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ZeroTierOne/node/Node.cpp

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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 <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include <map>
#include <set>
#include <utility>
#include <algorithm>
#include <list>
#include <vector>
#include <string>
#include "Constants.hpp"
#ifdef __WINDOWS__
#include <WinSock2.h>
#include <Windows.h>
#endif
#include "Condition.hpp"
#include "Node.hpp"
#include "Topology.hpp"
#include "Demarc.hpp"
#include "Packet.hpp"
#include "Switch.hpp"
#include "Utils.hpp"
#include "EthernetTap.hpp"
#include "Logger.hpp"
#include "InetAddress.hpp"
#include "Salsa20.hpp"
#include "RuntimeEnvironment.hpp"
#include "NodeConfig.hpp"
#include "Defaults.hpp"
#include "SysEnv.hpp"
#include "Network.hpp"
#include "MulticastGroup.hpp"
#include "Mutex.hpp"
#include "Multicaster.hpp"
#include "CMWC4096.hpp"
#include "SHA512.hpp"
#include "Service.hpp"
#ifdef __WINDOWS__
#include <Windows.h>
#else
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <sys/file.h>
#endif
#include "../version.h"
namespace ZeroTier {
struct _LocalClientImpl
{
unsigned char key[32];
UdpSocket *sock;
void (*resultHandler)(void *,unsigned long,const char *);
void *arg;
unsigned int controlPort;
InetAddress localDestAddr;
Mutex inUseLock;
};
static void _CBlocalClientHandler(UdpSocket *sock,void *arg,const InetAddress &remoteAddr,const void *data,unsigned int len)
{
_LocalClientImpl *impl = (_LocalClientImpl *)arg;
if (!impl)
return;
if (!impl->resultHandler)
return; // sanity check
Mutex::Lock _l(impl->inUseLock);
try {
unsigned long convId = 0;
std::vector<std::string> results;
if (!NodeConfig::decodeControlMessagePacket(impl->key,data,len,convId,results))
return;
for(std::vector<std::string>::iterator r(results.begin());r!=results.end();++r)
impl->resultHandler(impl->arg,convId,r->c_str());
} catch ( ... ) {}
}
Node::LocalClient::LocalClient(const char *authToken,unsigned int controlPort,void (*resultHandler)(void *,unsigned long,const char *),void *arg)
throw() :
_impl((void *)0)
{
_LocalClientImpl *impl = new _LocalClientImpl;
UdpSocket *sock = (UdpSocket *)0;
for(unsigned int i=0;i<5000;++i) {
try {
sock = new UdpSocket(true,32768 + (rand() % 20000),false,&_CBlocalClientHandler,impl);
break;
} catch ( ... ) {
sock = (UdpSocket *)0;
}
}
// If socket fails to bind, there's a big problem like missing IPv4 stack
if (sock) {
{
unsigned int csk[64];
SHA512::hash(csk,authToken,strlen(authToken));
memcpy(impl->key,csk,32);
}
impl->sock = sock;
impl->resultHandler = resultHandler;
impl->arg = arg;
impl->controlPort = (controlPort) ? controlPort : (unsigned int)ZT_DEFAULT_CONTROL_UDP_PORT;
impl->localDestAddr = InetAddress::LO4;
impl->localDestAddr.setPort(impl->controlPort);
_impl = impl;
} else delete impl;
}
Node::LocalClient::~LocalClient()
{
if (_impl) {
((_LocalClientImpl *)_impl)->inUseLock.lock();
delete ((_LocalClientImpl *)_impl)->sock;
((_LocalClientImpl *)_impl)->inUseLock.unlock();
delete ((_LocalClientImpl *)_impl);
}
}
unsigned long Node::LocalClient::send(const char *command)
throw()
{
if (!_impl)
return 0;
_LocalClientImpl *impl = (_LocalClientImpl *)_impl;
Mutex::Lock _l(impl->inUseLock);
try {
uint32_t convId = (uint32_t)rand();
if (!convId)
convId = 1;
