[svn-upgrade] Integrating new upstream version, strongswan (4.4.0)

8 files changed, 1179 insertions, 0 deletions

diff --git a/src/libcharon/plugins/farp/Makefile.am b/src/libcharon/plugins/farp/Makefile.am
new file mode 100644
index 000000000..42cd31879
--- /dev/null
+++ b/src/libcharon/plugins/farp/Makefile.am
@@ -0,0 +1,16 @@
+
+INCLUDES = -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/libhydra \
+	-I$(top_srcdir)/src/libcharon
+
+AM_CFLAGS = -rdynamic
+
+if MONOLITHIC
+noinst_LTLIBRARIES = libstrongswan-farp.la
+else
+plugin_LTLIBRARIES = libstrongswan-farp.la
+endif
+
+libstrongswan_farp_la_SOURCES = farp_plugin.h farp_plugin.c \
+	farp_listener.h farp_listener.c farp_spoofer.h farp_spoofer.c
+
+libstrongswan_farp_la_LDFLAGS = -module -avoid-version
diff --git a/src/libcharon/plugins/farp/Makefile.in b/src/libcharon/plugins/farp/Makefile.in
new file mode 100644
index 000000000..20ac77080
--- /dev/null
+++ b/src/libcharon/plugins/farp/Makefile.in
@@ -0,0 +1,587 @@
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+# 2003, 2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation,
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+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
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+	-I$(top_srcdir)/src/libcharon
+
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+	farp_listener.h farp_listener.c farp_spoofer.h farp_spoofer.c
+
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+	    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
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	$(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	  install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	  `test -z '$(STRIP)' || \
+	    echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(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
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am: install-pluginLTLIBRARIES
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -rf ./$(DEPDIR)
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-pluginLTLIBRARIES
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS all all-am check check-am clean clean-generic \
+	clean-libtool clean-noinstLTLIBRARIES clean-pluginLTLIBRARIES \
+	ctags distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am 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 install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags uninstall uninstall-am \
+	uninstall-pluginLTLIBRARIES
+
+
+# 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/farp/farp_listener.c b/src/libcharon/plugins/farp/farp_listener.c
new file mode 100644
index 000000000..8eed49778
--- /dev/null
+++ b/src/libcharon/plugins/farp/farp_listener.c
@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * 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 "farp_listener.h"
+
+#include <utils/hashtable.h>
+#include <threading/rwlock.h>
+
+typedef struct private_farp_listener_t private_farp_listener_t;
+
+/**
+ * Private data of an farp_listener_t object.
+ */
+struct private_farp_listener_t {
+
+	/**
+	 * Public farp_listener_t interface.
+	 */
+	farp_listener_t public;
+
+	/**
+	 * Hashtable with active virtual IPs
+	 */
+	hashtable_t *ips;
+
+	/**
+	 * RWlock for IP list
+	 */
+	rwlock_t *lock;
+};
+
+/**
+ * Hashtable hash function
+ */
+static u_int hash(host_t *key)
+{
+	return chunk_hash(key->get_address(key));
+}
+
+/**
+ * Hashtable equals function
+ */
+static bool equals(host_t *a, host_t *b)
+{
+	return a->ip_equals(a, b);
+}
+
+METHOD(listener_t, ike_updown, bool,
+	private_farp_listener_t *this, ike_sa_t *ike_sa, bool up)
+{
+	if (!up)
+	{
+		host_t *ip;
+
+		ip = ike_sa->get_virtual_ip(ike_sa, FALSE);
+		if (ip)
+		{
+			this->lock->write_lock(this->lock);
+			ip = this->ips->remove(this->ips, ip);
+			this->lock->unlock(this->lock);
+			DESTROY_IF(ip);
+		}
+	}
+	return TRUE;
+}
+
+METHOD(listener_t, message_hook, bool,
+	private_farp_listener_t *this, ike_sa_t *ike_sa,
+	message_t *message, bool incoming)
+{
+	if (ike_sa->get_state(ike_sa) == IKE_ESTABLISHED &&
+		message->get_exchange_type(message) == IKE_AUTH &&
+		!message->get_request(message))
+	{
+		host_t *ip;
+
+		ip = ike_sa->get_virtual_ip(ike_sa, FALSE);
+		if (ip)
+		{
+			ip = ip->clone(ip);
+			this->lock->write_lock(this->lock);
+			ip = this->ips->put(this->ips, ip, ip);
+			this->lock->unlock(this->lock);
