xdr_rec.c revision 1.31.8.1
1 /* $NetBSD: xdr_rec.c,v 1.31.8.1 2013/03/14 22:03:12 riz Exp $ */ 2 3 /* 4 * Copyright (c) 2010, Oracle America, Inc. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: 9 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * * Redistributions in binary form must reproduce the above 13 * copyright notice, this list of conditions and the following 14 * disclaimer in the documentation and/or other materials 15 * provided with the distribution. 16 * * Neither the name of the "Oracle America, Inc." nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #if defined(LIBC_SCCS) && !defined(lint) 36 #if 0 37 static char *sccsid = "@(#)xdr_rec.c 1.21 87/08/11 Copyr 1984 Sun Micro"; 38 static char *sccsid = "@(#)xdr_rec.c 2.2 88/08/01 4.0 RPCSRC"; 39 #else 40 __RCSID("$NetBSD: xdr_rec.c,v 1.31.8.1 2013/03/14 22:03:12 riz Exp $"); 41 #endif 42 #endif 43 44 /* 45 * xdr_rec.c, Implements TCP/IP based XDR streams with a "record marking" 46 * layer above tcp (for rpc's use). 47 * 48 * Copyright (C) 1984, Sun Microsystems, Inc. 49 * 50 * These routines interface XDRSTREAMS to a tcp/ip connection. 51 * There is a record marking layer between the xdr stream 52 * and the tcp transport level. A record is composed on one or more 53 * record fragments. A record fragment is a thirty-two bit header followed 54 * by n bytes of data, where n is contained in the header. The header 55 * is represented as a htonl(u_long). Thegh order bit encodes 56 * whether or not the fragment is the last fragment of the record 57 * (1 => fragment is last, 0 => more fragments to follow. 58 * The other 31 bits encode the byte length of the fragment. 59 */ 60 61 #include "namespace.h" 62 63 #include <sys/types.h> 64 65 #include <netinet/in.h> 66 67 #include <err.h> 68 #include <stddef.h> 69 #include <stdio.h> 70 #include <stdlib.h> 71 #include <string.h> 72 73 #include <rpc/types.h> 74 #include <rpc/xdr.h> 75 #include <rpc/auth.h> 76 #include <rpc/svc.h> 77 #include <rpc/clnt.h> 78 79 #include "rpc_internal.h" 80 81 #ifdef __weak_alias 82 __weak_alias(xdrrec_create,_xdrrec_create) 83 __weak_alias(xdrrec_endofrecord,_xdrrec_endofrecord) 84 __weak_alias(xdrrec_eof,_xdrrec_eof) 85 __weak_alias(xdrrec_skiprecord,_xdrrec_skiprecord) 86 #endif 87 88 static bool_t xdrrec_getlong __P((XDR *, long *)); 89 static bool_t xdrrec_putlong __P((XDR *, const long *)); 90 static bool_t xdrrec_getbytes __P((XDR *, char *, u_int)); 91 92 static bool_t xdrrec_putbytes __P((XDR *, const char *, u_int)); 93 static u_int xdrrec_getpos __P((XDR *)); 94 static bool_t xdrrec_setpos __P((XDR *, u_int)); 95 static int32_t *xdrrec_inline __P((XDR *, u_int)); 96 static void xdrrec_destroy __P((XDR *)); 97 98 static const struct xdr_ops xdrrec_ops = { 99 xdrrec_getlong, 100 xdrrec_putlong, 101 xdrrec_getbytes, 102 xdrrec_putbytes, 103 xdrrec_getpos, 104 xdrrec_setpos, 105 xdrrec_inline, 106 xdrrec_destroy, 107 NULL, /* xdrrec_control */ 108 }; 109 110 /* 111 * A record is composed of one or more record fragments. 