15 files changed, 4282 insertions, 0 deletions

diff --git a/src/dumm/Makefile.am b/src/dumm/Makefile.am
new file mode 100644
index 000000000..3356e7a57
--- /dev/null
+++ b/src/dumm/Makefile.am
@@ -0,0 +1,12 @@
+lib_LTLIBRARIES = libdumm.la
+ipsec_PROGRAMS = dumm
+
+libdumm_la_SOURCES = dumm.c dumm.h guest.c guest.h iface.c iface.h bridge.c bridge.h mconsole.c mconsole.h cowfs.h cowfs.c
+dumm_SOURCES = main.c
+
+libdumm_la_LIBADD = $(top_builddir)/src/libstrongswan/libstrongswan.la -lpthread -lbridge -lfuse -lutil ${xml_LIBS}
+dumm_LDADD = -ldumm -lreadline
+
+INCLUDES = -I$(top_srcdir)/src/libstrongswan ${xml_CFLAGS}
+
+AM_CFLAGS = -D_FILE_OFFSET_BITS=64
diff --git a/src/dumm/Makefile.in b/src/dumm/Makefile.in
new file mode 100644
index 000000000..94ad6003a
--- /dev/null
+++ b/src/dumm/Makefile.in
@@ -0,0 +1,538 @@
+# Makefile.in generated by automake 1.10 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+# 2003, 2004, 2005, 2006  Free Software Foundation, Inc.
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
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+
+
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+install-data-am: install-ipsecPROGRAMS
+
+install-dvi: install-dvi-am
+
+install-exec-am: install-libLTLIBRARIES
+
+install-html: install-html-am
+
+install-info: install-info-am
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-ps: install-ps-am
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -rf ./$(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-ipsecPROGRAMS uninstall-libLTLIBRARIES
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS all all-am check check-am clean clean-generic \
+	clean-ipsecPROGRAMS clean-libLTLIBRARIES clean-libtool 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-ipsecPROGRAMS install-libLTLIBRARIES \
+	install-man install-pdf install-pdf-am 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-ipsecPROGRAMS uninstall-libLTLIBRARIES
+
+# 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/dumm/bridge.c b/src/dumm/bridge.c
new file mode 100644
index 000000000..c6068e60c
--- /dev/null
+++ b/src/dumm/bridge.c
@@ -0,0 +1,171 @@
+/*
+ * Copyright (C) 2007 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 <sys/types.h>
+#include <libbridge.h>
+
+#include <debug.h>
+#include <utils/linked_list.h>
+
+#include "bridge.h"
+
+typedef struct private_bridge_t private_bridge_t;
+
+struct private_bridge_t {
+	/** public interface */
+	bridge_t public;
+	/** device name */
+	char *name;
+	/** list of attached interfaces */
+	linked_list_t *ifaces;
+};
+	
+/**
+ * Implementation of bridge_t.get_name.
+ */
+static char* get_name(private_bridge_t *this)
+{
+	return this->name;
+}
+
+/**
+ * Implementation of bridge_t.create_iface_iterator.
+ */
+static iterator_t* create_iface_iterator(private_bridge_t *this)
+{
+	return this->ifaces->create_iterator(this->ifaces, TRUE);
+}
+
+/**
+ * Implementation of bridge_t.disconnect_iface.
+ */
+static bool disconnect_iface(private_bridge_t *this, iface_t *iface)
+{
+	iterator_t *iterator;
+	iface_t *current;
+	bool good = FALSE;
+
+	iterator = this->ifaces->create_iterator(this->ifaces, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		if (current == iface)
+		{
+			if (br_del_interface(this->name, iface->get_hostif(iface)) != 0)
+			{
+				DBG1("removing iface '%s' from bridge '%s' in kernel failed: %m",
+					 iface->get_hostif(iface), this->name);
+			}
+			else
+			{
+				iface->set_bridge(iface, NULL);
+				good = TRUE;
+			}
+			break;
+		}
+	}
+	if (iface != current)
+	{
+		DBG1("iface '%s' not found on bridge '%s'", iface->get_hostif(iface),
+			 this->name);
+	}
+	iterator->destroy(iterator);
+	return good;
+}
+
+/**
+ * Implementation of bridge_t.connect_iface.
+ */
+static bool connect_iface(private_bridge_t *this, iface_t *iface)
+{
+	if (br_add_interface(this->name, iface->get_hostif(iface)) != 0)
+	{
+		DBG1("adding iface '%s' to bridge '%s' failed: %m",
+			 iface->get_hostif(iface), this->name);
+		return FALSE;
+	}
+	iface->set_bridge(iface, &this->public);
+	this->ifaces->insert_last(this->ifaces, iface);
+	return TRUE;
+}
+
+/**
+ * instance counter to (de-)initialize libbridge
+ */
+static int instances = 0;
+
+/**
+ * unregister an interface from bridge
+ */
+static void unregister(iface_t *iface)
+{
+	iface->set_bridge(iface, NULL);
+}
+
+/**
+ * Implementation of bridge_t.destroy.
+ */
+static void destroy(private_bridge_t *this)
+{
+	this->ifaces->invoke_function(this->ifaces, (void(*)(void*))unregister);
+	this->ifaces->destroy(this->ifaces);
+	if (br_del_bridge(this->name) != 0)
+	{
+		DBG1("deleting bridge '%s' from kernel failed: %m", this->name);
+	}
+	free(this->name);
+	free(this);
+	if (--instances == 0)
+	{
+		br_shutdown();
+	}
+}
+
+/**
+ * create the bridge instance
+ */
+bridge_t *bridge_create(char *name)
+{
+	private_bridge_t *this;
+	
+	if (instances == 0)
+	{
+		if (br_init() != 0)
+		{
+			DBG1("libbridge initialization failed: %m");
+			return NULL;
+		}
+	}
+	
+	this = malloc_thing(private_bridge_t);
+	this->public.get_name = (char*(*)(bridge_t*))get_name;
+	this->public.create_iface_iterator = (iterator_t*(*)(bridge_t*))create_iface_iterator;
+	this->public.disconnect_iface = (bool(*)(bridge_t*, iface_t *iface))disconnect_iface;
+	this->public.connect_iface = (bool(*)(bridge_t*, iface_t *iface))connect_iface;
+	this->public.destroy = (void*)destroy;
+
+	if (br_add_bridge(name) != 0)
+	{
+		DBG1("creating bridge '%s' failed: %m", name);
+		free(this);
+		return NULL;
+	}
+
+	this->name = strdup(name);
+	this->ifaces = linked_list_create();
+
+	instances++;
+	return &this->public;
+}
+
diff --git a/src/dumm/bridge.h b/src/dumm/bridge.h
new file mode 100644
index 000000000..6d28ed376
--- /dev/null
+++ b/src/dumm/bridge.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2007 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.
+ */
+
+#ifndef BRIDGE_H
+#define BRIDGE_H
+
+#include <library.h>
+#include <utils/iterator.h>
+
+typedef struct bridge_t bridge_t;
+
+#include "iface.h"
+
+/**
+ * @brief Interface in a guest, connected to a tap device on the host.
+ */
+struct bridge_t {
+	
+	/**
+	 * @brief Get the name of the bridge.
+	 *
+	 * @return				name of the bridge
+	 */
+	char* (*get_name)(bridge_t *this);
+	
+	/**
+	 * @brief Add an interface to a bridge.
+	 *
+	 * @param iface			interface to add
+	 * @return				TRUE if interface added
+	 */
+	bool (*connect_iface)(bridge_t *this, iface_t *iface);
+	
+	/**
+	 * @brief Remove an interface from a bridge.
+	 *
+	 * @param iface			interface to remove
+	 * @return				TRUE if interface removed
+	 */
+	bool (*disconnect_iface)(bridge_t *this, iface_t *iface);
+	
+	/**
+	 * @brief Create an iterator over all interfaces.
+	 *
+	 * @return 				iterator over iface_t's
+	 */
+	iterator_t* (*create_iface_iterator)(bridge_t *this);	
+	
+	/**
+	 * @brief Destroy a bridge
+	 */
+	void (*destroy) (bridge_t *this);
+};
+
+/**
+ * @brief Create a new bridge.
+ *
+ * @param name		name of the bridge to create
+ * @return			bridge, NULL if failed
+ */
+bridge_t *bridge_create(char *name);
+
+#endif /* BRIDGE_H */
+
diff --git a/src/dumm/cowfs.c b/src/dumm/cowfs.c
new file mode 100644
index 000000000..4c16c7c5d
--- /dev/null
+++ b/src/dumm/cowfs.c
@@ -0,0 +1,913 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ * Copyright (C) 2001-2007 Miklos Szeredi
+ *
+ * Based on example shipped with FUSE.
+ *
+ * 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.
