From 18948c5784bfedf0dd5a371e41bc2cceee76d92e Mon Sep 17 00:00:00 2001 From: Guus Sliepen Date: Thu, 18 Jul 2002 14:30:45 +0000 Subject: [PATCH] Added support for raw sockets. This can be used instead of tun/tap devices. --- src/raw_socket/device.c | 174 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 174 insertions(+) create mode 100644 src/raw_socket/device.c 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 , + 2002 Guus Sliepen + + 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#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 +} -- 2.20.1