Allow linking with multiple device drivers.

[tinc] / src / raw_socket_device.c

diff --git a/src/raw_socket_device.c b/src/raw_socket_device.c
new file mode 100644 (file)
index 0000000..90ccedf
--- /dev/null
+++ b/src/raw_socket_device.c
@@ -0,0 +1,133 @@
+/*
+    device.c -- raw socket
+    Copyright (C) 2002-2005 Ivo Timmermans,
+                  2002-2011 Guus Sliepen <guus@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.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "system.h"
+
+#include <netpacket/packet.h>
+
+#include "conf.h"
+#include "device.h"
+#include "net.h"
+#include "logger.h"
+#include "utils.h"
+#include "route.h"
+#include "xalloc.h"
+
+static char *device_info;
+
+static uint64_t device_total_in = 0;
+static uint64_t device_total_out = 0;
+
+static bool setup_device(void) {
+       struct ifreq ifr;
+       struct sockaddr_ll sa;
+
+       if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
+               iface = xstrdup("eth0");
+
+       if(!get_config_string(lookup_config(config_tree, "Device"), &device))
+               device = xstrdup(iface);
+
+       device_info = "raw socket";
+
+       if((device_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0) {
+               logger(LOG_ERR, "Could not open %s: %s", device_info,
+                          strerror(errno));
+               return false;
+       }
+
+       memset(&ifr, 0, sizeof(ifr));
+       strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
+       if(ioctl(device_fd, SIOCGIFINDEX, &ifr)) {
+               close(device_fd);
+               logger(LOG_ERR, "Can't find interface %s: %s", iface,
+                          strerror(errno));
+               return false;
+       }
+
+       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))) {
+               logger(LOG_ERR, "Could not bind %s to %s: %s", device, iface, strerror(errno));
+               return false;
+       }
+
+       logger(LOG_INFO, "%s is a %s", device, device_info);
+
+       return true;
+}
+
+static void close_device(void) {
+       close(device_fd);
+
+       free(device);
+       free(iface);
+}
+
+static bool read_packet(vpn_packet_t *packet) {
+       int lenin;
+
+       if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
+               logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
+                          device, strerror(errno));
+               return false;
+       }
+
+       packet->len = lenin;
+
+       device_total_in += packet->len;
+
+       ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
+                          device_info);
+
+       return true;
+}
+
+static bool write_packet(vpn_packet_t *packet) {
+       ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
+                          packet->len, device_info);
+
+       if(write(device_fd, packet->data, packet->len) < 0) {
+               logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device,
+                          strerror(errno));
+               return false;
+       }
+
+       device_total_out += packet->len;
+
+       return true;
+}
+
+static void dump_device_stats(void) {
+       logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
+       logger(LOG_DEBUG, " total bytes in:  %10"PRIu64, device_total_in);
+       logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
+}
+
+const devops_t raw_socket_devops = {
+       .setup = setup_device,
+       .close = close_device,
+       .read = read_packet,
+       .write = write_packet,
+       .dump_stats = dump_device_stats,
+};