net: Automatically create hidden service, listen on Tor
Starting with Tor version 0.2.7.1 it is possible, through Tor's control socket API, to create and destroy 'ephemeral' hidden services programmatically. https://stem.torproject.org/api/control.html#stem.control.Controller.create_ephemeral_hidden_service This means that if Tor is running (and proper authorization is available), bitcoin automatically creates a hidden service to listen on, without user manual configuration. This will positively affect the number of available .onion nodes. - When the node is started, connect to Tor through control socket - Send `ADD_ONION` command - First time: - Make it create a hidden service key - Save the key in the data directory for later usage - Make it redirect port 8333 to the local port 8333 (or whatever port we're listening on). - Keep control socket connection open for as long node is running. The hidden service will (by default) automatically go away when the connection is closed.
This commit is contained in:
Wladimir J. van der Laan
parent
b56953e9bb
commit
8f4e67f152
8 changed files with 611 additions and 4 deletions
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@ -149,6 +149,7 @@ BITCOIN_CORE_H = \
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threadsafety.h \
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timedata.h \
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tinyformat.h \
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torcontrol.h \
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txdb.h \
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txmempool.h \
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ui_interface.h \
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@ -206,6 +207,7 @@ libbitcoin_server_a_SOURCES = \
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rpcserver.cpp \
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script/sigcache.cpp \
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timedata.cpp \
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torcontrol.cpp \
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txdb.cpp \
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txmempool.cpp \
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validationinterface.cpp \
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@ -28,6 +28,7 @@
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#include "scheduler.h"
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#include "txdb.h"
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#include "txmempool.h"
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#include "torcontrol.h"
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#include "ui_interface.h"
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#include "util.h"
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#include "utilmoneystr.h"
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@ -187,6 +188,7 @@ void Shutdown()
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#endif
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GenerateBitcoins(false, 0, Params());
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StopNode();
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StopTorControl();
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UnregisterNodeSignals(GetNodeSignals());
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if (fFeeEstimatesInitialized)
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@ -347,6 +349,7 @@ std::string HelpMessage(HelpMessageMode mode)
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strUsage += HelpMessageOpt("-externalip=<ip>", _("Specify your own public address"));
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strUsage += HelpMessageOpt("-forcednsseed", strprintf(_("Always query for peer addresses via DNS lookup (default: %u)"), 0));
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strUsage += HelpMessageOpt("-listen", _("Accept connections from outside (default: 1 if no -proxy or -connect)"));
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strUsage += HelpMessageOpt("-listenonion", strprintf(_("Automatically create Tor hidden service (default: %d)"), DEFAULT_LISTEN_ONION));
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strUsage += HelpMessageOpt("-maxconnections=<n>", strprintf(_("Maintain at most <n> connections to peers (default: %u)"), DEFAULT_MAX_PEER_CONNECTIONS));
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strUsage += HelpMessageOpt("-maxreceivebuffer=<n>", strprintf(_("Maximum per-connection receive buffer, <n>*1000 bytes (default: %u)"), 5000));
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strUsage += HelpMessageOpt("-maxsendbuffer=<n>", strprintf(_("Maximum per-connection send buffer, <n>*1000 bytes (default: %u)"), 1000));
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@ -358,6 +361,7 @@ std::string HelpMessage(HelpMessageMode mode)
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strUsage += HelpMessageOpt("-proxyrandomize", strprintf(_("Randomize credentials for every proxy connection. This enables Tor stream isolation (default: %u)"), 1));
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strUsage += HelpMessageOpt("-seednode=<ip>", _("Connect to a node to retrieve peer addresses, and disconnect"));
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strUsage += HelpMessageOpt("-timeout=<n>", strprintf(_("Specify connection timeout in milliseconds (minimum: 1, default: %d)"), DEFAULT_CONNECT_TIMEOUT));
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strUsage += HelpMessageOpt("-torcontrol=<ip>:<port>", strprintf(_("Tor control port to use if onion listening enabled (default: %s)"), DEFAULT_TOR_CONTROL));
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#ifdef USE_UPNP
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#if USE_UPNP
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strUsage += HelpMessageOpt("-upnp", _("Use UPnP to map the listening port (default: 1 when listening and no -proxy)"));
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@ -777,6 +781,8 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
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LogPrintf("%s: parameter interaction: -listen=0 -> setting -upnp=0\n", __func__);
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if (SoftSetBoolArg("-discover", false))
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LogPrintf("%s: parameter interaction: -listen=0 -> setting -discover=0\n", __func__);
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if (SoftSetBoolArg("-listenonion", false))
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LogPrintf("%s: parameter interaction: -listen=0 -> setting -listenonion=0\n", __func__);
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}
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if (mapArgs.count("-externalip")) {
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@ -1567,6 +1573,9 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