112 * A record fragment is a four-byte header followed by zero to 113 * 2**32-1 bytes. The header is treated as a long unsigned and is 114 * encode/decoded to the network via htonl/ntohl. The low order 31 bits 115 * are a byte count of the fragment. The highest order bit is a boolean: 116 * 1 => this fragment is the last fragment of the record, 117 * 0 => this fragment is followed by more fragment(s). 118 * 119 * The fragment/record machinery is not general; it is constructed to 120 * meet the needs of xdr and rpc based on tcp. 121 */ 122 123 #define LAST_FRAG ((u_int32_t)(1 << 31)) 124 125 typedef struct rec_strm { 126 char *tcp_handle; 127 /* 128 * out-goung bits 129 */ 130 int (*writeit) __P((char *, char *, int)); 131 char *out_base; /* output buffer (points to frag header) */ 132 char *out_finger; /* next output position */ 133 char *out_boundry; /* data cannot up to this address */ 134 u_int32_t *frag_header; /* beginning of curren fragment */ 135 bool_t frag_sent; /* true if buffer sent in middle of record */ 136 /* 137 * in-coming bits 138 */ 139 int (*readit) __P((char *, char *, int)); 140 u_long in_size; /* fixed size of the input buffer */ 141 char *in_base; 142 char *in_finger; /* location of next byte to be had */ 143 char *in_boundry; /* can read up to this location */ 144 long fbtbc; /* fragment bytes to be consumed */ 145 bool_t last_frag; 146 u_int sendsize; 147 u_int recvsize; 148 149 bool_t nonblock; 150 bool_t in_haveheader; 151 u_int32_t in_header; 152 char *in_hdrp; 153 int in_hdrlen; 154 int in_reclen; 155 int in_received; 156 int in_maxrec; 157 } RECSTREAM; 158 159 static u_int fix_buf_size __P((u_int)); 160 static bool_t flush_out __P((RECSTREAM *, bool_t)); 161 static bool_t fill_input_buf __P((RECSTREAM *)); 162 static bool_t get_input_bytes __P((RECSTREAM *, char *, u_int)); 163 static bool_t set_input_fragment __P((RECSTREAM *)); 164 static bool_t skip_input_bytes __P((RECSTREAM *, long)); 165 static bool_t realloc_stream __P((RECSTREAM *, int)); 166 167 168 /* 169 * Create an xdr handle for xdrrec 170 * xdrrec_create fills in xdrs. Sendsize and recvsize are 171 * send and recv buffer sizes (0 => use default). 172 * tcp_handle is an opaque handle that is passed as the first parameter to 173 * the procedures readit and writeit. Readit and writeit are read and 174 * write respectively. They are like the system 175 * calls expect that they take an opaque handle rather than an fd. 176 */ 177 void 178 xdrrec_create(xdrs, sendsize, recvsize, tcp_handle, readit, writeit) 179 XDR *xdrs; 180 u_int sendsize; 181 u_int recvsize; 182 char *tcp_handle; 183 /* like read, but pass it a tcp_handle, not sock */ 184 int (*readit) __P((char *, char *, int)); 185 /* like write, but pass it a tcp_handle, not sock */ 186 int (*writeit) __P((char *, char *, int)); 187 { 188 RECSTREAM *rstrm = mem_alloc(sizeof(RECSTREAM)); 189 190 if (rstrm == NULL) { 191 warnx("xdrrec_create: out of memory"); 192 /* 193 * This is bad. Should rework xdrrec_create to 194 * return a handle, and in this case return NULL 195 */ 196 return; 197 } 198 199 rstrm->sendsize = sendsize = fix_buf_size(sendsize); 200 rstrm->out_base = malloc(rstrm->sendsize); 201 if (rstrm->out_base == NULL) { 202 warnx("xdrrec_create: out of memory"); 203 mem_free(rstrm, sizeof(RECSTREAM)); 204 return; 205 } 206 207 rstrm->recvsize = recvsize = fix_buf_size(recvsize); 208 rstrm->in_base = malloc(recvsize); 209 if (rstrm->in_base == NULL) { 210 warnx("xdrrec_create: out of memory"); 211 mem_free(rstrm->out_base, sendsize); 212 mem_free(rstrm, sizeof(RECSTREAM)); 213 return; 214 } 215 /* 216 * now the rest ... 