if ((ss->enableSSL3 || ss->enableTLS) && !ss->firstHsDone) {  PORT_Assert( ssl_Have1stHandshakeLock(ss) );
if ((ss->opt.enableSSL3 || ss->opt.enableTLS) && !ss->firstHsDone) {  PORT_Assert( ss->opt.noLocks || ssl_Have1stHandshakeLock(ss) );
ssl2_GatherData(sslSocket *ss, sslGather *gs, int flags){    unsigned char *  bp;    unsigned char *  pBuf;    int              nb, err, rv;    PORT_Assert( ssl_HaveRecvBufLock(ss) );    if (gs->state == GS_INIT) {	/* Initialize gathering engine */	gs->state         = GS_HEADER;	gs->remainder     = 3;	gs->count         = 3;	gs->offset        = 0;	gs->recordLen     = 0;	gs->recordPadding = 0;	gs->hdr[2]        = 0;	gs->writeOffset   = 0;	gs->readOffset    = 0;    }    if (gs->encrypted) {	PORT_Assert(ss->sec.hash != 0);    }    pBuf = gs->buf.buf;    for (;;) {	SSL_TRC(30, ("%d: SSL[%d]: gather state %d (need %d more)",		     SSL_GETPID(), ss->fd, gs->state, gs->remainder));	bp = ((gs->state != GS_HEADER) ? pBuf : gs->hdr) + gs->offset;	nb = ssl_DefRecv(ss, bp, gs->remainder, flags);	if (nb > 0) {	    PRINT_BUF(60, (ss, "raw gather data:", bp, nb));	}	if (nb == 0) {	    /* EOF */	    SSL_TRC(30, ("%d: SSL[%d]: EOF", SSL_GETPID(), ss->fd));	    rv = 0;	    break;	}	if (nb < 0) {	    SSL_DBG(("%d: SSL[%d]: recv error %d", SSL_GETPID(), ss->fd,		     PR_GetError()));	    rv = SECFailure;	    break;	}	gs->offset    += nb;	gs->remainder -= nb;	if (gs->remainder > 0) {	    continue;	}	/* Probably finished this piece */	switch (gs->state) {	case GS_HEADER: 	    if ((ss->enableSSL3 || ss->enableTLS) && !ss->firstHsDone) {		PORT_Assert( ssl_Have1stHandshakeLock(ss) );		/* If this looks like an SSL3 handshake record, 		** and we're expecting an SSL2 Hello message from our peer, 		** handle it here.		*/		if (gs->hdr[0] == content_handshake) {		    if ((ss->nextHandshake == ssl2_HandleClientHelloMessage) ||			(ss->nextHandshake == ssl2_HandleServerHelloMessage)) {			rv = ssl2_HandleV3HandshakeRecord(ss);			if (rv == SECFailure) {			    return SECFailure;			}		    }		    /* XXX_1	The call stack to here is:		     * ssl_Do1stHandshake -> ssl_GatherRecord1stHandshake -> 		     *			ssl2_GatherRecord -> here.		     * We want to return all the way out to ssl_Do1stHandshake,		     * and have it call ssl_GatherRecord1stHandshake again. 		     * ssl_GatherRecord1stHandshake will call 		     * ssl3_GatherCompleteHandshake when it is called again.		     *		     * Returning SECWouldBlock here causes 		     * ssl_GatherRecord1stHandshake to return without clearing 		     * ss->handshake, ensuring that ssl_Do1stHandshake will 		     * call it again immediately.		     * 		     * If we return 1 here, ssl_GatherRecord1stHandshake will 		     * clear ss->handshake before returning, and thus will not 		     * be called again by ssl_Do1stHandshake.  		     */		    return SECWouldBlock;		} else if (gs->hdr[0] == content_alert) {		    if (ss->nextHandshake == ssl2_HandleServerHelloMessage) {			/* XXX This is a hack.  We're assuming that any failure			 * XXX on the client hello is a failure to match			 * XXX ciphers.			 */			PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);			return SECFailure;		    }		}	    }	/* ((ss->enableSSL3 || ss->enableTLS) && !ss->firstHsDone) */	    /* we've got the first 3 bytes.  The header may be two or three. */	    if (gs->hdr[0] & 0x80) {		/* This record has a 2-byte header, and no padding */		gs->count = ((gs->hdr[0] & 0x7f) << 8) | gs->hdr[1];		gs->recordPadding = 0;	    } else {		/* This record has a 3-byte header that is all read in now. */		gs->count = ((gs->hdr[0] & 0x3f) << 8) | gs->hdr[1];	    /*  is_escape =  (gs->hdr[0] & 0x40) != 0; */		gs->recordPadding = gs->hdr[2];	    }	    if (!gs->count) {		PORT_SetError(SSL_ERROR_RX_RECORD_TOO_LONG);		goto cleanup;	    }	    if (gs->count > gs->buf.space) {		err = sslBuffer_Grow(&gs->buf, gs->count);		if (err) {		    return err;		}		pBuf = gs->buf.buf;	    }	    if (gs->hdr[0] & 0x80) {	    	/* we've already read in the first byte of the body.		** Put it into the buffer.		