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context.h

/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#ifndef LWRES_CONTEXT_H
#define LWRES_CONTEXT_H 1

/*! \file lwres/context.h */

#include <inttypes.h>
#include <stddef.h>

#include <lwres/lang.h>
#include <lwres/result.h>

/*!
 * Used to set various options such as timeout, authentication, etc
 */
typedef struct lwres_context lwres_context_t;

LWRES_LANG_BEGINDECLS

typedef void *(*lwres_malloc_t)(void *arg, size_t length);
typedef void (*lwres_free_t)(void *arg, void *mem, size_t length);

/*
 * XXXMLG
 *
 * Make the server reload /etc/resolv.conf periodically.
 *
 * Make the server do sortlist/searchlist.
 *
 * Client side can disable the search/sortlist processing.
 *
 * Use an array of addresses/masks and searchlist for client-side, and
 * if added to the client disable the processing on the server.
 *
 * Share /etc/resolv.conf data between contexts.
 */

/*!
 * _SERVERMODE
 *	Don't allocate and connect a socket to the server, since the
 *	caller _is_ a server.
 *
 * _USEIPV4, _USEIPV6
 *	Use IPv4 and IPv6 transactions with remote servers, respectively.
 *	For backward compatibility, regard both flags as being set when both
 *	are cleared.
 */
#define LWRES_CONTEXT_SERVERMODE	0x00000001U
#define LWRES_CONTEXT_USEIPV4		0x00000002U
#define LWRES_CONTEXT_USEIPV6		0x00000004U

lwres_result_t
lwres_context_create(lwres_context_t **contextp, void *arg,
		     lwres_malloc_t malloc_function,
		     lwres_free_t free_function,
		     unsigned int flags);
/**<
 * Allocate a lwres context.  This is used in all lwres calls.
 *
 * Memory management can be replaced here by passing in two functions.
 * If one is non-NULL, they must both be non-NULL.  "arg" is passed to
 * these functions.
 *
 * Contexts are not thread safe.  Document at the top of the file.
 * XXXMLG
 *
 * If they are NULL, the standard malloc() and free() will be used.
 *
 *\pre	contextp != NULL && contextp == NULL.
 *
 *\return	Returns 0 on success, non-zero on failure.
 */

void
lwres_context_destroy(lwres_context_t **contextp);
/**<
 * Frees all memory associated with a lwres context.
 *
 *\pre	contextp != NULL && contextp == NULL.
 */

uint32_t
lwres_context_nextserial(lwres_context_t *ctx);
/**<
 * XXXMLG Document
 */

void
lwres_context_initserial(lwres_context_t *ctx, uint32_t serial);

void
lwres_context_freemem(lwres_context_t *ctx, void *mem, size_t len);

void *
lwres_context_allocmem(lwres_context_t *ctx, size_t len);

int
lwres_context_getsocket(lwres_context_t *ctx);

lwres_result_t
lwres_context_send(lwres_context_t *ctx,
		   void *sendbase, int sendlen);

lwres_result_t
lwres_context_recv(lwres_context_t *ctx,
		   void *recvbase, int recvlen,
		   int *recvd_len);

lwres_result_t
lwres_context_sendrecv(lwres_context_t *ctx,
		       void *sendbase, int sendlen,
		       void *recvbase, int recvlen,
		       int *recvd_len);

LWRES_LANG_ENDDECLS

#endif /* LWRES_CONTEXT_H */

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-04-22 10:27:09
..	dir	-	root/root	0755	2025-04-22 10:27:09
context.h	text/x-c	3.17 KB	root/root	0644	2025-02-20 09:05:27
int.h	text/x-c	776 B	root/root	0644	2025-02-20 09:05:27
ipv6.h	text/x-c	2.57 KB	root/root	0644	2025-02-20 09:05:27
lang.h	text/x-c	652 B	root/root	0644	2025-02-20 09:05:27
list.h	text/x-c	3.18 KB	root/root	0644	2025-02-20 09:05:27
lwbuffer.h	text/x-c	8.61 KB	root/root	0644	2025-02-20 09:05:27
lwpacket.h	text/x-c	4.89 KB	root/root	0644	2025-02-20 09:05:27
lwres.h	text/x-c	14.99 KB	root/root	0644	2025-02-20 09:05:27
net.h	text/x-c	3.01 KB	root/root	0644	2025-02-20 09:05:27
netdb.h	text/x-c	12.16 KB	root/root	0644	2025-02-20 09:05:27
platform.h	text/x-c	2.36 KB	root/root	0644	2025-02-20 09:05:27
result.h	text/x-c	1004 B	root/root	0644	2025-02-20 09:05:27
stdlib.h	text/x-c	723 B	root/root	0644	2025-02-20 09:05:27
string.h	text/x-c	729 B	root/root	0644	2025-02-20 09:05:27
version.h	text/x-c	708 B	root/root	0644	2025-02-20 09:05:27

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