/*
device.c -- Interaction with Linux ethertap and tun/tap device
Copyright (C) 2001-2005 Ivo Timmermans,
- 2001-2013 Guus Sliepen <guus@tinc-vpn.org>
+ 2001-2014 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
#include "../device.h"
#include "../logger.h"
#include "../names.h"
-#include "../net.h"
#include "../route.h"
-#include "../utils.h"
#include "../xalloc.h"
-#include "../device.h"
typedef enum device_type_t {
DEVICE_TYPE_TUN,
char *iface = NULL;
static char *type = NULL;
static char ifrname[IFNAMSIZ];
-static char *device_info;
+static const char *device_info;
static bool setup_device(void) {
- if(!get_config_string(lookup_config(config_tree, "Device"), &device))
+ if(!get_config_string(lookup_config(&config_tree, "Device"), &device)) {
device = xstrdup(DEFAULT_DEVICE);
+ }
- if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
- if(netname)
+ if(!get_config_string(lookup_config(&config_tree, "Interface"), &iface))
+ if(netname) {
iface = xstrdup(netname);
+ }
device_fd = open(device, O_RDWR | O_NONBLOCK);
fcntl(device_fd, F_SETFD, FD_CLOEXEC);
#endif
- struct ifreq ifr = {{{0}}};
+ struct ifreq ifr = {0};
- get_config_string(lookup_config(config_tree, "DeviceType"), &type);
+ get_config_string(lookup_config(&config_tree, "DeviceType"), &type);
if(type && strcasecmp(type, "tun") && strcasecmp(type, "tap")) {
logger(DEBUG_ALWAYS, LOG_ERR, "Unknown device type %s!", type);
device_type = DEVICE_TYPE_TUN;
device_info = "Linux tun/tap device (tun mode)";
} else {
- if (routing_mode == RMODE_ROUTER)
+ if(routing_mode == RMODE_ROUTER) {
overwrite_mac = true;
+ }
+
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
device_type = DEVICE_TYPE_TAP;
device_info = "Linux tun/tap device (tap mode)";
/* Set IFF_ONE_QUEUE flag... */
bool t1q = false;
- if(get_config_bool(lookup_config(config_tree, "IffOneQueue"), &t1q) && t1q)
+
+ if(get_config_bool(lookup_config(&config_tree, "IffOneQueue"), &t1q) && t1q) {
ifr.ifr_flags |= IFF_ONE_QUEUE;
+ }
+
#endif
- if(iface)
+ if(iface) {
strncpy(ifr.ifr_name, iface, IFNAMSIZ);
+ ifr.ifr_name[IFNAMSIZ - 1] = 0;
+ }
if(!ioctl(device_fd, TUNSETIFF, &ifr)) {
strncpy(ifrname, ifr.ifr_name, IFNAMSIZ);
+ ifrname[IFNAMSIZ - 1] = 0;
free(iface);
iface = xstrdup(ifrname);
+ } else {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Could not create a tun/tap interface from %s: %s", device, strerror(errno));
+ return false;
}
logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
if(ifr.ifr_flags & IFF_TAP) {
- struct ifreq ifr_mac = {};
- if(!ioctl(device_fd, SIOCGIFHWADDR, &ifr_mac))
+ struct ifreq ifr_mac = {0};
+
+ if(!ioctl(device_fd, SIOCGIFHWADDR, &ifr_mac)) {
memcpy(mymac.x, ifr_mac.ifr_hwaddr.sa_data, ETH_ALEN);
- else
+ } else {
logger(DEBUG_ALWAYS, LOG_WARNING, "Could not get MAC address of %s: %s", device, strerror(errno));
+ }
}
return true;
close(device_fd);
device_fd = -1;
- free(type); type = NULL;
- free(device); device = NULL;
- free(iface); iface = NULL;
+ free(type);
+ type = NULL;
+ free(device);
+ device = NULL;
+ free(iface);
+ iface = NULL;
device_info = NULL;
}
static bool read_packet(vpn_packet_t *packet) {
- int inlen;
+ ssize_t inlen;
switch(device_type) {
- case DEVICE_TYPE_TUN:
- inlen = read(device_fd, packet->data + 10, MTU - 10);
+ case DEVICE_TYPE_TUN:
+ inlen = read(device_fd, DATA(packet) + 10, MTU - 10);
+
+ if(inlen <= 0) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s",
+ device_info, device, strerror(errno));
- if(inlen <= 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s",
- device_info, device, strerror(errno));
- return false;
+ if(errno == EBADFD) { /* File descriptor in bad state */
+ event_exit();
}
- memset(packet->data, 0, 12);
- packet->len = inlen + 10;
- break;
- case DEVICE_TYPE_TAP:
- inlen = read(device_fd, packet->data, MTU);
+ return false;
+ }
- if(inlen <= 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s",
- device_info, device, strerror(errno));
- return false;
- }
+ memset(DATA(packet), 0, 12);
+ packet->len = inlen + 10;
+ break;
+
+ case DEVICE_TYPE_TAP:
+ inlen = read(device_fd, DATA(packet), MTU);
+
+ if(inlen <= 0) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s",
+ device_info, device, strerror(errno));
+ return false;
+ }
- packet->len = inlen;
- break;
- default:
- abort();
+ packet->len = inlen;
+ break;
+
+ default:
+ abort();
}
logger(DEBUG_TRAFFIC, LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
- device_info);
+ device_info);
return true;
}
static bool write_packet(vpn_packet_t *packet) {
logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s",
- packet->len, device_info);
+ packet->len, device_info);
switch(device_type) {
- case DEVICE_TYPE_TUN:
- packet->data[10] = packet->data[11] = 0;
- if(write(device_fd, packet->data + 10, packet->len - 10) < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device,
- strerror(errno));
- return false;
- }
- break;
- case DEVICE_TYPE_TAP:
- if(write(device_fd, packet->data, packet->len) < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device,
- strerror(errno));
- return false;
- }
- break;
- default:
- abort();
+ case DEVICE_TYPE_TUN:
+ DATA(packet)[10] = DATA(packet)[11] = 0;
+
+ if(write(device_fd, DATA(packet) + 10, packet->len - 10) < 0) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device,
+ strerror(errno));
+ return false;
+ }
+
+ break;
+
+ case DEVICE_TYPE_TAP:
+ if(write(device_fd, DATA(packet), packet->len) < 0) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device,
+ strerror(errno));
+ return false;
+ }
+
+ break;
+
+ default:
+ abort();
}
return true;