ipcpd: Add registration to DNS server

This adds support for adding the application name to a BIND DNS server
through the nsupdate utility.

1 files changed, 23 insertions, 13 deletions

diff --git a/src/ipcpd/shim-udp/CMakeLists.txt b/src/ipcpd/shim-udp/CMakeLists.txt
index f730fa3a..c71fa00b 100644
--- a/src/ipcpd/shim-udp/CMakeLists.txt
+++ b/src/ipcpd/shim-udp/CMakeLists.txt
@@ -14,30 +14,40 @@ include_directories(${CMAKE_BINARY_DIR}/include)
 include(CheckFunctionExists)
 CHECK_FUNCTION_EXISTS("gethostbyname" CMAKE_HAVE_GETHOSTBYNAME)
 IF(NOT CMAKE_HAVE_GETHOSTBYNAME)
-    CHECK_LIBRARY_EXISTS("nsl" "gethostbyname" "" CMAKE_LIB_NSL_HAS_GETHOSTBYNAME)
-    IF (CMAKE_LIB_NSL_HAS_GETHOSTBYNAME)
-        SET (X11_X_EXTRA_LIBS ${X11_X_EXTRA_LIBS} -lnsl)
-    ELSE (CMAKE_LIB_NSL_HAS_GETHOSTBYNAME)
-        CHECK_LIBRARY_EXISTS("bsd" "gethostbyname" "" CMAKE_LIB_BSD_HAS_GETHOSTBYNAME)
-        IF (CMAKE_LIB_BSD_HAS_GETHOSTBYNAME)
-             SET (X11_X_EXTRA_LIBS ${X11_X_EXTRA_LIBS} -lbsd)
-        ENDIF (CMAKE_LIB_BSD_HAS_GETHOSTBYNAME)
-    ENDIF (CMAKE_LIB_NSL_HAS_GETHOSTBYNAME)
+  CHECK_LIBRARY_EXISTS("nsl" "gethostbyname" "" CMAKE_LIB_NSL_HAS_GETHOSTBYNAME)
+  IF (CMAKE_LIB_NSL_HAS_GETHOSTBYNAME)
+    SET (X11_X_EXTRA_LIBS ${X11_X_EXTRA_LIBS} -lnsl)
+  ELSE (CMAKE_LIB_NSL_HAS_GETHOSTBYNAME)
+    CHECK_LIBRARY_EXISTS("bsd" "gethostbyname" "" CMAKE_LIB_BSD_HAS_GETHOSTBYNAME)
+    IF (CMAKE_LIB_BSD_HAS_GETHOSTBYNAME)
+      SET (X11_X_EXTRA_LIBS ${X11_X_EXTRA_LIBS} -lbsd)
+    ENDIF (CMAKE_LIB_BSD_HAS_GETHOSTBYNAME)
+  ENDIF (CMAKE_LIB_NSL_HAS_GETHOSTBYNAME)
 ENDIF(NOT CMAKE_HAVE_GETHOSTBYNAME)
 
+# Find the nsupdate executable
+find_program(NSUPDATE_EXECUTABLE
+  NAMES nsupdate
+  DOC "The nsupdate tool that enables DDNS")
+
+if (${NSUPDATE_EXECUTABLE} STREQUAL "NSUPDATE_EXECUTABLE-NOTFOUND")
+  message(FATAL_ERROR "Could not find nsupdate, which is needed for DDNS")
+else()
+  message("-- Found nsupdate: ${NSUPDATE_EXECUTABLE}")
+endif()
+
 SET(IPCP_SHIM_UDP_TARGET ipcpd-shim-udp CACHE STRING "IPCP_SHIM_UDP_TARGET")
 
 set(SHIM_UDP_SOURCES
-        # Add source files here
-        ${CMAKE_CURRENT_SOURCE_DIR}/main.c
-)
+  # Add source files here
+  ${CMAKE_CURRENT_SOURCE_DIR}/main.c)
 
 add_executable (ipcpd-shim-udp ${SHIM_UDP_SOURCES} ${IPCP_SOURCES})
 target_link_libraries (ipcpd-shim-udp LINK_PUBLIC ouroboros)
 
 include(MacroAddCompileFlags)
 if (CMAKE_BUILD_TYPE MATCHES Debug)
-   MACRO_ADD_COMPILE_FLAGS(ipcpd-shim-udp -DCONFIG_OUROBOROS_DEBUG)
+  MACRO_ADD_COMPILE_FLAGS(ipcpd-shim-udp -DCONFIG_OUROBOROS_DEBUG)
 endif (CMAKE_BUILD_TYPE MATCHES Debug)
 
 install(TARGETS ipcpd-shim-udp RUNTIME DESTINATION bin)