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ip/tinc: accept udp connection from any udp source port

the remote host might be behind a NAT which translates the
source port, so if no host could be found, lookup the ip
address only.

--- a/sys/src/cmd/ip/tinc.c

+++ b/sys/src/cmd/ip/tinc.c

@@ -1440,12 +1440,16 @@

 {

 	uchar ip[IPaddrlen];

 	char dir[128];

+	int port;

 	Host *h;

-	h = findhost(ip, dir2ipport(fd2dir(fd, dir, sizeof(dir)), ip));

+	port = dir2ipport(fd2dir(fd, dir, sizeof(dir)), ip);

+	h = findhost(ip, port);

+	if(h == nil && incoming)

+		h = findhost(ip, -1);	/* might be behind NAT */

 	if(h != nil && h != myhost){

 		procsetname("udpclient %s %s %s %I!%d %s", myhost->name,

-			incoming ? "in": "out", dir, h->ip, h->port, h->name);

+			incoming ? "in": "out", dir, ip, port, h->name);

 		if(!incoming){

 			lock(h->cin);