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pcg |
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/* |
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device.c -- raw socket |
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Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>, |
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2002-2003 Guus Sliepen <guus@sliepen.eu.org> |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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$Id: device.c,v 1.1.2.9 2003/07/31 11:31:51 guus Exp $ |
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*/ |
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#include <stdio.h> |
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#include <errno.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <net/if.h> |
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#include <unistd.h> |
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#include <string.h> |
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#include <sys/ioctl.h> |
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#include <sys/socket.h> |
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#include <netpacket/packet.h> |
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#include <net/ethernet.h> |
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#include <utils.h> |
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int device_fd = -1; |
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char *device; |
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char *interface; |
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char ifrname[IFNAMSIZ]; |
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char *device_info; |
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int device_total_in = 0; |
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int device_total_out = 0; |
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bool setup_device(void) |
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{ |
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struct ifreq ifr; |
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struct sockaddr_ll sa; |
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cp(); |
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if(!get_config_string |
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(lookup_config(config_tree, "Interface"), &interface)) |
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interface = "eth0"; |
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if(!get_config_string(lookup_config(config_tree, "Device"), &device)) |
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device = interface; |
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device_info = _("raw socket"); |
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if((device_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0) { |
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logger(LOG_ERR, _("Could not open %s: %s"), device_info, |
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strerror(errno)); |
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return false; |
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} |
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memset(&ifr, 0, sizeof(ifr)); |
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strncpy(ifr.ifr_ifrn.ifrn_name, interface, IFNAMSIZ); |
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if(ioctl(device_fd, SIOCGIFINDEX, &ifr)) { |
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close(device_fd); |
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logger(LOG_ERR, _("Can't find interface %s: %s"), interface, |
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strerror(errno)); |
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return false; |
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} |
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memset(&sa, '0', sizeof(sa)); |
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sa.sll_family = AF_PACKET; |
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sa.sll_protocol = htons(ETH_P_ALL); |
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sa.sll_ifindex = ifr.ifr_ifindex; |
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if(bind(device_fd, (struct sockaddr *) &sa, (socklen_t) sizeof(sa))) { |
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logger(LOG_ERR, _("Could not bind to %s: %s"), device, strerror(errno)); |
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return false; |
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} |
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logger(LOG_INFO, _("%s is a %s"), device, device_info); |
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return true; |
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} |
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void close_device(void) |
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{ |
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cp(); |
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close(device_fd); |
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} |
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bool read_packet(vpn_packet_t *packet) |
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{ |
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int lenin; |
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cp(); |
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if((lenin = read(device_fd, packet->data, MTU)) <= 0) { |
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logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info, |
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device, strerror(errno)); |
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return false; |
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} |
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packet->len = lenin; |
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device_total_in += packet->len; |
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ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len, |
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device_info); |
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return true; |
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} |
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bool write_packet(vpn_packet_t *packet) |
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{ |
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cp(); |
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ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"), |
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packet->len, device_info); |
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if(write(device_fd, packet->data, packet->len) < 0) { |
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logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device, |
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strerror(errno)); |
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return false; |
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} |
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device_total_out += packet->len; |
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return true; |
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} |
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void dump_device_stats(void) |
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{ |
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cp(); |
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logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device); |
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logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in); |
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logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out); |
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} |
