[DragonFlyBSD - Bug #2440] utmp/wtmp/lastlog host field too short

[Matthias Rampke via Redmine <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>]

Issue #2440 has been reported by Matthias Rampke.

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Bug #2440: utmp/wtmp/lastlog host field too short
http://bugs.dragonflybsd.org/issues/2440

Author: Matthias Rampke
Status: New
Priority: Low
Assignee: 
Category: 
Target version: 


In <include/utmp.h> the host field for utmp, wtmp and lastlog is set to 16 characters. This has the effect that both IPv6 addresses and the resolved hostnames sshd puts in lastlog are being truncated. It surfaces as truncated host names in the SSH "Last login: <time> from <host>" message on interactive logins.

IPv6 addresses are max. 39 characters long, 45 if you allow for IPv4 compatible notation: http://stackoverflow.com/questions/166132/maximum-length-of-the-textual-representation-of-an-ipv6-address but since there may be hostnames in there it should probably be MAXHOSTNAME (cf. <sys/param.h>).

Although changing the wtmp and lastlogin file format is probably not easy to achieve safely :(


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