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[lwip-devel] [bug #31701] Error return value from dns_gethostbyname() do

From: David Empson
Subject: [lwip-devel] [bug #31701] Error return value from dns_gethostbyname() doesn't match documentation
Date: Thu, 18 Nov 2010 21:58:05 +0000
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv: Gecko/20101026 Firefox/3.6.12


                 Summary: Error return value from dns_gethostbyname() doesn't
match documentation
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: dempson
            Submitted on: Fri Nov 19 10:58:04 2010
                Category: None
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: CVS Head



The comments for netconn_gethostbyname() indicate that a return value of
ERR_ARG is used for "dns client not initialized or invalid hostname".

The actual implementation in dns.c function dns_gethostbyname() is returning
ERR_VAL if dns_init() was not called, or either the hostname or IP address
pointer arguments are invalid.

I think dns_gethostbyname() should be corrected to return ERR_ARG instead of
ERR_VAL for these errors.

It may also be worth listing the ERR_ARG return value in the comment block
preceding dns_gethostbyname().

netconn_gethostbyname() can also return ERR_VAL for an timeout or other error
from the DNS server, so at present this return value is ambiguous.


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