IPC-server hardening and update

- add IMPLEMENT_RANDOMIZE_STACK for ipcThread()
- log / print boost interprocess exceptions
- use MAX_URI_LENGTH in guiconstants.h (also used in qrcodedialog.cpp)
- remove unneeded includes and ipcShutdown() from qtipcserver.cpp
- fix a small mem-leak by deleting mq before re-using it
- make ipcThread() and ipcThread2() static functions
- add some more comments

4 files changed, 74 insertions, 38 deletions

diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 55b5f74c3b..f9f5115cd0 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -126,13 +126,21 @@ int main(int argc, char *argv[])
             const char *strURI = argv[i];
             try {
                 boost::interprocess::message_queue mq(boost::interprocess::open_only, BITCOINURI_QUEUE_NAME);
-                if(mq.try_send(strURI, strlen(strURI), 0))
+                if (mq.try_send(strURI, strlen(strURI), 0))
+                    // if URI could be sent to the message queue exit here
                     exit(0);
                 else
+                    // if URI could not be sent to the message queue do a normal Bitcoin-Qt startup
                     break;
             }
             catch (boost::interprocess::interprocess_exception &ex) {
-                break;
+                // don't log the "file not found" exception, because that's normal for
+                // the first start of the first instance
+                if (ex.get_error_code() != boost::interprocess::not_found_error)
+                {
+                    printf("main() - boost interprocess exception #%d: %s\n", ex.get_error_code(), ex.what());
+                    break;
+                }
             }
         }
     }
@@ -278,6 +286,8 @@ int main(int argc, char *argv[])
                             mq.try_send(strURI, strlen(strURI), 0);
                         }
                         catch (boost::interprocess::interprocess_exception &ex) {
+                            printf("main() - boost interprocess exception #%d: %s\n", ex.get_error_code(), ex.what());
+                            break;
                         }
                     }
                 }
diff --git a/src/qt/guiconstants.h b/src/qt/guiconstants.h
index 6f6fa7f261..405ba396b7 100644
--- a/src/qt/guiconstants.h
+++ b/src/qt/guiconstants.h
@@ -4,10 +4,10 @@
 /* Milliseconds between model updates */
 static const int MODEL_UPDATE_DELAY = 500;
 
-/* Maximum  passphrase length */
+/* AskPassphraseDialog -- Maximum passphrase length */
 static const int MAX_PASSPHRASE_SIZE = 1024;
 
-/* Size of icons in status bar */
+/* BitcoinGUI -- Size of icons in status bar */
 static const int STATUSBAR_ICONSIZE = 16;
 
 /* Invalid field background style */
diff --git a/src/qt/qtipcserver.cpp b/src/qt/qtipcserver.cpp
index f9ee9ad5ca..e413c71bc0 100644
--- a/src/qt/qtipcserver.cpp
+++ b/src/qt/qtipcserver.cpp
@@ -2,80 +2,96 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
 
-#include <boost/algorithm/string.hpp>
-#include <boost/interprocess/ipc/message_queue.hpp>
-#include <boost/tokenizer.hpp>
+#include "qtipcserver.h"
+#include "guiconstants.h"
+#include "ui_interface.h"
+#include "util.h"
+
 #include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/interprocess/ipc/message_queue.hpp>
 #include <boost/version.hpp>
 
 #if defined(WIN32) && (!defined(BOOST_INTERPROCESS_HAS_WINDOWS_KERNEL_BOOTTIME) || !defined(BOOST_INTERPROCESS_HAS_KERNEL_BOOTTIME) || BOOST_VERSION < 104900)
 #warning Compiling without BOOST_INTERPROCESS_HAS_WINDOWS_KERNEL_BOOTTIME and BOOST_INTERPROCESS_HAS_KERNEL_BOOTTIME uncommented in boost/interprocess/detail/tmp_dir_helpers.hpp or using a boost version before 1.49 may have unintended results see svn.boost.org/trac/boost/ticket/5392
 #endif
 
-#include "ui_interface.h"
-#include "qtipcserver.h"
-#include "util.h"
-
+using namespace boost;
 using namespace boost::interprocess;
 using namespace boost::posix_time;
-using namespace boost;
-using namespace std;
+
+static void ipcThread2(void* pArg);
 
