[Bug 173] New: resolver does not return proper error codes

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=173

           Summary: resolver does not return proper error codes
           Product: uClibc
           Version: 0.9.30
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Networking
        AssignedTo: unassigned at uclibc.org
        ReportedBy: timo.teras at iki.fi
                CC: uclibc-cvs at uclibc.org
   Estimated Hours: 0.0


Created an attachment (id=129)
 --> (https://bugs.busybox.net/attachment.cgi?id=129)
Test-case

The res_query and other resolver functions do not parse the reply error codes
properly. h_errno mostly contains 2 (TRY_AGAIN) even though other error should
be there.

Attached is a test program that does T_TXT queries. On glibc and other system
reports (assuming av.com does not have TXT records in future):
av.com: -1, no_data (4)
non-existant-domain.info: -1, host_not_found (1)

While uclibc returns:
av.com: -1, try_again (2)
non-existant-domain.info: -1, try_again (2)

This is especially problematic for applications that depend on the NO_DATA
error. E.g. Overlapped ENUM lookups for NAPTR records.


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