Been meaning to do this for years: introduce a configuration option

to manually tweak the host name and port number under which the SSH
host key is read and written.

I've put it in the cross-platform Connection panel. Partly under the
flimsy pretext that other backends _can_ use it if they so wish (and
in fact it overrides the host name for title-bar purposes in all
network backends, though it has no other effect in anything but
SSH); but mostly because the SSH panel was too full already :-)

[originally from svn r8033]

raw.c

@@ -139,6 +139,22 @@ static const char *raw_init(void *frontend_handle, void **backend_handle,
     if ((err = sk_socket_error(raw->s)) != NULL)
 	return err;
 
+    if (*cfg->loghost) {
+	char *colon;
+
+	sfree(*realhost);
+	*realhost = dupstr(cfg->loghost);
+	colon = strrchr(*realhost, ':');
+	if (colon) {
+	    /*
+	     * FIXME: if we ever update this aspect of ssh.c for
+	     * IPv6 literal management, this should change in line
+	     * with it.
+	     */
+	    *colon++ = '\0';
+	}
+    }
+
     return NULL;
 }