[#2027] Fix segmentation fault when showMessage callback is called after

an error occured with libzrtpcpp. Also, exceptions in AudioRtpFactory are
now derived from some more specialized types.

sflphone-client-gnome/src/config/accountwindow.c

@@ -754,6 +754,7 @@ show_account_window (account_t * a)
 			gchar* keyExchange = (gchar *)gtk_combo_box_get_active_text(GTK_COMBO_BOX(keyExchangeCombo));
             if (g_strcasecmp(keyExchange, "ZRTP") == 0) {
                 g_hash_table_replace(currentAccount->properties, g_strdup(ACCOUNT_SRTP_ENABLED), g_strdup("TRUE"));
+                g_hash_table_replace(currentAccount->properties, g_strdup(ACCOUNT_KEY_EXCHANGE), g_strdup("1"));
             } else {
                 g_hash_table_replace(currentAccount->properties, g_strdup(ACCOUNT_SRTP_ENABLED), g_strdup("FALSE"));
             }

sflphone-common/src/audio/audiortp/AudioRtpFactory.cpp

@@ -58,8 +58,8 @@ namespace sfl {
         assert(ca);
        
         if (_rtpSession != NULL) {
-            _debugException("An audio rtp thread was already created but not \
-                             destroyed. Forcing it before continuing.\n");
+            _debugException("An audio rtp thread was already created but not" \
+                            "destroyed. Forcing it before continuing.\n");
             stop();
         }
         
@@ -113,27 +113,23 @@ namespace sfl {
     void AudioRtpFactory::start(void)
     {
         if (_rtpSession == NULL) {
-            throw AudioRtpFactoryException();
+            throw AudioRtpFactoryException("_rtpSession was null when trying to start audio thread");
         }
          
-        try {
         switch(_rtpSessionType) {
             case Sdes:
             case Symmetric:
                 _debug("Starting symmetric rtp thread\n");
                 if(static_cast<AudioSymmetricRtpSession *>(_rtpSession)->startRtpThread() != 0) {
-                        throw AudioRtpFactoryException();
+                    throw AudioRtpFactoryException("Failed to start AudioSymmetricRtpSession thread");
                 }
                 break;
             case Zrtp:
                 if(static_cast<AudioZrtpSession *>(_rtpSession)->startRtpThread() != 0) {
-                        throw AudioRtpFactoryException();
+                    throw AudioRtpFactoryException("Failed to start AudioZrtpSession thread");
                 }
                 break;       
             }
-        } catch (...) {
-            throw AudioRtpFactoryException();
-        }
     }
 
     void AudioRtpFactory::stop(void) 
@@ -141,8 +137,7 @@ namespace sfl {
         ost::MutexLock mutex(_audioRtpThreadMutex);
         _debug("Stopping audio rtp session\n");
         if (_rtpSession == NULL) {
-            _debugException("_rtpSession is null\n");
-            throw AudioRtpFactoryException();
+            throw AudioRtpFactoryException("_rtpSession is null when trying to stop");
         }
         try {
             switch(_rtpSessionType) {

sflphone-common/src/audio/audiortp/AudioRtpFactory.h

@@ -19,7 +19,7 @@
 #ifndef __SFL_AUDIO_RTP_FACTORY_H__
 #define __SFL_AUDIO_RTP_FACTORY_H__
 
-#include <exception>
+#include <stdexcept>
 #include <cc++/thread.h>
 
 class SIPCall;
@@ -38,20 +38,15 @@ namespace sfl {
         Sdes
     } RtpMethod;
 
-    class UnsupportedRtpSessionType: public std::exception
-    {
-      virtual const char* what() const throw()
-      {
-        return "Could not create RTP session of the given type";
-      }
+
+    class UnsupportedRtpSessionType : public std::logic_error {
+        public:
+        UnsupportedRtpSessionType(const std::string& msg = "") : std::logic_error(msg) {}
     };
     
-    class AudioRtpFactoryException: public std::exception
-    {
-      virtual const char* what() const throw()
-      {
-        return "An AudioRtpFactoryException occured";
-      }
+    class AudioRtpFactoryException : public std::logic_error {
+        public:
+        AudioRtpFactoryException(const std::string& msg = "") : std::logic_error(msg) {}
     };
 
     class AudioRtpFactory {

sflphone-common/src/audio/audiortp/ZrtpSessionCallback.cpp

@@ -143,29 +143,30 @@ namespace sfl {
         if (sev == Info) {
             msg = _infoMap[subCode];
             if (msg != NULL) {
-                _debug("ZRTP Debug: %s\n", msg->c_str());
+                _debug("ZRTP Debug:\n", msg->c_str());
             }
         }
         if (sev == Warning) {
             msg = _warningMap[subCode];
             if (msg != NULL) {
-                _debug("ZRTP Debug: %s\n", msg->c_str());
+                _debug("ZRTP Debug:\n", msg->c_str());
             }
         }
         if (sev == Severe) {
             msg = _severeMap[subCode];
             if (msg != NULL) {
-                _debug("ZRTP Debug: %s\n", msg->c_str());
+                _debug("ZRTP Debug:\n", msg->c_str());
             }
         }
         if (sev == ZrtpError) {
             if (subCode < 0) {  // received an error packet from peer
                 subCode *= -1;
-                _debug("Received an error packet from peer: %s\n", msg->c_str());
+                _debug("Received an error packet from peer:\n");
             }
             else {
-                _debug("Sent error packet to peer: %s\n", msg->c_str());
+                _debug("Sent error packet to peer:\n");
             }
+            
             msg = _zrtpMap[subCode];
             if (msg != NULL) {
                 _debug("ZRTP Debug: %s\n", msg->c_str());
@@ -180,10 +181,10 @@ namespace sfl {
         if (severity == ZrtpError) {
             if (subCode < 0) {  // received an error packet from peer
                 subCode *= -1;
-                _debug("Received error packet: ");
+                _debug("Received error packet: \n");
             }
             else {
-                _debug("Sent error packet: ");
+                _debug("Sent error packet: \n");
             }
             msg = _zrtpMap[subCode];
             if (msg != NULL) {