From: Guus Sliepen <guus@tinc-vpn.org>
Date: Thu, 18 Jul 2002 14:30:45 +0000 (+0000)
Subject: Added support for raw sockets. This can be used instead of tun/tap devices.
X-Git-Tag: import-tinc-1.1~785^2~258
X-Git-Url: https://git.meshlink.io/?a=commitdiff_plain;h=18948c5784bfedf0dd5a371e41bc2cceee76d92e;p=meshlink

Added support for raw sockets. This can be used instead of tun/tap devices.
---

diff --git a/src/raw_socket/device.c b/src/raw_socket/device.c
new file mode 100644
index 00000000..054afeef
--- /dev/null
+++ b/src/raw_socket/device.c
@@ -0,0 +1,174 @@
+/*
+    device.c -- raw socket
+    Copyright (C) 2002 Ivo Timmermans <ivo@o2w.nl>,
+                  2002 Guus Sliepen <guus@sliepen.eu.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: device.c,v 1.1.2.1 2002/07/18 14:30:45 guus Exp $
+*/
+
+#include "config.h"
+
+#include <stdio.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <net/if.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <netpacket/packet.h>
+#include <net/ethernet.h>
+
+#include <utils.h>
+#include "conf.h"
+#include "net.h"
+#include "subnet.h"
+
+#include "system.h"
+
+int device_fd = -1;
+int device_type;
+char *device;
+char *interface;
+char ifrname[IFNAMSIZ];
+char *device_info;
+
+int device_total_in = 0;
+int device_total_out = 0;
+
+extern subnet_t mymac;
+
+/*
+  open the local ethertap device
+*/
+int setup_device(void)
+{
+  struct ifreq ifr;
+  struct sockaddr_ll sa;
+cp
+  if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
+    interface = "eth0";
+
+  if(!get_config_string(lookup_config(config_tree, "Device"), &device))
+    device = interface;
+
+  device_info = _("raw socket");
+cp
+  if((device_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0)
+    {
+      syslog(LOG_ERR, _("Could not open %s: %s"), device_info, strerror(errno));
+      return -1;
+    }
+
+  memset(&ifr, 0, sizeof(ifr));
+  strncpy(ifr.ifr_ifrn.ifrn_name, interface, IFNAMSIZ);
+  if(ioctl(device_fd, SIOCGIFINDEX, &ifr))
+    {
+      close(device_fd);
+      syslog(LOG_ERR, _("Can't find interface %s: %s"), interface, strerror(errno));
+      return -1;
+    }
+
+  memset(&sa, '0', sizeof(sa));
+  sa.sll_family = AF_PACKET;
+  sa.sll_protocol = htons(ETH_P_ALL);
+  sa.sll_ifindex = ifr.ifr_ifindex;
+
+  if(bind(device_fd, (struct sockaddr *)&sa, (socklen_t)sizeof(sa)))
+    {
+      syslog(LOG_ERR, _("Could not bind to %s: %s"), device, strerror(errno));
+      return -1;
+    }
+cp
+  /* Set default MAC address for ethertap devices */
+
+  mymac.type = SUBNET_MAC;
+  mymac.net.mac.address.x[0] = 0xfe;
+  mymac.net.mac.address.x[1] = 0xfd;
+  mymac.net.mac.address.x[2] = 0x00;
+  mymac.net.mac.address.x[3] = 0x00;
+  mymac.net.mac.address.x[4] = 0x00;
+  mymac.net.mac.address.x[5] = 0x00;
+
+  syslog(LOG_INFO, _("%s is a %s"), device, device_info);
+cp
+  return 0;
+}
+
+void close_device(void)
+{
+cp
+  close(device_fd);
+}
+
+/*
+  read, encrypt and send data that is
+  available through the ethertap device
+*/
+int read_packet(vpn_packet_t *packet)
+{
+  int lenin;
+cp
+
+  if((lenin = read(device_fd, packet->data, MTU)) <= 0)
+    {
+      syslog(LOG_ERR, _("Error while reading from %s %s: %s"), device_info, device, strerror(errno));
+      return -1;
+    }
+
+  packet->len = lenin;
+
+  device_total_in += packet->len;
+
+  if(debug_lvl >= DEBUG_TRAFFIC)
+    {
+      syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len, device_info);
+    }
+
+  return 0;
+cp
+}
+
+int write_packet(vpn_packet_t *packet)
+{
+cp
+  if(debug_lvl >= DEBUG_TRAFFIC)
+    syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
+           packet->len, device_info);
+
+  if(write(device_fd, packet->data, packet->len) < 0)
+    {
+      syslog(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device, strerror(errno));
+      return -1;
+    }
+
+  device_total_out += packet->len;
+cp
+  return 0;
+}
+
+void dump_device_stats(void)
+{
+cp
+  syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
+  syslog(LOG_DEBUG, _(" total bytes in:  %10d"), device_total_in);
+  syslog(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
+cp
+}