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ZeroTierOne/netconf-service/netconf.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/
*/
/*
* This is the netconf service. It's currently used only by netconf nodes that
* are run by ZeroTier itself. There is nothing to prevent you from running
* your own if you wanted to create your own networks outside our system.
*
* That being said, we'd like to charge for private networks to support
* ZeroTier One and future development efforts. So while this software is
* open source and we're not going to stop you from sidestepping this, we
* do ask -- honor system here -- that you pay for private networks if you
* are going to use them for any commercial purpose such as a business VPN
* alternative.
*
* This will at the moment only build on Linux and requires the mysql++
* library, which is available here:
*
* http://tangentsoft.net/mysql++/
*
* (Packages are available for CentOS via EPEL and for any Debian distro.)
*
* This program must be built and installed in the services.d subfolder of
* the ZeroTier One home folder of the node designated to act as a master
* for networks. Doing so will enable the NETWORK_CONFIG_REQUEST protocol
* verb.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <iostream>
#include <string>
#include <map>
#include <list>
#include <vector>
#include <algorithm>
#include <mysql++/mysql++.h>
#include "../node/Dictionary.hpp"
#include "../node/Identity.hpp"
#include "../node/Utils.hpp"
#include "../node/Mutex.hpp"
#include "../node/NetworkConfig.hpp"
using namespace ZeroTier;
using namespace mysqlpp;
static Mutex stdoutWriteLock;
static Connection *dbCon = (Connection *)0;
static char mysqlHost[64],mysqlPort[64],mysqlDatabase[64],mysqlUser[64],mysqlPassword[64];
int main(int argc,char **argv)
{
{
char *ee = getenv("ZT_NETCONF_MYSQL_HOST");
if (!ee) {
fprintf(stderr,"missing environment variable: ZT_NETCONF_MYSQL_HOST\n");
return -1;
}
strcpy(mysqlHost,ee);
ee = getenv("ZT_NETCONF_MYSQL_PORT");
if (!ee)
strcpy(mysqlPort,"3306");
else strcpy(mysqlPort,ee);
ee = getenv("ZT_NETCONF_MYSQL_DATABASE");
if (!ee) {
fprintf(stderr,"missing environment variable: ZT_NETCONF_MYSQL_DATABASE\n");
return -1;
}
strcpy(mysqlDatabase,ee);
ee = getenv("ZT_NETCONF_MYSQL_USER");
if (!ee) {
fprintf(stderr,"missing environment variable: ZT_NETCONF_MYSQL_USER\n");
return -1;
}
strcpy(mysqlUser,ee);
ee = getenv("ZT_NETCONF_MYSQL_PASSWORD");
if (!ee) {
fprintf(stderr,"missing environment variable: ZT_NETCONF_MYSQL_PASSWORD\n");
return -1;
}
strcpy(mysqlPassword,ee);
}
char buf[131072],buf2[131072];
std::string dictBuf;
try {
dbCon = new Connection(mysqlDatabase,mysqlHost,mysqlUser,mysqlPassword,(unsigned int)strtol(mysqlPort,(char **)0,10));
if (dbCon->connected()) {
fprintf(stderr,"connected to mysql server successfully\n");
} else {
fprintf(stderr,"unable to connect to database server\n");
return -1;
}
} catch (std::exception &exc) {
fprintf(stderr,"unable to connect to database server: %s\n",exc.what());
return -1;
}
for(;;) {
for(int l=0;l<4;) {
int n = (int)read(STDIN_FILENO,buf + l,4 - l);
if (n < 0) {
fprintf(stderr,"error reading frame size from stdin: %s\n",strerror(errno));
return -1;
}
l += n;
}
unsigned int fsize = (unsigned int)ntohl(*((const uint32_t *)buf));
while (dictBuf.length() < fsize) {
int n = (int)read(STDIN_FILENO,buf,std::min((int)sizeof(buf),(int)(fsize - dictBuf.length())));
if (n < 0) {
fprintf(stderr,"error reading frame from stdin: %s\n",strerror(errno));
return -1;
}
for(int i=0;i<n;++i)
dictBuf.push_back(buf[i]);
}
Dictionary request(dictBuf);
dictBuf = "";
if (!dbCon->connected()) {
fprintf(stderr,"connection to database server lost\n");
return -1;
}
// Check QNetworkConfigRefresh (MEMORY table) and push network
// config refreshes to queued peer/network pairs.
