+# 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()
+{
+ 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
+ [ "${val}" -eq 0 ] && append args "-s"
+ # B) listen interface and port
+ local interface
+ local address
+ config_get interface "${section}" Interface
+ config_get address "${interface}" ipaddr
+ config_get val "${section}" Port
+ val="${address:+${address}:}${val}"
+ [ -n "${val}" ] && append args "-p ${val}"
+ # C) banner file
+ config_get val "${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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