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LogPrintf("mapAddressBook.size() = %u\n", pwalletMain ? pwalletMain->mapAddressBook.size() : 0);
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#endif
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if (GetBoolArg("-listenonion", DEFAULT_LISTEN_ONION))
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StartTorControl(threadGroup, scheduler);
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StartNode(threadGroup, scheduler);
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// Monitor the chain, and alert if we get blocks much quicker or slower than expected
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@ -4038,9 +4038,11 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
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CAddress addr = GetLocalAddress(&pfrom->addr);
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if (addr.IsRoutable())
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{
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LogPrintf("ProcessMessages: advertizing address %s\n", addr.ToString());
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pfrom->PushAddress(addr);
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} else if (IsPeerAddrLocalGood(pfrom)) {
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addr.SetIP(pfrom->addrLocal);
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LogPrintf("ProcessMessages: advertizing address %s\n", addr.ToString());
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pfrom->PushAddress(addr);
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}
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}
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@ -216,6 +216,7 @@ void AdvertizeLocal(CNode *pnode)
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}
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if (addrLocal.IsRoutable())
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{
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LogPrintf("AdvertizeLocal: advertizing address %s\n", addrLocal.ToString());
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pnode->PushAddress(addrLocal);
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}
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}
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@ -227,10 +227,7 @@ bool LookupNumeric(const char *pszName, CService& addr, int portDefault)
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return Lookup(pszName, addr, portDefault, false);
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}
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/**
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* Convert milliseconds to a struct timeval for select.
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*/
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struct timeval static MillisToTimeval(int64_t nTimeout)
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struct timeval MillisToTimeval(int64_t nTimeout)
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{
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struct timeval timeout;
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timeout.tv_sec = nTimeout / 1000;
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@ -215,5 +215,9 @@ std::string NetworkErrorString(int err);
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bool CloseSocket(SOCKET& hSocket);
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/** Disable or enable blocking-mode for a socket */
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bool SetSocketNonBlocking(SOCKET& hSocket, bool fNonBlocking);
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/**
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* Convert milliseconds to a struct timeval for e.g. select.
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*/
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struct timeval MillisToTimeval(int64_t nTimeout);
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#endif // BITCOIN_NETBASE_H
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573
src/torcontrol.cpp
Normal file
573
src/torcontrol.cpp
Normal file
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@ -0,0 +1,573 @@
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#include "torcontrol.h"
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#include "utilstrencodings.h"
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#include "net.h"
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#include "util.h"
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#include "init.h" // Just for ShutdownRequested
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#include <vector>
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#include <deque>
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#include <set>
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#include <stdlib.h>
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#include <boost/function.hpp>
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#include <boost/bind.hpp>
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#include <boost/signals2/signal.hpp>
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#include <boost/foreach.hpp>
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#include <boost/algorithm/string/predicate.hpp>
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#include <boost/algorithm/string/split.hpp>
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#include <boost/algorithm/string/classification.hpp>
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#include <event2/bufferevent.h>
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#include <event2/buffer.h>
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#include <event2/util.h>
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#include <event2/event.h>
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const std::string DEFAULT_TOR_CONTROL = "127.0.0.1:9051";
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/****** Low-level TorControlConnection ********/
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/** Reply from Tor, can be single or multi-line */
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class TorControlReply
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{
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public:
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TorControlReply() { Clear(); }
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int code;
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std::vector<std::string> lines;
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void Clear()
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{
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code = 0;
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lines.clear();
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}
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};
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/** Low-level handling for Tor control connection.
