#/bin/bash

#
# little class about bash extension parametters.
#
# ${myvar#pattern} delete shortest occurence from the begining
# ${myvar##pattern} delete longuest occurence from begining
# ${myvar%pattern} delete shortest occurence from the end
# ${myvar%%pattern} delete longuest occurence from the end
#
# conclusion, use of # will delete the pattern at begining
# and % will delete the parameter at the end.


USER="root"
PORT=10022
VERSION="1.0"

HELP_MESSAGE="
ssh-local [OPTION] [OPTION=VALUE]

script which permit to launch ssh to connect to the vm on localhost without letting any traces on this computer.

    -u <user>,--user=<user>     Select the user, by default root
    -p <port>,--port=<port>     Select the port, by default 10022
    -v, --version               print the version and exit
    -h, --help                  print this help and exit
"


# looking for double parametters.

for (( arg=1; arg<$#; arg++)); do
    value="$((arg+1))"
    if [ "${!arg}" == "-u" ]
    then
        USER=${!value}
    elif [ "${!arg}" == "-p" ]
    then
        PORT=${!value}
    fi
done


# looking for all parametter alone

for i in "$@"; do
    if [ "${i%=*}" == "--user" ]
    then
        USER="${i#*=}"
    elif [ "${i%=*}" == "--port" ]
    then
        PORT="${i#*=}"
    elif [ "${i}" == "--version" ] || [ "${i}" == "-v" ]
    then
        echo "Prog ssh-local v.${VERSION}"
        exit 0
    elif [ "${i}" == "--help" ] || [ "${i}" == "-h" ]
    then
        echo "$HELP_MESSAGE"
        exit 0
    fi
done

echo user=${USER}
echo port=${PORT}

ssh -o "StrictHostKeyChecking no" -o "UserKnownHostsFile=/dev/null" ${USER}@localhost -p ${PORT}