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 "${interface}"
  43
  44                 # Disable autoconf because DHCP is handling this
  45                 ipv6_device_autoconf_disable "${interface}"
  46
  47                 # Enable forwarding because we are acting as a host
  48                 # to uplink network zones.
  49                 ipv6_device_forwarding_enable "${interface}" --accept-ra
  50
  51                 # Wait until DAD for the link-local address has finished
  52                 for address in $(ipv6_device_get_addresses "${interface}" --scope="link"); do
  53                         ipv6_wait_for_dad "${address}" "${interface}" && exit ${EXIT_OK}
  54                 done
  55
  56                 log ERROR "There is no active link-local address on ${interface}"
  57
  58                 exit ${EXIT_ERROR}
  59                 ;;
  60
  61         BOUND6)
  62                 # We will be called twice. Once for the assigned address and once for an assigned prefix.
  63
  64                 # Handle temporarily-assigned address
  65                 if isset new_ip6_address && isset new_ip6_prefixlen; then
  66                         ipv6_address_add "${new_ip6_address}/${new_ip6_prefixlen}" "${interface}" \
  67                                 --valid-lifetime="${new_max_life}" --preferred-lifetime="${new_preferred_life}"
  68
  69                         # Save configuration
  70                         db_set "${interface}/ipv6/local-ip-address" "${new_ip6_address}/${new_ip6_prefixlen}"
  71                         db_set "${interface}/ipv6/active" 1
  72                         #db_set "${interface}/ipv6/domain-name" "${new_
  73
  74                         # Update the routing tables
  75                         routing_update "${interface}" ipv6
  76
  77                         exit 0
  78
  79                 # Handle Prefix Delegation
  80                 elif isset new_ip6_prefix; then
  81                         db_set "${interface}/ipv6/delegated-prefix" "${new_ip6_prefix}"
  82
  83                         exit 0
  84                 fi
  85                 ;;
  86
  87         RENEW6|REBIND6)
  88                 # Will be called twice like BOUND6.
  89
  90                 if isset new_ip6_address && isset new_ip6_prefixlen; then
  91                         # Update nameservers if those have changed
  92                         if [[ "${old_dhcp6_name_servers}" != "${new_dhcp6_name_servers}" ]]; then
  93                                 db_set "${interface}/ipv6/domain-name-servers" "${new_dhcp6_name_servers}"
  94                                 dns_generate_resolvconf
  95                         fi
  96
  97                         # Update the lifetime if the address has not changed
  98                         if [[ "${old_ip6_address}" = "${new_ip6_address}" ]]; then
  99                                 ipv6_address_change_lifetime "${new_ip6_address}/${new_ip6_prefixlen}" "${interface}" \
 100                                         --valid-lifetime="${new_max_life}" --preferred-lifetime="${new_preferred_life}"
 101
 102                                 exit ${EXIT_OK}
 103                         fi
 104
 105                         # Remove any old IP addresses
 106                         if [ -n "${old_ip6_address}" ]; then
 107                                 ipv6_address_del "${old_ip6_address}/${old_ip6_prefixlen}" "${interface}"
 108                         fi
 109
 110                         # Update the database
 111                         db_set "${interface}/ipv6/local-ip-address" \
 112                                 "${new_ip6_address}/${new_ip6_prefixlen}"
 113
 114                         # Add the new one
 115                         ipv6_address_add "${new_ip6_address}/${new_ip6_prefixlen}" "${interface}" \
 116                                 --valid-lifetime="${new_max_life}" --preferred-lifetime="${new_preferred_life}"
 117
 118                         # Update the routing tables
 119                         routing_update "${interface}" ipv6
 120
 121                         exit ${EXIT_OK}
 122
 123                 # Handle Prefix Delegation
 124                 elif isset new_ip6_prefix || isset old_ip6_prefix; then
 125                         if [[ "${old_ip6_prefix}" = "${new_ip6_prefix}" ]]; then
 126                                 # TODO What do we need to do if the prefix hasn't changed?
 127                                 exit ${EXIT_OK}
 128                         fi
 129
 130                         log DEBUG "The delegated prefix has changed from ${old_ip6_prefix} to ${new_ip6_prefix}"
 131                         db_set "${interface}/ipv6/delegated-prefix" "${new_ip6_prefix}"
 132
 133                         exit ${EXIT_OK}
 134                 fi
 135                 ;;
 136
 137         DEPREF6)
 138                 # Check if all necessary information is there
 139                 if ! isset cur_ip6_address || ! isset cur_ip6_prefixlen; then
 140                         exit ${EXIT_ERROR}
 141                 fi
 142
 143                 # Set lifetime to zero
 144                 ipv6_address_change_lifetime "${cur_ip6_address}/${cur_ip6_prefixlen}" "${interface}" \
 145                         --preferred-lifetime=0 || exit ${EXIT_ERROR}
 146                 ;;
 147
 148         EXPIRE6|FAIL6|RELEASE6|STOP6)
 149                 # Remove the currently configured addresses from the device.