std::vector<std::string> tmp;
tmp.push_back(std::string(command));
std::vector< Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> > packets(NodeConfig::encodeControlMessage(impl->key,convId,tmp));
for(std::vector< Buffer<ZT_NODECONFIG_MAX_PACKET_SIZE> >::iterator p(packets.begin());p!=packets.end();++p)
impl->sock->send(impl->localDestAddr,p->data(),p->size(),-1);
return convId;
} catch ( ... ) {
return 0;
}
}
struct _NodeImpl
{
RuntimeEnvironment renv;
unsigned int port;
unsigned int controlPort;
std::string reasonForTerminationStr;
volatile Node::ReasonForTermination reasonForTermination;
volatile bool started;
volatile bool running;
inline Node::ReasonForTermination terminate()
{
RuntimeEnvironment *_r = &renv;
LOG("terminating: %s",reasonForTerminationStr.c_str());
renv.shutdownInProgress = true;
Thread::sleep(500);
running = false;
#ifndef __WINDOWS__
delete renv.netconfService;
#endif
delete renv.nc;
delete renv.sysEnv;
delete renv.topology;
delete renv.demarc;
delete renv.sw;
delete renv.multicaster;
delete renv.prng;
delete renv.log;
return reasonForTermination;
}
inline Node::ReasonForTermination terminateBecause(Node::ReasonForTermination r,const char *rstr)
{
reasonForTerminationStr = rstr;
reasonForTermination = r;
return terminate();
}
};
#ifndef __WINDOWS__
static void _netconfServiceMessageHandler(void *renv,Service &svc,const Dictionary &msg)
{
if (!renv)
return; // sanity check
const RuntimeEnvironment *_r = (const RuntimeEnvironment *)renv;
try {
//TRACE("from netconf:\n%s",msg.toString().c_str());
const std::string &type = msg.get("type");
if (type == "netconf-response") {
uint64_t inRePacketId = strtoull(msg.get("requestId").c_str(),(char **)0,16);
uint64_t nwid = strtoull(msg.get("nwid").c_str(),(char **)0,16);
Address peerAddress(msg.get("peer").c_str());
if (peerAddress) {
if (msg.contains("error")) {
Packet::ErrorCode errCode = Packet::ERROR_INVALID_REQUEST;
const std::string &err = msg.get("error");
if (err == "OBJ_NOT_FOUND")
errCode = Packet::ERROR_OBJ_NOT_FOUND;
Packet outp(peerAddress,_r->identity.address(),Packet::VERB_ERROR);
outp.append((unsigned char)Packet::VERB_NETWORK_CONFIG_REQUEST);
outp.append(inRePacketId);
outp.append((unsigned char)errCode);
outp.append(nwid);
_r->sw->send(outp,true);
} else if (msg.contains("netconf")) {
const std::string &netconf = msg.get("netconf");
if (netconf.length() < 2048) { // sanity check
Packet outp(peerAddress,_r->identity.address(),Packet::VERB_OK);
outp.append((unsigned char)Packet::VERB_NETWORK_CONFIG_REQUEST);
outp.append(inRePacketId);
outp.append(nwid);
outp.append((uint16_t)netconf.length());
outp.append(netconf.data(),netconf.length());
outp.compress();
_r->sw->send(outp,true);
}
}
}
}
} catch (std::exception &exc) {
LOG("unexpected exception parsing response from netconf service: %s",exc.what());
} catch ( ... ) {
LOG("unexpected exception parsing response from netconf service: unknown exception");
}
}
#endif // !__WINDOWS__
Node::Node(const char *hp,unsigned int port,unsigned int controlPort)
throw() :
_impl(new _NodeImpl)
{
_NodeImpl *impl = (_NodeImpl *)_impl;
if ((hp)&&(strlen(hp) > 0))
impl->renv.homePath = hp;
else impl->renv.homePath = ZT_DEFAULTS.defaultHomePath;
impl->port = (port) ? port : (unsigned int)ZT_DEFAULT_UDP_PORT;
impl->controlPort = (controlPort) ? controlPort : (unsigned int)ZT_DEFAULT_CONTROL_UDP_PORT;
