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         # C) banner file
  38         local bannerfile
  39         config_get bannerfile ${section} BannerFile
  40         [ -f $bannerfile ] || bannerfile=''
  41
  42         # concatenate parameters
  43         local args
  44         args="${nopasswd:+-s }${port:+-p ${port} }${bannerfile:+-b $bannerfile }-P /var/run/${NAME}.${PIDCOUNT}.pid"
  45
  46         # execute program and return its exit code
  47         [ "${verbosed}" -ne 0 ] && echo "${initscript}: section ${section} starting ${PROG} ${args}"
  48         ${PROG} ${args}
  49         return $?
  50 }
  51
  52 keygen()
  53 {
  54         for keytype in rsa dss; do
  55                 # check for keys
  56                 key=dropbear/dropbear_${keytype}_host_key
  57                 [ -f /tmp/$key -o -s /etc/$key ] || {
  58                         # generate missing keys
  59                         mkdir -p /tmp/dropbear
  60                         [ -x /usr/bin/dropbearkey ] && {
  61                                 /usr/bin/dropbearkey -t $keytype -f /tmp/$key 2>&- >&- && exec /etc/rc.common "$initscript" start
  62                         } &
  63                 exit 0
  64                 }
  65         done
  66
  67         lock /tmp/.switch2jffs
  68         mkdir -p /etc/dropbear
  69         mv /tmp/dropbear/dropbear_* /etc/dropbear/
  70         lock -u /tmp/.switch2jffs
  71         chown root /etc/dropbear
  72         chmod 0700 /etc/dropbear
  73 }
  74
  75 start()
  76 {
  77         [ -s /etc/dropbear/dropbear_rsa_host_key -a \
  78           -s /etc/dropbear/dropbear_dss_host_key ] || keygen
  79
  80         config_load "${NAME}"
  81         config_foreach dropbear_start dropbear
  82 }
  83
  84 stop()
  85 {
  86         # killing all server processes
  87         local pidfile
  88         for pidfile in `ls /var/run/${NAME}.*.pid`
  89          do
  90                 start-stop-daemon -K -s KILL -p "${pidfile}" -n "${NAME}" >/dev/null
  91                 rm -f "${pidfile}"
  92         done
  93         [ -z "${pidfile}" ] && echo "${initscript}: no pid files, if you get problems with start then try killclients"
  94 }
  95
  96 killclients()
  97 {
  98         local ignore=''
  99         local server
 100         local pid
 101
 102         # if this script is run from inside a client session, then ignore that session
 103         pid="$$"
 104         while [ "${pid}" -ne 0 ]
 105          do
 106                 # get parent process id
 107                 pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
 108                 [ "${pid}" -eq 0 ] && break
 109
 110                 # check if client connection
 111                 ps | grep -e "^[ ]*${pid} " | grep "${PROG}" >/dev/null
 112                 if [ $? -eq 0 ]
 113                  then
 114                         append ignore "${pid}"
 115                         break
 116                 fi
 117         done
 118
 119         # get all server pids that should be ignored
 120         for server in `cat /var/run/${NAME}.*.pid`
 121          do
 122                 append ignore "${server}"
 123         done
 124
 125         # get all running pids and kill client connections
 126         local skip
 127         for pid in `pidof "${NAME}"`
 128          do
 129                 # check if correct program
 130                 ps | grep -e "^[ ]*${pid} " | grep "${PROG}" >/dev/null
 131                 [ $? -ne 0 ] && continue
 132
 133                 # check if pid should be ignored (servers, ourself)
 134                 skip=0
 135                 for server in ${ignore}
 136                  do
 137                         if [ "${pid}" == "${server}" ]
 138                          then
 139                                 skip=1
 140                                 break
 141                         fi
 142                 done
 143                 [ "${skip}" -ne 0 ] && continue
 144
 145                 # kill process
 146                 echo "${initscript}: Killing ${pid}..."
 147                 kill -KILL ${pid}
 148         done
 149 }