rdata.c

bind 9.3结合mysql数据库

	if (rdata != NULL) {
		REQUIRE(DNS_RDATA_INITIALIZED(rdata));
		REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
	}
	if (callbacks != NULL) {
		REQUIRE(callbacks->warn != NULL);
		REQUIRE(callbacks->error != NULL);
	}

	st = *target;

	if (callbacks != NULL)
		callback = callbacks->error;
	else
		callback = default_fromtext_callback;

	result = isc_lex_getmastertoken(lexer, &token, isc_tokentype_qstring,
					ISC_FALSE);
	if (result != ISC_R_SUCCESS) {
		name = isc_lex_getsourcename(lexer);
		line = isc_lex_getsourceline(lexer);
		fromtext_error(callback, callbacks, name, line,
			       &token, result);
		return (result);
	}

	if (strcmp(DNS_AS_STR(token), "\\#") == 0)
		result = unknown_fromtext(rdclass, type, lexer, mctx, target);
	else {
		isc_lex_ungettoken(lexer, &token);

		FROMTEXTSWITCH
	}

	/*
	 * Consume to end of line / file.
	 * If not at end of line initially set error code.
	 * Call callback via fromtext_error once if there was an error.
	 */
	do {
		name = isc_lex_getsourcename(lexer);
		line = isc_lex_getsourceline(lexer);
		tresult = isc_lex_gettoken(lexer, lexoptions, &token);
		if (tresult != ISC_R_SUCCESS) {
			if (result == ISC_R_SUCCESS)
				result = tresult;
			if (callback != NULL)
				fromtext_error(callback, callbacks, name,
					       line, NULL, result);
			break;
		} else if (token.type != isc_tokentype_eol &&
			   token.type != isc_tokentype_eof) {
			if (result == ISC_R_SUCCESS)
				result = DNS_R_EXTRATOKEN;
			if (callback != NULL) {
				fromtext_error(callback, callbacks, name,
					       line, &token, result);
				callback = NULL;
			}
		} else if (result != ISC_R_SUCCESS && callback != NULL) {
			fromtext_error(callback, callbacks, name, line,
				       &token, result);
			break;
		} else {
			if (token.type == isc_tokentype_eof)
				fromtext_warneof(lexer, callbacks);
			break;
		}
	} while (1);

	if (rdata != NULL && result == ISC_R_SUCCESS) {
		region.base = isc_buffer_used(&st);
		region.length = isc_buffer_usedlength(target) -
				isc_buffer_usedlength(&st);
		dns_rdata_fromregion(rdata, rdclass, type, &region);
	}
	if (result != ISC_R_SUCCESS) {
		*target = st;
	}
	return (result);
}

static isc_result_t
rdata_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
	     isc_buffer_t *target)
{
	isc_result_t result = ISC_R_NOTIMPLEMENTED;
	isc_boolean_t use_default = ISC_FALSE;
	char buf[sizeof("65535")];
	isc_region_t sr;

	REQUIRE(rdata != NULL);
	REQUIRE(tctx->origin == NULL ||
		dns_name_isabsolute(tctx->origin) == ISC_TRUE);

	/*
	 * Some DynDNS meta-RRs have empty rdata.
	 */
	if ((rdata->flags & DNS_RDATA_UPDATE) != 0) {
		INSIST(rdata->length == 0);
		return (ISC_R_SUCCESS);
	}

	TOTEXTSWITCH

	if (use_default) {
		strlcpy(buf, "\\# ", sizeof(buf));
		result = str_totext(buf, target);
		dns_rdata_toregion(rdata, &sr);
		INSIST(sr.length < 65536);
		snprintf(buf, sizeof(buf), "%u", sr.length);
		result = str_totext(buf, target);
		if (sr.length != 0 && result == ISC_R_SUCCESS) {
			if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
				result = str_totext(" ( ", target);
			else
				result = str_totext(" ", target);
			if (result == ISC_R_SUCCESS)
				result = isc_hex_totext(&sr, tctx->width - 2,
							tctx->linebreak,
							target);
			if (result == ISC_R_SUCCESS &&
			    (tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
				result = str_totext(" )", target);
		}
	}

	return (result);
}

isc_result_t
dns_rdata_totext(dns_rdata_t *rdata, dns_name_t *origin, isc_buffer_t *target)
{
	dns_rdata_textctx_t tctx;

	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));

	/*
	 * Set up formatting options for single-line output.
	 */
	tctx.origin = origin;
	tctx.flags = 0;
	tctx.width = 60;
	tctx.linebreak = " ";
	return (rdata_totext(rdata, &tctx, target));
}

isc_result_t
dns_rdata_tofmttext(dns_rdata_t *rdata, dns_name_t *origin,
		    unsigned int flags, unsigned int width,
		    char *linebreak, isc_buffer_t *target)
{
	dns_rdata_textctx_t tctx;