impl->reasonForTermination = Node::NODE_RUNNING;
impl->started = false;
impl->running = false;
}
Node::~Node()
{
delete (_NodeImpl *)_impl;
}
Node::ReasonForTermination Node::run()
throw()
{
_NodeImpl *impl = (_NodeImpl *)_impl;
RuntimeEnvironment *_r = (RuntimeEnvironment *)&(impl->renv);
impl->started = true;
impl->running = true;
try {
#ifdef ZT_LOG_STDOUT
_r->log = new Logger((const char *)0,(const char *)0,0);
#else
_r->log = new Logger((_r->homePath + ZT_PATH_SEPARATOR_S + "node.log").c_str(),(const char *)0,131072);
#endif
LOG("%s starting version %s",_r->identity.address().toString().c_str(),versionString());
// Create non-crypto PRNG right away in case other code in init wants to use it
_r->prng = new CMWC4096();
bool gotId = false;
std::string identitySecretPath(_r->homePath + ZT_PATH_SEPARATOR_S + "identity.secret");
std::string identityPublicPath(_r->homePath + ZT_PATH_SEPARATOR_S + "identity.public");
std::string idser;
if (Utils::readFile(identitySecretPath.c_str(),idser))
gotId = _r->identity.fromString(idser);
if (gotId) {
// Make sure identity.public matches identity.secret
idser = std::string();
Utils::readFile(identityPublicPath.c_str(),idser);
std::string pubid(_r->identity.toString(false));
if (idser != pubid) {
if (!Utils::writeFile(identityPublicPath.c_str(),pubid))
return impl->terminateBecause(Node::NODE_UNRECOVERABLE_ERROR,"could not write identity.public (home path not writable?)");
}
} else {
LOG("no identity found or identity invalid, generating one... this might take a few seconds...");
_r->identity.generate();
LOG("generated new identity: %s",_r->identity.address().toString().c_str());
idser = _r->identity.toString(true);
if (!Utils::writeFile(identitySecretPath.c_str(),idser))
return impl->terminateBecause(Node::NODE_UNRECOVERABLE_ERROR,"could not write identity.secret (home path not writable?)");
idser = _r->identity.toString(false);
if (!Utils::writeFile(identityPublicPath.c_str(),idser))
return impl->terminateBecause(Node::NODE_UNRECOVERABLE_ERROR,"could not write identity.public (home path not writable?)");
}
Utils::lockDownFile(identitySecretPath.c_str(),false);
// Clean up some obsolete files if present -- this will be removed later
Utils::rm((_r->homePath + ZT_PATH_SEPARATOR_S + "status"));
Utils::rm((_r->homePath + ZT_PATH_SEPARATOR_S + "thisdeviceismine"));
// Make sure networks.d exists
#ifdef __WINDOWS__
CreateDirectoryA((_r->homePath + ZT_PATH_SEPARATOR_S + "networks.d").c_str(),NULL);
#else
mkdir((_r->homePath + ZT_PATH_SEPARATOR_S + "networks.d").c_str(),0700);
#endif
// Load or generate config authentication secret
std::string configAuthTokenPath(_r->homePath + ZT_PATH_SEPARATOR_S + "authtoken.secret");
std::string configAuthToken;
if (!Utils::readFile(configAuthTokenPath.c_str(),configAuthToken)) {
configAuthToken = "";
unsigned int sr = 0;
for(unsigned int i=0;i<24;++i) {
Utils::getSecureRandom(&sr,sizeof(sr));
configAuthToken.push_back("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"[sr % 62]);
}
if (!Utils::writeFile(configAuthTokenPath.c_str(),configAuthToken))
return impl->terminateBecause(Node::NODE_UNRECOVERABLE_ERROR,"could not write authtoken.secret (home path not writable?)");
}
Utils::lockDownFile(configAuthTokenPath.c_str(),false);
// Create the objects that make up runtime state.
