src/dhclient-script

   1 #!/bin/bash
   2
   3 . /usr/lib/network/functions
   4
   5 # Configure logging
   6 LOG_FACILITY="dhclient-script"
   7
   8 assert isset interface
   9 assert isset reason
  10
  11 assert device_exists ${interface}
  12
  13 basename="$(basename $0)"
  14 log DEBUG "${basename} called for interface=${interface} reason=${reason}"
  15
  16 # Main pitchfork.
  17 case "${reason}" in
  18         MEDIUM)
  19                 # Linux does not handle MEDIUM.
  20                 exit 0
  21                 ;;
  22
  23         PREINIT)
  24                 # Bring up the device if it hasn't been done before.
  25                 if ! device_is_up ${interface}; then
  26                         log DEBUG "The interface '${interface}' does not appear to be up."
  27
  28                         zone_up ${interface}
  29                 fi
  30
  31                 # If the use configured a delay, we will honour that.
  32                 if [ -n "${DELAY}"  ]; then
  33                         assert isinteger DELAY
  34                         sleep ${DELAY}
  35
  36                 # If he didn't, we will try to detect is STP has brought the
  37                 # bridge up.
  38                 elif device_is_bridge ${interface}; then
  39                         counter=60
  40
  41                         while [ ${counter} -gt 0 ]; do
  42                                 # We may end this, when the bridge is in forwarding mode.
  43                                 if bridge_is_forwarding ${interface}; then
  44                                         log DEBUG "Bridge '${interface}' is in forwarding mode."
  45                                         break
  46                                 fi
  47
  48                                 counter=$(( ${counter} - 1 ))
  49                                 sleep 1
  50                         done
  51
  52                         # Tell the daemon, that we are not ready to go on.
  53                         if [ ${counter} -eq 0 ]; then
  54                                 log ERROR "Bridge '${interface}' is not in forwarding mode."
  55                                 log ERROR "Could not go on with getting a DHCP lease. Exiting."
  56
  57                                 exit 1
  58                         fi
  59                 fi
  60
  61                 exit 0
  62                 ;;
  63
  64
  65         BOUND|RENEW|REBIND|REBOOT)
  66                 # Check if the IP address has changed. If so, delete all routes and stuff.
  67                 if [ -n "${old_ip_address}" -a "${old_ip_address}" != "${new_ip_address}" ]; then
  68                         ipv4_flush_device ${interface}
  69                 fi
  70
  71                 case "${reason}" in
  72                         BOUND|REBOOT)
  73                                 if [ ! "${old_ip_address}" = "${new_ip_address}" ] || \
  74                                         [ ! "${old_subnet_mask}" = "${new_subnet_mask}" ] || \
  75                                         [ ! "${old_network_number}" = "${new_network_number}" ] || \
  76                                         [ ! "${old_broadcast_address}" = "${new_broadcast_address}" ] || \
  77                                         [ ! "${old_routers}" = "${new_routers}" ] || \
  78                                         [ ! "${old_interface_mtu}" = "${new_interface_mtu}" ]; then
  79
  80
  81                                         # Calc a prefix out of address and subnet mask.
  82                                         new_prefix="$(ipv4_get_prefix ${new_ip_address} ${new_subnet_mask})"
  83
  84                                         # Set the new ip address.
  85                                         ip_address_add ${interface} ${new_ip_address}/${new_prefix}
  86                                         device_set_up ${interface}
  87
  88
  89                                         # A MTU of 576 is used for X.25 and dialup connections. Some broken DHCP
  90                                         # servers send out an MTU of 576 bytes, which will be ignored.
  91                                         if [ -n "${new_interface_mtu}" ] && [ ${new_interface_mtu} -gt 576 ]; then
  92                                                 device_set_mtu ${interface} ${new_interface_mtu}
  93                                         fi
  94
  95                                         # Save configuration
  96                                         routing_db_set ${interface} ipv4 type "ipv4-dhcp"
  97                                         routing_db_set ${interface} ipv4 local-ip-address "${new_ip_address}/${new_prefix}"
  98                                         routing_db_set ${interface} ipv4 remote-ip-address "${new_routers}"
  99                                         routing_db_set ${interface} ipv4 active 1
 100                                         routing_db_set ${interface} ipv4 domain-name "${new_domain_name}"
 101                                         routing_db_set ${interface} ipv4 domain-name-servers "${new_domain_name_servers}"
 102                                         routing_db_set ${interface} ipv4 domain-name-servers-priority "${DNS_SERVER_DYNAMIC_PRIORITY}"
 103
 104                                         # Update the routing tables.
 105                                         routing_update ${interface} ipv4
 106                                         routing_default_update
 107
 108                                         # Update resolv.conf
 109                                         dns_generate_resolvconf
 110                                 fi
 111                                 ;;
 112                 esac
 113
 114                 exit 0
 115                 ;;
 116
 117         EXPIRE|FAIL|RELEASE|STOP)
 118                 # Remove the currently configured addresses from the device.
 119                 if [ -n "${old_ip_address}" ]; then
 120                         ipv4_flush_device ${interface}
 121                 fi
 122
 123                 routing_db_remove ${interface} ipv4
 124                 routing_default_update
 125
 126                 exit 0
 127                 ;;
 128 esac
 129
 130 exit 1