+ */
+
+
+#define FUSE_USE_VERSION 26
+#define _GNU_SOURCE
+
+#include <fuse.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <pthread.h>
+
+#include "cowfs.h"
+
+#include <library.h>
+#include <debug.h>
+
+/** define _XOPEN_SOURCE 500 fails when using libstrongswan, define popen */
+extern ssize_t pread(int fd, void *buf, size_t count, off_t offset);
+extern ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
+
+typedef struct private_cowfs_t private_cowfs_t;
+
+struct private_cowfs_t {
+	/** public cowfs interface */
+	cowfs_t public;
+	/** fuse channel to mountpoint */
+	struct fuse_chan *chan;
+	/** fuse handle */
+	struct fuse *fuse;
+	/** mountpoint of cowfs FUSE */
+	char *mount;
+	/** master filesystem path */
+	char *master;
+	/** host filesystem path */
+	char *host;
+	/** overlay filesystem path */
+	char *over;
+	/** fd of read only master filesystem */
+	int master_fd;
+	/** copy on write overlay to master */
+	int host_fd;
+	/** optional COW overlay */
+	int over_fd;
+	/** thread processing FUSE */
+	pthread_t thread;
+};
+
+/**
+ * get this pointer stored in fuse context
+ */
+static private_cowfs_t *get_this()
+{
+	return (fuse_get_context())->private_data;
+}
+
+/**
+ * make a path relative
+ */
+static void rel(const char **path)
+{
+	if (**path == '/')
+	{
+		(*path)++;
+	}
+	if (**path == '\0')
+	{
+		*path = ".";
+	}
+}
+
+/**
+ * get the highest overlay in which path exists
+ */
+static int get_rd(const char *path)
+{
+	private_cowfs_t *this = get_this();
+
+	if (this->over_fd > 0 && faccessat(this->over_fd, path, F_OK, 0) == 0)
+	{
+		return this->over_fd;
+	}
+	if (faccessat(this->host_fd, path, F_OK, 0) == 0)
+	{
+		return this->host_fd;
+	}
+	return this->master_fd;
+}
+
+/**
+ * get the highest overlay available, to write something
+ */
+static int get_wr(const char *path)
+{
+	private_cowfs_t *this = get_this();
+	if (this->over_fd > 0)
+	{
+		return this->over_fd;
+	}
+	return this->host_fd;
+}
+
+/**
+ * create full "path" at "wr" the same way they exist at "rd"
+ */
+static bool clone_path(int rd, int wr, const char *path)
+{
+	char *pos, *full;
+	struct stat st;
+	full = strdupa(path);
+	pos = full;
+	
+	while ((pos = strchr(pos, '/')))
+	{
+		*pos = '\0';
+		if (fstatat(wr, full, &st, 0) < 0)
+		{
+			/* TODO: handle symlinks!? */
+			if (fstatat(rd, full, &st, 0) < 0)
+			{
+				return FALSE;
+			}
+			if (mkdirat(wr, full, st.st_mode) < 0)
+			{
+				return FALSE;
+			}
+		}
+		*pos = '/';
+		pos++;
+	}
+	return TRUE;
+}
+
+/**
+ * copy a (special) file from a readonly to a read-write overlay
+ */
+static int copy(const char *path)
+{
+	char *buf[4096];
+	int len;
+	int rd, wr;
+	int from, to;
+	struct stat st;
+	
+	rd = get_rd(path);
+	wr = get_wr(path);
+	
+	if (rd == wr)
+	{
+		/* already writeable */
+		return wr;
+	}
+	if (fstatat(rd, path, &st, 0) < 0)
+	{
+		return -1;
+	}
+	if (!clone_path(rd, wr, path))
+	{
+		return -1;
+	}
+	if (mknodat(wr, path, st.st_mode, st.st_rdev) < 0)
+	{
+		return -1;
+	}
+	/* copy if no special file */
+	if (st.st_size)
+	{
+		from = openat(rd, path, O_RDONLY, st.st_mode);
+		if (from < 0)
+		{
+			return -1;
+		}
+		to = openat(wr, path, O_WRONLY , st.st_mode);
+		if (to < 0)
+		{
+			close(from);
+			return -1;
+		}
+		while ((len = read(from, buf, sizeof(buf))) > 0)
+		{
+			if (write(to, buf, len) < len)
+			{
+				/* TODO: only on len < 0 ? */
+				close(from);
+				close(to);
+				return -1;
+			}
+		}
+		close(from);
+		close(to);
+		if (len < 0)
+		{
+			return -1;
+		}
+	}
+	return wr;
+}
+
+/**
+ * FUSE getattr method
+ */
+static int cowfs_getattr(const char *path, struct stat *stbuf)
+{
+	rel(&path);
+
+	if (fstatat(get_rd(path), path, stbuf, AT_SYMLINK_NOFOLLOW) < 0)
+	{
+		return -errno;
+	}
+	return 0;
+}
+
+/**
+ * FUSE access method
+ */
+static int cowfs_access(const char *path, int mask)
+{
+	rel(&path);
+	
+	if (faccessat(get_rd(path), path, mask, 0) < 0)
+	{
+		return -errno;
+	}
+    return 0;
+}
+
+/**
+ * FUSE readlink method
+ */
+static int cowfs_readlink(const char *path, char *buf, size_t size)
+{
+	int res;
+
+	rel(&path);
+	
+	res = readlinkat(get_rd(path), path, buf, size - 1);
+    if (res < 0)
+    {
+        return -errno;
+	}
+    buf[res] = '\0';
+    return 0;
+}
+
+/**
+ * get a directory stream of two concatenated paths
+ */
+static DIR* get_dir(char *dir, const char *subdir)
+{
+	char *full;
+	
+	if (dir == NULL)
+	{
+		return NULL;
+	}
+	
+	full = alloca(strlen(dir) + strlen(subdir) + 1);
+	strcpy(full, dir);
+	strcat(full, subdir);
+	
+	return opendir(full);
+}
+
+/**
+ * check if a directory stream contains a directory
+ */
+static bool contains_dir(DIR *d, char *dirname)
+{
+	if (d)
+	{
+		struct dirent *ent;
+		
+		rewinddir(d);
+		while ((ent = readdir(d)))
+		{
+			if (streq(ent->d_name, dirname))
+			{
+				return TRUE;
+			}
+		}
+	}
+	return FALSE;
+}
+
+/**
+ * FUSE readdir method
+ */
+static int cowfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
+						 off_t offset, struct fuse_file_info *fi)
+{
+	private_cowfs_t *this = get_this();
+	DIR *d1, *d2, *d3;
+	struct stat st;
+	struct dirent *ent;
+	
+	memset(&st, 0, sizeof(st));
+	
+	d1 = get_dir(this->master, path);
+	d2 = get_dir(this->host, path);
+	d3 = get_dir(this->over, path);
+	
+	if (d1)
+	{
+		while ((ent = readdir(d1)))
+		{
+			if (!contains_dir(d2, ent->d_name) &&
+				!contains_dir(d3, ent->d_name))
+			{
+				st.st_ino = ent->d_ino;
+				st.st_mode = ent->d_type << 12;
+	        	filler(buf, ent->d_name, &st, 0);
+			}
+		}
+		closedir(d1);
+	}
+	if (d2)
+	{
+		rewinddir(d2);
+		while ((ent = readdir(d2)))
+		{
+			if (!contains_dir(d3, ent->d_name))
+			{
+				st.st_ino = ent->d_ino;
+				st.st_mode = ent->d_type << 12;
+	        	filler(buf, ent->d_name, &st, 0);
+			}
+		}
+		closedir(d2);
+	}
+	if (d3)
+	{
+		rewinddir(d3);
+		while ((ent = readdir(d3)))
+		{
+			st.st_ino = ent->d_ino;
+			st.st_mode = ent->d_type << 12;
+        	filler(buf, ent->d_name, &st, 0);
+		}
+		closedir(d3);
+	}
+    return 0;
+}
+
+/**
+ * FUSE mknod method
+ */
+static int cowfs_mknod(const char *path, mode_t mode, dev_t rdev)
+{
+	int fd;
+	rel(&path);
+
+	fd = get_wr(path);
+	if (!clone_path(get_rd(path), fd, path))
+	{
+		return -errno;
+	}
+
+	if (mknodat(fd, path, mode, rdev) < 0)
+	{
+		return -errno;
+	}
+	return 0;
+}
+
+/**
+ * FUSE mkdir method
+ */
+static int cowfs_mkdir(const char *path, mode_t mode)
+{
+	int fd;
+	rel(&path);
+
+	fd = get_wr(path);
+	if (!clone_path(get_rd(path), fd, path))
+	{
+		return -errno;
+	}
+	if (mkdirat(fd, path, mode) < 0)
+	{
+		return -errno;
+	}
+	return 0;
+}
+
+/**
+ * FUSE unlink method
+ */
+static int cowfs_unlink(const char *path)
+{
+	rel(&path);
+	
+	/* TODO: whiteout master */
+	if (unlinkat(get_wr(path), path, 0) < 0)
+	{
+		return -errno;
+	}
+    return 0;
+}
+
+/**
+ * FUSE rmdir method
+ */
+static int cowfs_rmdir(const char *path)
+{
+	rel(&path);
+	
+	/* TODO: whiteout master */
+	if (unlinkat(get_wr(path), path, AT_REMOVEDIR) < 0)
+	{
+		return -errno;
+	}
+    return 0;
+}
+
+/**
+ * FUSE symlink method
+ */
+static int cowfs_symlink(const char *from, const char *to)
+{
+	int fd;
+	const char *fromrel = from;
+
+	rel(&to);
+	rel(&fromrel);
+
+	fd = get_wr(to);
+	if (!clone_path(get_rd(fromrel), fd, fromrel))
+	{
+		return -errno;
+	}
+	if (symlinkat(from, fd, to) < 0)
+	{
+		return -errno;
+	}
+	return 0;
+}
+
+/**
+ * FUSE rename method
+ */
+static int cowfs_rename(const char *from, const char *to)
+{
+	int fd;
+	private_cowfs_t *this = get_this();
+
+	rel(&from);
+	rel(&to);
+
+	fd = get_rd(from);
+	if (fd == this->master_fd)
+	{
+		fd = copy(from);
+		if (fd < 0)
+		{
+			return -errno;
+		}
+	}
+	
+	if (renameat(fd, from, get_wr(to), to) < 0)
+	{
+	    return -errno;
+	}
+	return 0;
+}
+
+/**
+ * FUSE link method
+ */
+static int cowfs_link(const char *from, const char *to)
+{
+	int rd, wr;
+
+	rel(&from);
+	rel(&to);
+	
+	rd = get_rd(from);
+	wr = get_wr(to);
+	
+	if (!clone_path(rd, wr, to))
+	{
+		DBG1("cloning path '%s' failed", to);
+		return -errno;
+	}
+    if (linkat(rd, from, wr, to, 0) < 0)
+    {
+		DBG1("linking '%s' to '%s' failed", from, to);
+    	return -errno;
+	}
+    return 0;
+}
+
+/**
+ * FUSE chmod method
+ */
+static int cowfs_chmod(const char *path, mode_t mode)
+{
+	int fd;
+	struct stat st;
+	private_cowfs_t *this = get_this();
+	
+	rel(&path);
+	fd = get_rd(path);
+	if (fd == this->master_fd)
+	{
+		if (fstatat(fd, path, &st, 0) < 0)
+		{
+			return -errno;
+		}
+		if (st.st_mode == mode)
+		{
+			return 0;
+		}
+		fd = copy(path);
+		if (fd < 0)
+		{
+			return -errno;
+		}
+	}
+	if (fchmodat(fd, path, mode, 0) < 0)
+	{
+		return -errno;
+	}
+	return 0;
+}
+
+/**
+ * FUSE chown method
+ */
+static int cowfs_chown(const char *path, uid_t uid, gid_t gid)
+{
+	int fd;
+	struct stat st;
+	private_cowfs_t *this = get_this();
+	
+	rel(&path);
+	fd = get_rd(path);
+	if (fd == this->master_fd)
+	{
+		if (fstatat(fd, path, &st, 0) < 0)
+		{
+			return -errno;
+		}
+		if (st.st_uid == uid && st.st_gid == gid)
+		{
+			return 0;
+		}
+		fd = copy(path);
+		if (fd < 0)
+		{
+			return -errno;
+		}
+	}
+	if (fchownat(fd, path, uid, gid, AT_SYMLINK_NOFOLLOW) < 0)
+	{
+		return -errno;
+	}
+	return 0;
+}
+
+/**
+ * FUSE truncate method
+ */
+static int cowfs_truncate(const char *path, off_t size)
+{
+	int fd;
+	struct stat st;
+	
+	private_cowfs_t *this = get_this();
+
+	rel(&path);
+	fd = get_rd(path);
+	if (fd == this->master_fd)
+	{
+		if (fstatat(fd, path, &st, 0) < 0)
+		{
+			return -errno;
+		}
+		if (st.st_size == size)
+		{
+			return 0;
+		}
+		fd = copy(path);
+		if (fd < 0)
+		{
+			return -errno;
+		}
+	}
+	fd = openat(fd, path, O_WRONLY);
+	if (fd < 0)
+	{
+		return -errno;
+	}
+	if (ftruncate(fd, size) < 0)
+	{
+		close(fd);
+		return -errno;
+	}
+	close(fd);
+	return 0;
+}
+
+/**
+ * FUSE utimens method
+ */
+static int cowfs_utimens(const char *path, const struct timespec ts[2])
+{
+	struct timeval tv[2];
+	int fd;
+	private_cowfs_t *this = get_this();
+
+	rel(&path);
+	fd = get_rd(path);
+	if (fd == this->master_fd)
+	{
+		fd = copy(path);
+		if (fd < 0)
+		{
+			return -errno;
+		}
+	}
+
+	tv[0].tv_sec = ts[0].tv_sec;
+	tv[0].tv_usec = ts[0].tv_nsec / 1000;
+	tv[1].tv_sec = ts[1].tv_sec;
+	tv[1].tv_usec = ts[1].tv_nsec / 1000;
+
+	if (futimesat(fd, path, tv) < 0)
+	{
+		return -errno;
+	}
+	return 0;
+}
+
+/**
+ * FUSE open method
+ */
+static int cowfs_open(const char *path, struct fuse_file_info *fi)
+{
+	int fd;
+
+	rel(&path);
+	fd = get_rd(path);
+
+	fd = openat(fd, path, fi->flags);
+	if (fd < 0)
+	{
+		return -errno;
+	}
+	close(fd);
+	return 0;
+}
+
+/**
+ * FUSE read method
+ */
+static int cowfs_read(const char *path, char *buf, size_t size, off_t offset,
+					  struct fuse_file_info *fi)
+{
+	int file, fd, res;
+
+	rel(&path);
+
+	fd = get_rd(path);
+
+	file = openat(fd, path, O_RDONLY);
+	if (file < 0)
+	{
+		return -errno;
+	}
+	
+	res = pread(file, buf, size, offset);
+	if (res < 0)
+	{
+		res = -errno;
+	}
+	close(file);
+	return res;
+}
+
+/**
+ * FUSE write method
+ */
+static int cowfs_write(const char *path, const char *buf, size_t size,
+					   off_t offset, struct fuse_file_info *fi)
+{
+	private_cowfs_t *this = get_this();
+	int file, fd, res;
+
+	rel(&path);
+
+	fd = get_rd(path);
+	if (fd == this->master_fd)
+	{
+		fd = copy(path);
+		if (fd < 0)
+		{
+			return -errno;
+		}
+	}
+	file = openat(fd, path, O_WRONLY);
+	if (file < 0)
+	{
+		return -errno;
+	}
+	res = pwrite(file, buf, size, offset);
+	if (res < 0)
+	{
+		res = -errno;
+	}
+	close(file);
+	return res;
+}
+
+/**
+ * FUSE statfs method
+ */
+static int cowfs_statfs(const char *path, struct statvfs *stbuf)
+{
+	private_cowfs_t *this = get_this();
+	int fd;
+	
+	fd = this->host_fd;
+	if (this->over_fd > 0)
+	{
+		fd = this->over_fd;
+	}
+
+	if (fstatvfs(fd, stbuf) < 0)
+	{
+		return -errno;
+	}
+	
+    return 0;
+}
+
+/** 
+ * FUSE init method
+ */
+static void *cowfs_init(struct fuse_conn_info *conn)
+{
+	struct fuse_context *ctx;
+	
+	ctx = fuse_get_context();
+	
+	return ctx->private_data;
+}
+
+/**
+ * FUSE method vectors
+ */
+static struct fuse_operations cowfs_operations = {
+    .getattr	= cowfs_getattr,
+    .access		= cowfs_access,
+    .readlink	= cowfs_readlink,
+    .readdir	= cowfs_readdir,
+    .mknod		= cowfs_mknod,
+    .mkdir		= cowfs_mkdir,
+    .symlink	= cowfs_symlink,
+    .unlink		= cowfs_unlink,
+    .rmdir		= cowfs_rmdir,
+    .rename		= cowfs_rename,
+    .link		= cowfs_link,
+    .chmod		= cowfs_chmod,
+    .chown		= cowfs_chown,
+    .truncate	= cowfs_truncate,
+    .utimens	= cowfs_utimens,
+    .open		= cowfs_open,
+    .read		= cowfs_read,
+    .write		= cowfs_write,
+    .statfs		= cowfs_statfs,
+    .init		= cowfs_init,
+};
+
+/**
+ * Implementation of cowfs_t.set_overlay.
