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 ssl2_enc(s,0); 269 s->s2->ract_data_length-=mac_size; 270 ssl2_mac(s,mac,0); 271 s->s2->ract_data_length-=s->s2->padding; 272 if ( (CRYPTO_memcmp(mac,s->s2->mac_data,mac_size) != 0) || 273 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0)) 274 { 275 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE); 276 return(-1); 277 } 278 } 279 INC32(s->s2->read_sequence); /* expect next number */ 280 /* s->s2->ract_data is now available for processing */ 281 282 /* Possibly the packet that we just read had 0 actual data bytes. 283 * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.) 284 * In this case, returning 0 would be interpreted by the caller 285 * as indicating EOF, so it's not a good idea. Instead, we just 286 * continue reading; thus ssl2_read_internal may have to process 287 * multiple packets before it can return. 288 * 289 * [Note that using select() for blocking sockets *never* guarantees 290 * that the next SSL_read will not block -- the available 291 * data may contain incomplete packets, and except for SSL 2, 292 * renegotiation can confuse things even more.] */ 293 294 goto ssl2_read_again; /* This should really be 295 * "return ssl2_read(s,buf,len)", 296 * but that would allow for 297 * denial-of-service attacks if a 298 * C compiler is used that does not 299 * recognize end-recursion. */ 300 } 301 else 302 { 303 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE); 304 return(-1); 305 } 306 } 307 308int ssl2_read(SSL *s, void *buf, int len) 309 { 310 return ssl2_read_internal(s, buf, len, 0); 311 } 312 313int ssl2_peek(SSL *s, void *buf, int len) 314 { 315 return ssl2_read_internal(s, buf, len, 1); 316 } 317 318static int read_n(SSL *s, unsigned int n, unsigned int max, 319 unsigned int extend) 320 { 321 int i,off,newb; 322 323 /* if there is stuff still in the buffer from a previous read, 324 * and there is more than we want, take some. */ 325 if (s->s2->rbuf_left >= (int)n) 326 { 327 if (extend) 328 s->packet_length+=n; 329 else 330 { 331 s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]); 332 s->packet_length=n; 333 } 334 s->s2->rbuf_left-=n; 335 s->s2->rbuf_offs+=n; 336 return(n); 337 } 338 339 if (!s->read_ahead) max=n; 340 if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) 341 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2; 342 343 344 /* Else we want more than we have. 345 * First, if there is some left or we want to extend */ 346 off=0; 347 if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend)) 348 { 349 newb=s->s2->rbuf_left; 350 if (extend) 351 { 352 off=s->packet_length; 353 if (s->packet != s->s2->rbuf) 354 memcpy(s->s2->rbuf,s->packet, 355 (unsigned int)newb+off); 356 } 357 else if (s->s2->rbuf_offs != 0) 358 { 359 memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]), 360 (unsigned int)newb); 361 s->s2->rbuf_offs=0; 362 } 363 s->s2->rbuf_left=0; 364 } 365 else 366 newb=0; 367 368 /* off is the offset to start writing too. 369 * r->s2->rbuf_offs is the 'unread data', now 0. 370 * newb is the number of new bytes so far 371 */ 372 s->packet=s->s2->rbuf; 373 while (newb < (int)n) 374 { 375 clear_sys_error(); 376 if (s->rbio != NULL) 377 { 378 s->rwstate=SSL_READING; 379 i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]), 380 max-newb); 381 } 382 else 383 { 384 SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET); 385 i= -1; 386 } 387#ifdef PKT_DEBUG 388 if (s->debug & 0x01) sleep(1); 389#endif 390 if (i <= 0) 391 { 392 s->s2->rbuf_left+=newb; 393 return(i); 394 } 395 newb+=i; 396 } 397 398 /* record unread data */ 399 if (newb > (int)n) 400 { 401 s->s2->rbuf_offs=n+off; 402 s->s2->rbuf_left=newb-n; 403 } 404 else 405 { 406 s->s2->rbuf_offs=0; 407 s->s2->rbuf_left=0; 408 } 409 if (extend) 410 s->packet_length+=n; 411 else 412 s->packet_length=n; 413 s->rwstate=SSL_NOTHING; 414 return(n); 415 } 416 417int ssl2_write(SSL *s, const void *_buf, int