Imported Upstream version 5.3.0

6 files changed, 1373 insertions, 0 deletions

diff --git a/src/libcharon/plugins/resolve/Makefile.am b/src/libcharon/plugins/resolve/Makefile.am
new file mode 100644
index 000000000..9cfc370c0
--- /dev/null
+++ b/src/libcharon/plugins/resolve/Makefile.am
@@ -0,0 +1,20 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/libstrongswan \
+	-I$(top_srcdir)/src/libhydra \
+	-I$(top_srcdir)/src/libcharon \
+	-DRESOLV_CONF=\"${resolv_conf}\"
+
+AM_CFLAGS = \
+	$(PLUGIN_CFLAGS)
+
+if MONOLITHIC
+noinst_LTLIBRARIES = libstrongswan-resolve.la
+else
+plugin_LTLIBRARIES = libstrongswan-resolve.la
+endif
+
+libstrongswan_resolve_la_SOURCES = \
+	resolve_plugin.h resolve_plugin.c \
+	resolve_handler.h resolve_handler.c
+
+libstrongswan_resolve_la_LDFLAGS = -module -avoid-version
diff --git a/src/libcharon/plugins/resolve/Makefile.in b/src/libcharon/plugins/resolve/Makefile.in
new file mode 100644
index 000000000..91479bf52
--- /dev/null
+++ b/src/libcharon/plugins/resolve/Makefile.in
@@ -0,0 +1,781 @@
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+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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+
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+	resolve_handler.lo
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+    n|no|NO) false;; \
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+	-I$(top_srcdir)/src/libstrongswan \
+	-I$(top_srcdir)/src/libhydra \
+	-I$(top_srcdir)/src/libcharon \
+	-DRESOLV_CONF=\"${resolv_conf}\"
+
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+	$(PLUGIN_CFLAGS)
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+	resolve_plugin.h resolve_plugin.c \
+	resolve_handler.h resolve_handler.c
+
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+all: all-am
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+	  $(AUTOMAKE) --gnu src/libcharon/plugins/resolve/Makefile
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+	@list='$(plugin_LTLIBRARIES)'; test -n "$(plugindir)" || list=; \
+	list2=; for p in $$list; do \
+	  if test -f $$p; then \
+	    list2="$$list2 $$p"; \
+	  else :; fi; \
+	done; \
+	test -z "$$list2" || { \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(plugindir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(plugindir)" || exit 1; \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 '$(DESTDIR)$(plugindir)'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 "$(DESTDIR)$(plugindir)"; \
+	}
+
+uninstall-pluginLTLIBRARIES:
+	@$(NORMAL_UNINSTALL)
+	@list='$(plugin_LTLIBRARIES)'; test -n "$(plugindir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(plugindir)/$$f'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f "$(DESTDIR)$(plugindir)/$$f"; \
+	done
+
+clean-pluginLTLIBRARIES:
+	-test -z "$(plugin_LTLIBRARIES)" || rm -f $(plugin_LTLIBRARIES)
+	@list='$(plugin_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libstrongswan-resolve.la: $(libstrongswan_resolve_la_OBJECTS) $(libstrongswan_resolve_la_DEPENDENCIES) $(EXTRA_libstrongswan_resolve_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(libstrongswan_resolve_la_LINK) $(am_libstrongswan_resolve_la_rpath) $(libstrongswan_resolve_la_OBJECTS) $(libstrongswan_resolve_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/resolve_handler.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/resolve_plugin.Plo@am__quote@
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+@am__fastdepCC_TRUE@	$(am__mv) $$depbase.Tpo $$depbase.Plo
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+	-rm -rf .libs _libs
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+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	here=`pwd`; \
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+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
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+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
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+	list='$(am__tagged_files)'; \
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES)
+installdirs:
+	for dir in "$(DESTDIR)$(plugindir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
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+install-exec: install-exec-am
+install-data: install-data-am
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+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
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+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	clean-pluginLTLIBRARIES mostlyclean-am
+
+distclean: distclean-am
+	-rm -rf ./$(DEPDIR)
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
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+dvi: dvi-am
+
+dvi-am:
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+html: html-am
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+html-am:
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+install-data-am: install-pluginLTLIBRARIES
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+install-dvi-am:
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+	-rm -rf ./$(DEPDIR)
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
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+	mostlyclean-libtool
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+.MAKE: install-am install-strip
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+.PHONY: CTAGS GTAGS TAGS all all-am check check-am clean clean-generic \
+	clean-libtool clean-noinstLTLIBRARIES clean-pluginLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
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+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-pluginLTLIBRARIES install-ps \
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+	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
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+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/libcharon/plugins/resolve/resolve_handler.c b/src/libcharon/plugins/resolve/resolve_handler.c
new file mode 100644
index 000000000..74c3960ff
--- /dev/null
+++ b/src/libcharon/plugins/resolve/resolve_handler.c
@@ -0,0 +1,380 @@
+/*
+ * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "resolve_handler.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <hydra.h>
+#include <utils/debug.h>
+#include <threading/mutex.h>
+
+/* path to resolvconf executable */
+#define RESOLVCONF_EXEC "/sbin/resolvconf"
+
+/* default prefix used for resolvconf interfaces (should have high prio) */
+#define RESOLVCONF_PREFIX "lo.inet.ipsec."
