X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/ff81e809f46293171a332a2faa320aca57277b4b..37c817eb8159366539d4a9c69bd78e74d4941c06:/compat.c

diff --git a/compat.c b/compat.c
index 305c827d..c2a11038 100644
--- a/compat.c
+++ b/compat.c
@@ -17,10 +17,16 @@
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
-/* compatability routines for older rsync protocol versions */
+/**
+ * @file compat.c
+ *
+ * Compatibility routines for older rsync protocol versions.
+ **/
 
 #include "rsync.h"
 
+int remote_protocol = 0;
+
 extern int am_server;
 
 extern int preserve_links;
@@ -33,37 +39,58 @@ extern int always_checksum;
 extern int checksum_seed;
 
 
-extern int remote_version;
+extern int protocol_version;
 extern int verbose;
 
+extern int read_batch;
+extern int write_batch;
+
 void setup_protocol(int f_out,int f_in)
 {
-	if (remote_version == 0) {
+	if (remote_protocol == 0) {
 		if (am_server) {
-			remote_version = read_int(f_in);
-			write_int(f_out,PROTOCOL_VERSION);
+			remote_protocol = read_int(f_in);
+			write_int(f_out, protocol_version);
 		} else {
-			write_int(f_out,PROTOCOL_VERSION);
-			remote_version = read_int(f_in);
+			write_int(f_out, protocol_version);
+			remote_protocol = read_int(f_in);
 		}
+		if (protocol_version > remote_protocol)
+			protocol_version = remote_protocol;
 	}
 
-	if (remote_version < MIN_PROTOCOL_VERSION ||
-	    remote_version > MAX_PROTOCOL_VERSION) {
+	if (verbose > 3) {
+		rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
+			am_server? "Server" : "Client", remote_protocol, protocol_version);
+	}
+	if (remote_protocol < MIN_PROTOCOL_VERSION
+	 || remote_protocol > MAX_PROTOCOL_VERSION) {
 		rprintf(FERROR,"protocol version mismatch - is your shell clean?\n");
 		rprintf(FERROR,"(see the rsync man page for an explanation)\n");
 		exit_cleanup(RERR_PROTOCOL);
-	}	
-	
-	if (remote_version >= 12) {
-		if (am_server) {
+	}
+	if (remote_protocol < OLD_PROTOCOL_VERSION) {
+		rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
+			am_server? "Client" : "Server");
+	}
+	if (protocol_version < MIN_PROTOCOL_VERSION) {
+		rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
+			MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
+		exit_cleanup(RERR_PROTOCOL);
+	}
+	if (protocol_version > PROTOCOL_VERSION) {
+		rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
+			PROTOCOL_VERSION, am_server? "Server" : "Client");
+		exit_cleanup(RERR_PROTOCOL);
+	}
+
+	if (am_server) {
+		if (read_batch || write_batch)
+			checksum_seed = 32761;
+		else
 			checksum_seed = time(NULL);
-			write_int(f_out,checksum_seed);
-		} else {
-			checksum_seed = read_int(f_in);
-		}
+		write_int(f_out,checksum_seed);
+	} else {
+		checksum_seed = read_int(f_in);
 	}
-	
-	checksum_init();
 }
-