+			DESTROY_IF(ip);
+		}
+	}
+	return TRUE;
+}
+
+METHOD(farp_listener_t, is_active, bool,
+	private_farp_listener_t *this, host_t *ip)
+{
+	bool active;
+
+	this->lock->read_lock(this->lock);
+	active = this->ips->get(this->ips, ip) != NULL;
+	this->lock->unlock(this->lock);
+	return active;
+}
+
+METHOD(farp_listener_t, destroy, void,
+	private_farp_listener_t *this)
+{
+	enumerator_t *enumerator;
+	host_t *key, *value;
+
+	enumerator = this->ips->create_enumerator(this->ips);
+	while (enumerator->enumerate(enumerator, &key, &value))
+	{
+		value->destroy(value);
+	}
+	enumerator->destroy(enumerator);
+	this->ips->destroy(this->ips);
+
+	this->lock->destroy(this->lock);
+	free(this);
+}
+
+/**
+ * See header
+ */
+farp_listener_t *farp_listener_create()
+{
+	private_farp_listener_t *this;
+
+	INIT(this,
+		.public = {
+			.listener = {
+				.ike_updown = _ike_updown,
+				.message = _message_hook,
+			},
+			.is_active = _is_active,
+			.destroy = _destroy,
+		},
+		.ips = hashtable_create((hashtable_hash_t)hash,
+								(hashtable_equals_t)equals, 8),
+		.lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
+	);
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/plugins/farp/farp_listener.h b/src/libcharon/plugins/farp/farp_listener.h
new file mode 100644
index 000000000..bd96d7a1c
--- /dev/null
+++ b/src/libcharon/plugins/farp/farp_listener.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * 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 farp_listener farp_listener
+ * @{ @ingroup farp
+ */
+
+#ifndef FARP_LISTENER_H_
+#define FARP_LISTENER_H_
+
+#include <utils/host.h>
+#include <bus/listeners/listener.h>
+
+typedef struct farp_listener_t farp_listener_t;
+
+/**
+ * Listener to register the set of IPs we spoof ARP responses for.
+ */
+struct farp_listener_t {
+
+	/**
+	 * Implements listener_t interface.
+	 */
+	listener_t listener;
+
+	/**
+	 * Check if a given IP is currently used as virtual IP by a peer.
+	 *
+	 * @param ip		IP to check
+	 * @return			TRUE if IP is an active virtual IP
+	 */
+	bool (*is_active)(farp_listener_t *this, host_t *ip);
+
+	/**
+	 * Destroy a farp_listener_t.
+	 */
+	void (*destroy)(farp_listener_t *this);
+};
+
+/**
+ * Create a farp_listener instance.
+ */
+farp_listener_t *farp_listener_create();
+
+#endif /** FARP_LISTENER_H_ @}*/
diff --git a/src/libcharon/plugins/farp/farp_plugin.c b/src/libcharon/plugins/farp/farp_plugin.c
new file mode 100644
index 000000000..01c2a39c8
--- /dev/null
+++ b/src/libcharon/plugins/farp/farp_plugin.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * 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 "farp_plugin.h"
+
+#include "farp_listener.h"
+#include "farp_spoofer.h"
+
+#include <daemon.h>
+
+typedef struct private_farp_plugin_t private_farp_plugin_t;
+
+/**
+ * private data of farp plugin
+ */
+struct private_farp_plugin_t {
+
+	/**
+	 * implements plugin interface
+	 */
+	farp_plugin_t public;
+
+	/**
+	 * Listener registering active virtual IPs
+	 */
+	farp_listener_t *listener;
+
+	/**
+	 * Spoofer listening and spoofing ARP messages
+	 */
+	farp_spoofer_t *spoofer;
+};
+
+METHOD(plugin_t, destroy, void,
+	private_farp_plugin_t *this)
+{
+	DESTROY_IF(this->spoofer);
+	charon->bus->remove_listener(charon->bus, &this->listener->listener);
+	this->listener->destroy(this->listener);
+	free(this);
+}
+
+/**
+ * Plugin constructor
+ */
+plugin_t *farp_plugin_create()
+{
+	private_farp_plugin_t *this;
+
+	INIT(this,
+		.public.plugin.destroy = _destroy,
+		.listener = farp_listener_create(),
+	);
+
+	charon->bus->add_listener(charon->bus, &this->listener->listener);
+
+	this->spoofer = farp_spoofer_create(this->listener);
+	if (!this->spoofer)
+	{
+		destroy(this);
+		return NULL;
+	}
+	return &this->public.plugin;
+}
+
diff --git a/src/libcharon/plugins/farp/farp_plugin.h b/src/libcharon/plugins/farp/farp_plugin.h
new file mode 100644
index 000000000..0246fcc2a
--- /dev/null
+++ b/src/libcharon/plugins/farp/farp_plugin.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * 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 farp farp
+ * @ingroup cplugins
+ *
+ * @defgroup farp_plugin farp_plugin
+ * @{ @ingroup farp
+ */
+
+#ifndef FARP_PLUGIN_H_
+#define FARP_PLUGIN_H_
+
+#include <plugins/plugin.h>
+
+typedef struct farp_plugin_t farp_plugin_t;
+
+/**
+ * ARP faking plugin that responds to ARP requests to peers virtual IP.