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* Speaks the SMTP-like protocol as defined in torspec/control-spec.txt
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*/
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class TorControlConnection
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{
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public:
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typedef boost::function<void(TorControlConnection&)> ConnectionCB;
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typedef boost::function<void(TorControlConnection &,const TorControlReply &)> ReplyHandlerCB;
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/** Create a new TorControlConnection.
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*/
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TorControlConnection(struct event_base *base);
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~TorControlConnection();
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/**
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* Connect to a Tor control port.
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* target is address of the form host:port.
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* connected is the handler that is called when connection is succesfully established.
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* disconnected is a handler that is called when the connection is broken.
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* Return true on success.
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*/
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bool Connect(const std::string &target, const ConnectionCB& connected, const ConnectionCB& disconnected);
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/**
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* Disconnect from Tor control port.
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*/
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bool Disconnect();
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/** Send a command, register a handler for the reply.
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* A trailing CRLF is automatically added.
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* Return true on success.
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*/
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bool Command(const std::string &cmd, const ReplyHandlerCB& reply_handler);
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/** Response handlers for async replies */
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boost::signals2::signal<void(TorControlConnection &,const TorControlReply &)> async_handler;
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private:
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/** Callback when ready for use */
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boost::function<void(TorControlConnection&)> connected;
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/** Callback when connection lost */
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boost::function<void(TorControlConnection&)> disconnected;
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/** Libevent event base */
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struct event_base *base;
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/** Connection to control socket */
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struct bufferevent *b_conn;
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/** Message being received */
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TorControlReply message;
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/** Response handlers */
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std::deque<ReplyHandlerCB> reply_handlers;
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/** Libevent handlers: internal */
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static void readcb(struct bufferevent *bev, void *ctx);
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static void eventcb(struct bufferevent *bev, short what, void *ctx);
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};
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TorControlConnection::TorControlConnection(struct event_base *base):
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base(base), b_conn(0)
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{
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}
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TorControlConnection::~TorControlConnection()
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{
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if (b_conn)
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bufferevent_free(b_conn);
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}
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void TorControlConnection::readcb(struct bufferevent *bev, void *ctx)
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{
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TorControlConnection *self = (TorControlConnection*)ctx;
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struct evbuffer *input = bufferevent_get_input(bev);
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size_t n_read_out = 0;
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char *line;
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assert(input);
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// If there is not a whole line to read, evbuffer_readln returns NULL
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while((line = evbuffer_readln(input, &n_read_out, EVBUFFER_EOL_CRLF)) != NULL)
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{
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std::string s(line, n_read_out);
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free(line);
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if (s.size() < 4) // Short line
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continue;
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// <status>(-|+| )<data><CRLF>
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self->message.code = atoi(s.substr(0,3).c_str());
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self->message.lines.push_back(s.substr(4));
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char ch = s[3]; // '-','+' or ' '
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if (ch == ' ') {
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// Final line, dispatch reply and clean up
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if (self->message.code >= 600) {
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// Dispatch async notifications to async handler
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// Synchronous and asynchronous messages are never interleaved
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self->async_handler(*self, self->message);
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} else {
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if (!self->reply_handlers.empty()) {
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// Invoke reply handler with message
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self->reply_handlers.front()(*self, self->message);
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self->reply_handlers.pop_front();
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} else {
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LogPrintf("[tor] Received unexpected sync reply %i\n", self->message.code);
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}
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}
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self->message.Clear();
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}
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}
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}
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void TorControlConnection::eventcb(struct bufferevent *bev, short what, void *ctx)
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{
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TorControlConnection *self = (TorControlConnection*)ctx;
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if (what & BEV_EVENT_CONNECTED) {
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LogPrintf("[tor] Succesfully connected!\n");
