s2_pkt.c revision 279264
1/* ssl/s2_pkt.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58/* ==================================================================== 59 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 112#include "ssl_locl.h" 113#ifndef OPENSSL_NO_SSL2 114#include <stdio.h> 115#include <errno.h> 116#define USE_SOCKETS 117 118static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend); 119static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len); 120static int write_pending(SSL *s, const unsigned char *buf, unsigned int len); 121static int ssl_mt_error(int n); 122 123 124/* SSL 2.0 imlementation for SSL_read/SSL_peek - 125 * This routine will return 0 to len bytes, decrypted etc if required. 126 */ 127static int ssl2_read_internal(SSL *s, void *buf, int len, int peek) 128 { 129 int n; 130 unsigned char mac[MAX_MAC_SIZE]; 131 unsigned char *p; 132 int i; 133 int mac_size; 134 135 ssl2_read_again: 136 if (SSL_in_init(s) && !s->in_handshake) 137 { 138 n=s->handshake_func(s); 139 if (n < 0) return(n); 140 if (n == 0) 141 { 142 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_SSL_HANDSHAKE_FAILURE); 143 return(-1); 144 } 145 } 146 147 clear_sys_error(); 148 s->rwstate=SSL_NOTHING; 149 if (len <= 0) return(len); 150 151 if (s->s2->ract_data_length != 0) /* read from buffer */ 152 { 153 if (len > s->s2->ract_data_length) 154 n=s->s2->ract_data_length; 155 else 156 n=len; 157 158 memcpy(buf,s->s2->ract_data,(unsigned int)n); 159 if (!peek) 160 { 161 s->s2->ract_data_length-=n; 162 s->s2->ract_data+=n; 163 if (s->s2->ract_data_length == 0) 164 s->rstate=SSL_ST_READ_HEADER; 165 } 166 167 return(n); 168 } 169 170 /* s->s2->ract_data_length == 0 171 * 172 * Fill the buffer, then goto ssl2_read_again. 173 */ 174 175 if (s->rstate == SSL_ST_READ_HEADER) 176 { 177 if (s->first_packet) 178 { 179 n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0); 180 if (n <= 0) return(n); /* error or non-blocking */ 181 s->first_packet=0; 182 p=s->packet; 183 if (!((p[0] & 0x80) && ( 184 (p[2] == SSL2_MT_CLIENT_HELLO) || 185 (p[2] == SSL2_MT_SERVER_HELLO)))) 186 { 187 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_NON_SSLV2_INITIAL_PACKET); 188 return(-1); 189 } 190 } 191 else 192 { 193 n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0); 194 if (n <= 0) return(n); /* error or non-blocking */ 195 } 196 /* part read stuff */ 197 198 s->rstate=SSL_ST_READ_BODY; 199 p=s->packet; 200 /* Do header */ 201 /*s->s2->padding=0;*/ 202 s->s2->escape=0; 203 s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]); 204 if ((p[0] & TWO_BYTE_BIT)) /* Two byte header? */ 205 { 206 s->s2->three_byte_header=0; 207 s->s2->rlength&=TWO_BYTE_MASK; 208 } 209 else 210 { 211 s->s2->three_byte_header=1; 212 s->s2->rlength&=THREE_BYTE_MASK; 213 214 /* security >s2->escape */ 215 s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0; 216 } 217 } 218 219 if (s->rstate == SSL_ST_READ_BODY) 220 { 221 n=s->s2->rlength+2+s->s2->three_byte_header; 222 if (n > (int)s->packet_length) 223 { 224 n-=s->packet_length; 225 i=read_n(s,(unsigned int)n,(unsigned int)n,1); 226 if (i <= 0) return(i); /* ERROR */ 227 } 228 229 p= &(s->packet[2]); 230 s->rstate=SSL_ST_READ_HEADER; 231 if (s->s2->three_byte_header) 232 s->s2->padding= *(p++); 233 else s->s2->padding=0; 234 235 /* Data portion */ 236 if (s->s2->clear_text) 237 { 238 mac_size = 0; 239 s->s2->mac_data=p; 240 s->s2->ract_data=p; 241 if (s->s2->padding) 242 { 243 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING); 244 return(-1); 245 } 246 } 247 else 248 { 249 mac_size=EVP_MD_CTX_size(s->read_hash); 250 if (mac_size < 0) 251 return -1; 252 OPENSSL_assert(mac_size <= MAX_MAC_SIZE); 253 s->s2->mac_data=p; 254 s->s2->ract_data= &p[mac_size]; 255 if (s->s2->padding + mac_size > s->s2->rlength) 256 { 257 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING); 258 return(-1); 259 } 260 } 261 262 s->s2->ract_data_length=s->s2->rlength; 263 /* added a check for length > max_size in case 264 * encryption