rdata.c

bind-3.2.

		COMPARE("ch", dns_rdataclass_chaos);
		COMPARE("chaos", dns_rdataclass_chaos);

		if (source->length > 5 &&
		    source->length < (5 + sizeof("65000")) &&
		    strncasecmp("class", source->base, 5) == 0) {
			char buf[sizeof("65000")];
			char *endp;
			unsigned int val;

			strncpy(buf, source->base + 5, source->length - 5);
			buf[source->length - 5] = '\0';
			val = strtoul(buf, &endp, 10);
			if (*endp == '\0' && val <= 0xffff) {
				*classp = (dns_rdataclass_t)val;
				return (ISC_R_SUCCESS);
			}
		}
		break;
	case 'h':
		COMPARE("hs", dns_rdataclass_hs);
		COMPARE("hesiod", dns_rdataclass_hs);
		break;
	case 'i':
		COMPARE("in", dns_rdataclass_in);
		break;
	case 'n':
		COMPARE("none", dns_rdataclass_none);
		break;
	case 'r':
		COMPARE("reserved0", dns_rdataclass_reserved0);
		break;
	}

#undef COMPARE

	return (DNS_R_UNKNOWN);
}

isc_result_t
dns_rdataclass_totext(dns_rdataclass_t rdclass, isc_buffer_t *target) {
	char buf[sizeof("CLASS65535")];

	switch (rdclass) {
	case dns_rdataclass_any:
		return (str_totext("ANY", target));
	case dns_rdataclass_chaos:
		return (str_totext("CH", target));
	case dns_rdataclass_hs:
		return (str_totext("HS", target));
	case dns_rdataclass_in:
		return (str_totext("IN", target));
	case dns_rdataclass_none:
		return (str_totext("NONE", target));
	case dns_rdataclass_reserved0:
		return (str_totext("RESERVED0", target));
	default:
		sprintf(buf, "CLASS%u", rdclass);
		return (str_totext(buf, target));
	}
}

void
dns_rdataclass_format(dns_rdataclass_t rdclass,
		      char *array, unsigned int size)
{
	isc_result_t result;
	isc_buffer_t buf;

	isc_buffer_init(&buf, array, size);
	result = dns_rdataclass_totext(rdclass, &buf);
	/*
	 * Null terminate.
	 */
	if (result == ISC_R_SUCCESS) {
		if (isc_buffer_availablelength(&buf) >= 1)
			isc_buffer_putuint8(&buf, 0);
		else
			result = ISC_R_NOSPACE;
	}
	if (result != ISC_R_SUCCESS) {
		snprintf(array, size, "<unknown>");
		array[size - 1] = '\0';
	}
}

isc_result_t
dns_rdatatype_fromtext(dns_rdatatype_t *typep, isc_textregion_t *source) {
	unsigned int hash;
	unsigned int n;
	unsigned char a, b;

	n = source->length;

	if (n == 0)
		return (DNS_R_UNKNOWN);

	a = tolower((unsigned char)source->base[0]);
	b = tolower((unsigned char)source->base[n - 1]);

	hash = ((a + n) * b) % 256;

	/*
	 * This switch block is inlined via #define, and will use "return"
	 * to return a result to the caller if it is a valid (known)
	 * rdatatype name.
	 */
	RDATATYPE_FROMTEXT_SW(hash, source->base, n, typep);

	if (source->length > 4 && source->length < (4 + sizeof("65000")) &&
	    strncasecmp("type", source->base, 4) == 0) {
		char buf[sizeof("65000")];
		char *endp;
		unsigned int val;

		strncpy(buf, source->base + 4, source->length - 4);
		buf[source->length - 4] = '\0';
		val = strtoul(buf, &endp, 10);
		if (*endp == '\0' && val <= 0xffff) {
			*typep = (dns_rdatatype_t)val;
			return (ISC_R_SUCCESS);
		}
	}

