diff --git a/shared/ggate.c b/shared/ggate.c
new file mode 100644
index 0000000..9002b91
--- /dev/null
+++ b/shared/ggate.c
@@ -0,0 +1,330 @@
+/*-
+ * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/param.h>
+#include <sys/disk.h>
+#include <sys/stat.h>
+#include <sys/endian.h>
+#include <sys/socket.h>
+#include <sys/linker.h>
+#include <sys/module.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <signal.h>
+#include <err.h>
+#include <errno.h>
+#include <string.h>
+#include <strings.h>
+#include <libgen.h>
+#include <netdb.h>
+#include <syslog.h>
+#include <stdarg.h>
+#include <libgeom.h>
+
+#include <geom/gate/g_gate.h>
+#include "ggate.h"
+
+
+int g_gate_devfd = -1;
+int g_gate_verbose = 0;
+
+
+void
+g_gate_vlog(int priority, const char *message, va_list ap)
+{
+
+	if (g_gate_verbose) {
+		const char *prefix;
+
+		switch (priority) {
+		case LOG_ERR:
+			prefix = "error";
+			break;
+		case LOG_WARNING:
+			prefix = "warning";
+			break;
+		case LOG_NOTICE:
+			prefix = "notice";
+			break;
+		case LOG_INFO:
+			prefix = "info";
+			break;
+		case LOG_DEBUG:
+			prefix = "debug";
+			break;
+		default:
+			prefix = "unknown";
+		}
+
+		printf("%s: ", prefix);
+		vprintf(message, ap);
+		printf("\n");
+	} else {
+		if (priority != LOG_DEBUG)
+			vsyslog(priority, message, ap);
+	}
+}
+
+void
+g_gate_log(int priority, const char *message, ...)
+{
+	va_list ap;
+
+	va_start(ap, message);
+	g_gate_vlog(priority, message, ap);
+	va_end(ap);
+}
+
+void
+g_gate_xvlog(const char *message, va_list ap)
+{
+
+	g_gate_vlog(LOG_ERR, message, ap);
+	g_gate_vlog(LOG_ERR, "Exiting.", ap);
+	exit(EXIT_FAILURE);
+}
+
+void
+g_gate_xlog(const char *message, ...)
+{
+	va_list ap;
+
+	va_start(ap, message);
+	g_gate_xvlog(message, ap);
+	/* NOTREACHED */
+	va_end(ap);
+	exit(EXIT_FAILURE);
+}
+
+off_t
+g_gate_mediasize(int fd)
+{
+	off_t mediasize;
+	struct stat sb;
+
+	if (fstat(fd, &sb) < 0)
+		g_gate_xlog("fstat(): %s.", strerror(errno));
+	if (S_ISCHR(sb.st_mode)) {
+		if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) < 0) {
+			g_gate_xlog("Can't get media size: %s.",
+			    strerror(errno));
+		}
+	} else if (S_ISREG(sb.st_mode)) {
+		mediasize = sb.st_size;
+	} else {
+		g_gate_xlog("Unsupported file system object.");
+	}
+	return (mediasize);
+}
+
+size_t
+g_gate_sectorsize(int fd)
+{
+	size_t secsize;
+	struct stat sb;
+
+	if (fstat(fd, &sb) < 0)
+		g_gate_xlog("fstat(): %s.", strerror(errno));
+	if (S_ISCHR(sb.st_mode)) {
+		if (ioctl(fd, DIOCGSECTORSIZE, &secsize) < 0) {
+                        g_gate_xlog("Can't get sector size: %s.",
+			    strerror(errno));
+		}
+	} else if (S_ISREG(sb.st_mode)) {
+		secsize = 512;
+	} else {
+		g_gate_xlog("Unsupported file system object.");
+	}
+	return (secsize);
+}
+
+void
+g_gate_open_device(void)
+{
+
+	g_gate_devfd = open("/dev/" G_GATE_CTL_NAME, O_RDWR, 0);
+	if (g_gate_devfd < 0)
+		err(EXIT_FAILURE, "open(/dev/%s)", G_GATE_CTL_NAME);
+}
+
+void
+g_gate_close_device(void)
+{
+
+	close(g_gate_devfd);
+}
+
+void
+g_gate_ioctl(unsigned long req, void *data)
+{
+
+	if (ioctl(g_gate_devfd, req, data) < 0) {
