Fix a segmentation fault when connecting to a server without a port

fix #3260

CHANGELOG.rst

+Version 4.3 - 2017-05-02
+========================
+
+  - Fix a segmentation fault that occured when trying to connect to an IRC
+    server without any port configured.
+
 Version 4.2 - 2017-04-26
 ========================
 

CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.0)
 project(biboumi)
 
 set(${PROJECT_NAME}_VERSION_MAJOR 4)
-set(${PROJECT_NAME}_VERSION_MINOR 2)
+set(${PROJECT_NAME}_VERSION_MINOR 3)
 set(${PROJECT_NAME}_VERSION_SUFFIX "")
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++1y -pedantic -Wall -Wextra")

packaging/biboumi.spec.cmake

@@ -59,6 +59,10 @@ make check %{?_smp_mflags}
 
 
 %changelog
+* Wed May 2 2017 Le Coz Florent <louiz@louiz.org> - 4.3-1
+- Fix a segmentation fault that occured when trying to connect
+  to an IRC server without any port configured.
+
 * Wed Apr 26 2017 Le Coz Florent <louiz@louiz.org> - 4.2-1
 - Fix a build issue when LiteSQL is absent from the system
 

src/irc/irc_client.cpp

@@ -182,6 +182,11 @@ void IrcClient::start()
 {
   if (this->is_connecting() || this->is_connected())
     return;
+  if (this->ports_to_try.empty())
+    {
+      this->bridge.send_xmpp_message(this->hostname, "", "Can not connect to IRC server: no port specified.");
+      return;
+    }
   std::string port;
   bool tls;
   std::tie(port, tls) = this->ports_to_try.top();