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T562: Config syntax for defining DNS forward authoritative zones
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- update copyright date
- validate incoming JSON data against a schema with voluptuous
- add usage help describing internal messages syntax at top of vyos-hostsd
- move socket and state file to directory /run/vyos-hostsd
- replace jinja2 rendering with vyos.template
- move all templates out of the executable into dedicated data/templates dirs
- move recursor.conf forward-zones-recurse to forward-zones-file
- generate lua-config-file for pdns-recursor with addNTA
- support adding custom forward zones for pdns-recursor with optional added NTA and/or recursion-desired
- move search_domains from set_host_name to separate add/delete/get commands
- unify functions to support abstracting them in the future
- track number of internal changes in "changes" variable saved in state file (informational in apply function)
- do not apply changes immediately, add apply function that applies all changes (to not reload pdns-recursor excessively for a large set of changes, users must call the apply function once at the end)
- add pdns_rec_control function that supports sending arbitrary commands to rec_control (fix pdns-recursor process name that caused the old function to think pdns-recursor was never running)
- create /run/powerdns if it doesn't exist (on boot vyos-hostsd starts before pdns-recursor but we need to put our generated conf files there)
- abstract specific command functions (add_*/del_*) into general functions to manipulate various types of data in the state variable
- add command types:
- forward_zones (generate custom forward zones for pdns-recursor)
- search_domains (move from set_host_name as dhcp client needs to change them too)
- name_server_tags_recursor (to set tags whose nameservers are added to pdns-recursor)
- name_server_tags_system (to set tags whose nameservers and search domains are added to /etc/resolv.conf)
- change hosts data format to make more sense (move tag from within each host dict to the key for a list of host dicts)
- do not remove state file when shut down cleanly, to not lose state when restarting vyos-hostsd service that's then impossible to restore without restarting the whole router - a reboot will remove the state file as it lives in a tmpfs (/run)
- remove too verbose info log on every received message
- set mode of socket to 770 to secure it against processes not in hostsd group
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The DHCP server is unable to apply entries to the hosts file because the permissions on the socket are getting created wrong.
```
$ ls -al /run/vyos-hostsd.sock
srwxrwxrwx 1 root vyattacfg 0 May 20 01:38 /run/vyos-hostsd.sock
```
This gives it the correct permissions so that the nobody/nobody user/group can change it.
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Please refer to https://phabricator.vyos.net/T2311
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In case if stdout PIPE were lost (for example, after systemd-journald restart), using print() will raise the exception.
This patch replaces print() to logging function, which is not sensitive to this problem. This makes vyos-hostd resistant to stdout disconnection, but of course, all logs after stdout disconnection will be lost.
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