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Fixed

LIN7-6505 : CLONE - wrl5 : netstat handle unresolvable IPv4 addresses better than for IPv6

Created: Jul 13, 2016    Updated: Sep 8, 2018
Resolved Date: Jul 13, 2016
Previous ID: LIN5-21737
Found In Version: 7.0.0.16
Fix Version: 7.0.0.18
Severity: Standard
Applicable for: Wind River Linux 7
Component/s: Networking

Description

Tested on RCPL35:
The 'netstat' utility throws "getnameinfo failed" (with 'UNKNOWN' address) when it can't resolve ipv6 address to name,
but in the same situation for ipv4 addresses it just prints values in the numeric format.
This issue with 'netstat' was fixed in the original 'net-tools'
30-sep-2013 https://github.com/ecki/net-tools/commit/a70c568b907d23ec2cf7defc81be50c351968f12
with a note:
--------------------
lib/inet6.c:INET6_rresolve() - various fixes
1) Fall-back to numeric address if getnameinfo fails.
Reverse lookup is not mandatory, therefore its fail
is not an error. Just return numeric address in that case.
This makes netstat/route show IPv6 address instead of
[UNKNOWN] in case of DNS problems.
--------------------


cat /etc/hosts
127.0.0.1 localhost
--------------------------------------------------------------------------------

When the ntp service is running bound to interfaces with ipv4 and ipv6 addresses:

=== root@eqm01s07p2 GPB ~ # netstat -na | grep -e 'failed' -e '123'
udp 0 0 127.0.0.254:123 0.0.0.0:*
udp 0 0 127.0.0.1:123 0.0.0.0:*
udp 0 0 0.0.0.0:123 0.0.0.0:*
udp6 0 0 ::1:123 :::*
udp6 0 0 :::123 :::*
--------------------------------------------------------------------------------

=== root@eqm01s07p2 GPB ~ # netstat -a | grep -e 'failed' -e 'ntp'
udp 0 0 127.0.0.254:ntp *:*
udp 0 0 127.0.0.254:ntp *:*
udp 0 0 localhost:ntp *:*
udp 0 0 *:ntp *:*
getnameinfo failed
udp6 0 0 [UNKNOWN]:ntp [::]:*
udp6 0 0 [::]:ntp [::]:*
--------------------------------------------------------------------------------

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