was not turned on yet due to an error */ 265 if ((!s->s2->clear_text) && 266 (s->s2->rlength >= (unsigned int)mac_size)) 267 { 268 if(!ssl2_enc(s,0)) 269 { 270 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_DECRYPTION_FAILED); 271 return(-1); 272 } 273 s->s2->ract_data_length-=mac_size; 274 ssl2_mac(s,mac,0); 275 s->s2->ract_data_length-=s->s2->padding; 276 if ( (CRYPTO_memcmp(mac,s->s2->mac_data,mac_size) != 0) || 277 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0)) 278 { 279 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE); 280 return(-1); 281 } 282 } 283 INC32(s->s2->read_sequence); /* expect next number */ 284 /* s->s2->ract_data is now available for processing */ 285 286 /* Possibly the packet that we just read had 0 actual data bytes. 287 * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.) 288 * In this case, returning 0 would be interpreted by the caller 289 * as indicating EOF, so it's not a good idea. Instead, we just 290 * continue reading; thus ssl2_read_internal may have to process 291 * multiple packets before it can return. 292 * 293 * [Note that using select() for blocking sockets *never* guarantees 294 * that the next SSL_read will not block -- the available 295 * data may contain incomplete packets, and except for SSL 2, 296 * renegotiation can confuse things even more.] */ 297 298 goto ssl2_read_again; /* This should really be 299 * "return ssl2_read(s,buf,len)", 300 * but that would allow for 301 * denial-of-service attacks if a 302 * C compiler is used that does not 303 * recognize end-recursion. */ 304 } 305 else 306 { 307 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE); 308 return(-1); 309 } 310 } 311 312int ssl2_read(SSL *s, void *buf, int len) 313 { 314 return ssl2_read_internal(s, buf, len, 0); 315 } 316 317int ssl2_peek(SSL *s, void *buf, int len) 318 { 319 return ssl2_read_internal(s, buf, len, 1); 320 } 321 322static int read_n(SSL *s, unsigned int n, unsigned int max, 323 unsigned int extend) 324 { 325 int i,off,newb; 326 327 /* if there is stuff still in the buffer from a previous read, 328 * and there is more than we want, take some. */ 329 if (s->s2->rbuf_left >= (int)n) 330 { 331 if (extend) 332 s->packet_length+=n; 333 else 334 { 335 s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]); 336 s->packet_length=n; 337 } 338 s->s2->rbuf_left-=n; 339 s->s2->rbuf_offs+=n; 340 return(n); 341 } 342 343 if (!s->read_ahead) max=n; 344 if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) 345 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2; 346 347 348 /* Else we want more than we have. 349 * First, if there is some left or we want to extend */ 350 off=0; 351 if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend)) 352 { 353 newb=s->s2->rbuf_left; 354 if (extend) 355 { 356 off=s->packet_length; 357 if (s->packet != s->s2->rbuf) 358 memcpy(s->s2->rbuf,s->packet, 359 (unsigned int)newb+off); 360 } 361 else if (s->s2->rbuf_offs != 0) 362 { 363 memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]), 364 (unsigned int)newb); 365 s->s2->rbuf_offs=0; 366 } 367 s->s2->rbuf_left=0; 368 } 369 else 370 newb=0; 371 372 /* off is the offset to start writing too. 373 * r->s2->rbuf_offs is the 'unread data', now 0. 374 * newb is the number of new bytes so far 375 */ 376 s->packet=s->s2->rbuf; 377 while (newb < (int)n) 378 { 379 clear_sys_error(); 380 if (s->rbio != NULL) 381 { 382 s->rwstate=SSL_READING; 383 i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]), 384 max-newb); 385 } 386 else 387 { 388 SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET); 389 i= -1; 390 } 391#ifdef PKT_DEBUG 392 if (s->debug & 0x01) sleep(1); 393#endif 394 if (i <= 0) 395 { 396 s->s2->rbuf_left+=newb; 397 return(i); 398 } 399 newb+=i; 400 } 401 402 /* record unread data */ 403 if (newb > (int)n) 404 { 405 s->s2->rbuf_offs=n+off; 406 s->s2->rbuf_left=newb-n; 407 } 408 else 409 { 410 s->s2->rbuf_offs=0; 411 s->s2->rbuf_left=0; 412 } 413 if (extend) 414 s->packet_length+=n; 415 else 416 