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Modify the behaviour of --synth-domain for IPv6.

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When deriving a domain name from an IPv6 address, an address
such as 1234:: would become 1234--.example.com, which is
not legal in IDNA2008. Stop using the :: compression method,
so 1234:: becomes
1234-0000-0000-0000-0000-0000-0000-0000.example.com
This commit is contained in:
Simon Kelley
2024-11-27 23:12:41 +00:00
parent 41d2ae3203
commit a8088e331a
4 changed files with 33 additions and 43 deletions
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11
man/dnsmasq.8
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@@ -769,12 +769,11 @@ results in the name internal-0.thekelleys.org.uk. returning 192.168.0.50, intern
Second,
.B --synth-domain=thekelleys.org.uk,192.168.0.0/24,internal- (no *)
will result in a query for internal-192-168-0-56.thekelleys.org.uk returning
192.168.0.56 and a reverse query vice versa. The same applies to IPv6,
but IPv6 addresses may start with '::'
but DNS labels may not start with '-' so in this case if no prefix is
configured a zero is added in front of the label. ::1 becomes 0--1.
V4 mapped IPv6 addresses, which have a representation like ::ffff:1.2.3.4 are handled specially, and become like 0--ffff-1-2-3-4
192.168.0.56 and a reverse query vice versa. The same applies to IPv6;
the representation doesn't use the :: compression feature or
the special representation of V4 mapped IPv6 addresses as these
can generate illegal domain names, so all domains are of the form
internal-1000-0000-0000-0000-0000-0000-0000-0008.example.com
The address range can be of the form
<start address>,<end address> or <ip address>/<prefix-length> in both forms of the option. For IPv6 the start and end addresses