rdata.c

bind 9.3结合mysql数据库

/*
 * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1998-2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id: rdata.c,v 1.147.2.11.2.15 2004/03/12 10:31:25 marka Exp $ */

#include <config.h>
#include <ctype.h>

#include <isc/base64.h>
#include <isc/hex.h>
#include <isc/lex.h>
#include <isc/mem.h>
#include <isc/parseint.h>
#include <isc/print.h>
#include <isc/string.h>
#include <isc/stdlib.h>
#include <isc/util.h>

#include <dns/callbacks.h>
#include <dns/cert.h>
#include <dns/compress.h>
#include <dns/enumtype.h>
#include <dns/keyflags.h>
#include <dns/keyvalues.h>
#include <dns/rcode.h>
#include <dns/rdata.h>
#include <dns/rdataclass.h>
#include <dns/rdatastruct.h>
#include <dns/rdatatype.h>
#include <dns/result.h>
#include <dns/secalg.h>
#include <dns/secproto.h>
#include <dns/time.h>
#include <dns/ttl.h>

#define RETERR(x) \
	do { \
		isc_result_t _r = (x); \
		if (_r != ISC_R_SUCCESS) \
			return (_r); \
	} while (0)

#define RETTOK(x) \
	do { \
		isc_result_t _r = (x); \
		if (_r != ISC_R_SUCCESS) { \
			isc_lex_ungettoken(lexer, &token); \
			return (_r); \
		} \
	} while (0)

#define DNS_AS_STR(t) ((t).value.as_textregion.base)

#define ARGS_FROMTEXT	int rdclass, dns_rdatatype_t type, \
			isc_lex_t *lexer, dns_name_t *origin, \
			unsigned int options, isc_buffer_t *target, \
			dns_rdatacallbacks_t *callbacks

#define ARGS_TOTEXT	dns_rdata_t *rdata, dns_rdata_textctx_t *tctx, \
			isc_buffer_t *target

#define ARGS_FROMWIRE	int rdclass, dns_rdatatype_t type, \
			isc_buffer_t *source, dns_decompress_t *dctx, \
			unsigned int options, isc_buffer_t *target

#define ARGS_TOWIRE	dns_rdata_t *rdata, dns_compress_t *cctx, \
			isc_buffer_t *target

#define ARGS_COMPARE	const dns_rdata_t *rdata1, const dns_rdata_t *rdata2

#define ARGS_FROMSTRUCT	int rdclass, dns_rdatatype_t type, \
			void *source, isc_buffer_t *target

#define ARGS_TOSTRUCT	dns_rdata_t *rdata, void *target, isc_mem_t *mctx

#define ARGS_FREESTRUCT void *source

#define ARGS_ADDLDATA	dns_rdata_t *rdata, dns_additionaldatafunc_t add, \
			void *arg

#define ARGS_DIGEST	dns_rdata_t *rdata, dns_digestfunc_t digest, void *arg

#define ARGS_CHECKOWNER dns_name_t *name, dns_rdataclass_t rdclass, \
			dns_rdatatype_t type, isc_boolean_t wildcard

#define ARGS_CHECKNAMES dns_rdata_t *rdata, dns_name_t *owner, dns_name_t *bad


/*
 * Context structure for the totext_ functions.
 * Contains formatting options for rdata-to-text
 * conversion.
 */
typedef struct dns_rdata_textctx {
	dns_name_t *origin;	/* Current origin, or NULL. */
	unsigned int flags;	/* DNS_STYLEFLAG_* */
	unsigned int width;	/* Width of rdata column. */
  	const char *linebreak;	/* Line break string. */
} dns_rdata_textctx_t;

static isc_result_t
txt_totext(isc_region_t *source, isc_buffer_t *target);

static isc_result_t
txt_fromtext(isc_textregion_t *source, isc_buffer_t *target);

static isc_result_t
txt_fromwire(isc_buffer_t *source, isc_buffer_t *target);

static isc_boolean_t
name_prefix(dns_name_t *name, dns_name_t *origin, dns_name_t *target);

static unsigned int
name_length(dns_name_t *name);

static isc_result_t
str_totext(const char *source, isc_buffer_t *target);

