[Buildroot] [git commit] busybox: Enable domain search list support in udhcpc

Peter Korsgaard peter at korsgaard.com
Sat Aug 3 15:49:54 UTC 2019


commit: https://git.buildroot.net/buildroot/commit/?id=80291c3e9c591ee8cfb9262523cd5151ed0b747a
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

This is useful in networks with internal resources as it allows
to use much shorter names.

E.g. instead of "server.internal.company.com" it's possible
to use just "server" if DHCP server is configured with:
---------------------------->8-----------------------
option domain-search "internal.company.com";
---------------------------->8-----------------------

This improvement consists of 2 parts:

1. Enable handling of RFC3397 so DHCP client is ready for processing
   corresponding data from DHCP server.

2. Some DHCP servers always send out search list if it is set in server's
   configuration and some servers only provide search list if client
   asks for that (sending list of options it expects to get).

   And exactly for those stubborn DHCP servers we need to add "-O search"
   to udhcp's command line via CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS.

Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
Cc: Ignacy Gawedzki <ignacy.gawedzki at green-communications.fr>
Cc: Peter Korsgaard <peter at korsgaard.com>
Acked-by: Yann E. MORIN <yann.morin.1998 at free.fr>
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/busybox/busybox.config | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/package/busybox/busybox.config b/package/busybox/busybox.config
index c28718a725..1ea810e5be 100644
--- a/package/busybox/busybox.config
+++ b/package/busybox/busybox.config
@@ -968,9 +968,9 @@ CONFIG_UDHCPC_DEFAULT_SCRIPT="/usr/share/udhcpc/default.script"
 # CONFIG_FEATURE_UDHCP_PORT is not set
 CONFIG_UDHCP_DEBUG=0
 CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS=80
-# CONFIG_FEATURE_UDHCP_RFC3397 is not set
+CONFIG_FEATURE_UDHCP_RFC3397=y
 CONFIG_FEATURE_UDHCP_8021Q=y
-CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -n"
+CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -n -O search"
 
 #
 # Print Utilities


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