On Thu, 22 Sept 2022 at 13:31, Luca Boccassi <bl...@debian.org> wrote:
>
> On Tue, 2022-08-30 at 22:41 +0100, bl...@debian.org wrote:
> > From: Luca Boccassi <bl...@debian.org>
> >
> > It is useful for applications to be able to query DHCP options
> > without renewing IP address. Instead of a full DHCP handshake,
> > using -I will cause a single DHCPINFORM packet to be sent, and
> > the server response (including DHCP options received) to be
> > printed and terminate. No configuration will be changed.
> >
> > This is useful for clients that want to query additional information
> > from a server, that might not be normally processed, like custom
> > server options. Also useful for checking specific options via -O.
> >
> > As per RFC 2131, allow targeting the already-known DHCP server via
> > unicast instead of broadcast, via new -e option.
> >
> > Tested by running isc-dhcp-server with the following configuration:
> >
> > option domain-name "example.org";
> > option domain-name-servers 1.1.1.1, 8.8.8.8;
> > subnet 192.168.11.0 netmask 255.255.255.0 {
> > range 192.168.11.1 192.168.11.100;
> > authoritative;
> > option default-url "default.url";
> > }
> >
> > $ busybox udhcpc -I -i host0 -O 114 -r 192.168.11.1
> > udhcpc: started, v1.36.0.git
> > udhcpc: broadcasting inform for 192.168.11.1, server 0.0.0.0
> > udhcpc: lease of 0.0.0.0 obtained from 0.0.0.0, lease time 3600 (default)
> > udhcpc: option: opt53=0x05
> > udhcpc: option: serverid=192.168.11.101
> > udhcpc: option: subnet=255.255.255.0
> > udhcpc: option: dns=1.1.1.1 8.8.8.8
> > udhcpc: option: domain=example.org
> > udhcpc: option: opt114=0x64656661756c742e75726c
> >
> > $ busybox udhcpc -e 192.168.11.101 -I -i host0 -O 114 -r 192.168.11.1
> > udhcpc: started, v1.36.0.git
> > udhcpc: unicasting inform for 192.168.11.1, server 192.168.11.101
> > udhcpc: lease of 0.0.0.0 obtained from 192.168.11.101, lease time 3600
> > (default)
> > udhcpc: option: opt53=0x05
> > udhcpc: option: serverid=192.168.11.101
> > udhcpc: option: subnet=255.255.255.0
> > udhcpc: option: dns=1.1.1.1 8.8.8.8
> > udhcpc: option: domain=example.org
> > udhcpc: option: opt114=0x64656661756c742e75726c
> >
> > Co-authored-by: Sinan Kaya <ok...@kernel.org>
> > Signed-off-by: Luca Boccassi <bl...@debian.org>
> > ---
> > v2: updated commit message and comments
> > applied all review comments
> > print received DHCP options and exit
> >
> > networking/udhcp/dhcpc.c | 116 ++++++++++++++++++++++++++++++++++-----
> > 1 file changed, 103 insertions(+), 13 deletions(-)
>
> Hello Denys,
>
> Any chance for a second review? Thank you!
Hello,
One more ping for a re-review. Thank you!
Kind regards,
Luca Boccassi
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