_r->multicaster = new Multicaster();
_r->sw = new Switch(_r);
_r->demarc = new Demarc(_r);
_r->topology = new Topology(_r,(_r->homePath + ZT_PATH_SEPARATOR_S + "peer.db").c_str());
_r->sysEnv = new SysEnv(_r);
try {
_r->nc = new NodeConfig(_r,configAuthToken.c_str(),impl->controlPort);
} catch (std::exception &exc) {
char foo[1024];
Utils::snprintf(foo,sizeof(foo),"unable to bind to local control port %u: is another instance of ZeroTier One already running?",impl->controlPort);
return impl->terminateBecause(Node::NODE_UNRECOVERABLE_ERROR,foo);
}
_r->node = this;
// Bind local port for core I/O
if (!_r->demarc->bindLocalUdp(impl->port)) {
char foo[1024];
Utils::snprintf(foo,sizeof(foo),"unable to bind to global I/O port %u: is another instance of ZeroTier One already running?",impl->controlPort);
return impl->terminateBecause(Node::NODE_UNRECOVERABLE_ERROR,foo);
}
// Set initial supernode list
_r->topology->setSupernodes(ZT_DEFAULTS.supernodes);
} catch (std::bad_alloc &exc) {
return impl->terminateBecause(Node::NODE_UNRECOVERABLE_ERROR,"memory allocation failure");
} catch (std::runtime_error &exc) {
return impl->terminateBecause(Node::NODE_UNRECOVERABLE_ERROR,exc.what());
} catch ( ... ) {
return impl->terminateBecause(Node::NODE_UNRECOVERABLE_ERROR,"unknown exception during initialization");
}
// Start external service subprocesses, which is only used by special nodes
// right now and isn't available on Windows.
#ifndef __WINDOWS__
try {
std::string netconfServicePath(_r->homePath + ZT_PATH_SEPARATOR_S + "services.d" + ZT_PATH_SEPARATOR_S + "netconf.service");
if (Utils::fileExists(netconfServicePath.c_str())) {
LOG("netconf.d/netconfi.service appears to exist, starting...");
_r->netconfService = new Service(_r,"netconf",netconfServicePath.c_str(),&_netconfServiceMessageHandler,_r);
}
} catch ( ... ) {
LOG("unexpected exception attempting to start services");
}
#endif
// Core I/O loop
try {
uint64_t lastNetworkAutoconfCheck = 0;
uint64_t lastPingCheck = 0;
uint64_t lastClean = Utils::now(); // don't need to do this immediately
uint64_t lastNetworkFingerprintCheck = 0;
uint64_t networkConfigurationFingerprint = _r->sysEnv->getNetworkConfigurationFingerprint();
uint64_t lastMulticastCheck = 0;
uint64_t lastMulticastAnnounceAll = 0;
long lastDelayDelta = 0;
while (impl->reasonForTermination == NODE_RUNNING) {
uint64_t now = Utils::now();
bool resynchronize = false;
// Detect sleep/wake by looking for delay loop pauses that are longer
// than we intended to pause.
if (lastDelayDelta >= ZT_SLEEP_WAKE_DETECTION_THRESHOLD) {
resynchronize = true;
LOG("probable suspend/resume detected, pausing a moment for things to settle...");
Thread::sleep(ZT_SLEEP_WAKE_SETTLE_TIME);
}
// Periodically check our network environment, sending pings out to all
// our direct links if things look like we got a different address.
if ((resynchronize)||((now - lastNetworkFingerprintCheck) >= ZT_NETWORK_FINGERPRINT_CHECK_DELAY)) {
lastNetworkFingerprintCheck = now;
uint64_t fp = _r->sysEnv->getNetworkConfigurationFingerprint();
if (fp != networkConfigurationFingerprint) {
LOG("netconf fingerprint change: %.16llx != %.16llx, resyncing with network",networkConfigurationFingerprint,fp);
networkConfigurationFingerprint = fp;
resynchronize = true;
_r->nc->whackAllTaps(); // call whack() on all tap devices -- hack, might go away
}
}
// Request configuration for unconfigured nets, or nets with out of date
// configuration information.
