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This commit is contained in:
Joseph Henry
2018-07-19 17:35:42 -07:00
parent 71fe3c867e
commit 60549bc8a3
74 changed files with 785 additions and 831 deletions
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examples/ztproxy/ztproxy.cpp Normal file
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/*
* ZeroTier SDK - Network Virtualization Everywhere
* Copyright (C) 2011-2017 ZeroTier, Inc. https://www.zerotier.com/
*
* 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/>.
*
* --
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial closed-source software that incorporates or links
* directly against ZeroTier software without disclosing the source code
* of your own application.
*/
#if defined(__linux__) || defined(__APPLE__)
#include <netdb.h>
#include <unistd.h>
#endif
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <fcntl.h>
#include <vector>
#include <algorithm>
#include <map>
#include "libzt.h"
#include "RingBuffer.h"
#include "ztproxy.hpp"
#if defined(_WIN32)
#include <time.h>
void sleep(unsigned long ms)
{
Sleep(ms);
}
#endif
namespace ZeroTier {
typedef void PhySocket;
ZTProxy::ZTProxy(int proxy_listen_port, std::string nwid, std::string path, std::string internal_addr,
int internal_port, std::string dns_nameserver)
:
_enabled(true),
_run(true),
_proxy_listen_port(proxy_listen_port),
_internal_port(internal_port),
_nwid(nwid),
_internal_addr(internal_addr),
_dns_nameserver(dns_nameserver),
_phy(this,false,true)
{
// Set up TCP listen sockets
// IPv4
struct sockaddr_in in4;
memset(&in4,0,sizeof(in4));
in4.sin_family = AF_INET;
in4.sin_addr.s_addr = Utils::hton((uint32_t)(0x7f000001)); // listen for TCP @127.0.0.1
in4.sin_port = Utils::hton((uint16_t)proxy_listen_port);
_tcpListenSocket = _phy.tcpListen((const struct sockaddr *)&in4,this);
if (!_tcpListenSocket) {
DEBUG_ERROR("Error binding on port %d for IPv4 HTTP listen socket", proxy_listen_port);
}
// IPv6
/*
struct sockaddr_in6 in6;
memset((void *)&in6,0,sizeof(in6));
in6.sin6_family = AF_INET6;
in6.sin6_port = in4.sin_port;
in6.sin6_addr.s6_addr[15] = 1; // IPv6 localhost == ::1
in6.sin6_port = Utils::hton((uint16_t)proxy_listen_port);
_tcpListenSocket6 = _phy.tcpListen((const struct sockaddr *)&in6,this);
*/
/*
if (!_tcpListenSocket6) {
DEBUG_ERROR("Error binding on port %d for IPv6 HTTP listen socket", proxy_listen_port);
}
*/
_thread = Thread::start(this);
}
ZTProxy::~ZTProxy()
{
_run = false;
_phy.whack();
Thread::join(_thread);
_phy.close(_tcpListenSocket,false);
_phy.close(_tcpListenSocket6,false);
}
void ZTProxy::threadMain()
throw()
{
// Add DNS nameserver
if (_dns_nameserver.length() > 0) {
DEBUG_INFO("setting DNS nameserver (%s)", _dns_nameserver.c_str());
struct sockaddr_in dns_address;
dns_address.sin_addr.s_addr = inet_addr(_dns_nameserver.c_str());
zts_add_dns_nameserver((struct sockaddr*)&dns_address);
}
TcpConnection *conn = NULL;
uint32_t msecs = 1;
struct timeval tv;
tv.tv_sec = msecs / 1000;
tv.tv_usec = (msecs % 1000) * 1000;
int ret = 0;
// Main I/O loop
// Moves data between client application socket and libzt VirtualSocket
while(_run) {
_phy.poll(1);
conn_m.lock();
// build fd_sets to select upon
FD_ZERO(&read_set);
FD_ZERO(&write_set);
nfds = 0;
for (size_t i=0; i<clist.size(); i++) {
FD_SET(clist[i]->zfd, &read_set);
FD_SET(clist[i]->zfd, &write_set);
nfds = clist[i]->zfd > nfds ? clist[i]->zfd : nfds;
}
ret = zts_select(nfds + 1, &read_set, &write_set, NULL, &tv);
if (ret > 0) {
for (int fd_i=0; fd_i<nfds+1; fd_i++) { // I/O needs to be handled on at least one fd
// RX, Handle data incoming from libzt
if (FD_ISSET(fd_i, &read_set)) {
int wr = 0, rd = 0;
conn = zmap[fd_i];
if (conn == NULL) {