try {
Dictionary to;
{
Query q = dbCon->query();
q << "SELECT DISTINCT LOWER(HEX(Node_id)) AS Node_id,LOWER(HEX(Network_id)) AS Network_id FROM QNetworkConfigRefresh";
StoreQueryResult rs = q.store();
for(unsigned long i=0;i<rs.num_rows();++i) {
std::string &nwids = to[rs[i]["Node_id"].c_str()];
if (nwids.length())
nwids.push_back(',');
nwids.append(rs[i]["Network_id"]);
}
}
{
Query q = dbCon->query();
q << "DELETE FROM QNetworkConfigRefresh";
q.exec();
}
Dictionary response;
response["type"] = "netconf-push";
response["to"] = to.toString();
std::string respm = response.toString();
uint32_t respml = (uint32_t)htonl((uint32_t)respm.length());
stdoutWriteLock.lock();
write(STDOUT_FILENO,&respml,4);
write(STDOUT_FILENO,respm.data(),respm.length());
stdoutWriteLock.unlock();
} catch ( ... ) {}
try {
const std::string &reqType = request.get("type");
if (reqType == "netconf-request") { // NETWORK_CONFIG_REQUEST packet
// Deserialize querying peer identity and network ID
Identity peerIdentity(request.get("peerId"));
uint64_t nwid = strtoull(request.get("nwid").c_str(),(char **)0,16);
std::string fromAddr(request.get("from",""));
// Meta-information from node, such as (future) geo-location stuff
Dictionary meta;
if (request.contains("meta"))
meta.fromString(request.get("meta"));
// Check validity of node's identity, ignore request on failure
if (!peerIdentity.locallyValidate()) {
fprintf(stderr,"identity failed validity check: %s\n",peerIdentity.toString(false).c_str());
continue;
}
// Save node's identity if unknown
{
Query q = dbCon->query();
q << "SELECT identity FROM Node WHERE id = " << peerIdentity.address().toInt();
StoreQueryResult rs = q.store();
if (rs.num_rows() > 0) {
if (rs[0]["identity"] != peerIdentity.toString(false)) {
// TODO: handle collisions...
continue;
}
} else {
q = dbCon->query();
q << "INSERT INTO Node (id,creationTime,lastSeen,identity) VALUES (" << peerIdentity.address().toInt() << "," << Utils::now() << ",0," << quote << peerIdentity.toString(false) << ")";
if (!q.exec()) {
fprintf(stderr,"error inserting Node row for peer %s, aborting netconf request\n",peerIdentity.address().toString().c_str());
continue;
}
// TODO: launch background validation
}
}
// Update lastSeen for Node, which is always updated on a netconf request
{
Query q = dbCon->query();
q << "UPDATE Node SET lastSeen = " << Utils::now() << " WHERE id = " << peerIdentity.address().toInt();
q.exec();
}
// Look up core network information
bool isOpen = false;
unsigned int multicastPrefixBits = 0;
unsigned int multicastDepth = 0;
bool emulateArp = false;
bool emulateNdp = false;
unsigned int arpCacheTtl = 0;
unsigned int ndpCacheTtl = 0;
std::string name;
std::string desc;
{
Query q = dbCon->query();
q << "SELECT name,`desc`,isOpen,multicastPrefixBits,multicastDepth,emulateArp,emulateNdp,arpCacheTtl,ndpCacheTtl FROM Network WHERE id = " << nwid;
StoreQueryResult rs = q.store();
if (rs.num_rows() > 0) {
name = rs[0]["name"].c_str();
desc = rs[0]["desc"].c_str();
isOpen = ((int)rs[0]["isOpen"] > 0);
emulateArp = ((int)rs[0]["emulateArp"] > 0);
emulateNdp = ((int)rs[0]["emulateNdp"] > 0);
arpCacheTtl = (unsigned int)rs[0]["arpCacheTtl"];
ndpCacheTtl = (unsigned int)rs[0]["ndpCacheTtl"];
multicastPrefixBits = (unsigned int)rs[0]["multicastPrefixBits"];
multicastDepth = (unsigned int)rs[0]["multicastDepth"];
} else {
Dictionary response;
response["peer"] = peerIdentity.address().toString();
response["nwid"] = request.get("nwid");
response["type"] = "netconf-response";
response["requestId"] = request.get("requestId");
response["error"] = "OBJ_NOT_FOUND";
std::string respm = response.toString();
