TWSD-115 [ANKK:HSOL-4015] / APV / WebAgent ttl value obtained from DNS server

Review Request #857 — Created May 9, 2025 and updated — Latest diff uploaded

Information
peteryeh
APV10
rel_apv_10_7_2
TWSD-115
Reviewers
jasonchang, kevin.poh, timsu, weikai 
This combines all webagent DNS commit (rev 38812, 38948, 39104) from rel_10_7 branch to rel_10_7_2.




Root cause: 

The libanl function getaddrinfo_a() doesnt' retrieve the complete TTL.  Currently, we uses the TTL value from user-configured page then enable some potentially packet handing issues.


Solution:

C-ares library (open source) has a function, ares_getaddrinfo() to obtain the TTL value.




Updates:

1.Move TTL assginment to the end of the operation.

2.Add Failover to c-ares for 2nd DNS server

3.Removed ares_queue_wait_empty(), replace it with while loop to wait for callbacks.
Webagent DNS WebUI / CLI show cmd
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