+ */
+static bool set_overlay(private_cowfs_t *this, char *path)
+{
+	if (this->over)
+	{
+		free(this->over);
+		this->over = NULL;
+	}
+	if (this->over_fd > 0)
+	{
+		close(this->over_fd);
+		this->over_fd = -1;
+	}
+	if (path)
+	{
+		this->over_fd = open(path, O_RDONLY | O_DIRECTORY);
+		if (this->over_fd < 0)
+		{
+			DBG1("failed to open overlay directory '%s': %m", path);
+			return FALSE;
+		}
+		this->over = strdup(path);
+	}
+	return TRUE;
+}
+
+/**
+ * stop, umount and destroy a cowfs FUSE filesystem
+ */
+static void destroy(private_cowfs_t *this)
+{
+	fuse_exit(this->fuse);
+	fuse_unmount(this->mount, this->chan);
+	pthread_join(this->thread, NULL);
+	fuse_destroy(this->fuse);
+	free(this->mount);
+	free(this->master);
+	free(this->host);
+	free(this->over);
+	close(this->master_fd);
+	close(this->host_fd);
+	if (this->over_fd > 0)
+	{
+		close(this->over_fd);
+	}
+	free(this);
+}
+
+/**
+ * creates a new cowfs fuse instance
+ */
+cowfs_t *cowfs_create(char *master, char *host, char *mount)
+{
+	struct fuse_args args = {0, NULL, 0};
+	private_cowfs_t *this = malloc_thing(private_cowfs_t);
+	
+	this->public.set_overlay = (bool(*)(cowfs_t*, char *path))set_overlay;
+	this->public.destroy = (void(*)(cowfs_t*))destroy;
+	
+    this->master_fd = open(master, O_RDONLY | O_DIRECTORY);
+    if (this->master_fd < 0)
+    {
+    	DBG1("failed to open master filesystem '%s'", master);
+    	free(this);
+    }
+    this->host_fd = open(host, O_RDONLY | O_DIRECTORY);
+	if (this->master_fd < 0)
+    {
+    	DBG1("failed to open host filesystem '%s'", host);
+    	close(this->master_fd);
+    	free(this);
+    }
+	this->over_fd = -1;
+	
+    this->chan = fuse_mount(mount, &args);
+    if (this->chan == NULL)
+    {
+    	DBG1("mounting cowfs FUSE on '%s' failed", mount);
+    	close(this->master_fd);
+    	close(this->host_fd);
+    	free(this);
+    	return NULL;
+    }
+    
+    this->fuse = fuse_new(this->chan, &args, &cowfs_operations,
+    					  sizeof(cowfs_operations), this);
+    if (this->fuse == NULL)
+    {
+    	DBG1("creating cowfs FUSE handle failed");
+    	close(this->master_fd);
+    	close(this->host_fd);
+    	fuse_unmount(mount, this->chan);
+    	free(this);
+    	return NULL;
+    }
+    
+    this->mount = strdup(mount);
+    this->master = strdup(master);
+    this->host = strdup(host);
+    this->over = NULL;
+	
+	if (pthread_create(&this->thread, NULL, (void*)fuse_loop, this->fuse) != 0)
+	{
+    	DBG1("creating thread to handle FUSE failed");
+    	fuse_unmount(mount, this->chan);
+    	free(this->mount);
+    	free(this->master);
+    	free(this->host);
+    	close(this->master_fd);
+    	close(this->host_fd);
+    	free(this);
+    	return NULL;
+	}
+    
+    return &this->public;
+}
+
diff --git a/src/dumm/cowfs.h b/src/dumm/cowfs.h
new file mode 100644
index 000000000..419197dd6
--- /dev/null
+++ b/src/dumm/cowfs.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2007 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.
+ */
+
+#ifndef COWFS_H
+#define COWFS_H
+
+#include <library.h>
+
+typedef struct cowfs_t cowfs_t;
+
+/**
+ * @brief cowfs - Copy on write FUSE filesystem.
+ *
+ */
+struct cowfs_t {
+	
+	/**
+	 * @brief Set an additional copy on write overlay.
+	 *
+	 * @param path		path of the overlay
+	 * @return 			FALSE if failed
+	 */
+	bool (*set_overlay)(cowfs_t *this, char *path);
+	
+	/**
+	 * @brief Stop, umount and destroy a cowfs FUSE filesystem.
+	 */
+	void (*destroy) (cowfs_t *this);
+};
+
+/**
+ * @brief Mount a cowfs FUSE filesystem.
+ *
+ * @param master		read only master file system directory
+ * @param host			copy on write host directory
+ * @param mount			mountpoint where union is mounted
+ * @return				instance, or NULL if FUSE initalization failed
+ */
+cowfs_t *cowfs_create(char *master, char *host, char *mount);
+
+#endif /* COWFS_H */
+
diff --git a/src/dumm/dumm.c b/src/dumm/dumm.c
new file mode 100644
index 000000000..b9a2814e6
--- /dev/null
+++ b/src/dumm/dumm.c
@@ -0,0 +1,391 @@
+/*
+ * Copyright (C) 2007 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.
+ */
+
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <dirent.h>
+#include <errno.h>
+
+#include <debug.h>
+
+#include "dumm.h"
+
+#define PERME (S_IRWXU | S_IRWXG)
+#define GUEST_DIR "guests"
+#define TEMPLATE_DIR "templates"
+#define TEMPLATE_DIR_DIR "diff"
+
+/**
+ * instances of dumm, used to deliver signals
+ */
+static linked_list_t *instances = NULL;
+
+typedef struct private_dumm_t private_dumm_t;
+
+struct private_dumm_t {
+	/** public dumm interface */
+	dumm_t public;
+	/** working dir */
+	char *dir;
+	/** directory of guests */
+	char *guest_dir;
+	/** directory of templates */
+	char *template_dir;
+	/** directory of loaded template */
+	char *template;
+	/** list of managed guests */
+	linked_list_t *guests;
+	/** list of managed bridges */
+	linked_list_t *bridges;
+	/** do not catch signals if we are destroying */
+	bool destroying;
+};
+
+/**
+ * Implementation of dumm_t.create_guest.
+ */
+static guest_t* create_guest(private_dumm_t *this, char *name, char *kernel, 
+							 char *master, int mem)
+{
+	guest_t *guest;
+	
+	guest = guest_create(this->guest_dir, name, kernel, master, mem);
+	if (guest)
+	{
+		this->guests->insert_last(this->guests, guest);
+	}
+	return guest;
+}
+
+/**
+ * Implementation of dumm_t.create_guest_iterator.
+ */
+static iterator_t* create_guest_iterator(private_dumm_t *this)
+{
+	return this->guests->create_iterator(this->guests, TRUE);
+}
+
+/**
+ * Implementation of dumm_t.create_bridge.
+ */
+static bridge_t* create_bridge(private_dumm_t *this, char *name)
+{
+	bridge_t *bridge;
+	
+	bridge = bridge_create(name);
+	if (bridge)
+	{
+		this->bridges->insert_last(this->bridges, bridge);
+	}
+	return bridge;
+}
+
+/**
+ * Implementation of dumm_t.create_bridge_iterator.
+ */
+static iterator_t* create_bridge_iterator(private_dumm_t *this)
+{
+	return this->bridges->create_iterator(this->bridges, TRUE);
+}
+
+/**
+ * disable the currently enabled template 
+ */
+static void clear_template(private_dumm_t *this)
+{
+	iterator_t *iterator, *ifaces;
+	guest_t *guest;
+	iface_t *iface;
+
+	free(this->template);
+	this->template = NULL;
+
+	iterator = this->guests->create_iterator(this->guests, TRUE);
+	while (iterator->iterate(iterator, (void**)&guest))
+	{
+		guest->load_template(guest, NULL);
+		ifaces = guest->create_iface_iterator(guest);
+		while (ifaces->iterate(ifaces, (void**)&iface))
+		{
+			ifaces->remove(ifaces);
+			iface->destroy(iface);
+		}
+		ifaces->destroy(ifaces);
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * Implementation of dumm_t.load_template.
