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240 lines
7.4 KiB
C
240 lines
7.4 KiB
C
/*
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* Gather (Read) entire SSL3 records from socket into buffer.
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1994-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* $Id: ssl3gthr.c,v 1.9 2008/11/20 07:37:25 nelson%bolyard.com Exp $ */
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#include "cert.h"
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#include "ssl.h"
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#include "sslimpl.h"
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#include "ssl3prot.h"
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/*
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* Attempt to read in an entire SSL3 record.
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* Blocks here for blocking sockets, otherwise returns -1 with
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* PR_WOULD_BLOCK_ERROR when socket would block.
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*
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* returns 1 if received a complete SSL3 record.
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* returns 0 if recv returns EOF
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* returns -1 if recv returns <0
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* (The error value may have already been set to PR_WOULD_BLOCK_ERROR)
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*
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* Caller must hold the recv buf lock.
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*
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* The Gather state machine has 3 states: GS_INIT, GS_HEADER, GS_DATA.
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* GS_HEADER: waiting for the 5-byte SSL3 record header to come in.
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* GS_DATA: waiting for the body of the SSL3 record to come in.
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*
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* This loop returns when either (a) an error or EOF occurs,
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* (b) PR_WOULD_BLOCK_ERROR,
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* (c) data (entire SSL3 record) has been received.
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*/
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static int
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ssl3_GatherData(sslSocket *ss, sslGather *gs, int flags)
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{
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unsigned char *bp;
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unsigned char *lbp;
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int nb;
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int err;
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int rv = 1;
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PORT_Assert( ss->opt.noLocks || ssl_HaveRecvBufLock(ss) );
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if (gs->state == GS_INIT) {
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gs->state = GS_HEADER;
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gs->remainder = 5;
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gs->offset = 0;
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gs->writeOffset = 0;
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gs->readOffset = 0;
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gs->inbuf.len = 0;
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}
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lbp = gs->inbuf.buf;
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for(;;) {
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SSL_TRC(30, ("%d: SSL3[%d]: gather state %d (need %d more)",
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SSL_GETPID(), ss->fd, gs->state, gs->remainder));
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bp = ((gs->state != GS_HEADER) ? lbp : gs->hdr) + gs->offset;
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nb = ssl_DefRecv(ss, bp, gs->remainder, flags);
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if (nb > 0) {
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PRINT_BUF(60, (ss, "raw gather data:", bp, nb));
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} else if (nb == 0) {
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/* EOF */
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SSL_TRC(30, ("%d: SSL3[%d]: EOF", SSL_GETPID(), ss->fd));
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rv = 0;
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break;
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} else /* if (nb < 0) */ {
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SSL_DBG(("%d: SSL3[%d]: recv error %d", SSL_GETPID(), ss->fd,
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PR_GetError()));
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rv = SECFailure;
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break;
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}
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PORT_Assert( nb <= gs->remainder );
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if (nb > gs->remainder) {
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/* ssl_DefRecv is misbehaving! this error is fatal to SSL. */
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gs->state = GS_INIT; /* so we don't crash next time */
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rv = SECFailure;
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break;
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}
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gs->offset += nb;
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gs->remainder -= nb;
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if (gs->state == GS_DATA)
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gs->inbuf.len += nb;
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/* if there's more to go, read some more. */
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if (gs->remainder > 0) {
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continue;
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}
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/* have received entire record header, or entire record. */
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switch (gs->state) {
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case GS_HEADER:
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/*
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** Have received SSL3 record header in gs->hdr.
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** Now extract the length of the following encrypted data,
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** and then read in the rest of the SSL3 record into gs->inbuf.
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*/
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gs->remainder = (gs->hdr[3] << 8) | gs->hdr[4];
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/* This is the max fragment length for an encrypted fragment
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** plus the size of the record header.
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*/
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if(gs->remainder > (MAX_FRAGMENT_LENGTH + 2048 + 5)) {
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SSL3_SendAlert(ss, alert_fatal, unexpected_message);
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gs->state = GS_INIT;
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PORT_SetError(SSL_ERROR_RX_RECORD_TOO_LONG);
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return SECFailure;
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}
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gs->state = GS_DATA;
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gs->offset = 0;
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gs->inbuf.len = 0;
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if (gs->remainder > gs->inbuf.space) {
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err = sslBuffer_Grow(&gs->inbuf, gs->remainder);
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if (err) { /* realloc has set error code to no mem. */
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return err;
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}
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lbp = gs->inbuf.buf;
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}
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break; /* End this case. Continue around the loop. */
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case GS_DATA:
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/*
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** SSL3 record has been completely received.
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*/
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gs->state = GS_INIT;
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return 1;
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}
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}
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return rv;
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}
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/* Gather in a record and when complete, Handle that record.
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* Repeat this until the handshake is complete,
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* or until application data is available.
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*
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* Returns 1 when the handshake is completed without error, or
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* application data is available.
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* Returns 0 if ssl3_GatherData hits EOF.
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* Returns -1 on read error, or PR_WOULD_BLOCK_ERROR, or handleRecord error.
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* Returns -2 on SECWouldBlock return from ssl3_HandleRecord.
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*
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* Called from ssl_GatherRecord1stHandshake in sslcon.c,
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* and from SSL_ForceHandshake in sslsecur.c
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* and from ssl3_GatherAppDataRecord below (<- DoRecv in sslsecur.c).
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*
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* Caller must hold the recv buf lock.
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*/
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int
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ssl3_GatherCompleteHandshake(sslSocket *ss, int flags)
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{
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SSL3Ciphertext cText;
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int rv;
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PORT_Assert( ss->opt.noLocks || ssl_HaveRecvBufLock(ss) );
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do {
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/* bring in the next sslv3 record. */
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rv = ssl3_GatherData(ss, &ss->gs, flags);
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if (rv <= 0) {
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return rv;
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}
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/* decipher it, and handle it if it's a handshake.
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* If it's application data, ss->gs.buf will not be empty upon return.
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*/
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cText.type = (SSL3ContentType)ss->gs.hdr[0];
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cText.version = (ss->gs.hdr[1] << 8) | ss->gs.hdr[2];
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cText.buf = &ss->gs.inbuf;
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rv = ssl3_HandleRecord(ss, &cText, &ss->gs.buf);
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if (rv < 0) {
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return ss->recvdCloseNotify ? 0 : rv;
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}
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} while (ss->ssl3.hs.ws != idle_handshake && ss->gs.buf.len == 0);
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ss->gs.readOffset = 0;
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ss->gs.writeOffset = ss->gs.buf.len;
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return 1;
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}
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/* Repeatedly gather in a record and when complete, Handle that record.
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* Repeat this until some application data is received.
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*
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* Returns 1 when application data is available.
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* Returns 0 if ssl3_GatherData hits EOF.
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* Returns -1 on read error, or PR_WOULD_BLOCK_ERROR, or handleRecord error.
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* Returns -2 on SECWouldBlock return from ssl3_HandleRecord.
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*
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* Called from DoRecv in sslsecur.c
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* Caller must hold the recv buf lock.
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*/
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int
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ssl3_GatherAppDataRecord(sslSocket *ss, int flags)
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{
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int rv;
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PORT_Assert( ss->opt.noLocks || ssl_HaveRecvBufLock(ss) );
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do {
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rv = ssl3_GatherCompleteHandshake(ss, flags);
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} while (rv > 0 && ss->gs.buf.len == 0);
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return rv;
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}
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