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tun-device: Avoid opening /dev/tunX multiple times (e.g. on FreeBSD)

This commit is contained in:
Tobias Brunner 2013-06-15 17:46:25 +02:00
parent dcaf8d570c
commit c8a56512a6
1 changed files with 6 additions and 2 deletions
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8
src/libstrongswan/networking/tun_device.c
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@ -390,14 +390,18 @@ static bool init_tun(private_tun_device_t *this, const char *name_tmpl)
/* this works on FreeBSD and might also work on Linux with older TUN
* driver versions (no IFF_TUN) */
char devname[IFNAMSIZ];
int i;
/* the same process is allowed to open a device again, but that's not what
* we want (unless we previously closed a device, which we don't know at
* this point). therefore, this counter is static so we don't accidentally
* open a device twice */
static int i = -1;
if (name_tmpl)
{
DBG1(DBG_LIB, "arbitrary naming of TUN devices is not supported");
}
for (i = 0; i < 256; i++)
for (; ++i < 256; )
{
snprintf(devname, IFNAMSIZ, "/dev/tun%d", i);
this->tunfd = open(devname, O_RDWR);