File openssh-7.6p1-IPv6_X_forwarding.patch of Package openssh.17031

# HG changeset patch
# Parent  f3dcdd10982b603041d4d78027c5996c1f328b46
Correctly parse DISPLAY variable for cases where it contains an IPv6 address
(which should - but not always is - in (square) brackets).

bnc#847710 - https://bugzilla.novell.com/show_bug.cgi?id=847710

Index: openssh-7.6p1/channels.c
===================================================================
--- openssh-7.6p1.orig/channels.c	2019-03-12 14:38:35.816933438 +0100
+++ openssh-7.6p1/channels.c	2019-03-12 14:38:36.592937803 +0100
@@ -4594,7 +4594,7 @@ x11_connect_display(struct ssh *ssh)
 	 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
 	 */
 	if (strncmp(display, "unix:", 5) == 0 ||
-	    display[0] == ':') {
+	    (display[0] == ':' && ((cp - display) < 2)) ) {
 		/* Connect to the unix domain socket. */
 		if (sscanf(strrchr(display, ':') + 1, "%u",
 		    &display_number) != 1) {
@@ -4613,9 +4613,10 @@ x11_connect_display(struct ssh *ssh)
 	/*
 	 * Connect to an inet socket.  The DISPLAY value is supposedly
 	 * hostname:d[.s], where hostname may also be numeric IP address.
+	 * Note that IPv6 numberic addresses contain colons (e.g. ::1:0)
 	 */
 	strlcpy(buf, display, sizeof(buf));
-	cp = strchr(buf, ':');
+	cp = strrchr(buf, ':');
 	if (!cp) {
 		error("Could not find ':' in DISPLAY: %.100s", display);
 		return -1;
@@ -4630,6 +4631,14 @@ x11_connect_display(struct ssh *ssh)
 		    display);
 		return -1;
 	}
+	
+	/* Remove brackets surrounding IPv6 addresses if there are any. */
+	if (buf[0] == '[' && (cp = strchr(buf, ']'))) {
+		*cp = 0;
+		cp = buf + 1;
+	} else {
+		cp = buf;
+	}
 
 	/* Look up the host address */
 	memset(&hints, 0, sizeof(hints));