74 lines
1.4 KiB
C
74 lines
1.4 KiB
C
/*
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* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <linux/if.h>
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#include <linux/if_tun.h>
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static int
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tun_alloc(char *dev)
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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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printf ("Error opening /dev/net/tun: %s\n", strerror (errno));
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return -1;
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}
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memset (&ifr, 0, sizeof (ifr));
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/* Flags: IFF_TUN - TUN device (no Ethernet headers)
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* IFF_TAP - TAP device
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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 = IFF_TAP;
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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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printf ("Error calling TUNSETIFF: %s\n", strerror (errno));
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close (fd);
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return err;
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}
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strncpy (dev, ifr.ifr_name, IFNAMSIZ);
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return fd;
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}
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int
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main (int argc, const char *argv[])
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{
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int fd;
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char namebuf[IFNAMSIZ];
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strcpy (namebuf, "pseudo-modem%d");
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fd = tun_alloc (namebuf);
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if (fd == -1)
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exit (1);
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printf ("%s\n", namebuf);
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fflush(stdout);
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while (1)
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sleep (3600);
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return 0;
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}
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