0000473: DNS sluggish on queries of names ending with '.'

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Category

Severity

Reproducibility

Date Submitted

Last Update

0000473

[uClibc] Networking Support

major

always

10-05-05 15:38

06-03-08 12:05

Reporter

csapuntz

View Status

public

Assigned To

uClibc

Priority

normal

Resolution

fixed

Status

closed

Product Version

0.9.28

Summary

0000473: DNS sluggish on queries of names ending with '.'

Description

Great work on uClibc! Here's a small issue I ran into:

The DNS resolver generates invalid requests when lookups of names ending with
'.' are made and searchdomains are present.

What happens. Say we look up foo.com. and searchdomains is localdomain.

First the resolver tries:
foo.com. AAAA is looked up ---> no record found

Then it tries:
foo.com..localdomain AAAA --> notice the two dots

At this point an invalid packet is generated and BIND drops it and the resolver pauses waiting for a response.

There are two bugs here: appending a search path to a DNS name ending in '.' and trying to DNS encode a name with an empty component.

The patch attached fixes both bugs.

Additional Information

Attached Files

resolv.c.diff [^] (771 bytes) 10-05-05 15:38

Relationships

Notes
(0008094) vda 06-03-08 12:05	fixed in rev 22206. Thanks!

Issue History
Date Modified	Username	Field	Change
10-05-05 15:38	csapuntz	New Issue
10-05-05 15:38	csapuntz	Status	new => assigned
10-05-05 15:38	csapuntz	Assigned To	=> uClibc
10-05-05 15:38	csapuntz	File Added: resolv.c.diff
10-05-05 15:39	csapuntz	Issue Monitored: csapuntz
06-03-08 12:05	vda	Status	assigned => closed
06-03-08 12:05	vda	Note Added: 0008094
06-03-08 12:05	vda	Resolution	open => fixed