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Change the default behaviour of talk(1) to use "localhost" as the

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"machine name" in ntalkd(8) request packets, when the destination
and source are local.

This should make talk(1) use much more pleasant for those security-
conscious individuals who have chosen to bind talkd to "localhost".

Previous to this change, talk(1) would require that the hostname of
the machine, as retrieved by gethostname(3), resolved to a valid and
reachable IPv4 address, using gethostbyname(3).

This makes talk(1) dependent on a valid host entry for "localhost"
in /etc/hosts (or the Domain Name System).

PR:		bin/23178
Submitted by:	angui.sh admin (with cleanups)
This commit is contained in:
Bruce M Simpson 2004-06-14 22:34:13 +00:00
parent 0abff1d4b6
commit 9d61853d9f
2 changed files with 18 additions and 1 deletions
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2
usr.bin/talk/get_names.c
View File

@ -90,7 +90,7 @@ get_names(argc, argv)
if (*cp == '\0') {
/* this is a local to local talk */
his_name = argv[1];
his_machine_name = my_machine_name;
my_machine_name = his_machine_name = "localhost";
} else {
if (*cp++ == '@') {
/* user@host */

17
usr.bin/talk/talk.1
View File

@ -142,3 +142,20 @@ The
.Nm
command appeared in
.Bx 4.2 .
.Pp
In
.Fx 5.2 ,
the default behaviour of
.Nm
was changed to treat local-to-local talk requests as originating
and terminating at
.Em localhost .
Before this change, it was required that the hostname (as per
.Xr gethostname 3 )
resolved to a valid IPv4 address (via
.Xr gethostbyname 3 ) ,
making
.Nm
unsuitable for use in configurations where
.Xr talkd 8
was bound to the loopback interface (normally for security reasons).