static isc_result_t
inet_totext(int af, isc_region_t *src, isc_buffer_t *target);

static isc_boolean_t
buffer_empty(isc_buffer_t *source);

static void
buffer_fromregion(isc_buffer_t *buffer, isc_region_t *region);

static isc_result_t
uint32_tobuffer(isc_uint32_t, isc_buffer_t *target);

static isc_result_t
uint16_tobuffer(isc_uint32_t, isc_buffer_t *target);

static isc_result_t
uint8_tobuffer(isc_uint32_t, isc_buffer_t *target);

static isc_result_t
name_tobuffer(dns_name_t *name, isc_buffer_t *target);

static isc_uint32_t
uint32_fromregion(isc_region_t *region);

static isc_uint16_t
uint16_fromregion(isc_region_t *region);

static isc_uint8_t
uint8_fromregion(isc_region_t *region);

static isc_result_t
mem_tobuffer(isc_buffer_t *target, void *base, unsigned int length);

static int
hexvalue(char value);

static int
decvalue(char value);

static isc_result_t
btoa_totext(unsigned char *inbuf, int inbuflen, isc_buffer_t *target);

static isc_result_t
atob_tobuffer(isc_lex_t *lexer, isc_buffer_t *target);

static void
default_fromtext_callback(dns_rdatacallbacks_t *callbacks, const char *, ...)
     ISC_FORMAT_PRINTF(2, 3);

static void
fromtext_error(void (*callback)(dns_rdatacallbacks_t *, const char *, ...),
	       dns_rdatacallbacks_t *callbacks, const char *name,
	       unsigned long line, isc_token_t *token, isc_result_t result);

static void
fromtext_warneof(isc_lex_t *lexer, dns_rdatacallbacks_t *callbacks);

static isc_result_t
rdata_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
	     isc_buffer_t *target);

static void
warn_badname(dns_name_t *name, isc_lex_t *lexer,
	     dns_rdatacallbacks_t *callbacks);

static inline int
getquad(const void *src, struct in_addr *dst,
	isc_lex_t *lexer, dns_rdatacallbacks_t *callbacks)
{
	int result;
	struct in_addr *tmp;

	result = inet_aton(src, dst);
	if (result == 1 && callbacks != NULL &&
	    inet_pton(AF_INET, src, &tmp) != 1) {
		const char *name = isc_lex_getsourcename(lexer);
		if (name == NULL)
			name = "UNKNOWN";
		(*callbacks->warn)(callbacks, "%s:%lu: \"%s\" "
				   "is not a decimal dotted quad", name,
				   isc_lex_getsourceline(lexer), src);
	}
	return (result);
}

static inline isc_result_t
name_duporclone(dns_name_t *source, isc_mem_t *mctx, dns_name_t *target) {

	if (mctx != NULL)
		return (dns_name_dup(source, mctx, target));
	dns_name_clone(source, target);
	return (ISC_R_SUCCESS);
}

static inline void *
mem_maybedup(isc_mem_t *mctx, void *source, size_t length) {
	void *new;

	if (mctx == NULL)
		return (source);
	new = isc_mem_allocate(mctx, length);
	if (new != NULL)
		memcpy(new, source, length);

	return (new);
}

static const char hexdigits[] = "0123456789abcdef";
static const char decdigits[] = "0123456789";

#include "code.h"

#define META 0x0001
#define RESERVED 0x0002

/***
 *** Initialization
 ***/

void
dns_rdata_init(dns_rdata_t *rdata) {

	REQUIRE(rdata != NULL);

	rdata->data = NULL;
	rdata->length = 0;
	rdata->rdclass = 0;
	rdata->type = 0;
	rdata->flags = 0;
	ISC_LINK_INIT(rdata, link);
	/* ISC_LIST_INIT(rdata->list); */
}

#if 0
#define DNS_RDATA_INITIALIZED(rdata) \
	((rdata)->data == NULL && (rdata)->length == 0 && \
	 (rdata)->rdclass == 0 && (rdata)->type == 0 && (rdata)->flags == 0 && \
	 !ISC_LINK_LINKED((rdata), link))
#else
#ifdef ISC_LIST_CHECKINIT
#define DNS_RDATA_INITIALIZED(rdata) \
	(!ISC_LINK_LINKED((rdata), link))
#else
#define DNS_RDATA_INITIALIZED(rdata) ISC_TRUE
#endif
#endif
#define DNS_RDATA_VALIDFLAGS(rdata) \
	(((rdata)->flags & ~DNS_RDATA_UPDATE) == 0)

void
dns_rdata_reset(dns_rdata_t *rdata) {

	REQUIRE(rdata != NULL);

