i = EXTRACT_16BITS(cp);	cp += 2;	if (is_mdns)		class = (i & ~C_CACHE_FLUSH);	else		class = i;	if (class != C_IN && typ != T_OPT)		printf(" %s", tok2str(ns_class2str, "(Class %d)", class));	if (is_mdns) {		if (i & C_CACHE_FLUSH)			printf(" (Cache flush)");	}	if (typ == T_OPT) {		/* get opt flags */		cp += 2;		opt_flags = EXTRACT_16BITS(cp);		/* ignore rest of ttl field */		cp += 2;	} else if (vflag > 2) {		/* print ttl */		printf(" [");		relts_print(EXTRACT_32BITS(cp));		printf("]");		cp += 4;	} else {		/* ignore ttl */		cp += 4;	}	len = EXTRACT_16BITS(cp);	cp += 2;	rp = cp + len;	printf(" %s", tok2str(ns_type2str, "Type%d", typ));	if (rp > snapend)		return(NULL);	switch (typ) {	case T_A:		if (!TTEST2(*cp, sizeof(struct in_addr)))			return(NULL);		printf(" %s", intoa(htonl(EXTRACT_32BITS(cp))));		break;	case T_NS:	case T_CNAME:	case T_PTR:#ifdef T_DNAME	case T_DNAME:#endif		putchar(' ');		if (ns_nprint(cp, bp) == NULL)			return(NULL);		break;	case T_SOA:		if (!vflag)			break;		putchar(' ');		if ((cp = ns_nprint(cp, bp)) == NULL)			return(NULL);		putchar(' ');		if ((cp = ns_nprint(cp, bp)) == NULL)			return(NULL);		if (!TTEST2(*cp, 5 * 4))			return(NULL);		printf(" %u", EXTRACT_32BITS(cp));		cp += 4;		printf(" %u", EXTRACT_32BITS(cp));		cp += 4;		printf(" %u", EXTRACT_32BITS(cp));		cp += 4;		printf(" %u", EXTRACT_32BITS(cp));		cp += 4;		printf(" %u", EXTRACT_32BITS(cp));		cp += 4;		break;	case T_MX:		putchar(' ');		if (!TTEST2(*cp, 2))			return(NULL);		if (ns_nprint(cp + 2, bp) == NULL)			return(NULL);		printf(" %d", EXTRACT_16BITS(cp));		break;	case T_TXT:		while (cp < rp) {			printf(" \"");			cp = ns_cprint(cp);			if (cp == NULL)				return(NULL);			putchar('"');		}		break;	case T_SRV:		putchar(' ');		if (!TTEST2(*cp, 6))			return(NULL);		if (ns_nprint(cp + 6, bp) == NULL)			return(NULL);		printf(":%d %d %d", EXTRACT_16BITS(cp + 4),			EXTRACT_16BITS(cp), EXTRACT_16BITS(cp + 2));		break;#ifdef INET6	case T_AAAA:	    {		struct in6_addr addr;		char ntop_buf[INET6_ADDRSTRLEN];		if (!TTEST2(*cp, sizeof(struct in6_addr)))			return(NULL);		memcpy(&addr, cp, sizeof(struct in6_addr));		printf(" %s",		    inet_ntop(AF_INET6, &addr, ntop_buf, sizeof(ntop_buf)));		break;	    }	case T_A6:	    {		struct in6_addr a;		int pbit, pbyte;		char ntop_buf[INET6_ADDRSTRLEN];		if (!TTEST2(*cp, 1))			return(NULL);		pbit = *cp;		pbyte = (pbit & ~7) / 8;		if (pbit > 128) {			printf(" %u(bad plen)", pbit);			break;		} else if (pbit < 128) {			if (!TTEST2(*(cp + 1), sizeof(a) - pbyte))				return(NULL);			memset(&a, 0, sizeof(a));			memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte);			printf(" %u %s", pbit,			    inet_ntop(AF_INET6, &a, ntop_buf, sizeof(ntop_buf)));		}		if (pbit > 0) {			putchar(' ');			if (ns_nprint(cp + 1 + sizeof(a) - pbyte, bp) == NULL)				return(NULL);		}		break;	    }#endif /*INET6*/	case T_OPT:		printf(" UDPsize=%u", class);		if (opt_flags & 0x8000)			printf(" OK");		break;	case T_UNSPECA:		/* One long string */		if (!TTEST2(*cp, len))			return(NULL);		if (fn_printn(cp, len, snapend))			return(NULL);		break;	case T_TSIG:	    {		if (cp + len > snapend)			return(NULL);		if (!vflag)			break;		putchar(' ');		if ((cp = ns_nprint(cp, bp)) == NULL)			return(NULL);		cp += 6;		if (!TTEST2(*cp, 2))			return(NULL);		printf(" fudge=%u", EXTRACT_16BITS(cp));		cp += 2;		if (!TTEST2(*cp, 2))			return(NULL);		printf(" maclen=%u", EXTRACT_16BITS(cp));		cp += 2 + EXTRACT_16BITS(cp);		if (!TTEST2(*cp, 2))			return(NULL);		printf(" origid=%u", EXTRACT_16BITS(cp));		cp += 2;		if (!TTEST2(*cp, 2))			return(NULL);		printf(" error=%u", EXTRACT_16BITS(cp));		cp += 2;		if (!TTEST2(*cp, 2))			return(NULL);		printf(" otherlen=%u", EXTRACT_16BITS(cp));		cp += 2;	    }	}	return (rp);		/* XXX This isn't always right */}voidns_print(register const u_char *bp, u_int length, int is_mdns){	register const HEADER *np;	register int qdcount, ancount, nscount, arcount;	