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 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 unsigned 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_size(s->read_hash); 250 OPENSSL_assert(mac_size <= MAX_MAC_SIZE); 251 s->s2->mac_data=p; 252 s->s2->ract_data= &p[mac_size]; 253 if (s->s2->padding + mac_size > s->s2->rlength) 254 { 255 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING); 256 return(-1); 257 } 258 } 259 260 s->s2->ract_data_length=s->s2->rlength; 261 /* added a check for length > max_size in case 262 * encryption was not turned on yet due to an error */ 263 if ((!s->s2->clear_text) && 264 (s->s2->rlength >= mac_size)) 265 { 266 ssl2_enc(s,0); 267 s->s2->ract_data_length-=mac_size; 268 ssl2_mac(s,mac,0); 269 s->s2->ract_data_length-=s->s2->padding; 270 if ( (CRYPTO_memcmp(mac,s->s2->mac_data,mac_size) != 0) || 271 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0)) 272 { 273 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE); 274 return(-1); 275 } 276 } 277 INC32(s->s2->read_sequence); /* expect next number */ 278 /* s->s2->ract_data is now available for processing */ 279 280 /* Possibly the packet that we just read had 0 actual data bytes. 281 * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.) 282 * In this case, returning 0 would be interpreted by the caller 283 * as indicating EOF, so it's not a good idea. Instead, we just 284 * continue reading; thus ssl2_read_internal may have to process 285 * multiple packets before it can return. 286 * 287 * [Note that using select() for blocking sockets *never* guarantees 288 * that the next SSL_read will not block -- the available 289 * data may contain incomplete packets, and except for SSL 2, 290 * renegotiation can confuse things even more.] */ 291 292 goto ssl2_read_again; /* This should really be 293 * "return ssl2_read(s,buf,len)", 294 * but that would allow for 295 * denial-of-service attacks if a 296 * C compiler is used that does not 297 * recognize end-recursion. */ 298 } 299 else 300 { 301 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE); 302 return(-1); 303 } 304 } 305 306int ssl2_read(SSL *s, void *buf, int len) 307 { 308 return ssl2_read_internal(s, buf, len, 0); 309 } 310 311int ssl2_peek(SSL *s, void *buf, int len) 312 { 313 return ssl2_read_internal(s, buf, len, 1); 314 } 315 316static int read_n(SSL *s, unsigned int n, unsigned int max, 317 unsigned int extend) 318 { 319 int i,off,newb; 320 321 /* if there is stuff still in the buffer from a previous read, 322 * and there is more than we want, take some. */ 323 if (s->s2->rbuf_left >= (int)n) 324 { 325 if (extend) 326 s->packet_length+=n; 327 else 328 { 329 s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]); 330 s->packet_length=n; 331 } 332 s->s2->rbuf_left-=n; 333 s->s2->rbuf_offs+=n; 334 return(n); 335 } 336 337 if (!s->read_ahead) max=n; 338 if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) 339 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2; 340 341 342 /* Else we want more than we have. 343 * First, if there is some left or we want to extend */ 344 off=0; 345 if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend)) 346 { 347 newb=s->s2->rbuf_left; 348 if (extend) 349 { 350 off=s->packet_length; 351 if (s->packet != s->s2->rbuf) 352 memcpy(s->s2->rbuf,s->packet, 353 (unsigned int)newb+off); 354 } 355 else if (s->s2->rbuf_offs != 0) 356 { 357 memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]), 358 (unsigned int)newb); 359 s->s2->rbuf_offs=0; 360 } 361 s->s2->rbuf_left=0; 362 } 363 else 364 newb=0; 365 366 /* off is the offset to start writing too. 367 * r->s2->rbuf_offs is the 'unread data', now 0. 