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#!/bin/sh /etc/rc.common
# Copyright (C) 2006-2010 OpenWrt.org
# Copyright (C) 2006 Carlos Sobrinho
NAME=dropbear
PROG=/usr/sbin/dropbear
START=50
STOP=50
PIDCOUNT=0
EXTRA_COMMANDS="killclients"
EXTRA_HELP=" killclients Kill ${NAME} processes except servers and yourself"
dropbear_start()
{
append_ports()
{
local ifname="$1"
local port="$2"
grep -qs "^ *$ifname:" /proc/net/dev || {
append args "-p $port"
return
}
for addr in $(
ifconfig "$ifname" | sed -ne '
/addr: *fe[89ab][0-9a-f]:/d
s/.* addr: *\([0-9a-f:\.]*\).*/\1/p
'
); do
append args "-p $addr:$port"
done
}
local section="$1"
# check if section is enabled (default)
local enabled
config_get_bool enabled "${section}" enable 1
[ "${enabled}" -eq 0 ] && return 1
# verbose parameter
local verbosed
config_get_bool verbosed "${section}" verbose 0
# increase pid file count to handle multiple instances correctly
PIDCOUNT="$(( ${PIDCOUNT} + 1))"
# prepare parameters (initialise with pid file)
local args="-P /var/run/${NAME}.${PIDCOUNT}.pid"
local val
# A) password authentication
config_get_bool val "${section}" PasswordAuth 1
[ "${val}" -eq 0 ] && append args "-s"
# B) listen interface and port
local port
local interface
config_get interface "${section}" Interface
config_get interface "${interface}" ifname "$interface"
config_get port "${section}" Port 22
append_ports "$interface" "$port"
# C) banner file
config_get val "${section}" BannerFile
[ -f "${val}" ] && append args "-b ${val}"
# D) gatewayports
config_get_bool val "${section}" GatewayPorts 0
[ "${val}" -eq 1 ] && append args "-a"
# E) root password authentication
config_get_bool val "${section}" RootPasswordAuth 1
[ "${val}" -eq 0 ] && append args "-g"
# F) root login
config_get_bool val "${section}" RootLogin 1
[ "${val}" -eq 0 ] && append args "-w"
# G) host keys
config_get val "${section}" rsakeyfile
[ -f "${val}" ] && append args "-r ${val}"
config_get val "${section}" dsskeyfile
[ -f "${val}" ] && append args "-d ${val}"
# execute program and return its exit code
[ "${verbosed}" -ne 0 ] && echo "${initscript}: section ${section} starting ${PROG} ${args}"
${PROG} ${args}
return $?
}
keygen()
{
for keytype in rsa dss; do
# check for keys
key=dropbear/dropbear_${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 "$initscript" start
} &
exit 0
}
done
lock /tmp/.switch2jffs
mkdir -p /etc/dropbear
mv /tmp/dropbear/dropbear_* /etc/dropbear/
lock -u /tmp/.switch2jffs
chown root /etc/dropbear
chmod 0700 /etc/dropbear
}
start()
{
[ -s /etc/dropbear/dropbear_rsa_host_key -a \
-s /etc/dropbear/dropbear_dss_host_key ] || keygen
include /lib/network
scan_interfaces
config_load "${NAME}"
config_foreach dropbear_start dropbear
}
stop()
{
# killing all server processes
local pidfile
for pidfile in `ls /var/run/${NAME}.*.pid`
do
start-stop-daemon -q -K -s KILL -p "${pidfile}" -n "${NAME}"
rm -f "${pidfile}"
done
[ -z "${pidfile}" ] && echo "${initscript}: no pid files, if you get problems with start then try killclients"
}
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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