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LWRES_GABN(3) | BIND9 | LWRES_GABN(3) |
NAME¶
lwres_gabnrequest_render, lwres_gabnresponse_render, lwres_gabnrequest_parse, lwres_gabnresponse_parse, lwres_gabnresponse_free, lwres_gabnrequest_free - lightweight resolver getaddrbyname message handlingSYNOPSIS¶
#include <lwres/lwres.h>
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_gabnresponse_free(lwres_context_t *ctx,
lwres_gabnresponse_t **structp);
void
lwres_gabnrequest_free(lwres_context_t *ctx,
lwres_gabnrequest_t **structp);
DESCRIPTION¶
These are low-level routines for creating and parsing lightweight resolver name-to-address lookup request and response messages. There are four main functions for the getaddrbyname opcode. One render function converts a getaddrbyname request structure — lwres_gabnrequest_t — to the lighweight resolver's canonical format. It is complemented by a parse function that converts a packet in this canonical format to a getaddrbyname request structure. Another render function converts the getaddrbyname response structure — lwres_gabnresponse_t — to the canonical format. This is complemented by a parse function which converts a packet in canonical format to a getaddrbyname response structure. These structures are defined in <lwres/lwres.h>. They are shown below.#define LWRES_OPCODE_GETADDRSBYNAME 0x00010001U
typedef struct lwres_addr lwres_addr_t; typedef LWRES_LIST(lwres_addr_t) lwres_addrlist_t;
typedef struct { lwres_uint32_t flags; lwres_uint32_t addrtypes; lwres_uint16_t namelen; char *name; } lwres_gabnrequest_t;
typedef struct { 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; void *base; size_t baselen; } lwres_gabnresponse_t;
RETURN VALUES¶
The getaddrbyname opcode functions lwres_gabnrequest_render(), lwres_gabnresponse_render() lwres_gabnrequest_parse() and lwres_gabnresponse_parse() all return LWRES_R_SUCCESS on success. They return LWRES_R_NOMEMORY if memory allocation fails. LWRES_R_UNEXPECTEDEND is returned if the available space in the buffer b is too small to accommodate the packet header or the lwres_gabnrequest_t and lwres_gabnresponse_t structures. lwres_gabnrequest_parse() and lwres_gabnresponse_parse() will return LWRES_R_UNEXPECTEDEND if the buffer is not empty after decoding the received packet. These functions will return LWRES_R_FAILURE if pktflags in the packet header structure lwres_lwpacket_t indicate that the packet is not a response to an earlier query.SEE ALSO¶
lwres_packet(3)COPYRIGHT¶
Copyright © 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")June 30, 2000 | BIND9 |