lwres.h

bind 9.3结合mysql数据库

/*
 * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 2000, 2001  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: lwres.h,v 1.49.12.3 2004/03/08 09:05:11 marka Exp $ */

#ifndef LWRES_LWRES_H
#define LWRES_LWRES_H 1

#include <stdio.h>

#include <lwres/context.h>
#include <lwres/lang.h>
#include <lwres/list.h>
#include <lwres/lwpacket.h>
#include <lwres/platform.h>

/*
 * Design notes:
 *
 * Each opcode has two structures and three functions which operate on each
 * structure.  For example, using the "no operation/ping" opcode as an
 * example:
 *
 *	lwres_nooprequest_t:
 *
 *		lwres_nooprequest_render() takes a lwres_nooprequest_t and
 *		and renders it into wire format, storing the allocated
 *		buffer information in a passed-in buffer.  When this buffer
 *		is no longer needed, it must be freed by
 *		lwres_context_freemem().  All other memory used by the
 *		caller must be freed manually, including the
 *		lwres_nooprequest_t passed in.
 *
 *		lwres_nooprequest_parse() takes a wire format message and
 *		breaks it out into a lwres_nooprequest_t.  The structure
 *		must be freed via lwres_nooprequest_free() when it is no longer
 *		needed.
 *
 *		lwres_nooprequest_free() releases into the lwres_context_t
 *		any space allocated during parsing.
 *
 *	lwres_noopresponse_t:
 *
 *		The functions used are similar to the three used for
 *		requests, just with different names.
 *
 * Typically, the client will use request_render, response_parse, and
 * response_free, while the daemon will use request_parse, response_render,
 * and request_free.
 *
 * The basic flow of a typical client is:
 *
 *	fill in a request_t, and call the render function.
 *
 *	Transmit the buffer returned to the daemon.
 *
 *	Wait for a response.
 *
 *	When a response is received, parse it into a response_t.
 *
 *	free the request buffer using lwres_context_freemem().
 *
 *	free the response structure and its associated buffer using
 *	response_free().
 */

#define LWRES_UDP_PORT		921
#define LWRES_RECVLENGTH	16384
#define LWRES_ADDR_MAXLEN	16	/* changing this breaks ABI */
#define LWRES_RESOLV_CONF	"/etc/resolv.conf"

/*
 * Flags.
 *
 * 	These flags are only relevant to rrset queries.
 *
 *	TRUSTNOTREQUIRED:  DNSSEC is not required (input)
 *	SECUREDATA: The data was crypto-verified with DNSSEC (output)
 *
 */
#define LWRES_FLAG_TRUSTNOTREQUIRED	0x00000001U
#define LWRES_FLAG_SECUREDATA		0x00000002U

/*
 * no-op
 */
#define LWRES_OPCODE_NOOP		0x00000000U

typedef struct {
	/* public */
	lwres_uint16_t			datalength;
	unsigned char		       *data;
} lwres_nooprequest_t;

typedef struct {
	/* public */
	lwres_uint16_t			datalength;
	unsigned char		       *data;
} lwres_noopresponse_t;

/*
 * get addresses by name
 */
#define LWRES_OPCODE_GETADDRSBYNAME	0x00010001U

typedef struct lwres_addr lwres_addr_t;
typedef LWRES_LIST(lwres_addr_t) lwres_addrlist_t;

struct lwres_addr {
	lwres_uint32_t			family;
	lwres_uint16_t			length;
	unsigned char			address[LWRES_ADDR_MAXLEN];
	LWRES_LINK(lwres_addr_t)	link;
};

typedef struct {
	/* public */
	lwres_uint32_t			flags;
	lwres_uint32_t			addrtypes;
	lwres_uint16_t			namelen;
	char			       *name;
} lwres_gabnrequest_t;

typedef struct {
	/* public */
	lwres_uint32_t			flags;
	lwres_uint16_t			naliases;
	lwres_uint16_t			naddrs;
	char			       *realname;
	char			      **aliases;
	lwres_uint16_t			realnamelen;
	lwres_uint16_t		       *aliaslen;
	lwres_addrlist_t		addrs;
	/* if base != NULL, it will be freed when this structure is freed. */
	void			       *base;
	size_t				baselen;
} lwres_gabnresponse_t;

/*
 * get name by address
 */
#define LWRES_OPCODE_GETNAMEBYADDR	0x00010002U
typedef struct {
	/* public */
	lwres_uint32_t			flags;
	lwres_addr_t			addr;
} lwres_gnbarequest_t;

typedef struct {
	/* public */
	lwres_uint32_t			flags;
	lwres_uint16_t			naliases;
	char			       *realname;
	char			      **aliases;
	lwres_uint16_t			realnamelen;
	lwres_uint16_t		       *aliaslen;
	/* if base != NULL, it will be freed when this structure is freed. */
	void			       *base;
	size_t				baselen;
} lwres_gnbaresponse_t;