	return (DNS_R_UNKNOWN);
}

isc_result_t
dns_rdatatype_totext(dns_rdatatype_t type, isc_buffer_t *target) {
	char buf[sizeof("TYPE65536")];

	if (type < (sizeof(typeattr)/sizeof(typeattr[0])))
		return (str_totext(typeattr[type].name, target));
	snprintf(buf, sizeof buf, "TYPE%u", type);
	return (str_totext(buf, target));
}

void
dns_rdatatype_format(dns_rdatatype_t rdtype,
		     char *array, unsigned int size)
{
	isc_result_t result;
	isc_buffer_t buf;

	isc_buffer_init(&buf, array, size);
	result = dns_rdatatype_totext(rdtype, &buf);
	/*
	 * Null terminate.
	 */
	if (result == ISC_R_SUCCESS) {
		if (isc_buffer_availablelength(&buf) >= 1)
			isc_buffer_putuint8(&buf, 0);
		else
			result = ISC_R_NOSPACE;
	}
	if (result != ISC_R_SUCCESS) {
		snprintf(array, size, "<unknown>");
		array[size - 1] = '\0';
	}
}


/* XXXRTH  Should we use a hash table here? */

isc_result_t
dns_rcode_fromtext(dns_rcode_t *rcodep, isc_textregion_t *source) {
	unsigned int value;
	RETERR(dns_mnemonic_fromtext(&value, source, rcodes, 0xffff));
	*rcodep = value;
	return (ISC_R_SUCCESS);
}

isc_result_t
dns_rcode_totext(dns_rcode_t rcode, isc_buffer_t *target) {
	return (dns_mnemonic_totext(rcode, target, rcodes));
}

isc_result_t
dns_tsigrcode_fromtext(dns_rcode_t *rcodep, isc_textregion_t *source) {
	unsigned int value;
	RETERR(dns_mnemonic_fromtext(&value, source, tsigrcodes, 0xffff));
	*rcodep = value;
	return (ISC_R_SUCCESS);
}

isc_result_t
dns_tsigrcode_totext(dns_rcode_t rcode, isc_buffer_t *target) {
	return (dns_mnemonic_totext(rcode, target, tsigrcodes));
}

isc_result_t
dns_cert_fromtext(dns_cert_t *certp, isc_textregion_t *source) {
	unsigned int value;
	RETERR(dns_mnemonic_fromtext(&value, source, certs, 0xffff));
	*certp = value;
	return (ISC_R_SUCCESS);
}

isc_result_t
dns_cert_totext(dns_cert_t cert, isc_buffer_t *target) {
	return (dns_mnemonic_totext(cert, target, certs));
}

isc_result_t
dns_secalg_fromtext(dns_secalg_t *secalgp, isc_textregion_t *source) {
	unsigned int value;
	RETERR(dns_mnemonic_fromtext(&value, source, secalgs, 0xff));
	*secalgp = value;
	return (ISC_R_SUCCESS);
}

isc_result_t
dns_secalg_totext(dns_secalg_t secalg, isc_buffer_t *target) {
	return (dns_mnemonic_totext(secalg, target, secalgs));
}

isc_result_t
dns_secproto_fromtext(dns_secproto_t *secprotop, isc_textregion_t *source) {
	unsigned int value;
	RETERR(dns_mnemonic_fromtext(&value, source, secprotos, 0xff));
	*secprotop = value;
	return (ISC_R_SUCCESS);
}

isc_result_t
dns_secproto_totext(dns_secproto_t secproto, isc_buffer_t *target) {
	return (dns_mnemonic_totext(secproto, target, secprotos));
}

isc_result_t
dns_keyflags_fromtext(dns_keyflags_t *flagsp, isc_textregion_t *source)
{
	char *text, *end;
	unsigned int value, mask;

	if (isdigit(source->base[0] & 0xff) &&
	    source->length <= NUMBERSIZE - 1) {
		unsigned int n;
		char *e;
		char buffer[NUMBERSIZE];
		/*
		 * We have a potential number.  Try to parse it with strtoul().
		 * strtoul() requires null termination, so we must make
		 * a copy.
		 */
		strncpy(buffer, source->base, NUMBERSIZE);
		INSIST(buffer[source->length] == '\0');

