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 n_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 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
308 int ssl2_read(SSL *s, void *buf, int len)
309 {
310 return ssl2_read_internal(s, buf, len, 0);
311 }
312
313 int ssl2_peek(SSL *s, void *buf, int len)
314 {
315 return ssl2_read_internal(s, buf, len, 1);
316 }
317
318 static 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
417 int 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
468 static 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
515 static 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
656 int 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
695 int 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
713 static 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
740 static void *dummy=&dummy;
741 # endif
742
743 #endif