+		g_gate_xlog("%s: ioctl(/dev/%s): %s.", getprogname(),
+		    G_GATE_CTL_NAME, strerror(errno));
+	}
+}
+
+void
+g_gate_destroy(int unit, int force)
+{
+	struct g_gate_ctl_destroy ggio;
+
+	ggio.gctl_version = G_GATE_VERSION;
+	ggio.gctl_unit = unit;
+	ggio.gctl_force = force;
+	g_gate_ioctl(G_GATE_CMD_DESTROY, &ggio);
+}
+
+int
+g_gate_openflags(unsigned ggflags)
+{
+
+	if ((ggflags & G_GATE_FLAG_READONLY) != 0)
+		return (O_RDONLY);
+	else if ((ggflags & G_GATE_FLAG_WRITEONLY) != 0)
+		return (O_WRONLY);
+	return (O_RDWR);
+}
+
+void
+g_gate_load_module(void)
+{
+
+	if (modfind("g_gate") < 0) {
+		/* Not present in kernel, try loading it. */
+		if (kldload("geom_gate") < 0 || modfind("g_gate") < 0) {
+			if (errno != EEXIST) {
+				errx(EXIT_FAILURE,
+				    "geom_gate module not available!");
+			}
+		}
+	}
+}
+
+#ifdef LIBGEOM
+static struct gclass *
+find_class(struct gmesh *mesh, const char *name)
+{
+	struct gclass *class;
+
+	LIST_FOREACH(class, &mesh->lg_class, lg_class) {
+		if (strcmp(class->lg_name, name) == 0)
+			return (class);
+	}
+	return (NULL);
+}
+
+static const char *
+get_conf(struct ggeom *gp, const char *name)
+{
+	struct gconfig *conf;
+
+	LIST_FOREACH(conf, &gp->lg_config, lg_config) {
+		if (strcmp(conf->lg_name, name) == 0)
+			return (conf->lg_val);
+	}
+	return (NULL);
+}
+
+static void
+show_config(struct ggeom *gp, int verbose)
+{
+	struct gprovider *pp;
+
+	pp = LIST_FIRST(&gp->lg_provider);
+	if (pp == NULL)
+		return;
+	if (!verbose) {
+		printf("%s\n", pp->lg_name);
+		return;
+	}
+	printf("       NAME: %s\n", pp->lg_name);
+	printf("       info: %s\n", get_conf(gp, "info"));
+	printf("     access: %s\n", get_conf(gp, "access"));
+	printf("    timeout: %s\n", get_conf(gp, "timeout"));
+	printf("queue_count: %s\n", get_conf(gp, "queue_count"));
+	printf(" queue_size: %s\n", get_conf(gp, "queue_size"));
+	printf(" references: %s\n", get_conf(gp, "ref"));
+	printf("  mediasize: %jd\n", pp->lg_mediasize);
+	printf(" sectorsize: %u\n", pp->lg_sectorsize);
+	printf("       mode: %s\n", pp->lg_mode);
+	printf("\n");
+}
+
+void
+g_gate_list(int unit, int verbose)
+{
+	struct gmesh mesh;
+	struct gclass *class;
+	struct ggeom *gp;
+	char name[64];
+	int error;
+
+	error = geom_gettree(&mesh);
+	if (error != 0)
+		exit(EXIT_FAILURE);
+	class = find_class(&mesh, G_GATE_CLASS_NAME);
+	if (class == NULL) {
+		geom_deletetree(&mesh);
+		exit(EXIT_SUCCESS);
+	}
+	if (unit >= 0) {
+		snprintf(name, sizeof(name), "%s%d", G_GATE_PROVIDER_NAME,
+		    unit);
+	}
+	LIST_FOREACH(gp, &class->lg_geom, lg_geom) {
+		if (unit != -1 && strcmp(gp->lg_name, name) != 0)
+			continue;
+		show_config(gp, verbose);
+	}
+	geom_deletetree(&mesh);
+	exit(EXIT_SUCCESS);
+}
+#endif	/* LIBGEOM */
+
+in_addr_t
+g_gate_str2ip(const char *str)
+{
+	struct hostent *hp;
+	in_addr_t ip;
+
+	ip = inet_addr(str);
+	if (ip != INADDR_NONE) {
+		/* It is a valid IP address. */
+		return (ip);
+	}
+	/* Check if it is a valid host name. */
+	hp = gethostbyname(str);
+	if (hp == NULL)
+		return (INADDR_NONE);
+	return (((struct in_addr *)(hp->h_addr))->s_addr);
