145 lines
3.3 KiB
C
145 lines
3.3 KiB
C
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/*
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VTun - Virtual Tunnel over TCP/IP network.
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Copyright (C) 1998-2000 Maxim Krasnyansky <max_mk@yahoo.com>
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VTun has been derived from VPPP package by Maxim Krasnyansky.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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/*
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* $Id: tap_dev.c,v 1.4.2.1 2007/06/29 05:27:20 mtbishop Exp $
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*/
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#include "config.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <stdarg.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <syslog.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <signal.h>
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#include <stropts.h>
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#include <net/if.h>
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#include <net/if_tun.h>
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_NETINET_IN_SYSTM_H
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#include <netinet/in_systm.h>
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#endif
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#ifdef HAVE_NETINET_IP_H
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#include <netinet/ip.h>
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#endif
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#ifdef HAVE_NETINET_TCP_H
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#include <netinet/tcp.h>
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#endif
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#include "vtun.h"
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#include "lib.h"
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/*
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* Allocate Ether TAP device, returns opened fd.
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* Stores dev name in the first arg(must be large enough).
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*/
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int tap_open(char *dev)
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{
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int tap_fd, if_fd, ppa = -1;
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static int ip_fd = 0;
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char *ptr;
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if( *dev ){
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ptr = dev;
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while( *ptr && !isdigit((int)*ptr) ) ptr++;
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ppa = atoi(ptr);
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}
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/* Check if IP device was opened */
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if( ip_fd )
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close(ip_fd);
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if( (ip_fd = open("/dev/ip", O_RDWR, 0)) < 0){
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syslog(LOG_ERR, "Can't open /dev/ip");
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return -1;
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}
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if( (tap_fd = open("/dev/tap", O_RDWR, 0)) < 0){
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syslog(LOG_ERR, "Can't open /dev/tap");
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return -1;
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}
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/* Assign a new PPA and get its unit number. */
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if( (ppa = ioctl(tap_fd, TUNNEWPPA, ppa)) < 0){
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syslog(LOG_ERR, "Can't assign new interface");
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return -1;
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}
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if( (if_fd = open("/dev/tap", O_RDWR, 0)) < 0){
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syslog(LOG_ERR, "Can't open /dev/tap (2)");
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return -1;
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}
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if(ioctl(if_fd, I_PUSH, "ip") < 0){
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syslog(LOG_ERR, "Can't push IP module");
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return -1;
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}
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/* Assign ppa according to the unit number returned by tap device */
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if(ioctl(if_fd, IF_UNITSEL, (char *)&ppa) < 0){
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syslog(LOG_ERR, "Can't set PPA %d", ppa);
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return -1;
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}
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if(ioctl(ip_fd, I_LINK, if_fd) < 0){
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syslog(LOG_ERR, "Can't link TAP device to IP");
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return -1;
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}
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sprintf(dev, "tap%d", ppa);
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return tap_fd;
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}
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int tap_close(int fd, char *dev)
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{
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return close(fd);
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}
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int tap_write(int fd, char *buf, int len)
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{
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struct strbuf sbuf;
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sbuf.len = len;
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sbuf.buf = buf;
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return putmsg(fd, NULL, &sbuf, 0) >= 0 ? sbuf.len : -1;
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}
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int tap_read(int fd, char *buf, int len)
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{
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struct strbuf sbuf;
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int f = 0;
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sbuf.maxlen = len;
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sbuf.buf = buf;
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return getmsg(fd, NULL, &sbuf, &f) >= 0 ? sbuf.len : -1;
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}
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