s->packet_length=n; 417 s->rwstate=SSL_NOTHING; 418 return(n); 419 } 420 421int ssl2_write(SSL *s, const void *_buf, int len) 422 { 423 const unsigned char *buf=_buf; 424 unsigned int n,tot; 425 int i; 426 427 if (SSL_in_init(s) && !s->in_handshake) 428 { 429 i=s->handshake_func(s); 430 if (i < 0) return(i); 431 if (i == 0) 432 { 433 SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE); 434 return(-1); 435 } 436 } 437 438 if (s->error) 439 { 440 ssl2_write_error(s); 441 if (s->error) 442 return(-1); 443 } 444 445 clear_sys_error(); 446 s->rwstate=SSL_NOTHING; 447 if (len <= 0) return(len); 448 449 tot=s->s2->wnum; 450 s->s2->wnum=0; 451 452 n=(len-tot); 453 for (;;) 454 { 455 i=n_do_ssl_write(s,&(buf[tot]),n); 456 if (i <= 0) 457 { 458 s->s2->wnum=tot; 459 return(i); 460 } 461 if ((i == (int)n) || 462 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)) 463 { 464 return(tot+i); 465 } 466 467 n-=i; 468 tot+=i; 469 } 470 } 471 472static int write_pending(SSL *s, const unsigned char *buf, unsigned int len) 473 { 474 int i; 475 476 /* s->s2->wpend_len != 0 MUST be true. */ 477 478 /* check that they have given us the same buffer to 479 * write */ 480 if ((s->s2->wpend_tot > (int)len) || 481 ((s->s2->wpend_buf != buf) && 482 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))) 483 { 484 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY); 485 return(-1); 486 } 487 488 for (;;) 489 { 490 clear_sys_error(); 491 if (s->wbio != NULL) 492 { 493 s->rwstate=SSL_WRITING; 494 i=BIO_write(s->wbio, 495 (char *)&(s->s2->write_ptr[s->s2->wpend_off]), 496 (unsigned int)s->s2->wpend_len); 497 } 498 else 499 { 500 SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET); 501 i= -1; 502 } 503#ifdef PKT_DEBUG 504 if (s->debug & 0x01) sleep(1); 505#endif 506 if (i == s->s2->wpend_len) 507 { 508 s->s2->wpend_len=0; 509 s->rwstate=SSL_NOTHING; 510 return(s->s2->wpend_ret); 511 } 512 else if (i <= 0) 513 return(i); 514 s->s2->wpend_off+=i; 515 s->s2->wpend_len-=i; 516 } 517 } 518 519static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len) 520 { 521 unsigned int j,k,olen,p,bs; 522 int mac_size; 523 register unsigned char *pp; 524 525 olen=len; 526 527 /* first check if there is data from an encryption waiting to 528 * be sent - it must be sent because the other end is waiting. 529 * This will happen with non-blocking IO. We print it and then 530 * return. 531 */ 532 if (s->s2->wpend_len != 0) return(write_pending(s,buf,len)); 533 534 /* set mac_size to mac size */ 535 if (s->s2->clear_text) 536 mac_size=0; 537 else 538 { 539 mac_size=EVP_MD_CTX_size(s->write_hash); 540 if (mac_size < 0) 541 return -1; 542 } 543 544 /* lets set the pad p */ 545 if (s->s2->clear_text) 546 { 547 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 548 len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 549 p=0; 550 s->s2->three_byte_header=0; 551 /* len=len; */ 552 } 553 else 554 { 555 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx); 556 j=len+mac_size; 557 /* Two-byte headers allow for a larger record length than 558 * three-byte headers, but we can't use them if we need 559 * padding or if we have to set the escape bit. */ 560 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) && 561 (!s->s2->escape)) 562 { 563 if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 564 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 565 /* set k to the max number of bytes with 2 566 * byte header */ 567 k=j-(j%bs); 568 /* how many data bytes? */ 569 len=k-mac_size; 570 s->s2->three_byte_header=0; 571 p=0; 572 } 573 else if ((bs <= 1) && (!s->s2->escape)) 574 { 575 /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus 576 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */ 577 s->s2->three_byte_header=0; 578 p=0; 579 } 580 else /* we may have to use a 3 byte header */ 581 { 582 /* If s->s2->escape is not set, then 583 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus 584 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */ 585 p=(j%bs); 586 p=(p == 