uint32_t respml = (uint32_t)htonl((uint32_t)respm.length());
stdoutWriteLock.lock();
write(STDOUT_FILENO,&respml,4);
write(STDOUT_FILENO,respm.data(),respm.length());
stdoutWriteLock.unlock();
continue; // ABORT, wait for next request
}
}
// Check membership if this is a closed network
if (!isOpen) {
Query q = dbCon->query();
q << "SELECT Node_id FROM NetworkNodes WHERE Network_id = " << nwid << " AND Node_id = " << peerIdentity.address().toInt();
StoreQueryResult rs = q.store();
if (!rs.num_rows()) {
Dictionary response;
response["peer"] = peerIdentity.address().toString();
response["nwid"] = request.get("nwid");
response["type"] = "netconf-response";
response["requestId"] = request.get("requestId");
response["error"] = "ACCESS_DENIED";
std::string respm = response.toString();
uint32_t respml = (uint32_t)htonl((uint32_t)respm.length());
stdoutWriteLock.lock();
write(STDOUT_FILENO,&respml,4);
write(STDOUT_FILENO,respm.data(),respm.length());
stdoutWriteLock.unlock();
continue; // ABORT, wait for next request
}
}
// Get list of etherTypes in comma-delimited hex format
std::string etherTypeWhitelist;
{
Query q = dbCon->query();
q << "SELECT DISTINCT LOWER(HEX(etherType)) AS etherType FROM NetworkEthertypes WHERE Network_id = " << nwid;
StoreQueryResult rs = q.store();
for(unsigned long i=0;i<rs.num_rows();++i) {
if (etherTypeWhitelist.length() > 0)
etherTypeWhitelist.push_back(',');
etherTypeWhitelist.append(rs[i]["etherType"].c_str());
}
}
// Get multicast group rates in dictionary format
Dictionary multicastRates;
{
Query q = dbCon->query();
q << "SELECT DISTINCT multicastGroupMac,multicastGroupAdi,preload,maxBalance,accrual FROM NetworkMulticastRates WHERE Network_id = " << nwid;
StoreQueryResult rs = q.store();
for(unsigned long i=0;i<rs.num_rows();++i) {
unsigned long preload = (unsigned long)rs[i]["preload"];
unsigned long maxBalance = (unsigned long)rs[i]["maxBalance"];
unsigned long accrual = (unsigned long)rs[i]["accrual"];
unsigned long long mac = (unsigned long long)rs[i]["multicastGroupMac"];
sprintf(buf,"%.12llx/%lx",(mac & 0xffffffffffffULL),(unsigned long)rs[i]["multicastGroupAdi"]);
sprintf(buf2,"%lx,%lx,%lx",preload,maxBalance,accrual);
multicastRates[buf] = buf2;
}
}
// Check for (or assign?) static IP address assignments
std::string ipv4Static;
std::string ipv6Static;
{
Query q = dbCon->query();
q << "SELECT INET_NTOA(ip) AS ip,netmaskBits FROM IPv4Static WHERE Node_id = " << peerIdentity.address().toInt() << " AND Network_id = " << nwid;
StoreQueryResult rs = q.store();
if (rs.num_rows() > 0) {
for(int i=0;i<rs.num_rows();++i) {
if (ipv4Static.length())
ipv4Static.push_back(',');
ipv4Static.append(rs[i]["ip"].c_str());
ipv4Static.push_back('/');
ipv4Static.append(rs[i]["netmaskBits"].c_str());
}
}
// Try to auto-assign if there's any auto-assign networks with space
// available.
if (!ipv4Static.length()) {
unsigned char addressBytes[5];
peerIdentity.address().copyTo(addressBytes,5);
q = dbCon->query();
q << "SELECT ipNet,netmaskBits FROM IPv4AutoAssign WHERE Network_id = " << nwid;
rs = q.store();
if (rs.num_rows() > 0) {
for(int aaRow=0;aaRow<rs.num_rows();++aaRow) {
uint32_t ipNet = (uint32_t)((unsigned long)rs[aaRow]["ipNet"]);
unsigned int netmaskBits = (unsigned int)rs[aaRow]["netmaskBits"];
uint32_t tryIp = (((uint32_t)addressBytes[1]) << 24) |
(((uint32_t)addressBytes[2]) << 16) |
(((uint32_t)addressBytes[3]) << 8) |
((((uint32_t)addressBytes[4]) % 254) + 1);
tryIp &= (0xffffffff >> netmaskBits);
tryIp |= ipNet;
for(int k=0;k<100000;++k) {
Query q2 = dbCon->query();
q2 << "INSERT INTO IPv4Static (Network_id,Node_id,ip,netmaskBits) VALUES (" << nwid << "," << peerIdentity.address().toInt() << "," << tryIp << "," << netmaskBits << ")";
