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- /* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this software; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
- * USA.
- */
- #include <stdio.h>
- #include <string.h>
- #include <rfb/Exception.h>
- #include <rfb/fenceTypes.h>
- #include <rfb/CMsgReader.h>
- #include <rfb/CMsgWriter.h>
- #include <rfb/CSecurity.h>
- #include <rfb/Security.h>
- #include <rfb/CConnection.h>
- #include <rfb/util.h>
-
- #include <rfb/LogWriter.h>
-
- using namespace rfb;
-
- static LogWriter vlog("CConnection");
-
- CConnection::CConnection()
- : csecurity(0), is(0), os(0), reader_(0), writer_(0),
- shared(false),
- state_(RFBSTATE_UNINITIALISED), useProtocol3_3(false)
- {
- security = new SecurityClient();
- }
-
- CConnection::~CConnection()
- {
- if (csecurity) csecurity->destroy();
- delete reader_;
- reader_ = 0;
- delete writer_;
- writer_ = 0;
- }
-
- void CConnection::setStreams(rdr::InStream* is_, rdr::OutStream* os_)
- {
- is = is_;
- os = os_;
- }
-
- void CConnection::initialiseProtocol()
- {
- state_ = RFBSTATE_PROTOCOL_VERSION;
- }
-
- void CConnection::processMsg()
- {
- switch (state_) {
-
- case RFBSTATE_PROTOCOL_VERSION: processVersionMsg(); break;
- case RFBSTATE_SECURITY_TYPES: processSecurityTypesMsg(); break;
- case RFBSTATE_SECURITY: processSecurityMsg(); break;
- case RFBSTATE_SECURITY_RESULT: processSecurityResultMsg(); break;
- case RFBSTATE_INITIALISATION: processInitMsg(); break;
- case RFBSTATE_NORMAL: reader_->readMsg(); break;
- case RFBSTATE_UNINITIALISED:
- throw Exception("CConnection::processMsg: not initialised yet?");
- default:
- throw Exception("CConnection::processMsg: invalid state");
- }
- }
-
- void CConnection::processVersionMsg()
- {
- vlog.debug("reading protocol version");
- bool done;
- if (!cp.readVersion(is, &done)) {
- state_ = RFBSTATE_INVALID;
- throw Exception("reading version failed: not an RFB server?");
- }
- if (!done) return;
-
- vlog.info("Server supports RFB protocol version %d.%d",
- cp.majorVersion, cp.minorVersion);
-
- // The only official RFB protocol versions are currently 3.3, 3.7 and 3.8
- if (cp.beforeVersion(3,3)) {
- vlog.error("Server gave unsupported RFB protocol version %d.%d",
- cp.majorVersion, cp.minorVersion);
- state_ = RFBSTATE_INVALID;
- throw Exception("Server gave unsupported RFB protocol version %d.%d",
- cp.majorVersion, cp.minorVersion);
- } else if (useProtocol3_3 || cp.beforeVersion(3,7)) {
- cp.setVersion(3,3);
- } else if (cp.afterVersion(3,8)) {
- cp.setVersion(3,8);
- }
-
- cp.writeVersion(os);
- state_ = RFBSTATE_SECURITY_TYPES;
-
- vlog.info("Using RFB protocol version %d.%d",
- cp.majorVersion, cp.minorVersion);
- }
-
-
- void CConnection::processSecurityTypesMsg()
- {
- vlog.debug("processing security types message");
-
- int secType = secTypeInvalid;
-
- std::list<rdr::U8> secTypes;
- secTypes = security->GetEnabledSecTypes();
-
- if (cp.isVersion(3,3)) {
-
- // legacy 3.3 server may only offer "vnc authentication" or "none"
-
- secType = is->readU32();
- if (secType == secTypeInvalid) {
- throwConnFailedException();
-
- } else if (secType == secTypeNone || secType == secTypeVncAuth) {
- std::list<rdr::U8>::iterator i;
- for (i = secTypes.begin(); i != secTypes.end(); i++)
- if (*i == secType) {
- secType = *i;
- break;
- }
-
- if (i == secTypes.end())
- secType = secTypeInvalid;
- } else {
- vlog.error("Unknown 3.3 security type %d", secType);
- throw Exception("Unknown 3.3 security type");
- }
-
- } else {
-
- // >=3.7 server will offer us a list
-
- int nServerSecTypes = is->readU8();
- if (nServerSecTypes == 0)
- throwConnFailedException();
-
- std::list<rdr::U8>::iterator j;
-
- for (int i = 0; i < nServerSecTypes; i++) {
- rdr::U8 serverSecType = is->readU8();
- vlog.debug("Server offers security type %s(%d)",
- secTypeName(serverSecType), serverSecType);
-
- /*
- * Use the first type sent by server which matches client's type.
