Public bug reported:
Binary package hint: netatalk
Description: Ubuntu 9.10
Release: 9.10
ii netatalk
2.0.4~beta2-5ubuntu2 AppleTalk user
binaries
NetATalk fails to generate a unique server signature. Analysis of
client/server communication reveals that both NetATalk servers here
report the signature 01017F0001017F0001017F0001017F00 . This confuses
Mac clients, resulting in them apparently randomly directing AFP
requests to one server or the other. Users will connect to SERVER1 and
get a volume list from SERVER2 or vice versa.
The netatalk code for generating server signatures
(etc/afpd/status.c:191) uses the libc gethostid() call to obtain a
32-bit unique identifier for the host.
GNU Libc's man page for gethostid(3) notes that:
"In the glibc implementation, the hostid is stored in the file /etc/hostid.
(In glibc versions before 2.2, the file /var/adm/hostid was used.)
"In the glibc implementation, if gethostid() cannot open the file containing
the host ID, then it obtains the hostname using gethostname(2), passes that
hostname to gethostbyname_r(3) in order to obtain the host's IPv4
address, and returns a value obtained by bit-twiddling the IPv4 address.
(This value may not be unique.)"
Ubuntu systems do not have any /etc/hostid by default, so glibc falls
back on gethostbyname_r(3). However, Ubuntu systems' /etc/hosts files
map the hostname to 127.0.0.1:
127.0.0.1 localhost
127.0.1.1 HOSTNAME.localnet HOSTNAME
so gethostbyname_r for the hostname in /etc/hostname will always return
127.0.0.1 . gethostid(3) will therefore always return the same value,
and NetATalk's system id will always be the same on different Ubuntu
hosts.
** Affects: eglibc (Ubuntu)
Importance: Undecided
Status: New
** Affects: glibc (Ubuntu)
Importance: Undecided
Status: New
** Affects: netatalk (Ubuntu)
Importance: Undecided
Status: New
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netatalk fails to generate unique server signatures
https://bugs.launchpad.net/bugs/535517
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