encode.c File Reference

Functions to encode DNS packets. More...

#include <freeradius-devel/io/test_point.h>
#include <freeradius-devel/util/dbuff.h>
#include <freeradius-devel/util/dns.h>
#include <freeradius-devel/util/proto.h>
#include <freeradius-devel/util/struct.h>
#include <freeradius-devel/util/encode.h>
#include "dns.h"
#include "attrs.h"

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Macros
#define	DNS_OPT_HDR_LEN   (4)

Functions
static ssize_t	encode_child (fr_dbuff_t *dbuff, fr_da_stack_t *da_stack, unsigned int depth, fr_dcursor_t *cursor, void *encode_ctx)
static ssize_t	encode_option_hdr (fr_dbuff_marker_t *m, uint16_t option, size_t data_len)
	Macro-like function for encoding an option header. More...
static ssize_t	encode_record (fr_dbuff_t *dbuff, fr_da_stack_t *da_stack, fr_pair_list_t *vps, fr_dict_attr_t const *attr, fr_dns_ctx_t *packet_ctx, uint8_t *counter)
static ssize_t	encode_rfc (fr_dbuff_t *dbuff, fr_da_stack_t *da_stack, unsigned int depth, fr_dcursor_t *cursor, void *encode_ctx)
	Encode an RFC format TLV. More...
static int	encode_test_ctx (void **out, TALLOC_CTX *ctx)
static ssize_t	encode_tlv (fr_dbuff_t *dbuff, fr_da_stack_t *da_stack, unsigned int depth, fr_dcursor_t *cursor, void *encode_ctx)
static ssize_t	encode_value (fr_dbuff_t *dbuff, fr_da_stack_t *da_stack, unsigned int depth, fr_dcursor_t *cursor, void *encode_ctx)
ssize_t	fr_dns_encode (fr_dbuff_t *dbuff, fr_pair_list_t *vps, fr_dns_ctx_t *packet_ctx)
	Encode a DNS packet. More...
static ssize_t	fr_dns_encode_proto (UNUSED TALLOC_CTX *ctx, fr_pair_list_t *vps, uint8_t *data, size_t data_len, void *proto_ctx)
static ssize_t	fr_dns_encode_rr (fr_dbuff_t *dbuff, fr_dcursor_t *cursor, void *encode_ctx)
	Encode a Dns option and any sub-options. More...

Variables
fr_test_point_pair_encode_t	dns_tp_encode_pair
fr_test_point_proto_encode_t	dns_tp_encode_proto

Detailed Description

Functions to encode DNS packets.

Id

3acb03c834f7aa463a8b65296c1ddcbf65728f9e

Author

Alan DeKok (aland.nosp@m.@fre.nosp@m.eradi.nosp@m.us.o.nosp@m.rg)

Copyright

2021 NetworkRADIUS SARL (legal.nosp@m.@net.nosp@m.workr.nosp@m.adiu.nosp@m.s.com)

Definition in file encode.c.

Macro Definition Documentation

DNS_OPT_HDR_LEN

#define DNS_OPT_HDR_LEN   (4)

Definition at line 37 of file encode.c.

Function Documentation

encode_child()

static ssize_t encode_child ( fr_dbuff_t *  dbuff, fr_da_stack_t *  da_stack, unsigned int  depth, fr_dcursor_t *  cursor, void *  encode_ctx  )

static

Definition at line 222 of file encode.c.

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encode_option_hdr()

static ssize_t encode_option_hdr ( fr_dbuff_marker_t *  m, uint16_t  option, size_t  data_len  )

inlinestatic

Macro-like function for encoding an option header.

0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | option-code | option-len | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Parameters

[out]	m	Where to write the 4 byte option header.
[in]	option	The option number (host byte order).
[in]	data_len	The length of the option (host byte order).

Returns

• <0 How much data would have been required as a negative value.
• 4 The length of data written.

Definition at line 70 of file encode.c.

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encode_record()

static ssize_t encode_record ( fr_dbuff_t *  dbuff, fr_da_stack_t *  da_stack, fr_pair_list_t *  vps, fr_dict_attr_t const *  attr, fr_dns_ctx_t *  packet_ctx, uint8_t *  counter  )

static

Definition at line 412 of file encode.c.

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encode_rfc()

static ssize_t encode_rfc ( fr_dbuff_t *  dbuff, fr_da_stack_t *  da_stack, unsigned int  depth, fr_dcursor_t *  cursor, void *  encode_ctx  )

static

Encode an RFC format TLV.

This could be a standard attribute, or a TLV data type. If it's a standard attribute, then vp->da->attr == attribute. Otherwise, attribute may be something else.

Definition at line 286 of file encode.c.

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encode_test_ctx()

static int encode_test_ctx ( void **  out, TALLOC_CTX *  ctx  )

static

Definition at line 512 of file encode.c.

encode_tlv()

static ssize_t encode_tlv ( fr_dbuff_t *  dbuff, fr_da_stack_t *  da_stack, unsigned int  depth, fr_dcursor_t *  cursor, void *  encode_ctx  )

static

Definition at line 324 of file encode.c.

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encode_value()

static ssize_t encode_value ( fr_dbuff_t *  dbuff, fr_da_stack_t *  da_stack, unsigned int  depth, fr_dcursor_t *  cursor, void *  encode_ctx  )

static

Definition at line 79 of file encode.c.

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fr_dns_encode()

ssize_t fr_dns_encode	(	fr_dbuff_t *	dbuff,
		fr_pair_list_t *	vps,
		fr_dns_ctx_t *	packet_ctx
	)

Encode a DNS packet.

Definition at line 451 of file encode.c.

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fr_dns_encode_proto()

static ssize_t fr_dns_encode_proto ( UNUSED TALLOC_CTX *  ctx, fr_pair_list_t *  vps, uint8_t *  data, size_t  data_len, void *  proto_ctx  )

static

Definition at line 526 of file encode.c.

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fr_dns_encode_rr()

static ssize_t fr_dns_encode_rr ( fr_dbuff_t *  dbuff, fr_dcursor_t *  cursor, void *  encode_ctx  )

static

Encode a Dns option and any sub-options.

Parameters

[out]	dbuff	Where to write encoded DHCP attributes.
[in]	cursor	with current VP set to the option to be encoded. Will be advanced to the next option to encode.
[in]	encode_ctx	containing parameters for the encoder.

Returns

• > 0 length of data written.
• < 0 error.

Definition at line 379 of file encode.c.

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Variable Documentation

dns_tp_encode_pair

fr_test_point_pair_encode_t dns_tp_encode_pair

Initial value:

= {
        .test_ctx       = encode_test_ctx,
        .func           = fr_dns_encode_rr,
}

Definition at line 553 of file encode.c.

dns_tp_encode_proto

fr_test_point_proto_encode_t dns_tp_encode_proto

Initial value:

= {
        .test_ctx       = encode_test_ctx,
        .func           = fr_dns_encode_proto
}

Definition at line 559 of file encode.c.