+ */
+static bool load_template(private_dumm_t *this, char *name)
+{
+	iterator_t *iterator;
+	guest_t *guest;
+	char dir[PATH_MAX];
+	size_t len;
+	
+	clear_template(this);
+	
+	if (name == NULL)
+	{
+		return TRUE;
+	}
+
+	free(this->template);
+	asprintf(&this->template, "%s/%s", this->template_dir, name);
+	len = snprintf(dir, sizeof(dir), "%s/%s", this->template, TEMPLATE_DIR_DIR);
+	if (len < 0 || len >= sizeof(dir))
+	{
+		return FALSE;
+	}
+	
+	if (access(this->template, F_OK) != 0)
+	{	/* does not exist, create template */
+		if (mkdir(this->template, PERME) != 0)
+		{
+			DBG1("creating template directory '%s' failed: %m", this->template);
+			return FALSE;
+		}
+		if (mkdir(dir, PERME) != 0)
+		{
+			DBG1("creating template overlay directory '%s' failed: %m", dir);
+			return FALSE;
+		}
+	}
+	iterator = this->guests->create_iterator(this->guests, TRUE);
+	while (iterator->iterate(iterator, (void**)&guest))
+	{
+		if (!guest->load_template(guest, dir))
+		{
+			iterator->destroy(iterator);
+			clear_template(this);
+			return FALSE;
+		}
+	}
+	iterator->destroy(iterator);
+	return TRUE;
+}
+
+/**
+ * signal handler 
+ */
+void signal_handler(int sig, siginfo_t *info, void *ucontext)
+{
+	if (sig == SIGCHLD)
+	{
+		switch (info->si_code)
+		{
+			case CLD_EXITED:
+			case CLD_KILLED:
+			case CLD_DUMPED:
+			{
+				private_dumm_t *this;
+				guest_t *guest;
+				iterator_t *iterator, *guests;
+				
+				iterator = instances->create_iterator(instances, TRUE);
+				while (iterator->iterate(iterator, (void**)&this))
+				{
+					if (this->destroying)
+					{
+						continue;
+					}
+					guests = this->guests->create_iterator(this->guests, TRUE);
+					while (guests->iterate(guests, (void**)&guest))
+					{
+						if (guest->get_pid(guest) == info->si_pid)
+						{
+							guest->sigchild(guest);
+							break;
+						}
+					}
+					guests->destroy(guests);
+				}
+				iterator->destroy(iterator);
+				break;
+			}
+			default:
+				break;
+		}
+
+	}
+	/* SIGHUP is currently just ignored */
+}
+
+/**
+ * add a dumm instance
+ */
+static void add_instance(private_dumm_t *this)
+{
+	if (instances == NULL)
+	{
+		struct sigaction action;
+		
+		instances = linked_list_create();
+		
+		memset(&action, 0, sizeof(action));
+		action.sa_sigaction = signal_handler;
+		action.sa_flags = SA_SIGINFO;
+		
+		if (sigaction(SIGCHLD, &action, NULL) != 0 ||
+			sigaction(SIGHUP, &action, NULL) != 0)
+		{
+			DBG1("installing signal handler failed!");
+		}
+	}
+	instances->insert_last(instances, this);
+}
+
+/**
+ * remove a dumm instance
+ */
+static void remove_instance(private_dumm_t *this)
+{
+	iterator_t *iterator;
+	private_dumm_t *current;
+	
+	iterator = instances->create_iterator(instances, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		if (current == this)
+		{
+			iterator->remove(iterator);
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+	if (instances->get_count(instances) == 0)
+	{
+		instances->destroy(instances);
+		instances = NULL;
+	}
+}
+
+/**
+ * Implementation of dumm_t.destroy
+ */
+static void destroy(private_dumm_t *this)
+{
+	iterator_t *iterator;
+	guest_t *guest;
+
+	this->bridges->destroy_offset(this->bridges, offsetof(bridge_t, destroy));
+	
+	iterator = this->guests->create_iterator(this->guests, TRUE);
+	while (iterator->iterate(iterator, (void**)&guest))
+	{
+		guest->stop(guest);
+	}
+	iterator->destroy(iterator);
+	
+	this->destroying = TRUE;
+	this->guests->destroy_offset(this->guests, offsetof(guest_t, destroy));
+	free(this->guest_dir);
+	free(this->template_dir);
+	free(this->template);
+	free(this->dir);
+	remove_instance(this);
+	free(this);
+}
+
+/**
+ * load all guests in our working dir
+ */
+static void load_guests(private_dumm_t *this)
+{
+	DIR *dir;
+	struct dirent *ent;
+	guest_t *guest;
+	
+	dir = opendir(this->guest_dir);
+	if (dir == NULL)
+	{
+		return;
+	}
+	
+	while ((ent = readdir(dir)))
+	{
+		if (streq(ent->d_name, ".") ||  streq(ent->d_name, ".."))
+		{
+			continue;
+		}
+		guest = guest_load(this->guest_dir, ent->d_name);
+		if (guest)
+		{
+			DBG1("loaded guest '%s'", ent->d_name);
+			this->guests->insert_last(this->guests, guest);
+		}
+		else
+		{
+			DBG1("loading guest in directory '%s' failed, skipped", ent->d_name);
+		}
+	}
+	closedir(dir);
+}
+
+/**
+ * create a dumm instance
+ */
+dumm_t *dumm_create(char *dir)
+{
+	char cwd[PATH_MAX];
+	private_dumm_t *this = malloc_thing(private_dumm_t);
+	
+	this->public.create_guest = (guest_t*(*)(dumm_t*,char*,char*,char*,int))create_guest;
+	this->public.create_guest_iterator = (iterator_t*(*)(dumm_t*))create_guest_iterator;
+	this->public.create_bridge = (bridge_t*(*)(dumm_t*, char *name))create_bridge;
+	this->public.create_bridge_iterator = (iterator_t*(*)(dumm_t*))create_bridge_iterator;
+	this->public.load_template = (bool(*)(dumm_t*, char *name))load_template;
+	this->public.destroy = (void(*)(dumm_t*))destroy;
+	
+	this->destroying = FALSE;
+	if (*dir == '/' || getcwd(cwd, sizeof(cwd)) == 0)
+	{
+		this->dir = strdup(dir);
+	}
+	else
+	{
+		asprintf(&this->dir, "%s/%s", cwd, dir);
+	}
+	this->template = NULL;
+	asprintf(&this->guest_dir, "%s/%s", this->dir, GUEST_DIR);
+	asprintf(&this->template_dir, "%s/%s", this->dir, TEMPLATE_DIR);
+	this->guests = linked_list_create();
+	this->bridges = linked_list_create();
+	
+	add_instance(this);
+	
+	if (mkdir(this->guest_dir, PERME) < 0 && errno != EEXIST)
+	{
+		DBG1("creating guest directory '%s' failed: %m", this->guest_dir);
+		destroy(this);
+		return NULL;
+	}
+	if (mkdir(this->template_dir, PERME) < 0 && errno != EEXIST)
+	{
+		DBG1("creating template directory '%s' failed: %m", this->template_dir);
+		destroy(this);
+		return NULL;
+	}
+	
+	load_guests(this);
+	return &this->public;
+}
+
diff --git a/src/dumm/dumm.h b/src/dumm/dumm.h
new file mode 100644
index 000000000..5414f9993
--- /dev/null
+++ b/src/dumm/dumm.h
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2007 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.
+ */
+
+#ifndef DUMM_H
+#define DUMM_H
+
+#include <signal.h>
+
+#include <library.h>
+#include <utils/linked_list.h>
+
+#include "guest.h"
+#include "bridge.h"
+
+typedef struct dumm_t dumm_t;
+
+/**
+ * @brief dumm - Dynamic Uml Mesh Modeler
+ *
+ * Controls a group of UML guests and their networks.
+ * Dumm catches SIGCHD and SIGHUP to trace UML child processes and the FUSE
+ * filesystem. Do not overwrite these signal handlers!
+ */
+struct dumm_t {
+
+	/**
+	 * @brief Starts a new UML guest
+	 *
+	 * @param name		name of the guest
+	 * @param kernel	UML kernel to use for guest
+	 * @param master	mounted read only master filesystem
+	 * @param mem		amount of memory for guest, in MB
+	 * @return			guest if started, NULL if failed
+	 */
+	guest_t* (*create_guest) (dumm_t *this, char *name, char *kernel, 
+							  char *master, int mem);
+	
+	/**
+	 * @brief Create an iterator over all guests.
+	 *
+	 * @return			iteraotor over guest_t's
+	 */
+	iterator_t* (*create_guest_iterator) (dumm_t *this);
+	
+	/**
+	 * @brief Create a new bridge.
+	 *
+	 * @param name		name of the bridge to create
+	 * @return			created bridge
+	 */
+	bridge_t* (*create_bridge)(dumm_t *this, char *name);
+	
+	/**
+	 * @brief Create an iterator over all bridges.
+	 *
+	 * @return			iterator over bridge_t's
+	 */
+	iterator_t* (*create_bridge_iterator)(dumm_t *this);
+	
+	/**
+	 * @brief Loads a template, create a new one if it does not exist.
+	 *
+	 * @param name		name of the template, NULL to close
+	 * @return			FALSE if load/create failed
+	 */
+	bool (*load_template)(dumm_t *this, char *name);
+	
+	/**
+	 * @brief stop all guests and destroy the modeler
+	 */
+	void (*destroy) (dumm_t *this);
+};
+
+/**
+ * @brief Create a group of UML hosts and networks.
+ *
+ * @param dir			directory to create guests/load from
+ * @return				created UML group, or NULL if failed.
+ */
+dumm_t *dumm_create(char *dir);
+
+#endif /* DUMM_H */
+
diff --git a/src/dumm/guest.c b/src/dumm/guest.c
new file mode 100644
index 000000000..bbb59f431
--- /dev/null
+++ b/src/dumm/guest.c
@@ -0,0 +1,567 @@
+/*
+ * Copyright (C) 2007 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.
+ */
+
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/uio.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <dirent.h>
+#include <termios.h>
+
+#include <debug.h>
+#include <utils/linked_list.h>
+
+#include "dumm.h"
+#include "guest.h"
+#include "mconsole.h"
+#include "cowfs.h"
+
+#define PERME (S_IRWXU | S_IRWXG)
+#define PERM (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP)
+
+#define MASTER_DIR "master"
+#define DIFF_DIR "diff"
+#define UNION_DIR "union"
+#define MEMORY_FILE "mem"
+#define KERNEL_FILE "linux"
+#define LOG_FILE "boot.log"
+#define NOTIFY_FILE "notify"
+#define PTYS 0
+
+typedef struct private_guest_t private_guest_t;
+
+struct private_guest_t {
+	/** implemented public interface */
+	guest_t public;
+	/** name of the guest */
+	char *name;
+	/** directory of guest */
+	int dir;
+	/** directory name of guest */
+	char *dirname;
+	/** amount of memory for guest, in MB */
+	int mem;
+	/** pid of guest child process */
+	int pid;
+	/** state of guest */
+	guest_state_t state;
+	/** log file for console 0 */
+	int bootlog;
+	/** FUSE cowfs instance */
+	cowfs_t *cowfs;
+	/** mconsole to control running UML */
+	mconsole_t *mconsole;
+	/** list of interfaces attached to the guest */
+	linked_list_t *ifaces;
+};
+
+ENUM(guest_state_names, GUEST_STOPPED, GUEST_STOPPING,
+	"STOPPED",
+	"STARTING",
+	"RUNNING",
+	"PAUSED",
+	"STOPPING",
+);
+
+/**
+ * Implementation of guest_t.get_name.
+ */
+static char* get_name(private_guest_t *this)
+{
+	return this->name;
+}
+
+/**
+ * Implementation of guest_t.create_iface.
+ */
+static iface_t* create_iface(private_guest_t *this, char *name)
+{
+	iterator_t *iterator;
+	iface_t *iface;
+	
+	if (this->state != GUEST_RUNNING)
+	{
+		DBG1("guest '%s' not running, unable to add interface", this->name);
+		return NULL;
+	}
+	
+	iterator = this->ifaces->create_iterator(this->ifaces, TRUE);
+	while (iterator->iterate(iterator, (void**)&iface))
+	{
+		if (streq(name, iface->get_guestif(iface)))
+		{
+			DBG1("guest '%s' already has an interface '%s'", this->name, name);
+			iterator->destroy(iterator);
+			return NULL;
+		}
+	}
+	iterator->destroy(iterator);
+
+	iface = iface_create(this->name, name, this->mconsole);
+	if (iface)
+	{
+		this->ifaces->insert_last(this->ifaces, iface);
+	}
+	return iface;
+}
+
+/**
+ * Implementation of guest_t.create_iface_iterator.
+ */
+static iterator_t* create_iface_iterator(private_guest_t *this)
+{
+	return this->ifaces->create_iterator(this->ifaces, TRUE);
+}
+	
+/**
+ * Implementation of guest_t.get_state.
+ */
+static guest_state_t get_state(private_guest_t *this)
+{
+	return this->state;
+}
+
+/**
+ * Implementation of guest_t.get_pid.
+ */
+static pid_t get_pid(private_guest_t *this)
+{
+	return this->pid;
+}
+
+/**
+ * write format string to a buffer, and advance buffer position
+ */
+static char* write_arg(char **pos, size_t *left, char *format, ...)
+{
+	size_t len;
+	char *res = NULL;
+	va_list args;
+
+	va_start(args, format);
+	len = vsnprintf(*pos, *left, format, args);
+	va_end(args);
+	if (len < *left)
+	{
+		res = *pos;
+		len++;
+		*pos += len + 1;
+		*left -= len + 1;
+	}
+	return res;
+}
+
+/**
+ * Implementation of get_t.close_console.
