- prevent rapid overlap in DHCP script updates
- check and allow localhost forwards with specific applications
- add option for rate limiting inbound queries
- change UCI list to table format with Unbound conf references

Signed-off-by: Eric Luehrsen <ericluehrsen@gmail.com>

Expressions '-o', '-a', and '\( \)' within test or '[ ]' are obsolete.
POSIX allows few arguments to test, so long expressions are not
portable. '[ p -a q ]' can be replaced with '[ p ] && [ q ]' instead.

Signed-off-by: Eric Luehrsen <ericluehrsen@gmail.com>

ssl_set1_host() is not available without openssl-1.1.0. Unbound can not do
host cert verification. DNS over TLS connects, but hosts are unverified. A
patch for log err is added with a noitce in README.md.
(see: https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=658)

Also, squash some minor robustness and TLS usability fixes.

Signed-off-by: Eric Luehrsen <ericluehrsen@gmail.com>

Unbound struggles with boot ifup, so procd triggers changed to push
outside of this noise. Unbound has run in /var/lib/unbound/, so chroot
(jail) protects /etc/, and it can save flash wear. Compiled defaults
reflect this now, so Unbound tools are easier run on the command line.

Signed-off-by: Eric Luehrsen <ericluehrsen@gmail.com>

With growing interest, DNS over TLS can be setup in Unbounds foward-zone:
clause. A broader UCI solution is added to support forward-, stub-, and
auth- zone clauses in a new 'zone' section. This implentation required
reworking scripts, because they did not scale. 'forward_domain' and
'prefetch_root' options are removed, and superceded by 'zone' section.

Signed-off-by: Eric Luehrsen <ericluehrsen@gmail.com>

With this patch the unbound init routines manage resolv.conf if and only if
when unbound will listen on 127.0.0.1#53 and dnsmasq is not.

Also logs some cases where config values are overriden with sane defaults.

Fixes (partially) LEDE FS#785
Fixes openwrt/packages#4487

Signed-off-by: Paul Oranje <por@xs4all.nl>

Unbound+DHCP (server of your choice) should be able to replicate
a lot of what dnsmasq provides. With this change set Unbound
still works with dnsmasq, but also it can work with a plain
DHCP server. Features have been added within the UCI itself
to act like dnsmasq.

- alone: name each interface relative to router hostname
- alone: prevent upstream leakage of your domain and '.local'
- dnsmasq: use dnsmasq UCI to configure forwarding clauses
- dhcp: work with odhcpd as example of companion DHCP-DNS
- dhcp: convert DHCPv4 leases into EUI64 SLAAC for DNS records
- all: enable encrypted remote unbound-control using splice conf
- all: allow user spliced conf-files for hybrid UCI and manual conf
-- 'unbound_srv.conf' will be spliced into the 'server:' clause
-- 'unbound_ext.conf' will add clauses to the end, example 'forward:'

README HOW TO for dnsmasq-in-serial, dnsmasq-in-parallel, and
unbound-with-odhcpd have better/added UCI starters. HOW TO for
including unbound_srv.conf and unbound_ext.conf are added.
Document new UCI: add_local_fqdn, add_wan_fqdn, dhcp4_slaac6,
dhcp_link, domain, and domain_type

Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>

This is bare minimum change in 'unbound.sh' and
'dnsmasq.sh' to migrate the UCI option set for
more flexibility. The boolean(s) to link to
dnsmasq are being changed to a state to include
odhcpd. It is executable but a small step for
clear change management.

Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>

-dnsmasq really provides nice local DHCP-DNS records
-Unbound host records would be clumsy to update
-Unbound can be configured to forward to dnsmasq
-iptools provided to facilitate PTR records
-flexible ipv6 colon notation is a bit complex

Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>