From 13c5fc0e1462307270145b8528e96a8cebfdcdc0 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Wed, 13 May 1998 08:58:07 +0000
Subject: [PATCH] save one round trip (version swapping) for daemon.

This is an imcompatible change in the socket protocol. You get "is
your shell clean" if using an older rsync client
---
 clientserver.c |  8 +++----
 compat.c       | 60 ++++++++++++++++++++++++++------------------------
 2 files changed, 35 insertions(+), 33 deletions(-)

diff --git a/clientserver.c b/clientserver.c
index 18d9494e..78e2104d 100644
--- a/clientserver.c
+++ b/clientserver.c
@@ -32,7 +32,7 @@ int start_socket_client(char *host, char *path, int argc, char *argv[])
 	int sargc=0;
 	char line[1024];
 	char *p;
-	int version;
+	extern int remote_version;
 
 	fd = open_socket_out(host, rsync_port);
 	if (fd == -1) {
@@ -52,7 +52,7 @@ int start_socket_client(char *host, char *path, int argc, char *argv[])
 		return -1;
 	}
 
-	if (sscanf(line,"@RSYNCD: %d", &version) != 1) {
+	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
 		return -1;
 	}
 
@@ -214,9 +214,9 @@ static int start_daemon(int fd)
 {
 	char line[200];
 	char *motd;
-	int version;
 	int i = -1;
 	extern char *config_file;
+	extern int remote_version;
 
 	if (!lp_load(config_file)) {
 		exit_cleanup(1);
@@ -230,7 +230,7 @@ static int start_daemon(int fd)
 		return -1;
 	}
 
-	if (sscanf(line,"@RSYNCD: %d", &version) != 1) {
+	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
 		return -1;
 	}	
 
diff --git a/compat.c b/compat.c
index 84010215..f53c433f 100644
--- a/compat.c
+++ b/compat.c
@@ -40,35 +40,37 @@ extern int verbose;
 
 void setup_protocol(int f_out,int f_in)
 {
-  if (am_server) {
-    remote_version = read_int(f_in);
-    write_int(f_out,PROTOCOL_VERSION);
-    write_flush(f_out);
-  } else {
-    write_int(f_out,PROTOCOL_VERSION);
-    write_flush(f_out);
-    remote_version = read_int(f_in);
-  }
+	if (remote_version == 0) {
+		if (am_server) {
+			remote_version = read_int(f_in);
+			write_int(f_out,PROTOCOL_VERSION);
+			write_flush(f_out);
+		} else {
+			write_int(f_out,PROTOCOL_VERSION);
+			write_flush(f_out);
+			remote_version = read_int(f_in);
+		}
+	}
 
-  if (remote_version < MIN_PROTOCOL_VERSION ||
-      remote_version > MAX_PROTOCOL_VERSION) {
-    rprintf(FERROR,"protocol version mismatch - is your shell clean?\n");
-    exit_cleanup(1);
-  }	
-
-  if (verbose > 2)
-	  rprintf(FINFO, "local_version=%d remote_version=%d\n",
-		  PROTOCOL_VERSION, remote_version);
-
-  if (remote_version >= 12) {
-    if (am_server) {
-      checksum_seed = time(NULL);
-      write_int(f_out,checksum_seed);
-    } else {
-      checksum_seed = read_int(f_in);
-    }
-  }
-
-  checksum_init();
+	if (remote_version < MIN_PROTOCOL_VERSION ||
+	    remote_version > MAX_PROTOCOL_VERSION) {
+		rprintf(FERROR,"protocol version mismatch - is your shell clean?\n");
+		exit_cleanup(1);
+	}	
+	
+	if (verbose > 2)
+		rprintf(FINFO, "local_version=%d remote_version=%d\n",
+			PROTOCOL_VERSION, remote_version);
+	
+	if (remote_version >= 12) {
+		if (am_server) {
+			checksum_seed = time(NULL);
+			write_int(f_out,checksum_seed);
+		} else {
+			checksum_seed = read_int(f_in);
+		}
+	}
+	
+	checksum_init();
 }
 
-- 
2.34.1