6b92ac505d
The offset value indicates where the actual payload starts, so we can process both legacy and SPTPS UDP packets without having to do casting tricks and/or moving memory around.
143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/*
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device.c -- raw socket
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Copyright (C) 2002-2005 Ivo Timmermans,
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2002-2012 Guus Sliepen <guus@tinc-vpn.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 along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "system.h"
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#ifdef HAVE_NETPACKET_PACKET_H
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#include <netpacket/packet.h>
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#endif
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#include "conf.h"
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#include "device.h"
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#include "net.h"
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#include "logger.h"
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#include "utils.h"
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#include "route.h"
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#include "xalloc.h"
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#if defined(PF_PACKET) && defined(ETH_P_ALL) && defined(AF_PACKET) && defined(SIOCGIFINDEX)
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static char *device_info;
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static bool setup_device(void) {
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struct ifreq ifr;
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struct sockaddr_ll sa;
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if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
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iface = xstrdup("eth0");
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if(!get_config_string(lookup_config(config_tree, "Device"), &device))
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device = xstrdup(iface);
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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(DEBUG_ALWAYS, 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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#ifdef FD_CLOEXEC
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fcntl(device_fd, F_SETFD, FD_CLOEXEC);
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#endif
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strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
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if(ioctl(device_fd, SIOCGIFINDEX, &ifr)) {
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close(device_fd);
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logger(DEBUG_ALWAYS, LOG_ERR, "Can't find interface %s: %s", iface,
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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(DEBUG_ALWAYS, LOG_ERR, "Could not bind %s to %s: %s", device, iface, strerror(errno));
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return false;
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}
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logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
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return true;
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}
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static void close_device(void) {
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close(device_fd); device_fd = -1;
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free(device); device = NULL;
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free(iface); iface = NULL;
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device_info = NULL;
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}
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static bool read_packet(vpn_packet_t *packet) {
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int inlen;
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if((inlen = read(device_fd, DATA(packet), MTU)) <= 0) {
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logger(DEBUG_ALWAYS, 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 = inlen;
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logger(DEBUG_TRAFFIC, 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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static bool write_packet(vpn_packet_t *packet) {
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logger(DEBUG_TRAFFIC, 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, DATA(packet), packet->len) < 0) {
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logger(DEBUG_ALWAYS, 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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return true;
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}
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const devops_t raw_socket_devops = {
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.setup = setup_device,
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.close = close_device,
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.read = read_packet,
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.write = write_packet,
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};
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#else
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static bool not_supported(void) {
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logger(DEBUG_ALWAYS, LOG_ERR, "Raw socket device not supported on this platform");
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return false;
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}
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const devops_t raw_socket_devops = {
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.setup = not_supported,
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.close = NULL,
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.read = NULL,
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.write = NULL,
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};
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#endif
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