X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fvnd.c;fp=src%2Fvnd.c;h=7eba993a280e63947246fa99ae94a1486175d43d;hb=ff03bb9b0a744530e1145fef656644987a10d62d;hp=0000000000000000000000000000000000000000;hpb=56c51e94a620dd91eeb510176b9c970af9a9a372;p=tinc

diff --git a/src/vnd.c b/src/vnd.c
new file mode 100644
index 00000000..7eba993a
--- /dev/null
+++ b/src/vnd.c
@@ -0,0 +1,150 @@
+/*
+    vnd.c -- virtual network device management
+
+    Copyright (C) 2003-2004 Guus Sliepen <guus@tinc-vpn.org>,
+                  2003-2004 Ivo Timmermans <ivo@tinc-vpn.org>
+
+    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.
+
+    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.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+    $Id$
+*/
+
+#include "system.h"
+
+#include <linux/if_tun.h>
+
+#include "fd/fd.h"
+#include "logger/logger.h"
+#include "support/xalloc.h"
+
+#include "vnd/vnd.h"
+
+vnd_t *vnd_new(void) {
+	vnd_t *vnd;
+
+	return clear(new(vnd));
+}
+
+void vnd_free(vnd_t *vnd) {
+	replace(vnd->device, NULL);
+	replace(vnd->interface, NULL);
+	replace(vnd->description, NULL);
+	free(vnd);
+}
+
+void vnd_set(vnd_t *vnd, char *device, char *interface, vnd_mode_t mode, vnd_handler_t recv) {
+	replace(vnd->device, device);
+	replace(vnd->interface, interface);
+	vnd->mode = mode;
+	vnd->recv = recv;
+}
+
+static bool vnd_send(vnd_t *vnd, const void *buf, int len) {
+	int result;
+
+	result = write(vnd->fd.fd, buf, len);
+
+	if(result == len || result < 0 && (errno == EINTR || errno == EAGAIN)) {
+		logger(LOG_INFO, _("vnd: wrote packet of %d bytes to %s"), len, vnd->description);
+		return true;
+	}
+
+	logger(LOG_INFO, _("vnd: error writing packet of %d bytes to %s: %s"), len, vnd->description, strerror(errno));
+
+	return false;
+}
+
+static bool vnd_recv_handler(fd_t *fd) {
+	vnd_t *vnd = fd->data;
+	char buf[vnd->mtu];
+	int len;
+
+	vnd = fd->data;
+
+	len = read(fd->fd, buf, sizeof buf);
+
+	if(len > 0) {
+		logger(LOG_INFO, _("vnd: read packet of %d bytes from %s"), len, vnd->description);
+		return vnd->recv(vnd, buf, len);
+	}
+
+	if(len < 0 && (errno == EINTR || errno == EAGAIN))
+		return true;
+
+	logger(LOG_ERR, _("vnd: error reading packet from %s: %s"), vnd->description, strerror(errno));
+
+	return false;
+}
+
+bool vnd_open(vnd_t *vnd) {
+	struct ifreq ifr = {0};
+	
+	if(!vnd->device)
+		vnd->device = xstrdup("/dev/net/tun");
+	
+	vnd->fd.fd = open(vnd->device, O_RDWR | O_NONBLOCK);
+
+	if(vnd->fd.fd < 0) {
+		logger(LOG_ERR, _("vnd: could not open %s: %s"), vnd->device, strerror(errno));
+		return false;
+	}
+
+	if(vnd->mode == VND_MODE_TUN)
+		ifr.ifr_flags = IFF_TUN;
+	else
+		ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+
+	if(vnd->interface)
+		strncpy(ifr.ifr_name, vnd->interface, IFNAMSIZ);
+
+	if(!ioctl(vnd->fd.fd, TUNSETIFF, &ifr)) {
+		if(vnd->interface)
+			free(vnd->interface);
+		vnd->interface = xstrdup(ifr.ifr_name);
+	} else {
+		logger(LOG_ERR, _("vnd: %s is not a Linux tun/tap device"), vnd->device);
+		return false;
+	}
+
+	if(!vnd->mtu)
+		vnd->mtu = 1514;
+
+	vnd->send = vnd_send;
+	vnd->fd.read = vnd_recv_handler;
+	vnd->fd.data = vnd;
+
+	if(vnd->description)
+		free(vnd->description);
+
+	asprintf(&vnd->description, "Linux tun/tap device %s (interface %s)", vnd->device, vnd->interface);
+
+	if(!fd_add(&vnd->fd))
+		return false;
+
+	logger(LOG_INFO, _("vnd: opened %s"), vnd->description);
+
+	return true;
+}
+
+bool vnd_close(vnd_t *vnd) {
+	fd_del(&vnd->fd);
+
+	close(vnd->fd.fd);
+
+	logger(LOG_INFO, _("vnd: closed %s"), vnd->description);
+
+	return true;
+}
+