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Major rewrite of the DNS server and domain handling code.

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This should be largely transparent, but it drastically
improves performance and reduces memory foot-print when
configuring large numbers domains of the form
local=/adserver.com/
or
local=/adserver.com/#

Lookup times now grow as log-to-base-2 of the number of domains,
rather than greater than linearly, as before.
The change makes multiple addresses associated with a domain work
address=/example.com/1.2.3.4
address=/example.com/5.6.7.8
It also handles multiple upstream servers for a domain better; using
the same try/retry alogrithms as non domain-specific servers. This
also applies to DNSSEC-generated queries.

Finally, some of the oldest and gnarliest code in dnsmasq has had
a significant clean-up. It's far from perfect, but it _is_ better.
This commit is contained in:
Simon Kelley
2021-06-08 22:10:55 +01:00
parent 50ccf9c585
commit 12a9aa7c62
12 changed files with 1691 additions and 1401 deletions
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2
Makefile
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@@ -82,7 +82,7 @@ objs = cache.o rfc1035.o util.o option.o forward.o network.o \
dhcp-common.o outpacket.o radv.o slaac.o auth.o ipset.o \
domain.o dnssec.o blockdata.o tables.o loop.o inotify.o \
poll.o rrfilter.o edns0.o arp.o crypto.o dump.o ubus.o \
metrics.o hash_questions.o
metrics.o hash_questions.o domain-match.o
hdrs = dnsmasq.h config.h dhcp-protocol.h dhcp6-protocol.h \
dns-protocol.h radv-protocol.h ip6addr.h metrics.h