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Allow wildcards in domain patterns.

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Domain patterns in --address, --server and --local have, for many years,
matched complete labels only, so
--server=/google.com/1.2.3.4
will apply to google.com and www.google.com but NOT supergoogle.com

This commit introduces an optional '*' at the LHS of the domain string which
changes this behaviour so as to include substring matches _within_ labels. So,
--server=/*google.com/1.2.3.4
applies to google.com, www.google.com AND supergoogle.com.
This commit is contained in:
Simon Kelley
2021-07-01 22:28:24 +01:00
parent 4205e2ebcf
commit 5e95c16c32
4 changed files with 84 additions and 27 deletions
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man/dnsmasq.8
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@@ -460,13 +460,22 @@ repeated domain or ipaddr parts as required.
More specific domains take precedence over less specific domains, so:
.B --server=/google.com/1.2.3.4
.B --server=/www.google.com/2.3.4.5
will send queries for *.google.com to 1.2.3.4, except *www.google.com,
which will go to 2.3.4.5
will send queries for google.com and gmail.google.com to 1.2.3.4, but www.google.com
will go to 2.3.4.5
Matching of domains is normally done on complete labels, so /google.com/ matches google.com and www.google.com
but NOT supergoogle.com. This can be overridden with a * at the start of a pattern only: /*google.com/
will match google.com and www.google.com AND supergoogle.com. The non-wildcard form has priority, so
if /google.com/ and /*google.com/ are both specified then google.com and www.google.com will match /google.com/
and /*google.com/ will only match supergoogle.com.
For historical reasons, the pattern /.google.com/ is equivalent to /google.com/ if you wish to match any subdomain
of google.com but NOT google.com itself, use /*.google.com/
The special server address '#' means, "use the standard servers", so
.B --server=/google.com/1.2.3.4
.B --server=/www.google.com/#
will send queries for *.google.com to 1.2.3.4, except *www.google.com which will
will send queries for google.com and its subdomains to 1.2.3.4, except www.google.com (and its subdomains) which will
be forwarded as usual.
Also permitted is a -S