[FS#4181] dnsmasq-full issue with local name resolution

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - beko136 (beko136) 

Attached to Project - OpenWrt/LEDE Project
Summary - dnsmasq-full issue with local name resolution
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - * Device problem occurs on --> **WRT1900AC V1**
* Software versions of OpenWrt/LEDE release, packages, etc. --> **OpenWRT 21.02.1, package dnsmasq-full 2.85-8**
* Steps to reproduce
After installing OpenWRT 21.02.1 and replacing shipped dnsmasq package with dnsmasq-full, there is an issue, that local DNS doesn't work and no name resolution for LAN devices is possible. As a consequnce TLS encryption can't no longer be used correctly (without certificate warnings). I'm using static IP addresses and host names using Luci menu Network - Hostnames. All worked very well with many former OpenWRT versions until upgrading 21.02.1. I did several attempts and the problem is reproducable.

Message in syslog:
dnsmasq: daemon.err dnsmasq[6363]: failed to load names from /tmp/hosts/dhcp.cfg01411c: Permission denied

Workaround:
There is on old bug report for OpenWRT/LEDE 19.0.7 [https://bugs.openwrt.org/index.php?do=details&task_id=3090], where the same or at least a similar problem seems to be reported. The workaround described (adding chmod in /init.d/dnsmasq) solved this issue at my site.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4181

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