217 */ 218 xdrs->x_ops = &xdrrec_ops; 219 xdrs->x_private = rstrm; 220 rstrm->tcp_handle = tcp_handle; 221 rstrm->readit = readit; 222 rstrm->writeit = writeit; 223 rstrm->out_finger = rstrm->out_boundry = rstrm->out_base; 224 rstrm->frag_header = (u_int32_t *)(void *)rstrm->out_base; 225 rstrm->out_finger += sizeof(u_int32_t); 226 rstrm->out_boundry += sendsize; 227 rstrm->frag_sent = FALSE; 228 rstrm->in_size = recvsize; 229 rstrm->in_boundry = rstrm->in_base; 230 rstrm->in_finger = (rstrm->in_boundry += recvsize); 231 rstrm->fbtbc = 0; 232 rstrm->last_frag = TRUE; 233 rstrm->in_haveheader = FALSE; 234 rstrm->in_hdrlen = 0; 235 rstrm->in_hdrp = (char *)(void *)&rstrm->in_header; 236 rstrm->nonblock = FALSE; 237 rstrm->in_reclen = 0; 238 rstrm->in_received = 0; 239 } 240 241 242 /* 243 * The reoutines defined below are the xdr ops which will go into the 244 * xdr handle filled in by xdrrec_create. 245 */ 246 247 static bool_t 248 xdrrec_getlong(xdrs, lp) 249 XDR *xdrs; 250 long *lp; 251 { 252 RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); 253 int32_t *buflp = (int32_t *)(void *)(rstrm->in_finger); 254 int32_t mylong; 255 256 /* first try the inline, fast case */ 257 if ((rstrm->fbtbc >= (long)sizeof(int32_t)) && 258 (((uintptr_t)rstrm->in_boundry - (uintptr_t)buflp) >= sizeof(int32_t))) { 259 *lp = (long)ntohl((u_int32_t)(*buflp)); 260 rstrm->fbtbc -= sizeof(int32_t); 261 rstrm->in_finger += sizeof(int32_t); 262 } else { 263 if (! xdrrec_getbytes(xdrs, (char *)(void *)&mylong, 264 sizeof(int32_t))) 265 return (FALSE); 266 *lp = (long)ntohl((u_int32_t)mylong); 267 } 268 return (TRUE); 269 } 270 271 static bool_t 272 xdrrec_putlong(xdrs, lp) 273 XDR *xdrs; 274 const long *lp; 275 { 276 RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); 277 int32_t *dest_lp = ((int32_t *)(void *)(rstrm->out_finger)); 278 279 if ((rstrm->out_finger += sizeof(int32_t)) > rstrm->out_boundry) { 280 /* 281 * this case should almost never happen so the code is 282 * inefficient 283 */ 284 rstrm->out_finger -= sizeof(int32_t); 285 rstrm->frag_sent = TRUE; 286 if (! flush_out(rstrm, FALSE)) 287 return (FALSE); 288 dest_lp = ((int32_t *)(void *)(rstrm->out_finger)); 289 rstrm->out_finger += sizeof(int32_t); 290 } 291 *dest_lp = (int32_t)htonl((u_int32_t)(*lp)); 292 return (TRUE); 293 } 294 295 static bool_t /* must manage buffers, fragments, and records */ 296 xdrrec_getbytes(xdrs, addr, len) 297 XDR *xdrs; 298 char *addr; 299 u_int len; 300 { 301 RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); 302 u_int current; 303 304 while (len > 0) { 305 current = (u_int)rstrm->fbtbc; 306 if (current == 0) { 307 if (rstrm->last_frag) 308 return (FALSE); 309 if (! set_input_fragment(rstrm)) 310 return (FALSE); 