 #ifdef MAC_OSX
 // URI handling not implemented on OSX yet
 
 void ipcInit() { }
-void ipcShutdown() { }
 
 #else
 
-void ipcShutdown()
+static void ipcThread(void* pArg)
 {
-    message_queue::remove(BITCOINURI_QUEUE_NAME);
+    IMPLEMENT_RANDOMIZE_STACK(ipcThread(pArg));
+	
+    // Make this thread recognisable as the GUI-IPC thread
+    RenameThread("bitcoin-gui-ipc");
+	
+    try
+    {
+        ipcThread2(pArg);
+    }
+    catch (std::exception& e) {
+        PrintExceptionContinue(&e, "ipcThread()");
+    } catch (...) {
+        PrintExceptionContinue(NULL, "ipcThread()");
+    }
+    printf("ipcThread exited\n");
 }
 
-void ipcThread(void* parg)
+static void ipcThread2(void* pArg)
 {
-    // Make this thread recognisable as the GUI-IPC thread
-    RenameThread("bitcoin-gui-ipc");
+    printf("ipcThread started\n");
+
+    message_queue* mq = (message_queue*)pArg;
+    char buffer[MAX_URI_LENGTH + 1] = "";
+    size_t nSize = 0;
+    unsigned int nPriority = 0;
 
-    message_queue* mq = (message_queue*)parg;
-    char strBuf[257];
-    size_t nSize;
-    unsigned int nPriority;
     loop
     {
         ptime d = boost::posix_time::microsec_clock::universal_time() + millisec(100);
-        if(mq->timed_receive(&strBuf, sizeof(strBuf), nSize, nPriority, d))
+        if (mq->timed_receive(&buffer, sizeof(buffer), nSize, nPriority, d))
         {
-            uiInterface.ThreadSafeHandleURI(std::string(strBuf, nSize));
+            uiInterface.ThreadSafeHandleURI(std::string(buffer, nSize));
             Sleep(1000);
         }
+
         if (fShutdown)
-        {
-            ipcShutdown();
             break;
-        }
     }
-    ipcShutdown();
+
+    // Remove message queue
+    message_queue::remove(BITCOINURI_QUEUE_NAME);
+    // Cleanup allocated memory
+    delete mq;
 }
 
 void ipcInit()
 {
-    message_queue* mq;
-    char strBuf[257];
-    size_t nSize;
-    unsigned int nPriority;
+    message_queue* mq = NULL;
+    char buffer[MAX_URI_LENGTH + 1] = "";
+    size_t nSize = 0;
+    unsigned int nPriority = 0;
+
     try {
-        mq = new message_queue(open_or_create, BITCOINURI_QUEUE_NAME, 2, 256);
+        mq = new message_queue(open_or_create, BITCOINURI_QUEUE_NAME, 2, MAX_URI_LENGTH);
 
         // Make sure we don't lose any bitcoin: URIs
         for (int i = 0; i < 2; i++)
         {
             ptime d = boost::posix_time::microsec_clock::universal_time() + millisec(1);
-            if(mq->timed_receive(&strBuf, sizeof(strBuf), nSize, nPriority, d))
+            if (mq->timed_receive(&buffer, sizeof(buffer), nSize, nPriority, d))
             {
-                uiInterface.ThreadSafeHandleURI(std::string(strBuf, nSize));
+                uiInterface.ThreadSafeHandleURI(std::string(buffer, nSize));
             }
             else
                 break;
@@ -83,14 +99,19 @@ void ipcInit()
 
         // Make sure only one bitcoin instance is listening
         message_queue::remove(BITCOINURI_QUEUE_NAME);
-        mq = new message_queue(open_or_create, BITCOINURI_QUEUE_NAME, 2, 256);
+        delete mq;
+
+        mq = new message_queue(open_or_create, BITCOINURI_QUEUE_NAME, 2, MAX_URI_LENGTH);
     }
     catch (interprocess_exception &ex) {
+        printf("ipcInit() - boost interprocess exception #%d: %s\n", ex.get_error_code(), ex.what());
         return;
     }
+
     if (!CreateThread(ipcThread, mq))
     {
         delete mq;
+        return;
     }
 }
 
diff --git a/src/qt/qtipcserver.h b/src/qt/qtipcserver.h
index fcff10d8da..484b6222eb 100644
--- a/src/qt/qtipcserver.h
+++ b/src/qt/qtipcserver.h
@@ -1,4 +1,9 @@
+#ifndef QTIPCSERVER_H
+#define QTIPCSERVER_H
+
+// Define Bitcoin-Qt message queue name
 #define BITCOINURI_QUEUE_NAME "BitcoinURI"
 
 void ipcInit();
-void ipcShutdown();
+
+#endif // QTIPCSERVER_H