Hi,
I have a buster system configured as a DC running 4.11.13 from Louis's
repo.
I am trying to get https://wiki.samba.org/index.php/Configure_DHCP_to_update_DNS_records_with_BIND9
working. Mostly it seems to work but there seems to be a problem with what
dhcpd writes into the leases file in the "on release" stanza.
When dhcpd writes the On Release stanza I get something like the following:
lease 172.30.1.40 {
starts 0 2020/10/04 22:08:55;
ends 0 2020/10/04 22:38:55;
tstp 0 2020/10/04 22:38:55;
cltt 0 2020/10/04 22:08:55;
binding state active;
next binding state free;
rewind binding state free;
hardware ethernet c8:1f:66:08:dd:49;
uid "\001\310\037f\010\335I";
set vendor-class-identifier = "MSFT 5.0";
set noname = "dhcp-172-30-1-40";
set ClientIP = "172.30.1.40";
set ClientDHCID = "c8:1f:66:08:dd:49";
set ClientName = "MB-DISPATCH-20";
client-hostname "MB-DISPATCH-20";
on expiry {
set ClientIP =
binary-to-ascii (10, 8, ".", leased-address) ;
log (debug,
concat ("Expired: IP: ", ClientIP));
execute ("/usr/local/bin/dhcp-dyndns.sh", "delete", ClientIP, "", "0");
}
on release {
set ClientIP =
binary-to-ascii (10, 8, ".", leased-address) ;
set ClientDHCID =
concat (concat (concat (concat (concat (concat (concat (concat (concat (
concat
(
suffix
(
concat
(
"0",
binary-to-ascii
(16
,
8,
""
,
substring
(
hardware,
1,
1)
))
,
2)
,
":")
,
suffix
(
concat
(
"0",
binary-to-ascii
(16
,
8,
""
,
substring
(
hardware,
2,
1)
))
,
2)
), ":"),
suffix (concat (
"0",
binary-to-ascii
(16
,
8,
""
,
substring
(
hardware,
3,
1)
))
, 2)),
":"),
suffix (concat ("0",
binary-to-ascii
(16, 8, "",
substring (
hardware,
4, 1))), 2)),
":"),
suffix (concat ("0",
binary-to-ascii (16, 8, "",
substring (
hardware,
5, 1))), 2)),
":"),
suffix (concat ("0",
binary-to-ascii (16, 8, "",
substring (hardware, 6, 1))), 2
)) ;
log (debug,
concat ("Release: IP: ", ClientIP));
execute ("/usr/local/bin/dhcp-dyndns.sh", "delete", ClientIP, ClientDHCID);
}
}
I have the following in the dhcpd.conf file:
on commit {
set noname = concat("dhcp-", binary-to-ascii(10, 8, "-", leased-address));
set ClientIP = binary-to-ascii(10, 8, ".", leased-address);
set ClientDHCID = concat (
suffix (concat ("0", binary-to-ascii (16, 8, "", substring(hardware,1,1))),2), ":",
suffix (concat ("0", binary-to-ascii (16, 8, "", substring(hardware,2,1))),2), ":",
suffix (concat ("0", binary-to-ascii (16, 8, "", substring(hardware,3,1))),2), ":",
suffix (concat ("0", binary-to-ascii (16, 8, "", substring(hardware,4,1))),2), ":",
suffix (concat ("0", binary-to-ascii (16, 8, "", substring(hardware,5,1))),2), ":",
suffix (concat ("0", binary-to-ascii (16, 8, "", substring(hardware,6,1))),2)
);
set ClientName = pick-first-value(option host-name, config-option-host-name, client-name, noname);
log(concat("Commit: IP: ", ClientIP, " DHCID: ", ClientDHCID, " Name: ", ClientName));
execute("/usr/local/bin/dhcp-dyndns.sh", "add", ClientIP, ClientDHCID, ClientName);
}
on release {
set ClientIP = binary-to-ascii(10, 8, ".", leased-address);
set ClientDHCID = concat (
suffix (concat ("0", binary-to-ascii (16, 8, "", substring(hardware,1,1))),2), ":",
suffix (concat ("0", binary-to-ascii (16, 8, "", substring(hardware,2,1))),2), ":",
suffix (concat ("0", binary-to-ascii (16, 8, "", substring(hardware,3,1))),2), ":",
suffix (concat ("0", binary-to-ascii (16, 8, "", substring(hardware,4,1))),2), ":",
suffix (concat ("0", binary-to-ascii (16, 8, "", substring(hardware,5,1))),2), ":",
suffix (concat ("0", binary-to-ascii (16, 8, "", substring(hardware,6,1))),2)
);
log(concat("Release: IP: ", ClientIP));
execute("/usr/local/bin/dhcp-dyndns.sh", "delete", ClientIP, ClientDHCID);
}
on expiry {
set ClientIP = binary-to-ascii(10, 8, ".", leased-address);
# cannot get a ClientMac here, apparently this only works when actually receiving a packet
log(concat("Expired: IP: ", ClientIP));
# cannot get a ClientName here, for some reason that always fails
execute("/usr/local/bin/dhcp-dyndns.sh", "delete", ClientIP, "", "0");
}
Can someone see what I am doing wrong?
Is there a way to debug this?
Regards,
--
Tom me at tdiehl.org