ssl/s2_pkt.c

   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) 1998-2000 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
 118 static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend);
 119 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len);
 120 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len);
 121 static 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  */
 127 static 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                         s->s2->mac_data=p;
 251                         s->s2->ract_data= &p[mac_size];
 252                         if (s->s2->padding + mac_size > s->s2->rlength)
 253                                 {
 254                                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING);
 255                                 return(-1);
 256                                 }
 257                         }
 258
 259                 s->s2->ract_data_length=s->s2->rlength;
 260                 /* added a check for length > max_size in case
 261                  * encryption was not turned on yet due to an error */
 262                 if ((!s->s2->clear_text) &&
 263                         (s->s2->rlength >= mac_size))
 264                         {
 265                         ssl2_enc(s,0);
 266                         s->s2->ract_data_length-=mac_size;
 267                         ssl2_mac(s,mac,0);
 268                         s->s2->ract_data_length-=s->s2->padding;
 269                         if (    (memcmp(mac,s->s2->mac_data,
 270                                 (unsigned int)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
 306 int ssl2_read(SSL *s, void *buf, int len)
 307         {
 308         return ssl2_read_internal(s, buf, len, 0);
 309         }
 310
 311 int ssl2_peek(SSL *s, void *buf, int len)
 312         {
 313         return ssl2_read_internal(s, buf, len, 1);
 314         }
 315
 316 static 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
 415 int 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
 466 static 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
 513 static 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
 649 int ssl2_part_read(SSL *s, unsigned long f, int i)
 650         {
 651         unsigned char *p;
 652         int j;
 653
 654         /* check for error */
 655         if ((s->init_num == 0) && (i >= 3))
 656                 {
 657                 p=(unsigned char *)s->init_buf->data;
 658                 if (p[0] == SSL2_MT_ERROR)
 659                         {
 660                         j=(p[1]<<8)|p[2];
 661                         SSLerr((int)f,ssl_mt_error(j));
 662                         }
 663                 }
 664
 665         if (i < 0)
 666                 {
 667                 /* ssl2_return_error(s); */
 668                 /* for non-blocking io,
 669                  * this is not fatal */
 670                 return(i);
 671                 }
 672         else
 673                 {
 674                 s->init_num+=i;
 675                 return(0);
 676                 }
 677         }
 678
 679 int ssl2_do_write(SSL *s)
 680         {
 681         int ret;
 682
 683         ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);
 684         if (ret == s->init_num)
 685                 return(1);
 686         if (ret < 0)
 687                 return(-1);
 688         s->init_off+=ret;
 689         s->init_num-=ret;
 690         return(0);
 691         }
 692
 693 static int ssl_mt_error(int n)
 694         {
 695         int ret;
 696
 697         switch (n)
 698                 {
 699         case SSL2_PE_NO_CIPHER:
 700                 ret=SSL_R_PEER_ERROR_NO_CIPHER;
 701                 break;
 702         case SSL2_PE_NO_CERTIFICATE:
 703                 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
 704                 break;
 705         case SSL2_PE_BAD_CERTIFICATE:
 706                 ret=SSL_R_PEER_ERROR_CERTIFICATE;
 707                 break;
 708         case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
 709                 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
 710                 break;
 711         default:
 712                 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;
 713                 break;
 714                 }
 715         return(ret);
 716         }
 717 #else /* !OPENSSL_NO_SSL2 */
 718
 719 # if PEDANTIC
 720 static void *dummy=&dummy;
 721 # endif
 722
 723 #endif