From eb391c52eed46f3f03b404553df417851fc0cb90 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@tinc-vpn.org>
Date: Tue, 8 Aug 2006 13:21:08 +0000
Subject: [PATCH] Do not break strict aliasing of status_t structs.

---
 src/connection.c |  2 +-
 src/connection.h | 27 +++++++++++++++------------
 src/net.c        |  2 +-
 src/node.h       | 19 +++++++++++--------
 4 files changed, 28 insertions(+), 22 deletions(-)

diff --git a/src/connection.c b/src/connection.c
index c1a1b69f..c4c9fd48 100644
--- a/src/connection.c
+++ b/src/connection.c
@@ -122,7 +122,7 @@ void dump_connections(void)
 	for(node = connection_tree->head; node; node = node->next) {
 		c = node->data;
 		logger(LOG_DEBUG, _(" %s at %s options %lx socket %d status %04x outbuf %d/%d/%d"),
-			   c->name, c->hostname, c->options, c->socket, *(uint32_t *)&c->status,
+			   c->name, c->hostname, c->options, c->socket, c->status.value,
 			   c->outbufsize, c->outbufstart, c->outbuflen);
 	}
 
diff --git a/src/connection.h b/src/connection.h
index 87988db4..087d8f00 100644
--- a/src/connection.h
+++ b/src/connection.h
@@ -32,17 +32,20 @@
 #define OPTION_TCPONLY		0x0002
 #define OPTION_PMTU_DISCOVERY	0x0004
 
-typedef struct connection_status_t {
-	int pinged:1;				/* sent ping */
-	int active:1;				/* 1 if active.. */
-	int connecting:1;			/* 1 if we are waiting for a non-blocking connect() to finish */
-	int termreq:1;				/* the termination of this connection was requested */
-	int remove:1;				/* Set to 1 if you want this connection removed */
-	int timeout:1;				/* 1 if gotten timeout */
-	int encryptout:1;			/* 1 if we can encrypt outgoing traffic */
-	int decryptin:1;			/* 1 if we have to decrypt incoming traffic */
-	int mst:1;				/* 1 if this connection is part of a minimum spanning tree */
-	int unused:23;
+typedef union connection_status_t {
+	struct {
+		int pinged:1;				/* sent ping */
+		int active:1;				/* 1 if active.. */
+		int connecting:1;			/* 1 if we are waiting for a non-blocking connect() to finish */
+		int termreq:1;				/* the termination of this connection was requested */
+		int remove:1;				/* Set to 1 if you want this connection removed */
+		int timeout:1;				/* 1 if gotten timeout */
+		int encryptout:1;			/* 1 if we can encrypt outgoing traffic */
+		int decryptin:1;			/* 1 if we have to decrypt incoming traffic */
+		int mst:1;				/* 1 if this connection is part of a minimum spanning tree */
+		int unused:23;
+	};
+	uint32_t value;
 } connection_status_t;
 
 #include "edge.h"
@@ -59,7 +62,7 @@ typedef struct connection_t {
 
 	int socket;					/* socket used for this connection */
 	long int options;			/* options for this connection */
-	struct connection_status_t status;	/* status info */
+	connection_status_t status;	/* status info */
 	int estimated_weight;		/* estimation for the weight of the edge for this connection */
 	struct timeval start;		/* time this connection was started, used for above estimation */
 	struct outgoing_t *outgoing;	/* used to keep track of outgoing connections */
diff --git a/src/net.c b/src/net.c
index e40caefd..144655fb 100644
--- a/src/net.c
+++ b/src/net.c
@@ -251,7 +251,7 @@ static void check_dead_connections(void)
 			} else {
 				if(c->status.remove) {
 					logger(LOG_WARNING, _("Old connection_t for %s (%s) status %04x still lingering, deleting..."),
-						   c->name, c->hostname, *(uint32_t *)&c->status);
+						   c->name, c->hostname, c->status.value);
 					connection_del(c);
 					continue;
 				}
diff --git a/src/node.h b/src/node.h
index 9c49a799..2ea96922 100644
--- a/src/node.h
+++ b/src/node.h
@@ -29,14 +29,17 @@
 #include "list.h"
 #include "subnet.h"
 
-typedef struct node_status_t {
-	int active:1;				/* 1 if active.. */
-	int validkey:1;				/* 1 if we currently have a valid key for him */
-	int waitingforkey:1;			/* 1 if we already sent out a request */
-	int visited:1;				/* 1 if this node has been visited by one of the graph algorithms */
-	int reachable:1;			/* 1 if this node is reachable in the graph */
-	int indirect:1;				/* 1 if this node is not directly reachable by us */
-	int unused:26;
+typedef union node_status_t {
+	struct {
+		int active:1;				/* 1 if active.. */
+		int validkey:1;				/* 1 if we currently have a valid key for him */
+		int waitingforkey:1;			/* 1 if we already sent out a request */
+		int visited:1;				/* 1 if this node has been visited by one of the graph algorithms */
+		int reachable:1;			/* 1 if this node is reachable in the graph */
+		int indirect:1;				/* 1 if this node is not directly reachable by us */
+		int unused:26;
+	};
+	uint32_t value;
 } node_status_t;
 
 typedef struct node_t {
-- 
2.20.1