Add support for systemd-daemon

CMakeLists.txt

@@ -19,6 +19,7 @@ find_package(Iconv REQUIRED)
 include(FindEXPAT)
 find_package(EXPAT REQUIRED)
 find_package(Libidn)
+find_package(SystemdDaemon)
 
 # To be able to include the config.h file generated by cmake
 include_directories("src/")
@@ -31,6 +32,12 @@ else()
   message("Building without stringprep support.")
 endif()
 
+if(SYSTEMDDAEMON_FOUND)
+  include_directories(${SYSTEMDDAEMON_INCLUDE_DIRS})
+else()
+  message("Building without systemd daemon support.")
+endif()
+
 set(POLLER "POLL" CACHE STRING
   "Choose the poller between POLL and EPOLL (Linux-only)")
 if((NOT ${POLLER} MATCHES "POLL") AND
@@ -124,6 +131,9 @@ target_link_libraries(${PROJECT_NAME}
   bridge
   utils
   config)
+if(SYSTEMDDAEMON_FOUND)
+  target_link_libraries(xmpp ${SYSTEMDDAEMON_LIBRARIES})
+endif()
 if(WITH_DOC)
   add_dependencies(${PROJECT_NAME} doc)
 endif()

cmake/Modules/FindSystemdDaemon.cmake

@@ -0,0 +1,34 @@
+# - Find SystemdDaemon
+# Find the systemd daemon library
+#
+# This module defines the following variables:
+#   SYSTEMDDAEMON_FOUND  -  True if library and include directory are found
+# If set to TRUE, the following are also defined:
+#   SYSTEMDDAEMON_INCLUDE_DIRS  -  The directory where to find the header file
+#   SYSTEMDDAEMON_LIBRARIES  -  Where to find the library file
+#
+# For conveniance, these variables are also set. They have the same values
+# than the variables above.  The user can thus choose his/her prefered way
+# to write them.
+#   SYSTEMDDAEMON_LIBRARY
+#   SYSTEMDDAEMON_INCLUDE_DIR
+#
+# This file is in the public domain
+
+find_path(SYSTEMDDAEMON_INCLUDE_DIRS NAMES systemd/sd-daemon.h
+  DOC "The Systemd Daemon include directory")
+
+find_library(SYSTEMDDAEMON_LIBRARIES NAMES systemd-daemon
+  DOC "The Systemd Daemon library")
+
+# Use some standard module to handle the QUIETLY and REQUIRED arguments, and
+# set SYSTEMDDAEMON_FOUND to TRUE if these two variables are set.
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(SystemdDaemon REQUIRED_VARS SYSTEMDDAEMON_LIBRARIES SYSTEMDDAEMON_INCLUDE_DIRS)
+
+if(SYSTEMDDAEMON_FOUND)
+  set(SYSTEMDDAEMON_LIBRARY ${SYSTEMDDAEMON_LIBRARIES})
+  set(SYSTEMDDAEMON_INCLUDE_DIR ${SYSTEMDDAEMON_INCLUDE_DIRS})
+endif()
+
+mark_as_advanced(SYSTEMDDAEMON_INCLUDE_DIRS SYSTEMDDAEMON_LIBRARIES)

src/config.h.cmake

@@ -1,3 +1,4 @@
 #cmakedefine ICONV_SECOND_ARGUMENT_IS_CONST
 #cmakedefine LIBIDN_FOUND
+#cmakedefine SYSTEMDDAEMON_FOUND
 #cmakedefine POLLER ${POLLER}

src/xmpp/xmpp_component.cpp

@@ -12,6 +12,12 @@
 
 #include <stdio.h>
 
+#include <config.h>
+
+#ifdef SYSTEMDDAEMON_FOUND
+# include <systemd/sd-daemon.h>
+#endif
+
 #define STREAM_NS        "http://etherx.jabber.org/streams"
 #define COMPONENT_NS     "jabber:component:accept"
 #define MUC_NS           "http://jabber.org/protocol/muc"
@@ -74,6 +80,9 @@ void XmppComponent::send_stanza(const Stanza& stanza)
 void XmppComponent::on_connection_failed(const std::string& reason)
 {
   log_error("Failed to connect to the XMPP server: " << reason);
+#ifdef SYSTEMDDAEMON_FOUND
+  sd_notifyf(0, "STATUS=Failed to connect to the XMPP server: %s", reason.data());
+#endif
 }
 
 void XmppComponent::on_connected()
@@ -248,6 +257,9 @@ void XmppComponent::handle_handshake(const Stanza& stanza)
   this->ever_auth = true;
   this->last_auth = true;
   log_info("Authenticated with the XMPP server");
+#ifdef SYSTEMDDAEMON_FOUND
+  sd_notify(0, "READY=1");
+#endif
 }
 
 void XmppComponent::handle_presence(const Stanza& stanza)
@@ -420,6 +432,11 @@ void XmppComponent::handle_error(const Stanza& stanza)
   if (text)
     error_message = text->get_inner();
   log_error("Stream error received from the XMPP server: " << error_message);
+#ifdef SYSTEMDDAEMON_FOUND
+  if (!this->ever_auth)
+    sd_notifyf(0, "STATUS=Failed to authenticate to the XMPP server: %s", error_message.data());
+#endif
+
 }
 
 Bridge* XmppComponent::get_user_bridge(const std::string& user_jid)