311 continue; 312 } 313 current = (len < current) ? len : current; 314 if (! get_input_bytes(rstrm, addr, current)) 315 return (FALSE); 316 addr += current; 317 rstrm->fbtbc -= current; 318 len -= current; 319 } 320 return (TRUE); 321 } 322 323 static bool_t 324 xdrrec_putbytes(xdrs, addr, len) 325 XDR *xdrs; 326 const char *addr; 327 u_int len; 328 { 329 RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); 330 size_t current; 331 332 while (len > 0) { 333 current = (size_t)((u_long)rstrm->out_boundry - 334 (u_long)rstrm->out_finger); 335 current = (len < current) ? len : current; 336 memmove(rstrm->out_finger, addr, current); 337 rstrm->out_finger += current; 338 addr += current; 339 len -= current; 340 if (rstrm->out_finger == rstrm->out_boundry) { 341 rstrm->frag_sent = TRUE; 342 if (! flush_out(rstrm, FALSE)) 343 return (FALSE); 344 } 345 } 346 return (TRUE); 347 } 348 349 static u_int 350 xdrrec_getpos(xdrs) 351 XDR *xdrs; 352 { 353 RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; 354 off_t pos; 355 356 pos = lseek((int)(u_long)rstrm->tcp_handle, (off_t)0, 1); 357 if (pos != -1) 358 switch (xdrs->x_op) { 359 360 case XDR_ENCODE: 361 pos += rstrm->out_finger - rstrm->out_base; 362 break; 363 364 case XDR_DECODE: 365 pos -= rstrm->in_boundry - rstrm->in_finger; 366 break; 367 368 default: 369 pos = (off_t) -1; 370 break; 371 } 372 return ((u_int) pos); 373 } 374 375 static bool_t 376 xdrrec_setpos(xdrs, pos) 377 XDR *xdrs; 378 u_int pos; 379 { 380 RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; 381 u_int currpos = xdrrec_getpos(xdrs); 382 int delta = currpos - pos; 383 char *newpos; 384 385 if ((int)currpos != -1) 386 switch (xdrs->x_op) { 387 388 case XDR_ENCODE: 389 newpos = rstrm->out_finger - delta; 390 if ((newpos > (char *)(void *)(rstrm->frag_header)) && 391 (newpos < rstrm->out_boundry)) { 392 rstrm->out_finger = newpos; 393 return (TRUE); 394 } 395 break; 396 397 case XDR_DECODE: 398 newpos = rstrm->in_finger - delta; 399 if ((delta < (int)(rstrm->fbtbc)) && 400 (newpos <= rstrm->in_boundry) && 401 (newpos >= rstrm->in_base)) { 402 rstrm->in_finger = newpos; 403 rstrm->fbtbc -= delta; 404 return (TRUE); 405 } 406 break; 407 408 case XDR_FREE: 409 break; 410 } 411 return (FALSE); 412 } 413 414 static int32_t * 415 xdrrec_inline(xdrs, len) 416 XDR *xdrs; 417 u_int len; 418 { 419 RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; 420 int32_t *buf = NULL; 421 422 switch (xdrs->x_op) { 423 424 case XDR_ENCODE: 425 if ((rstrm->out_finger + len) <= rstrm->out_boundry) { 426 buf = (int32_t *)(void *)rstrm->out_finger; 427 rstrm->out_finger += len; 428 } 429 break; 430 431 case XDR_DECODE: 432 if ((len <= (u_int)rstrm->fbtbc) && 433 ((rstrm->in_finger + len) <= rstrm->in_boundry)) { 434 buf = (int32_t *)(void *)rstrm->in_finger; 435 rstrm->fbtbc -= len; 436 rstrm->in_finger += len; 437 } 438 break; 439 440 case XDR_FREE: 441 break; 442 } 443 return (buf); 444 } 445 446 static void 447 xdrrec_destroy(xdrs) 448 XDR *xdrs; 449 { 450 RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; 451 452 mem_free(rstrm->out_base, rstrm->sendsize); 453 mem_free(rstrm->in_base, rstrm->recvsize); 454 mem_free(rstrm, sizeof(RECSTREAM)); 455 } 456 457 458 /* 459 * Exported routines to manage xdr records 460 */ 461 462 /* 463 * Before reading (deserializing from the stream, one should always call 464 * this procedure to guarantee proper record alignment. 