 150                 ipv6_address_flush "${interface}"
 151
 152                 # Reset autoconf mode and disable forwarding
 153                 ipv6_device_forwarding_disable "${interface}"
 154                 ipv6_device_autoconf_disable "${interface}"
 155
 156                 db_delete "${interface}/ipv6"
 157
 158                 exit 0
 159                 ;;
 160
 161         # IPv4
 162
 163         PREINIT)
 164                 # Bring up the device if it hasn't been done before.
 165                 if ! device_is_up ${interface}; then
 166                         log DEBUG "The interface '${interface}' does not appear to be up."
 167
 168                         zone_up ${interface}
 169                 fi
 170
 171                 # If the use configured a delay, we will honour that.
 172                 if [ -n "${DELAY}"  ]; then
 173                         assert isinteger DELAY
 174                         sleep ${DELAY}
 175
 176                 # If he didn't, we will try to detect is STP has brought the
 177                 # bridge up.
 178                 elif device_is_bridge ${interface}; then
 179                         counter=60
 180
 181                         while [ ${counter} -gt 0 ]; do
 182                                 # We may end this, when the bridge is in forwarding mode.
 183                                 if bridge_is_forwarding ${interface}; then
 184                                         log DEBUG "Bridge '${interface}' is in forwarding mode."
 185                                         break
 186                                 fi
 187
 188                                 counter=$(( ${counter} - 1 ))
 189                                 sleep 1
 190                         done
 191
 192                         # Tell the daemon, that we are not ready to go on.
 193                         if [ ${counter} -eq 0 ]; then
 194                                 log ERROR "Bridge '${interface}' is not in forwarding mode."
 195                                 log ERROR "Could not go on with getting a DHCP lease. Exiting."
 196
 197                                 exit 1
 198                         fi
 199                 fi
 200
 201                 exit 0
 202                 ;;
 203
 204         BOUND|RENEW|REBIND|REBOOT)
 205                 # Check if the IP address has changed. If so, delete all routes and stuff.
 206                 if [ -n "${old_ip_address}" -a "${old_ip_address}" != "${new_ip_address}" ]; then
 207                         ipv4_flush_device ${interface}
 208                 fi
 209
 210                 case "${reason}" in
 211                         BOUND|REBOOT)
 212                                 if [ ! "${old_ip_address}" = "${new_ip_address}" ] || \
 213                                         [ ! "${old_subnet_mask}" = "${new_subnet_mask}" ] || \
 214                                         [ ! "${old_network_number}" = "${new_network_number}" ] || \
 215                                         [ ! "${old_broadcast_address}" = "${new_broadcast_address}" ] || \
 216                                         [ ! "${old_routers}" = "${new_routers}" ] || \
 217                                         [ ! "${old_interface_mtu}" = "${new_interface_mtu}" ]; then
 218
 219
 220                                         # Calc a prefix out of address and subnet mask.
 221                                         new_prefix="$(ipv4_get_prefix ${new_ip_address} ${new_subnet_mask})"
 222
 223                                         # Set the new ip address.
 224                                         ip_address_add ${interface} ${new_ip_address}/${new_prefix}
 225                                         device_set_up ${interface}
 226
 227
 228                                         # A MTU of 576 is used for X.25 and dialup connections. Some broken DHCP
 229                                         # servers send out an MTU of 576 bytes, which will be ignored.
 230                                         if [ -n "${new_interface_mtu}" ] && [ ${new_interface_mtu} -gt 576 ]; then
 231                                                 device_set_mtu ${interface} ${new_interface_mtu}
 232                                         fi
 233
 234                                         # Save configuration
 235                                         db_set "${interface}/ipv4/type" "ipv4-dhcp"
 236                                         db_set "${interface}/ipv4/local-ip-address" \
 237                                                 "${new_ip_address}/${new_prefix}"
 238                                         db_set "${interface}/ipv4/remote-ip-address" "${new_routers}"
 239                                         db_set "${interface}/ipv4/active" 1
 240                                         db_set "${interface}/ipv4/domain-name" "${new_domain_name}"
 241                                         db_set "${interface}/ipv4/domain-name-servers" \
 242                                                 "${new_domain_name_servers}"
 243                                         db_set "${interface}/ipv4/domain-name-servers-priority" \
 244                                                 "${DNS_SERVER_DYNAMIC_PRIORITY}"
 245
 246                                         # Update the routing tables.
 247                                         routing_update ${interface} ipv4
 248                                         routing_default_update
 249
 250                                         # Update resolv.conf
 251                                         dns_generate_resolvconf
 252                                 fi
 253                                 ;;
 254                 esac
 255
 256                 exit 0
 257                 ;;
 258
 259         EXPIRE|FAIL|RELEASE|STOP)
 260                 # Remove the currently configured addresses from the device.
 261                 if [ -n "${old_ip_address}" ]; then
 262                         ipv4_flush_device ${interface}
 263                 fi
 264
 265                 db_delete "${interface}/ipv4"
 266                 routing_default_update
 267
 268                 exit 0
 269                 ;;
 270
 271         *)
 272                 log ERROR "Unhandled reason: ${reason}"
 273                 ;;
 274 esac
 275
 276 exit 1