[FS#3221] ubox: validate.c: Link-Local IPv6 with interface ID not supported

[OpenWrt Bugs]

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

User who did this - Adrian Schmutzler (adrianschmutzler) 

Attached to Project - OpenWrt/LEDE Project
Summary - ubox: validate.c: Link-Local IPv6 with interface ID not supported
Task Type - Bug Report
Category - Packages
Status - New
Assigned To - 
Operating System - All
Severity - Low
Priority - Low
Reported Version - All
Due in Version - Undecided
Due Date - Undecided
Details - validate.c uses inet_pton for identifying IPv6 addresses [1], and this seems to not understand interface identifiers as used for Link-local IPv6 addresses.

Reproduce:


root at FFF-GW-Adrian:~# /sbin/validate_data host fdff::1
host - fdff::1 = true
root at FFF-GW-Adrian:~# /sbin/validate_data host fe80::1
host - fe80::1 = true
root at FFF-GW-Adrian:~# /sbin/validate_data host fe80::1%br-mesh
host - fe80::1%br-mesh = false


This is a problem practically whenever validata_data is used to check uci values.

For example, it is not possible to use a link-local address for specifying an NTP server:

https://github.com/openwrt/openwrt/blob/master/package/utils/busybox/files/sysntpd#L33

If 'server:list(host)' is changed to 'server:list(string)' there, it obviously works fine, as it's just the validation.

[1] https://git.openwrt.org/?p=project/ubox.git;a=blob;f=validate/validate.c;h=e72b8117ecd8b680778b0f5c7637ed6546a7736b;hb=HEAD#l402

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3221

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