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Full Discussion: extremely headache
Top Forums UNIX for Dummies Questions & Answers extremely headache Post 1895 by mib on Thursday 5th of April 2001 09:16:52 AM
Old 04-05-2001
Glad to know your problem is over. Smilie here is the perl script.

#inetd listens for rexec requests via TCP connections on port 512.
# rexec format: The input stream consists of null separated values. port for standard error\0username\0password\0command and args\0

use Socket;

($host, $user, $passwd, $command)=@ARGV;

$sockaddr = 'S n a4 x8';
($name, $aliases, $proto) = getprotobyname('tcp');
($name, $aliases, $type, $len, $thisaddr) = gethostbyname($host);
$thisport = pack($sockaddr, &AF_INET, 0, $thisaddr);
$thatport = pack($sockaddr, &AF_INET, $port, $thisaddr);

socket(S, &PF_INET, &SOCK_STREAM, $proto) || die "cannot create socket. Reason: $!\n";
connect(S,$thatport) || die "cannot connect socket. Reason: $!\n";

select(S); $| = 1; select(STDOUT);     # Set socket to write after each print
printf S "0\0%s\0%s\0%s\0",$user,$passwd,$command;     # Send command

# Read responses from server
while ( $_ = <S> ) {
printf ("$_");

#end of code

besides using Socket module,you can use object-oriented IO::Socket module.(http://search.cpan.org)

the most easiest way is to grab Net::Rexec module from cpan.org. then this two line code will do the rest. This module also supports .netrc file.(You need IO::Socket, Net::Netrc modules)
use Net::Rexec 'rexec';
($rc, @output) = rexec(host, command, userid, password);


[Edited by mib on 04-05-2001 at 09:39 AM]

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IO::Socket::INET(3pm)					 Perl Programmers Reference Guide				     IO::Socket::INET(3pm)

IO::Socket::INET - Object interface for AF_INET domain sockets SYNOPSIS
"IO::Socket::INET" provides an object interface to creating and using sockets in the AF_INET domain. It is built upon the IO::Socket interface and inherits all the methods defined by IO::Socket. CONSTRUCTOR
new ( [ARGS] ) Creates an "IO::Socket::INET" object, which is a reference to a newly created symbol (see the "Symbol" package). "new" optionally takes arguments, these arguments are in key-value pairs. In addition to the key-value pairs accepted by IO::Socket, "IO::Socket::INET" provides. PeerAddr Remote host address <hostname>[:<port>] PeerHost Synonym for PeerAddr PeerPort Remote port or service <service>[(<no>)] | <no> LocalAddr Local host bind address hostname[:port] LocalHost Synonym for LocalAddr LocalPort Local host bind port <service>[(<no>)] | <no> Proto Protocol name (or number) "tcp" | "udp" | ... Type Socket type SOCK_STREAM | SOCK_DGRAM | ... Listen Queue size for listen ReuseAddr Set SO_REUSEADDR before binding Reuse Set SO_REUSEADDR before binding (deprecated, prefer ReuseAddr) ReusePort Set SO_REUSEPORT before binding Broadcast Set SO_BROADCAST before binding Timeout Timeout value for various operations MultiHomed Try all addresses for multi-homed hosts Blocking Determine if connection will be blocking mode If "Listen" is defined then a listen socket is created, else if the socket type, which is derived from the protocol, is SOCK_STREAM then connect() is called. Although it is not illegal, the use of "MultiHomed" on a socket which is in non-blocking mode is of little use. This is because the first connect will never fail with a timeout as the connect call will not block. The "PeerAddr" can be a hostname or the IP-address on the "xx.xx.xx.xx" form. The "PeerPort" can be a number or a symbolic service name. The service name might be followed by a number in parenthesis which is used if the service is not known by the system. The "PeerPort" specification can also be embedded in the "PeerAddr" by preceding it with a ":". If "Proto" is not given and you specify a symbolic "PeerPort" port, then the constructor will try to derive "Proto" from the service name. As a last resort "Proto" "tcp" is assumed. The "Type" parameter will be deduced from "Proto" if not specified. If the constructor is only passed a single argument, it is assumed to be a "PeerAddr" specification. If "Blocking" is set to 0, the connection will be in nonblocking mode. If not specified it defaults to 1 (blocking mode). Examples: $sock = IO::Socket::INET->new(PeerAddr => 'www.perl.org', PeerPort => 'http(80)', Proto => 'tcp'); $sock = IO::Socket::INET->new(PeerAddr => 'localhost:smtp(25)'); $sock = IO::Socket::INET->new(Listen => 5, LocalAddr => 'localhost', LocalPort => 9000, Proto => 'tcp'); $sock = IO::Socket::INET->new(''); $sock = IO::Socket::INET->new( PeerPort => 9999, PeerAddr => inet_ntoa(INADDR_BROADCAST), Proto => udp, LocalAddr => 'localhost', Broadcast => 1 ) or die "Can't bind : $@ "; NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE As of VERSION 1.18 all IO::Socket objects have autoflush turned on by default. This was not the case with earlier releases. NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE METHODS sockaddr () Return the address part of the sockaddr structure for the socket sockport () Return the port number that the socket is using on the local host sockhost () Return the address part of the sockaddr structure for the socket in a text form xx.xx.xx.xx peeraddr () Return the address part of the sockaddr structure for the socket on the peer host peerport () Return the port number for the socket on the peer host. peerhost () Return the address part of the sockaddr structure for the socket on the peer host in a text form xx.xx.xx.xx SEE ALSO
Socket, IO::Socket AUTHOR
Graham Barr. Currently maintained by the Perl Porters. Please report all bugs to <perlbug@perl.org>. COPYRIGHT
Copyright (c) 1996-8 Graham Barr <gbarr@pobox.com>. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.16.2 2012-10-11 IO::Socket::INET(3pm)

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