src/dhclient-script

   1 #!/bin/bash
   2
   3 . /usr/lib/network/functions
   4
   5 # Configure logging
   6 LOG_FACILITY="dhclient-script"
   7
   8 network_settings_read
   9
  10 assert isset interface
  11 assert isset reason
  12
  13 assert device_exists ${interface}
  14
  15 basename="$(basename $0)"
  16 log DEBUG "${basename} called for interface=${interface} reason=${reason}"
  17
  18 # Log all information from dhclient
  19 if enabled DEBUG; then
  20         while read line; do
  21                 [[ ${line} =~ ^(cur|old|new)_ ]] || continue
  22                 log DEBUG "  ${line}"
  23         done <<< "$(printenv | sort)"
  24 fi
  25
  26 # Main pitchfork.
  27 case "${reason}" in
  28         MEDIUM)
  29                 # Linux does not handle MEDIUM.
  30                 exit 0
  31                 ;;
  32
  33         # IPv6
  34
  35         PREINIT6)
  36                 if ! device_is_up "${interface}"; then
  37                         log WARNING "Device '${interface}' was not brought up before starting the DHCP client"
  38                         device_set_up "${interface}"
  39                 fi
  40
  41                 # Flush all other aborted IP addresses
  42                 ipv6_address_flush "${interface}"
  43
  44                 # Wait until DAD for the link-local address has finished
  45                 for address in $(ipv6_device_get_addresses "${interface}" --scope="link"); do
  46                         ipv6_wait_for_dad "${address}" "${interface}" && exit ${EXIT_OK}
  47                 done
  48
  49                 log ERROR "There is no active link-local address on ${interface}"
  50
  51                 exit ${EXIT_ERROR}
  52                 ;;
  53
  54         BOUND6)
  55                 # We will be called twice. Once for the assigned address and once for an assigned prefix.
  56
  57                 # Handle temporarily-assigned address
  58                 if isset new_ip6_address && isset new_ip6_prefixlen; then
  59                         ipv6_address_add "${new_ip6_address}/${new_ip6_prefixlen}" "${interface}" \
  60                                 --valid-lifetime="${new_max_life}" --preferred-lifetime="${new_preferred_life}"
  61
  62                         # Save configuration
  63                         db_set "${interface}/ipv6/local-ip-address" "${new_ip6_address}/${new_ip6_prefixlen}"
  64                         db_set "${interface}/ipv6/active" 1
  65                         #db_set "${interface}/ipv6/domain-name" "${new_
  66
  67                         exit 0
  68
  69                 # Handle Prefix Delegation
  70                 elif isset new_ip6_prefix; then
  71                         db_set "${interface}/ipv6/delegated-prefix" "${new_ip6_prefix}"
  72
  73                         exit 0
  74                 fi
  75                 ;;
  76
  77         RENEW6|REBIND6)
  78                 # Will be called twice like BOUND6.
  79
  80                 if isset new_ip6_address && isset new_ip6_prefixlen; then
  81                         # Update nameservers if those have changed
  82                         if [[ "${old_dhcp6_name_servers}" != "${new_dhcp6_name_servers}" ]]; then
  83                                 db_set "${interface}/ipv6/domain-name-servers" "${new_dhcp6_name_servers}"
  84                                 dns_generate_resolvconf
  85                         fi
  86
  87                         # Update the lifetime if the address has not changed
  88                         if [[ "${old_ip6_address}" = "${new_ip6_address}" ]]; then
  89                                 ipv6_address_change_lifetime "${new_ip6_address}/${new_ip6_prefixlen}" "${interface}" \
  90                                         --valid-lifetime="${new_max_life}" --preferred-lifetime="${new_preferred_life}"
  91
  92                                 exit ${EXIT_OK}
  93                         fi
  94
  95                         # Remove any old IP addresses
  96                         if [ -n "${old_ip6_address}" ]; then
  97                                 ipv6_address_del "${old_ip6_address}/${old_ip6_prefixlen}" "${interface}"
  98                         fi
  99
 100                         # Update the database
 101                         db_set "${interface}/ipv6/local-ip-address" \
 102                                 "${new_ip6_address}/${new_ip6_prefixlen}"
 103
 104                         # Add the new one
 105                         ipv6_address_add "${new_ip6_address}/${new_ip6_prefixlen}" "${interface}" \
 106                                 --valid-lifetime="${new_max_life}" --preferred-lifetime="${new_preferred_life}"
 107
 108                         exit ${EXIT_OK}
 109
 110                 # Handle Prefix Delegation
 111                 elif isset new_ip6_prefix || isset old_ip6_prefix; then
 112                         if [[ "${old_ip6_prefix}" = "${new_ip6_prefix}" ]]; then
 113                                 # TODO What do we need to do if the prefix hasn't changed?
