Change the default behaviour of talk(1) to use "localhost" as the
"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)
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=130494
@ -90,7 +90,7 @@ get_names(argc, argv)
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if (*cp == '\0') {
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/* this is a local to local talk */
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his_name = argv[1];
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his_machine_name = my_machine_name;
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my_machine_name = his_machine_name = "localhost";
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} else {
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if (*cp++ == '@') {
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/* user@host */
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@ -142,3 +142,20 @@ The
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.Nm
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command appeared in
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.Bx 4.2 .
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.Pp
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In
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.Fx 5.2 ,
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the default behaviour of
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.Nm
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was changed to treat local-to-local talk requests as originating
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and terminating at
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.Em localhost .
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Before this change, it was required that the hostname (as per
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.Xr gethostname 3 )
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resolved to a valid IPv4 address (via
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.Xr gethostbyname 3 ) ,
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making
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.Nm
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unsuitable for use in configurations where
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.Xr talkd 8
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was bound to the loopback interface (normally for security reasons).
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