#!/bin/bash
# Copyright (C) 2000  Tim Waugh <twaugh@redhat.com>
# Licensed under the terms of the GNU General Public License v2
if [ "$1" = "--version" ]; then
  echo "Poor man's telnet 0.0.2"; exit 0
fi

if [ "$1" = "--help" ]; then
  echo "Poor man's telnet: a simple telnet client written in bash."
  echo "usage: pmt <host> <port>"
  echo "This only really works for SMTP-style connections."
  exit 0
fi

if [ -z $1 ]; then
  echo "Need hostname"; exit 1
fi

if [ -z $2 ]; then
  echo "Need port"; exit 1
fi

port=$2
if [ ! -z "${2##[0-9]*}" ]
then
  port=$( (while read line; do
      line=${line#$2}
      line=$(echo ${line%%/tcp*})
      if [ ! -z "$line" ]; then
        if [ -z "${line##[0-9]*}" ]; then
          echo $line
          break
        fi
      fi
    done
  ) < /etc/services)
fi

( while :; do
    while :; do
      read line <&3 || exit 0
      echo "$line"
      if [ ! -z "${line##???-*}" ]; then break; fi
    done
    read line; echo "$line" >&3
  done
) 3<>/dev/tcp/$1/$port