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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"
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];
static void connectOrReconnect()
{
for(;;) {
delete dbCon;
try {
dbCon = new Connection(mysqlDatabase,mysqlHost,mysqlUser,mysqlPassword,(unsigned int)strtol(mysqlPort,(char **)0,10));
if (dbCon->connected()) {
fprintf(stderr,"(re?)-connected to mysql server successfully\n");
break;
} else {
fprintf(stderr,"unable to connect to database server (connection closed), trying again in 1s...\n");
usleep(1000000);
}
} catch (std::exception &exc) {
fprintf(stderr,"unable to connect to database server (%s), trying again in 1s...\n",exc.what());
usleep(1000000);
} catch ( ... ) {
fprintf(stderr,"unable to connect to database server (unknown exception), trying again in 1s...\n");
usleep(1000000);
}
}
}
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];
std::string dictBuf;
connectOrReconnect();
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())
connectOrReconnect();
try {
const std::string &reqType = request.get("type");
if (reqType == "netconf-request") { // NETWORK_CONFIG_REQUEST packet
Identity peerIdentity(request.get("peerId"));
uint64_t nwid = strtoull(request.get("nwid").c_str(),(char **)0,16);
Dictionary meta;
if (request.contains("meta"))
meta.fromString(request.get("meta"));
// Do quick signature check / sanity check
if (!peerIdentity.locallyValidate(false)) {
fprintf(stderr,"identity failed signature check: %s\n",peerIdentity.toString(false).c_str());
continue;
}
// Save identity if unknown
{
Query q = dbCon->query();
q << "SELECT identity,identityValidated 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 if ((int)rs[0]["identityValidated"] == 0) {
// TODO: launch background validation
}
} 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
{
Query q = dbCon->query();
q << "UPDATE Node SET lastSeen = " << Utils::now() << " WHERE id = " << peerIdentity.address().toInt();
q.exec();
}
bool isOpen = false;
{
Query q = dbCon->query();
q << "SELECT isOpen FROM Network WHERE id = " << nwid;
StoreQueryResult rs = q.store();
if (rs.num_rows() > 0)
isOpen = ((int)rs[0]["isOpen"] > 0);
else {
Dictionary response;
response["peer"] = peerIdentity.address().toString();
response["nwid"] = request.get("nwid");
response["type"] = "netconf-response";
response["requestId"] = request.get("requestId");
response["error"] = "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;
}
}
Dictionary netconf;
netconf["peer"] = peerIdentity.address().toString();
sprintf(buf,"%.16llx",(unsigned long long)nwid);
netconf["nwid"] = buf;
netconf["isOpen"] = (isOpen ? "1" : "0");
sprintf(buf,"%llx",(unsigned long long)Utils::now());
netconf["ts"] = buf;
if (!isOpen) {
// TODO: handle closed networks, look up private membership,
// generate signed cert.
}
std::string ipv4Static,ipv6Static;
{
// Check for IPv4 static assignments
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;
}
}
}
}
if (ipv4Static.length())
netconf["ipv4Static"] = ipv4Static;
if (ipv6Static.length())
netconf["ipv6Static"] = ipv6Static;
{
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();
}
}
} 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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