[lwip-devel] [bug #46079] DNS didn't try the second dns server when the first one failed

[April M]

URL:
  <http://savannah.nongnu.org/bugs/?46079>

                 Summary: DNS didn't try the second dns server when the first
one failed
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: april_m
            Submitted on: Wed 30 Sep 2015 09:32:42 AM GMT
                Category: DNS
                Severity: 3 - Normal
              Item Group: Change Request
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: git head

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Details:

The logic in dns_check_entry() makes DNS only try one dns server.

It should be modified as below in "case DNS_STATE_ASKING" in line 1012 in
dns.c:
1. remove the first "break;" in line 1020, which is below "entry->retries =
0;"

2. use "else" to wrap "entry->tmr = entry->retries;" in line 1032,as bellow:
if (++entry->retries == DNS_MAX_RETRIES)
{
...
}
else
{
   /* wait longer for the next retry */
   entry->tmr = entry->retries;  
}




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