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authorChristian Pointner <equinox@anytun.org>2008-12-27 15:20:28 +0000
committerChristian Pointner <equinox@anytun.org>2008-12-27 15:20:28 +0000
commit3f9fa03e027ef6db9ae7f8f5815a16e6ad6dd66c (patch)
treee98d80378768c33531b1eab71c14a185b940e0b9 /src/linux/tun.c
parentadded empty tun.c and h (diff)
added first version of tun device (needs furhter testing)
Diffstat (limited to 'src/linux/tun.c')
-rw-r--r--src/linux/tun.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/src/linux/tun.c b/src/linux/tun.c
index 971f344..005f125 100644
--- a/src/linux/tun.c
+++ b/src/linux/tun.c
@@ -33,3 +33,159 @@
*/
#include "tun.h"
+
+#include "tun_helper.h"
+
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <net/if.h>
+#include <linux/ip.h>
+#include <linux/if_ether.h>
+#include <linux/if_tun.h>
+#define DEFAULT_DEVICE "/dev/net/tun"
+
+#include "log.h"
+
+void tun_init(tun_device_t** dev, const char* dev_name, const char* dev_type, const char* ifcfg_lp, const char* ifcfg_rnmp)
+{
+ if(!dev) return;
+
+ *dev = malloc(sizeof(tun_device_t));
+ if(!*dev) return;
+
+ tun_conf(*dev, dev_name, dev_type, ifcfg_lp, ifcfg_rnmp, 1400);
+
+ (*dev)->fd_ = open(DEFAULT_DEVICE, O_RDWR);
+ if((*dev)->fd_ < 0) {
+ log_printf(ERR, "can't open device file (%s): %m", DEFAULT_DEVICE);
+ free(*dev);
+ *dev = NULL;
+ return;
+ }
+
+ struct ifreq ifr;
+ memset(&ifr, 0, sizeof(ifr));
+
+ if((*dev)->type_ == TYPE_TUN) {
+ ifr.ifr_flags = IFF_TUN;
+ (*dev)->with_pi_ = 1;
+ }
+ else if((*dev)->type_ == TYPE_TAP) {
+ ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+ (*dev)->with_pi_ = 0;
+ }
+ else {
+ log_printf(ERR, "unable to recognize type of device (tun or tap)");
+ free(*dev);
+ *dev = NULL;
+ return;
+ }
+
+ if(dev_name)
+ strncpy(ifr.ifr_name, dev_name, IFNAMSIZ);
+
+ if(!ioctl((*dev)->fd_, TUNSETIFF, &ifr)) {
+ (*dev)->actual_name_ = strdup(ifr.ifr_name);
+ } else if(!ioctl((*dev)->fd_, (('T' << 8) | 202), &ifr)) {
+ (*dev)->actual_name_ = strdup(ifr.ifr_name);
+ } else {
+ log_printf(ERR, "tun/tap device ioctl failed: %m");
+ free(*dev);
+ *dev = NULL;
+ return;
+ }
+
+ if(ifcfg_lp && ifcfg_rnmp)
+ tun_do_ifconfig(*dev);
+}
+
+void tun_init_post(tun_device_t* dev)
+{
+// nothing yet
+}
+
+void tun_close(tun_device_t** dev)
+{
+ if(!dev || !(*dev))
+ return;
+
+ if((*dev)->fd_ > 0)
+ close((*dev)->fd_);
+
+ free(*dev);
+ *dev = NULL;
+}
+
+int tun_read(tun_device_t* dev, u_int8_t* buf, u_int32_t len)
+{
+ if(!dev || dev->fd_ < 0)
+ return -1;
+
+ if(dev->with_pi_)
+ {
+ struct iovec iov[2];
+ struct tun_pi tpi;
+
+ iov[0].iov_base = &tpi;
+ iov[0].iov_len = sizeof(tpi);
+ iov[1].iov_base = buf;
+ iov[1].iov_len = len;
+ return(tun_fix_return(readv(dev->fd_, iov, 2), sizeof(tpi)));
+ }
+ else
+ return(read(dev->fd_, buf, len));
+}
+
+int tun_write(tun_device_t* dev, u_int8_t* buf, u_int32_t len)
+{
+ if(!dev || dev->fd_ < 0)
+ return -1;
+
+ if(dev->with_pi_)
+ {
+ struct iovec iov[2];
+ struct tun_pi tpi;
+ struct iphdr *hdr = (struct iphdr *)buf;
+
+ tpi.flags = 0;
+ if(hdr->version == 4)
+ tpi.proto = htons(ETH_P_IP);
+ else
+ tpi.proto = htons(ETH_P_IPV6);
+
+ iov[0].iov_base = &tpi;
+ iov[0].iov_len = sizeof(tpi);
+ iov[1].iov_base = buf;
+ iov[1].iov_len = len;
+ return(tun_fix_return(writev(dev->fd_, iov, 2), sizeof(tpi)));
+ }
+ else
+ return(write(dev->fd_, buf, len));
+}
+
+void tun_do_ifconfig(tun_device_t* dev)
+{
+ if(!dev)
+ return;
+
+ char* command = NULL;
+ if(dev->type_ == TYPE_TUN)
+ asprintf(&command, "/sbin/ifconfig %s %s pointopoint %s mtu %d" , dev->actual_name_, dev->local_, dev->remote_netmask_, dev->mtu_);
+ else
+ asprintf(&command, "/sbin/ifconfig %s %s netmask %s mtu %d" , dev->actual_name_, dev->local_, dev->remote_netmask_, dev->mtu_);
+
+ if(!command) {
+ log_printf(ERR, "Execution of ifconfig failed");
+ return;
+ }
+
+ int result = system(command);
+ if(result == -1)
+ log_printf(ERR, "Execution of ifconfig failed");
+ else
+ log_printf(NOTICE, "ifconfig returned %d", WEXITSTATUS(result));
+}