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self->connected(*self);
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} else if (what & (BEV_EVENT_EOF|BEV_EVENT_ERROR)) {
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if (what & BEV_EVENT_ERROR)
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LogPrintf("[tor] Error connecting to Tor control socket\n");
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else
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LogPrintf("[tor] End of stream\n");
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self->Disconnect();
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self->disconnected(*self);
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}
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}
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bool TorControlConnection::Connect(const std::string &target, const ConnectionCB& connected, const ConnectionCB& disconnected)
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{
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if (b_conn)
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Disconnect();
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// Parse target address:port
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struct sockaddr_storage connect_to_addr;
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int connect_to_addrlen = sizeof(connect_to_addr);
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if (evutil_parse_sockaddr_port(target.c_str(),
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(struct sockaddr*)&connect_to_addr, &connect_to_addrlen)<0) {
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perror("evutil_parse_sockaddr_port\n");
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return false;
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}
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// Create a new socket, set up callbacks and enable notification bits
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b_conn = bufferevent_socket_new(base, -1, BEV_OPT_CLOSE_ON_FREE);
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if (!b_conn)
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return false;
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bufferevent_setcb(b_conn, TorControlConnection::readcb, NULL, TorControlConnection::eventcb, this);
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bufferevent_enable(b_conn, EV_READ|EV_WRITE);
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this->connected = connected;
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this->disconnected = disconnected;
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// Finally, connect to target
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if (bufferevent_socket_connect(b_conn, (struct sockaddr*)&connect_to_addr, connect_to_addrlen) < 0) {
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perror("bufferevent_socket_connect");
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return false;
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}
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return true;
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}
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bool TorControlConnection::Disconnect()
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{
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if (b_conn)
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bufferevent_free(b_conn);
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b_conn = 0;
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return true;
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}
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bool TorControlConnection::Command(const std::string &cmd, const ReplyHandlerCB& reply_handler)
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{
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if (!b_conn)
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return false;
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struct evbuffer *buf = bufferevent_get_output(b_conn);
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if (!buf)
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return false;
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evbuffer_add(buf, cmd.data(), cmd.size());
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evbuffer_add(buf, "\r\n", 2);
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reply_handlers.push_back(reply_handler);
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return true;
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}
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/****** General parsing utilities ********/
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/* Split reply line in the form 'AUTH METHODS=...' into a type
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* 'AUTH' and arguments 'METHODS=...'.
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*/
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static std::pair<std::string,std::string> SplitTorReplyLine(const std::string &s)
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{
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size_t ptr=0;
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std::string type;
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while (ptr < s.size() && s[ptr] != ' ') {
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type.push_back(s[ptr]);
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++ptr;
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}
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if (ptr < s.size())
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++ptr; // skip ' '
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return make_pair(type, s.substr(ptr));
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}
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/** Parse reply arguments in the form 'METHODS=COOKIE,SAFECOOKIE COOKIEFILE=".../control_auth_cookie"'.
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*/
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static std::map<std::string,std::string> ParseTorReplyMapping(const std::string &s)
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{
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std::map<std::string,std::string> mapping;
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size_t ptr=0;
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while (ptr < s.size()) {
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std::string key, value;
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while (ptr < s.size() && s[ptr] != '=') {
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key.push_back(s[ptr]);
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++ptr;
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}
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if (ptr == s.size()) // unexpected end of line
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return std::map<std::string,std::string>();
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++ptr; // skip '='
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if (ptr < s.size() && s[ptr] == '"') { // Quoted string
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++ptr; // skip '='
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bool escape_next = false;
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while (ptr < s.size() && (!escape_next && s[ptr] != '"')) {
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escape_next = (s[ptr] == '\\');
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value.push_back(s[ptr]);
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++ptr;
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}
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if (ptr == s.size()) // unexpected end of line
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return std::map<std::string,std::string>();
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++ptr; // skip closing '"'
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/* TODO: unescape value - according to the spec this depends on the
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* context, some strings use C-LogPrintf style escape codes, some
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* don't. So may be better handled at the call site.
