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if (dest_maxlen > 0)
{
/* XDTLS: In a pathalogical case, the Client Hello
* may be fragmented--don't always expect dest_maxlen bytes */
if ( rr->length < dest_maxlen)
{
#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
/*
* for normal alerts rr->length is 2, while
* dest_maxlen is 7 if we were to handle this
* non-existing alert...
*/
FIX ME
#endif
s->rstate=SSL_ST_READ_HEADER;
rr->length = 0;
goto start;
}
/* now move 'n' bytes: */
for ( k = 0; k < dest_maxlen; k++)
{
dest[k] = rr->data[rr->off++];
rr->length--;
}
*dest_len = dest_maxlen;
}
}
/* s->d1->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE;
* s->d1->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT.
* (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
/* If we are a client, check for an incoming 'Hello Request': */
if ((!s->server) &&
(s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
(s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
(s->session != NULL) && (s->session->cipher != NULL))
{
s->d1->handshake_fragment_len = 0;
if ((s->d1->handshake_fragment[1] != 0) ||
(s->d1->handshake_fragment[2] != 0) ||
(s->d1->handshake_fragment[3] != 0))
{
al=SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
goto err;
}
/* no need to check sequence number on HELLO REQUEST messages */
if (s->msg_callback)
s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
if (SSL_is_init_finished(s) &&
!(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
!s->s3->renegotiate)
{
s->d1->handshake_read_seq++;
s->new_session = 1;
ssl3_renegotiate(s);
if (ssl3_renegotiate_check(s))
{
i=s->handshake_func(s);
if (i < 0) return(i);
if (i == 0)
{
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
return(-1);
}
if (!(s->mode & SSL_MODE_AUTO_RETRY))
{
if (s->s3->rbuf.left == 0) /* no read-ahead left? */
{
BIO *bio;
/* In the case where we try to read application data,
* but we trigger an SSL handshake, we return -1 with
* the retry option set. Otherwise renegotiation may
* cause nasty problems in the blocking world */
s->rwstate=SSL_READING;
bio=SSL_get_rbio(s);
BIO_clear_retry_flags(bio);
BIO_set_retry_read(bio);
return(-1);
}
}
}
}
/* we either finished a handshake or ignored the request,
* now try again to obtain the (application) data we were asked for */
goto start;
}
if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
{
int alert_level = s->d1->alert_fragment[0];
int alert_descr = s->d1->alert_fragment[1];
s->d1->alert_fragment_len = 0;
if (s->msg_callback)
s->msg_callback(0, s->version, SSL3_RT_ALERT,
s->d1->alert_fragment, 2, s, s->msg_callback_arg);
if (s->info_callback != NULL)
cb=s->info_callback;
else if (s->ctx->info_callback != NULL)
cb=s->ctx->info_callback;
if (cb != NULL)
{
j = (alert_level << 8) | alert_descr;
cb(s, SSL_CB_READ_ALERT, j);
}
if (alert_level == 1) /* warning */
{
s->s3->warn_alert = alert_descr;
if (alert_descr == SSL_AD_CLOSE_NOTIFY)
{
#ifndef OPENSSL_NO_SCTP
/* With SCTP and streams the socket may deliver app data
* after a close_notify alert. We have to check this
* first so that nothing gets discarded.