		n = strtoul(buffer, &e, 0); /* Allow hex/octal. */
		if (*e == 0) {
			if (n > 0xffff)
				return (ISC_R_RANGE);
			*flagsp = n;
			return (ISC_R_SUCCESS);
		}
		/* It was not a number after all; fall through. */
	}

	text = source->base;
	end = source->base + source->length;
	value = mask = 0;

	while (text < end) {
		struct keyflag *p;
		unsigned int len;
		char *delim = memchr(text, '|', end - text);
		if (delim != NULL)
			len = delim - text;
		else
			len = end - text;
		for (p = keyflags; p->name != NULL; p++) {
			if (strncasecmp(p->name, text, len) == 0)
				break;
		}
		if (p->name == NULL)
			return (DNS_R_UNKNOWN);
		value |= p->value;
#ifdef notyet
		if ((mask & p->mask) != 0)
			warn("overlapping key flags");
#endif
		mask |= p->mask;
		text += len;
		if (delim != NULL)
			text++;	/* Skip "|" */
	}
	*flagsp = value;
	return (ISC_R_SUCCESS);
}

/*
 * Private function.
 */

static unsigned int
name_length(dns_name_t *name) {
	return (name->length);
}

static isc_result_t
txt_totext(isc_region_t *source, isc_buffer_t *target) {
	unsigned int tl;
	unsigned int n;
	unsigned char *sp;
	char *tp;
	isc_region_t region;

	isc_buffer_availableregion(target, &region);
	sp = source->base;
	tp = (char *)region.base;
	tl = region.length;

	n = *sp++;

	REQUIRE(n + 1 <= source->length);

	if (tl < 1)
		return (ISC_R_NOSPACE);
	*tp++ = '"';
	tl--;
	while (n--) {
		if (*sp < 0x20 || *sp >= 0x7f) {
			if (tl < 4)
				return (ISC_R_NOSPACE);
			sprintf(tp, "\\%03u", *sp++);
			tp += 4;
			tl -= 4;
			continue;
		}
		if (*sp == 0x22 || *sp == 0x3b || *sp == 0x5c) {
			if (tl < 2)
				return (ISC_R_NOSPACE);
			*tp++ = '\\';
			tl--;
		}
		if (tl < 1)
			return (ISC_R_NOSPACE);
		*tp++ = *sp++;
		tl--;
	}
	if (tl < 1)
		return (ISC_R_NOSPACE);
	*tp++ = '"';
	tl--;
	isc_buffer_add(target, tp - (char *)region.base);
	isc_region_consume(source, *source->base + 1);
	return (ISC_R_SUCCESS);
}

static isc_result_t
txt_fromtext(isc_textregion_t *source, isc_buffer_t *target) {
	isc_region_t tregion;
	isc_boolean_t escape;
	unsigned int n, nrem;
	char *s;
	unsigned char *t;
	int d;
	int c;

	isc_buffer_availableregion(target, &tregion);
	s = source->base;
	n = source->length;
	t = tregion.base;
	nrem = tregion.length;
	escape = ISC_FALSE;
	if (nrem < 1)
		return (ISC_R_NOSPACE);
	/*
	 * Length byte.
	 */
	nrem--;
	t++;
	/*
	 * Maximum text string length.
	 */
	if (nrem > 255)
		nrem = 255;
	while (n-- != 0) {
		c = (*s++) & 0xff;
		if (escape && (d = decvalue((char)c)) != -1) {
			c = d;
			if (n == 0)
				return (DNS_R_SYNTAX);
			n--;
			if ((d = decvalue(*s++)) != -1)
				c = c * 10 + d;
			else
				return (DNS_R_SYNTAX);
			if (n == 0)
				return (DNS_R_SYNTAX);
			n--;
			if ((d = decvalue(*s++)) != -1)
				c = c * 10 + d;
			else
				return (DNS_R_SYNTAX);
			if (c > 255)
				return (DNS_R_SYNTAX);
		} else if (!escape && c == '\\') {
			escape = ISC_TRUE;
			continue;
		}
		escape = ISC_FALSE;
		if (nrem == 0)
			return (ISC_R_NOSPACE);
		*t++ = c;
		nrem--;
	}
	if (escape)
		return (DNS_R_SYNTAX);
	*tregion.base = t - tregion.base - 1;
	isc_buffer_add(target, *tregion.base + 1);
	return (ISC_R_SUCCESS);
}