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*/
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} else { // Unquoted value. Note that values can contain '=' at will, just no spaces
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while (ptr < s.size() && s[ptr] != ' ') {
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value.push_back(s[ptr]);
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++ptr;
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}
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}
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if (ptr < s.size() && s[ptr] == ' ')
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++ptr; // skip ' ' after key=value
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mapping[key] = value;
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}
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return mapping;
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}
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/** Read full contents of a file and return them in a std::string. */
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static std::pair<bool,std::string> ReadBinaryFile(const std::string &filename)
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{
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FILE *f = fopen(filename.c_str(), "rb");
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if (f == NULL)
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return std::make_pair(false,"");
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std::string retval;
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char buffer[128];
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size_t n;
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while ((n=fread(buffer, 1, sizeof(buffer), f)) > 0)
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retval.append(buffer, buffer+n);
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fclose(f);
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return std::make_pair(true,retval);
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}
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/** Write contents of std::string to a file.
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* @return true on success.
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*/
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static bool WriteBinaryFile(const std::string &filename, const std::string &data)
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{
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FILE *f = fopen(filename.c_str(), "wb");
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if (f == NULL)
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return false;
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if (fwrite(data.data(), 1, data.size(), f) != data.size())
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return false;
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fclose(f);
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return true;
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}
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/****** Bitcoin specific TorController implementation ********/
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/** Controller that connects to Tor control socket, authenticate, then create
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* and maintain a ephemeral hidden service.
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*/
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class TorController
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{
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public:
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TorController(struct event_base* base, const std::string& target);
|
||||
~TorController();
|
||||
|
||||
/** Get name fo file to store private key in */
|
||||
std::string GetPrivateKeyFile();
|
||||
|
||||
/** Reconnect, after getting disconnected */
|
||||
void Reconnect();
|
||||
private:
|
||||
struct event_base* base;
|
||||
std::string target;
|
||||
TorControlConnection conn;
|
||||
std::string private_key;
|
||||
std::string service_id;
|
||||
bool reconnect;
|
||||
struct event *shutdown_poll_ev;
|
||||
struct event *reconnect_ev;
|
||||
float reconnect_timeout;
|
||||
|
||||
/** Callback for ADD_ONION result */
|
||||
void add_onion_cb(TorControlConnection& conn, const TorControlReply& reply);
|
||||
/** Callback for AUTHENTICATE result */
|
||||
void auth_cb(TorControlConnection& conn, const TorControlReply& reply);
|
||||
/** Callback for PROTOCOLINFO result */
|
||||
void protocolinfo_cb(TorControlConnection& conn, const TorControlReply& reply);
|
||||
/** Callback after succesful connection */
|
||||
void connected_cb(TorControlConnection& conn);
|
||||
/** Callback after connection lost or failed connection attempt */
|
||||
void disconnected_cb(TorControlConnection& conn);
|
||||
|
||||
/** Callback for shutdown poll timer */
|
||||
static void shutdown_poll_cb(evutil_socket_t fd, short what, void *arg);
|
||||
/** Callback for reconnect timer */
|
||||
static void reconnect_cb(evutil_socket_t fd, short what, void *arg);
|
||||
};
|
||||
|
||||
/** Exponential backoff configuration - initial timeout in seconds */
|
||||
static const float RECONNECT_TIMEOUT_START = 1.0;
|
||||
/** Exponential backoff configuration - growth factor */
|
||||
static const float RECONNECT_TIMEOUT_EXP = 1.5;
|
||||
|
||||
TorController::TorController(struct event_base* base, const std::string& target):
|
||||
base(base),
|
||||
target(target), conn(base), reconnect(true), shutdown_poll_ev(0), reconnect_ev(0),
|
||||
reconnect_timeout(RECONNECT_TIMEOUT_START)
|
||||
{
|
||||
// Start connection attempts immediately
|
||||
if (!conn.Connect(target, boost::bind(&TorController::connected_cb, this, _1),
|
||||
boost::bind(&TorController::disconnected_cb, this, _1) )) {
|
||||
LogPrintf("[tor] Initiating connection to Tor control port %s failed\n", target);
|
||||
}
|
||||
// Read service private key if cached
|
||||
std::pair<bool,std::string> pkf = ReadBinaryFile(GetPrivateKeyFile());
|
||||
if (pkf.first) {
|
||||
LogPrintf("[tor] Reading cached private key from %s\n", GetPrivateKeyFile());
|
||||
private_key = pkf.second;
|
||||
}
|
||||
// Periodic timer event to poll for shutdown
|
||||
// The same 200ms as in bitcoind. This is not the nicest solution, but we cannot exactly use
|
||||
// boost::interrupt here.
