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