ttycopy

#!/bin/bash

tty=$1

function example(){
cat << EXAMPLE

Type "w" to find tty:

  [root@localhost ~]$ w
   20:32:24 up 3 days, 19:45,  4 users,  load average: 0.00, 0.01, 0.05
  USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
  root     pts/0    tty.sample.com     16:12    7:52   0.38s  0.38s w
  huga     pts/1    test.for           16:12   23:52   1.16s  0.00s less -s
  John     pts/3    aaa.jp             20:11   20:24   0.04s  0.04s -bash
  dai001   pts/4    localhost          20:14    0.00s  0.08s  0.01s -bash

If you want to scan tty of USER dai001, type:

  [root@host root]# ./ttycopy pts/4

EXAMPLE
}

if [ `id -u` -ne 0 ]; then
  echo -ne "[ERROR] You must be root.\n"
  exit 1
fi

if [ $# -ne 1 ]; then
  echo -ne "[ERROR] Invalid number of arguments.\n"
  example
  exit 1
fi

if [ ! -e "/dev/${tty}" ] || \
   [ -z `ps fauwwx | grep sshd.*${tty} | grep -v grep | sed -e 's/^[a-zA-Z0-9]\+[ \n\r\f\t]\+\([0-9]\+\).*/\1/'` ]; then
  echo -ne "[ERROR] terminal [$tty] does not exist.\n"
  example
  exit 1
fi

if [ ! -x "$(command -v strace)" ];then
  echo -ne "[ERROR] strace could not be executed.\n"
  echo -ne "Please check if strace is installed or executed.\n"
  exit 1
fi

pid=`ps fauwwx | grep sshd.*${tty} | grep -v grep | sed -e 's/^[a-zA-Z0-9]\+[ \n\r\f\t]\+\([0-9]\+\).*/\1/'`
user=`ps h -o user -p ${pid}`

echo -ne "[DEBUG] Scanning terminal $tty...\n"
echo -ne "[DEBUG] Terminal $tty is tied to user $user.\n"
echo -ne "[DEBUG] The pid of sshd:$user@$tty is $pid.\n"

strace -e read -s16384 -q -x -p ${pid} 2>&1 | sed -une "s/^read([0-9]\+, \"\(.*\)\".*/echo -n \$'\1'/p" | bash