- * It means server's order specifies priority.
- */
- if (secType == secTypeInvalid) {
- for (j = secTypes.begin(); j != secTypes.end(); j++)
- if (*j == serverSecType) {
- secType = *j;
- break;
- }
- }
- }
-
- // Inform the server of our decision
- if (secType != secTypeInvalid) {
- os->writeU8(secType);
- os->flush();
- vlog.info("Choosing security type %s(%d)",secTypeName(secType),secType);
- }
- }
-
- if (secType == secTypeInvalid) {
- state_ = RFBSTATE_INVALID;
- vlog.error("No matching security types");
- throw Exception("No matching security types");
- }
-
- state_ = RFBSTATE_SECURITY;
- csecurity = security->GetCSecurity(secType);
- processSecurityMsg();
- }
-
- void CConnection::processSecurityMsg()
- {
- vlog.debug("processing security message");
- if (csecurity->processMsg(this)) {
- state_ = RFBSTATE_SECURITY_RESULT;
- processSecurityResultMsg();
- }
- }
-
- void CConnection::processSecurityResultMsg()
- {
- vlog.debug("processing security result message");
- int result;
- if (cp.beforeVersion(3,8) && csecurity->getType() == secTypeNone) {
- result = secResultOK;
- } else {
- if (!is->checkNoWait(1)) return;
- result = is->readU32();
- }
- switch (result) {
- case secResultOK:
- securityCompleted();
- return;
- case secResultFailed:
- vlog.debug("auth failed");
- break;
- case secResultTooMany:
- vlog.debug("auth failed - too many tries");
- break;
- default:
- throw Exception("Unknown security result from server");
- }
- CharArray reason;
- if (cp.beforeVersion(3,8))
- reason.buf = strDup("Authentication failure");
- else
- reason.buf = is->readString();
- state_ = RFBSTATE_INVALID;
- throw AuthFailureException(reason.buf);
- }
-
- void CConnection::processInitMsg()
- {
- vlog.debug("reading server initialisation");
- reader_->readServerInit();
- }
-
- void CConnection::throwConnFailedException()
- {
- state_ = RFBSTATE_INVALID;
- CharArray reason;
- reason.buf = is->readString();
- throw ConnFailedException(reason.buf);
- }
-
- void CConnection::securityCompleted()
- {
- state_ = RFBSTATE_INITIALISATION;
- reader_ = new CMsgReader(this, is);
- writer_ = new CMsgWriter(&cp, os);
- vlog.debug("Authentication success!");
- authSuccess();
- writer_->writeClientInit(shared);
- }
-
- void CConnection::authSuccess()
- {
- }
-
- void CConnection::serverInit()
- {
- state_ = RFBSTATE_NORMAL;
- vlog.debug("initialisation done");
- }
-
- void CConnection::fence(rdr::U32 flags, unsigned len, const char data[])
- {
- CMsgHandler::fence(flags, len, data);
-
- if (!(flags & fenceFlagRequest))
- return;
-
- // We cannot guarantee any synchronisation at this level
- flags = 0;
-
- writer()->writeFence(flags, len, data);
- }
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