Re: Obtaining local host name
Re: Obtaining local host name
- Subject: Re: Obtaining local host name
- From: Marc Krochmal <email@hidden>
- Date: Sat, 24 May 2008 14:36:41 -0700
On May 24, 2008, at 1:57 PM, Ryan McGann wrote:
On May 24, 2008, at 12:05 PM, email@hidden
wrote:
gethostname isn't going to work. You're looking for
SCDynamicStoreCopyLocalHostName.
Mark,
I'm curious, why won't gethostname work? The hostname command seems
to return the correct string, and according to the sources, it
simply calls gethostname. What's different about the SytemConfig call?
Allan Nathanson has probably answered this a million times, but I
couldn't find it in the archives, so here goes. The original question
was, "is there a programmatic way (Objc method or C function call)
that will return the local host name string".
The way to get the "Local Hostname" from the Sharing pref pane is to
use SCDynamicStoreCopyLocalHostName. The way to get some seemingly
random "host name" is to use gethostname.
The following describes the algorithm used by configd's
IPMonitor.bundle to set the BSD hostname (the name returned by the
hostname(1) command).
• if available, use the name specified in the /etc/hostconfig file
(HOSTNAME=my-host-name)
• and this name need not have any association with a DNS name
• if available, use the name stored in the system/network preferences
file via the "scutil --set HostName my-host-name" command (introduced
w/10.4 for server systems).
• and this name need not have any association with a DNS name
• if available, use the name provided by the DHCP/BOOTP server for
the "primary" IP address
• and this name need not have any association with a DNS name
• if available, use the [first] name returned by a reverse DNS
(address-->name) query for the "primary" IP address
• and IP addresses on a private (behind a NAT) network generally
cannot be resolved
• if available, use the "Local Hostname" from the Sharing Pref Pane.
• use "localhost"
... and, NO, the BSD hostname need not have anything to do with the
DNS name (or names) associated with the system.
... and, NO, the BSD hostname has no relationship to the hosts
"Computer Name" which you would set in the Sharing Pref pane.
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