Write-only option

[Jurij Smakov]

Hi!

I am doing backups from a number of machines to an rsync server. For some
time I was trying to come up with a solution, which would prevent users
from peeking at each other's files, which are backed up. Finally, I've
hacked rsync, introducing a new option "write only" for rsyncd.conf. When
set to true, this option forbids the transfers from server to the client,
thus solving my problems. Below is a patch against rsync-2.5.2 which
implements those changes. Hopefully, somebody else will find it useful. I
apologize, if that's the wrong list to post such stuff.

--Cut here----------------------------------------------------------------
diff -urN rsync-2.5.2.orig/loadparm.c rsync-2.5.2/loadparm.c
--- rsync-2.5.2.orig/loadparm.c	Sun Dec  2 09:16:15 2001
+++ rsync-2.5.2/loadparm.c	Sat Feb 23 13:48:12 2002
@@ -117,6 +117,7 @@
 	char *comment;
 	char *lock_file;
 	BOOL read_only;
+	BOOL write_only;
 	BOOL list;
 	BOOL use_chroot;
 	BOOL transfer_logging;
@@ -149,6 +150,7 @@
 	NULL,    /* comment */
 	DEFAULT_LOCK_FILE,    /* lock file */
 	True,    /* read only */
+	False,   /* write only */
 	True,    /* list */
 	True,    /* use chroot */
 	False,   /* transfer logging */
@@ -265,6 +267,7 @@
   {"lock file",        P_STRING,  P_LOCAL,  &sDefault.lock_file,   NULL,   0},
   {"path",             P_STRING,  P_LOCAL,  &sDefault.path,        NULL,   0},
   {"read only",        P_BOOL,    P_LOCAL,  &sDefault.read_only,   NULL,   0},
+  {"write only",       P_BOOL,    P_LOCAL,  &sDefault.write_only,  NULL,   0},
   {"list",             P_BOOL,    P_LOCAL,  &sDefault.list,        NULL,   0},
   {"use chroot",       P_BOOL,    P_LOCAL,  &sDefault.use_chroot,  NULL,   0},
   {"ignore nonreadable",P_BOOL,   P_LOCAL,  &sDefault.ignore_nonreadable,  NULL,   0},
@@ -342,6 +345,7 @@
 FN_LOCAL_STRING(lp_path, path)
 FN_LOCAL_STRING(lp_lock_file, lock_file)
 FN_LOCAL_BOOL(lp_read_only, read_only)
+FN_LOCAL_BOOL(lp_write_only, write_only)
 FN_LOCAL_BOOL(lp_list, list)
 FN_LOCAL_BOOL(lp_use_chroot, use_chroot)
 FN_LOCAL_BOOL(lp_transfer_logging, transfer_logging)
diff -urN rsync-2.5.2.orig/main.c rsync-2.5.2/main.c
--- rsync-2.5.2.orig/main.c	Fri Jan 25 11:07:41 2002
+++ rsync-2.5.2/main.c	Sat Feb 23 13:49:38 2002
@@ -306,10 +306,19 @@
 	extern int relative_paths;
 	extern int recurse;
 	extern int remote_version;
+	extern int am_daemon;
+	extern int module_id;
+	extern int am_sender;

 	if (verbose > 2)
 		rprintf(FINFO,"server_sender starting pid=%d\n",(int)getpid());

+	if (am_daemon && lp_write_only(module_id) && am_sender) {
+		rprintf(FERROR,"ERROR: module is write only\n");
+		exit_cleanup(RERR_SYNTAX);
+		return;
+	}
+
 	if (!relative_paths && !push_dir(dir, 0)) {
 		rprintf(FERROR,"push_dir %s: %s (3)\n",dir,strerror(errno));
 		exit_cleanup(RERR_FILESELECT);
diff -urN rsync-2.5.2.orig/proto.h rsync-2.5.2/proto.h
--- rsync-2.5.2.orig/proto.h	Sat Jan 26 00:07:33 2002
+++ rsync-2.5.2/proto.h	Sat Feb 23 13:48:12 2002
@@ -125,6 +125,7 @@
 char *lp_path(int );
 char *lp_lock_file(int );
 BOOL lp_read_only(int );
+BOOL lp_write_only(int );
 BOOL lp_list(int );
 BOOL lp_use_chroot(int );
 BOOL lp_transfer_logging(int );
--Cut here----------------------------------------------------------------

Best regards,

Jurij.