Add IPC:

  Manaplus now accepts connections on the 44007 port.

  * Uses SDL_Net/SDL_Thread.
  * Port can be changed with envvar IPC_PORT.
  * Default port is first checked then incremented until one is available.
  * start on demand with /ipctoggle (shuts down server socket)

  It has a simple text protocol: TYPE arg1 [args]...
  Message types:
   * CMD: execs a command supported by manaplus, e.g /emote
   * LTALK: talks in general tab
   * TALK: talks in current focused tab
   * [TODO] KEY: do as if the KEY was pressed on keyboard

2 files changed, 264 insertions, 0 deletions

diff --git a/src/net/ipc.cpp b/src/net/ipc.cpp
new file mode 100644
index 000000000..9625e119a
--- /dev/null
+++ b/src/net/ipc.cpp
@@ -0,0 +1,208 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2014  Vincent Petithory <vincent.petithory@gmail.com>
+ *
+ *  This file is part of The ManaPlus Client.
+ *
+ *  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 2 of the License, or
+ *  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/>.
+ */
+
+#include "net/ipc.h"
+
+#include "gui/widgets/tabs/chattab.h"
+#include "gui/windows/chatwindow.h"
+#include "utils/sdlhelper.h"
+#include "utils/stringutils.h"
+#include <iostream>
+
+#include "commandhandler.h"
+#include "logger.h"
+
+IPC *ipc = nullptr;
+
+const std::string IPC_TYPE_CMD = "CMD";
+const std::string IPC_TYPE_TALK = "TALK";
+const std::string IPC_TYPE_LTALK = "LTALK";
+
+IPC::IPC(unsigned short port) :
+    mListen(false),
+    mNumReqs(0),
+    mPort(port),
+    mSocket(nullptr),
+    mThread(nullptr)
+{
+}
+
+IPC::~IPC()
+{
+}
+
+bool IPC::init()
+{
+    IPaddress ip;
+
+    if(SDLNet_ResolveHost(&ip,NULL,mPort) == -1)
+    {
+        logger->log("IPC: SDLNet_ResolveHost: %s\n", SDLNet_GetError());
+        return false;
+    }
+
+    mSocket = SDLNet_TCP_Open(&ip);
+    if (!mSocket)
+    {
+        logger->log("IPC: Error in TcpNet::open(): %s", TcpNet::getError());
+        return false;
+    }
+
+    mThread = SDL::createThread(&IPC::acceptLoop, "ipc", this);
+    if (!mThread)
+    {
+        logger->log("IPC: unable to create acceptLoop thread");
+        return false;
+    }
+    return true;
+}
+
+int IPC::acceptLoop(void *ptr)
+{
+    IPC *const ipc = reinterpret_cast<IPC*>(ptr);
+    const int max_length = 1024;
+    SDLNet_SocketSet set;
+
+    set = SDLNet_AllocSocketSet(1);
+    SDLNet_TCP_AddSocket(set, ipc->mSocket);
+    ipc->mListen = true;
+    try
+    {
+        while (ipc->mListen)
+        {
+            SDLNet_CheckSockets(set, 250);
+            if (!SDLNet_SocketReady(ipc->mSocket))
+                continue;
+
+            TCPsocket sock;
+            sock = SDLNet_TCP_Accept(ipc->mSocket);
+            if (!sock)
+            {
+                logger->log("IPC: unable to accept connection");
+                continue;
+            }
+            char data[max_length] = {0};
+            int result;
+            result = SDLNet_TCP_Recv(sock, data, max_length);
+            if (result <= 0)
+            {
+                logger->log("IPC: unable to accept connection");
+                SDLNet_TCP_Close(sock);
+                continue;
+            }
+
+            // Parse input: TYPE args
+            const std::string req(data);
+            const size_t pos = req.find(' ');
+            const std::string type(req, 0, pos);
+            std::string args(req, pos == std::string::npos
+                     ? req.size() : pos + 1);