368 * newb is the number of new bytes so far 369 */ 370 s->packet=s->s2->rbuf; 371 while (newb < (int)n) 372 { 373 clear_sys_error(); 374 if (s->rbio != NULL) 375 { 376 s->rwstate=SSL_READING; 377 i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]), 378 max-newb); 379 } 380 else 381 { 382 SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET); 383 i= -1; 384 } 385#ifdef PKT_DEBUG 386 if (s->debug & 0x01) sleep(1); 387#endif 388 if (i <= 0) 389 { 390 s->s2->rbuf_left+=newb; 391 return(i); 392 } 393 newb+=i; 394 } 395 396 /* record unread data */ 397 if (newb > (int)n) 398 { 399 s->s2->rbuf_offs=n+off; 400 s->s2->rbuf_left=newb-n; 401 } 402 else 403 { 404 s->s2->rbuf_offs=0; 405 s->s2->rbuf_left=0; 406 } 407 if (extend) 408 s->packet_length+=n; 409 else 410 s->packet_length=n; 411 s->rwstate=SSL_NOTHING; 412 return(n); 413 } 414 415int ssl2_write(SSL *s, const void *_buf, int len) 416 { 417 const unsigned char *buf=_buf; 418 unsigned int n,tot; 419 int i; 420 421 if (SSL_in_init(s) && !s->in_handshake) 422 { 423 i=s->handshake_func(s); 424 if (i < 0) return(i); 425 if (i == 0) 426 { 427 SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE); 428 return(-1); 429 } 430 } 431 432 if (s->error) 433 { 434 ssl2_write_error(s); 435 if (s->error) 436 return(-1); 437 } 438 439 clear_sys_error(); 440 s->rwstate=SSL_NOTHING; 441 if (len <= 0) return(len); 442 443 tot=s->s2->wnum; 444 s->s2->wnum=0; 445 446 n=(len-tot); 447 for (;;) 448 { 449 i=do_ssl_write(s,&(buf[tot]),n); 450 if (i <= 0) 451 { 452 s->s2->wnum=tot; 453 return(i); 454 } 455 if ((i == (int)n) || 456 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)) 457 { 458 return(tot+i); 459 } 460 461 n-=i; 462 tot+=i; 463 } 464 } 465 466static int write_pending(SSL *s, const unsigned char *buf, unsigned int len) 467 { 468 int i; 469 470 /* s->s2->wpend_len != 0 MUST be true. */ 471 472 /* check that they have given us the same buffer to 473 * write */ 474 if ((s->s2->wpend_tot > (int)len) || 475 ((s->s2->wpend_buf != buf) && 476 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))) 477 { 478 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY); 479 return(-1); 480 } 481 482 for (;;) 483 { 484 clear_sys_error(); 485 if (s->wbio != NULL) 486 { 487 s->rwstate=SSL_WRITING; 488 i=BIO_write(s->wbio, 489 (char *)&(s->s2->write_ptr[s->s2->wpend_off]), 490 (unsigned int)s->s2->wpend_len); 491 } 492 else 493 { 494 SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET); 495 i= -1; 496 } 497#ifdef PKT_DEBUG 498 if (s->debug & 0x01) sleep(1); 499#endif 500 if (i == s->s2->wpend_len) 501 { 502 s->s2->wpend_len=0; 503 s->rwstate=SSL_NOTHING; 504 return(s->s2->wpend_ret); 505 } 506 else if (i <= 0) 507 return(i); 508 s->s2->wpend_off+=i; 509 s->s2->wpend_len-=i; 510 } 511 } 512 513static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len) 514 { 515 unsigned int j,k,olen,p,mac_size,bs; 516 register unsigned char *pp; 517 518 olen=len; 519 520 /* first check if there is data from an encryption waiting to 521 * be sent - it must be sent because the other end is waiting. 522 * This will happen with non-blocking IO. We print it and then 523 * return. 524 */ 525 if (s->s2->wpend_len != 0) return(write_pending(s,buf,len)); 526 527 /* set mac_size to mac size */ 528 if (s->s2->clear_text) 529 mac_size=0; 530 else 531 mac_size=EVP_MD_size(s->write_hash); 532 533 /* lets set the pad p */ 534 if (s->s2->clear_text) 535 { 536 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 537 len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 538 p=0; 539 s->s2->three_byte_header=0; 540 /* len=len; */ 541 } 542 else 543 { 544 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx); 545 j=len+mac_size; 546 /* Two-byte headers allow for a larger record length than 547 * three-byte headers, but we can't use them if we need 548 * padding or if we have to set the escape bit. */ 549 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) && 550 (!s->s2->escape)) 551 { 552 if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 553 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 554 /* set k to the max number of bytes with 2 555 * byte header */ 556 k=j-(j%bs); 557 /* how many data bytes? */ 558 len=k-mac_size; 559 s->s2->three_byte_header=0; 560 p=0; 561 } 562 else if ((bs <= 1) && (!s->s2->escape)) 563 { 564 /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus 565 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */ 566 s->s2->three_byte_header=0; 567 p=0; 568 } 569 else /* we may have to use a 3 byte header */ 570 { 571 /* If s->s2->escape is not set, then 572 