+ */
+static char* get_console(private_guest_t *this, int console)
+{
+	if (this->state == GUEST_RUNNING)
+	{
+		return this->mconsole->get_console_pts(this->mconsole, console);
+	}
+	return NULL;
+}
+
+/**
+ * Implementation of guest_t.stop.
+ */
+static void stop(private_guest_t *this)
+{
+	if (this->state != GUEST_STOPPED)
+	{
+		this->state = GUEST_STOPPING;
+		this->ifaces->destroy_offset(this->ifaces, offsetof(iface_t, destroy));
+		this->ifaces = linked_list_create();
+		kill(this->pid, SIGINT);
+		waitpid(this->pid, NULL, 0);
+		this->state = GUEST_STOPPED;
+	}
+}
+
+/**
+ * Implementation of guest_t.start.
+ */
+static bool start(private_guest_t *this)
+{
+	char buf[2048];
+	char *notify;
+	char *pos = buf;
+	char *args[16];
+	int i = 0;
+	size_t left = sizeof(buf);
+	
+	if (this->state != GUEST_STOPPED)
+	{
+		DBG1("unable to start guest in state %N", guest_state_names, this->state);
+		return FALSE;
+	}
+	this->state = GUEST_STARTING;
+	
+	notify = write_arg(&pos, &left, "%s/%s", this->dirname, NOTIFY_FILE);
+	
+	args[i++] = write_arg(&pos, &left, "%s/%s", this->dirname, KERNEL_FILE);
+	args[i++] = write_arg(&pos, &left, "root=/dev/root");
+	args[i++] = write_arg(&pos, &left, "rootfstype=hostfs");
+	args[i++] = write_arg(&pos, &left, "rootflags=%s/%s", this->dirname, UNION_DIR);
+	args[i++] = write_arg(&pos, &left, "uml_dir=%s", this->dirname);
+	args[i++] = write_arg(&pos, &left, "umid=%s", this->name);
+	args[i++] = write_arg(&pos, &left, "mem=%dM", this->mem);
+	args[i++] = write_arg(&pos, &left, "mconsole=notify:%s", notify);
+	args[i++] = write_arg(&pos, &left, "con=pts");
+	args[i++] = write_arg(&pos, &left, "con0=none,fd:%d", this->bootlog);
+	args[i++] = NULL;
+	  
+	this->pid = fork();
+	switch (this->pid)
+	{
+		case 0: /* child,  */
+			dup2(open("/dev/null", 0), 0);
+			dup2(this->bootlog, 1);
+			dup2(this->bootlog, 2);
+			execvp(args[0], args);
+			DBG1("starting UML kernel '%s' failed: %m", args[0]);
+			exit(1);
+		case -1:
+			this->state = GUEST_STOPPED;
+			return FALSE;
+		default:
+			break;
+	}
+	/* open mconsole */
+	this->mconsole = mconsole_create(notify);
+	if (this->mconsole == NULL)
+	{
+		DBG1("opening mconsole at '%s' failed, stopping guest", buf);
+		stop(this);
+		return FALSE;
+	}
+	
+	this->state = GUEST_RUNNING;
+	return TRUE;
+}	
+	
+/**
+ * Implementation of guest_t.load_template.
+ */
+static bool load_template(private_guest_t *this, char *path)
+{
+	char dir[PATH_MAX];
+	size_t len;
+	
+	if (path == NULL)
+	{
+		return this->cowfs->set_overlay(this->cowfs, NULL);	
+	}
+	
+	len = snprintf(dir, sizeof(dir), "%s/%s", path, this->name);
+	if (len < 0 || len >= sizeof(dir))
+	{
+		return FALSE;
+	}
+	if (access(dir, F_OK) != 0)
+	{
+		if (mkdir(dir, PERME) != 0)
+		{
+			DBG1("creating overlay for guest '%s' failed: %m", this->name);
+			return FALSE;
+		}
+	}
+	return this->cowfs->set_overlay(this->cowfs, dir);
+}
+
+/**
+ * Implementation of guest_t.sigchild.
+ */
+static void sigchild(private_guest_t *this)
+{
+	if (this->state != GUEST_STOPPING)
+	{	/* collect zombie if uml crashed */
+		waitpid(this->pid, NULL, WNOHANG);
+	}
+	DESTROY_IF(this->mconsole);
+	this->mconsole = NULL;
+	this->state = GUEST_STOPPED;
+}
+
+/**
+ * umount the union filesystem
+ */
+static bool umount_unionfs(private_guest_t *this)
+{
+	if (this->cowfs)
+	{
+		this->cowfs->destroy(this->cowfs);
+		this->cowfs = NULL;
+		return TRUE;
+	}
+	return FALSE;
+}
+
+/**
+ * mount the union filesystem
+ */
+static bool mount_unionfs(private_guest_t *this)
+{
+	char master[PATH_MAX];
+	char diff[PATH_MAX];
+	char mount[PATH_MAX];
+
+	if (this->cowfs == NULL)
+	{
+		snprintf(master, sizeof(master), "%s/%s", this->dirname, MASTER_DIR);
+		snprintf(diff, sizeof(diff), "%s/%s", this->dirname, DIFF_DIR);
+		snprintf(mount, sizeof(mount), "%s/%s", this->dirname, UNION_DIR);
+		
+		this->cowfs = cowfs_create(master, diff, mount);
+		if (this->cowfs)
+		{
+			return TRUE;
+		}
+	}
+	return FALSE;
+}
+
+/**
+ * open logfile for boot messages
+ */
+static int open_bootlog(private_guest_t *this)
+{
+	int fd;
+	
+	fd = openat(this->dir, LOG_FILE, O_WRONLY | O_CREAT, PERM);
+	if (fd == -1)
+	{
+		DBG1("opening bootlog failed, using stdout");
+		return 1;
+	}
+	return fd;
+}
+
+/**
+ * load memory configuration from file
+ */
+int loadmem(private_guest_t *this)
+{
+	FILE *file;
+	int mem = 0;
+	
+	file = fdopen(openat(this->dir, MEMORY_FILE, O_RDONLY, PERM), "r");
+	if (file)
+	{
+		if (fscanf(file, "%d", &mem) <= 0)
+		{
+			mem = 0;
+		}
+		fclose(file);
+	}
+	return mem;
+}
+
+/**
+ * save memory configuration to file
+ */
+bool savemem(private_guest_t *this, int mem)
+{
+	FILE *file;
+	bool retval = FALSE;
+	
+	file = fdopen(openat(this->dir, MEMORY_FILE, O_RDWR | O_CREAT | O_TRUNC,
+						 PERM), "w");
+	if (file)
+	{
+		if (fprintf(file, "%d", mem) > 0)
+		{
+			retval = TRUE;
+		}
+		fclose(file);
+	}
+	return retval;
+}
+
+/**
+ * Implementation of guest_t.destroy.
+ */
+static void destroy(private_guest_t *this)
+{
+	stop(this);
+	umount_unionfs(this);
+	if (this->bootlog > 1)
+	{
+		close(this->bootlog);
+	}
+	if (this->dir > 0)
+	{
+		close(this->dir);
+	}
+	free(this->dirname);
+	free(this->name);
+	free(this);
+}
+
+/**
+ * generic guest constructor
+ */
+static private_guest_t *guest_create_generic(char *parent, char *name,
+											 bool create)
+{
+	char cwd[PATH_MAX];
+	private_guest_t *this = malloc_thing(private_guest_t);
+	
+	this->public.get_name = (void*)get_name;
+	this->public.get_pid = (pid_t(*)(guest_t*))get_pid;
+	this->public.get_state = (guest_state_t(*)(guest_t*))get_state;
+	this->public.create_iface = (iface_t*(*)(guest_t*,char*))create_iface;
+	this->public.create_iface_iterator = (iterator_t*(*)(guest_t*))create_iface_iterator;
+	this->public.start = (void*)start;
+	this->public.stop = (void*)stop;
+	this->public.get_console = (char*(*)(guest_t*,int))get_console;
+	this->public.load_template = (bool(*)(guest_t*, char *path))load_template;
+	this->public.sigchild = (void(*)(guest_t*))sigchild;
+	this->public.destroy = (void*)destroy;
+		
+	if (*parent == '/' || getcwd(cwd, sizeof(cwd)) == NULL)
+	{
+		asprintf(&this->dirname, "%s/%s", parent, name);
+	}
+	else
+	{
+		asprintf(&this->dirname, "%s/%s/%s", cwd, parent, name);
+	}
+	if (create)
+	{
+		mkdir(this->dirname, PERME);
+	}
+	this->dir = open(this->dirname, O_DIRECTORY, PERME);
+	if (this->dir < 0)
+	{
+		DBG1("opening guest directory '%s' failed: %m", this->dirname);
+		free(this->dirname);
+		free(this);
+		return NULL;
+	}
+	
+	this->pid = 0;
+	this->state = GUEST_STOPPED;
+	this->mconsole = NULL;
+	this->ifaces = linked_list_create();
+	this->mem = 0;
+	this->bootlog = open_bootlog(this);
+	this->name = strdup(name);
+	this->cowfs = NULL;
+	
+	return this;
+}
+
+/**
+ * create a symlink to old called new in our working dir
+ */
+static bool make_symlink(private_guest_t *this, char *old, char *new)
+{
+	char cwd[PATH_MAX];
+	char buf[PATH_MAX];
+	
+	if (*old == '/' || getcwd(cwd, sizeof(cwd)) == NULL)
+	{
+		snprintf(buf, sizeof(buf), "%s", old);
+	}
+	else
+	{
+		snprintf(buf, sizeof(buf), "%s/%s", cwd, old);
+	}
+	return symlinkat(buf, this->dir, new) == 0;
+}
+
+
+/**
+ * create the guest instance, including required dirs and mounts 
+ */
+guest_t *guest_create(char *parent, char *name, char *kernel,
+					  char *master, int mem)
+{
+	private_guest_t *this = guest_create_generic(parent, name, TRUE);
+	
+	if (this == NULL)
+	{
+		return NULL;
+	}
+	
+	if (!make_symlink(this, master, MASTER_DIR) ||
+		!make_symlink(this, kernel, KERNEL_FILE))
+	{
+		DBG1("creating master/kernel symlink failed: %m");
+		destroy(this);
+		return NULL;
+	}
+	
+	if (mkdirat(this->dir, UNION_DIR, PERME) != 0 || 
+		mkdirat(this->dir, DIFF_DIR, PERME) != 0)
+	{
+		DBG1("unable to create directories for '%s': %m", name);
+		destroy(this);
+		return NULL;
+	}
+	
+	this->mem = mem;
+	if (!savemem(this, mem))
+	{
+		destroy(this);
+		return NULL;
+	}
+	
+	if (!mount_unionfs(this))
+	{
+		destroy(this);
+		return NULL;
+	}
+
+	return &this->public;
+}
+
+/**
+ * load an already created guest
+ */
+guest_t *guest_load(char *parent, char *name)
+{
+	private_guest_t *this = guest_create_generic(parent, name, FALSE);
+	
+	if (this == NULL)
+	{
+		return NULL;
+	}
+	
+	this->mem = loadmem(this);
+	if (this->mem == 0)
+	{
+		DBG1("unable to open memory configuration file: %m", name);
+		destroy(this);
+		return NULL;
+	}
+	
+	if (!mount_unionfs(this))
+	{
+		destroy(this);
+		return NULL;
+	}
+	
+	return &this->public;
+}
+
diff --git a/src/dumm/guest.h b/src/dumm/guest.h
new file mode 100644
index 000000000..10b37aaa7
--- /dev/null
+++ b/src/dumm/guest.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2007 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.
+ */
+
+#ifndef GUEST_H
+#define GUEST_H
+
+#include <library.h>
+#include <utils/iterator.h>
+
+#include "iface.h"
+
+typedef enum guest_state_t guest_state_t;
+
+/**
+ * @brief State of a guest (started, stopped, ...)