|
||||
struct timeval time;
|
||||
time.tv_usec = 200000;
|
||||
time.tv_sec = 0;
|
||||
shutdown_poll_ev = event_new(base, -1, EV_PERSIST, shutdown_poll_cb, this);
|
||||
event_add(shutdown_poll_ev, &time);
|
||||
}
|
||||
|
||||
TorController::~TorController()
|
||||
{
|
||||
if (shutdown_poll_ev)
|
||||
event_del(shutdown_poll_ev);
|
||||
if (reconnect_ev)
|
||||
event_del(reconnect_ev);
|
||||
}
|
||||
|
||||
void TorController::add_onion_cb(TorControlConnection& conn, const TorControlReply& reply)
|
||||
{
|
||||
if (reply.code == 250) {
|
||||
LogPrintf("[tor] ADD_ONION succesful\n");
|
||||
BOOST_FOREACH(const std::string &s, reply.lines) {
|
||||
std::map<std::string,std::string> m = ParseTorReplyMapping(s);
|
||||
std::map<std::string,std::string>::iterator i;
|
||||
if ((i = m.find("ServiceID")) != m.end())
|
||||
service_id = i->second;
|
||||
if ((i = m.find("PrivateKey")) != m.end())
|
||||
private_key = i->second;
|
||||
}
|
||||
|
||||
CService service(service_id+".onion", GetListenPort(), false);
|
||||
LogPrintf("[tor] Got service ID %s, advertizing service %s\n", service_id, service.ToString());
|
||||
if (WriteBinaryFile(GetPrivateKeyFile(), private_key)) {
|
||||
LogPrintf("[tor] Cached service private key to %s\n", GetPrivateKeyFile());
|
||||
} else {
|
||||
LogPrintf("[tor] Error writing service private key to %s\n", GetPrivateKeyFile());
|
||||
}
|
||||
AddLocal(service, LOCAL_MANUAL);
|
||||
// ... onion requested - keep connection open
|
||||
} else {
|
||||
LogPrintf("[tor] Add onion failed\n");
|
||||
}
|
||||
}
|
||||
|
||||
void TorController::auth_cb(TorControlConnection& conn, const TorControlReply& reply)
|
||||
{
|
||||
if (reply.code == 250) {
|
||||
LogPrintf("[tor] Authentication succesful\n");
|
||||
// Finally - now create the service
|
||||
if (private_key.empty()) // No private key, generate one
|
||||
private_key = "NEW:BEST";
|
||||
// Request hidden service, redirect port.
|
||||
// Note that the 'virtual' port doesn't have to be the same as our internal port, but this is just a convenient
|
||||
// choice. TODO; refactor the shutdown sequence some day.
