From 9708bbfa8e3094de8932a30b1d24c661558d8a03 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@tinc-vpn.org>
Date: Tue, 5 Jul 2011 21:19:48 +0200
Subject: [PATCH] Add a minor number to the protocol version.

---
 src/connection.h    |  3 ++-
 src/net_setup.c     |  3 ++-
 src/protocol.h      |  7 +++----
 src/protocol_auth.c | 12 ++++++------
 src/tincctl.c       |  4 ++--
 src/tincd.c         |  4 ++--
 6 files changed, 17 insertions(+), 16 deletions(-)

diff --git a/src/connection.h b/src/connection.h
index 75015ff..21edf11 100644
--- a/src/connection.h
+++ b/src/connection.h
@@ -56,7 +56,8 @@ typedef struct connection_t {
 
 	union sockaddr_t address;			/* his real (internet) ip */
 	char *hostname;				/* the hostname of its real ip */
-	int protocol_version;		/* used protocol */
+	int protocol_major;		/* used protocol */
+	int protocol_minor;		/* used protocol */
 
 	int socket;					/* socket used for this connection */
 	uint32_t options;			/* options for this connection */
diff --git a/src/net_setup.c b/src/net_setup.c
index f0e1cdf..7ceba36 100644
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -239,7 +239,8 @@ static bool setup_myself(void) {
 	myself->connection->hostname = xstrdup("MYSELF");
 
 	myself->connection->options = 0;
-	myself->connection->protocol_version = PROT_CURRENT;
+	myself->connection->protocol_major = PROT_MAJOR;
+	myself->connection->protocol_minor = PROT_MINOR;
 
 	if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {	/* Not acceptable */
 		logger(LOG_ERR, "Name for tinc daemon required!");
diff --git a/src/protocol.h b/src/protocol.h
index f1c2a20..7a7072e 100644
--- a/src/protocol.h
+++ b/src/protocol.h
@@ -21,11 +21,10 @@
 #ifndef __TINC_PROTOCOL_H__
 #define __TINC_PROTOCOL_H__
 
-/* Protocol version. Different versions are incompatible,
-   incompatible version have different protocols.
- */
+/* Protocol version. Different major versions are incompatible. */
 
-#define PROT_CURRENT 17
+#define PROT_MAJOR 17
+#define PROT_MINOR 0
 
 /* Silly Windows */
 
diff --git a/src/protocol_auth.c b/src/protocol_auth.c
index 6059096..7aaef17 100644
--- a/src/protocol_auth.c
+++ b/src/protocol_auth.c
@@ -40,14 +40,14 @@
 bool send_id(connection_t *c) {
 	gettimeofday(&c->start, NULL);
 
-	return send_request(c, "%d %s %d", ID, myself->connection->name,
-						myself->connection->protocol_version);
+	return send_request(c, "%d %s %d.%d", ID, myself->connection->name,
+						myself->connection->protocol_major, myself->connection->protocol_minor);
 }
 
 bool id_h(connection_t *c, char *request) {
 	char name[MAX_STRING_SIZE];
 
-	if(sscanf(request, "%*d " MAX_STRING " %d", name, &c->protocol_version) != 2) {
+	if(sscanf(request, "%*d " MAX_STRING " %d.%d", name, &c->protocol_major, &c->protocol_minor) < 2) {
 		logger(LOG_ERR, "Got bad %s from %s (%s)", "ID", c->name,
 			   c->hostname);
 		return false;
@@ -86,9 +86,9 @@ bool id_h(connection_t *c, char *request) {
 
 	/* Check if version matches */
 
-	if(c->protocol_version != myself->connection->protocol_version) {
-		logger(LOG_ERR, "Peer %s (%s) uses incompatible version %d",
-			   c->name, c->hostname, c->protocol_version);
+	if(c->protocol_major != myself->connection->protocol_major) {
+		logger(LOG_ERR, "Peer %s (%s) uses incompatible version %d.%d",
+			   c->name, c->hostname, c->protocol_major, c->protocol_minor);
 		return false;
 	}
 
diff --git a/src/tincctl.c b/src/tincctl.c
index 00a296d..7d27341 100644
--- a/src/tincctl.c
+++ b/src/tincctl.c
@@ -497,8 +497,8 @@ int main(int argc, char *argv[], char *envp[]) {
 	make_names();
 
 	if(show_version) {
-		printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
-			   VERSION, __DATE__, __TIME__, PROT_CURRENT);
+		printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
+			   VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
 		printf("Copyright (C) 1998-2009 Ivo Timmermans, Guus Sliepen and others.\n"
 				"See the AUTHORS file for a complete list.\n\n"
 				"tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
diff --git a/src/tincd.c b/src/tincd.c
index 45e29ab..8401b20 100644
--- a/src/tincd.c
+++ b/src/tincd.c
@@ -356,8 +356,8 @@ int main(int argc, char **argv) {
 	make_names();
 
 	if(show_version) {
-		printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
-			   VERSION, __DATE__, __TIME__, PROT_CURRENT);
+		printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
+			   VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
 		printf("Copyright (C) 1998-2011 Ivo Timmermans, Guus Sliepen and others.\n"
 				"See the AUTHORS file for a complete list.\n\n"
 				"tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
-- 
2.25.1