release/src/router/busybox/examples/var_service/dhcp_if/dhcp_handler

   1 #!/bin/sh
   2 # executed by udhcpc
   3 # parameters: $1 and environment
   4 # $1 is:
   5 #
   6 # deconfig: udhcpc starts, or lease is lost.
   7 # Environment example: interface=eth0
   8 #
   9 # bound: lease is obtained. Environment example:
  10 # dhcptype=5
  11 # serverid=172.16.42.102
  12 # lease=97200
  13 # interface=eth0
  14 # ip=172.16.42.177
  15 # subnet=255.255.255.0
  16 # mask=24
  17 # broadcast=172.16.22.255
  18 # router=172.16.42.98
  19 # dns=10.34.32.125 10.32.63.5 10.34.255.7 10.11.255.27
  20 # domain=lab.example.com example.com
  21 # ntpsrv=10.34.32.125 10.34.255.7
  22 #
  23 # renew: lease is renewed. Environment is similar to "bound".
  24 # The IP address does not change, however, the other DHCP paramaters,
  25 # such as the default gateway, subnet mask, and dns server may change.
  26 #
  27 # nak: udhcpc received a NAK message.
  28 # Environment example: interface=eth0
  29 #
  30 # leasefail: udhcpc cannot obtain a lease (DHCP server not responding, etc).
  31 # Environment example: interface=eth0
  32
  33 # TODO: put $domain into /etc/resolv.conf (thru /var/service/fw)
  34
  35 service=${PWD##*/}
  36 file_ipconf="$service.ipconf"
  37 file_ntpconf="$service.ntpconf"
  38 dir_ipconf="/var/run/service/fw"
  39 dir_ntpconf="/var/run/service/ntpd"
  40
  41 exec >/dev/null
  42 #exec >>"$0.out"  #debug
  43 exec 2>&1
  44
  45 echo "`date`: Params: $*"
  46
  47 if test x"$1" != x"bound" && test x"$1" != x"renew" ; then
  48         # Reconfigure network with this interface disabled
  49         echo "Deconfiguring"
  50         rm "env.out"
  51         rm "$file_ipconf"
  52         rm "$file_ntpconf"
  53         rm "$dir_ipconf/$file_ipconf"
  54         rm "$dir_ntpconf/$file_ntpconf"
  55         sv u /var/service/fw
  56         exit
  57 fi
  58
  59 # Bound: we've got the lease
  60 # Record information for e.g. dhcp_$IF_pinger service
  61 env >"env.out"
  62
  63 ./convert2ipconf "$file_ipconf"
  64 # Reconfigure routing and firewall if needed
  65 diff --brief "$file_ipconf" "$dir_ipconf/$file_ipconf" >/dev/null 2>&1
  66 if test $? != 0; then
  67         echo "Reconfiguring fw"
  68         mkdir -p "$dir_ipconf" 2>/dev/null
  69         cp "$file_ipconf" "$dir_ipconf/$file_ipconf"
  70         sv u /var/service/fw
  71 fi
  72
  73 if test -d /var/service/ntpd; then
  74         ./convert2ntpconf "$file_ntpconf"
  75         # Reconfigure ntp server addresses if needed
  76         diff --brief "$file_ntpconf" "$dir_ntpconf/$file_ntpconf" >/dev/null 2>&1
  77         if test $? != 0; then
  78                 echo "Reconfiguring ntp"
  79                 mkdir -p "$dir_ntpconf" 2>/dev/null
  80                 cp "$file_ntpconf" "$dir_ntpconf/$file_ntpconf"
  81                 sv t /var/service/ntpd
  82                 sv u /var/service/ntpd
  83         fi
  84 fi