/* vim: set expandtab ts=4 sw=4: */
/*
* You may redistribute this program and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation,
* either version 3 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, see .
*/
#include "exception/Except.h"
#include "interface/Interface.h"
#include "interface/TUNConfigurator.h"
#include "util/Bits.h"
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/* Tun Configurator for OpenBSD. */
struct Interface* TUNInterface_new(const char* interfaceName,
char assignedInterfaceName[TUNInterface_IFNAMSIZ],
struct EventBase* base,
struct Log* logger,
struct Except* eh,
struct Allocator* alloc)
{
// to store the tunnel device index
int ppa = 0;
// Open the descriptor
int tunFd = open("/dev/tun0", O_RDWR);
if (tunFd == -1) {
tunFd = open("/dev/tun1", O_RDWR);
ppa = 1;
}
if (tunFd == -1) {
tunFd = open("/dev/tun2", O_RDWR);
ppa = 2;
}
if (tunFd == -1) {
tunFd = open("/dev/tun3", O_RDWR);
ppa = 3;
}
if (tunFd < 0 ) {
int err = errno;
close(tunFd);
char* error = NULL;
if (tunFd < 0) {
error = "open(\"/dev/tunX\")";
}
Except_raise(eh, TUNConfigurator_initTun_INTERNAL, error, strerror(err));
}
// Since devices are numbered rather than named, it's not possible to have tun0 and cjdns0
// so we'll skip the pretty names and call everything tunX
snprintf(assignedInterfaceName, TUNConfigurator_IFNAMSIZ, "tun%d", ppa);
char* error = NULL;
if (error) {
int err = errno;
close(tunFd);
Except_raise(eh, TUNConfigurator_initTun_INTERNAL, "%s [%s]", error, strerror(err));
}
struct Pipe* p = Pipe_forFiles(tunFd, tunFd, base, eh, alloc);
return BSDMessageTypeWrapper_new(&p->iface, logger);
}