Further BUILDENV refinement, further fool-proofing of Makefiles and
[openssl.git] / 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) 1998-2001 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
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                         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 (    (memcmp(mac,s->s2->mac_data,
271                                 (unsigned int)mac_size) != 0) ||
272                                 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
273                                 {
274                                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE);
275                                 return(-1);
276                                 }
277                         }
278                 INC32(s->s2->read_sequence); /* expect next number */
279                 /* s->s2->ract_data is now available for processing */
280
281                 /* Possibly the packet that we just read had 0 actual data bytes.
282                  * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.)
283                  * In this case, returning 0 would be interpreted by the caller
284                  * as indicating EOF, so it's not a good idea.  Instead, we just
285                  * continue reading; thus ssl2_read_internal may have to process
286                  * multiple packets before it can return.
287                  *
288                  * [Note that using select() for blocking sockets *never* guarantees
289                  * that the next SSL_read will not block -- the available
290                  * data may contain incomplete packets, and except for SSL 2,
291                  * renegotiation can confuse things even more.] */
292
293                 goto ssl2_read_again; /* This should really be
294                                        * "return ssl2_read(s,buf,len)",
295                                        * but that would allow for
296                                        * denial-of-service attacks if a
297                                        * C compiler is used that does not
298                                        * recognize end-recursion. */
299                 }
300         else
301                 {
302                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE);
303                         return(-1);
304                 }
305         }
306
307 int ssl2_read(SSL *s, void *buf, int len)
308         {
309         return ssl2_read_internal(s, buf, len, 0);
310         }
311
312 int ssl2_peek(SSL *s, void *buf, int len)
313         {
314         return ssl2_read_internal(s, buf, len, 1);
315         }
316
317 static int read_n(SSL *s, unsigned int n, unsigned int max,
318              unsigned int extend)
319         {
320         int i,off,newb;
321
322         /* if there is stuff still in the buffer from a previous read,
323          * and there is more than we want, take some. */
324         if (s->s2->rbuf_left >= (int)n)
325                 {
326                 if (extend)
327                         s->packet_length+=n;
328                 else
329                         {
330                         s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
331                         s->packet_length=n;
332                         }
333                 s->s2->rbuf_left-=n;
334                 s->s2->rbuf_offs+=n;
335                 return(n);
336                 }
337
338         if (!s->read_ahead) max=n;
339         if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
340                 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
341         
342
343         /* Else we want more than we have.
344          * First, if there is some left or we want to extend */
345         off=0;
346         if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
347                 {
348                 newb=s->s2->rbuf_left;
349                 if (extend)
350                         {
351                         off=s->packet_length;
352                         if (s->packet != s->s2->rbuf)
353                                 memcpy(s->s2->rbuf,s->packet,
354                                         (unsigned int)newb+off);
355                         }
356                 else if (s->s2->rbuf_offs != 0)
357                         {
358                         memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
359                                 (unsigned int)newb);
360                         s->s2->rbuf_offs=0;
361                         }
362                 s->s2->rbuf_left=0;
363                 }
364         else
365                 newb=0;
366
367         /* off is the offset to start writing too.
368          * r->s2->rbuf_offs is the 'unread data', now 0. 
