print-domain.c

Windump3.6.2源代码

	{ T_NSAP_PTR,	"NSAP_PTR" },
	{ T_SIG,	"SIG" },
	{ T_KEY,	"KEY" },
	{ T_PX,		"PX" },
	{ T_GPOS,	"GPOS" },
	{ T_AAAA,	"AAAA" },
	{ T_LOC,	"LOC " },
	{ T_NXT,	"NXT " },
	{ T_EID,	"EID " },
	{ T_NIMLOC,	"NIMLOC " },
	{ T_SRV,	"SRV " },
	{ T_ATMA,	"ATMA " },
	{ T_NAPTR,	"NAPTR " },
	{ T_A6,		"A6 " },
	{ T_DNAME,	"DNAME " },
	{ T_OPT,	"OPT " },
	{ T_UINFO,	"UINFO" },
	{ T_UID,	"UID" },
	{ T_GID,	"GID" },
	{ T_UNSPEC,	"UNSPEC" },
	{ T_UNSPECA,	"UNSPECA" },
	{ T_AXFR,	"AXFR" },
	{ T_MAILB,	"MAILB" },
	{ T_MAILA,	"MAILA" },
	{ T_ANY,	"ANY" },
	{ 0,		NULL }
};

static struct tok class2str[] = {
	{ C_IN,		"IN" },		/* Not used */
	{ C_CHAOS,	"CHAOS)" },
	{ C_HS,		"HS" },
	{ C_ANY,	"ANY" },
	{ 0,		NULL }
};

/* print a query */
static const u_char *
ns_qprint(register const u_char *cp, register const u_char *bp)
{
	register const u_char *np = cp;
	register u_int i;

	cp = ns_nskip(cp, bp);

	if (cp + 4 > snapend || cp == NULL)
		return(NULL);

	/* print the qtype and qclass (if it's not IN) */
	i = *cp++ << 8;
	i |= *cp++;
	printf(" %s", tok2str(type2str, "Type%d", i));
	i = *cp++ << 8;
	i |= *cp++;
	if (i != C_IN)
		printf(" %s", tok2str(class2str, "(Class %d)", i));

	fputs("? ", stdout);
	cp = ns_nprint(np, bp);
	return(cp ? cp + 4 : NULL);
}

/* print a reply */
static const u_char *
ns_rprint(register const u_char *cp, register const u_char *bp)
{
	register u_int class;
	register u_short typ, len;
	register const u_char *rp;

	if (vflag) {
		putchar(' ');
		if ((cp = ns_nprint(cp, bp)) == NULL)
			return NULL;
	} else
		cp = ns_nskip(cp, bp);

	if (cp + 10 > snapend || cp == NULL)
		return (snapend);

	/* print the type/qtype and class (if it's not IN) */
	typ = *cp++ << 8;
	typ |= *cp++;
	class = *cp++ << 8;
	class |= *cp++;
	if (class != C_IN && typ != T_OPT)
		printf(" %s", tok2str(class2str, "(Class %d)", class));

	/* ignore ttl */
	cp += 4;

	len = *cp++ << 8;
	len |= *cp++;

	rp = cp + len;

	printf(" %s", tok2str(type2str, "Type%d", typ));
	if (rp > snapend)
		return(NULL);

	switch (typ) {
	case T_A:
		if (cp + sizeof(struct in_addr) > snapend)
			return(NULL);
		printf(" %s", ipaddr_string(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 (cp + 5 * 4 > snapend)
			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 (cp + 2 > snapend)
			return(NULL);
		if (ns_nprint(cp + 2, bp) == NULL)
			return(NULL);
		printf(" %d", EXTRACT_16BITS(cp));
		break;

	case T_TXT:
		putchar(' ');
		(void)ns_cprint(cp, bp);
		break;

#ifdef INET6
	case T_AAAA:
		if (cp + sizeof(struct in6_addr) > snapend)
			return(NULL);
		printf(" %s", ip6addr_string(cp));
		break;

	case T_A6:
	    {
		struct in6_addr a;
		int pbit, pbyte;

		pbit = *cp;
		pbyte = (pbit & ~7) / 8;
		if (pbit > 128) {
			printf(" %u(bad plen)", pbit);
			break;
		} else if (pbit < 128) {
			memset(&a, 0, sizeof(a));
			memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte);
			printf(" %u %s", pbit, ip6addr_string(&a));
		}
		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);
		break;

	case T_UNSPECA:		/* One long string */
		if (cp + len > snapend)
			return(NULL);
		fn_printn(cp, len, snapend);
		break;
	}
	return (rp);		/* XXX This isn't always right */
}

