wm: dnsparser

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pkt: fix no packets being read (fragoffset seems to be 13bits

--- a/pkt.c

+++ b/pkt.c

@@ -39,9 +39,10 @@

 	pos += PKT_ID;

 	p->flags = pkt[pos];

-	pos += PKT_FLAGS;

+	/* flags are just 3 bits, smaller than a byte */

 	p->fragoffset = get2(pkt + pos);

+	p->fragoffset &= 0x1FFF;

 	pos += PKT_FRAGOFFSET;

 	p->ttl = pkt[pos];

@@ -69,7 +70,7 @@

 	"\tversion: 0x%x\theaderlen: 0x%x\tdsfield: %b\n",

 	p.version, p.headerlen, p.dsfield);

-	printf("\tlen: %d (%x)\tid: %x (%d)\n",

+	printf("\tlen: %d (%x)\tid: 0x%x (%d)\n",

 	p.len, p.len, p.id, p.id);

 	printf("\tttl: 0%x (%d)\tproto 0%x (%s)\tsum: 0x%x\n",

 	p.ttl, p.ttl, p.proto, pktTypeToStr(p.proto), p.sum);