369          * newb is the number of new bytes so far
370          */
371         s->packet=s->s2->rbuf;
372         while (newb < (int)n)
373                 {
374                 clear_sys_error();
375                 if (s->rbio != NULL)
376                         {
377                         s->rwstate=SSL_READING;
378                         i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
379                                 max-newb);
380                         }
381                 else
382                         {
383                         SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
384                         i= -1;
385                         }
386 #ifdef PKT_DEBUG
387                 if (s->debug & 0x01) sleep(1);
388 #endif
389                 if (i <= 0)
390                         {
391                         s->s2->rbuf_left+=newb;
392                         return(i);
393                         }
394                 newb+=i;
395                 }
396
397         /* record unread data */
398         if (newb > (int)n)
399                 {
400                 s->s2->rbuf_offs=n+off;
401                 s->s2->rbuf_left=newb-n;
402                 }
403         else
404                 {
405                 s->s2->rbuf_offs=0;
406                 s->s2->rbuf_left=0;
407                 }
408         if (extend)
409                 s->packet_length+=n;
410         else
411                 s->packet_length=n;
412         s->rwstate=SSL_NOTHING;
413         return(n);
414         }
415
416 int ssl2_write(SSL *s, const void *_buf, int len)
417         {
418         const unsigned char *buf=_buf;
419         unsigned int n,tot;
420         int i;
421
422         if (SSL_in_init(s) && !s->in_handshake)
423                 {
424                 i=s->handshake_func(s);
425                 if (i < 0) return(i);
426                 if (i == 0)
427                         {
428                         SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
429                         return(-1);
430                         }
431                 }
432
433         if (s->error)
434                 {
435                 ssl2_write_error(s);
436                 if (s->error)
437                         return(-1);
438                 }
439
440         clear_sys_error();
441         s->rwstate=SSL_NOTHING;
442         if (len <= 0) return(len);
443
444         tot=s->s2->wnum;
445         s->s2->wnum=0;
446
447         n=(len-tot);
448         for (;;)
449                 {
450                 i=do_ssl_write(s,&(buf[tot]),n);
451                 if (i <= 0)
452                         {
453                         s->s2->wnum=tot;
454                         return(i);
455                         }
456                 if ((i == (int)n) ||
457                         (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))
458                         {
459                         return(tot+i);
460                         }
461                 
462                 n-=i;
463                 tot+=i;
464                 }
465         }
466
467 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len)
468         {
469         int i;
470
471         /* s->s2->wpend_len != 0 MUST be true. */
472
473         /* check that they have given us the same buffer to
474          * write */
475         if ((s->s2->wpend_tot > (int)len) ||
476                 ((s->s2->wpend_buf != buf) &&
477                  !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)))
478                 {
479                 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
480                 return(-1);
481                 }
482
483         for (;;)
484                 {
485                 clear_sys_error();
486                 if (s->wbio != NULL)
487                         {
488                         s->rwstate=SSL_WRITING;
489                         i=BIO_write(s->wbio,
490                                 (char *)&(s->s2->write_ptr[s->s2->wpend_off]),
491                                 (unsigned int)s->s2->wpend_len);
492                         }
493                 else
494                         {
495                         SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
496                         i= -1;
497                         }
498 #ifdef PKT_DEBUG
499                 if (s->debug & 0x01) sleep(1);
500 #endif
501                 if (i == s->s2->wpend_len)
502                         {
503                         s->s2->wpend_len=0;
504                         s->rwstate=SSL_NOTHING;
505                         return(s->s2->wpend_ret);
506                         }
507                 else if (i <= 0)
508                         return(i);
509                 s->s2->wpend_off+=i;
510                 s->s2->wpend_len-=i;
511                 }
512         }
513
514 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)
515         {
516         unsigned int j,k,olen,p,mac_size,bs;
517         register unsigned char *pp;
518
519         olen=len;
520
521         /* first check if there is data from an encryption waiting to
522          * be sent - it must be sent because the other end is waiting.
523          * This will happen with non-blocking IO.  We print it and then
524          * return.
525          */
526         if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
527
528         /* set mac_size to mac size */
529         if (s->s2->clear_text)
530                 mac_size=0;
531         else
532                 mac_size=EVP_MD_size(s->write_hash);
533
534         /* lets set the pad p */
535         if (s->s2->clear_text)
536                 {
537                 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
538                         len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
539                 p=0;
540                 s->s2->three_byte_header=0;
541                 /* len=len; */
542                 }
543         else
544                 {
545                 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
546                 j=len+mac_size;
547                 /* Two-byte headers allow for a larger record length than
548                  * three-byte headers, but we can't use them if we need
549                  * padding or if we have to set the escape bit. */
550                 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
551                         (!s->s2->escape))
552                         {
553                         if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
554                                 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
555                         /* set k to the max number of bytes with 2
556                          * byte header */
557                         k=j-(j%bs);
558                         /* how many data bytes? */
559                         len=k-mac_size; 
560                         s->s2->three_byte_header=0;
561                         p=0;
562                         }
563                 else if ((bs <= 1) && (!s->s2->escape))
564                         {
565                         /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus
566                          * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */
567                         s->s2->three_byte_header=0;
568                         p=0;
569                         }
570                 else /* we may have to use a 3 byte header */
571                         {
572                         /* If s->s2->escape is not set, then
573                          * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus
574                          * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */
575                         p=(j%bs);
576                         p=(p == 0)?0:(bs-p);
577                         if (s->s2->escape)
578                                 {
579                                 s->s2->three_byte_header=1;
580                                 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
581                                         j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER;
582                                 }
583                         else
584                                 s->s2->three_byte_header=(p == 0)?0:1;
585                         }
586                 }
587
588         /* Now
589          *      j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER
590          * holds, and if s->s2->three_byte_header is set, then even
591          *      j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER.