|
||||
conn.Command(strprintf("ADD_ONION %s Port=%i,127.0.0.1:%i", private_key, GetListenPort(), GetListenPort()),
|
||||
boost::bind(&TorController::add_onion_cb, this, _1, _2));
|
||||
} else {
|
||||
LogPrintf("[tor] Authentication failed\n");
|
||||
}
|
||||
}
|
||||
|
||||
void TorController::protocolinfo_cb(TorControlConnection& conn, const TorControlReply& reply)
|
||||
{
|
||||
if (reply.code == 250) {
|
||||
std::set<std::string> methods;
|
||||
std::string cookiefile;
|
||||
/*
|
||||
* 250-AUTH METHODS=COOKIE,SAFECOOKIE COOKIEFILE="/home/x/.tor/control_auth_cookie"
|
||||
* 250-AUTH METHODS=NULL
|
||||
* 250-AUTH METHODS=HASHEDPASSWORD
|
||||
*/
|
||||
BOOST_FOREACH(const std::string &s, reply.lines) {
|
||||
std::pair<std::string,std::string> l = SplitTorReplyLine(s);
|
||||
if (l.first == "AUTH") {
|
||||
std::map<std::string,std::string> m = ParseTorReplyMapping(l.second);
|
||||
std::map<std::string,std::string>::iterator i;
|
||||
if ((i = m.find("METHODS")) != m.end())
|
||||
boost::split(methods, i->second, boost::is_any_of(","));
|
||||
if ((i = m.find("COOKIEFILE")) != m.end())
|
||||
cookiefile = i->second;
|
||||
} else if (l.first == "VERSION") {
|
||||
std::map<std::string,std::string> m = ParseTorReplyMapping(l.second);
|
||||
std::map<std::string,std::string>::iterator i;
|
||||
if ((i = m.find("Tor")) != m.end()) {
|
||||
LogPrintf("[tor] Connected to Tor version %s\n", i->second);
|
||||
}
|
||||
}
|
||||
}
|
||||
BOOST_FOREACH(const std::string &s, methods) {
|
||||
LogPrintf("[tor] Supported authentication method: %s\n", s);
|
||||
}
|
||||
// Prefer NULL, otherwise COOKIE. If a password is provided, use HASHEDPASSWORD
|
||||
// We do not support SAFECOOKIE
|
||||
/* Authentication:
|
||||
* cookie: hex-encoded ~/.tor/control_auth_cookie
|
||||
* password: "password"
|
||||
*/
|
||||
if (methods.count("NULL")) {
|
||||
LogPrintf("[tor] Using NULL authentication\n");
|
||||
conn.Command("AUTHENTICATE", boost::bind(&TorController::auth_cb, this, _1, _2));
|
||||
} else if (methods.count("COOKIE")) {
|
||||
// Cookie: hexdump -e '32/1 "%02x""\n"' ~/.tor/control_auth_cookie
|
||||
LogPrintf("[tor] Using COOKIE authentication, reading cookie authentication from %s\n", cookiefile);
|
||||
std::string cookie = ReadBinaryFile(cookiefile).second;
|
||||
if (!cookie.empty()) {
|
||||
conn.Command("AUTHENTICATE " + HexStr(cookie), boost::bind(&TorController::auth_cb, this, _1, _2));
|
||||
} else {
|
||||
LogPrintf("[tor] Authentication cookie not found\n");
|
||||
}
|
||||
} else {
|
||||
/* TODO HASHEDPASSWORD w/ manual auth */
|
||||
LogPrintf("[tor] No supported authentication method\n");
|
||||
}
|
||||
} else {
|
||||
LogPrintf("[tor] Requesting protocol info failed\n");
|
||||
}
|
||||
}
|
||||
|
||||
void TorController::connected_cb(TorControlConnection& conn)
|
||||
{
|
||||
reconnect_timeout = RECONNECT_TIMEOUT_START;
|
||||
// First send a PROTOCOLINFO command to figure out what authentication is expected
|
||||
if (!conn.Command("PROTOCOLINFO 1", boost::bind(&TorController::protocolinfo_cb, this, _1, _2)))
|
||||
LogPrintf("[tor] Error sending initial protocolinfo command\n");
|
||||
}
|
||||
|
||||
void TorController::disconnected_cb(TorControlConnection& conn)
|
||||
{
|
||||
if (!reconnect)
|
||||
return;
|
||||
LogPrintf("[tor] Disconnected from Tor control port %s, trying to reconnect\n", target);
|
||||
// Single-shot timer for reconnect. Use exponential backoff.