if ((resynchronize)||((now - lastNetworkAutoconfCheck) >= ZT_NETWORK_AUTOCONF_CHECK_DELAY)) {
lastNetworkAutoconfCheck = now;
std::vector< SharedPtr<Network> > nets(_r->nc->networks());
for(std::vector< SharedPtr<Network> >::iterator n(nets.begin());n!=nets.end();++n) {
if ((now - (*n)->lastConfigUpdate()) >= ZT_NETWORK_AUTOCONF_DELAY)
(*n)->requestConfiguration();
}
}
// Periodically check for changes in our local multicast subscriptions and broadcast
// those changes to peers.
if ((resynchronize)||((now - lastMulticastCheck) >= ZT_MULTICAST_LOCAL_POLL_PERIOD)) {
lastMulticastCheck = now;
bool announceAll = ((resynchronize)||((now - lastMulticastAnnounceAll) >= ZT_MULTICAST_LIKE_ANNOUNCE_ALL_PERIOD));
try {
std::map< SharedPtr<Network>,std::set<MulticastGroup> > toAnnounce;
{
std::vector< SharedPtr<Network> > networks(_r->nc->networks());
for(std::vector< SharedPtr<Network> >::const_iterator nw(networks.begin());nw!=networks.end();++nw) {
if (((*nw)->updateMulticastGroups())||(announceAll))
toAnnounce.insert(std::pair< SharedPtr<Network>,std::set<MulticastGroup> >(*nw,(*nw)->multicastGroups()));
}
}
if (toAnnounce.size()) {
_r->sw->announceMulticastGroups(toAnnounce);
// Only update lastMulticastAnnounceAll if we've announced something. This keeps
// the announceAll condition true during startup when there are no multicast
// groups until there is at least one. Technically this shouldn't be required as
// updateMulticastGroups() should return true on any change, but why not?
if (announceAll)
lastMulticastAnnounceAll = now;
}
} catch (std::exception &exc) {
LOG("unexpected exception announcing multicast groups: %s",exc.what());
} catch ( ... ) {
LOG("unexpected exception announcing multicast groups: (unknown)");
}
}
if ((resynchronize)||((now - lastPingCheck) >= ZT_PING_CHECK_DELAY)) {
lastPingCheck = now;
try {
if (_r->topology->amSupernode()) {
// Supernodes are so super they don't even have to ping out, since
// all nodes ping them. They're also never firewalled so they
// don't need firewall openers. They just ping each other.
std::vector< SharedPtr<Peer> > sns(_r->topology->supernodePeers());
for(std::vector< SharedPtr<Peer> >::const_iterator p(sns.begin());p!=sns.end();++p) {
if ((now - (*p)->lastDirectSend()) > ZT_PEER_DIRECT_PING_DELAY)
_r->sw->sendHELLO((*p)->address());
}
} else {
std::vector< SharedPtr<Peer> > needPing,needFirewallOpener;
if (resynchronize) {
_r->topology->eachPeer(Topology::CollectPeersWithDirectPath(needPing));
} else {
_r->topology->eachPeer(Topology::CollectPeersThatNeedPing(needPing));
}
for(std::vector< SharedPtr<Peer> >::iterator p(needPing.begin());p!=needPing.end();++p) {
try {
_r->sw->sendHELLO((*p)->address());
} catch (std::exception &exc) {
LOG("unexpected exception sending HELLO to %s: %s",(*p)->address().toString().c_str());
} catch ( ... ) {
LOG("unexpected exception sending HELLO to %s: (unknown)",(*p)->address().toString().c_str());
}
}
_r->topology->eachPeer(Topology::CollectPeersThatNeedFirewallOpener(needFirewallOpener));
for(std::vector< SharedPtr<Peer> >::iterator p(needFirewallOpener.begin());p!=needFirewallOpener.end();++p) {
try {
(*p)->sendFirewallOpener(_r,now);
} catch (std::exception &exc) {
LOG("unexpected exception sending firewall opener to %s: %s",(*p)->address().toString().c_str(),exc.what());