	REQUIRE(!ISC_LINK_LINKED(rdata, link));
	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));

	rdata->data = NULL;
	rdata->length = 0;
	rdata->rdclass = 0;
	rdata->type = 0;
	rdata->flags = 0;
}

/***
 ***
 ***/

void
dns_rdata_clone(const dns_rdata_t *src, dns_rdata_t *target) {

	REQUIRE(src != NULL);
	REQUIRE(target != NULL);

	REQUIRE(DNS_RDATA_INITIALIZED(target));

	REQUIRE(DNS_RDATA_VALIDFLAGS(src));
	REQUIRE(DNS_RDATA_VALIDFLAGS(target));

	target->data = src->data;
	target->length = src->length;
	target->rdclass = src->rdclass;
	target->type = src->type;
	target->flags = src->flags;
}


/***
 *** Comparisons
 ***/

int
dns_rdata_compare(const dns_rdata_t *rdata1, const dns_rdata_t *rdata2) {
	int result = 0;
	isc_boolean_t use_default = ISC_FALSE;

	REQUIRE(rdata1 != NULL);
	REQUIRE(rdata2 != NULL);
	REQUIRE(rdata1->data != NULL);
	REQUIRE(rdata2->data != NULL);
	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata1));
	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata2));

	if (rdata1->rdclass != rdata2->rdclass)
		return (rdata1->rdclass < rdata2->rdclass ? -1 : 1);

	if (rdata1->type != rdata2->type)
		return (rdata1->type < rdata2->type ? -1 : 1);

	COMPARESWITCH

	if (use_default) {
		isc_region_t r1;
		isc_region_t r2;

		dns_rdata_toregion(rdata1, &r1);
		dns_rdata_toregion(rdata2, &r2);
		result = isc_region_compare(&r1, &r2);
	}
	return (result);
}

/***
 *** Conversions
 ***/

void
dns_rdata_fromregion(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
		     dns_rdatatype_t type, isc_region_t *r)
{

	REQUIRE(rdata != NULL);
	REQUIRE(DNS_RDATA_INITIALIZED(rdata));
	REQUIRE(r != NULL);

	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));

	rdata->data = r->base;
	rdata->length = r->length;
	rdata->rdclass = rdclass;
	rdata->type = type;
	rdata->flags = 0;
}

void
dns_rdata_toregion(const dns_rdata_t *rdata, isc_region_t *r) {

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

	r->base = rdata->data;
	r->length = rdata->length;
}

isc_result_t
dns_rdata_fromwire(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
		   dns_rdatatype_t type, isc_buffer_t *source,
		   dns_decompress_t *dctx, unsigned int options,
		   isc_buffer_t *target)
{
	isc_result_t result = ISC_R_NOTIMPLEMENTED;
	isc_region_t region;
	isc_buffer_t ss;
	isc_buffer_t st;
	isc_boolean_t use_default = ISC_FALSE;
	isc_uint32_t activelength;

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

	if (type == 0)
		return (DNS_R_FORMERR);

	ss = *source;
	st = *target;

	activelength = isc_buffer_activelength(source);
	INSIST(activelength < 65536);

	FROMWIRESWITCH

	if (use_default) {
		if (activelength > isc_buffer_availablelength(target))
			result = ISC_R_NOSPACE;
		else {
			isc_buffer_putmem(target, isc_buffer_current(source),
					  activelength);
			isc_buffer_forward(source, activelength);
			result = ISC_R_SUCCESS;
		}
	}

	/*
	 * We should have consumed all of our buffer.
	 */
	if (result == ISC_R_SUCCESS && !buffer_empty(source))
		result = DNS_R_EXTRADATA;