/*
 * get rdata by name
 */
#define LWRES_OPCODE_GETRDATABYNAME	0x00010003U

typedef struct {
	/* public */
	lwres_uint32_t			flags;
	lwres_uint16_t			rdclass;
	lwres_uint16_t			rdtype;
	lwres_uint16_t			namelen;
	char			       *name;
} lwres_grbnrequest_t;

typedef struct {
	/* public */
	lwres_uint32_t			flags;
	lwres_uint16_t			rdclass;
	lwres_uint16_t			rdtype;
	lwres_uint32_t			ttl;
	lwres_uint16_t			nrdatas;
	lwres_uint16_t			nsigs;
	char			       *realname;
	lwres_uint16_t			realnamelen;
	unsigned char		      **rdatas;
	lwres_uint16_t		       *rdatalen;
	unsigned char		      **sigs;
	lwres_uint16_t		       *siglen;
	/* if base != NULL, it will be freed when this structure is freed. */
	void			       *base;
	size_t				baselen;
} lwres_grbnresponse_t;

#define LWRDATA_VALIDATED	0x00000001

/*
 * resolv.conf data
 */

#define LWRES_CONFMAXNAMESERVERS 3	/* max 3 "nameserver" entries */
#define LWRES_CONFMAXLWSERVERS 1	/* max 1 "lwserver" entry */
#define LWRES_CONFMAXSEARCH 8		/* max 8 domains in "search" entry */
#define LWRES_CONFMAXLINELEN 256	/* max size of a line */
#define LWRES_CONFMAXSORTLIST 10
typedef struct {
	lwres_context_t *lwctx;
	lwres_addr_t    nameservers[LWRES_CONFMAXNAMESERVERS];
	lwres_uint8_t	nsnext;		/* index for next free slot */

	lwres_addr_t	lwservers[LWRES_CONFMAXLWSERVERS];
	lwres_uint8_t	lwnext;		/* index for next free slot */

	char	       *domainname;

	char 	       *search[LWRES_CONFMAXSEARCH];
	lwres_uint8_t	searchnxt;	/* index for next free slot */

	struct {
		lwres_addr_t addr;
		/* mask has a non-zero 'family' and 'length' if set */
		lwres_addr_t mask;
	} sortlist[LWRES_CONFMAXSORTLIST];
	lwres_uint8_t	sortlistnxt;

	lwres_uint8_t	resdebug;      /* non-zero if 'options debug' set */
	lwres_uint8_t	ndots;	       /* set to n in 'options ndots:n' */
	lwres_uint8_t	no_tld_query;  /* non-zero if 'options no_tld_query' */
} lwres_conf_t;

#define LWRES_ADDRTYPE_V4		0x00000001U	/* ipv4 */
#define LWRES_ADDRTYPE_V6		0x00000002U	/* ipv6 */

#define LWRES_MAX_ALIASES		16		/* max # of aliases */
#define LWRES_MAX_ADDRS			64		/* max # of addrs */

LWRES_LANG_BEGINDECLS

/*
 * This is in host byte order.
 */
LIBLWRES_EXTERNAL_DATA extern lwres_uint16_t lwres_udp_port;

LIBLWRES_EXTERNAL_DATA extern const char *lwres_resolv_conf;

lwres_result_t
lwres_gabnrequest_render(lwres_context_t *ctx, lwres_gabnrequest_t *req,
			 lwres_lwpacket_t *pkt, lwres_buffer_t *b);

lwres_result_t
lwres_gabnresponse_render(lwres_context_t *ctx, lwres_gabnresponse_t *req,
			  lwres_lwpacket_t *pkt, lwres_buffer_t *b);

lwres_result_t
lwres_gabnrequest_parse(lwres_context_t *ctx, lwres_buffer_t *b,
			lwres_lwpacket_t *pkt, lwres_gabnrequest_t **structp);

lwres_result_t
lwres_gabnresponse_parse(lwres_context_t *ctx, lwres_buffer_t *b,
			 lwres_lwpacket_t *pkt,
			 lwres_gabnresponse_t **structp);

void
lwres_gabnrequest_free(lwres_context_t *ctx, lwres_gabnrequest_t **structp);
/*
 * Frees any dynamically allocated memory for this structure.
 *
 * Requires:
 *
 *	ctx != NULL, and be a context returned via lwres_contextcreate().
 *
 *	structp != NULL && *structp != NULL.
 *
 * Ensures:
 *
 *	*structp == NULL.