*/
if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
{
s->d1->shutdown_received = 1;
s->rwstate=SSL_READING;
BIO_clear_retry_flags(SSL_get_rbio(s));
BIO_set_retry_read(SSL_get_rbio(s));
return -1;
}
#endif
s->shutdown |= SSL_RECEIVED_SHUTDOWN;
return(0);
}
#if 0
/* XXX: this is a possible improvement in the future */
/* now check if it's a missing record */
if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
{
unsigned short seq;
unsigned int frag_off;
unsigned char *p = &(s->d1->alert_fragment[2]);
n2s(p, seq);
n2l3(p, frag_off);
dtls1_retransmit_message(s,
dtls1_get_queue_priority(frag->msg_header.seq, 0),
frag_off, &found);
if ( ! found && SSL_in_init(s))
{
/* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
/* requested a message not yet sent,
send an alert ourselves */
ssl3_send_alert(s,SSL3_AL_WARNING,
DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
}
}
#endif
}
else if (alert_level == 2) /* fatal */
{
char tmp[16];
s->rwstate=SSL_NOTHING;
s->s3->fatal_alert = alert_descr;
SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
ERR_add_error_data(2,"SSL alert number ",tmp);
s->shutdown|=SSL_RECEIVED_SHUTDOWN;
SSL_CTX_remove_session(s->ctx,s->session);
return(0);
}
else
{
al=SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
goto f_err;
}
goto start;
}
if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
{
s->rwstate=SSL_NOTHING;
rr->length=0;
return(0);
}
if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
{
struct ccs_header_st ccs_hdr;
unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH;
dtls1_get_ccs_header(rr->data, &ccs_hdr);
if (s->version == DTLS1_BAD_VER)
ccs_hdr_len = 3;
/* 'Change Cipher Spec' is just a single byte, so we know
* exactly what the record payload has to look like */
/* XDTLS: check that epoch is consistent */
if ( (rr->length != ccs_hdr_len) ||
(rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
{
i=SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
goto err;
}
rr->length=0;
if (s->msg_callback)
s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
rr->data, 1, s, s->msg_callback_arg);
/* We can't process a CCS now, because previous handshake
* messages are still missing, so just drop it.
*/
if (!s->d1->change_cipher_spec_ok)
{
goto start;
}
s->d1->change_cipher_spec_ok = 0;
s->s3->change_cipher_spec=1;
if (!ssl3_do_change_cipher_spec(s))
goto err;
/* do this whenever CCS is processed */
dtls1_reset_seq_numbers(s, SSL3_CC_READ);
if (s->version == DTLS1_BAD_VER)
s->d1->handshake_read_seq++;
#ifndef OPENSSL_NO_SCTP
/* Remember that a CCS has been received,
* so that an old key of SCTP-Auth can be
* deleted when a CCS is sent. Will be ignored
* if no SCTP is used
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL);
#endif
goto start;
}
/* Unexpected handshake message (Client Hello, or protocol violation) */
if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
!s->in_handshake)
{
struct hm_header_st msg_hdr;
/* this may just be a stale retransmit */
dtls1_get_message_header(rr->data, &msg_hdr);
if( rr->epoch != s->d1->r_epoch)
{
rr->length = 0;
goto start;
}
/* If we are server, we may have a repeated FINISHED of the
* client here, then retransmit our CCS and FINISHED.
*/
if (msg_hdr.type == SSL3_MT_FINISHED)
{
if (dtls1_check_timeout_num(s) < 0)
return -1;
dtls1_retransmit_buffered_messages(s);
rr->length = 0;
goto start;
}
if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
!(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
{
#if 0 /* worked only because C operator preferences are not as expected (and
* because this is not really needed for clients except for detecting
* protocol violations): */
s->state=SSL_ST_BEFORE|(s->server)
?SSL_ST_ACCEPT
:SSL_ST_CONNECT;
#else
s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
#endif
s->renegotiate=1;
s->new_session=1;
}
i=s->handshake_func(s);
if (i < 0) return(i);
if (i == 0)
{
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
return(-1);
}
if (!(s->mode & SSL_MODE_AUTO_RETRY))
{
if (s->s3->rbuf.left == 0) /* no read-ahead left? */
{
BIO *bio;
/* In the case where we try to read application data,
* but we trigger an SSL handshake, we return -1 with
* the retry option set. Otherwise renegotiation may
* cause nasty problems in the blocking world */
s->rwstate=SSL_READING;
bio=SSL_get_rbio(s);
BIO_clear_retry_flags(bio);
BIO_set_retry_read(bio);
return(-1);
}
}
goto start;
}
switch (rr->type)
{
default:
#ifndef OPENSSL_NO_TLS
/* TLS just ignores unknown message types */
if (s->version == TLS1_VERSION)
{
rr->length = 0;
goto start;
}
#endif
al=SSL_AD_UNEXPECTED_MESSAGE;
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
goto f_err;
case SSL3_RT_CHANGE_CIPHER_SPEC:
case SSL3_RT_ALERT:
case SSL3_RT_HANDSHAKE:
/* we already handled all of these, with the possible exception
* of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
* should not happen when type != rr->type */
al=SSL_AD_UNEXPECTED_MESSAGE;
SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
goto f_err;
case SSL3_RT_APPLICATION_DATA:
/* At this point, we were expecting handshake data,
* but have application data. If the library was
* running inside ssl3_read() (i.e. in_read_app_data
* is set) and it makes sense to read application data
* at this point (session renegotiation not yet started),
* we will indulge it.