+ */
+struct farp_plugin_t {
+
+	/**
+	 * implements plugin interface
+	 */
+	plugin_t plugin;
+};
+
+#endif /** FARP_PLUGIN_H_ @}*/
diff --git a/src/libcharon/plugins/farp/farp_spoofer.c b/src/libcharon/plugins/farp/farp_spoofer.c
new file mode 100644
index 000000000..29e64e32d
--- /dev/null
+++ b/src/libcharon/plugins/farp/farp_spoofer.c
@@ -0,0 +1,198 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * 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 "farp_spoofer.h"
+
+#include <errno.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <linux/if_arp.h>
+#include <linux/if_ether.h>
+#include <linux/filter.h>
+#include <sys/ioctl.h>
+
+#include <daemon.h>
+#include <threading/thread.h>
+#include <processing/jobs/callback_job.h>
+
+typedef struct private_farp_spoofer_t private_farp_spoofer_t;
+
+/**
+ * Private data of an farp_spoofer_t object.
+ */
+struct private_farp_spoofer_t {
+
+	/**
+	 * Public farp_spoofer_t interface.
+	 */
+	farp_spoofer_t public;
+
+	/**
+	 * Listener that knows active addresses
+	 */
+	farp_listener_t *listener;
+
+	/**
+	 * Callback job to read ARP requests
+	 */
+	callback_job_t *job;
+
+	/**
+	 * RAW socket for ARP requests
+	 */
+	int skt;
+};
+
+/**
+ * IP over Ethernet ARP message
+ */
+typedef struct __attribute__((packed)) {
+	u_int16_t hardware_type;
+	u_int16_t protocol_type;
+	u_int8_t hardware_size;
+	u_int8_t protocol_size;
+	u_int16_t opcode;
+	u_int8_t sender_mac[6];
+	u_int8_t sender_ip[4];
+	u_int8_t target_mac[6];
+	u_int8_t target_ip[4];
+} arp_t;
+
+/**
+ * Send faked ARP response
+ */
+static void send_arp(private_farp_spoofer_t *this,
+					 arp_t *arp, struct sockaddr_ll *addr)
+{
+	struct ifreq req;
+	char tmp[4];
+
+	req.ifr_ifindex = addr->sll_ifindex;
+	if (ioctl(this->skt, SIOCGIFNAME, &req) == 0 &&
+		ioctl(this->skt, SIOCGIFHWADDR, &req) == 0 &&
+		req.ifr_hwaddr.sa_family == ARPHRD_ETHER)
+	{
+		memcpy(arp->target_mac, arp->sender_mac, 6);
+		memcpy(arp->sender_mac, req.ifr_hwaddr.sa_data, 6);
+
+		memcpy(tmp, arp->sender_ip, 4);
+		memcpy(arp->sender_ip, arp->target_ip, 4);
+		memcpy(arp->target_ip, tmp, 4);
+
+		arp->opcode = htons(ARPOP_REPLY);
+
+		sendto(this->skt, arp, sizeof(*arp), 0,
+			   (struct sockaddr*)addr, sizeof(*addr));
+	}
+}
+
+/**
+ * ARP request receiving
+ */
+static job_requeue_t receive_arp(private_farp_spoofer_t *this)
+{
+	struct sockaddr_ll addr;
+	socklen_t addr_len = sizeof(addr);
+	arp_t arp;
+	int oldstate;
+	ssize_t len;
+	host_t *ip;
+
+	oldstate = thread_cancelability(TRUE);
+	len = recvfrom(this->skt, &arp, sizeof(arp), 0,
+				   (struct sockaddr*)&addr, &addr_len);
+	thread_cancelability(oldstate);
+
+	if (len == sizeof(arp))
+	{
+		ip = host_create_from_chunk(AF_INET,
+									chunk_create((char*)&arp.target_ip, 4), 0);
+		if (ip)
+		{
+			if (this->listener->is_active(this->listener, ip))
+			{
+				send_arp(this, &arp, &addr);
+			}
+			ip->destroy(ip);
