- djm@cvs.openbsd.org 2010/12/04 00:18:01

     [sftp-server.c sftp.1 sftp-client.h sftp.c PROTOCOL sftp-client.c]
     add a protocol extension to support a hard link operation. It is
     available through the "ln" command in the client. The old "ln"
     behaviour of creating a symlink is available using its "-s" option
     or through the preexisting "symlink" command; based on a patch from
     miklos AT szeredi.hu in bz#1555; ok markus@

1 files changed, 27 insertions, 1 deletions

diff --git a/sftp-server.c b/sftp-server.c
index 47edcd0aa..b268d0883 100644
--- a/sftp-server.c
+++ b/sftp-server.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sftp-server.c,v 1.92 2010/11/04 02:45:34 djm Exp $ */
+/* $OpenBSD: sftp-server.c,v 1.93 2010/12/04 00:18:01 djm Exp $ */
 /*
  * Copyright (c) 2000-2004 Markus Friedl.  All rights reserved.
  *
@@ -535,6 +535,9 @@ process_init(void)
         /* fstatvfs extension */
         buffer_put_cstring(&msg, "fstatvfs@openssh.com");
         buffer_put_cstring(&msg, "2"); /* version */
+        /* hardlink extension */
+        buffer_put_cstring(&msg, "hardlink@openssh.com");
+        buffer_put_cstring(&msg, "1"); /* version */
         send_msg(&msg);
         buffer_free(&msg);
 }
@@ -1223,6 +1226,27 @@ process_extended_fstatvfs(u_int32_t id)
 }
 
 static void
+process_extended_hardlink(u_int32_t id)
+{
+        char *oldpath, *newpath;
+        int ret, status;
+
+        oldpath = get_string(NULL);
+        newpath = get_string(NULL);
+        debug3("request %u: hardlink", id);
+        logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
+        if (readonly)
+                status = SSH2_FX_PERMISSION_DENIED;
+        else {
+                ret = link(oldpath, newpath);
+                status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+        }
+        send_status(id, status);
+        xfree(oldpath);
+        xfree(newpath);
+}
+
+static void
 process_extended(void)
 {
         u_int32_t id;
@@ -1236,6 +1260,8 @@ process_extended(void)
                 process_extended_statvfs(id);
         else if (strcmp(request, "fstatvfs@openssh.com") == 0)
                 process_extended_fstatvfs(id);
+        else if (strcmp(request, "hardlink@openssh.com") == 0)
+                process_extended_hardlink(id);
         else
                 send_status(id, SSH2_FX_OP_UNSUPPORTED);        /* MUST */
         xfree(request);