|
||||
struct timeval time = MillisToTimeval(int64_t(reconnect_timeout * 1000.0));
|
||||
reconnect_ev = event_new(base, -1, 0, reconnect_cb, this);
|
||||
event_add(reconnect_ev, &time);
|
||||
reconnect_timeout *= RECONNECT_TIMEOUT_EXP;
|
||||
}
|
||||
|
||||
void TorController::Reconnect()
|
||||
{
|
||||
/* Try to reconnect and reestablish if we get booted - for example, Tor
|
||||
* may be restarting.
|
||||
*/
|
||||
if (!conn.Connect(target, boost::bind(&TorController::connected_cb, this, _1),
|
||||
boost::bind(&TorController::disconnected_cb, this, _1) )) {
|
||||
LogPrintf("[tor] Re-initiating connection to Tor control port %s failed\n", target);
|
||||
}
|
||||
}
|
||||
|
||||
std::string TorController::GetPrivateKeyFile()
|
||||
{
|
||||
return (GetDataDir() / "onion_private_key").string();
|
||||
}
|
||||
|
||||
void TorController::shutdown_poll_cb(evutil_socket_t fd, short what, void *arg)
|
||||
{
|
||||
TorController *self = (TorController*)arg;
|
||||
if (ShutdownRequested()) {
|
||||
// Shutdown was requested. Stop timers, and request control connection to terminate
|
||||
LogPrintf("[tor] Thread interrupt\n");
|
||||
if (self->shutdown_poll_ev)
|
||||
event_del(self->shutdown_poll_ev);
|
||||
self->shutdown_poll_ev = 0;
|
||||
if (self->reconnect_ev)
|
||||
event_del(self->reconnect_ev);
|
||||
self->reconnect_ev = 0;
|
||||
self->reconnect = false;
|
||||
self->conn.Disconnect();
|
||||
}
|
||||
}
|
||||
|
||||
void TorController::reconnect_cb(evutil_socket_t fd, short what, void *arg)
|
||||
{
|
||||
TorController *self = (TorController*)arg;
|
||||
self->Reconnect();
|
||||
}
|
||||
|
||||
/****** Thread ********/
|
||||
|
||||
static void TorControlThread()
|
||||
{
|
||||
struct event_base *base = event_base_new();
|
||||
if (!base) {
|
||||
LogPrintf("[tor] Unable to create event_base_new");
|
||||
return;
|
||||
}
|
||||
TorController ctrl(base, GetArg("-torcontrol", DEFAULT_TOR_CONTROL));
|
||||
|
||||
event_base_dispatch(base);
|
||||
event_base_free(base);
|
||||
}
|
||||
|
||||
void StartTorControl(boost::thread_group& threadGroup, CScheduler& scheduler)
|
||||
{
|
||||
threadGroup.create_thread(boost::bind(&TraceThread<void (*)()>, "torcontrol", &TorControlThread));
|
||||
}
|
||||
|
||||
void StopTorControl()
|
||||
{
|
||||
/* Nothing to do actually. Everything is cleaned up when thread exits */
|
||||
}
|
||||
|
||||
19
src/torcontrol.h
Normal file
19
src/torcontrol.h
Normal file
|
|
@ -0,0 +1,19 @@
|
|||
// Copyright (c) 2015 The Bitcoin Core developers
|
||||
// Distributed under the MIT software license, see the accompanying
|
||||
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
||||
|
||||
/**
|
||||
* Functionality for communicating with Tor.
|
||||
*/
|
||||
#ifndef BITCOIN_TORCONTROL_H
|
||||
#define BITCOIN_TORCONTROL_H
|
||||
|
||||
#include "scheduler.h"
|
||||
|
||||
extern const std::string DEFAULT_TOR_CONTROL;
|
||||
static const bool DEFAULT_LISTEN_ONION = true;
|
||||
|
||||
void StartTorControl(boost::thread_group& threadGroup, CScheduler& scheduler);
|
||||
void StopTorControl();
|
||||
|
||||
#endif /* BITCOIN_TORCONTROL_H */
|
||||
Loading…
Reference in a new issue