465 */ 466 bool_t 467 xdrrec_skiprecord(xdrs) 468 XDR *xdrs; 469 { 470 RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); 471 enum xprt_stat xstat; 472 473 if (rstrm->nonblock) { 474 if (__xdrrec_getrec(xdrs, &xstat, FALSE)) { 475 rstrm->fbtbc = 0; 476 return TRUE; 477 } 478 if (rstrm->in_finger == rstrm->in_boundry && 479 xstat == XPRT_MOREREQS) { 480 rstrm->fbtbc = 0; 481 return TRUE; 482 } 483 return FALSE; 484 } 485 while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) { 486 if (! skip_input_bytes(rstrm, rstrm->fbtbc)) 487 return (FALSE); 488 rstrm->fbtbc = 0; 489 if ((! rstrm->last_frag) && (! set_input_fragment(rstrm))) 490 return (FALSE); 491 } 492 rstrm->last_frag = FALSE; 493 return (TRUE); 494 } 495 496 /* 497 * Look ahead fuction. 498 * Returns TRUE iff there is no more input in the buffer 499 * after consuming the rest of the current record. 500 */ 501 bool_t 502 xdrrec_eof(xdrs) 503 XDR *xdrs; 504 { 505 RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); 506 507 while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) { 508 if (!skip_input_bytes(rstrm, rstrm->fbtbc)) 509 return (TRUE); 510 rstrm->fbtbc = 0; 511 if ((!rstrm->last_frag) && (!set_input_fragment(rstrm))) 512 return (TRUE); 513 } 514 if (rstrm->in_finger == rstrm->in_boundry) 515 return (TRUE); 516 return (FALSE); 517 } 518 519 /* 520 * The client must tell the package when an end-of-record has occurred. 521 * The second paraemters tells whether the record should be flushed to the 522 * (output) tcp stream. (This let's the package support batched or 523 * pipelined procedure calls.) TRUE => immmediate flush to tcp connection. 524 */ 525 bool_t 526 xdrrec_endofrecord(xdrs, sendnow) 527 XDR *xdrs; 528 bool_t sendnow; 529 { 530 RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); 531 u_long len; /* fragment length */ 532 533 if (sendnow || rstrm->frag_sent || 534 ((u_long)rstrm->out_finger + sizeof(u_int32_t) >= 535 (u_long)rstrm->out_boundry)) { 536 rstrm->frag_sent = FALSE; 537 return (flush_out(rstrm, TRUE)); 538 } 539 len = (u_long)(rstrm->out_finger) - (u_long)(rstrm->frag_header) - 540 sizeof(u_int32_t); 541 *(rstrm->frag_header) = htonl((u_int32_t)len | LAST_FRAG); 542 rstrm->frag_header = (u_int32_t *)(void *)rstrm->out_finger; 543 rstrm->out_finger += sizeof(u_int32_t); 544 return (TRUE); 545 } 546 547 /* 548 * Fill the stream buffer with a record for a non-blocking connection. 