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|
#! /usr/local/bin/perl5
# /usr/local/perl5.002/bin/perl
#
#
$debug = 0;
$username = getlogin || (getpwuid($<))[0] ;
# restart_serv = 1 DOES NOT WORK because of bugs in perl.
# (I've worked around this bug below, but it is pretty hideous)
$restart_serv = 0;
$serv_p4 = "/home/MPI/mpich/lib/sun4/ch_p4/serv_p4";
$server_name = "serv_p4";
$run_dir = "$HOME";
$kill_serv = 0;
$rsh = "rsh";
#
use Socket;
#
# This is an experimental perl program to check on your servers
#
# Get the port to check
$portnum=1234;
# Get the list of machines
$machinelist="/home/MPI/mpich/util/machines/machines.sun4";
#
# Read command line for overrides
while ($_ = $ARGV[0]) {
shift;
print "Processing argument $_\n" if $debug;
if ($_ eq "-debug") {
$debug = 1;
}
elsif ($_ eq "-port") {
$portnum = $ARGV[0];
shift;
}
elsif ($_ eq "-startdir") {
$run_dir = $ARGV[0];
shift;
}
elsif ($_ eq "-machinelist") {
$machinelist = $ARGV[0];
shift;
}
elsif ($_ eq "-server") {
$serv_p4 = $ARGV[0];
shift;
}
elsif ($_ eq "-pgm") {
$serv_p4 = "/home/MPI/mpich/lib/sun4/ch_p4/$ARGV[0]";
shift;
}
elsif ($_ eq "-restart") {
$restart_serv = 1;
}
elsif ($_ eq "-user") {
$username = $ARGV[0];
shift;
}
elsif ($_ eq "-kill") {
$kill_serv = 1;
}
else {
print "chkserv [ -port num ] [ -restart ] [ -machinelist file ]";
print " [ -user name ] [ -server pgm ]";
if ($_ eq "-help") { exit 1; }
die "Unrecognized argument $_\n";
}
}
if ($username eq "") {
die "Could not get username!\n";
}
#
# If the program name was just the name without the location, try a
# default location.
if (! -x $serv_p4 ) {
$serv_p4 = "/home/MPI/mpich/lib/sun4/ch_p4/$serv_p4";
}
if (! -x $serv_p4 ) {
die "$serv_p4 is not executable!\n";
}
#
#
open( FLIST, $machinelist ) || die "Could not open $machinelist" ;
# Force output to be flushed
$| = 1;
#
# See perlipc for an example of a tcp client
# Because of bugs in perl, we should really read the file into a perl
# variable (array?) and then operate on that array.
#
# We start in the indicated directory ($HOME by default)
chdir $run_dir ;
#
while (<FLIST>) {
# Skip comment lines
if (/^#/) { next ; }
# Setup socket
$sockaddr = 'S n a4 x8';
chop;
($hostname,$clustersize) = split(/:/);
print "Read $hostname from process $$\n" if $debug;
($name,$aliases,$proto) = getprotobyname('tcp');
# ($name,$aliases,$port) = getservbyname($portnum,'tcp')
# unless $portnum =~/^\d+$/;
$port = $portnum;
($name,$aliases,$type,$len,$thataddr) =
gethostbyname($hostname);
($name,$aliases,$type,$len,$thisaddr) =
gethostbyname('hostname');
$this = pack($sockaddr,AF_INET,0,$thisaddr);
$that = pack($sockaddr,AF_INET,$port,$thataddr);
$hostok = 1;
print "Connecting to $hostname:$port with protocol $proto\n" if $debug;
socket(S,PF_INET,SOCK_STREAM,$proto) || ($hostok = 0);
if ($hostok == 0) { print "socket: $!\n"; next; }
bind(S,$this) || ($hostok = 0);
if ($hostok != 0) {
print "bind: $!\n" if $debug;
connect(S,$that) || ($hostok = 0);
if ($hostok == 0) {
print "connect: $!\n" if $debug; }
}
if ($hostok == 0) {
close( S );
if ($debug) { print "bind: $!\n" }
else {
# This has been hideously painful. perl seems to get confused
# when reading from FLIST when I do a fork; for some reason the
# EOF is lost, along with the first few characters of the input.
# This would have been easier in C, where fork and fgets work
# correctly. I've found documentation on this at
# http://www.perl.com/perl/bugs/NETaa14449-5.html.
# Note that the workaround is to (a) not close files and
# (b) not call exit. Thus, even when doing "norun", we
# have to exec /usr/bin/echo, not use print.
if ($restart_serv) {
print "Restarting server on $hostname:$portnum\n" ;
$cmd = "$rsh $hostname -n $serv_p4 -o -p $portnum";
$pid = fork();
if ($pid > 0) {
waitpid( $pid, 0 );
}
else {
# I am the child
#close( STDIN );
#close( FLIST );
# exec "/usr/bin/echo $cmd\n";
exec $cmd;
exit 1; # just in case exec fails
}
}
else {
print "$hostname:$port needs new server\n"; }
}
next; }
# We need to establish a timeout in case we're not talking to
# who we expect. To make this work, we'd need yet another fork,
# WHICH WON'T WORK FOR THE REASONS ABOVE!
#
$SIG{'ALRM'} = sub {
print "Timeout in connection to $hostname\n" ;
close( S );
};
alarm 20;
# Send request for id or kill
if ($kill_serv) {
$msg = "$username\n$username\n%exit\n";
}
else {
$msg = "$username\n$username\n%id\n";
}
$datalen = length $msg;
syswrite S,$msg,$datalen;
if ($debug) {
while (<S>) { print $_; }
}
else {
$msg = <S>;
if ($msg ne "Proceed\n") { print "Bad message from $hostname: $msg";}
if ($kill_serv != 1) {
$msg = <S>;
if ($msg eq
"Port $port for client $username and server user $username\n") {
print "$hostname:$port has valid server\n";
}
}
}
close(S);
alarm 0;
}
close( FLIST );
0;
|