+
+typedef struct private_resolve_handler_t private_resolve_handler_t;
+
+/**
+ * Private data of an resolve_handler_t object.
+ */
+struct private_resolve_handler_t {
+
+	/**
+	 * Public resolve_handler_t interface.
+	 */
+	resolve_handler_t public;
+
+	/**
+	 * resolv.conf file to use
+	 */
+	char *file;
+
+	/**
+	 * use resolvconf instead of writing directly to resolv.conf
+	 */
+	bool use_resolvconf;
+
+	/**
+	 * prefix to be used for interface names sent to resolvconf
+	 */
+	char *iface_prefix;
+
+	/**
+	 * Mutex to access file exclusively
+	 */
+	mutex_t *mutex;
+};
+
+/**
+ * Writes the given nameserver to resolv.conf
+ */
+static bool write_nameserver(private_resolve_handler_t *this,
+							 identification_t *server, host_t *addr)
+{
+	FILE *in, *out;
+	char buf[1024];
+	size_t len;
+	bool handled = FALSE;
+
+	in = fopen(this->file, "r");
+	/* allows us to stream from in to out */
+	unlink(this->file);
+	out = fopen(this->file, "w");
+	if (out)
+	{
+		fprintf(out, "nameserver %H   # by strongSwan, from %Y\n", addr,
+				server);
+		DBG1(DBG_IKE, "installing DNS server %H to %s", addr, this->file);
+		handled = TRUE;
+
+		/* copy rest of the file */
+		if (in)
+		{
+			while ((len = fread(buf, 1, sizeof(buf), in)))
+			{
+				ignore_result(fwrite(buf, 1, len, out));
+			}
+		}
+		fclose(out);
+	}
+	if (in)
+	{
+		fclose(in);
+	}
+	return handled;
+}
+
+/**
+ * Removes the given nameserver from resolv.conf
+ */
+static void remove_nameserver(private_resolve_handler_t *this,
+							  identification_t *server, host_t *addr)
+{
+	FILE *in, *out;
+	char line[1024], matcher[512];
+
+	in = fopen(this->file, "r");
+	if (in)
+	{
+		/* allows us to stream from in to out */
+		unlink(this->file);
+		out = fopen(this->file, "w");
+		if (out)
+		{
+			snprintf(matcher, sizeof(matcher),
+					 "nameserver %H   # by strongSwan, from %Y\n",
+					 addr, server);
+
+			/* copy all, but matching line */
+			while (fgets(line, sizeof(line), in))
+			{
+				if (strpfx(line, matcher))
+				{
+					DBG1(DBG_IKE, "removing DNS server %H from %s",
+						 addr, this->file);
+				}
+				else
+				{
+					fputs(line, out);
+				}
+			}
+			fclose(out);
+		}
+		fclose(in);
+	}
+}
+
+/**
+ * Add or remove the given nameserver by invoking resolvconf.
