upstream: sftp: add missing lsetstat@openssh.com documentation

patch from Mike Frysinger

OpenBSD-Commit-ID: 9c114db88d505864075bfe7888b7c8745549715b

3 files changed, 39 insertions, 13 deletions

diff --git a/PROTOCOL b/PROTOCOL
index ecdacb9d..5c5e042e 100644
--- a/PROTOCOL
+++ b/PROTOCOL
@@ -465,6 +465,22 @@ respond with a SSH_FXP_STATUS message.
 This extension is advertised in the SSH_FXP_VERSION hello with version
 "1".
 
+3.7. sftp: Extension request "lsetstat@openssh.com"
+
+This request is like the "setstat" command, but sets file attributes on
+symlinks.  It is implemented as a SSH_FXP_EXTENDED request with the
+following format:
+
+	uint32		id
+	string		"lsetstat@openssh.com"
+	string		path
+	ATTRS		attrs
+
+See the "setstat" command for more details.
+
+This extension is advertised in the SSH_FXP_VERSION hello with version
+"1".
+
 4. Miscellaneous changes
 
 4.1 Public key format
@@ -496,4 +512,4 @@ OpenSSH's connection multiplexing uses messages as described in
 PROTOCOL.mux over a Unix domain socket for communications between a
 master instance and later clients.
 
-$OpenBSD: PROTOCOL,v 1.38 2020/07/05 23:59:45 djm Exp $
+$OpenBSD: PROTOCOL,v 1.39 2021/02/12 03:49:09 djm Exp $
diff --git a/sftp-server.c b/sftp-server.c
index f00f39e6..c80f0d3f 100644
--- a/sftp-server.c
+++ b/sftp-server.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sftp-server.c,v 1.120 2020/10/18 11:32:02 djm Exp $ */
+/* $OpenBSD: sftp-server.c,v 1.121 2021/02/12 03:49:09 djm Exp $ */
 /*
  * Copyright (c) 2000-2004 Markus Friedl.  All rights reserved.
  *
@@ -671,6 +671,7 @@ process_init(void)
 	    /* fsync extension */
 	    (r = sshbuf_put_cstring(msg, "fsync@openssh.com")) != 0 ||
 	    (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
+	    /* lsetstat extension */
 	    (r = sshbuf_put_cstring(msg, "lsetstat@openssh.com")) != 0 ||
 	    (r = sshbuf_put_cstring(msg, "1")) != 0) /* version */
 		fatal_fr(r, "compose");
diff --git a/sftp.1 b/sftp.1
index 052d4d8e..a1a63730 100644
--- a/sftp.1
+++ b/sftp.1
@@ -1,4 +1,4 @@
-.\" $OpenBSD: sftp.1,v 1.136 2021/01/26 15:40:17 naddy Exp $
+.\" $OpenBSD: sftp.1,v 1.137 2021/02/12 03:49:09 djm Exp $
 .\"
 .\" Copyright (c) 2001 Damien Miller.  All rights reserved.
 .\"
@@ -22,7 +22,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: January 26 2021 $
+.Dd $Mdocdate: February 12 2021 $
 .Dt SFTP 1
 .Os
 .Sh NAME
@@ -349,15 +349,18 @@ Change group of file
 .Ar path
 to
 .Ar grp .
-If the
-.Fl h
-flag is specified, then symlinks will not be followed.
 .Ar path
 may contain
 .Xr glob 7
 characters and may match multiple files.
 .Ar grp
 must be a numeric GID.
+.Pp
+If the
+.Fl h
+flag is specified, then symlinks will not be followed.
+Note that this is only supported by servers that implement
+the "lsetstat@openssh.com" extension.
 .It Xo Ic chmod
 .Op Fl h
 .Ar mode
@@ -367,13 +370,16 @@ Change permissions of file
 .Ar path
 to
 .Ar mode .
-If the
-.Fl h
-flag is specified, then symlinks will not be followed.
 .Ar path
 may contain
 .Xr glob 7
 characters and may match multiple files.
+.Pp
+If the
+.Fl h
+flag is specified, then symlinks will not be followed.
+Note that this is only supported by servers that implement
+the "lsetstat@openssh.com" extension.
 .It Xo Ic chown
 .Op Fl h
 .Ar own
@@ -383,15 +389,18 @@ Change owner of file
 .Ar path
 to
 .Ar own .
-If the
-.Fl h
-flag is specified, then symlinks will not be followed.
 .Ar path
 may contain
 .Xr glob 7
 characters and may match multiple files.
 .Ar own
 must be a numeric UID.
+.Pp
+If the
+.Fl h
+flag is specified, then symlinks will not be followed.
+Note that this is only supported by servers that implement
+the "lsetstat@openssh.com" extension.
 .It Xo Ic df
 .Op Fl hi
 .Op Ar path