70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
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/*
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* TUN/TAP driver interface functions
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*
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* Copyright 2004 SYSGO Real-Time Solutions AG
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* Klein-Winternheim, Germany
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* All rights reserved.
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*
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* Author: Armin Schindler <armin.schindler@sysgo.com>
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*
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* $Id$
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <linux/if.h>
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#include <linux/if_tun.h>
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unsigned char dev_name[IFNAMSIZ] = {"isdn%d"};
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int itun_alloc(char *dev, int ether)
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{
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struct ifreq ifr;
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int fd, err;
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if((fd = open("/dev/net/tun", O_RDWR)) >= 0) {
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memset(&ifr, 0, sizeof(ifr));
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/* Flags: IFF_TUN - TUN device (no Ethernet headers, PTP)
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* IFF_TAP - TAP device (with Ethernet headers)
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*
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* IFF_NO_PI - Do not provide packet information
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*/
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ifr.ifr_flags = (ether) ? IFF_TAP : IFF_TUN;
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ifr.ifr_flags |= IFF_NO_PI;
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if (*dev)
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strncpy(ifr.ifr_name, dev, IFNAMSIZ);
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if((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0) {
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close(fd);
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return(err);
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}
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strcpy(dev, ifr.ifr_name);
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}
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return(fd);
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}
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void itun_close(int fd)
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{
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close(fd);
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}
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