Add DTLS support to NSS, contributed by Eric Rescorla.

net/third_party/nss/ssl/sslgathr.c

 /*
  * Gather (Read) entire SSL2 records from socket into buffer.  
  *
  * ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
@@ skipping 416 matching lines @@
 
 /* Caller should hold RecvBufLock. */
 SECStatus
 ssl_InitGather(sslGather *gs)
 {
     SECStatus status;
 
     gs->state = GS_INIT;
     gs->writeOffset = 0;
     gs->readOffset  = 0;
+    gs->dtlsPacketOffset = 0;
+    gs->dtlsPacket.len = 0;
     status = sslBuffer_Grow(&gs->buf, 4096);
     return status;
 }
 
 /* Caller must hold RecvBufLock. */
 void 
 ssl_DestroyGather(sslGather *gs)
 {
     if (gs) {   /* the PORT_*Free functions check for NULL pointers. */
         PORT_ZFree(gs->buf.buf, gs->buf.space);
         PORT_Free(gs->inbuf.buf);
+        PORT_Free(gs->dtlsPacket.buf);
     }
 }
 
 /* Caller must hold RecvBufLock. */
 static SECStatus
 ssl2_HandleV3HandshakeRecord(sslSocket *ss)
 {
     SECStatus           rv;
 
     PORT_Assert( ss->opt.noLocks || ssl_HaveRecvBufLock(ss) );
@@ skipping 16 matching lines @@
     rv = ssl3_NegotiateVersion(ss, SSL_LIBRARY_VERSION_MAX_SUPPORTED,
                                PR_TRUE);
     if (rv != SECSuccess) {
         return rv;
     }
 
     ss->sec.send         = ssl3_SendApplicationData;
 
     return SECSuccess;
 }