+ */
+enum guest_state_t {
+	/** guest kernel not running at all */
+	GUEST_STOPPED,
+	/** kernel started, but not yet available */
+	GUEST_STARTING,
+	/** guest is up and running */
+	GUEST_RUNNING,
+	/** guest has been paused */
+	GUEST_PAUSED,
+	/** guest is stopping (shutting down) */
+	GUEST_STOPPING,
+};
+
+/**
+ * string mappings for guest_state_t
+ */
+extern enum_name_t *guest_state_names;
+
+typedef struct guest_t guest_t;
+
+/**
+ * @brief A guest is a UML instance running on the host.
+ **/
+struct guest_t {
+	
+	/**
+	 * @brief Get the name of this guest.
+	 *
+	 * @return		name of the guest
+	 */
+	char* (*get_name) (guest_t *this);
+	
+	/**
+	 * @brief Get the process ID of the guest child process.
+	 *
+	 * @return		name of the guest
+	 */
+	pid_t (*get_pid) (guest_t *this);
+	
+	/**
+	 * @brief Get the state of the guest (stopped, started, etc.).
+	 *
+	 * @return		guests state
+	 */
+	guest_state_t (*get_state)(guest_t *this);	
+	
+	/**
+	 * @brief Start the guest.
+	 *
+	 * @return		TRUE if guest successfully started
+	 */
+	bool (*start) (guest_t *this);
+	
+	/**
+	 * @brief Kill the guest.
+	 *
+	 * @return		TRUE if guest was running and killed
+	 */
+	bool (*stop) (guest_t *this);
+	
+	/**
+	 * @brief Get a console pts device.
+	 *
+	 * Every guest has 5 consoles, numbered from 1 to 5. These are associated
+	 * to a unique pts device on the host. 
+	 *
+	 * @param console	console number to get (1-5)
+	 * @return			pts device file name, NULL if failed
+	 */
+	char* (*get_console) (guest_t *this, int console);
+	
+	/**
+	 * @brief Create a new interface in the current scenario.
+	 *
+	 * @param name	name of the interface in the guest
+	 * @return		created interface, or NULL if failed
+	 */
+	iface_t* (*create_iface)(guest_t *this, char *name);
+	
+	/**
+	 * @brief Create an iterator over all guest interfaces.
+	 *
+	 * @return		iterator over iface_t's
+	 */
+	iterator_t* (*create_iface_iterator)(guest_t *this);
+	
+	/**
+	 * @brief Set the template COWFS overlay to use.
+	 *
+	 * @param parent	parent directory where template diff should point to
+	 * @return			FALSE if failed
+	 */
+	bool (*load_template)(guest_t *this, char *parent);
+
+	/**
+	 * @brief Called whenever a SIGCHILD for the guests PID is received.
+	 */
+	void (*sigchild)(guest_t *this);
+	
+	/**
+	 * @brief Close and destroy a guest with all interfaces
+	 */	
+	void (*destroy) (guest_t *this);
+};
+
+/**
+ * @brief Create a new, unstarted guest.
+ *
+ * @param parent	parent directory to create the guest in
+ * @param name		name of the guest to create
+ * @param kernel	kernel this guest uses
+ * @param master	read-only master filesystem for guest
+ * @param mem		amount of memory to give the guest
+ */
+guest_t *guest_create(char *parent, char *name, char *kernel,
+					  char *master, int mem);
+
+/**
+ * @brief Load a guest created with guest_create().
+ *
+ * @param parent	parent directory to look for a guest
+ * @param name		name of the guest directory
+ */
+guest_t *guest_load(char *parent, char *name);
+
+#endif /* GUEST_H */
+
diff --git a/src/dumm/iface.c b/src/dumm/iface.c
new file mode 100644
index 000000000..3c1bfc470
--- /dev/null
+++ b/src/dumm/iface.c
@@ -0,0 +1,179 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ * Copyright (C) 2002 Jeff Dike
+ *
+ * Based on the "tunctl" utility from Jeff Dike.
+ *
+ * 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 <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <linux/if_tun.h>
+
+#include <debug.h>
+
+#include "iface.h"
+
+typedef struct private_iface_t private_iface_t;
+
+struct private_iface_t {
+	/** public interface */
+	iface_t public;
+	/** device name in guest (eth0) */
+	char *guestif;
+	/** device name at host (tap0) */
+	char *hostif;
+	/** bridge this interface is attached to */
+	bridge_t *bridge;
+	/** mconsole for guest */
+	mconsole_t *mconsole;
+};
+
+/**
+ * Implementation of iface_t.get_guestif.
+ */
+static char* get_guestif(private_iface_t *this)
+{
+	return this->guestif;
+}
+
+/**
+ * Implementation of iface_t.get_hostif.
+ */
+static char* get_hostif(private_iface_t *this)
+{
+	return this->hostif;
+}
+
+/**
+ * Implementation of iface_t.set_bridge.
+ */
+static void set_bridge(private_iface_t *this, bridge_t *bridge)
+{
+	this->bridge = bridge;
+}
+
+/**
+ * destroy the tap device
+ */
+static bool destroy_tap(private_iface_t *this)
+{
+	struct ifreq ifr;
+	int tap;
+
+	memset(&ifr, 0, sizeof(ifr));
+	ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+	strncpy(ifr.ifr_name, this->hostif, sizeof(ifr.ifr_name) - 1);
+	
+	tap = open(TAP_DEVICE, O_RDWR);
+	if (tap < 0)
+	{
+		DBG1("unable to open tap device %s: %m", TAP_DEVICE);
+		return FALSE;
+	}
+	if (ioctl(tap, TUNSETIFF, &ifr) < 0 ||
+		ioctl(tap, TUNSETPERSIST, 0) < 0)
+	{
+		DBG1("removing %s failed: %m", this->hostif);
+		close(tap);
+		return FALSE;
+	}
+	close(tap);
+	return TRUE;
+}
+
+/**
+ * create the tap device
+ */
+static char* create_tap(private_iface_t *this, char *guest)
+{
+	struct ifreq ifr;
+	int tap;
+
+	memset(&ifr, 0, sizeof(ifr));
+	ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+	snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s-%s", guest, this->guestif);
+
+	tap = open(TAP_DEVICE, O_RDWR);
+	if (tap < 0)
+	{
+		DBG1("unable to open tap device %s: %m", TAP_DEVICE);
+		return NULL;
+	}
+	if (ioctl(tap, TUNSETIFF, &ifr) < 0 ||
+		ioctl(tap, TUNSETPERSIST, 1) < 0 ||
+		ioctl(tap, TUNSETOWNER, 0))
+    {
+		DBG1("creating new tap device failed: %m");
+		close(tap);
+		return NULL;
+    } 
+	close(tap);
+	return strdup(ifr.ifr_name);
+}
+
+/**
+ * Implementation of iface_t.destroy.
+ */
+static void destroy(private_iface_t *this)
+{
+	if (this->bridge)
+	{
+		this->bridge->disconnect_iface(this->bridge, &this->public);
+	}
+	this->mconsole->del_iface(this->mconsole, this->guestif);
+	destroy_tap(this);
+	free(this->guestif);
+	free(this->hostif);
+	free(this);
+}
+
+/**
+ * create the iface instance
+ */
+iface_t *iface_create(char *guest, char *guestif, mconsole_t *mconsole)
+{
+	private_iface_t *this = malloc_thing(private_iface_t);
+	
+	this->public.get_hostif = (char*(*)(iface_t*))get_hostif;
+	this->public.get_guestif = (char*(*)(iface_t*))get_guestif;
+	this->public.set_bridge = (void(*)(iface_t*, bridge_t*))set_bridge;
+	this->public.destroy = (void*)destroy;
+
+	this->mconsole = mconsole;
+	this->guestif = strdup(guestif);
+	this->hostif = create_tap(this, guest);
+	this->bridge = NULL;
+	if (this->hostif == NULL)
+	{
+		destroy_tap(this);
+		free(this->guestif);
+		free(this);
+		return NULL;
+	}
+	if (!this->mconsole->add_iface(this->mconsole, this->guestif, this->hostif))
+	{
+		DBG1("creating interface '%s' in guest failed", this->guestif);
+		destroy_tap(this);
+		free(this->guestif);
+		free(this->hostif);
+		free(this);
+		return NULL;
+	}
+	return &this->public;
+}
+
diff --git a/src/dumm/iface.h b/src/dumm/iface.h
new file mode 100644
index 000000000..59de99f22
--- /dev/null
+++ b/src/dumm/iface.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2007 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.
+ */
+
+#ifndef IFACE_H
+#define IFACE_H
+
+#include <library.h>
+#include <utils/iterator.h>
+
+#define TAP_DEVICE "/dev/net/tun"
+
+typedef struct iface_t iface_t;
+
+#include "mconsole.h"
+#include "bridge.h"
+
+/**
+ * @brief Interface in a guest, connected to a tap device on the host.
+ */
+struct iface_t {
+	
+	/**
+	 * @brief Get the interface name in the guest (e.g. eth0).
+	 *
+	 * @return			guest interface name
+	 */
+	char* (*get_guestif)(iface_t *this);
+	
+	/**
+	 * @brief Get the interface name at the host (e.g. tap0).
+	 *
+	 * @return			host interface (tap device) name
+	 */
+	char* (*get_hostif)(iface_t *this);
+	
+	/**
+	 * @brief Set the bridge this interface is attached to.
+	 *
+	 * @param bridge	assigned bridge, or NULL for none
+	 */
+	void (*set_bridge)(iface_t *this, bridge_t *bridge);
+	
+	/*
+	bool (*up) (iface_t *this);
+	bool (*down) (iface_t *this);
+	bool (*add_addr) (iface_t *this, host_t *addr);
+	iterator_t* (*create_addr_iterator) (iface_t *this);
+	*/
+	
+	/**
+	 * @brief Destroy an interface
+	 */
+	void (*destroy) (iface_t *this);
+};
+
+/**
+ * @brief Create a new interface for a guest
+ *
+ * @param guest		name of the guest for this interface
+ * @param guestif	name of the interface in the guest
+ * @param mconsole	mconsole of guest
+ * @return			interface descriptor, or NULL if failed
+ */
+iface_t *iface_create(char *guest, char *guestif, mconsole_t *mconsole);
+
+#endif /* IFACE_H */
+
diff --git a/src/dumm/main.c b/src/dumm/main.c
new file mode 100644
index 000000000..d6e142e24
--- /dev/null
+++ b/src/dumm/main.c
@@ -0,0 +1,632 @@
+/*
+ * Copyright (C) 2007 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.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <library.h>
+#include <readline/readline.h>
+#include <readline/history.h>
+#include <dlfcn.h>
+#include <dirent.h>
+
+#include "dumm.h"
+
+/**
+ * global set of UMLs guests
+ */
+dumm_t *dumm;
+
+/**
+ * show usage information (program arguments)
+ */
+static void usage()
+{
+	printf("Usage:\n");
+	printf("  --dir|-d <path>            set working dir to <path>\n");
+	printf("  --help|-h                  show this help\n");
+}
+
+/**
+ * readline() wrapper
+ */
+static char* get_line(char *format, ...)
