[Bug libc/5507] New: gai() sorting is broken

[Bug libc/5507] New: gai() sorting is broken

[madcoder at debian dot org]

$ getent ahosts ftp.fi.debian.org.
130.230.54.99   DGRAM  ftp.fi.debian.org
130.230.54.99   RAW    
2001:708:310:54::99 STREAM 
2001:708:310:54::99 DGRAM  
2001:708:310:54::99 RAW    
130.230.54.99   STREAM 

The 3 INET6 addresses should come first, followed by the INET ones.

This worked with a 2.6.1 libc.

-- 
           Summary: gai() sorting is broken
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: madcoder at debian dot org
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=5507

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[Bug libc/5507] gai() sorting is broken

[madcoder at debian dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |debian-glibc at lists dot
                   |                            |debian dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=5507

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[Bug libc/5507] gai() sorting is broken

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2007-12-18 15:12 -------
I cannot reproduce this.  Work fine for me:


$ getent ahosts ftp.fi.debian.org
2001:708:310:54::99 STREAM ftp.fi.debian.org
2001:708:310:54::99 DGRAM  
2001:708:310:54::99 RAW    
130.230.54.99   STREAM 
130.230.54.99   DGRAM  
130.230.54.99   RAW    


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WORKSFORME


http://sourceware.org/bugzilla/show_bug.cgi?id=5507

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[Bug libc/5507] gai() sorting is broken

[madcoder at debian dot org]

------- Additional Comments From madcoder at debian dot org  2007-12-18 16:35 -------
Well, I'd be glad if you tried to interact with people before closing bugs.

$ host olympe.madism.org; host pan.madism.org
olympe.madism.org has address 82.243.245.108
pan.madism.org has address 88.191.52.104
pan.madism.org has IPv6 address 2002:58bf:3468::1

olympe also has ipv6 address 2a01:5d8:52f3:f56c:20f:eaff:fe66:7aad

on olympe I can see:

$ getent ahosts ftp.fi.debian.org.
2001:708:310:54::99 STREAM ftp.fi.debian.org
2001:708:310:54::99 DGRAM  
2001:708:310:54::99 RAW    
130.230.54.99   DGRAM  
130.230.54.99   RAW    
130.230.54.99   STREAM 
$ getent ahosts liszt.debian.org.
2001:41b8:0:1003:213:21ff:fe20:1426 STREAM liszt.debian.org
2001:41b8:0:1003:213:21ff:fe20:1426 DGRAM  
2001:41b8:0:1003:213:21ff:fe20:1426 RAW    
82.195.75.100   DGRAM  
82.195.75.100   RAW    
82.195.75.100   STREAM 
$ getent ahosts pan.madism.org.
88.191.52.104   DGRAM  pan.madism.org
88.191.52.104   RAW    
2002:58bf:3468::1 STREAM 
2002:58bf:3468::1 DGRAM  
2002:58bf:3468::1 RAW    
88.191.52.104   STREAM 
$ getent ahosts www.corsac.net
81.57.48.219    RAW    www.corsac.net
81.57.48.219    DGRAM  
2002:5139:30db::2 STREAM 
2002:5139:30db::2 DGRAM  
2002:5139:30db::2 RAW    
81.57.48.219    STREAM 

I don't know what makes the last ones special, /etc/hosts has no information 
about pan.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|WORKSFORME                  |


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[Bug libc/5507] gai() sorting is broken

[aurelien at aurel32 dot net]

------- Additional Comments From aurelien at aurel32 dot net  2007-12-18 17:05 -------
Additional information:

# getent ahosts ftp.fi.debian.org
130.230.54.99   STREAM ftp.fi.debian.org
130.230.54.99   DGRAM
130.230.54.99   RAW
2001:708:310:54::99 STREAM
2001:708:310:54::99 DGRAM
2001:708:310:54::99 RAW
# ip addr add 2001:708:310:54::1/64 dev eth0
# getent ahosts ftp.fi.debian.org
2001:708:310:54::99 STREAM ftp.fi.debian.org
2001:708:310:54::99 DGRAM
2001:708:310:54::99 RAW
130.230.54.99   STREAM
130.230.54.99   DGRAM
130.230.54.99   RAW

So the IPv6 vs IPv4 order actually depends on the local address. This is with 
an unmodified gai.conf.

-- 


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[Bug libc/5507] gai() sorting is broken

[ismail at pardus dot org dot tr]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ismail at pardus dot org dot
                   |                            |tr


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[Bug libc/5507] gai() sorting is broken

[aurelien at aurel32 dot net]

------- Additional Comments From aurelien at aurel32 dot net  2007-12-18 18:02 -------
The problem is that the labels are not sorted by value in 
sysdeps/posix/getaddrinfo.c. The code assumes that they are, so the table is 
not sorted if no label is present in /etc/gai.conf.

-- 


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[Bug libc/5507] gai() sorting is broken

[aurelien at aurel32 dot net]

------- Additional Comments From aurelien at aurel32 dot net  2007-12-18 18:03 -------
Created an attachment (id=2150)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2150&action=view)
Patch to fix the bug


-- 


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[Bug libc/5507] gai() sorting is broken

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2008-01-11 00:17 -------
(In reply to comment #5)
> Patch to fix the bug

Nonsense.  This patch is completely, utterly broken and shows you don't
understand a bit of the code.  You move the catch-all entry to the front.

And of course will the order depend on the addresses of the local machine. 
That's the whole point of the sorting.

I see nothing wrong.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |WORKSFORME


http://sourceware.org/bugzilla/show_bug.cgi?id=5507

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[Bug libc/5507] gai() sorting is broken

[aurelien at aurel32 dot net]

------- Additional Comments From aurelien at aurel32 dot net  2008-01-13 12:48 -------
(In reply to comment #6)
> (In reply to comment #5)
> > Patch to fix the bug
> 
> Nonsense.  This patch is completely, utterly broken and shows you don't
> understand a bit of the code.  You move the catch-all entry to the front.
> 
> And of course will the order depend on the addresses of the local machine. 
> That's the whole point of the sorting.
> 
> I see nothing wrong.
> 

It works for you because you are using a native IPv6 address and not a 6to4 
address which has its own label in /etc/gai.conf.

130.230.54.99   DGRAM  ftp.fi.debian.org
130.230.54.99   RAW    
2001:708:310:54::99 STREAM 
2001:708:310:54::99 DGRAM  
2001:708:310:54::99 RAW    
130.230.54.99   STREAM 

I don't really understand why the IPv4/IPv6 order is different for UDP and TCP. 
It should be all IPv4 first or all IPv6 first, but not mixed. That is a bug.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|WORKSFORME                  |


http://sourceware.org/bugzilla/show_bug.cgi?id=5507

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[Bug libc/5507] gai() sorting is broken

[aurelien at aurel32 dot net]

------- Additional Comments From aurelien at aurel32 dot net  2008-02-13 00:49 -------
This bug is actually fixed in CVS.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |FIXED


http://sourceware.org/bugzilla/show_bug.cgi?id=5507

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