+            args = trim(args);
+      
+            std::string resp;
+            if (type == IPC_TYPE_CMD)
+            {
+                commandHandler->handleCommand(args, debugChatTab);
+                ipc->mNumReqs++;
+                resp = strprintf("[%s](%d) OK\n", IPC_TYPE_CMD.c_str(), ipc->mNumReqs);
+            }
+            else if (type == IPC_TYPE_LTALK)
+            {
+                chatWindow->localChatInput(args);
+                ipc->mNumReqs++;
+                resp = strprintf("[%s](%d) OK\n", IPC_TYPE_LTALK.c_str(), ipc->mNumReqs);
+            }
+            else if (type == IPC_TYPE_TALK)
+            {
+                chatWindow->chatInput(args);
+                ipc->mNumReqs++;
+                resp = strprintf("[%s](%d) OK\n", IPC_TYPE_TALK.c_str(), ipc->mNumReqs);
+            }
+            else
+            {
+                resp = type + ": no handler for this IPC type\n";
+            }
+      
+            int len;
+            const char *respc;
+            respc = resp.c_str();
+            len = strlen(respc)+1;
+            result = SDLNet_TCP_Send(sock, respc, len);
+            if (result < len)
+            {
+                logger->log("IPC: SDLNet_TCP_Send: %s\n", SDLNet_GetError());
+                SDLNet_TCP_Close(sock);
+                continue;
+            }
+            SDLNet_TCP_Close(sock);
+        }
+    }
+    catch (std::exception& e)
+    {
+        std::cerr << e.what() << std::endl;
+        SDLNet_TCP_Close(ipc->mSocket);
+        return 1;
+    }
+    SDLNet_TCP_Close(ipc->mSocket);
+    return 0;
+}
+
+unsigned short IPC::port()
+{
+    return mPort;
+}
+
+void IPC::stop()
+{
+    if (!ipc)
+        return;
+
+    logger->log("Stopping IPC...");
+    ipc->mListen = false;
+    int loopRet;
+    SDL_WaitThread(ipc->mThread, &loopRet);
+    ipc = nullptr;
+}
+
+void IPC::start()
+{
+    if (ipc)
+        return;
+
+    unsigned short ipc_port(44007);
+    if (getenv("IPC_PORT"))
+        ipc_port = atoi(getenv("IPC_PORT"));
+
+    logger->log("Starting IPC...");
+    while (true)
+    {
+        logger->log(strprintf("  -> trying port %d...", ipc_port));
+        ipc = new IPC(ipc_port);
+        if (ipc->init())
+        {
+            logger->log(strprintf("  -> Port %d selected", ipc_port));
+            break;
+        }
+        else
+        {
+            ipc_port++;
+        }
+    }
+}
diff --git a/src/net/ipc.h b/src/net/ipc.h
new file mode 100644
index 000000000..28c536efb
--- /dev/null
+++ b/src/net/ipc.h
@@ -0,0 +1,56 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2014  Vincent Petithory <vincent.petithory@gmail.com>
+ *
+ *  This file is part of The ManaPlus Client.
+ *
+ *  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 2 of the License, or
+ *  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/>.
+ */
+
+#ifndef IPC_H
+#define IPC_H
+
+#include "net/sdltcpnet.h"
+#include <SDL_thread.h>
+
+class IPC
+{
+public:
+    /**
+     * Constructor.
+     */
+    IPC(unsigned short port);
+  
+    /**
+     * Destructor.
+     */
+    ~IPC();
+  
+    bool init();
+    unsigned short port();
+    static int acceptLoop(void *ptr);
+    static void start();
+    static void stop();
+  
+private:
+    bool mListen;
+    unsigned int mNumReqs;
+    unsigned short mPort;
+    TcpNet::Socket mSocket;
+    SDL_Thread *mThread;
+};
+
+extern IPC *ipc;
+
+#endif  // IPC_H