if (q2.exec()) {
sprintf(buf,"%u.%u.%u.%u",(unsigned int)((tryIp >> 24) & 0xff),(unsigned int)((tryIp >> 16) & 0xff),(unsigned int)((tryIp >> 8) & 0xff),(unsigned int)(tryIp & 0xff));
if (ipv4Static.length())
ipv4Static.push_back(',');
ipv4Static.append(buf);
ipv4Static.push_back('/');
sprintf(buf,"%u",netmaskBits);
ipv4Static.append(buf);
break;
} else { // insert will fail if IP is in use due to uniqueness constraints in DB
++tryIp;
if ((tryIp & 0xff) == 0)
tryIp |= 1;
tryIp &= (0xffffffff >> netmaskBits);
tryIp |= ipNet;
}
}
if (ipv4Static.length())
break;
}
}
}
}
// Update activity table for this network to indicate peer's participation
{
if (fromAddr.length()) {
Query q = dbCon->query();
q << "INSERT INTO NetworkActivity (Network_id,Node_id,lastActivityTime,lastActivityFrom) VALUES (" << nwid << "," << peerIdentity.address().toInt() << "," << Utils::now() << "," << quote << fromAddr << ") ON DUPLICATE KEY UPDATE lastActivityTime = VALUES(lastActivityTime),lastActivityFrom = VALUES(lastActivityFrom)";
q.exec();
} else {
Query q = dbCon->query();
q << "INSERT INTO NetworkActivity (Network_id,Node_id,lastActivityTime) VALUES (" << nwid << "," << peerIdentity.address().toInt() << "," << Utils::now() << ") ON DUPLICATE KEY UPDATE lastActivityTime = VALUES(lastActivityTime)";
q.exec();
}
}
// Assemble response dictionary to send to peer
Dictionary netconf;
sprintf(buf,"%.16llx",(unsigned long long)nwid);
netconf[ZT_NETWORKCONFIG_DICT_KEY_NETWORK_ID] = buf;
netconf[ZT_NETWORKCONFIG_DICT_KEY_ISSUED_TO] = peerIdentity.address().toString();
netconf[ZT_NETWORKCONFIG_DICT_KEY_NAME] = name;
netconf[ZT_NETWORKCONFIG_DICT_KEY_DESC] = desc;
netconf[ZT_NETWORKCONFIG_DICT_KEY_IS_OPEN] = (isOpen ? "1" : "0");
netconf[ZT_NETWORKCONFIG_DICT_KEY_ALLOWED_ETHERNET_TYPES] = etherTypeWhitelist;
netconf[ZT_NETWORKCONFIG_DICT_KEY_MULTICAST_RATES] = multicastRates.toString();
sprintf(buf,"%llx",(unsigned long long)Utils::now());
netconf[ZT_NETWORKCONFIG_DICT_KEY_TIMESTAMP] = buf;
netconf[ZT_NETWORKCONFIG_DICT_KEY_EMULATE_ARP] = (emulateArp ? "1" : "0");
netconf[ZT_NETWORKCONFIG_DICT_KEY_EMULATE_NDP] = (emulateNdp ? "1" : "0");
if (arpCacheTtl) {
sprintf(buf,"%x",arpCacheTtl);
netconf[ZT_NETWORKCONFIG_DICT_KEY_ARP_CACHE_TTL] = buf;
}
if (ndpCacheTtl) {
sprintf(buf,"%x",ndpCacheTtl);
netconf[ZT_NETWORKCONFIG_DICT_KEY_NDP_CACHE_TTL] = buf;
}
if (multicastPrefixBits) {
sprintf(buf,"%x",multicastPrefixBits);
netconf[ZT_NETWORKCONFIG_DICT_KEY_MULTICAST_PREFIX_BITS] = buf;
}
if (multicastDepth) {
sprintf(buf,"%x",multicastDepth);
netconf[ZT_NETWORKCONFIG_DICT_KEY_MULTICAST_DEPTH] = buf;
}
if (ipv4Static.length())
netconf[ZT_NETWORKCONFIG_DICT_KEY_IPV4_STATIC] = ipv4Static;
if (ipv6Static.length())
netconf[ZT_NETWORKCONFIG_DICT_KEY_IPV6_STATIC] = ipv6Static;
// Send netconf as service bus response
{
Dictionary response;
response["peer"] = peerIdentity.address().toString();
response["nwid"] = request.get("nwid");
response["type"] = "netconf-response";
response["requestId"] = request.get("requestId");
response["netconf"] = netconf.toString();
std::string respm = response.toString();
uint32_t respml = (uint32_t)htonl((uint32_t)respm.length());
stdoutWriteLock.lock();
write(STDOUT_FILENO,&respml,4);
write(STDOUT_FILENO,respm.data(),respm.length());
stdoutWriteLock.unlock();
// LOOP, wait for next request
}
}
} catch (std::exception &exc) {
fprintf(stderr,"unexpected exception handling message: %s\n",exc.what());
} catch ( ... ) {
fprintf(stderr,"unexpected exception handling message: unknown exception\n");
}
}
}
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