package/dropbear/files/dropbear.init

   1 #!/bin/sh /etc/rc.common
   2 # Copyright (C) 2006-2009 OpenWrt.org
   3 # Copyright (C) 2006 Carlos Sobrinho
   4
   5 NAME=dropbear
   6 PROG=/usr/sbin/dropbear
   7 START=50
   8 PIDCOUNT=0
   9 EXTRA_COMMANDS="killclients"
  10 EXTRA_HELP="    killclients Kill ${NAME} processes except servers and yourself"
  11
  12 dropbear_start()
  13 {
  14         local section="$1"
  15
  16         # check if section is enabled (default)
  17         local enabled
  18         config_get_bool enabled "${section}" enable 1
  19         [ "${enabled}" -eq 0 ] && return 1
  20
  21         # verbose parameter
  22         local verbosed
  23         config_get_bool verbosed "${section}" verbose 0
  24
  25         # increase pid file count to handle multiple instances correctly
  26         PIDCOUNT="$(( ${PIDCOUNT} + 1))"
  27
  28         # prepare parameters
  29         # A) password authentication
  30         local nopasswd
  31         local passauth
  32         config_get_bool passauth "${section}" PasswordAuth 1
  33         [ "${passauth}" -eq 0 ] && nopasswd=1
  34         # B) listen port
  35         local port
  36         config_get port "${section}" Port
  37
  38         # concatenate parameters
  39         local args
  40         args="${nopasswd:+-s }${port:+-p ${port}} -P /var/run/${NAME}.${PIDCOUNT}.pid"
  41
  42         # execute program and return its exit code
  43         [ "${verbosed}" -ne 0 ] && echo "${initscript}: section ${section} starting ${PROG} ${args}"
  44         ${PROG} ${args}
  45         return $?
  46 }
  47
  48 keygen()
  49 {
  50         for keytype in rsa dss; do
  51                 # check for keys
  52                 key=dropbear/dropbear_${keytype}_host_key
  53                 [ -f /tmp/$key -o -s /etc/$key ] || {
  54                         # generate missing keys
  55                         mkdir -p /tmp/dropbear
  56                         [ -x /usr/bin/dropbearkey ] && {
  57                                 /usr/bin/dropbearkey -t $keytype -f /tmp/$key 2>&- >&- && exec /etc/rc.common "$initscript" start
  58                         } &
  59                 exit 0
  60                 }
  61         done
  62
  63         lock /tmp/.switch2jffs
  64         mkdir -p /etc/dropbear
  65         mv /tmp/dropbear/dropbear_* /etc/dropbear/
  66         lock -u /tmp/.switch2jffs
  67         chown root /etc/dropbear
  68         chmod 0700 /etc/dropbear
  69 }
  70
  71 start()
  72 {
  73         [ -s /etc/dropbear/dropbear_rsa_host_key -a \
  74           -s /etc/dropbear/dropbear_dss_host_key ] || keygen
  75
  76         config_load "${NAME}"
  77         config_foreach dropbear_start dropbear
  78 }
  79
  80 stop()
  81 {
  82         # killing all server processes
  83         local pidfile
  84         for pidfile in `ls /var/run/${NAME}.*.pid`
  85          do
  86                 start-stop-daemon -K -s KILL -p "${pidfile}" -n "${NAME}" >/dev/null
  87                 rm -f "${pidfile}"
  88         done
  89         [ -z "${pidfile}" ] && echo "${initscript}: no pid files, if you get problems with start then try killclients"
  90 }
  91
  92 killclients()
  93 {
  94         local ignore=''
  95         local server
  96         local pid
  97
  98         # if this script is run from inside a client session, then ignore that session
  99         pid="$$"
 100         while [ "${pid}" -ne 0 ]
 101          do
 102                 # get parent process id
 103                 pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
 104                 [ "${pid}" -eq 0 ] && break
 105
 106                 # check if client connection
 107                 ps | grep -e "^[ ]*${pid} " | grep "${PROG}" >/dev/null
 108                 if [ $? -eq 0 ]
 109                  then
 110                         append ignore "${pid}"
 111                         break
 112                 fi
 113         done
 114
 115         # get all server pids that should be ignored
 116         for server in `cat /var/run/${NAME}.*.pid`
 117          do
 118                 append ignore "${server}"
 119         done
 120
 121         # get all running pids and kill client connections
 122         local skip
 123         for pid in `pidof "${NAME}"`
 124          do
 125                 # check if correct program
 126                 ps | grep -e "^[ ]*${pid} " | grep "${PROG}" >/dev/null
 127                 [ $? -ne 0 ] && continue
 128
 129                 # check if pid should be ignored (servers, ourself)
 130                 skip=0
 131                 for server in ${ignore}
 132                  do
 133                         if [ "${pid}" == "${server}" ]
 134                          then
 135                                 skip=1
 136                                 break
 137                         fi
 138                 done
 139                 [ "${skip}" -ne 0 ] && continue
 140
 141                 # kill process
 142                 echo "${initscript}: Killing ${pid}..."
 143                 kill -KILL ${pid}
 144         done
 145 }