static isc_result_t
txt_fromwire(isc_buffer_t *source, isc_buffer_t *target) {
	unsigned int n;
	isc_region_t sregion;
	isc_region_t tregion;

	isc_buffer_activeregion(source, &sregion);
	if (sregion.length == 0)
		return(ISC_R_UNEXPECTEDEND);
	n = *sregion.base + 1;
	if (n > sregion.length)
		return (ISC_R_UNEXPECTEDEND);

	isc_buffer_availableregion(target, &tregion);
	if (n > tregion.length)
		return (ISC_R_NOSPACE);

	memcpy(tregion.base, sregion.base, n);
	isc_buffer_forward(source, n);
	isc_buffer_add(target, n);
	return (ISC_R_SUCCESS);
}

static isc_boolean_t
name_prefix(dns_name_t *name, dns_name_t *origin, dns_name_t *target) {
	int l1, l2;

	if (origin == NULL)
		goto return_false;

	if (dns_name_compare(origin, dns_rootname) == 0)
		goto return_false;

	if (!dns_name_issubdomain(name, origin))
		goto return_false;

	l1 = dns_name_countlabels(name);
	l2 = dns_name_countlabels(origin);

	if (l1 == l2)
		goto return_false;

	dns_name_getlabelsequence(name, 0, l1 - l2, target);
	return (ISC_TRUE);

return_false:
	*target = *name;
	return (ISC_FALSE);
}

static isc_result_t
str_totext(const char *source, isc_buffer_t *target) {
	unsigned int l;
	isc_region_t region;

	isc_buffer_availableregion(target, &region);
	l = strlen(source);

	if (l > region.length)
		return (ISC_R_NOSPACE);

	memcpy(region.base, source, l);
	isc_buffer_add(target, l);
	return (ISC_R_SUCCESS);
}

static isc_result_t
inet_totext(int af, isc_region_t *src, isc_buffer_t *target) {
	char tmpbuf[64];

	/* Note - inet_ntop doesn't do size checking on its input. */
	if (inet_ntop(af, src->base, tmpbuf, sizeof(tmpbuf)) == NULL)
		return (ISC_R_NOSPACE);
	if (strlen(tmpbuf) > isc_buffer_availablelength(target))
		return (ISC_R_NOSPACE);
	isc_buffer_putstr(target, tmpbuf);
	return (ISC_R_SUCCESS);
}

static isc_boolean_t
buffer_empty(isc_buffer_t *source) {
	return((source->current == source->active) ? ISC_TRUE : ISC_FALSE);
}

static void
buffer_fromregion(isc_buffer_t *buffer, isc_region_t *region) {
	isc_buffer_init(buffer, region->base, region->length);
	isc_buffer_add(buffer, region->length);
	isc_buffer_setactive(buffer, region->length);
}

static isc_result_t
uint32_tobuffer(isc_uint32_t value, isc_buffer_t *target) {
	isc_region_t region;

	isc_buffer_availableregion(target, &region);
	if (region.length < 4)
		return (ISC_R_NOSPACE);
	isc_buffer_putuint32(target, value);
	return (ISC_R_SUCCESS);
}

static isc_result_t
uint16_tobuffer(isc_uint32_t value, isc_buffer_t *target) {
	isc_region_t region;

	if (value > 0xffff)
		return (ISC_R_RANGE);