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         [ "${passauth}" -eq 0 ] && nopasswd=1
  35         # B) listen interface and port
  36         local port
  37         local interface
  38         local address
  39         config_get port "${section}" Port
  40         config_get interface "${section}" Interface
  41         config_get address "${interface}" ipaddr
  42         port="${address:+${address}:}${port}"
  43         # C) banner file
  44         local bannerfile
  45         config_get bannerfile "${section}" BannerFile
  46         [ -f "$bannerfile" ] || bannerfile=''
  47         # D) gatewayports
  48         local gatewayports
  49         config_get_bool gatewayports "${section}" GatewayPorts 0
  50         [ "${gatewayports}" -eq 1 ] || gatewayports=''
  51         # E) root password authentication
  52         local norootpasswd
  53         local rootpassauth
  54         config_get_bool rootpassauth "${section}" RootPasswordAuth 1
  55         [ "${rootpassauth}" -eq 0 ] && norootpasswd=1
  56         local rootloginallowed
  57         local norootlogin
  58         config_get_bool rootloginallowed "${section}" RootLogin 1
  59         [ "${rootloginallowed}" -eq 0 ] && norootlogin=1
  60         # concatenate parameters
  61         local args
  62         args="${nopasswd:+-s }${norootpasswd:+-g }${norootlogin:+-w }${port:+-p ${port} }${bannerfile:+-b $bannerfile }${gatewayports:+-a }-P /var/run/${NAME}.${PIDCOUNT}.pid"
  63
  64         # execute program and return its exit code
  65         [ "${verbosed}" -ne 0 ] && echo "${initscript}: section ${section} starting ${PROG} ${args}"
  66         ${PROG} ${args}
  67         return $?
  68 }
  69
  70 keygen()
  71 {
  72         for keytype in rsa dss; do
  73                 # check for keys
  74                 key=dropbear/dropbear_${keytype}_host_key
  75                 [ -f /tmp/$key -o -s /etc/$key ] || {
  76                         # generate missing keys
  77                         mkdir -p /tmp/dropbear
  78                         [ -x /usr/bin/dropbearkey ] && {
  79                                 /usr/bin/dropbearkey -t $keytype -f /tmp/$key 2>&- >&- && exec /etc/rc.common "$initscript" start
  80                         } &
  81                 exit 0
  82                 }
  83         done
  84
  85         lock /tmp/.switch2jffs
  86         mkdir -p /etc/dropbear
  87         mv /tmp/dropbear/dropbear_* /etc/dropbear/
  88         lock -u /tmp/.switch2jffs
  89         chown root /etc/dropbear
  90         chmod 0700 /etc/dropbear
  91 }
  92
  93 start()
  94 {
  95         [ -s /etc/dropbear/dropbear_rsa_host_key -a \
  96           -s /etc/dropbear/dropbear_dss_host_key ] || keygen
  97
  98         include /lib/network
  99         scan_interfaces
 100         config_load "${NAME}"
 101         config_foreach dropbear_start dropbear
 102 }
 103
 104 stop()
 105 {
 106         # killing all server processes
 107         local pidfile
 108         for pidfile in `ls /var/run/${NAME}.*.pid`
 109          do
 110                 start-stop-daemon -q -K -s KILL -p "${pidfile}" -n "${NAME}"
 111                 rm -f "${pidfile}"
 112         done
 113         [ -z "${pidfile}" ] && echo "${initscript}: no pid files, if you get problems with start then try killclients"
 114 }
 115
 116 killclients()
 117 {
 118         local ignore=''
 119         local server
 120         local pid
 121
 122         # if this script is run from inside a client session, then ignore that session
 123         pid="$$"
 124         while [ "${pid}" -ne 0 ]
 125          do
 126                 # get parent process id
 127                 pid=`cut -d ' ' -f 4 "/proc/${pid}/stat"`
 128                 [ "${pid}" -eq 0 ] && break
 129
 130                 # check if client connection
 131                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" && {
 132                         append ignore "${pid}"
 133                         break
 134                 }
 135         done
 136
 137         # get all server pids that should be ignored
 138         for server in `cat /var/run/${NAME}.*.pid`
 139          do
 140                 append ignore "${server}"
 141         done
 142
 143         # get all running pids and kill client connections
 144         local skip
 145         for pid in `pidof "${NAME}"`
 146          do
 147                 # check if correct program, otherwise process next pid
 148                 grep -F -q -e "${PROG}" "/proc/${pid}/cmdline" || {
 149                         continue
 150                 }
 151
 152                 # check if pid should be ignored (servers, ourself)
 153                 skip=0
 154                 for server in ${ignore}
 155                  do
 156                         if [ "${pid}" == "${server}" ]
 157                          then
 158                                 skip=1
 159                                 break
 160                         fi
 161                 done
 162                 [ "${skip}" -ne 0 ] && continue
 163
 164                 # kill process
 165                 echo "${initscript}: Killing ${pid}..."
 166                 kill -KILL ${pid}
 167         done
 168 }