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#! /usr/bin/perl
# $Header: gsh,v 3.0.1.2 90/03/12 16:34:11 lwall Locked $
# Do rsh globally--see man page
$SIG{'QUIT'} = 'quit'; # install signal handler for SIGQUIT
sub getswitches {
while ($ARGV[0] =~ /^-/) { # parse switches
$ARGV[0] =~ /^-h/ && ($showhost++,$silent++,shift(@ARGV),next);
$ARGV[0] =~ /^-s/ && ($silent++,shift(@ARGV),next);
$ARGV[0] =~ /^-d/ && ($dodist++,shift(@ARGV),next);
$ARGV[0] =~ /^-n/ && ($n=' -n',shift(@ARGV),next);
$ARGV[0] =~ /^-l/ && ($l=' -l ' . $ARGV[1],shift(@ARGV),shift(@ARGV),
next);
last;
}
}
do getswitches(); # get any switches before class
$systype = shift; # get name representing set of hosts
do getswitches(); # same switches allowed after class
if ($dodist) { # distribute input over all rshes?
`cat >/tmp/gsh$$`; # get input into a handy place
$dist = " </tmp/gsh$$"; # each rsh takes input from there
}
$cmd = join(' ',@ARGV); # remaining args constitute the command
$cmd =~ s/'/'"'"'/g; # quote any embedded single quotes
$one_of_these = ":$systype:"; # prepare to expand "macros"
$one_of_these =~ s/\+/:/g; # we hope to end up with list of
$one_of_these =~ s/-/:-/g; # colon separated attributes
@ARGV = ();
push(@ARGV,'.grem') if -f '.grem';
push(@ARGV,'.ghosts') if -f '.ghosts';
push(@ARGV,'/etc/ghosts');
$remainder = '';
line: while (<>) { # for each line of ghosts
s/[ \t]*\n//; # trim trailing whitespace
if (!$_ || /^#/) { # skip blank line or comment
next line;
}
if (/^(\w+)=(.+)/) { # a macro line?
$name = $1; $repl = $2;
$repl =~ s/\+/:/g;
$repl =~ s/-/:-/g;
$one_of_these =~ s/:$name:/:$repl:/; # do expansion in "wanted" list
$repl =~ s/:/:-/g;
$one_of_these =~ s/:-$name:/:-$repl:/;
next line;
}
# we have a normal line
@attr = split(' '); # a list of attributes to match against
# which we put into an array
$host = $attr[0]; # the first attribute is the host name
if ($showhost) {
$showhost = "$host:\t";
}
$wanted = 0;
foreach $attr (@attr) { # iterate over attribute array
$wanted++ if index($one_of_these,":$attr:") >= 0;
$wanted = -9999 if index($one_of_these,":-$attr:") >= 0;
}
if ($wanted > 0) {
print "rsh $host$l$n '$cmd'\n" unless $silent;
$SIG{'INT'} = 'DEFAULT';
if (open(PIPE,"rsh $host$l$n '$cmd'$dist 2>&1|")) { # start an rsh
$SIG{'INT'} = 'cont';
for ($iter=0; <PIPE>; $iter++) {
unless ($iter) {
$remainder .= "$host+"
if /Connection timed out|Permission denied/;
}
print $showhost,$_;
}
close(PIPE);
} else {
print "(Can't execute rsh: $!)\n";
$SIG{'INT'} = 'cont';
}
}
}
unlink "/tmp/gsh$$" if $dodist;
if ($remainder) {
chop($remainder);
open(grem,">.grem") || (printf stderr "Can't make a .grem file: $!\n");
print grem 'rem=', $remainder, "\n";
close(grem);
print 'rem=', $remainder, "\n";
}
# here are a couple of subroutines that serve as signal handlers
sub cont {
print "\rContinuing...\n";
$remainder .= "$host+";
}
sub quit {
$| = 1;
print "\r";
$SIG{'INT'} = '';
kill 2, $$;
}
|