+}
diff --git a/shared/ggate.h b/shared/ggate.h
new file mode 100644
index 0000000..d4d8253
--- /dev/null
+++ b/shared/ggate.h
@@ -0,0 +1,143 @@
+/*-
+ * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _GGATE_H_
+#define	_GGATE_H_
+
+#include <sys/endian.h>
+
+#define	G_GATE_BUFSIZE_START	65536
+#define	G_GATE_PORT		3080
+
+#define	G_GATE_RCVBUF		131072
+#define	G_GATE_SNDBUF		131072
+#define	G_GATE_QUEUE_SIZE	1024
+#define	G_GATE_TIMEOUT		30
+
+extern int g_gate_devfd;
+extern int g_gate_verbose;
+
+/* Client's initial packet. */
+struct g_gate_cinit {
+	char	gc_path[PATH_MAX + 1];
+	uint8_t	gc_flags;
+};
+
+/* Server's initial packet. */
+struct g_gate_sinit {
+	uint8_t		gs_flags;
+	uint64_t	gs_mediasize;
+	uint32_t	gs_sectorsize;
+	uint16_t	gs_error;
+};
+
+/* Control struct. */
+struct g_gate_hdr {
+	uint8_t		gh_cmd;		/* command */
+	uint64_t	gh_offset;	/* device offset */
+	uint32_t	gh_length;	/* size of block */
+	int16_t		gh_error;	/* error value (0 if ok) */
+};
+
+void	g_gate_vlog(int priority, const char *message, va_list ap);
+void	g_gate_log(int priority, const char *message, ...);
+void	g_gate_xvlog(const char *message, va_list ap);
+void	g_gate_xlog(const char *message, ...);
+off_t	g_gate_mediasize(int fd);
+size_t	g_gate_sectorsize(int fd);
+void	g_gate_open_device(void);
+void	g_gate_close_device(void);
+void	g_gate_ioctl(unsigned long req, void *data);
+void	g_gate_destroy(int unit, int force);
+int	g_gate_openflags(unsigned ggflags);
+void	g_gate_load_module(void);
+#ifdef LIBGEOM
+void	g_gate_list(int unit, int verbose);
+#endif
+in_addr_t g_gate_str2ip(const char *str);
+
+/*
+ * g_gate_swap2h_* - functions swap bytes to host byte order (from big endian).
+ * g_gate_swap2n_* - functions swap bytes to network byte order (actually
+ *                   to big endian byte order).
+ */
+
+static __inline void
+g_gate_swap2h_cinit(struct g_gate_cinit *cinit __unused)
+{
+
+	/* Nothing here for now. */
+}
+
+static __inline void
+g_gate_swap2n_cinit(struct g_gate_cinit *cinit __unused)
+{
+
+	/* Nothing here for now. */
+}
+
+static __inline void
+g_gate_swap2h_sinit(struct g_gate_sinit *sinit)
+{
+
+	/* Swap only used fields. */
+	sinit->gs_mediasize = be64toh(sinit->gs_mediasize);
+	sinit->gs_sectorsize = be32toh(sinit->gs_sectorsize);
+	sinit->gs_error = be16toh(sinit->gs_error);
+}
+
+static __inline void
+g_gate_swap2n_sinit(struct g_gate_sinit *sinit)
+{
+
+	/* Swap only used fields. */
+	sinit->gs_mediasize = htobe64(sinit->gs_mediasize);
+	sinit->gs_sectorsize = htobe32(sinit->gs_sectorsize);
+	sinit->gs_error = htobe16(sinit->gs_error);
+}
+
+static __inline void
+g_gate_swap2h_hdr(struct g_gate_hdr *hdr)
+{
+
+	/* Swap only used fields. */
+	hdr->gh_offset = be64toh(hdr->gh_offset);
+	hdr->gh_length = be32toh(hdr->gh_length);
+	hdr->gh_error = be16toh(hdr->gh_error);
+}
+
+static __inline void
+g_gate_swap2n_hdr(struct g_gate_hdr *hdr)
+{
+
+	/* Swap only used fields. */
+	hdr->gh_offset = htobe64(hdr->gh_offset);
+	hdr->gh_length = htobe32(hdr->gh_length);
+	hdr->gh_error = htobe16(hdr->gh_error);
+}
+#endif	/* _GGATE_H_ */