549 * Return true if a record is available in the buffer, false if not. 550 */ 551 bool_t 552 __xdrrec_getrec(xdrs, statp, expectdata) 553 XDR *xdrs; 554 enum xprt_stat *statp; 555 bool_t expectdata; 556 { 557 RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); 558 ssize_t n; 559 int fraglen; 560 561 if (!rstrm->in_haveheader) { 562 n = rstrm->readit(rstrm->tcp_handle, rstrm->in_hdrp, 563 (int)sizeof (rstrm->in_header) - rstrm->in_hdrlen); 564 if (n == 0) { 565 *statp = expectdata ? XPRT_DIED : XPRT_IDLE; 566 return FALSE; 567 } 568 if (n < 0) { 569 *statp = XPRT_DIED; 570 return FALSE; 571 } 572 rstrm->in_hdrp += n; 573 rstrm->in_hdrlen += n; 574 if (rstrm->in_hdrlen < (int)sizeof(rstrm->in_header)) { 575 *statp = XPRT_MOREREQS; 576 return FALSE; 577 } 578 rstrm->in_header = ntohl(rstrm->in_header); 579 fraglen = (int)(rstrm->in_header & ~LAST_FRAG); 580 if (fraglen == 0 || fraglen > rstrm->in_maxrec || 581 (rstrm->in_reclen + fraglen) > rstrm->in_maxrec) { 582 *statp = XPRT_DIED; 583 return FALSE; 584 } 585 rstrm->in_reclen += fraglen; 586 if ((u_int)rstrm->in_reclen > rstrm->recvsize) { 587 if (!realloc_stream(rstrm, rstrm->in_reclen)) { 588 *statp = XPRT_DIED; 589 return FALSE; 590 } 591 } 592 if (rstrm->in_header & LAST_FRAG) { 593 rstrm->in_header &= ~LAST_FRAG; 594 rstrm->last_frag = TRUE; 595 } 596 } 597 598 n = rstrm->readit(rstrm->tcp_handle, 599 rstrm->in_base + rstrm->in_received, 600 (rstrm->in_reclen - rstrm->in_received)); 601 602 if (n < 0) { 603 *statp = XPRT_DIED; 604 return FALSE; 605 } 606 607 if (n == 0) { 608 *statp = expectdata ? XPRT_DIED : XPRT_IDLE; 609 return FALSE; 610 } 611 612 rstrm->in_received += n; 613 614 if (rstrm->in_received == rstrm->in_reclen) { 615 rstrm->in_haveheader = FALSE; 616 rstrm->in_hdrp = (char *)(void *)&rstrm->in_header; 617 rstrm->in_hdrlen = 0; 618 if (rstrm->last_frag) { 619 rstrm->fbtbc = rstrm->in_reclen; 620 rstrm->in_boundry = rstrm->in_base + rstrm->in_reclen; 621 rstrm->in_finger = rstrm->in_base; 622 rstrm->in_reclen = rstrm->in_received = 0; 623 *statp = XPRT_MOREREQS; 624 return TRUE; 625 } 626 } 627 628 *statp = XPRT_MOREREQS; 629 return FALSE; 630 } 631 632 bool_t 633 __xdrrec_setnonblock(xdrs, maxrec) 634 XDR *xdrs; 635 int maxrec; 636 { 637 RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); 638 639 rstrm->nonblock = TRUE; 640 if (maxrec == 0) 641 maxrec = rstrm->recvsize; 642 rstrm->in_maxrec = maxrec; 643 return TRUE; 644 } 645 646 647 /* 648 * Internal useful routines 649 */ 650 static bool_t 651 flush_out(rstrm, eor) 652 RECSTREAM *rstrm; 653 bool_t eor; 654 { 655 u_int32_t eormask = (eor == TRUE) ? LAST_FRAG : 0; 656 u_int32_t len = (u_int32_t)((u_long)(rstrm->out_finger) - 657 (u_long)(rstrm->frag_header) - sizeof(u_int32_t)); 658 659 *(rstrm->frag_header) = htonl(len | eormask); 660 len = (u_int32_t)((u_long)(rstrm->out_finger) - 661 (u_long)(rstrm->out_base)); 662 if ((*(rstrm->writeit))(rstrm->tcp_handle, rstrm->out_base, (int)len) 663 != (int)len) 664 return (FALSE); 665 rstrm->frag_header = (u_int32_t *)(void *)rstrm->out_base; 666 rstrm->out_finger = (char *)rstrm->out_base + sizeof(u_int32_t); 667 return (TRUE); 668 } 669 670 static bool_t /* knows nothing about records! Only about input buffers */ 671 fill_input_buf(rstrm) 672 RECSTREAM *rstrm; 673 { 674 char *where; 675 u_int32_t i; 676 int len; 677 678 if (rstrm->nonblock) 679 return FALSE; 680 where = rstrm->in_base; 681 i = (u_int32_t)((u_long)rstrm->in_boundry % BYTES_PER_XDR_UNIT); 682 where += i; 683 len = (u_int32_t)(rstrm->in_size - i); 