Package: dhcp3-client
Severity: wishlist
On Tue, Jun 14, 2005 at 01:10:31PM -0400, Joey Hess wrote:
> Andrew Pollock wrote:
> > So, before we go doing this and breaking things, I thought it best to give
> > people a bit of notice. My understanding is that dhcp3-client is too large,
> > so maybe something like udhcpc (or apparently klibc has a DHCP client)
> > instead?
>
> udhcp and pump have proven to be broken in the past. I tried again to
> fit the dhcp3 udeb onto our floppy, but that image, which has 93k free
> with the dhcp2 udeb, gets over-full with the dhcp3 one. That 100k
> (compressed; 300k uncompressed!) size difference is pretty amazing.
:-(
> BTW, d-i currently contains a forked version of
> /etc/dhcp3/dhclient-script (and/or /etc/dhclient-script). The changes are:
>
> * Runs under /bin/sh; does not need bash.
> * Runs set -e, probaly so we can detect when it fails.
> * Some XSI-isms fixed, although I don't know that that really matters
> for d-i.
> * Doesn't depend on the hostname command, since d-i lacks one.
> * Ripped out some stuff that is not appropriate for d-i, or to save
> space, including support for setting multiple nameservers and keeping old
> nameservers, all the hook code
> * Uses ip command, not ifconfig. We've been planning to drop ifconfig
> from d-i, though it's not happened yet.
> * Some other changes that I don't understand very well, like it uses a
> ptom command instead of netmask.
> * A very nasty hack to omminicate the dhcp hostname on to netcfg.
> * Probably some changes that have not been kept up to date since the
> fork, for example, the fix for #144666 may not be included.
>
> I've attached a full diff, I hope we can find a way to merge these or at
> least make the diff smaller, and this really belongs in the udeb(s) for
> the dhcp client, not in d-i itself.
Okay, I don't see why this can't live in a patch in the dhcp3 source that is
applied to produce the dhcp3-client udeb.
> --
> see shy jo
> --- /etc/dhcp3/dhclient-script 2005-03-03 03:10:44.000000000 -0500
> +++ dhclient-script 2005-05-13 16:55:43.000000000 -0400
> @@ -1,134 +1,57 @@
> -#!/bin/bash
> +#!/bin/sh
> +
> +set -e
> +
> +# reduced dhclient-script for the Debian installer
> +# changes by Joshua Kwan <[EMAIL PROTECTED]>,
> +# Bastian Blank <[EMAIL PROTECTED]>
>
> # dhclient-script for Linux. Dan Halbert, March, 1997.
> # Updated for Linux 2.[12] by Brian J. Murrell, January 1999.
> # Modified for Debian. Matt Zimmerman and Eloy Paris, December 2003
> -# Modified to remove useless tests for antiquated kernel versions that
> -# this doesn't even work with anyway, and introduces a dependency on /usr
> -# being mounted, which causes cosmetic errors on hosts that NFS mount /usr
> -# Andrew Pollock, February 2005
> -
> -# The alias handling in here probably still sucks. -mdz
>
> make_resolv_conf() {
> - if [ -n "$new_domain_name" -o -n "$new_domain_name_servers" ]; then
> + if [ -n "$new_domain_name" ] || [ -n "$new_domain_name_servers" ]; then
> local new_resolv_conf=/etc/resolv.conf.dhclient-new
> rm -f $new_resolv_conf
> if [ -n "$new_domain_name" ]; then
> - echo search $new_domain_name >>$new_resolv_conf
> - fi
> - if [ -n "$new_domain_name_servers" ]; then
> - for nameserver in $new_domain_name_servers; do
> - echo nameserver $nameserver >>$new_resolv_conf
> - done
> - else # keep 'old' nameservers
> - sed -n /^\w*[Nn][Aa][Mm][Ee][Ss][Ee][Rr][Vv][Ee][Rr]/p
> /etc/resolv.conf >>$new_resolv_conf
> + echo "search $new_domain_name" >>$new_resolv_conf
> fi
> - chown --reference=/etc/resolv.conf $new_resolv_conf
> - chmod --reference=/etc/resolv.conf $new_resolv_conf
> - mv $new_resolv_conf /etc/resolv.conf
> - fi
> -}
> -
> -run_hook() {
> - local script="$1"
> - local exit_status
> -
> - if [ -f $script ]; then
> - . $script
> - fi
> -
> -
> - if [ -n "$exit_status" ] && [ "$exit_status" -ne 0 ]; then
> - logger -p daemon.err "$script returned non-zero exit status
> $exit_status"
> - save_exit_status=$exit_status
> - fi
> -
> - return $exit_status
> -}
> -
> -run_hookdir() {
> - local dir="$1"
> - local exit_status
> -
> - if [ -d "$dir" ]; then
> - for script in $(run-parts --list $dir); do
> - run_hook $script || true
> - exit_status=$?