len) 418 { 419 const unsigned char *buf=_buf; 420 unsigned int n,tot; 421 int i; 422 423 if (SSL_in_init(s) && !s->in_handshake) 424 { 425 i=s->handshake_func(s); 426 if (i < 0) return(i); 427 if (i == 0) 428 { 429 SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE); 430 return(-1); 431 } 432 } 433 434 if (s->error) 435 { 436 ssl2_write_error(s); 437 if (s->error) 438 return(-1); 439 } 440 441 clear_sys_error(); 442 s->rwstate=SSL_NOTHING; 443 if (len <= 0) return(len); 444 445 tot=s->s2->wnum; 446 s->s2->wnum=0; 447 448 n=(len-tot); 449 for (;;) 450 { 451 i=n_do_ssl_write(s,&(buf[tot]),n); 452 if (i <= 0) 453 { 454 s->s2->wnum=tot; 455 return(i); 456 } 457 if ((i == (int)n) || 458 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)) 459 { 460 return(tot+i); 461 } 462 463 n-=i; 464 tot+=i; 465 } 466 } 467 468static int write_pending(SSL *s, const unsigned char *buf, unsigned int len) 469 { 470 int i; 471 472 /* s->s2->wpend_len != 0 MUST be true. */ 473 474 /* check that they have given us the same buffer to 475 * write */ 476 if ((s->s2->wpend_tot > (int)len) || 477 ((s->s2->wpend_buf != buf) && 478 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))) 479 { 480 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY); 481 return(-1); 482 } 483 484 for (;;) 485 { 486 clear_sys_error(); 487 if (s->wbio != NULL) 488 { 489 s->rwstate=SSL_WRITING; 490 i=BIO_write(s->wbio, 491 (char *)&(s->s2->write_ptr[s->s2->wpend_off]), 492 (unsigned int)s->s2->wpend_len); 493 } 494 else 495 { 496 SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET); 497 i= -1; 498 } 499#ifdef PKT_DEBUG 500 if (s->debug & 0x01) sleep(1); 501#endif 502 if (i == s->s2->wpend_len) 503 { 504 s->s2->wpend_len=0; 505 s->rwstate=SSL_NOTHING; 506 return(s->s2->wpend_ret); 507 } 508 else if (i <= 0) 509 return(i); 510 s->s2->wpend_off+=i; 511 s->s2->wpend_len-=i; 512 } 513 } 514 515static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len) 516 { 517 unsigned int j,k,olen,p,bs; 518 int mac_size; 519 register unsigned char *pp; 520 521 olen=len; 522 523 /* first check if there is data from an encryption waiting to 524 * be sent - it must be sent because the other end is waiting. 525 * This will happen with non-blocking IO. We print it and then 526 * return. 527 */ 528 if (s->s2->wpend_len != 0) return(write_pending(s,buf,len)); 529 530 /* set mac_size to mac size */ 531 if (s->s2->clear_text) 532 mac_size=0; 533 else 534 { 535 mac_size=EVP_MD_CTX_size(s->write_hash); 536 if (mac_size < 0) 537 return -1; 538 } 539 540 /* lets set the pad p */ 541 if (s->s2->clear_text) 542 { 543 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 544 len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 545 p=0; 546 s->s2->three_byte_header=0; 547 /* len=len; */ 548 } 549 else 550 { 551 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx); 552 j=len+mac_size; 553 /* Two-byte headers allow for a larger record length than 554 * three-byte headers, but we can't use them if we need 555 * padding or if we have to set the escape bit. */ 556 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) && 557 (!s->s2->escape)) 558 { 559 if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 560 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 561 /* set k to the max number of bytes with 2 562 * byte header */ 563 k=j-(j%bs); 564 /* how many data bytes? */ 565 len=k-mac_size; 566 s->s2->three_byte_header=0; 567 p=0; 568 } 569 else if ((bs <= 1) && (!s->s2->escape)) 570 { 571 /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus 572 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */ 573 s->s2->three_byte_header=0; 574 p=0; 575 } 576 else /* we may have to use a 3 byte header */ 577 { 578 /* If s->s2->escape is not set, then 579 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus 580 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */ 581 p=(j%bs); 582 p=(p == 0)?0:(bs-p); 583 if (s->s2->escape) 584 { 585 