684 if ((len = (*(rstrm->readit))(rstrm->tcp_handle, where, len)) == -1) 685 return (FALSE); 686 rstrm->in_finger = where; 687 where += len; 688 rstrm->in_boundry = where; 689 return (TRUE); 690 } 691 692 static bool_t /* knows nothing about records! Only about input buffers */ 693 get_input_bytes(rstrm, addr, len) 694 RECSTREAM *rstrm; 695 char *addr; 696 u_int len; 697 { 698 u_int current; 699 700 if (rstrm->nonblock) { 701 if (len > ((uintptr_t)rstrm->in_boundry - (uintptr_t)rstrm->in_finger)) 702 return FALSE; 703 memcpy(addr, rstrm->in_finger, len); 704 rstrm->in_finger += len; 705 return TRUE; 706 } 707 708 while (len > 0) { 709 current = ((uintptr_t)rstrm->in_boundry - 710 (uintptr_t)rstrm->in_finger); 711 if (current == 0) { 712 if (! fill_input_buf(rstrm)) 713 return (FALSE); 714 continue; 715 } 716 current = (len < current) ? len : current; 717 memmove(addr, rstrm->in_finger, current); 718 rstrm->in_finger += current; 719 addr += current; 720 len -= current; 721 } 722 return (TRUE); 723 } 724 725 static bool_t /* next two bytes of the input stream are treated as a header */ 726 set_input_fragment(rstrm) 727 RECSTREAM *rstrm; 728 { 729 u_int32_t header; 730 731 if (rstrm->nonblock) 732 return FALSE; 733 if (! get_input_bytes(rstrm, (char *)(void *)&header, sizeof(header))) 734 return (FALSE); 735 header = ntohl(header); 736 rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE; 737 /* 738 * Sanity check. Try not to accept wildly incorrect 739 * record sizes. Unfortunately, the only record size 740 * we can positively identify as being 'wildly incorrect' 741 * is zero. Ridiculously large record sizes may look wrong, 742 * but we don't have any way to be certain that they aren't 743 * what the client actually intended to send us. 744 */ 745 if (header == 0) 746 return(FALSE); 747 rstrm->fbtbc = header & (~LAST_FRAG); 748 return (TRUE); 749 } 750 751 static bool_t /* consumes input bytes; knows nothing about records! */ 752 skip_input_bytes(rstrm, cnt) 753 RECSTREAM *rstrm; 754 long cnt; 755 { 756 u_int32_t current; 757 758 while (cnt > 0) { 759 current = (size_t)((long)rstrm->in_boundry - 760 (long)rstrm->in_finger); 761 if (current == 0) { 762 if (! fill_input_buf(rstrm)) 763 return (FALSE); 764 continue; 765 } 766 current = ((u_int32_t)cnt < current) ? (u_int32_t)cnt : current; 767 rstrm->in_finger += current; 768 cnt -= current; 769 } 770 return (TRUE); 771 } 772 773 static u_int 774 fix_buf_size(s) 775 u_int s; 776 { 777 778 if (s < 100) 779 s = 4000; 780 return (RNDUP(s)); 781 } 782 783 /* 784 * Reallocate the input buffer for a non-block stream. 785 */ 786 static bool_t 787 realloc_stream(rstrm, size) 788 RECSTREAM *rstrm; 789 int size; 790 { 791 ptrdiff_t diff; 792 char *buf; 793 794 if ((u_int)size > rstrm->recvsize) { 795 buf = realloc(rstrm->in_base, (size_t)size); 796 if (buf == NULL) 797 return FALSE; 798 diff = buf - rstrm->in_base; 799 rstrm->in_finger += diff; 800 rstrm->in_base = buf; 801 rstrm->in_boundry = buf + size; 802 rstrm->recvsize = size; 803 rstrm->in_size = size; 804 } 805 806 return TRUE; 807 } 808
Indexes created Thu Oct 02 14:10:14 GMT 2025