getifaddrs() issues on AIX

[miguel.sanders at arcelormittal.com]

Hi Samba team

I would like to report that the "interfaces / bind interfaces only" features of Samba do not function on AIX.
There are two problematic situations:
(1) Assume interfaces en1 and en2 have an IP address whereas en0 does not.
(Simplified) netstat output on AIX would show something like:
# netstat -in
Name  Mtu   Network     Address           
en1   9000  link#2      22.f1.30.0.10.6        
en1   9000  10.226.32   10.226.32.222          
en2   1500  link#3      22.f1.30.0.10.8        
en2   1500  10.226.33   10.226.33.222          
en0*  65390 link#4      22.f1.30.0.10.4        
lo0   16896 link#1                             
lo0   16896 127         127.0.0.1              
lo0   16896 ::1                                

If there is no interfaces entry in smb.conf (f.e. interfaces = en1 or interfaces = en2), smbd will simply not start.
The problem lies in the rep_getifaddrs function in lib/replace/getifaddrs.c
AIX, unlike Linux, also returns info on the layer 2 HW address of the adapter in the ifconf struct (as can be observed from the output above).
As a result, one should only call the SIOCGIFADDR ioctl if the sin_family is AF_INET. 

(2) Assume interface en2 has IP aliases.
(Simplified) netstat output on AIX would show something like:
# netstat -in
Name  Mtu   Network     Address           
en2   1500  link#3      22.f1.30.0.10.8        
en2   1500  10.226.33   10.226.33.222          
en2   1500  139.53.231  139.53.231.201         
en2   1500  139.53.231  139.53.231.107         
lo0   16896 link#1                             
lo0   16896 127         127.0.0.1              
lo0   16896 ::1                                

The IP aliases cannot be used in the interfaces entry in smb.conf.
The problem also lies in the rep_getifaddrs function in lib/replace/getifaddrs.c
AIX, unlike Linux, does not create a new interface for each IP alias.
As a result, the SIOCGIFADDR ioctl does not return any IP aliases of the network interface, only the base IP address.

Bugzilla # 6970 (+ patch) was created to address these issues.

Could you have a look at the patch?

Cheers!

Met vriendelijke groet
Best regards
Bien à vous

Miguel SANDERS
ArcelorMittal Gent

UNIX Systems & Storage
IT Supply Western Europe | John Kennedylaan 51
B-9042 Gent

T +32 9 347 3538 | F +32 9 347 4901 | M +32478 805 023
E miguel.sanders at arcelormittal.com
www.arcelormittal.com/gent


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