592          */
593
594         /* mac_size is the number of MAC bytes
595          * len is the number of data bytes we are going to send
596          * p is the number of padding bytes
597          * (if it is a two-byte header, then p == 0) */
598
599         s->s2->wlength=len;
600         s->s2->padding=p;
601         s->s2->mac_data= &(s->s2->wbuf[3]);
602         s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);
603         /* we copy the data into s->s2->wbuf */
604         memcpy(s->s2->wact_data,buf,len);
605         if (p)
606                 memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */
607
608         if (!s->s2->clear_text)
609                 {
610                 s->s2->wact_data_length=len+p;
611                 ssl2_mac(s,s->s2->mac_data,1);
612                 s->s2->wlength+=p+mac_size;
613                 ssl2_enc(s,1);
614                 }
615
616         /* package up the header */
617         s->s2->wpend_len=s->s2->wlength;
618         if (s->s2->three_byte_header) /* 3 byte header */
619                 {
620                 pp=s->s2->mac_data;
621                 pp-=3;
622                 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);
623                 if (s->s2->escape) pp[0]|=SEC_ESC_BIT;
624                 pp[1]=s->s2->wlength&0xff;
625                 pp[2]=s->s2->padding;
626                 s->s2->wpend_len+=3;
627                 }
628         else
629                 {
630                 pp=s->s2->mac_data;
631                 pp-=2;
632                 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;
633                 pp[1]=s->s2->wlength&0xff;
634                 s->s2->wpend_len+=2;
635                 }
636         s->s2->write_ptr=pp;
637         
638         INC32(s->s2->write_sequence); /* expect next number */
639
640         /* lets try to actually write the data */
641         s->s2->wpend_tot=olen;
642         s->s2->wpend_buf=buf;
643
644         s->s2->wpend_ret=len;
645
646         s->s2->wpend_off=0;
647         return(write_pending(s,buf,olen));
648         }
649
650 int ssl2_part_read(SSL *s, unsigned long f, int i)
651         {
652         unsigned char *p;
653         int j;
654
655         if (i < 0)
656                 {
657                 /* ssl2_return_error(s); */
658                 /* for non-blocking io,
659                  * this is not necessarily fatal */
660                 return(i);
661                 }
662         else
663                 {
664                 s->init_num+=i;
665
666                 /* Check for error.  While there are recoverable errors,
667                  * this function is not called when those must be expected;
668                  * any error detected here is fatal. */
669                 if (s->init_num >= 3)
670                         {
671                         p=(unsigned char *)s->init_buf->data;
672                         if (p[0] == SSL2_MT_ERROR)
673                                 {
674                                 j=(p[1]<<8)|p[2];
675                                 SSLerr((int)f,ssl_mt_error(j));
676                                 s->init_num -= 3;
677                                 if (s->init_num > 0)
678                                         memmove(p, p+3, s->init_num);
679                                 }
680                         }
681
682                 /* If it's not an error message, we have some error anyway --
683                  * the message was shorter than expected.  This too is treated
684                  * as fatal (at least if SSL_get_error is asked for its opinion). */
685                 return(0);
686                 }
687         }
688
689 int ssl2_do_write(SSL *s)
690         {
691         int ret;
692
693         ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);
694         if (ret == s->init_num)
695                 {
696                 if (s->msg_callback)
697                         s->msg_callback(1, s->version, 0, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg);
698                 return(1);
699                 }
700         if (ret < 0)
701                 return(-1);
702         s->init_off+=ret;
703         s->init_num-=ret;
704         return(0);
705         }
706
707 static int ssl_mt_error(int n)
708         {
709         int ret;
710
711         switch (n)
712                 {
713         case SSL2_PE_NO_CIPHER:
714                 ret=SSL_R_PEER_ERROR_NO_CIPHER;
715                 break;
716         case SSL2_PE_NO_CERTIFICATE:
717                 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
718                 break;
719         case SSL2_PE_BAD_CERTIFICATE:
720                 ret=SSL_R_PEER_ERROR_CERTIFICATE;
721                 break;
722         case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
723                 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
724                 break;
725         default:
726                 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;
727                 break;
728                 }
729         return(ret);
730         }
731 #else /* !OPENSSL_NO_SSL2 */
732
733 # if PEDANTIC
734 static void *dummy=&dummy;
735 # endif
736
737 #endif