samwiseetc/bash_completion.d/fail2ban

# fail2ban bash-completion                                 -*- shell-script -*-
#
# This file is part of Fail2Ban.
#
# Fail2Ban is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# Fail2Ban is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Fail2Ban; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

__fail2ban_jails () {
    "$1" status 2>/dev/null | awk -F"\t+" '/Jail list/{print $2}' | sed 's/, / /g'
}
__fail2ban_jail_actions () {
    "$1" get "$2" actions 2>/dev/null | sed -n '$s/\([^,]\+\),\?/\1/gp'
}
__fail2ban_jail_action_properties () {
    "$1" get "$2" actionproperties "$3" 2>/dev/null | sed -n '$s/\([^,]\+\),\?/\1/gp'
}
__fail2ban_jail_action_methods () {
    "$1" get "$2" actionmethods "$3" 2>/dev/null | sed -n '$s/\([^,]\+\),\?/\1/gp'
}

_fail2ban () {
    local cur prev words cword
    _init_completion || return

    case $prev in
        -V|--version|-h|--help)
            return 0 # No further completion valid
            ;;
        -c)
            _filedir -d # Directories
            return 0
            ;;
        -s|-p)
            _filedir # Files
            return 0
            ;;
        *)
            if [[ "$cur" == "-"* ]];then
                COMPREPLY=( $( compgen -W \
                    "$( _parse_help "$1" --help 2>/dev/null) -V" \
                     -- "$cur") )
                return 0
            fi
            ;;
    esac

    if [[ "$1" == *"fail2ban-regex" ]];then
        _filedir
        return 0
    elif [[ "$1" == *"fail2ban-client" ]];then
        local cmd jail action
        case $prev in
            "$1")
                COMPREPLY=( $( compgen -W \
                    "$( "$1" --help 2>/dev/null | awk '/^    [a-z]+/{print $1}')" \
                    -- "$cur") )
                return 0
                ;;
            start|reload|stop|status)
                COMPREPLY=( $(compgen -W "$(__fail2ban_jails "$1")" -- "$cur" ) )
                return 0
                ;;
            set|get)
                COMPREPLY=( $( compgen -W \
                    "$( "$1" --help 2>/dev/null | awk '/^    '$prev' [^<]/{print $2}')" \
                    -- "$cur") )
                COMPREPLY+=( $(compgen -W "$(__fail2ban_jails "$1")" -- "$cur" ) )
                return 0
                ;;
            *)
                if [[ "${words[$cword-2]}" == "add" ]];then
                    COMPREPLY=( $( compgen -W "auto polling gamin pyinotify systemd" -- "$cur" ) )
                    return 0
                elif [[ "${words[$cword-2]}" == "set" ||  "${words[$cword-2]}" == "get" ]];then
                    cmd="${words[cword-2]}"
                    # Handle in section below
                elif [[ "${words[$cword-3]}" == "set" || "${words[$cword-3]}" == "get" ]];then
                    cmd="${words[$cword-3]}"
                    jail="${words[$cword-2]}"
                    # Handle in section below
                elif [[ "${words[$cword-4]}" == "set" || "${words[$cword-4]}" == "get"  && ${words[$cword-2]} == action* ]];then
                    cmd="${words[$cword-4]}"
                    jail="${words[$cword-3]}"
                    action="${words[$cword-1]}"
                    # Handle in section below
                fi
            ;;
        esac

        if [[ -z "$jail" && -n "$cmd" ]];then
            case $prev in
                loglevel)
                    if [[ "$cmd" == "set" ]];then
                        COMPREPLY=( $( compgen -W "CRITICAL ERROR WARNING NOTICE INFO DEBUG" -- "$cur" ) )
                    fi
                    return 0
                    ;;
                logtarget)
                    if [[ "$cmd" == "set" ]];then
                        COMPREPLY=( $( compgen -W "STDOUT STDERR SYSLOG" -- "$cur" ) )
                        _filedir # And files
                    fi
                    return 0
                    ;;
                *) # Jail name
                    COMPREPLY=( $( compgen -W \
                        "$( "$1" --help 2>/dev/null | awk '/^    '${cmd}' <JAIL>/{print $3}')" \
                        -- "$cur") )
                    return 0
                    ;;
            esac
        elif [[ -n "$jail" && -n "$action" ]];then
            case ${words[$cwords-3]} in
                action)
                    COMPREPLY=( $( compgen -W \
                        "$( __fail2ban_jail_action_properties "$1" "$jail" "$action")" \
                    -- "$cur" ) )
                    if [[ "$cmd" == "set" ]];then
                        COMPREPLY+=( $(compgen -W "$(__fail2ban_jail_action_methods "$1" "$jail" "$action")" -- "$cur" ) )
                    fi
                    return 0
                    ;;
            esac
        elif [[ -n "$jail" && $prev == action* ]];then
            case $prev in
                action|actionproperties|actionmethods)
                    COMPREPLY=( $(compgen -W "$(__fail2ban_jail_actions "$1" "$jail")" -- "$cur" ) )
                    return 0
                    ;;
            esac
        elif [[ -n "$jail" && "$cmd" == "set" ]];then
            case $prev in
                addlogpath)
                    _filedir
                    return 0
                    ;;
                dellogpath|delignoreip)
                    COMPREPLY=( $( compgen -W \
                        "$( "$1" get "$jail" "${prev/del/}" 2>/dev/null | awk -F- '{print $2}')" \
                    -- "$cur" ) )
                    if [[ -z "$COMPREPLY" && "$prev" == "dellogpath" ]];then
                        _filedir
                    fi
                    return 0
                    ;;
                delfailregex|delignoreregex)
                    COMPREPLY=( $( compgen -W \
                        "$( "$1" get "$jail" "${prev/del/}" 2>/dev/null | awk -F"[][]" '{print $2}')" \
                    -- "$cur" ) )
                    return 0
                    ;;
                unbanip)
                    COMPREPLY=( $( compgen -W \
                        "$( "$1" status "$jail" 2>/dev/null | awk -F"\t+" '/IP list:/{print $2}')" \
                    -- "$cur" ) )
                    return 0
                    ;;
                idle)
                    COMPREPLY=( $( compgen -W "on off" -- "$cur" ) )
                    return 0
                    ;;
                usedns)
                    COMPREPLY=( $( compgen -W "yes no warn" -- "$cur" ) )
                    return 0
                    ;;
            esac
        fi

    fi # fail2ban-client
} &&
complete -F _fail2ban fail2ban-client fail2ban-server fail2ban-regex