DEBUG_ERROR("invalid conn");
exit(0);
}
// read data from libzt and place it on ring buffer
conn->rx_m.lock();
if (conn->RXbuf->count() > 0) {
//DEBUG_INFO("libzt has incoming data on fd=%d, RXing via conn=%p, sock=%p",
// conn->zfd, conn, conn->client_sock);
}
if ((rd = zts_read(conn->zfd, conn->RXbuf->get_buf(),ZT_MAX_MTU)) < 0) {
DEBUG_ERROR("error while reading data from libzt, err=%d", rd);
}
else {
//DEBUG_INFO("LIBZT -> RXBUFFER = %d bytes", rd);
conn->RXbuf->produce(rd);
}
// attempt to write data to client from buffer
if ((wr = _phy.streamSend(conn->client_sock, conn->RXbuf->get_buf(), conn->RXbuf->count())) < 0) {
DEBUG_ERROR("error while writing the data from the RXbuf to the client PhySocket, err=%d", wr);
}
else {
//DEBUG_INFO("RXBUFFER -> CLIENT = %d bytes", wr);
conn->RXbuf->consume(wr);
}
conn->rx_m.unlock();
}
// TX, Handle data outgoing from client to libzt
if (FD_ISSET(fd_i, &write_set)) {
int wr = 0;
conn = zmap[fd_i];
if (conn == NULL) {
DEBUG_ERROR("invalid conn, possibly closed before transmit was possible");
}
// read data from client and place it on ring buffer
conn->tx_m.lock();
if (conn->TXbuf->count() > 0) {
// DEBUG_INFO("client has outgoing data of len=%d on fd=%d, TXing via conn=%p, sock=%p",
// conn->TXbuf->count(), conn->zfd, conn, conn->client_sock);
if ((wr = zts_write(conn->zfd, conn->TXbuf->get_buf(), conn->TXbuf->count())) < 0) {
DEBUG_ERROR("error while sending the data over libzt, err=%d", wr);
}
else {
//DEBUG_INFO("TXBUFFER -> LIBZT = %d bytes", wr);
conn->TXbuf->consume(wr); // data is presumed sent, mark it as such in the ringbuffer
}
}
conn->tx_m.unlock();
}
}
}
conn_m.unlock();
}
}
bool isValidIPAddress(const char *ip)
{
struct sockaddr_in sa;
return inet_pton(AF_INET, ip, &(sa.sin_addr)) == 1;
}
void ZTProxy::phyOnTcpData(PhySocket *sock, void **uptr, void *data, unsigned long len)
{
int wr = 0, zfd = -1, err = 0;
DEBUG_EXTRA("sock=%p, len=%lu", sock, len);
std::string host = _internal_addr;
TcpConnection *conn = cmap[sock];
if (conn == NULL) {
DEBUG_ERROR("invalid conn");
exit(0);
}
if (conn->zfd < 0) { // no connection yet
if (host == "") {
DEBUG_ERROR("invalid hostname or address (empty)");
return;
}
DEBUG_INFO("establishing proxy connection...");
uint16_t dest_port, ipv;
dest_port = _internal_port;
host = _internal_addr;
if (isValidIPAddress(host.c_str()) == false) {
// try to resolve this if it isn't an IP address
struct hostent *h = zts_gethostbyname(host.c_str());
if (h == NULL) {
DEBUG_ERROR("unable to resolve hostname (%s) (errno=%d)", host.c_str(), errno);
return;
}
// TODO
// host = h->h_addr_list[0];
}
// determine address type
ipv = host.find(":") != std::string::npos ? 6 : 4;
// connect to remote host
if (ipv == 4) {
DEBUG_INFO("attempting to proxy [0.0.0.0:%d -> %s:%d]", _proxy_listen_port, host.c_str(), dest_port);
struct sockaddr_in in4;
memset(&in4,0,sizeof(in4));
in4.sin_family = AF_INET;
in4.sin_addr.s_addr = inet_addr(host.c_str());
in4.sin_port = Utils::hton(dest_port);
if ((zfd = zts_socket(AF_INET, SOCK_STREAM, 0)) < 0) {
DEBUG_ERROR("unable to create socket (errno=%d)", errno);
return;
}
if ((err = zts_connect(zfd, (const struct sockaddr *)&in4, sizeof(in4))) < 0) {
DEBUG_ERROR("unable to connect to remote host (errno=%d)", errno);
return;
}
}
if (ipv == 6) {
//DEBUG_INFO("attempting to proxy [0.0.0.0:%d -> %s:%d]", _proxy_listen_port, host.c_str(), dest_port);
/*
struct sockaddr_in6 in6;
memset(&in6,0,sizeof(in6));
in6.sin6_family = AF_INET;
struct hostent *server;
server = gethostbyname2((char*)host.c_str(),AF_INET6);
memmove((char *) &in6.sin6_addr.s6_addr, (char *) server->h_addr, server->h_length);
in6.sin6_port = Utils::hton(dest_port);
zfd = zts_socket(AF_INET, SOCK_STREAM, 0);