+		}
+	}
+
+	return JOB_REQUEUE_DIRECT;
+}
+
+METHOD(farp_spoofer_t, destroy, void,
+	private_farp_spoofer_t *this)
+{
+	this->job->cancel(this->job);
+	close(this->skt);
+	free(this);
+}
+
+/**
+ * See header
+ */
+farp_spoofer_t *farp_spoofer_create(farp_listener_t *listener)
+{
+	private_farp_spoofer_t *this;
+	struct sock_filter arp_request_filter_code[] = {
+		BPF_STMT(BPF_LD+BPF_H+BPF_ABS, offsetof(arp_t, protocol_type)),
+		BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, ETH_P_IP, 0, 9),
+		BPF_STMT(BPF_LD+BPF_B+BPF_ABS, offsetof(arp_t, hardware_size)),
+		BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 6, 0, 7),
+		BPF_STMT(BPF_LD+BPF_B+BPF_ABS, offsetof(arp_t, protocol_size)),
+		BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 4, 0, 4),
+		BPF_STMT(BPF_LD+BPF_H+BPF_ABS, offsetof(arp_t, opcode)),
+		BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, ARPOP_REQUEST, 0, 3),
+		BPF_STMT(BPF_LD+BPF_W+BPF_LEN, 0),
+		BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 28, 0, 1),
+		BPF_STMT(BPF_RET+BPF_A, 0),
+		BPF_STMT(BPF_RET+BPF_K, 0),
+	};
+	struct sock_fprog arp_request_filter = {
+		sizeof(arp_request_filter_code) / sizeof(struct sock_filter),
+		arp_request_filter_code,
+	};
+
+	INIT(this,
+		.public = {
+			.destroy = _destroy,
+		},
+		.listener = listener,
+	);
+
+	this->skt = socket(AF_PACKET, SOCK_DGRAM, htons(ETH_P_ARP));
+	if (this->skt == -1)
+	{
+		DBG1(DBG_NET, "opening ARP packet socket failed: %s", strerror(errno));
+		free(this);
+		return NULL;
+	}
+
+	if (setsockopt(this->skt, SOL_SOCKET, SO_ATTACH_FILTER,
+				   &arp_request_filter, sizeof(arp_request_filter)) < 0)
+	{
+		DBG1(DBG_NET, "installing ARP packet filter failed: %s", strerror(errno));
+		close(this->skt);
+		free(this);
+		return NULL;
+	}
+
+	this->job = callback_job_create((callback_job_cb_t)receive_arp,
+									this, NULL, NULL);
+	charon->processor->queue_job(charon->processor, (job_t*)this->job);
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/plugins/farp/farp_spoofer.h b/src/libcharon/plugins/farp/farp_spoofer.h
new file mode 100644
index 000000000..c91fb3b96
--- /dev/null
+++ b/src/libcharon/plugins/farp/farp_spoofer.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * 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 farp_spoofer farp_spoofer
+ * @{ @ingroup farp
+ */
+
+#ifndef FARP_SPOOFER_H_
+#define FARP_SPOOFER_H_
+
+#include "farp_listener.h"
+
+typedef struct farp_spoofer_t farp_spoofer_t;
+
+/**
+ * Listen to ARP requests and spoof responses, if required.
+ */
+struct farp_spoofer_t {
+
+	/**
+	 * Destroy a farp_spoofer_t.
+	 */
+	void (*destroy)(farp_spoofer_t *this);
+};
+
+/**
+ * Create a farp_spoofer instance.
+ *
+ * @param listener		listener to check for addresses to spoof
+ * @return				spoofer instance
+ */
+farp_spoofer_t *farp_spoofer_create(farp_listener_t *listener);
+
+#endif /** FARP_SPOOFER_H_ @}*/