*/
if (s->s3->in_read_app_data &&
(s->s3->total_renegotiations != 0) &&
((
(s->state & SSL_ST_CONNECT) &&
(s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
(s->state <= SSL3_ST_CR_SRVR_HELLO_A)
) || (
(s->state & SSL_ST_ACCEPT) &&
(s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
(s->state >= SSL3_ST_SR_CLNT_HELLO_A)
)
))
{
s->s3->in_read_app_data=2;
return(-1);
}
else
{
al=SSL_AD_UNEXPECTED_MESSAGE;
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
goto f_err;
}
}
/* not reached */
f_err:
ssl3_send_alert(s,SSL3_AL_FATAL,al);
err:
return(-1);
}
int
dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
{
int i;
#ifndef OPENSSL_NO_SCTP
/* Check if we have to continue an interrupted handshake
* for reading belated app data with SCTP.
*/
if ((SSL_in_init(s) && !s->in_handshake) ||
(BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
(s->state == DTLS1_SCTP_ST_SR_READ_SOCK || s->state == DTLS1_SCTP_ST_CR_READ_SOCK)))
#else
if (SSL_in_init(s) && !s->in_handshake)
#endif
{
i=s->handshake_func(s);
if (i < 0) return(i);
if (i == 0)
{
SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
return -1;
}
}
if (len > SSL3_RT_MAX_PLAIN_LENGTH)
{
SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG);
return -1;
}
i = dtls1_write_bytes(s, type, buf_, len);
return i;
}
/* this only happens when a client hello is received and a handshake
* is started. */
static int
have_handshake_fragment(SSL *s, int type, unsigned char *buf,
int len, int peek)
{
if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
/* (partially) satisfy request from storage */
{
unsigned char *src = s->d1->handshake_fragment;
unsigned char *dst = buf;
unsigned int k,n;
/* peek == 0 */
n = 0;
while ((len > 0) && (s->d1->handshake_fragment_len > 0))
{
*dst++ = *src++;
len--; s->d1->handshake_fragment_len--;
n++;
}
/* move any remaining fragment bytes: */
for (k = 0; k < s->d1->handshake_fragment_len; k++)
s->d1->handshake_fragment[k] = *src++;
return n;
}
return 0;
}
/* Call this to write data in records of type 'type'
* It will return <= 0 if not all data has been sent or non-blocking IO.
*/
int dtls1_write_bytes(SSL *s, int type, const void *buf, int len)
{
int i;
OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
s->rwstate=SSL_NOTHING;
i=do_dtls1_write(s, type, buf, len, 0);
return i;
}
int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
{
unsigned char *p,*pseq;
int i,mac_size,clear=0;
int prefix_len = 0;
SSL3_RECORD *wr;
SSL3_BUFFER *wb;
SSL_SESSION *sess;
int bs;
/* first check if there is a SSL3_BUFFER still being written
* out. This will happen with non blocking IO */
if (s->s3->wbuf.left != 0)
{
OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */
return(ssl3_write_pending(s,type,buf,len));
}
/* If we have an alert to send, lets send it */
if (s->s3->alert_dispatch)
{
i=s->method->ssl_dispatch_alert(s);
if (i <= 0)
return(i);
/* if it went, fall through and send more stuff */
}
if (len == 0 && !create_empty_fragment)
return 0;
wr= &(s->s3->wrec);
wb= &(s->s3->wbuf);
sess=s->session;
if ( (sess == NULL) ||
(s->enc_write_ctx == NULL) ||
(EVP_MD_CTX_md(s->write_hash) == NULL))
clear=1;
if (clear)
mac_size=0;
else
{
mac_size=EVP_MD_CTX_size(s->write_hash);
if (mac_size < 0)
goto err;
}
/* DTLS implements explicit IV, so no need for empty fragments */
#if 0
/* 'create_empty_fragment' is true only when this function calls itself */
if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
&& SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
{
/* countermeasure against known-IV weakness in CBC ciphersuites
* (see http://www.openssl.org/~bodo/tls-cbc.txt)
*/
if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
{
/* recursive function call with 'create_empty_fragment' set;
* this prepares and buffers the data for an empty fragment
* (these 'prefix_len' bytes are sent out later
* together with the actual payload) */
prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
if (prefix_len <= 0)
goto err;
if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
{
/* insufficient space */
SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
goto err;
}
}
s->s3->empty_fragment_done = 1;
}
#endif
p = wb->buf + prefix_len;
/* write the header */
*(p++)=type&0xff;
wr->type=type;
*(p++)=(s->version>>8);
*(p++)=s->version&0xff;
/* field where we are to write out packet epoch, seq num and len */
pseq=p;
p+=10;
/* lets setup the record stuff. */
/* Make space for the explicit IV in case of CBC.
