[PATCH] When XDMCP -from is specified, only register the requested address

[Jon TURNEY]

When XDMCP -from is specified, only register the requested address,
rather than the requested address, and any others we have of different
address families to the requested address.

e.g. if we have 4 interfaces with both IPv4 and IPv6 addresses (which
are not IPv6 mapped IPV4 addresses), using -from with one of those IPv4
addresses currently means only that IPv4 address, and all IPv6 addresses
are used in the connection data in XDMCP REQUEST packet.

(See http://cygwin.com/ml/cygwin-xfree/2011-02/msg00000.html)

Signed-off-by: Jon TURNEY <jon.turney at dronecode.org.uk>
---
 os/xdmcp.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/os/xdmcp.c b/os/xdmcp.c
index 877b11c..f5331e1 100644
--- a/os/xdmcp.c
+++ b/os/xdmcp.c
@@ -486,7 +486,7 @@ XdmcpRegisterConnection (
 	    }
 	}
 #endif
-	if (fromAddr && memcmp(regAddr, fromAddr, regAddrlen) != 0) {
+	if (!fromAddr || memcmp(regAddr, fromAddr, regAddrlen) != 0) {
 	    return;
 	}
     }
-- 
1.7.4