X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/f855a7d01ab8401a307bb02cdcdee546df3e2423..a41a1e87182410ec6c2eeaddb0cd961ec554c404:/compat.c

diff --git a/compat.c b/compat.c
index ee9e0520..e90fa83a 100644
--- a/compat.c
+++ b/compat.c
@@ -17,57 +17,68 @@
    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"
 
-extern int am_server;
-
-extern int preserve_links;
-extern int preserve_perms;
-extern int preserve_devices;
-extern int preserve_uid;
-extern int preserve_gid;
-extern int preserve_times;
-extern int always_checksum;
-extern int checksum_seed;
+int remote_protocol = 0;
 
-
-extern int remote_version;
 extern int verbose;
+extern int am_server;
+extern int am_sender;
+extern int read_batch;
+extern int checksum_seed;
+extern int protocol_version;
 
 void setup_protocol(int f_out,int f_in)
 {
-	if (remote_version == 0) {
-		if (am_server) {
-			remote_version = read_int(f_in);
-			write_int(f_out,PROTOCOL_VERSION);
-		} else {
-			write_int(f_out,PROTOCOL_VERSION);
-			remote_version = read_int(f_in);
-		}
+	if (remote_protocol == 0) {
+		if (!read_batch)
+			write_int(f_out, protocol_version);
+		remote_protocol = read_int(f_in);
+		if (protocol_version > remote_protocol)
+			protocol_version = remote_protocol;
+	}
+	if (read_batch && remote_protocol > protocol_version) {
+	        rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
+			remote_protocol, protocol_version);
+		exit_cleanup(RERR_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 (verbose > 2)
-		rprintf(FINFO, "local_version=%d remote_version=%d\n",
-			PROTOCOL_VERSION, remote_version);
-	
-	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 (!checksum_seed)
 			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();
 }
-