s->s2->three_byte_header=1; 586 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) 587 j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER; 588 } 589 else 590 s->s2->three_byte_header=(p == 0)?0:1; 591 } 592 } 593 594 /* Now 595 * j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER 596 * holds, and if s->s2->three_byte_header is set, then even 597 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER. 598 */ 599 600 /* mac_size is the number of MAC bytes 601 * len is the number of data bytes we are going to send 602 * p is the number of padding bytes 603 * (if it is a two-byte header, then p == 0) */ 604 605 s->s2->wlength=len; 606 s->s2->padding=p; 607 s->s2->mac_data= &(s->s2->wbuf[3]); 608 s->s2->wact_data= &(s->s2->wbuf[3+mac_size]); 609 /* we copy the data into s->s2->wbuf */ 610 memcpy(s->s2->wact_data,buf,len); 611 if (p) 612 memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */ 613 614 if (!s->s2->clear_text) 615 { 616 s->s2->wact_data_length=len+p; 617 ssl2_mac(s,s->s2->mac_data,1); 618 s->s2->wlength+=p+mac_size; 619 ssl2_enc(s,1); 620 } 621 622 /* package up the header */ 623 s->s2->wpend_len=s->s2->wlength; 624 if (s->s2->three_byte_header) /* 3 byte header */ 625 { 626 pp=s->s2->mac_data; 627 pp-=3; 628 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8); 629 if (s->s2->escape) pp[0]|=SEC_ESC_BIT; 630 pp[1]=s->s2->wlength&0xff; 631 pp[2]=s->s2->padding; 632 s->s2->wpend_len+=3; 633 } 634 else 635 { 636 pp=s->s2->mac_data; 637 pp-=2; 638 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT; 639 pp[1]=s->s2->wlength&0xff; 640 s->s2->wpend_len+=2; 641 } 642 s->s2->write_ptr=pp; 643 644 INC32(s->s2->write_sequence); /* expect next number */ 645 646 /* lets try to actually write the data */ 647 s->s2->wpend_tot=olen; 648 s->s2->wpend_buf=buf; 649 650 s->s2->wpend_ret=len; 651 652 s->s2->wpend_off=0; 653 return(write_pending(s,buf,olen)); 654 } 655 656int ssl2_part_read(SSL *s, unsigned long f, int i) 657 { 658 unsigned char *p; 659 int j; 660 661 if (i < 0) 662 { 663 /* ssl2_return_error(s); */ 664 /* for non-blocking io, 665 * this is not necessarily fatal */ 666 return(i); 667 } 668 else 669 { 670 s->init_num+=i; 671 672 /* Check for error. While there are recoverable errors, 673 * this function is not called when those must be expected; 674 * any error detected here is fatal. */ 675 if (s->init_num >= 3) 676 { 677 p=(unsigned char *)s->init_buf->data; 678 if (p[0] == SSL2_MT_ERROR) 679 { 680 j=(p[1]<<8)|p[2]; 681 SSLerr((int)f,ssl_mt_error(j)); 682 s->init_num -= 3; 683 if (s->init_num > 0) 684 memmove(p, p+3, s->init_num); 685 } 686 } 687 688 /* If it's not an error message, we have some error anyway -- 689 * the message was shorter than expected. This too is treated 690 * as fatal (at least if SSL_get_error is asked for its opinion). */ 691 return(0); 692 } 693 } 694 695int ssl2_do_write(SSL *s) 696 { 697 int ret; 698 699 ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num); 700 if (ret == s->init_num) 701 { 702 if (s->msg_callback) 703 s->msg_callback(1, s->version, 0, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg); 704 return(1); 705 } 706 if (ret < 0) 707 return(-1); 708 s->init_off+=ret; 709 s->init_num-=ret; 710 return(0); 711 } 712 713static int ssl_mt_error(int n) 714 { 715 int ret; 716 717 switch (n) 718 { 719 case SSL2_PE_NO_CIPHER: 720 ret=SSL_R_PEER_ERROR_NO_CIPHER; 721 break; 722 case SSL2_PE_NO_CERTIFICATE: 723 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE; 724 break; 725 case SSL2_PE_BAD_CERTIFICATE: 726 ret=SSL_R_PEER_ERROR_CERTIFICATE; 727 break; 728 case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE: 729 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE; 730 break; 731 default: 732 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE; 733 break; 734 } 735 return(ret); 736 } 737#else /* !OPENSSL_NO_SSL2 */ 738 739# if PEDANTIC 740static void *dummy=&dummy; 741# endif 742 743#endif 744