+{
+	char *line = NULL;
+	char *prompt = "";
+	va_list args;
+	
+	va_start(args, format);
+	vasprintf(&prompt, format, args);
+	va_end(args);
+	
+	while (TRUE)
+	{
+		line = readline(prompt);
+		if (line == NULL)
+		{
+			printf("quit\n");
+			dumm->destroy(dumm);
+			clear_history();
+			exit(0);
+		}
+		if (*line == '\0')
+		{
+			free(line);
+			continue;
+		}
+		add_history(line);
+		break;
+	}
+	free(prompt);
+	return line;
+}
+
+/**
+ * get a guest by name
+ */
+static guest_t* get_guest(char *name)
+{
+	iterator_t *iterator;
+	guest_t *guest = NULL;
+	
+	iterator = dumm->create_guest_iterator(dumm);
+	while (iterator->iterate(iterator, (void**)&guest))
+	{
+		if (streq(guest->get_name(guest), name))
+		{
+			break;
+		}
+		guest = NULL;
+	}
+	iterator->destroy(iterator);
+	return guest;
+}
+
+/**
+ * get a bridge by name
+ */
+static bridge_t* get_bridge(char *name)
+{
+	iterator_t *iterator;
+	bridge_t *bridge = NULL;
+	
+	iterator = dumm->create_bridge_iterator(dumm);
+	while (iterator->iterate(iterator, (void**)&bridge))
+	{
+		if (streq(bridge->get_name(bridge), name))
+		{
+			break;
+		}
+		bridge = NULL;
+	}
+	iterator->destroy(iterator);
+	return bridge;
+}
+
+/**
+ * get an interface by guest name
+ */
+static iface_t* get_iface(char *name, char *ifname)
+{
+	iterator_t *guests, *ifaces;
+	guest_t *guest;
+	iface_t *iface;
+	
+	guests = dumm->create_guest_iterator(dumm);
+	while (guests->iterate(guests, (void**)&guest))
+	{
+		if (streq(guest->get_name(guest), name))
+		{
+			iface = NULL;
+			ifaces = guest->create_iface_iterator(guest);
+			while (ifaces->iterate(ifaces, (void**)&iface))
+			{
+				if (streq(iface->get_guestif(iface), ifname))
+				{
+					break;
+				}
+				iface = NULL;
+			}
+			ifaces->destroy(ifaces);
+			if (iface)
+			{
+				break;
+			}
+		}
+	}
+	guests->destroy(guests);
+	return iface;
+}
+
+static void guest_addif_menu(guest_t *guest)
+{
+	char *name;
+	
+	name = get_line("interface name: ");
+	
+	if (!guest->create_iface(guest, name))
+	{
+		printf("creating interface failed\n");
+	}
+	free(name);
+}
+
+static void guest_delif_menu(guest_t *guest)
+{
+	char *name;
+	iface_t *iface;
+	iterator_t *iterator;
+	bool found = FALSE;
+	
+	name = get_line("interface name: ");
+	
+	iterator = guest->create_iface_iterator(guest);
+	while (iterator->iterate(iterator, (void**)&iface))
+	{
+		if (streq(iface->get_guestif(iface), name))
+		{
+			iterator->remove(iterator);
+			iface->destroy(iface);
+			found = TRUE;
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+	
+	if (!found)
+	{
+		printf("interface '%s' not found\n");
+	}
+	free(name);
+}
+
+static void guest_console(guest_t *guest)
+{
+	int con;
+	
+	for (con = 1; con <= 6; con++)
+	{
+		char *pts = guest->get_console(guest, con);
+		if (pts)
+		{
+			printf("%d: %s\n", con, pts);
+			free(pts);
+		}
+	}
+}
+
+static void guest_menu(guest_t *guest)
+{
+	while (TRUE)
+	{
+		char *line = get_line("guest/%s# ", guest->get_name(guest));
+		
+		if (streq(line, "back"))
+		{
+			free(line);
+			break;
+		}
+		else if (streq(line, "start"))
+		{
+			if (guest->start(guest))
+			{
+				printf("guest '%s' is running\n", guest->get_name(guest));
+			}
+			else
+			{
+				printf("failed to start guest '%s'\n", guest->get_name(guest));
+			}
+		}
+		else if (streq(line, "stop"))
+		{
+			printf("stopping guest '%s'...\n", guest->get_name(guest));
+			guest->stop(guest);
+			printf("guest '%s' is down\n", guest->get_name(guest));
+		}
+		else if (streq(line, "addif"))
+		{
+			guest_addif_menu(guest);
+		}
+		else if (streq(line, "delif"))
+		{
+			guest_delif_menu(guest);
+		}
+		else if (streq(line, "console"))
+		{
+			guest_console(guest);
+		}
+		else
+		{
+			printf("back|start|stop|addif|delif|console\n");
+		}
+		free(line);
+	}
+}
+
+static void guest_create_menu()
+{
+	char *name, *kernel, *master, *mem;
+	guest_t *guest;
+	
+	name = get_line("guest name: ");
+	kernel = get_line("kernel image: ");
+	master = get_line("master filesystem: ");
+	mem = get_line("amount of memory in MB: ");
+	
+	guest = dumm->create_guest(dumm, name, kernel, master, atoi(mem));
+	if (guest)
+	{
+		printf("guest '%s' created\n", guest->get_name(guest));
+		guest_menu(guest);
+	}
+	else
+	{
+		printf("failed to create guest '%s'\n", name);
+	}
+	free(name);
+	free(kernel);
+	free(master);
+	free(mem);
+}
+
+static void guest_list_menu()
+{
+	while (TRUE)
+	{
+		iterator_t *iterator;
+		guest_t *guest;
+		char *line = get_line("guest# ");
+		
+		if (streq(line, "back"))
+		{
+			free(line);
+			break;
+		}
+		else if (streq(line, "list"))
+		{
+			iterator = dumm->create_guest_iterator(dumm);
+			while (iterator->iterate(iterator, (void**)&guest))
+			{
+				printf("%s\n", guest->get_name(guest));
+			}
+			iterator->destroy(iterator);
+		}
+		else if (streq(line, "create"))
+		{
+			guest_create_menu();
+		}
+		else
+		{
+			guest = get_guest(line);
+			if (guest)
+			{
+				guest_menu(guest);
+			}
+			else
+			{
+				printf("back|list|create|<guest>\n");
+			}
+		}
+		free(line);
+	}
+}
+
+static void bridge_addif_menu(bridge_t *bridge)
+{
+	char *name, *ifname;
+	iface_t *iface;
+	
+	name = get_line("guest name: ");
+	ifname = get_line("interface name: ");
+	
+	iface = get_iface(name, ifname);
+	if (!iface)
+	{
+		printf("guest '%s' has no interface named '%s'\n", name, ifname);
+	}
+	else if (!bridge->connect_iface(bridge, iface))
+	{
+		printf("failed to add interface '%s' to bridge '%s'\n", ifname,
+			   bridge->get_name(bridge));
+	}
+	free(name);
+	free(ifname);
+}
+
+static void bridge_delif_menu(bridge_t *bridge)
+{
+	char *name, *ifname;
+	iface_t *iface;
+	
+	name = get_line("guest name: ");
+	ifname = get_line("interface name: ");
+	
+	iface = get_iface(name, ifname);
+	if (!iface)
+	{
+		printf("guest '%s' has no interface named '%s'\n", name, ifname);
+	}
+	else if (!bridge->disconnect_iface(bridge, iface))
+	{
+		printf("failed to remove interface '%s' from bridge '%s'\n", ifname,
+			   bridge->get_name(bridge));
+	}
+	free(name);
+	free(ifname);
+}
+
+static void bridge_menu(bridge_t *bridge)
+{
+	while (TRUE)
+	{
+		char *line = get_line("bridge/%s# ", bridge->get_name(bridge));
+		
+		if (streq(line, "back"))
+		{
+			free(line);
+			break;
+		}
+		else if (streq(line, "list"))
+		{
+			iterator_t *iterator;
+			iface_t *iface;
+
+			iterator = bridge->create_iface_iterator(bridge);
+			while (iterator->iterate(iterator, (void**)&iface))
+			{
+				printf("%s (%s)\n", iface->get_guestif(iface), iface->get_hostif(iface));
+			}
+			iterator->destroy(iterator);
+		}
+		else if (streq(line, "addif"))
+		{
+			bridge_addif_menu(bridge);
+		}
+		else if (streq(line, "delif"))
+		{
+			bridge_delif_menu(bridge);
+		}
+		else
+		{
+			printf("back|list|addif|delif\n");
+		}
+		free(line);
+	}
+}
+
+static void bridge_create_menu()
+{
+	char *name;
+	bridge_t *bridge;
+	
+	name = get_line("bridge name: ");
+	
+	bridge = dumm->create_bridge(dumm, name);
+	if (bridge)
+	{
+		printf("bridge '%s' created\n", bridge->get_name(bridge));
+		bridge_menu(bridge);
+	}
+	else
+	{
+		printf("failed to create bridge '%s'\n", name);
+	}
+	free(name);
+}
+
+static void bridge_list_menu()
+{
+	while (TRUE)
+	{
+		iterator_t *iterator;
+		bridge_t *bridge;
+		char *line = get_line("bridge# ");
+		
+		if (streq(line, "back"))
+		{
+			free(line);
+			break;
+		}
+		else if (streq(line, "list"))
+		{
+			iterator = dumm->create_bridge_iterator(dumm);
+			while (iterator->iterate(iterator, (void**)&bridge))
+			{
+				printf("%s\n", bridge->get_name(bridge));
+			}
+			iterator->destroy(iterator);
+		}
+		else if (streq(line, "create"))
+		{
+			bridge_create_menu();
+		}
+		else
+		{
+			bridge = get_bridge(line);
+			if (bridge)
+			{
+				bridge_menu(bridge);
+			}
+			else
+			{
+				printf("back|list|create|<bridge>\n");
+			}
+		}
+		free(line);
+	}
+}
+
+static void template_menu()
+{
+	char *name;
+	
+	name = get_line("template name (or 'none'): ");
+	
+	dumm->load_template(dumm, streq(name, "none") ? NULL : name);
+	
+	free(name);
+}
+
+typedef bool (*uml_test_t)(dumm_t *dumm);
+
+static void test_menu()
+{
+	char *name;
+	void *handle;
+	struct dirent *ent;
+	DIR *dir;
+	uml_test_t test;
+	
+	name = get_line("test name: ");
+	
+	dir = opendir("tests");
+	if (dir)
+	{
+		while ((ent = readdir(dir)))
+		{
+			char buf[PATH_MAX];
+			size_t len;
+			
+			len = strlen(ent->d_name);
+			if (strlen(ent->d_name) < 4 || !streq(ent->d_name + len - 3, ".so"))
+			{
+				continue;
+			}
+			
+			snprintf(buf, sizeof(buf), "%s/%s", "tests", ent->d_name);
+			handle = dlopen(buf, RTLD_LAZY);
+			if (!handle)
+			{
+				printf("failed to open test %s\n", ent->d_name);
+				continue;
+			}
+			test = dlsym(handle, "test");
+			if (test && dumm->load_template(dumm, ent->d_name))
+			{
+				printf("running test %s: ", ent->d_name);
+				if (test(dumm))
+				{
+					printf("success\n");
+				}
+				else
+				{
+					printf("failed\n");
+				}
+			}
+			else
+			{
+				printf("failed to open test %s\n", ent->d_name);
+			}
+			dlclose(handle);
+		}
+	}
+	free(name);
+}
+
+/**
+ * Signal handler 
+ */
+void signal_action(int sig, siginfo_t *info, void *ucontext)
+{
+	dumm->destroy(dumm);
+	clear_history();
+	exit(0);
+}
+
+/**
+ * main routine, parses args and reads from console
+ */
+int main(int argc, char *argv[])
+{
+	struct sigaction action;
+	char *dir = ".";
+
+	while (TRUE)
+	{
+		struct option options[] = {
+			{"dir", 1, 0, 0},
+			{"help", 0, 0, 0},
+			{0, 0, 0, 0}
+		};
+		
+		switch (getopt_long(argc, argv, "d:h", options, NULL)) 
+		{
+			case -1:
+				break;
+			case 'd':
+				dir = optarg;
+				continue;
+			case 'h':
+				usage();
+				return 0;
+			default:
+				usage();
+				return 1;
+		}
+		break;
+	}
+	
+	memset(&action, 0, sizeof(action));
+	action.sa_sigaction = signal_action;
+	action.sa_flags = SA_SIGINFO;
+	if (sigaction(SIGINT, &action, NULL) != 0 ||
+		sigaction(SIGQUIT, &action, NULL) != 0 ||
+		sigaction(SIGTERM, &action, NULL) != 0)
+	{
+		printf("signal handler setup failed: %m.\n");
+		return 1;
+	}
+	
+	dumm = dumm_create(dir);
+	while (TRUE)
+	{
+		char *line = get_line("# ");
+		
+		if (streq(line, "quit"))
+		{
+			free(line);
+			break;
+		}
+		else if (streq(line, "guest"))
+		{
+			guest_list_menu();
+		}
+		else if (streq(line, "bridge"))
+		{
+			bridge_list_menu();
+		}
+		else if (streq(line, "template"))
+		{
+			template_menu();
+		}
+		else if (streq(line, "test"))
+		{
+			test_menu();
+		}
+		else
+		{
+			printf("quit|guest|bridge|template|test\n");
+		}
+		free(line);
+	}
+	dumm->load_template(dumm, NULL);
+	dumm->destroy(dumm);
+	clear_history();
+	return 0;
+}
+
diff --git a/src/dumm/mconsole.c b/src/dumm/mconsole.c
new file mode 100644
index 000000000..25cb84621
--- /dev/null
+++ b/src/dumm/mconsole.c
@@ -0,0 +1,349 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ * Copyright (C) 2001-2004 Jeff Dike
+ *
+ * Based on the "uml_mconsole" utility from Jeff Dike.