+ */
+static bool invoke_resolvconf(private_resolve_handler_t *this,
+							  identification_t *server, host_t *addr,
+							  bool install)
+{
+	char cmd[128];
+	bool success = TRUE;
+
+	/* we use the nameserver's IP address as part of the interface name to
+	 * make them unique */
+	if (snprintf(cmd, sizeof(cmd), "%s %s %s%H", RESOLVCONF_EXEC,
+				install ? "-a" : "-d", this->iface_prefix, addr) >= sizeof(cmd))
+	{
+		return FALSE;
+	}
+
+	if (install)
+	{
+		FILE *out;
+
+		out = popen(cmd, "w");
+		if (!out)
+		{
+			return FALSE;
+		}
+		DBG1(DBG_IKE, "installing DNS server %H via resolvconf", addr);
+		fprintf(out, "nameserver %H\n", addr);
+		success = !ferror(out);
+		if (pclose(out))
+		{
+			return FALSE;
+		}
+	}
+	else
+	{
+		ignore_result(system(cmd));
+	}
+	return success;
+}
+
+METHOD(attribute_handler_t, handle, bool,
+	private_resolve_handler_t *this, ike_sa_t *ike_sa,
+	configuration_attribute_type_t type, chunk_t data)
+{
+	identification_t *server;
+	host_t *addr;
+	bool handled;
+
+	switch (type)
+	{
+		case INTERNAL_IP4_DNS:
+			addr = host_create_from_chunk(AF_INET, data, 0);
+			break;
+		case INTERNAL_IP6_DNS:
+			addr = host_create_from_chunk(AF_INET6, data, 0);
+			break;
+		default:
+			return FALSE;
+	}
+
+	if (!addr || addr->is_anyaddr(addr))
+	{
+		DESTROY_IF(addr);
+		return FALSE;
+	}
+	server = ike_sa->get_other_id(ike_sa);
+
+	this->mutex->lock(this->mutex);
+	if (this->use_resolvconf)
+	{
+		handled = invoke_resolvconf(this, server, addr, TRUE);
+	}
+	else
+	{
+		handled = write_nameserver(this, server, addr);
+	}
+	this->mutex->unlock(this->mutex);
+	addr->destroy(addr);
+
+	if (!handled)
+	{
+		DBG1(DBG_IKE, "adding DNS server failed");
+	}
+	return handled;
+}
+
+METHOD(attribute_handler_t, release, void,
+	private_resolve_handler_t *this, ike_sa_t *ike_sa,
+	configuration_attribute_type_t type, chunk_t data)
+{
+	identification_t *server;
+	host_t *addr;
+	int family;
+
+	switch (type)
+	{
+		case INTERNAL_IP4_DNS:
+			family = AF_INET;
+			break;
+		case INTERNAL_IP6_DNS:
+			family = AF_INET6;
+			break;
+		default:
+			return;
+	}
+	addr = host_create_from_chunk(family, data, 0);
+	server = ike_sa->get_other_id(ike_sa);
+
+	this->mutex->lock(this->mutex);
+	if (this->use_resolvconf)
+	{
+		invoke_resolvconf(this, server, addr, FALSE);
+	}
+	else
+	{
+		remove_nameserver(this, server, addr);
+	}
+	this->mutex->unlock(this->mutex);
+
+	addr->destroy(addr);
+}
+
+/**
+ * Attribute enumerator implementation
+ */
+typedef struct {
+	/** implements enumerator_t interface */
+	enumerator_t public;
+	/** request IPv4 DNS? */
+	bool v4;
+	/** request IPv6 DNS? */
+	bool v6;
+} attribute_enumerator_t;
+
+static bool attribute_enumerate(attribute_enumerator_t *this,
+								configuration_attribute_type_t *type,
+								chunk_t *data)
+{
+	if (this->v4)
+	{
+		*type = INTERNAL_IP4_DNS;
+		*data = chunk_empty;
+		this->v4 = FALSE;
+		return TRUE;
+	}
+	if (this->v6)
+	{
+		*type = INTERNAL_IP6_DNS;
+		*data = chunk_empty;
+		this->v6 = FALSE;
+		return TRUE;
+	}
+	return FALSE;
+}
+
+/**
+ * Check if a list has a host of given family
+ */
+static bool has_host_family(linked_list_t *list, int family)
+{
+	enumerator_t *enumerator;
+	host_t *host;
+	bool found = FALSE;
+
+	enumerator = list->create_enumerator(list);
+	while (enumerator->enumerate(enumerator, &host))
+	{
+		if (host->get_family(host) == family)
+		{
+			found = TRUE;
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	return found;
+}
+
+METHOD(attribute_handler_t, create_attribute_enumerator, enumerator_t*,
+	private_resolve_handler_t *this, ike_sa_t *ike_sa,
+	linked_list_t *vips)
+{
+	attribute_enumerator_t *enumerator;
+
+	INIT(enumerator,
+		.public = {
+			.enumerate = (void*)attribute_enumerate,
+			.destroy = (void*)free,
+		},
+		.v4 = has_host_family(vips, AF_INET),
+		.v6 = has_host_family(vips, AF_INET6),
+	);
+	return &enumerator->public;
+}
+
+METHOD(resolve_handler_t, destroy, void,
+	private_resolve_handler_t *this)
+{
+	this->mutex->destroy(this->mutex);
+	free(this);
+}
+
+/**
+ * See header
+ */
+resolve_handler_t *resolve_handler_create()
+{
+	private_resolve_handler_t *this;
+	struct stat st;
+
+	INIT(this,
+		.public = {
+			.handler = {
+				.handle = _handle,
+				.release = _release,
+				.create_attribute_enumerator = _create_attribute_enumerator,
+			},
+			.destroy = _destroy,
+		},
+		.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
+		.file = lib->settings->get_str(lib->settings, "%s.plugins.resolve.file",
+									   RESOLV_CONF, lib->ns),
+	);
+
+	if (stat(RESOLVCONF_EXEC, &st) == 0)
+	{
+		this->use_resolvconf = TRUE;
+		this->iface_prefix = lib->settings->get_str(lib->settings,
+								"%s.plugins.resolve.resolvconf.iface_prefix",
+								RESOLVCONF_PREFIX, lib->ns);
+	}
+
+	return &this->public;
+}
diff --git a/src/libcharon/plugins/resolve/resolve_handler.h b/src/libcharon/plugins/resolve/resolve_handler.h
new file mode 100644
index 000000000..77bf9781c
--- /dev/null
+++ b/src/libcharon/plugins/resolve/resolve_handler.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup resolve_handler resolve_handler
+ * @{ @ingroup resolve
+ */
+
+#ifndef RESOLVE_HANDLER_H_
+#define RESOLVE_HANDLER_H_
+
+#include <attributes/attribute_handler.h>
+
+typedef struct resolve_handler_t resolve_handler_t;
+
+/**
+ * Handle DNS configuration attributes by mangling a resolv.conf file.