register const u_char *cp;	u_int16_t b2;	np = (const HEADER *)bp;	TCHECK(*np);	/* get the byte-order right */	qdcount = EXTRACT_16BITS(&np->qdcount);	ancount = EXTRACT_16BITS(&np->ancount);	nscount = EXTRACT_16BITS(&np->nscount);	arcount = EXTRACT_16BITS(&np->arcount);	if (DNS_QR(np)) {		/* this is a response */		printf("%d%s%s%s%s%s%s",			EXTRACT_16BITS(&np->id),			ns_ops[DNS_OPCODE(np)],			ns_resp[DNS_RCODE(np)],			DNS_AA(np)? "*" : "",			DNS_RA(np)? "" : "-",			DNS_TC(np)? "|" : "",			DNS_AD(np)? "$" : "");		if (qdcount != 1)			printf(" [%dq]", qdcount);		/* Print QUESTION section on -vv */		cp = (const u_char *)(np + 1);		while (qdcount--) {			if (qdcount < EXTRACT_16BITS(&np->qdcount) - 1)				putchar(',');			if (vflag > 1) {				fputs(" q:", stdout);				if ((cp = ns_qprint(cp, bp, is_mdns)) == NULL)					goto trunc;			} else {				if ((cp = ns_nskip(cp)) == NULL)					goto trunc;				cp += 4;	/* skip QTYPE and QCLASS */			}		}		printf(" %d/%d/%d", ancount, nscount, arcount);		if (ancount--) {			if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)				goto trunc;			while (cp < snapend && ancount--) {				putchar(',');				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)					goto trunc;			}		}		if (ancount > 0)			goto trunc;		/* Print NS and AR sections on -vv */		if (vflag > 1) {			if (cp < snapend && nscount--) {				fputs(" ns:", stdout);				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)					goto trunc;				while (cp < snapend && nscount--) {					putchar(',');					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)						goto trunc;				}			}			if (nscount > 0)				goto trunc;			if (cp < snapend && arcount--) {				fputs(" ar:", stdout);				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)					goto trunc;				while (cp < snapend && arcount--) {					putchar(',');					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)						goto trunc;				}			}			if (arcount > 0)				goto trunc;		}	}	else {		/* this is a request */		printf("%d%s%s%s", EXTRACT_16BITS(&np->id), ns_ops[DNS_OPCODE(np)],		    DNS_RD(np) ? "+" : "",		    DNS_CD(np) ? "%" : "");		/* any weirdness? */		b2 = EXTRACT_16BITS(((u_short *)np)+1);		if (b2 & 0x6cf)			printf(" [b2&3=0x%x]", b2);		if (DNS_OPCODE(np) == IQUERY) {			if (qdcount)				printf(" [%dq]", qdcount);			if (ancount != 1)				printf(" [%da]", ancount);		}		else {			if (ancount)				printf(" [%da]", ancount);			if (qdcount != 1)				printf(" [%dq]", qdcount);		}		if (nscount)			printf(" [%dn]", nscount);		if (arcount)			printf(" [%dau]", arcount);		cp = (const u_char *)(np + 1);		if (qdcount--) {			cp = ns_qprint(cp, (const u_char *)np, is_mdns);			if (!cp)				goto trunc;			while (cp < snapend && qdcount--) {				cp = ns_qprint((const u_char *)cp,					       (const u_char *)np,					       is_mdns);				if (!cp)					goto trunc;			}		}		if (qdcount > 0)			goto trunc;		/* Print remaining sections on -vv */		if (vflag > 1) {			if (ancount--) {				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)					goto trunc;				while (cp < snapend && ancount--) {					putchar(',');					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)						goto trunc;				}			}			if (ancount > 0)				goto trunc;			if (cp < snapend && nscount--) {				fputs(" ns:", stdout);				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)					goto trunc;				while (nscount-- && cp < snapend) {					putchar(',');					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)						goto trunc;				}			}			if (nscount > 0)				goto trunc;			if (cp < snapend && arcount--) {				fputs(" ar:", stdout);				if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)					goto trunc;				while (cp < snapend && arcount--) {					putchar(',');					if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)						goto trunc;				}			}			if (arcount > 0)				goto trunc;		}	}	printf(" (%d)", length);	return;  trunc:	printf("[|domain]");	return;}