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/*
* 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 <string.h>
#include <memory>
#include <string>
#include <json/json.h>
#include "NodeConfig.hpp"
#include "RuntimeEnvironment.hpp"
#include "Defaults.hpp"
#include "Utils.hpp"
#include "Logger.hpp"
namespace ZeroTier {
NodeConfig::NodeConfig(const RuntimeEnvironment *renv,const std::string &url) :
_r(renv),
_lastAutoconfigure(0),
_lastAutoconfigureLastModified(),
_url(url),
_autoconfigureLock(),
_networks(),
_networks_m()
{
}
NodeConfig::~NodeConfig()
{
_autoconfigureLock.lock(); // wait for any autoconfs to finish
_autoconfigureLock.unlock();
}
void NodeConfig::refreshConfiguration()
{
_autoconfigureLock.lock(); // unlocked when handler gets called
TRACE("refreshing autoconfigure URL %s (if modified since: '%s')",_url.c_str(),_lastAutoconfigureLastModified.c_str());
std::map<std::string,std::string> reqHeaders;
reqHeaders["X-ZT-ID"] = _r->identity.toString(false);
reqHeaders["X-ZT-OVSH"] = _r->ownershipVerificationSecretHash;
if (_lastAutoconfigureLastModified.length())
reqHeaders["If-Modified-Since"] = _lastAutoconfigureLastModified;
new Http::Request(Http::HTTP_METHOD_GET,_url,reqHeaders,std::string(),&NodeConfig::_CBautoconfHandler,this);
}
void NodeConfig::__CBautoconfHandler(const std::string &lastModified,const std::string &body)
{
try {
Json::Value root;
Json::Reader reader;
std::string dec(_r->identity.decrypt(_r->configAuthority,body.data(),body.length()));
if (!dec.length()) {
LOG("autoconfigure from %s failed: data did not decrypt as from config authority %s",_url.c_str(),_r->configAuthority.address().toString().c_str());
return;
}
TRACE("decrypted autoconf: %s",dec.c_str());
if (!reader.parse(dec,root,false)) {
LOG("autoconfigure from %s failed: JSON parse error: %s",_url.c_str(),reader.getFormattedErrorMessages().c_str());
return;
}
if (!root.isObject()) {
LOG("autoconfigure from %s failed: not a JSON object",_url.c_str());
return;
}
// Configure networks
const Json::Value &networks = root["_networks"];
if (networks.isArray()) {
Mutex::Lock _l(_networks_m);
for(unsigned int ni=0;ni<networks.size();++ni) {
if (networks[ni].isObject()) {
const Json::Value &nwid_ = networks[ni]["id"];
uint64_t nwid = nwid_.isNumeric() ? (uint64_t)nwid_.asUInt64() : (uint64_t)strtoull(networks[ni]["id"].asString().c_str(),(char **)0,10);
if (nwid) {
SharedPtr<Network> nw;
std::map< uint64_t,SharedPtr<Network> >::iterator nwent(_networks.find(nwid));
if (nwent != _networks.end())
nw = nwent->second;
else {
try {
nw = SharedPtr<Network>(new Network(_r,nwid));
_networks[nwid] = nw;
} catch (std::exception &exc) {
LOG("unable to create network %llu: %s",nwid,exc.what());
} catch ( ... ) {
LOG("unable to create network %llu: unknown exception",nwid);
}
}
if (nw) {
Mutex::Lock _l2(nw->_lock);
nw->_open = networks[ni]["isOpen"].asBool();
// Ensure that TAP device has all the right IP addresses
// TODO: IPv6 might work a tad differently
std::set<InetAddress> allIps;
const Json::Value &addresses = networks[ni]["_addresses"];
if (addresses.isArray()) {
for(unsigned int ai=0;ai<addresses.size();++ai) {
if (addresses[ai].isString()) {
InetAddress addr(addresses[ai].asString());
if (addr) {
TRACE("network %llu IP/netmask: %s",nwid,addr.toString().c_str());
allIps.insert(addr);
}
}
}
}
nw->_tap.setIps(allIps);
// NOTE: the _members field is optional for open networks,
// since members of open nets do not need to check membership
// of packet senders and mutlicasters.
const Json::Value &members = networks[ni]["_members"];
nw->_members.clear();
if (members.isArray()) {
for(unsigned int mi=0;mi<members.size();++mi) {
std::string rawAddr(Utils::unhex(members[mi].asString()));
if (rawAddr.length() == ZT_ADDRESS_LENGTH) {
Address addr(rawAddr.data());
if ((addr)&&(!addr.isReserved())) {
TRACE("network %llu member: %s",nwid,addr.toString().c_str());
nw->_members.insert(addr);
}
}
}
}
}
} else {
TRACE("ignored networks[%u], 'id' field missing");
}
} else {
TRACE("ignored networks[%u], not a JSON object",ni);
}
}
}
_lastAutoconfigure = Utils::now();
_lastAutoconfigureLastModified = lastModified;
} catch (std::exception &exc) {
TRACE("exception parsing autoconf URL response: %s",exc.what());
} catch ( ... ) {
TRACE("unexpected exception parsing autoconf URL response");
}
}
bool NodeConfig::_CBautoconfHandler(Http::Request *req,void *arg,const std::string &url,int code,const std::map<std::string,std::string> &headers,const std::string &body)
{
#ifdef ZT_TRACE
const RuntimeEnvironment *_r = ((NodeConfig *)arg)->_r;
#endif
if (code == 200) {
TRACE("200 got autoconfigure response from %s: %u bytes",url.c_str(),(unsigned int)body.length());
std::map<std::string,std::string>::const_iterator lm(headers.find("Last-Modified"));
if (lm != headers.end())
((NodeConfig *)arg)->__CBautoconfHandler(lm->second,body);
else ((NodeConfig *)arg)->__CBautoconfHandler(std::string(),body);
} else if (code == 304) {
TRACE("304 autoconfigure deferred, remote URL %s not modified",url.c_str());
((NodeConfig *)arg)->_lastAutoconfigure = Utils::now(); // still considered a success
} else if (code == 409) { // conflict, ID address in use by another ID
TRACE("%d autoconfigure failed from %s",code,url.c_str());
} else {
TRACE("%d autoconfigure failed from %s",code,url.c_str());
}
((NodeConfig *)arg)->_autoconfigureLock.unlock();
return false; // causes Request to delete itself
}
} // namespace ZeroTier
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