+ *
+ * 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.
+ */
+
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include <sys/un.h>
+
+#include <debug.h>
+
+#include "mconsole.h"
+
+#define MCONSOLE_MAGIC 0xcafebabe
+#define MCONSOLE_VERSION 2
+#define MCONSOLE_MAX_DATA 512
+
+typedef struct private_mconsole_t private_mconsole_t;
+
+struct private_mconsole_t {
+	/** public interface */
+	mconsole_t public;
+	/** mconsole socket */
+	int console;
+	/** notify socket */
+	int notify;
+	/** address of uml socket */
+	struct sockaddr_un uml;
+};
+
+/**
+ * mconsole message format from "arch/um/include/mconsole.h"
+ */
+typedef struct mconsole_request mconsole_request;
+/** mconsole request message */
+struct mconsole_request {
+	u_int32_t magic;
+	u_int32_t version;
+	u_int32_t len;
+	char data[MCONSOLE_MAX_DATA];
+};
+
+
+typedef struct mconsole_reply mconsole_reply;
+/** mconsole reply message */
+struct mconsole_reply {
+	u_int32_t err;
+	u_int32_t more;
+	u_int32_t len;
+	char data[MCONSOLE_MAX_DATA];
+};
+
+typedef struct mconsole_notify mconsole_notify;
+/** mconsole notify message */
+struct mconsole_notify {
+    u_int32_t magic;
+    u_int32_t version;
+    enum {
+		MCONSOLE_SOCKET,
+		MCONSOLE_PANIC,
+		MCONSOLE_HANG,
+		MCONSOLE_USER_NOTIFY,
+    } type;
+    u_int32_t len;
+    char data[MCONSOLE_MAX_DATA];
+};
+
+/**
+ * send a request to UML using mconsole
+ */
+static int request(private_mconsole_t *this, char *command,
+				   char buf[], size_t *size)
+{
+	mconsole_request request;
+	mconsole_reply reply;
+	int len, total = 0;
+	
+	memset(&request, 0, sizeof(request));
+	request.magic = MCONSOLE_MAGIC;
+	request.version = MCONSOLE_VERSION;
+	request.len = min(strlen(command), sizeof(reply.data) - 1);
+	strncpy(request.data, command, request.len);
+	*buf = '\0';
+	(*size)--;
+
+	if (sendto(this->console, &request, sizeof(request), 0,
+		(struct sockaddr*)&this->uml, sizeof(this->uml)) < 0)
+	{
+		snprintf(buf, *size, "sending mconsole command to UML failed: %m");
+		return -1;
+	}
+	do 
+	{
+		len = recv(this->console, &reply, sizeof(reply), 0);
+		if (len < 0)
+		{
+			snprintf(buf, *size, "receiving from mconsole failed: %m");
+	    	return -1;
+		}
+		if (len > 0)
+		{
+			strncat(buf, reply.data, min(reply.len, *size - total));
+			total += reply.len;
+		}
+	}
+	while (reply.more);
+	
+	*size = total;
+	return reply.err;
+}
+
+/**
+ * Implementation of mconsole_t.add_iface.
+ */
+static bool add_iface(private_mconsole_t *this, char *guest, char *host)
+{
+	char buf[128];
+	int len;
+	
+	len = snprintf(buf, sizeof(buf), "config %s=tuntap,%s", guest, host);
+	if (len < 0 || len >= sizeof(buf))
+	{
+		return FALSE;
+	}
+	len = sizeof(buf);
+	if (request(this, buf, buf, &len) != 0)
+	{
+		DBG1("adding interface failed: %.*s", len, buf);
+		return FALSE;
+	}
+	return TRUE;
+}
+
+/**
+ * Implementation of mconsole_t.del_iface.
+ */
+static bool del_iface(private_mconsole_t *this, char *guest)
+{
+	char buf[128];
+	int len;
+	
+	len = snprintf(buf, sizeof(buf), "remove %s", guest);
+	if (len < 0 || len >= sizeof(buf))
+	{
+		return FALSE;
+	}
+	if (request(this, buf, buf, &len) != 0)
+	{
+		DBG1("removing interface failed: %.*s", len, buf);
+		return FALSE;
+	}
+	return TRUE;
+}
+	
+/**
+ * Implementation of mconsole_t.get_console_pts.
+ */
+static char* get_console_pts(private_mconsole_t *this, int con)
+{
+	char buf[128];
+	char *pos;
+	int len;
+	
+	len = snprintf(buf, sizeof(buf), "config con%d", con);
+	if (len < 0 || len >= sizeof(buf))
+	{
+		return NULL;
+	}
+	len = sizeof(buf);
+	if (request(this, buf, buf, &len) != 0)
+	{
+		DBG1("getting console pts failed: %.*s", len, buf);
+		return NULL;
+	}
+	pos = memchr(buf, ':', len);
+	if (pos == NULL)
+	{
+		return NULL;
+	}
+	pos++;
+	return strndup(pos, len - (pos - buf));
+}
+
+/**
+ * Poll until guest is ready
+ */
+static bool wait_bootup(private_mconsole_t *this)
+{
+	char *cmd, buf[128];
+	int len, res;
+	
+	cmd = "config con0";
+	while (TRUE)
+	{
+		len = sizeof(buf);
+		res = request(this, cmd, buf, &len);
+		if (res < 0)
+		{
+			return FALSE;
+		}
+		if (res == 0)
+		{
+			return TRUE;
+		}
+		usleep(50000);
+	}
+}
+
+/**
+ * Implementation of mconsole_t.destroy.
+ */
+static void destroy(private_mconsole_t *this)
+{
+	close(this->console);
+	close(this->notify);
+	free(this);
+}
+
+/**
+ * setup the mconsole notify connection and wait for its readyness
+ */
+static bool wait_for_notify(private_mconsole_t *this, char *nsock)
+{
+	struct sockaddr_un addr;
+	mconsole_notify notify;
+	int len;
+
+	this->notify = socket(AF_UNIX, SOCK_DGRAM, 0);
+	if (this->notify < 0)
+	{
+		DBG1("opening mconsole notify socket failed: %m");
+		return FALSE;
+	}
+	memset(&addr, 0, sizeof(addr));
+	addr.sun_family = AF_UNIX;
+	strncpy(addr.sun_path, nsock, sizeof(addr));
+	if (bind(this->notify, (struct sockaddr*)&addr, sizeof(addr)) < 0)
+	{
+		DBG1("binding mconsole notify socket to '%s' failed: %m", nsock);
+		close(this->notify);
+		return FALSE;
+	}
+	do
+	{
+		len = recvfrom(this->notify, &notify, sizeof(notify), 0, NULL, 0);
+	} while (len < 0 && errno == EINTR);
+	if (len < 0 || len >= sizeof(notify))
+	{
+		DBG1("reading from mconsole notify socket failed: %m");
+		close(this->notify);
+		unlink(nsock);
+		return FALSE;
+	}
+	if (notify.magic != MCONSOLE_MAGIC ||
+		notify.version != MCONSOLE_VERSION ||
+		notify.type != MCONSOLE_SOCKET)
+	{
+		DBG1("received unexpected message from mconsole notify socket: %b",
+			 &notify, sizeof(notify));
+		close(this->notify);
+		unlink(nsock);
+		return FALSE;
+	}
+	memset(&this->uml, 0, sizeof(this->uml));
+	this->uml.sun_family = AF_UNIX;
+	strncpy(this->uml.sun_path, (char*)&notify.data, sizeof(this->uml.sun_path));
+	return TRUE;
+}
+
+/**
+ * setup the mconsole console connection
+ */
+static bool setup_console(private_mconsole_t *this)
+{
+	struct sockaddr_un addr;
+	
+	this->console = socket(AF_UNIX, SOCK_DGRAM, 0);
+	if (this->console < 0)
+	{
+		DBG1("opening mconsole socket failed: %m");
+		return FALSE;
+	}
+	memset(&addr, 0, sizeof(addr));
+	addr.sun_family = AF_UNIX;
+	snprintf(&addr.sun_path[1], sizeof(addr.sun_path), "%5d-%d",
+			 getpid(), this->console);
+	if (bind(this->console, (struct sockaddr*)&addr, sizeof(addr)) < 0)
+	{
+		DBG1("binding mconsole socket to '%s' failed: %m", &addr.sun_path[1]);
+		close(this->console);
+		return FALSE;
+	}
+	return TRUE;
+}
+
+/**
+ * create the mconsole instance
+ */
+mconsole_t *mconsole_create(char *notify)
+{
+	private_mconsole_t *this = malloc_thing(private_mconsole_t);
+	
+	this->public.add_iface = (bool(*)(mconsole_t*, char *guest, char *host))add_iface;
+	this->public.del_iface = (bool(*)(mconsole_t*, char *guest))del_iface;
+	this->public.get_console_pts = (char*(*)(mconsole_t*, int con))get_console_pts;
+	this->public.destroy = (void*)destroy;
+	
+	if (!wait_for_notify(this, notify))
+	{
+		free(this);
+		return NULL;
+	}
+	
+	if (!setup_console(this))
+	{
+		close(this->notify);
+		unlink(notify);
+		free(this);
+		return NULL;
+	}
+	unlink(notify);
+	
+	if (!wait_bootup(this))
+	{
+		destroy(this);
+		return NULL;
+	}
+	
+	return &this->public;
+}
+
diff --git a/src/dumm/mconsole.h b/src/dumm/mconsole.h
new file mode 100644
index 000000000..53aaa1b8b
--- /dev/null
+++ b/src/dumm/mconsole.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2007 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.
+ */
+
+#ifndef MCONSOLE_H
+#define MCONSOLE_H
+
+#include <library.h>
+
+typedef struct mconsole_t mconsole_t;
+
+/**
+ * @brief UML mconsole, change running UML configuration using mconsole.
+ */
+struct mconsole_t {
+	
+	/**
+	 * @brief Create a guest interface and connect it to tap host interface.
+	 *
+	 * @param guest			name of the interface to create in the guest
+	 * @param host			name of the tap device to connect guest to
+	 * @return				TRUE if interface created
+	 */
+	bool (*add_iface)(mconsole_t *this, char *guest, char *host);
+	
+	/**
+	 * @brief Delete a guest interface.
+	 *
+	 * @param guest			name of the interface to delete on the guest
+	 * @return				TRUE if interface deleted
+	 */
+	bool (*del_iface)(mconsole_t *this, char *guest);
+	
+	/**
+	 * @brief Get the pts device file assigned to a console.
+	 *
+	 * @param con			console number in guest
+	 * @return				allocated device string
+	 */
+	char* (*get_console_pts)(mconsole_t *this, int con);
+	
+	/**
+	 * @brief Destroy the mconsole instance
+	 */
+	void (*destroy) (mconsole_t *this);
+};
+
+/**
+ * @brief Create a new mconsole connection to a guest.
+ *
+ * Waits for a notification from the guest through the notify socket and tries
+ * to connect to the mconsole socket supplied in the received notification.
+ *
+ * @param notify			unix notify socket path
+ * @return					mconsole instance, or NULL if failed
+ */
+mconsole_t *mconsole_create(char *notify);
+
+#endif /* MCONSOLE_H */
+