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus 573 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */ 574 p=(j%bs); 575 p=(p == 0)?0:(bs-p); 576 if (s->s2->escape) 577 { 578 s->s2->three_byte_header=1; 579 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) 580 j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER; 581 } 582 else 583 s->s2->three_byte_header=(p == 0)?0:1; 584 } 585 } 586 587 /* Now 588 * j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER 589 * holds, and if s->s2->three_byte_header is set, then even 590 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER. 591 */ 592 593 /* mac_size is the number of MAC bytes 594 * len is the number of data bytes we are going to send 595 * p is the number of padding bytes 596 * (if it is a two-byte header, then p == 0) */ 597 598 s->s2->wlength=len; 599 s->s2->padding=p; 600 s->s2->mac_data= &(s->s2->wbuf[3]); 601 s->s2->wact_data= &(s->s2->wbuf[3+mac_size]); 602 /* we copy the data into s->s2->wbuf */ 603 memcpy(s->s2->wact_data,buf,len); 604 if (p) 605 memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */ 606 607 if (!s->s2->clear_text) 608 { 609 s->s2->wact_data_length=len+p; 610 ssl2_mac(s,s->s2->mac_data,1); 611 s->s2->wlength+=p+mac_size; 612 ssl2_enc(s,1); 613 } 614 615 /* package up the header */ 616 s->s2->wpend_len=s->s2->wlength; 617 if (s->s2->three_byte_header) /* 3 byte header */ 618 { 619 pp=s->s2->mac_data; 620 pp-=3; 621 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8); 622 if (s->s2->escape) pp[0]|=SEC_ESC_BIT; 623 pp[1]=s->s2->wlength&0xff; 624 pp[2]=s->s2->padding; 625 s->s2->wpend_len+=3; 626 } 627 else 628 { 629 pp=s->s2->mac_data; 630 pp-=2; 631 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT; 632 pp[1]=s->s2->wlength&0xff; 633 s->s2->wpend_len+=2; 634 } 635 s->s2->write_ptr=pp; 636 637 INC32(s->s2->write_sequence); /* expect next number */ 638 639 /* lets try to actually write the data */ 640 s->s2->wpend_tot=olen; 641 s->s2->wpend_buf=buf; 642 643 s->s2->wpend_ret=len; 644 645 s->s2->wpend_off=0; 646 return(write_pending(s,buf,olen)); 647 } 648 649int ssl2_part_read(SSL *s, unsigned long f, int i) 650 { 651 unsigned char *p; 652 int j; 653 654 if (i < 0) 655 { 656 /* ssl2_return_error(s); */ 657 /* for non-blocking io, 658 * this is not necessarily fatal */ 659 return(i); 660 } 661 else 662 { 663 s->init_num+=i; 664 665 /* Check for error. While there are recoverable errors, 666 * this function is not called when those must be expected; 667 * any error detected here is fatal. */ 668 if (s->init_num >= 3) 669 { 670 p=(unsigned char *)s->init_buf->data; 671 if (p[0] == SSL2_MT_ERROR) 672 { 673 j=(p[1]<<8)|p[2]; 674 SSLerr((int)f,ssl_mt_error(j)); 675 s->init_num -= 3; 676 if (s->init_num > 0) 677 memmove(p, p+3, s->init_num); 678 } 679 } 680 681 /* If it's not an error message, we have some error anyway -- 682 * the message was shorter than expected. This too is treated 683 * as fatal (at least if SSL_get_error is asked for its opinion). */ 684 return(0); 685 } 686 } 687 688int ssl2_do_write(SSL *s) 689 { 690 int ret; 691 692 ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num); 693 if (ret == s->init_num) 694 { 695 if (s->msg_callback) 696 s->msg_callback(1, s->version, 0, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg); 697 return(1); 698 } 699 if (ret < 0) 700 return(-1); 701 s->init_off+=ret; 702 s->init_num-=ret; 703 return(0); 704 } 705 706static int ssl_mt_error(int n) 707 { 708 int ret; 709 710 switch (n) 711 { 712 case SSL2_PE_NO_CIPHER: 713 ret=SSL_R_PEER_ERROR_NO_CIPHER; 714 break; 715 case SSL2_PE_NO_CERTIFICATE: 716 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE; 717 break; 718 case SSL2_PE_BAD_CERTIFICATE: 719 ret=SSL_R_PEER_ERROR_CERTIFICATE; 720 break; 721 case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE: 722 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE; 723 break; 724 default: 725 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE; 726 break; 727 } 728 return(ret); 729 } 730#else /* !OPENSSL_NO_SSL2 */ 731 732# if PEDANTIC 733static void *dummy=&dummy; 734# endif 735 736#endif 737