	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) {
		*source = ss;
		*target = st;
	}
	return (result);
}

isc_result_t
dns_rdata_towire(dns_rdata_t *rdata, dns_compress_t *cctx,
		 isc_buffer_t *target)
{
	isc_result_t result = ISC_R_NOTIMPLEMENTED;
	isc_boolean_t use_default = ISC_FALSE;
	isc_region_t tr;
	isc_buffer_t st;

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

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

	st = *target;

	TOWIRESWITCH

	if (use_default) {
		isc_buffer_availableregion(target, &tr);
		if (tr.length < rdata->length)
			return (ISC_R_NOSPACE);
		memcpy(tr.base, rdata->data, rdata->length);
		isc_buffer_add(target, rdata->length);
		return (ISC_R_SUCCESS);
	}
	if (result != ISC_R_SUCCESS) {
		*target = st;
		INSIST(target->used < 65536);
		dns_compress_rollback(cctx, (isc_uint16_t)target->used);
	}
	return (result);
}

/*
 * If the binary data in 'src' is valid uncompressed wire format
 * rdata of class 'rdclass' and type 'type', return ISC_R_SUCCESS
 * and copy the validated rdata to 'dest'.  Otherwise return an error.
 */
static isc_result_t
rdata_validate(isc_buffer_t *src, isc_buffer_t *dest, dns_rdataclass_t rdclass,
	    dns_rdatatype_t type)
{
	dns_decompress_t dctx;
	dns_rdata_t rdata = DNS_RDATA_INIT;
	isc_result_t result;

	dns_decompress_init(&dctx, -1, DNS_DECOMPRESS_NONE);
	isc_buffer_setactive(src, isc_buffer_usedlength(src));
	result = dns_rdata_fromwire(&rdata, rdclass, type, src,
				    &dctx, 0, dest);
	dns_decompress_invalidate(&dctx);

	return (result);
}

static isc_result_t
unknown_fromtext(dns_rdataclass_t rdclass, dns_rdatatype_t type,
		 isc_lex_t *lexer, isc_mem_t *mctx, isc_buffer_t *target)
{
	isc_result_t result;
	isc_buffer_t *buf = NULL;
	isc_token_t token;

	if (type == 0 || dns_rdatatype_ismeta(type))
		return (DNS_R_METATYPE);

	result = isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
					ISC_FALSE);
	if (result == ISC_R_SUCCESS && token.value.as_ulong > 65535U)
		return (ISC_R_RANGE);
	result = isc_buffer_allocate(mctx, &buf, token.value.as_ulong);
	if (result != ISC_R_SUCCESS)
		return (result);
	
	result = isc_hex_tobuffer(lexer, buf,
				  (unsigned int)token.value.as_ulong);
	if (result != ISC_R_SUCCESS)
	       goto failure;
	if (isc_buffer_usedlength(buf) != token.value.as_ulong) {
		result = ISC_R_UNEXPECTEDEND;
		goto failure;
	}

	if (dns_rdatatype_isknown(type)) {
		result = rdata_validate(buf, target, rdclass, type);
	} else {
		isc_region_t r;
		isc_buffer_usedregion(buf, &r);
		result = isc_buffer_copyregion(target, &r);
	}
	if (result != ISC_R_SUCCESS)
		goto failure;

	isc_buffer_free(&buf);
	return (ISC_R_SUCCESS);

 failure:
	isc_buffer_free(&buf);
	return (result);
}

isc_result_t
dns_rdata_fromtext(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
		   dns_rdatatype_t type, isc_lex_t *lexer,
		   dns_name_t *origin, unsigned int options, isc_mem_t *mctx,
		   isc_buffer_t *target, dns_rdatacallbacks_t *callbacks)
{
	isc_result_t result = ISC_R_NOTIMPLEMENTED;
	isc_region_t region;
	isc_buffer_t st;
	isc_token_t token;
	unsigned int lexoptions = ISC_LEXOPT_EOL | ISC_LEXOPT_EOF |
				  ISC_LEXOPT_DNSMULTILINE | ISC_LEXOPT_ESCAPE;
	char *name;
	unsigned long line;
	void (*callback)(dns_rdatacallbacks_t *, const char *, ...);
	isc_result_t tresult;

	REQUIRE(origin == NULL || dns_name_isabsolute(origin) == ISC_TRUE);