Read (and enqueue) packets from interactive input even when we're waiting for a key exchange. This should hopefully fix the situation where "~." doesn't work to terminate a client session when a laptop wakes up. The client will be stuck waiting for a key exchange on a dead connection, so won't have read the escape character

open(IN,"<crypt.ind");
open(OUT,">crypt.ind.tmp");
$a = <IN>;
print OUT  "$a\n\\addcontentsline{toc}{chapter}{Index}\n";
while (<IN>) {
   print OUT $_;
}
close OUT;
close IN;
system("mv -f crypt.ind.tmp crypt.ind");