+ */
+struct resolve_handler_t {
+
+	/**
+	 * Implements the attribute_handler_t interface
+	 */
+	attribute_handler_t handler;
+
+	/**
+	 * Destroy a resolve_handler_t.
+	 */
+	void (*destroy)(resolve_handler_t *this);
+};
+
+/**
+ * Create a resolve_handler instance.
+ */
+resolve_handler_t *resolve_handler_create();
+
+#endif /** RESOLVE_HANDLER_H_ @}*/
diff --git a/src/libcharon/plugins/resolve/resolve_plugin.c b/src/libcharon/plugins/resolve/resolve_plugin.c
new file mode 100644
index 000000000..193c5b602
--- /dev/null
+++ b/src/libcharon/plugins/resolve/resolve_plugin.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "resolve_plugin.h"
+#include "resolve_handler.h"
+
+#include <daemon.h>
+
+typedef struct private_resolve_plugin_t private_resolve_plugin_t;
+
+/**
+ * private data of resolve plugin
+ */
+struct private_resolve_plugin_t {
+
+	/**
+	 * implements plugin interface
+	 */
+	resolve_plugin_t public;
+
+	/**
+	 * The registered DNS attribute handler
+	 */
+	resolve_handler_t *handler;
+};
+
+METHOD(plugin_t, get_name, char*,
+	private_resolve_plugin_t *this)
+{
+	return "resolve";
+}
+
+/**
+ * Register handler
+ */
+static bool plugin_cb(private_resolve_plugin_t *this,
+					  plugin_feature_t *feature, bool reg, void *cb_data)
+{
+	if (reg)
+	{
+		charon->attributes->add_handler(charon->attributes,
+										&this->handler->handler);
+	}
+	else
+	{
+		charon->attributes->remove_handler(charon->attributes,
+										   &this->handler->handler);
+	}
+	return TRUE;
+}
+
+METHOD(plugin_t, get_features, int,
+	private_resolve_plugin_t *this, plugin_feature_t *features[])
+{
+	static plugin_feature_t f[] = {
+		PLUGIN_CALLBACK((plugin_feature_callback_t)plugin_cb, NULL),
+			PLUGIN_PROVIDE(CUSTOM, "resolve"),
+	};
+	*features = f;
+	return countof(f);
+}
+
+METHOD(plugin_t, destroy, void,
+	private_resolve_plugin_t *this)
+{
+	this->handler->destroy(this->handler);
+	free(this);
+}
+
+/*
+ * see header file
+ */
+plugin_t *resolve_plugin_create()
+{
+	private_resolve_plugin_t *this;
+
+	INIT(this,
+		.public = {
+			.plugin = {
+				.get_name = _get_name,
+				.get_features = _get_features,
+				.destroy = _destroy,
+			},
+		},
+		.handler = resolve_handler_create(),
+	);
+
+	return &this->public.plugin;
+}
diff --git a/src/libcharon/plugins/resolve/resolve_plugin.h b/src/libcharon/plugins/resolve/resolve_plugin.h
new file mode 100644
index 000000000..0148b10d7
--- /dev/null
+++ b/src/libcharon/plugins/resolve/resolve_plugin.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup resolve resolve
+ * @ingroup cplugins
+ *
+ * @defgroup resolve_plugin resolve_plugin
+ * @{ @ingroup resolve
+ */
+
+#ifndef RESOLVE_PLUGIN_H_
+#define RESOLVE_PLUGIN_H_
+
+#include <plugins/plugin.h>
+
+typedef struct resolve_plugin_t resolve_plugin_t;
+
+/**
+ * Plugin that writes received DNS servers in a resolv.conf file.
+ */
+struct resolve_plugin_t {
+
+	/**
+	 * implements plugin interface
+	 */
+	plugin_t plugin;
+};
+
+#endif /** RESOLVE_PLUGIN_H_ @}*/