void
ns_print(register const u_char *bp, u_int length)
{
	register const HEADER *np;
	register int qdcount, ancount, nscount, arcount;
	register const u_char *cp = NULL;

	np = (const HEADER *)bp;
	/* get the byte-order right */
	qdcount = ntohs(np->qdcount);
	ancount = ntohs(np->ancount);
	nscount = ntohs(np->nscount);
	arcount = ntohs(np->arcount);

	if (DNS_QR(np)) {
		/* this is a response */
		printf(" %d%s%s%s%s%s%s",
			ntohs(np->id),
			ns_ops[DNS_OPCODE(np)],
			ns_resp[DNS_RCODE(np)],
			DNS_AA(np)? "*" : "",
			DNS_RA(np)? "" : "-",
			DNS_TC(np)? "|" : "",
			DNS_CD(np)? "%" : "");

		if (qdcount != 1)
			printf(" [%dq]", qdcount);
		/* Print QUESTION section on -vv */
		if (vflag > 1) {
			fputs(" q:", stdout);
			if ((cp = ns_qprint((const u_char *)(np + 1), bp))
			    == NULL)
				goto trunc;
		} else {
			if ((cp = ns_nskip((const u_char *)(np + 1), bp))
			    == NULL)
				goto trunc;
			cp += 4;
		}
		printf(" %d/%d/%d", ancount, nscount, arcount);
		if (ancount--) {
			if ((cp = ns_rprint(cp, bp)) == NULL)
				goto trunc;
			while (ancount-- && cp < snapend) {
				putchar(',');
				if ((cp = ns_rprint(cp, bp)) == NULL)
					goto trunc;
			}
		}
		/* Print NS and AR sections on -vv */
		if (vflag > 1) {
			if (nscount-- && cp < snapend) {
				fputs(" ns:", stdout);
				if ((cp = ns_rprint(cp, bp)) == NULL)
					goto trunc;
				while (nscount-- && cp < snapend) {
					putchar(',');
					if ((cp = ns_rprint(cp, bp)) == NULL)
						goto trunc;
				}
			}
			if (arcount-- && cp < snapend) {
				fputs(" ar:", stdout);
				if ((cp = ns_rprint(cp, bp)) == NULL)
					goto trunc;
				while (arcount-- && cp < snapend) {
					putchar(',');
					if ((cp = ns_rprint(cp, bp)) == NULL)
						goto trunc;
				}
			}
		}
	}
	else {
		/* this is a request */
		printf(" %d%s%s%s", ntohs(np->id), ns_ops[DNS_OPCODE(np)],
		    DNS_RD(np) ? "+" : "",
		    DNS_AD(np) ? "$" : "");

		/* any weirdness? */
		if (*(((u_short *)np)+1) & htons(0x6cf))
			printf(" [b2&3=0x%x]", ntohs(*(((u_short *)np)+1)));

		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);

		if (qdcount--) {
			cp = ns_qprint((const u_char *)(np + 1),
				       (const u_char *)np);
			if (!cp)
				goto trunc;
			if ((cp = ns_rprint(cp, bp)) == NULL)
				goto trunc;
			while (qdcount-- && cp < snapend) {
				cp = ns_qprint((const u_char *)cp,
					       (const u_char *)np);
				if (!cp)
					goto trunc;
				if ((cp = ns_rprint(cp, bp)) == NULL)
					goto trunc;
			}
		}

		/* Print remaining sections on -vv */
		if (vflag > 1) {
			if (ancount--) {
				if ((cp = ns_rprint(cp, bp)) == NULL)
					goto trunc;
				while (ancount-- && cp < snapend) {
					putchar(',');
					if ((cp = ns_rprint(cp, bp)) == NULL)
						goto trunc;
				}
			}
			if (nscount-- && cp < snapend) {
				fputs(" ns:", stdout);
				if ((cp = ns_rprint(cp, bp)) == NULL)
					goto trunc;
				while (nscount-- && cp < snapend) {
					putchar(',');
					if ((cp = ns_rprint(cp, bp)) == NULL)
						goto trunc;
				}
			}
			if (arcount-- && cp < snapend) {
				fputs(" ar:", stdout);
				if ((cp = ns_rprint(cp, bp)) == NULL)
					goto trunc;
				while (arcount-- && cp < snapend) {
					putchar(',');
					if ((cp = ns_rprint(cp, bp)) == NULL)
						goto trunc;
				}
			}
		}
	}
	printf(" (%d)", length);
	return;

  trunc:
	printf("[|domain]");
	return;
}