> + for nameserver in $new_domain_name_servers; do
> + echo "nameserver $nameserver" >>$new_resolv_conf
> done
> + mv $new_resolv_conf /etc/resolv.conf
> fi
> -
> - return $exit_status
> -}
> -
> -# Must be used on exit. Invokes the local dhcp client exit hooks, if any.
> -exit_with_hooks() {
> - exit_status=$1
> -
> - # Source the documented exit-hook script, if it exists
> - if ! run_hook /etc/dhcp3/dhclient-exit-hooks; then
> - exit_status=$?
> - fi
> -
> - # Now run scripts in the Debian-specific directory.
> - if ! run_hookdir /etc/dhcp3/dhclient-exit-hooks.d; then
> - exit_status=$?
> - fi
> -
> - exit $exit_status
> }
>
> set_hostname() {
> - local current_hostname=$(hostname)
> - if [ -z "$current_hostname" -o "$current_hostname" = "(none)" ]; then
> - hostname "$new_host_name"
> + local current_hostname=$(cat /proc/sys/kernel/hostname)
> + if [ -z "$current_hostname" ] || [ "$current_hostname" = "(none)" ]; then
> + echo "$new_host_name" > /proc/sys/kernel/hostname
> fi
> }
>
> -if [ -n "$new_broadcast_address" ]; then
> - new_broadcast_arg="broadcast $new_broadcast_address"
> -fi
> -if [ -n "$old_broadcast_address" ]; then
> - old_broadcast_arg="broadcast $old_broadcast_address"
> -fi
> if [ -n "$new_subnet_mask" ]; then
> - new_subnet_arg="netmask $new_subnet_mask"
> + new_mask="/$(ptom $new_subnet_mask)"
> fi
> if [ -n "$old_subnet_mask" ]; then
> - old_subnet_arg="netmask $old_subnet_mask"
> + old_mask="/$(ptom $old_subnet_mask)"
> fi
> -if [ -n "$alias_subnet_mask" ]; then
> - alias_subnet_arg="netmask $alias_subnet_mask"
> -fi
> -if [ -n "$new_interface_mtu" ]; then
> - mtu_arg="mtu $new_interface_mtu"
> +
> +if [ -n "$new_broadcast_address" ]; then
> + new_broadcast_arg="broadcast $new_broadcast_address"
> fi
> -if [ -n "$IF_METRIC" ]; then
> - metric_arg="metric $IF_METRIC" # interfaces(5), "metric" option
> +if [ -n "$old_broadcast_address" ]; then
> + old_broadcast_arg="broadcast $old_broadcast_address"
> fi
> -
> -
> -# The action starts here
> -
> -# Invoke the local dhcp client enter hooks, if they exist.
> -run_hook /etc/dhcp3/dhclient-enter-hooks
> -run_hookdir /etc/dhcp3/dhclient-enter-hooks.d
> -
> +
> # Execute the operation
> case "$reason" in
> MEDIUM|ARPCHECK|ARPSEND)
> # Do nothing
> ;;
> PREINIT)
> - # The DHCP client is requesting that an interface be
> - # configured as required in order to send packets prior to
> - # receiving an actual address. - dhclient-script(8)
> -
> - if [ -n "$alias_ip_address" ]; then
> - # Bring down alias interface. Its routes will disappear too.