} catch ( ... ) {
LOG("unexpected exception sending firewall opener to %s: (unknown)",(*p)->address().toString().c_str());
}
}
}
} catch (std::exception &exc) {
LOG("unexpected exception running ping check cycle: %s",exc.what());
} catch ( ... ) {
LOG("unexpected exception running ping check cycle: (unkonwn)");
}
}
if ((now - lastClean) >= ZT_DB_CLEAN_PERIOD) {
lastClean = now;
_r->topology->clean();
_r->nc->clean();
}
try {
unsigned long delay = std::min((unsigned long)ZT_MIN_SERVICE_LOOP_INTERVAL,_r->sw->doTimerTasks());
uint64_t start = Utils::now();
_r->mainLoopWaitCondition.wait(delay);
lastDelayDelta = (long)(Utils::now() - start) - (long)delay; // used to detect sleep/wake
} catch (std::exception &exc) {
LOG("unexpected exception running Switch doTimerTasks: %s",exc.what());
} catch ( ... ) {
LOG("unexpected exception running Switch doTimerTasks: (unknown)");
}
}
} catch ( ... ) {
return impl->terminateBecause(Node::NODE_UNRECOVERABLE_ERROR,"unexpected exception during outer main I/O loop");
}
return impl->terminate();
}
const char *Node::reasonForTermination() const
throw()
{
if ((!((_NodeImpl *)_impl)->started)||(((_NodeImpl *)_impl)->running))
return (const char *)0;
return ((_NodeImpl *)_impl)->reasonForTerminationStr.c_str();
}
void Node::terminate(ReasonForTermination reason,const char *reasonText)
throw()
{
((_NodeImpl *)_impl)->reasonForTermination = reason;
((_NodeImpl *)_impl)->reasonForTerminationStr = ((reasonText) ? reasonText : "");
((_NodeImpl *)_impl)->renv.mainLoopWaitCondition.signal();
}
class _VersionStringMaker
{
public:
char vs[32];
_VersionStringMaker()
{
Utils::snprintf(vs,sizeof(vs),"%d.%d.%d",(int)ZEROTIER_ONE_VERSION_MAJOR,(int)ZEROTIER_ONE_VERSION_MINOR,(int)ZEROTIER_ONE_VERSION_REVISION);
}
~_VersionStringMaker() {}
};
static const _VersionStringMaker __versionString;
const char *Node::versionString() throw() { return __versionString.vs; }
unsigned int Node::versionMajor() throw() { return ZEROTIER_ONE_VERSION_MAJOR; }
unsigned int Node::versionMinor() throw() { return ZEROTIER_ONE_VERSION_MINOR; }
unsigned int Node::versionRevision() throw() { return ZEROTIER_ONE_VERSION_REVISION; }
// Scanned for by loader and/or updater to determine a binary's version
const unsigned char EMBEDDED_VERSION_STAMP[20] = {
0x6d,0xfe,0xff,0x01,0x90,0xfa,0x89,0x57,0x88,0xa1,0xaa,0xdc,0xdd,0xde,0xb0,0x33,
ZEROTIER_ONE_VERSION_MAJOR,
ZEROTIER_ONE_VERSION_MINOR,
(unsigned char)(((unsigned int)ZEROTIER_ONE_VERSION_REVISION) & 0xff), /* little-endian */
(unsigned char)((((unsigned int)ZEROTIER_ONE_VERSION_REVISION) >> 8) & 0xff)
};
} // namespace ZeroTier
extern "C" {
ZeroTier::Node *zeroTierCreateNode(const char *hp,unsigned int port,unsigned int controlPort)
{
return new ZeroTier::Node(hp,port,controlPort);
}
void zeroTierDeleteNode(ZeroTier::Node *n)
{
delete n;
}
ZeroTier::Node::LocalClient *zeroTierCreateLocalClient(const char *authToken,unsigned int controlPort,void (*resultHandler)(void *,unsigned long,const char *),void *arg)
{
return new ZeroTier::Node::LocalClient(authToken,controlPort,resultHandler,arg);
}
void zeroTierDeleteLocalClient(ZeroTier::Node::LocalClient *lc)
{
delete lc;
}
} // extern "C"
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