* (this is a bit of a boundary violation, but what the heck).
*/
if ( s->enc_write_ctx &&
(EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
else
bs = 0;
wr->data=p + bs; /* make room for IV in case of CBC */
wr->length=(int)len;
wr->input=(unsigned char *)buf;
/* we now 'read' from wr->input, wr->length bytes into
* wr->data */
/* first we compress */
if (s->compress != NULL)
{
if (!ssl3_do_compress(s))
{
SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
goto err;
}
}
else
{
memcpy(wr->data,wr->input,wr->length);
wr->input=wr->data;
}
/* we should still have the output to wr->data and the input
* from wr->input. Length should be wr->length.
* wr->data still points in the wb->buf */
if (mac_size != 0)
{
if(s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1) < 0)
goto err;
wr->length+=mac_size;
}
/* this is true regardless of mac size */
wr->input=p;
wr->data=p;
/* ssl3_enc can only have an error on read */
if (bs) /* bs != 0 in case of CBC */
{
RAND_pseudo_bytes(p,bs);
/* master IV and last CBC residue stand for
* the rest of randomness */
wr->length += bs;
}
s->method->ssl3_enc->enc(s,1);
/* record length after mac and block padding */
/* if (type == SSL3_RT_APPLICATION_DATA ||
(type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
/* there's only one epoch between handshake and app data */
s2n(s->d1->w_epoch, pseq);
/* XDTLS: ?? */
/* else
s2n(s->d1->handshake_epoch, pseq); */
memcpy(pseq, &(s->s3->write_sequence[2]), 6);
pseq+=6;
s2n(wr->length,pseq);
/* we should now have
* wr->data pointing to the encrypted data, which is
* wr->length long */
wr->type=type; /* not needed but helps for debugging */
wr->length+=DTLS1_RT_HEADER_LENGTH;
#if 0 /* this is now done at the message layer */
/* buffer the record, making it easy to handle retransmits */
if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
dtls1_buffer_record(s, wr->data, wr->length,
*((PQ_64BIT *)&(s->s3->write_sequence[0])));
#endif
ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
if (create_empty_fragment)
{
/* we are in a recursive call;
* just return the length, don't write out anything here
*/
return wr->length;
}
/* now let's set up wb */
wb->left = prefix_len + wr->length;
wb->offset = 0;
/* memorize arguments so that ssl3_write_pending can detect bad write retries later */
s->s3->wpend_tot=len;
s->s3->wpend_buf=buf;
s->s3->wpend_type=type;
s->s3->wpend_ret=len;
/* we now just need to write the buffer */
return ssl3_write_pending(s,type,buf,len);
err:
return -1;
}
static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap)
{
int cmp;
unsigned int shift;
const unsigned char *seq = s->s3->read_sequence;
cmp = satsub64be(seq,bitmap->max_seq_num);
if (cmp > 0)
{
memcpy (s->s3->rrec.seq_num,seq,8);
return 1; /* this record in new */
}
shift = -cmp;
if (shift >= sizeof(bitmap->map)*8)
return 0; /* stale, outside the window */
else if (bitmap->map & (1UL<<shift))
return 0; /* record previously received */
memcpy (s->s3->rrec.seq_num,seq,8);
return 1;
}
static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
{
int cmp;
unsigned int shift;
const unsigned char *seq = s->s3->read_sequence;
cmp = satsub64be(seq,bitmap->max_seq_num);
if (cmp > 0)
{
shift = cmp;
if (shift < sizeof(bitmap->map)*8)
bitmap->map <<= shift, bitmap->map |= 1UL;
else
bitmap->map = 1UL;
memcpy(bitmap->max_seq_num,seq,8);
}
else {
shift = -cmp;
if (shift < sizeof(bitmap->map)*8)
bitmap->map |= 1UL<<shift;
}
}
int dtls1_dispatch_alert(SSL *s)
{
int i,j;
void (*cb)(const SSL *ssl,int type,int val)=NULL;
unsigned char buf[DTLS1_AL_HEADER_LENGTH];
unsigned char *ptr = &buf[0];