> - ifconfig $interface:0- inet 0
> - fi
> - ifconfig $interface 0 up
> + ip link set $interface up
>
> # We need to give the kernel some time to get the interface up.
> sleep 1
> @@ -137,90 +60,50 @@
>
> set_hostname
>
> - if [ -n "$old_ip_address" -a -n "$alias_ip_address" -a \
> - "$alias_ip_address" != "$old_ip_address" ]; then
> - # Possible new alias. Remove old alias.
> - ifconfig $interface:0- inet 0
> - fi
> -
> - if [ -n "$old_ip_address" -a \
> - "$old_ip_address" != "$new_ip_address" ]; then
> + if [ -n "$old_ip_address" ] && \
> + [ "$old_ip_address" != "$new_ip_address" ]; then
> # IP address changed. Bringing down the interface will delete
> all routes,
> # and clear the ARP cache.
> - ifconfig $interface inet 0 down
> + ip addr del $old_ip_address$old_mask $old_broadcast_arg dev
> $interface
> + ip link set $interface down
> + fi
>
> + if [ -n "$new_interface_mtu" ]; then
> + ip link set $interface mtu $new_interface_mtu || true
> fi
>
> - if [ -z "$old_ip_address" -o "$old_ip_address" != "$new_ip_address"
> -o \
> - "$reason" = "BOUND" -o "$reason" = "REBOOT" ]; then
> + if [ -z "$old_ip_address" ] || [ "$old_ip_address" !=
> "$new_ip_address" ] || \
> + [ "$reason" = "BOUND" ] || [ "$reason" = "REBOOT" ]; then
>
> - ifconfig $interface inet $new_ip_address $new_subnet_arg \
> - $new_broadcast_arg $mtu_arg
> + ip link set $interface up
> + ip addr flush dev $interface
> + ip addr add $new_ip_address$new_mask $new_broadcast_arg dev
> $interface
>
> for router in $new_routers; do
> - route add default dev $interface gw $router $metric_arg
> + ip route add default via $router
> done
> fi
>
> - if [ "$new_ip_address" != "$alias_ip_address" -a -n
> "$alias_ip_address" ];
> - then
> - ifconfig $interface:0- inet 0
> - ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
> - route add -host $alias_ip_address $interface:0
> - fi
> -
> make_resolv_conf
>
> + # Get the domain name into a file suitable for netcfg to read.
> + echo -n "$new_domain_name" > /tmp/domain_name
> +
> ;;
>
> EXPIRE|FAIL|RELEASE|STOP)
> - if [ -n "$alias_ip_address" ]; then
> - # Turn off alias interface.
> - ifconfig $interface:0- inet 0
> - fi
> -
> if [ -n "$old_ip_address" ]; then
> # Shut down interface, which will delete routes and clear arp
> cache.
> - ifconfig $interface inet 0 down
> - fi
> -
> - if [ -n "$alias_ip_address" ]; then
> - ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
> - route add -host $alias_ip_address $interface:0
> + ip addr flush dev $interface
> + ip link set $interface down
> fi
>
> ;;
>
> TIMEOUT)
> - if [ -n "$alias_ip_address" ]; then
> - ifconfig $interface:0- inet 0
> - fi
> -
> - ifconfig $interface inet $new_ip_address $new_subnet_arg \
> - $new_broadcast_arg $mtu_arg
> -
> - set -- $new_routers
> - first_router="$1"
> -
> - if ping -q -c 1 $first_router; then
> - if [ "$new_ip_address" != "$alias_ip_address" -a \
> - -n "$alias_ip_address" ]; then
> - ifconfig $interface:0 inet $alias_ip_address
> $alias_subnet_arg
> - route add -host $alias_ip_address dev $interface:0
> - fi
> -
> - for router in $new_routers; do
> - route add default dev $interface gw $router $metric_arg
> - done
> -
> - make_resolv_conf
> - else
> - # Changed from 'ifconfig $interface inet 0 down' - see Debian
> bug #144666
> - ifconfig $interface inet 0
> - exit_with_hooks 2
> - fi
> + ip link set $interface down
>
> ;;
> esac
>
> -exit_with_hooks 0
> +exit 0
--
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