package/dropbear/files/dropbear.init

   1 #!/bin/sh /etc/rc.common
   2 # Copyright (C) 2006-2010 OpenWrt.org
   3 # Copyright (C) 2006 Carlos Sobrinho
   4
   5 NAME=dropbear
   6 PROG=/usr/sbin/dropbear
   7 START=50
   8 STOP=50
   9 PIDCOUNT=0
  10 EXTRA_COMMANDS="killclients"
  11 EXTRA_HELP="    killclients Kill ${NAME} processes except servers and yourself"
  12
  13 dropbear_start()
  14 {
  15         local section="$1"
  16
  17         # check if section is enabled (default)
  18         local enabled
  19         config_get_bool enabled "${section}" enable 1
  20         [ "${enabled}" -eq 0 ] && return 1
  21
  22         # verbose parameter
  23         local verbosed
  24         config_get_bool verbosed "${section}" verbose 0
  25
  26         # increase pid file count to handle multiple instances correctly
  27         PIDCOUNT="$(( ${PIDCOUNT} + 1))"
  28
  29         # prepare parameters
  30         # A) password authentication
  31         local nopasswd
  32         local passauth
  33         config_get_bool passauth "${section}" PasswordAuth 1
  34         [ "${passauth}" -eq 0 ] && nopasswd=1
  35         # B) listen port
  36         local port
  37         config_get port "${section}" Port
  38         # C) banner file
  39         local bannerfile
  40         config_get bannerfile "${section}" BannerFile
  41         [ -f "$bannerfile" ] || bannerfile=''
  42         # D) gatewayports
  43         local gatewayports
  44         config_get_bool gatewayports "${section}" GatewayPorts 0
  45         [ "${gatewayports}" -eq 1 ] || gatewayports=''
  46         # E) root password authentication
  47         local norootpasswd
  48         local rootpassauth
  49         config_get_bool rootpassauth "${section}" RootPasswordAuth 1
  50         [ "${rootpassauth}" -eq 0 ] && norootpasswd=1
  51         # concatenate parameters
  52         local args
  53         args="${nopasswd:+-s }${norootpasswd:+-g }${port:+-p ${port} }${bannerfile:+-b $bannerfile }${gatewayports:+-a }-P /var/run/${NAME}.${PIDCOUNT}.pid"
  54
  55         # execute program and return its exit code
  56         [ "${verbosed}" -ne 0 ] && echo "${initscript}: section ${section} starting ${PROG} ${args}"
  57         ${PROG} ${args}
  58         return $?
  59 }
  60
  61 keygen()
  62 {
  63         for keytype in rsa dss; do
  64                 # check for keys
  65                 key=dropbear/dropbear_${keytype}_host_key
  66                 [ -f /tmp/$key -o -s /etc/$key ] || {
  67                         # generate missing keys
  68                         mkdir -p /tmp/dropbear
  69                         [ -x /usr/bin/dropbearkey ] && {
  70                                 /usr/bin/dropbearkey -t $keytype -f /tmp/$key 2>&- >&- && exec /etc/rc.common "$initscript" start
  71                         } &
  72                 exit 0
  73                 }
  74         done
  75
  76         lock /tmp/.switch2jffs
  77         mkdir -p /etc/dropbear
  78         mv /tmp/dropbear/dropbear_* /etc/dropbear/
  79         lock -u /tmp/.switch2jffs
  80         chown root /etc/dropbear
  81         chmod 0700 /etc/dropbear
  82 }
  83
  84 start()
  85 {
  86         [ -s /etc/dropbear/dropbear_rsa_host_key -a \
  87           -s /etc/dropbear/dropbear_dss_host_key ] || keygen
  88
  89         config_load "${NAME}"
  90         config_foreach dropbear_start dropbear
  91 }
  92
  93 stop()
  94 {
  95         # killing all server processes
  96         local pidfile
  97         for pidfile in `ls /var/run/${NAME}.*.pid`
  98          do
  99                 start-stop-daemon -q -K -s KILL -p "${pidfile}" -n "${NAME}"
 100                 rm -f "${pidfile}"
 101         done
 102         [ -z "${pidfile}" ] && echo "${initscript}: no pid files, if you get problems with start then try killclients"
 103 }
 104
 105 killclients()
 106 {
 107         local ignore=''
 108         local server
 109         local pid
 110
 111         # if this script is run from inside a client session, then ignore that session
 112         pid="$$"
 113         while [ "${pid}" -ne 0 ]
 114          do
 115                 # get parent process id
 116                 pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
 117                 [ "${pid}" -eq 0 ] && break
 118
 119                 # check if client connection
 120                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
 121                         append ignore "${pid}"
 122                         break
 123                 }
 124         done
 125
 126         # get all server pids that should be ignored
 127         for server in `cat /var/run/${NAME}.*.pid`
 128          do
 129                 append ignore "${server}"
 130         done
 131
 132         # get all running pids and kill client connections
 133         local skip
 134         for pid in `pidof "${NAME}"`
 135          do
 136                 # check if correct program, otherwise process next pid
 137                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
 138                         continue
 139                 }
 140
 141                 # check if pid should be ignored (servers, ourself)
 142                 skip=0
 143                 for server in ${ignore}
 144                  do
 145                         if [ "${pid}" == "${server}" ]
 146                          then
 147                                 skip=1
 148                                 break
 149                         fi
 150                 done
 151                 [ "${skip}" -ne 0 ] && continue
 152
 153                 # kill process
 154                 echo "${initscript}: Killing ${pid}..."
 155                 kill -KILL ${pid}
 156         done
 157 }