msg.acpted_rply.ar_results.proc = xresults;
 393         FD_ZERO(&mask);
 394         FD_SET(cu->cu_sock, &mask);
 395         for (;;)
 396         {
 397                 readfds = mask;
 398                 switch (select(cu->cu_sock+1, &readfds, NULL, NULL, &(cu->cu_retry_timeout))) {
 399                 case 0:
 400                         time_waited.tv_sec += cu->cu_retry_timeout.tv_sec;
 401                         time_waited.tv_usec += cu->cu_retry_timeout.tv_usec;
 402                         while (time_waited.tv_usec >= 1000000) {
 403                                 time_waited.tv_sec++;
 404                                 time_waited.tv_usec -= 1000000;
 405                         }
 406                         if ((time_waited.tv_sec < timeout.tv_sec) ||
 407                                 ((time_waited.tv_sec == timeout.tv_sec) &&
 408                                 (time_waited.tv_usec < timeout.tv_usec)))
 409                                 goto send_again;
 410                         return (cu->cu_error.re_status = RPC_TIMEDOUT);
 411
 412                 /*
 413                  * buggy in other cases because time_waited is not being
 414                  * updated.
 415                  */
 416                 case -1:
 417                         if (errno == EINTR)
 418                                 continue;
 419                         cu->cu_error.re_errno = errno;
 420                         return (cu->cu_error.re_status = RPC_CANTRECV);
 421                 }
 422                 do {
 423                         fromlen = sizeof(struct sockaddr);
 424                         inlen = recvfrom(cu->cu_sock, cu->cu_inbuf,
 425                                 (int) cu->cu_recvsz, 0,
 426                                 (struct sockaddr *)&from, &fromlen);
 427                 } while (inlen < 0 && errno == EINTR);
 428                 if (inlen < 0) {
 429                         if (errno == EWOULDBLOCK)
 430                                 continue;
 431                         cu->cu_error.re_errno = errno;
 432                         return (cu->cu_error.re_status = RPC_CANTRECV);
 433                 }
 434 #ifdef __LP64__
 435                 if (inlen < sizeof(uint32_t))
 436                         continue;
 437                 /* see if reply transaction id matches sent id */
 438                 if (*((uint32_t *)(cu->cu_inbuf)) != *((uint32_t *)(cu->cu_outbuf))) continue;
 439 #else
 440                 if (inlen < sizeof(u_long))
 441                         continue;
 442                 /* see if reply transaction id matches sent id */
 443                 if (*((u_long *)(cu->cu_inbuf)) != *((u_long *)(cu->cu_outbuf))) continue;
 444 #endif
 445                 /* we now assume we have the proper reply */
 446                 break;
 447         }
 448
 449         /*
 450          * now decode and validate the response
 451          */
 452         xdrmem_create(&reply_xdrs, cu->cu_inbuf, (u_int)inlen, XDR_DECODE);
 453         ok = xdr_replymsg(&reply_xdrs, &reply_msg);
 454         /* XDR_DESTROY(&reply_xdrs);  save a few cycles on noop destroy */
 455         if (ok) {
 456                 _seterr_reply(&reply_msg, &(cu->cu_error));
 457                 if (cu->cu_error.re_status == RPC_SUCCESS) {
 458                         if (! AUTH_VALIDATE(cl->cl_auth,
 459                                 &reply_msg.acpted_rply.ar_verf)) {
 460                                 cu->cu_error.re_status = RPC_AUTHERROR;
 461                                 cu->cu_error.re_why = AUTH_INVALIDRESP;
 462                         }
 463                         if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
 464                                 xdrs->x_op = XDR_FREE;
 465                                 (void)xdr_opaque_auth(xdrs,
 466                                     &(reply_msg.acpted_rply.ar_verf));
 467                         }
 468                 }  /* end successful completion */
 469                 else {
 470                         /* maybe our credentials need to be refreshed ... */
 471                         if (nrefreshes > 0 && AUTH_REFRESH(cl->cl_auth)) {
 472                                 nrefreshes--;
 473                                 goto call_again;
 474                         }
 475                 }  /* end of unsuccessful completion */
 476         }  /* end of valid reply message */
 477         else {
 478                 cu->cu_error.re_status = RPC_CANTDECODERES;
 479         }
 480         return (cu->cu_error.re_status);
 481 }
 482
 483 static void
 484 clntudp_geterr(cl, errp)
 485         CLIENT *cl;
 486         struct rpc_err *errp;
 487 {
 488         register struct cu_data *cu = (struct cu_data *)cl->cl_private;
 489
 490         *errp = cu->cu_error;
 491 }
 492
 493
 494 static bool_t
 495 clntudp_freeres(cl, xdr_res, res_ptr)
 496         CLIENT *cl;
 497         xdrproc_t xdr_res;
 498         caddr_t res_ptr;
 499 {
 500         register struct cu_data *cu = (struct cu_data *)cl->cl_private;
 501         register XDR *xdrs = &(cu->cu_outxdrs);
 502
 503         xdrs->x_op = XDR_FREE;
 504         return ((*xdr_res)(xdrs, res_ptr, 0));
 505 }
 506
 507 static void
 508 clntudp_abort(/*h*/)
 509         /*CLIENT *h;*/
 510 {
 511 }
 512
 513 static bool_t
 514 clntudp_control(cl, request, info)
 515         CLIENT *cl;
 516         int request;
 517         char *info;
 518 {
 519         register struct cu_data *cu = (struct cu_data *)cl->cl_private;
 520
 521         switch (request) {
 522         case CLSET_TIMEOUT:
 523                 cu->cu_total_timeout = *(struct timeval *)info;
 524                 break;
 525         case CLGET_TIMEOUT:
 526                 *(struct timeval *)info = cu->cu_total_timeout;
 527                 break;
 528         case CLSET_RETRY_TIMEOUT:
 529                 cu->cu_retry_timeout = *(struct timeval *)info;
 530                 break;
 531         case CLGET_RETRY_TIMEOUT:
 532                 *(struct timeval *)info = cu->cu_retry_timeout;
 533                 break;
 534         case CLGET_SERVER_ADDR:
 535                 *(struct sockaddr_in *)info = cu->cu_raddr;
 536                 break;
 537         default:
 538                 return (FALSE);
 539         }
 540         return (TRUE);
 541 }
 542
 543 static void
 544 clntudp_destroy(cl)
 545         CLIENT *cl;
 546 {
 547         register struct cu_data *cu = (struct cu_data *)cl->cl_private;
 548
 549         if (cu->cu_closeit) {
 550                 (void)close(cu->cu_sock);
 551         }
 552         XDR_DESTROY(&(cu->cu_outxdrs));
 553         mem_free((caddr_t)cu, (sizeof(*cu) + cu->cu_sendsz + cu->cu_recvsz));
 554         mem_free((caddr_t)cl, sizeof(CLIENT));
 555 }