	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));

	/*
	 * Set up formatting options for formatted output.
	 */
	tctx.origin = origin;
	tctx.flags = flags;
	if ((flags & DNS_STYLEFLAG_MULTILINE) != 0) {
		tctx.width = width;
		tctx.linebreak = linebreak;
	} else {
		tctx.width = 60; /* Used for hex word length only. */
		tctx.linebreak = " ";
	}
	return (rdata_totext(rdata, &tctx, target));
}

isc_result_t
dns_rdata_fromstruct(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
		     dns_rdatatype_t type, void *source,
		     isc_buffer_t *target)
{
	isc_result_t result = ISC_R_NOTIMPLEMENTED;
	isc_buffer_t st;
	isc_region_t region;
	isc_boolean_t use_default = ISC_FALSE;

	REQUIRE(source != NULL);
	if (rdata != NULL) {
		REQUIRE(DNS_RDATA_INITIALIZED(rdata));
		REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
	}

	st = *target;

	FROMSTRUCTSWITCH

	if (use_default)
		(void)NULL;

	if (rdata != NULL && result == ISC_R_SUCCESS) {
		region.base = isc_buffer_used(&st);
		region.length = isc_buffer_usedlength(target) -
				isc_buffer_usedlength(&st);
		dns_rdata_fromregion(rdata, rdclass, type, &region);
	}
	if (result != ISC_R_SUCCESS)
		*target = st;
	return (result);
}

isc_result_t
dns_rdata_tostruct(dns_rdata_t *rdata, void *target, isc_mem_t *mctx) {
	isc_result_t result = ISC_R_NOTIMPLEMENTED;
	isc_boolean_t use_default = ISC_FALSE;

	REQUIRE(rdata != NULL);
	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));

	TOSTRUCTSWITCH

	if (use_default)
		(void)NULL;

	return (result);
}

void
dns_rdata_freestruct(void *source) {
	dns_rdatacommon_t *common = source;
	REQUIRE(source != NULL);

	FREESTRUCTSWITCH
}

isc_result_t
dns_rdata_additionaldata(dns_rdata_t *rdata, dns_additionaldatafunc_t add,
			 void *arg)
{
	isc_result_t result = ISC_R_NOTIMPLEMENTED;
	isc_boolean_t use_default = ISC_FALSE;

	/*
	 * Call 'add' for each name and type from 'rdata' which is subject to
	 * additional section processing.
	 */

	REQUIRE(rdata != NULL);
	REQUIRE(add != NULL);
	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));

	ADDITIONALDATASWITCH

	/* No additional processing for unknown types */
	if (use_default)
		result = ISC_R_SUCCESS;

	return (result);
}

isc_result_t
dns_rdata_digest(dns_rdata_t *rdata, dns_digestfunc_t digest, void *arg) {
	isc_result_t result = ISC_R_NOTIMPLEMENTED;
	isc_boolean_t use_default = ISC_FALSE;
	isc_region_t r;

	/*
	 * Send 'rdata' in DNSSEC canonical form to 'digest'.
	 */

	REQUIRE(rdata != NULL);
	REQUIRE(digest != NULL);
	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));

	DIGESTSWITCH

	if (use_default) {
		dns_rdata_toregion(rdata, &r);
		result = (digest)(arg, &r);
	}

	return (result);
}

isc_boolean_t
dns_rdata_checkowner(dns_name_t *name, dns_rdataclass_t rdclass,
		     dns_rdatatype_t type, isc_boolean_t wildcard)
{
	isc_boolean_t result;

	CHECKOWNERSWITCH
	return (result);
}

isc_boolean_t
dns_rdata_checknames(dns_rdata_t *rdata, dns_name_t *owner, dns_name_t *bad)
{
	isc_boolean_t result;

	CHECKNAMESSWITCH
	return (result);
}

unsigned int
dns_rdatatype_attributes(dns_rdatatype_t type)
{
	RDATATYPE_ATTRIBUTE_SW
	if (type >= (dns_rdatatype_t)128 && type < (dns_rdatatype_t)255)
		return (DNS_RDATATYPEATTR_UNKNOWN | DNS_RDATATYPEATTR_META);
	return (DNS_RDATATYPEATTR_UNKNOWN);
}

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("TYPE65535")];

	RDATATYPE_TOTEXT_SW
	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';
	}
}

/*
 * 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);
			snprintf(tp, 5, "\\%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];