linuxstreams/wvtundev.cc

   1 /*
   2  * Worldvisions Weaver Software:
   3  *   Copyright (C) 1997-2002 Net Integration Technologies, Inc.
   4  *
   5  * WvTunDev provides a convenient way of using Linux tunnel devices.
   6  *
   7  * If you don't have the /dev/net/tun device, try doing:
   8  *          mknod /dev/net/tun c 10 200
   9  */
  10 #include <sys/ioctl.h>
  11 #include <sys/socket.h>
  12 #include "if_tun.h"
  13 #include <string.h>
  14
  15 #include "wvlog.h"
  16 #include "wvtundev.h"
  17
  18 WvTunDev::WvTunDev(const WvIPNet &addr, int mtu) :
  19     WvFile("/dev/net/tun", O_RDWR)
  20 {
  21     init(addr, mtu);
  22 }
  23
  24 void WvTunDev::init(const WvIPNet &addr, int mtu)
  25 {
  26     WvLog log("New tundev", WvLog::Debug2);
  27     if (getfd() < 0)
  28     {
  29         log("Could not open /dev/net/tun: %s\n", strerror(errno));
  30         seterr(errno);
  31         return;
  32     }
  33
  34     struct ifreq ifr;
  35     memset(&ifr, 0, sizeof(ifr));
  36     ifr.ifr_flags = IFF_NO_PI | IFF_TUN;
  37
  38     if (ioctl(getfd(), TUNSETIFF, (void *) &ifr) < 0 ||
  39         ioctl(getfd(), TUNSETNOCSUM, 1) < 0)
  40     {
  41         log("Could not initialize the interface: %s\n", strerror(errno));
  42         seterr(errno);
  43         return;
  44     }
  45
  46     WvInterface iface(ifr.ifr_name);
  47     iface.setipaddr(addr);
  48     iface.setmtu(mtu);
  49     iface.up(true);
  50     ifcname = ifr.ifr_name;
  51     log.app = ifcname;
  52
  53     log(WvLog::Debug2, "Now up (%s).\n", addr);
  54 }