 114                                 exit ${EXIT_OK}
 115                         fi
 116
 117                         log DEBUG "The delegated prefix has changed from ${old_ip6_prefix} to ${new_ip6_prefix}"
 118                         db_set "${interface}/ipv6/delegated-prefix" "${new_ip6_prefix}"
 119
 120                         exit ${EXIT_OK}
 121                 fi
 122                 ;;
 123
 124         DEPREF6)
 125                 # Check if all necessary information is there
 126                 if ! isset cur_ip6_address || ! isset cur_ip6_prefixlen; then
 127                         exit ${EXIT_ERROR}
 128                 fi
 129
 130                 # Set lifetime to zero
 131                 ipv6_address_change_lifetime "${cur_ip6_address}/${cur_ip6_prefixlen}" "${interface}" \
 132                         --preferred-lifetime=0 || exit ${EXIT_ERROR}
 133                 ;;
 134
 135         # IPv4
 136
 137         PREINIT)
 138                 # Bring up the device if it hasn't been done before.
 139                 if ! device_is_up ${interface}; then
 140                         log DEBUG "The interface '${interface}' does not appear to be up."
 141
 142                         zone_up ${interface}
 143                 fi
 144
 145                 # If the use configured a delay, we will honour that.
 146                 if [ -n "${DELAY}"  ]; then
 147                         assert isinteger DELAY
 148                         sleep ${DELAY}
 149
 150                 # If he didn't, we will try to detect is STP has brought the
 151                 # bridge up.
 152                 elif device_is_bridge ${interface}; then
 153                         counter=60
 154
 155                         while [ ${counter} -gt 0 ]; do
 156                                 # We may end this, when the bridge is in forwarding mode.
 157                                 if bridge_is_forwarding ${interface}; then
 158                                         log DEBUG "Bridge '${interface}' is in forwarding mode."
 159                                         break
 160                                 fi
 161
 162                                 counter=$(( ${counter} - 1 ))
 163                                 sleep 1
 164                         done
 165
 166                         # Tell the daemon, that we are not ready to go on.
 167                         if [ ${counter} -eq 0 ]; then
 168                                 log ERROR "Bridge '${interface}' is not in forwarding mode."
 169                                 log ERROR "Could not go on with getting a DHCP lease. Exiting."
 170
 171                                 exit 1
 172                         fi
 173                 fi
 174
 175                 exit 0
 176                 ;;
 177
 178         BOUND|RENEW|REBIND|REBOOT)
 179                 # Check if the IP address has changed. If so, delete all routes and stuff.
 180                 if [ -n "${old_ip_address}" -a "${old_ip_address}" != "${new_ip_address}" ]; then
 181                         ipv4_flush_device ${interface}
 182                 fi
 183
 184                 case "${reason}" in
 185                         BOUND|REBOOT)
 186                                 if [ ! "${old_ip_address}" = "${new_ip_address}" ] || \
 187                                         [ ! "${old_subnet_mask}" = "${new_subnet_mask}" ] || \
 188                                         [ ! "${old_network_number}" = "${new_network_number}" ] || \
 189                                         [ ! "${old_broadcast_address}" = "${new_broadcast_address}" ] || \
 190                                         [ ! "${old_routers}" = "${new_routers}" ] || \
 191                                         [ ! "${old_interface_mtu}" = "${new_interface_mtu}" ]; then
 192
 193
 194                                         # Calc a prefix out of address and subnet mask.
 195                                         new_prefix="$(ipv4_get_prefix ${new_ip_address} ${new_subnet_mask})"
 196
 197                                         # Set the new ip address.
 198                                         ip_address_add ${interface} ${new_ip_address}/${new_prefix}
 199                                         device_set_up ${interface}
 200
 201
 202                                         # A MTU of 576 is used for X.25 and dialup connections. Some broken DHCP
 203                                         # servers send out an MTU of 576 bytes, which will be ignored.
 204                                         if [ -n "${new_interface_mtu}" ] && [ ${new_interface_mtu} -gt 576 ]; then
 205                                                 device_set_mtu ${interface} ${new_interface_mtu}
 206                                         fi
 207
 208                                         # Save configuration
 209                                         db_set "${interface}/ipv4/type" "ipv4-dhcp"
 210                                         db_set "${interface}/ipv4/local-ip-address" \
 211                                                 "${new_ip_address}/${new_prefix}"
 212                                         db_set "${interface}/ipv4/remote-ip-address" "${new_routers}"
 213                                         db_set "${interface}/ipv4/active" 1
 214                                         db_set "${interface}/ipv4/domain-name" "${new_domain_name}"
 215                                         db_set "${interface}/ipv4/domain-name-servers" \
 216                                                 "${new_domain_name_servers}"
 217                                         db_set "${interface}/ipv4/domain-name-servers-priority" \
 218                                                 "${DNS_SERVER_DYNAMIC_PRIORITY}"
 219
 220                                         # Update the routing tables.
 221                                         routing_update ${interface} ipv4
 222                                         routing_default_update
 223
 224                                         # Update resolv.conf
 225                                         dns_generate_resolvconf
 226                                 fi
 227                                 ;;
 228                 esac
 229
 230                 exit 0
 231                 ;;
 232
 233         EXPIRE|FAIL|RELEASE|STOP)
 234                 # Remove the currently configured addresses from the device.
 235                 if [ -n "${old_ip_address}" ]; then
 236                         ipv4_flush_device ${interface}
 237                 fi
 238
 239                 db_delete "${interface}/ipv4"
 240                 routing_default_update
 241
 242                 exit 0
 243                 ;;
 244
 245         *)
 246                 log ERROR "Unhandled reason: ${reason}"
 247                 ;;
 248 esac
 249
 250 exit 1