Rest of software updater, ready to test...

1 files changed, 187 insertions, 0 deletions

diff --git a/node/SoftwareUpdater.cpp b/node/SoftwareUpdater.cpp
new file mode 100644
index 00000000..4cb2f7e4
--- /dev/null
+++ b/node/SoftwareUpdater.cpp
@@ -0,0 +1,187 @@
+/*
+ * ZeroTier One - Global Peer to Peer Ethernet
+ * Copyright (C) 2012-2013  ZeroTier Networks LLC
+ *
+ * This program 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * --
+ *
+ * ZeroTier may be used and distributed under the terms of the GPLv3, which
+ * are available at: http://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * If you would like to embed ZeroTier into a commercial application or
+ * redistribute it in a modified binary form, please contact ZeroTier Networks
+ * LLC. Start here: http://www.zerotier.com/
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../version.h"
+
+#include "SoftwareUpdater.hpp"
+#include "Dictionary.hpp"
+#include "C25519.hpp"
+#include "Identity.hpp"
+#include "Logger.hpp"
+#include "RuntimeEnvironment.hpp"
+#include "Thread.hpp"
+#include "Node.hpp"
+
+#ifdef __UNIX_LIKE__
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#endif
+
+namespace ZeroTier {
+
+SoftwareUpdater::SoftwareUpdater(const RuntimeEnvironment *renv) :
+	_r(renv),
+	_myVersion(packVersion(ZEROTIER_ONE_VERSION_MAJOR,ZEROTIER_ONE_VERSION_MINOR,ZEROTIER_ONE_VERSION_REVISION)),
+	_lastUpdateAttempt(0),
+	_status(UPDATE_STATUS_IDLE),
+	_die(false),
+	_lock()
+{
+}
+
+SoftwareUpdater::~SoftwareUpdater()
+{
+	_die = true;
+	for(;;) {
+		_lock.lock();
+		bool ip = (_status != UPDATE_STATUS_IDLE);
+		_lock.unlock();
+		if (ip)
+			Thread::sleep(500);
+		else break;
+	}
+}
+
+void SoftwareUpdater::_cbHandleGetLatestVersionInfo(void *arg,int code,const std::string &url,bool onDisk,const std::string &body)
+{
+	SoftwareUpdater *upd = (SoftwareUpdater *)arg;
+	const RuntimeEnvironment *_r = (const RuntimeEnvironment *)upd->_r;
+	Mutex::Lock _l(upd->_lock);
+
+	if ((upd->_die)||(upd->_status != UPDATE_STATUS_GETTING_NFO)) {
+		upd->_status = UPDATE_STATUS_IDLE;
+		return;
+	}
+
+	if (code != 200) {
+		LOG("unable to check for software updates, response code %d (%s)",code,body.c_str());
+		upd->_status = UPDATE_STATUS_IDLE;
+		return;
+	}
+
+	try {
+		Dictionary nfo(body);
+		const unsigned int vMajor = Utils::strToUInt(nfo.get("vMajor").c_str());
+		const unsigned int vMinor = Utils::strToUInt(nfo.get("vMinor").c_str());
+		const unsigned int vRevision = Utils::strToUInt(nfo.get("vRevision").c_str());
+		const Address signedBy(nfo.get("signedBy"));
+		const std::string signature(Utils::unhex(nfo.get("ed25519")));
+		const std::string &url = nfo.get("url");
+
+		if (signature.length() != ZT_C25519_SIGNATURE_LEN) {
+			LOG("software update aborted: .nfo file invalid: bad Ed25519 signature");
+			upd->_status = UPDATE_STATUS_IDLE;
+			return;
+		}
+		if ((url.length() <= 7)||(url.substr(0,7) != "http://")) {
+			LOG("software update aborted: .nfo file invalid: update URL must begin with http://");
+			upd->_status = UPDATE_STATUS_IDLE;
+			return;
+		}
+		if (packVersion(vMajor,vMinor,vRevision) <= upd->_myVersion) {
+			LOG("software update aborted: .nfo file invalid: version on web site <= my version");
+			upd->_status = UPDATE_STATUS_IDLE;
+			return;
+		}
+
+		if (!ZT_DEFAULTS.updateAuthorities.count(signedBy)) {
+			LOG("software update aborted: .nfo file specifies unknown signing authority");
+			upd->_status = UPDATE_STATUS_IDLE;
+			return;
+		}
+
+		upd->_status = UPDATE_STATUS_GETTING_FILE;
+		upd->_signedBy = signedBy;
+		upd->_signature = signature;
+
+		HttpClient::GET(url,HttpClient::NO_HEADERS,ZT_UPDATE_HTTP_TIMEOUT,&_cbHandleGetLatestVersionBinary,arg);
+	} catch ( ... ) {
+		LOG("software update check failed: .nfo file invalid: fields missing or invalid dictionary format");
+		upd->_status = UPDATE_STATUS_IDLE;
+	}
+}
+
+void SoftwareUpdater::_cbHandleGetLatestVersionBinary(void *arg,int code,const std::string &url,bool onDisk,const std::string &body)
+{
+	SoftwareUpdater *upd = (SoftwareUpdater *)arg;
+	const RuntimeEnvironment *_r = (const RuntimeEnvironment *)upd->_r;
+	Mutex::Lock _l(upd->_lock);
+
+	std::map< Address,Identity >::const_iterator updateAuthority = ZT_DEFAULTS.updateAuthorities.find(upd->_signedBy);
+	if (updateAuthority == ZT_DEFAULTS.updateAuthorities.end()) { // sanity check, shouldn't happen
+		LOG("software update aborted: .nfo file specifies unknown signing authority");
+		upd->_status = UPDATE_STATUS_IDLE;
+		return;
+	}
+
+	// The all-important authenticity check... :)
+	if (!updateAuthority->second.verify(body.data(),body.length(),upd->_signature.data(),upd->_signature.length())) {
+		LOG("software update aborted: update fetched from '%s' failed certificate check against signer %s",url.c_str(),updateAuthority->first.toString().c_str());
+		upd->_status = UPDATE_STATUS_IDLE;
+		return;
+	}
+
+#ifdef __UNIX_LIKE__
+	size_t lastSlash = url.rfind('/');
+	if (lastSlash == std::string::npos) { // sanity check, shouldn't happen
+		LOG("software update aborted: invalid URL");
+		upd->_status = UPDATE_STATUS_IDLE;
+		return;
+	}
+	std::string updatesDir(_r->homePath + ZT_PATH_SEPARATOR_S + "updates.d");
+	std::string updatePath(updatesDir + ZT_PATH_SEPARATOR_S + url.substr(lastSlash + 1));
+	mkdir(updatesDir.c_str(),0755);
+
+	int fd = ::open(updatePath.c_str(),O_WRONLY|O_CREAT|O_TRUNC,0755);
+	if (fd <= 0) {
+		LOG("software update aborted: unable to open %s for writing",updatePath.c_str());
+		upd->_status = UPDATE_STATUS_IDLE;
+		return;
+	}
+	if ((long)::write(fd,body.data(),body.length()) != (long)body.length()) {
+		LOG("software update aborted: unable to write to %s",updatePath.c_str());
+		upd->_status = UPDATE_STATUS_IDLE;
+		return;
+	}
+	::close(fd);
+	::chmod(updatePath.c_str(),0755);
+
+	_r->node->terminate(Node::NODE_RESTART_FOR_UPGRADE,updatePath.c_str());
+#endif
+
+#ifdef __WINDOWS__
+	todo;
+#endif
+}
+
+} // namespace ZeroTier