/*
* 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 .
*
* --
*
* 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
#include
#include
#include
#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"
#include "Utils.hpp"
#ifdef __UNIX_LIKE__
#include
#include
#include
#include
#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::cleanOldUpdates()
{
std::string updatesDir(_r->homePath + ZT_PATH_SEPARATOR_S + "updates.d");
std::map dl(Utils::listDirectory(updatesDir.c_str()));
for(std::map::iterator i(dl.begin());i!=dl.end();++i) {
if (!i->second)
Utils::rm(i->first.c_str());
}
}
const char *SoftwareUpdater::parseNfo(
const char *nfoText,
unsigned int &vMajor,
unsigned int &vMinor,
unsigned int &vRevision,
Address &signedBy,
std::string &signature,
std::string &url)
{
try {
Dictionary nfo(nfoText);
vMajor = Utils::strToUInt(nfo.get("vMajor").c_str());
vMinor = Utils::strToUInt(nfo.get("vMinor").c_str());
vRevision = Utils::strToUInt(nfo.get("vRevision").c_str());
signedBy = nfo.get("signedBy");
signature = Utils::unhex(nfo.get("ed25519"));
url = nfo.get("url");
if (signature.length() != ZT_C25519_SIGNATURE_LEN)
return "bad ed25519 signature, invalid length";
if ((url.length() <= 7)||(url.substr(0,7) != "http://"))
return "invalid URL, must begin with http://";
return (const char *)0;
} catch ( ... ) {
return "invalid NFO file format or one or more required fields missing";
}
}
bool SoftwareUpdater::validateUpdate(
const void *data,
unsigned int len,
const Address &signedBy,
const std::string &signature)
{
std::map< Address,Identity >::const_iterator updateAuthority = ZT_DEFAULTS.updateAuthorities.find(signedBy);
if (updateAuthority == ZT_DEFAULTS.updateAuthorities.end())
return false;
return updateAuthority->second.verify(data,len,signature.data(),(unsigned int)signature.length());
}
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("software update check failed: server responded %d (%s)",code,body.c_str());
upd->_status = UPDATE_STATUS_IDLE;
return;
}
try {
unsigned int vMajor = 0,vMinor = 0,vRevision = 0;
Address signedBy;
std::string signature,url;
const char *err = parseNfo(body.c_str(),vMajor,vMinor,vRevision,signedBy,signature,url);
if (err) {
LOG("software update aborted: .nfo file error: %s",err);
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;
}
#ifndef ZT_ALWAYS_UPDATE /* for testing */
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;
}
#endif
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 or missing field(s)");
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);
if (!validateUpdate(body.data(),(unsigned int)body.length(),upd->_signedBy,upd->_signature)) {
LOG("software update aborted: update fetched from '%s' failed signature check (got %u bytes)",url.c_str(),(unsigned int)body.length());
upd->_status = UPDATE_STATUS_IDLE;
return;
}
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));
#ifdef __WINDOWS__
CreateDirectoryA(updatesDir.c_str(),NULL);
#else
mkdir(updatesDir.c_str(),0755);
#endif
FILE *upf = fopen(updatePath.c_str(),"wb");
if (!upf) {
LOG("software update aborted: unable to open %s for writing",updatePath.c_str());
upd->_status = UPDATE_STATUS_IDLE;
return;
}
if (fwrite(body.data(),body.length(),1,upf) != 1) {
LOG("software update aborted: unable to write to %s",updatePath.c_str());
upd->_status = UPDATE_STATUS_IDLE;
fclose(upf);
Utils::rm(updatePath);
return;
}
fclose(upf);
#ifdef __UNIX_LIKE__
::chmod(updatePath.c_str(),0755);
#endif
// We exit with this reason code and the path as the text. It is the
// caller's responsibility (main.c) to pick this up and do the right
// thing.
upd->_status = UPDATE_STATUS_IDLE;
_r->node->terminate(Node::NODE_RESTART_FOR_UPGRADE,updatePath.c_str());
}
} // namespace ZeroTier