0)?0:(bs-p); 587 if (s->s2->escape) 588 { 589 s->s2->three_byte_header=1; 590 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) 591 j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER; 592 } 593 else 594 s->s2->three_byte_header=(p == 0)?0:1; 595 } 596 } 597 598 /* Now 599 * j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER 600 * holds, and if s->s2->three_byte_header is set, then even 601 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER. 602 */ 603 604 /* mac_size is the number of MAC bytes 605 * len is the number of data bytes we are going to send 606 * p is the number of padding bytes 607 * (if it is a two-byte header, then p == 0) */ 608 609 s->s2->wlength=len; 610 s->s2->padding=p; 611 s->s2->mac_data= &(s->s2->wbuf[3]); 612 s->s2->wact_data= &(s->s2->wbuf[3+mac_size]); 613 /* we copy the data into s->s2->wbuf */ 614 memcpy(s->s2->wact_data,buf,len); 615 if (p) 616 memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */ 617 618 if (!s->s2->clear_text) 619 { 620 s->s2->wact_data_length=len+p; 621 ssl2_mac(s,s->s2->mac_data,1); 622 s->s2->wlength+=p+mac_size; 623 if(ssl2_enc(s,1) < 1) 624 return -1; 625 } 626 627 /* package up the header */ 628 s->s2->wpend_len=s->s2->wlength; 629 if (s->s2->three_byte_header) /* 3 byte header */ 630 { 631 pp=s->s2->mac_data; 632 pp-=3; 633 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8); 634 if (s->s2->escape) pp[0]|=SEC_ESC_BIT; 635 pp[1]=s->s2->wlength&0xff; 636 pp[2]=s->s2->padding; 637 s->s2->wpend_len+=3; 638 } 639 else 640 { 641 pp=s->s2->mac_data; 642 pp-=2; 643 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT; 644 pp[1]=s->s2->wlength&0xff; 645 s->s2->wpend_len+=2; 646 } 647 s->s2->write_ptr=pp; 648 649 INC32(s->s2->write_sequence); /* expect next number */ 650 651 /* lets try to actually write the data */ 652 s->s2->wpend_tot=olen; 653 s->s2->wpend_buf=buf; 654 655 s->s2->wpend_ret=len; 656 657 s->s2->wpend_off=0; 658 return(write_pending(s,buf,olen)); 659 } 660 661int ssl2_part_read(SSL *s, unsigned long f, int i) 662 { 663 unsigned char *p; 664 int j; 665 666 if (i < 0) 667 { 668 /* ssl2_return_error(s); */ 669 /* for non-blocking io, 670 * this is not necessarily fatal */ 671 return(i); 672 } 673 else 674 { 675 s->init_num+=i; 676 677 /* Check for error. While there are recoverable errors, 678 * this function is not called when those must be expected; 679 * any error detected here is fatal. */ 680 if (s->init_num >= 3) 681 { 682 p=(unsigned char *)s->init_buf->data; 683 if (p[0] == SSL2_MT_ERROR) 684 { 685 j=(p[1]<<8)|p[2]; 686 SSLerr((int)f,ssl_mt_error(j)); 687 s->init_num -= 3; 688 if (s->init_num > 0) 689 memmove(p, p+3, s->init_num); 690 } 691 } 692 693 /* If it's not an error message, we have some error anyway -- 694 * the message was shorter than expected. This too is treated 695 * as fatal (at least if SSL_get_error is asked for its opinion). */ 696 return(0); 697 } 698 } 699 700int ssl2_do_write(SSL *s) 701 { 702 int ret; 703 704 ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num); 705 if (ret == s->init_num) 706 { 707 if (s->msg_callback) 708 s->msg_callback(1, s->version, 0, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg); 709 return(1); 710 } 711 if (ret < 0) 712 return(-1); 713 s->init_off+=ret; 714 s->init_num-=ret; 715 return(0); 716 } 717 718static int ssl_mt_error(int n) 719 { 720 int ret; 721 722 switch (n) 723 { 724 case SSL2_PE_NO_CIPHER: 725 ret=SSL_R_PEER_ERROR_NO_CIPHER; 726 break; 727 case SSL2_PE_NO_CERTIFICATE: 728 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE; 729 break; 730 case SSL2_PE_BAD_CERTIFICATE: 731 ret=SSL_R_PEER_ERROR_CERTIFICATE; 732 break; 733 case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE: 734 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE; 735 break; 736 default: 737 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE; 738 break; 739 } 740 return(ret); 741 } 742#else /* !OPENSSL_NO_SSL2 */ 743 744# if PEDANTIC 745static void *dummy=&dummy; 746# endif 747 748#endif 749