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DHCPCD-RUN-HOOKS

Section: Maintenance Commands (8)
Index Return to Main Contents

BSD mandoc
 

NAME

dhcpcd-run-hooks - DHCP client configuration script  

DESCRIPTION

is used by dhcpcd(8) to run any system and user defined hook scripts. System hook scripts are found in /lib/dhcpcd/dhcpcd-hooks and the user defined hooks are /etc/dhcpcd.enter-hook and /etc/dhcpcd.exit-hook The default install supplies hook scripts for configuring /etc/resolv.conf and the hostname. Your distribution may have included other hook scripts to say configure ntp or ypbind. A test hook is also supplied that simply echos the dhcp variables to the console from DISCOVER message.

Each time is invoked, $interface is set to the interface that dhcpcd is run on and $reason is to the reason why was invoked. DHCP information to be configured is held in variables starting with the word new_ and old DHCP information to be removed is held in variables starting with the word old_. dhcpcd can display the full list of variables it knows how about by using the -V , -variables argument.

Here's a list of reasons why could be invoked:

PREINIT
dhcpcd is starting up and any pre-initialisation should be done.
CARRIER
dhcpcd has detected the carrier is up. This is generally just a notification and no action need be taken.
NOCARRIER
dhcpcd lost the carrier. The cable may have been unplugged or association to the wireless point lost.
INFORM | INFORM6
dhcpcd informed a DHCP server about it's address and obtained other configuration details.
BOUND | BOUND6
dhcpcd obtained a new lease from a DHCP server.
RENEW | RENEW6
dhcpcd renewed it's lease.
REBIND | REBIND6
dhcpcd has rebound to a new DHCP server.
REBOOT | REBOOT6
dhcpcd successfully requested a lease from a DHCP server.
DELEGATED6
dhcpcd assigned a delegated prefix to the interface.
IPV4LL
dhcpcd failed to contact any DHCP servers but did obtain an IPV4LL address.
STATIC
dhcpcd has been configured with a static configuration which has not been obtained from a DHCP server.
3RDPARTY
dhcpcd is monitoring the interface for a 3rd party to give it an IP address.
TIMEOUT
dhcpcd failed to contact any DHCP servers but was able to use an old lease.
EXPIRE | EXPIRE6
dhcpcd's lease or state expired and it failed to obtain a new one.
NAK
dhcpcd received a NAK from the DHCP server. This should be treated as EXPIRE.
RECONFIGURE
dhcpcd has been instructed to reconfigure an interface.
ROUTERADVERT
dhcpcd has received an IPv6 Router Advertisment, or one has expired.
STOP | STOP6
dhcpcd stopped running on the interface.
STOPPED
dhcpcd has stopped entirely.
DEPARTED
The interface has been removed.
FAIL
dhcpcd failed to operate on the interface. This normally happens when dhcpcd does not support the raw interface, which means it cannot work as a DHCP or ZeroConf client. Static configuration and DHCP INFORM is still allowed.
DUMP
dhcpcd has been asked to dump the last lease for the interface.
TEST
dhcpcd received an OFFER from a DHCP server but will not configure the interface. This is primarily used to test the variables are filled correctly for the script to process them.

 

ENVIRONMENT

dhcpcd will clear the environment variables aside from $PATH and $RC_SVCNAME The following variables will then be set, along with any protocol supplied ones.

$interface
the name of the interface.
$reason
as described above.
$pid
the pid of dhcpcd
$ifcarrier
the link status of $interface unknown up or down
$ifmetric
$interface preference, lower is better.
$ifwireless
1 if $interface is wireless, otherwise 0
$ifflags
$interface flags.
$ifmtu
$interface MTU.
$ifssid
the name of the SSID the interface is connected to.
$interface_order
A list of interfaces, in order of preference.
$if_up
true if the interface is up, otherwise false
$if_down
true if the interface is down, otherwise false
$if_oneup
true if any interface is up, otherwise false.
$if_ipwaited
true if any interface has been assigned an IP address which matches any wait requirements specified in dhcpcd.conf5.
$profile
the name of the profile selected from dhcpcd.conf5.
$new_delegated_dhcp6_prefix
space separated list of delegated prefixes.

 

FILES

When runs, it loads /etc/dhcpcd.enter-hook and any scripts found in /lib/dhcpcd/dhcpcd-hooks in a lexical order and then finally /etc/dhcpcd.exit-hook  

SEE ALSO

dhcpcd(8)  

AUTHORS

An Roy Marples Aq Mt roy@marples.name  

BUGS

Please report them to Lk http://roy.marples.name/projects/dhcpcd  

SECURITY CONSIDERATIONS

dhcpcd will validate the content of each option against its encoding. For string, ascii, raw or binhex encoding it's up to the user to validate it for the intended purpose.

When used in a shell script, each variable must be quoted correctly.


 

Index

NAME
DESCRIPTION
ENVIRONMENT
FILES
SEE ALSO
AUTHORS
BUGS
SECURITY CONSIDERATIONS


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