err = zts_connect(zfd, (const struct sockaddr *)&in6, sizeof(in6));
*/
}
if (zfd < 0 || err < 0) {
// now release TX buffer contents we previously saved, since we can't connect
DEBUG_ERROR("error while connecting to remote host (zfd=%d, err=%d)", zfd, err);
conn->tx_m.lock();
conn->TXbuf->reset();
conn->tx_m.unlock();
return;
}
else {
DEBUG_INFO("successfully connected to remote host");
}
conn_m.lock();
// on success, add connection entry to map, set physock for later
clist.push_back(conn);
conn->zfd = zfd;
conn->client_sock = sock;
cmap[conn->client_sock] = conn;
zmap[zfd] = conn;
conn_m.unlock();
}
// Write data coming from client TCP connection to its TX buffer, later emptied into libzt by threadMain I/O loop
conn->tx_m.lock();
if ((wr = conn->TXbuf->write((const char *)data, len)) < 0) {
DEBUG_ERROR("there was an error while writing data from client to tx buffer, err=%d", wr);
}
else {
// DEBUG_INFO("CLIENT -> TXBUFFER = %d bytes", wr);
}
conn->tx_m.unlock();
}
void ZTProxy::phyOnTcpAccept(PhySocket *sockL, PhySocket *sockN, void **uptrL, void **uptrN,
const struct sockaddr *from)
{
DEBUG_INFO("sockL=%p, sockN=%p", sockL, sockN);
TcpConnection *conn = new TcpConnection();
conn->client_sock = sockN;
cmap[sockN]=conn;
}
void ZTProxy::phyOnTcpClose(PhySocket *sock, void **uptr)
{
DEBUG_INFO("sock=%p", sock);
conn_m.lock();
TcpConnection *conn = cmap[sock];
if (conn) {
conn->client_sock=NULL;
if (conn->zfd >= 0) {
zts_close(conn->zfd);
}
cmap.erase(sock);
for (size_t i=0; i<clist.size(); i++) {
if (conn == clist[i]) {
clist.erase(clist.begin()+i);
break;
}
}
zmap[conn->zfd] = NULL;
delete conn;
conn = NULL;
}
#if defined(_WIN32)
closesocket(_phy.getDescriptor(sock));
#else
close(_phy.getDescriptor(sock));
#endif
conn_m.unlock();
}
void ZTProxy::phyOnDatagram(PhySocket *sock, void **uptr, const struct sockaddr *localAddr,
const struct sockaddr *from, void *data, unsigned long len) {
DEBUG_INFO();
}
void ZTProxy::phyOnTcpWritable(PhySocket *sock, void **uptr) {
DEBUG_INFO();
}
void ZTProxy::phyOnFileDescriptorActivity(PhySocket *sock, void **uptr, bool readable, bool writable) {
DEBUG_INFO("sock=%p", sock);
}
void ZTProxy::phyOnTcpConnect(PhySocket *sock, void **uptr, bool success) {
DEBUG_INFO("sock=%p", sock);
}
void ZTProxy::phyOnUnixClose(PhySocket *sock, void **uptr) {
DEBUG_INFO("sock=%p", sock);
}
void ZTProxy::phyOnUnixData(PhySocket *sock,void **uptr,void *data,ssize_t len) {
DEBUG_INFO("sock=%p, len=%lu", sock, len);
}
void ZTProxy::phyOnUnixWritable(PhySocket *sock, void **uptr, bool lwip_invoked) {
DEBUG_INFO("sock=%p", sock);
}
}
int main(int argc, char **argv)
{
if (argc < 6 || argc > 7) {
printf("\nZeroTier TCP Proxy Service\n");
printf("ztproxy [config_file_path] [local_listen_port] [nwid] [zt_host_addr] [zt_resource_port] [optional_dns_nameserver]\n");
exit(0);
}
std::string path = argv[1];
int proxy_listen_port = atoi(argv[2]);
std::string nwidstr = argv[3];
std::string internal_addr = argv[4];
int internal_port = atoi(argv[5]);
std::string dns_nameserver= "";//argv[6];
// Start ZeroTier Node
// Join Network which contains resources we need to proxy
DEBUG_INFO("waiting for libzt to come online");
uint64_t nwid = strtoull(nwidstr.c_str(),NULL,16);
zts_startjoin(path.c_str(), nwid);
ZeroTier::ZTProxy *proxy = new ZeroTier::ZTProxy(proxy_listen_port, nwidstr, path, internal_addr, internal_port, dns_nameserver);
if (proxy) {
printf("\nZTProxy started. Listening on %d\n", proxy_listen_port);
printf("Traffic will be proxied to and from %s:%d on network %s\n", internal_addr.c_str(), internal_port, nwidstr.c_str());
printf("Proxy Node config files and key stored in: %s/\n\n", path.c_str());
while(1) {
sleep(1);
}
}
else {
printf("unable to create proxy\n");
}
return 0;
}