s->s3->alert_dispatch=0;
memset(buf, 0x00, sizeof(buf));
*ptr++ = s->s3->send_alert[0];
*ptr++ = s->s3->send_alert[1];
#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
{
s2n(s->d1->handshake_read_seq, ptr);
#if 0
if ( s->d1->r_msg_hdr.frag_off == 0) /* waiting for a new msg */
else
s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
#endif
#if 0
fprintf(stderr, "s->d1->handshake_read_seq = %d, s->d1->r_msg_hdr.seq = %d\n",s->d1->handshake_read_seq,s->d1->r_msg_hdr.seq);
#endif
l2n3(s->d1->r_msg_hdr.frag_off, ptr);
}
#endif
i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
if (i <= 0)
{
s->s3->alert_dispatch=1;
/* fprintf( stderr, "not done with alert\n" ); */
}
else
{
if (s->s3->send_alert[0] == SSL3_AL_FATAL
#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
|| s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
#endif
)
(void)BIO_flush(s->wbio);
if (s->msg_callback)
s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
2, s, s->msg_callback_arg);
if (s->info_callback != NULL)
cb=s->info_callback;
else if (s->ctx->info_callback != NULL)
cb=s->ctx->info_callback;
if (cb != NULL)
{
j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
cb(s,SSL_CB_WRITE_ALERT,j);
}
}
return(i);
}
static DTLS1_BITMAP *
dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
{
*is_next_epoch = 0;
/* In current epoch, accept HM, CCS, DATA, & ALERT */
if (rr->epoch == s->d1->r_epoch)
return &s->d1->bitmap;
/* Only HM and ALERT messages can be from the next epoch */
else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
(rr->type == SSL3_RT_HANDSHAKE ||
rr->type == SSL3_RT_ALERT))
{
*is_next_epoch = 1;
return &s->d1->next_bitmap;
}
return NULL;
}
#if 0
static int
dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
unsigned long *offset)
{
/* alerts are passed up immediately */
if ( rr->type == SSL3_RT_APPLICATION_DATA ||
rr->type == SSL3_RT_ALERT)
return 0;
/* Only need to buffer if a handshake is underway.
* (this implies that Hello Request and Client Hello are passed up
* immediately) */
if ( SSL_in_init(s))
{
unsigned char *data = rr->data;
/* need to extract the HM/CCS sequence number here */
if ( rr->type == SSL3_RT_HANDSHAKE ||
rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
{
unsigned short seq_num;
struct hm_header_st msg_hdr;
struct ccs_header_st ccs_hdr;
if ( rr->type == SSL3_RT_HANDSHAKE)
{
dtls1_get_message_header(data, &msg_hdr);
seq_num = msg_hdr.seq;
*offset = msg_hdr.frag_off;
}
else
{
dtls1_get_ccs_header(data, &ccs_hdr);
seq_num = ccs_hdr.seq;
*offset = 0;
}
/* this is either a record we're waiting for, or a
* retransmit of something we happened to previously
* receive (higher layers will drop the repeat silently */
if ( seq_num < s->d1->handshake_read_seq)
return 0;
if (rr->type == SSL3_RT_HANDSHAKE &&
seq_num == s->d1->handshake_read_seq &&
msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
return 0;
else if ( seq_num == s->d1->handshake_read_seq &&
(rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
return 0;
else
{
*priority = seq_num;
return 1;
}
}
else /* unknown record type */
return 0;
}
return 0;
}
#endif
void
dtls1_reset_seq_numbers(SSL *s, int rw)
{
unsigned char *seq;
unsigned int seq_bytes = sizeof(s->s3->read_sequence);
if ( rw & SSL3_CC_READ)
{
seq = s->s3->read_sequence;
s->d1->r_epoch++;
memcpy(&(s->d1->bitmap), &(s->d1->next_bitmap), sizeof(DTLS1_BITMAP));
memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
}
else
{
seq = s->s3->write_sequence;
memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence));
s->d1->w_epoch++;
}
memset(seq, 0x00, seq_bytes);
}