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#!/bin/sh /etc/rc.common
# Copyright (C) 2006-2010 OpenWrt.org
# Copyright (C) 2006 Carlos Sobrinho
START=50
STOP=50
USE_PROCD=1
PROG=/usr/sbin/dropbear
NAME=dropbear
PIDCOUNT=0
EXTRA_COMMANDS="killclients"
EXTRA_HELP=" killclients Kill ${NAME} processes except servers and yourself"
append_ports()
{
local ipaddrs="$1"
local port="$2"
[ -z "$ipaddrs" ] && {
procd_append_param command -p "$port"
return
}
for addr in $ipaddrs; do
procd_append_param command -p "$addr:$port"
done
}
validate_section_dropbear()
{
uci_validate_section dropbear dropbear "${1}" \
'PasswordAuth:bool:1' \
'enable:bool:1' \
'Interface:string' \
'GatewayPorts:bool:0' \
'RootPasswordAuth:bool:1' \
'RootLogin:bool:1' \
'rsakeyfile:file' \
'BannerFile:file' \
'Port:list(port):22' \
'SSHKeepAlive:uinteger:300' \
'IdleTimeout:uinteger:0' \
'mdns:uinteger:1'
}
dropbear_instance()
{
local PasswordAuth enable Interface GatewayPorts \
RootPasswordAuth RootLogin rsakeyfile \
BannerFile Port SSHKeepAlive IdleTimeout \
mdns ipaddrs
validate_section_dropbear "${1}" || {
echo "validation failed"
return 1
}
[ -n "${Interface}" ] && {
network_get_ipaddrs_all ipaddrs "${Interface}" || {
echo "interface ${Interface} has no physdev or physdev has no suitable ip"
return 1
}
}
[ "${enable}" = "0" ] && return 1
PIDCOUNT="$(( ${PIDCOUNT} + 1))"
local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
procd_open_instance
procd_set_param command "$PROG" -F -P "$pid_file"
[ "${PasswordAuth}" -eq 0 ] && procd_append_param command -s
[ "${GatewayPorts}" -eq 1 ] && procd_append_param command -a
[ "${RootPasswordAuth}" -eq 0 ] && procd_append_param command -g
[ "${RootLogin}" -eq 0 ] && procd_append_param command -w
[ -n "${rsakeyfile}" ] && procd_append_param command -r "${rsakeyfile}"
[ -n "${BannerFile}" ] && procd_append_param command -b "${BannerFile}"
append_ports "${ipaddrs}" "${Port}"
[ "${IdleTimeout}" -ne 0 ] && procd_append_param command -I "${IdleTimeout}"
[ "${SSHKeepAlive}" -ne 0 ] && procd_append_param command -K "${SSHKeepAlive}"
[ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
procd_set_param respawn
procd_close_instance
}
keygen()
{
for keytype in rsa; do
# check for keys
key=dropbear/dropbear_${keytype}_host_key
[ -f /tmp/$key -o -s /etc/$key ] || {
# generate missing keys
mkdir -p /tmp/dropbear
[ -x /usr/bin/dropbearkey ] && {
/usr/bin/dropbearkey -t $keytype -f /tmp/$key 2>&- >&- && exec /etc/rc.common "$initscript" start
} &
exit 0
}
done
lock /tmp/.switch2jffs
mkdir -p /etc/dropbear
mv /tmp/dropbear/dropbear_* /etc/dropbear/
lock -u /tmp/.switch2jffs
chown root /etc/dropbear
chmod 0700 /etc/dropbear
}
start_service()
{
[ -s /etc/dropbear/dropbear_rsa_host_key ] || keygen
. /lib/functions.sh
. /lib/functions/network.sh
config_load "${NAME}"
config_foreach dropbear_instance dropbear
}
service_triggers()
{
procd_add_reload_trigger "dropbear"
procd_add_validation validate_section_dropbear
}
killclients()
{
local ignore=''
local server
local pid
# if this script is run from inside a client session, then ignore that session
pid="$$"
while [ "${pid}" -ne 0 ]
do
# get parent process id
pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
[ "${pid}" -eq 0 ] && break
# check if client connection
grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
append ignore "${pid}"
break
}
done
# get all server pids that should be ignored
for server in `cat /var/run/${NAME}.*.pid`
do
append ignore "${server}"
done
# get all running pids and kill client connections
local skip
for pid in `pidof "${NAME}"`
do
# check if correct program, otherwise process next pid
grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
continue
}
# check if pid should be ignored (servers, ourself)
skip=0
for server in ${ignore}
do
if [ "${pid}" = "${server}" ]
then
skip=1
break
fi
done
[ "${skip}" -ne 0 ] && continue
# kill process
echo "${initscript}: Killing ${pid}..."
kill -KILL ${pid}
done
}
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