From 77154132236f5f4a1bfd8eaa12ed835fb0098e0f Mon Sep 17 00:00:00 2001
From: djm <djm@openbsd.org>
Date: Mon, 12 Jul 2010 22:41:13 +0000
Subject: [PATCH] expand %h to the hostname in ssh_config Hostname options.
 While this sounds useless, it is actually handy for working with unqualified
 hostnames:

Host *.*
	Hostname %h
Host *
	Hostname %h.example.org

"I like it" markus@
---
 usr.bin/ssh/ssh.c        | 15 ++++++++-------
 usr.bin/ssh/ssh_config.5 |  8 ++++++--
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/usr.bin/ssh/ssh.c b/usr.bin/ssh/ssh.c
index e87fb8a0478..2aab1048a31 100644
--- a/usr.bin/ssh/ssh.c
+++ b/usr.bin/ssh/ssh.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssh.c,v 1.342 2010/07/12 22:38:52 djm Exp $ */
+/* $OpenBSD: ssh.c,v 1.343 2010/07/12 22:41:13 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -664,6 +664,11 @@ main(int ac, char **av)
 		options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
 	}
 
+	if (options.hostname != NULL) {
+		host = percent_expand(options.hostname,
+		    "h", host, (char *)NULL);
+	}
+
 	if (options.local_command != NULL) {
 		char thishost[NI_MAXHOST];
 
@@ -673,16 +678,12 @@ main(int ac, char **av)
 		debug3("expanding LocalCommand: %s", options.local_command);
 		cp = options.local_command;
 		options.local_command = percent_expand(cp, "d", pw->pw_dir,
-		    "h", options.hostname? options.hostname : host,
-                    "l", thishost, "n", host, "r", options.user, "p", buf,
-                    "u", pw->pw_name, (char *)NULL);
+		    "h", host, "l", thishost, "n", host, "r", options.user,
+		    "p", buf, "u", pw->pw_name, (char *)NULL);
 		debug3("expanded LocalCommand: %s", options.local_command);
 		xfree(cp);
 	}
 
-	if (options.hostname != NULL)
-		host = options.hostname;
-
 	/* force lowercase for hostkey matching */
 	if (options.host_key_alias != NULL) {
 		for (p = options.host_key_alias; *p; p++)
diff --git a/usr.bin/ssh/ssh_config.5 b/usr.bin/ssh/ssh_config.5
index 531a60b5e32..e7bb21ebb43 100644
--- a/usr.bin/ssh/ssh_config.5
+++ b/usr.bin/ssh/ssh_config.5
@@ -34,8 +34,8 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $OpenBSD: ssh_config.5,v 1.135 2010/06/26 00:57:07 jmc Exp $
-.Dd $Mdocdate: June 26 2010 $
+.\" $OpenBSD: ssh_config.5,v 1.136 2010/07/12 22:41:13 djm Exp $
+.Dd $Mdocdate: July 12 2010 $
 .Dt SSH_CONFIG 5
 .Os
 .Sh NAME
@@ -537,6 +537,10 @@ or for multiple servers running on a single host.
 .It Cm HostName
 Specifies the real host name to log into.
 This can be used to specify nicknames or abbreviations for hosts.
+If the hostname contains the character sequence
+.Ql %h ,
+then this will be replaced with the host name specified on the commandline
+(this is useful for manipulating unqualified names).
 The default is the name given on the command line.
 Numeric IP addresses are also permitted (both on the command line and in
 .Cm HostName
-- 
2.20.1