*/		pBuf[0]        = gs->hdr[2];		gs->offset    = 1;		gs->remainder = gs->count - 1;	    } else {		gs->offset    = 0;		gs->remainder = gs->count;	    }	    if (gs->encrypted) {		gs->state     = GS_MAC;		gs->recordLen = gs->count - gs->recordPadding		                          - ss->sec.hash->length;	    } else {		gs->state     = GS_DATA;		gs->recordLen = gs->count;	    }	    break;	case GS_MAC:	    /* Have read in entire rest of the ciphertext.  	    ** Check for valid length.	    ** Decrypt it.	    ** Check the MAC.	    */	    PORT_Assert(gs->encrypted);	  {	    unsigned int     macLen;	    int              nout;	    unsigned char    mac[SSL_MAX_MAC_BYTES];	    ssl_GetSpecReadLock(ss); /**********************************/	    /* If this is a stream cipher, blockSize will be 1,	     * and this test will always be false.	     * If this is a block cipher, this will detect records	     * that are not a multiple of the blocksize in length.	     */	    if (gs->count & (ss->sec.blockSize - 1)) {		/* This is an error. Sender is misbehaving */		SSL_DBG(("%d: SSL[%d]: sender, count=%d blockSize=%d",			 SSL_GETPID(), ss->fd, gs->count,			 ss->sec.blockSize));		PORT_SetError(SSL_ERROR_BAD_BLOCK_PADDING);		rv = SECFailure;		goto spec_locked_done;	    }	    PORT_Assert(gs->count == gs->offset);	    if (gs->offset == 0) {		rv = 0;			/* means EOF. */		goto spec_locked_done;	    }	    /* Decrypt the portion of data that we just recieved.	    ** Decrypt it in place.	    */	    rv = (*ss->sec.dec)(ss->sec.readcx, pBuf, &nout, gs->offset,			     pBuf, gs->offset);	    if (rv != SECSuccess) {		goto spec_locked_done;	    }	    /* Have read in all the MAC portion of record 	    **	    ** Prepare MAC by resetting it and feeding it the shared secret	    */	    macLen = ss->sec.hash->length;	    if (gs->offset >= macLen) {		uint32           sequenceNumber = ss->sec.rcvSequence++;		unsigned char    seq[4];		seq[0] = (unsigned char) (sequenceNumber >> 24);		seq[1] = (unsigned char) (sequenceNumber >> 16);		seq[2] = (unsigned char) (sequenceNumber >> 8);		seq[3] = (unsigned char) (sequenceNumber);		(*ss->sec.hash->begin)(ss->sec.hashcx);		(*ss->sec.hash->update)(ss->sec.hashcx, ss->sec.rcvSecret.data,				        ss->sec.rcvSecret.len);		(*ss->sec.hash->update)(ss->sec.hashcx, pBuf + macLen, 				        gs->offset - macLen);		(*ss->sec.hash->update)(ss->sec.hashcx, seq, 4);		(*ss->sec.hash->end)(ss->sec.hashcx, mac, &macLen, macLen);	    }	    PORT_Assert(macLen == ss->sec.hash->length);	    ssl_ReleaseSpecReadLock(ss);  /******************************/	    if (PORT_Memcmp(mac, pBuf, macLen) != 0) {		/* MAC's didn't match... */		SSL_DBG(("%d: SSL[%d]: mac check failed, seq=%d",			 SSL_GETPID(), ss->fd, ss->sec.rcvSequence));		PRINT_BUF(1, (ss, "computed mac:", mac, macLen));		PRINT_BUF(1, (ss, "received mac:", pBuf, macLen));		PORT_SetError(SSL_ERROR_BAD_MAC_READ);		rv = SECFailure;		goto cleanup;	    }	    PORT_Assert(gs->recordPadding + macLen <= gs->offset);	    if (gs->recordPadding + macLen <= gs->offset) {		gs->recordOffset  = macLen;		gs->readOffset    = macLen;		gs->writeOffset   = gs->offset - gs->recordPadding;		rv = 1;	    } else {		PORT_SetError(SSL_ERROR_BAD_BLOCK_PADDING);cleanup:		/* nothing in the buffer any more. */		gs->recordOffset  = 0;		gs->readOffset    = 0;	    	gs->writeOffset   = 0;		rv = SECFailure;	    }	    gs->recordLen     = gs->writeOffset - gs->readOffset;	    gs->recordPadding = 0;	/* forget we did any padding. */	    gs->state = GS_INIT;	    if (rv > 0) {		PRINT_BUF(50, (ss, "recv clear record:", 		               pBuf + gs->recordOffset, gs->recordLen));	    }	    return rv;spec_locked_done:	    ssl_ReleaseSpecReadLock(ss);	    return rv;	  }	case GS_DATA:	    /* Have read in all the DATA portion of record */	    gs->recordOffset  = 0;	    gs->readOffset    = 0;	    gs->writeOffset   = gs->offset;	    PORT_Assert(gs->recordLen == gs->writeOffset - gs->readOffset);	    gs->recordLen     = gs->offset;	    gs->recordPadding = 0;	    gs->state         = GS_INIT;	    ++ss->sec.rcvSequence;	    PRINT_BUF(50, (ss, "recv clear record:", 	                   pBuf + gs->recordOffset, gs->recordLen));	    return 1;	}	/* end switch gs->state */    }		/* end gather loop. */    return rv;}