Merge pull request #4142

cef4494 rpc: keep track of acceptors, and cancel them in StopRPCThreads (Wladimir J. van der Laan)
381b25d doc: remove mention of `-rpctimeout` from man page (Wladimir J. van der Laan)
1a44522 rpc: Make sure conn object is always cleaned up (Wladimir J. van der Laan)
0a0cd34 rpc: pass errors from async_accept (Wladimir J. van der Laan)

1 files changed, 23 insertions, 14 deletions

diff --git a/src/rpcserver.cpp b/src/rpcserver.cpp
index ac40ea7cf1..d4a229b092 100644
--- a/src/rpcserver.cpp
+++ b/src/rpcserver.cpp
@@ -39,6 +39,7 @@ static ssl::context* rpc_ssl_context = NULL;
 static boost::thread_group* rpc_worker_group = NULL;
 static boost::asio::io_service::work *rpc_dummy_work = NULL;
 static std::vector<CSubNet> rpc_allow_subnets; //!< List of subnets to allow RPC connections from
+static std::vector< boost::shared_ptr<ip::tcp::acceptor> > rpc_acceptors;
 
 void RPCTypeCheck(const Array& params,
                   const list<Value_type>& typesExpected,
@@ -444,7 +445,7 @@ template <typename Protocol, typename SocketAcceptorService>
 static void RPCAcceptHandler(boost::shared_ptr< basic_socket_acceptor<Protocol, SocketAcceptorService> > acceptor,
                              ssl::context& context,
                              bool fUseSSL,
-                             AcceptedConnection* conn,
+                             boost::shared_ptr< AcceptedConnection > conn,
                              const boost::system::error_code& error);
 
 /**
@@ -456,7 +457,7 @@ static void RPCListen(boost::shared_ptr< basic_socket_acceptor<Protocol, SocketA
                    const bool fUseSSL)
 {
     // Accept connection
-    AcceptedConnectionImpl<Protocol>* conn = new AcceptedConnectionImpl<Protocol>(acceptor->get_io_service(), context, fUseSSL);
+    boost::shared_ptr< AcceptedConnectionImpl<Protocol> > conn(new AcceptedConnectionImpl<Protocol>(acceptor->get_io_service(), context, fUseSSL));
 
     acceptor->async_accept(
             conn->sslStream.lowest_layer(),
@@ -466,7 +467,7 @@ static void RPCListen(boost::shared_ptr< basic_socket_acceptor<Protocol, SocketA
                 boost::ref(context),
                 fUseSSL,
                 conn,
-                boost::asio::placeholders::error));
+                _1));
 }
 
 
@@ -477,21 +478,20 @@ template <typename Protocol, typename SocketAcceptorService>
 static void RPCAcceptHandler(boost::shared_ptr< basic_socket_acceptor<Protocol, SocketAcceptorService> > acceptor,
                              ssl::context& context,
                              const bool fUseSSL,
-                             AcceptedConnection* conn,
+                             boost::shared_ptr< AcceptedConnection > conn,
                              const boost::system::error_code& error)
 {
     // Immediately start accepting new connections, except when we're cancelled or our socket is closed.
     if (error != asio::error::operation_aborted && acceptor->is_open())
         RPCListen(acceptor, context, fUseSSL);
 
-    AcceptedConnectionImpl<ip::tcp>* tcp_conn = dynamic_cast< AcceptedConnectionImpl<ip::tcp>* >(conn);
+    AcceptedConnectionImpl<ip::tcp>* tcp_conn = dynamic_cast< AcceptedConnectionImpl<ip::tcp>* >(conn.get());
 
-    // TODO: Actually handle errors
     if (error)
     {
-        delete conn;
+        // TODO: Actually handle errors
+        LogPrintf("%s: Error: %s\n", __func__, error.message());
     }
-
     // Restrict callers by IP.  It is important to
     // do this before starting client thread, to filter out
     // certain DoS and misbehaving clients.
@@ -500,12 +500,11 @@ static void RPCAcceptHandler(boost::shared_ptr< basic_socket_acceptor<Protocol,
         // Only send a 403 if we're not using SSL to prevent a DoS during the SSL handshake.
         if (!fUseSSL)
             conn->stream() << HTTPReply(HTTP_FORBIDDEN, "", false) << std::flush;
-        delete conn;
+        conn->close();
     }
     else {
-        ServiceConnection(conn);
+        ServiceConnection(conn.get());
         conn->close();
-        delete conn;
     }
 }
 
@@ -595,12 +594,13 @@ void StartRPCThreads()
     asio::ip::address bindAddress = loopback ? asio::ip::address_v6::loopback() : asio::ip::address_v6::any();
     ip::tcp::endpoint endpoint(bindAddress, GetArg("-rpcport", Params().RPCPort()));
     boost::system::error_code v6_only_error;
-    boost::shared_ptr<ip::tcp::acceptor> acceptor(new ip::tcp::acceptor(*rpc_io_service));
 
     bool fListening = false;
     std::string strerr;
     try
     {
+        boost::shared_ptr<ip::tcp::acceptor> acceptor(new ip::tcp::acceptor(*rpc_io_service));
+        rpc_acceptors.push_back(acceptor);
         acceptor->open(endpoint.protocol());
         acceptor->set_option(boost::asio::ip::tcp::acceptor::reuse_address(true));
 
@@ -618,7 +618,6 @@ void StartRPCThreads()
     {
         strerr = strprintf(_("An error occurred while setting up the RPC port %u for listening on IPv6, falling back to IPv4: %s"), endpoint.port(), e.what());
     }
-
     try {
         // If dual IPv6/IPv4 failed (or we're opening loopback interfaces only), open IPv4 separately
         if (!fListening || loopback || v6_only_error)
@@ -626,7 +625,8 @@ void StartRPCThreads()
             bindAddress = loopback ? asio::ip::address_v4::loopback() : asio::ip::address_v4::any();
             endpoint.address(bindAddress);
 
-            acceptor.reset(new ip::tcp::acceptor(*rpc_io_service));
+            boost::shared_ptr<ip::tcp::acceptor> acceptor(new ip::tcp::acceptor(*rpc_io_service));
+            rpc_acceptors.push_back(acceptor);
             acceptor->open(endpoint.protocol());
             acceptor->set_option(boost::asio::ip::tcp::acceptor::reuse_address(true));
             acceptor->bind(endpoint);
@@ -670,7 +670,16 @@ void StopRPCThreads()
 {
     if (rpc_io_service == NULL) return;
 
+    // First, cancel all timers and acceptors
+    // This is not done automatically by ->stop(), and in some cases the destructor of
+    // asio::io_service can hang if this is skipped.
+    BOOST_FOREACH(const boost::shared_ptr<ip::tcp::acceptor> &acceptor, rpc_acceptors)
+        acceptor->cancel();
+    rpc_acceptors.clear();
+    BOOST_FOREACH(const PAIRTYPE(std::string, boost::shared_ptr<deadline_timer>) &timer, deadlineTimers)
+        timer.second->cancel();
     deadlineTimers.clear();
+
     rpc_io_service->stop();
     if (rpc_worker_group != NULL)
         rpc_worker_group->join_all();