mdw@git.distorted.org.uk Git - unet/blob - tests/vpn.ssh

   1 #! /bin/perl
   2
   3 use Socket;
   4
   5 # --- Read the network interface to steal ---
   6
   7 $netif = shift;
   8
   9 # --- Start a child if so requested ---
  10
  11 if (@ARGV) {
  12   socketpair(ONE, TOTHER, PF_UNIX, SOCK_STREAM, 0)
  13     or die "socketpair: $!";
  14   $kid = fork();
  15   defined $kid or die "fork: $!";
  16   if ($kid) {
  17     close ONE;
  18     open STDIN, ">&TOTHER" or die "dup stdin: $!";
  19     open STDOUT, ">&TOTHER" or die "dup stdout: $!";
  20     close TOTHER;
  21     exec @ARGV;
  22     die "exec: $!";
  23   }
  24   close TOTHER;
  25   open STDIN, ">&ONE" or die "dup stdin: $!";
  26   open STDOUT, ">&ONE" or die "dup stdout: $!";
  27   close ONE;
  28 }
  29
  30 # --- Now start work on this ---
  31
  32 open NETIF, "+> $netif" or die "open($netif): $!";
  33
  34 for (;;) {
  35   $rfd = '';
  36   vec($rfd, fileno(STDIN), 1) = 1;
  37   vec($rfd, fileno(NETIF), 1) = 1;
  38   select($rfd, undef, undef, undef) or die "select: $!";
  39
  40   if (vec($rfd, fileno(NETIF), 1)) {
  41     sysread(NETIF, $pkt, 65536);
  42     $pkt = pack("n", length($pkt)) . $pkt;
  43     syswrite(STDOUT, $pkt, length($pkt));
  44   }
  45   if (vec($rfd, fileno(STDIN), 1)) {
  46     sysread(STDIN, $clen, 2) or die "tunnel has vanished: $!";
  47     $len = unpack("n", $clen);
  48     sysread(STDIN, $pkt, $len);
  49     syswrite(NETIF, $pkt, length($pkt));
  50   }
  51 }