encode.c File Reference

Functions to encode DHCP options. More...

#include <freeradius-devel/io/test_point.h>
#include <freeradius-devel/util/dbuff.h>
#include <freeradius-devel/util/proto.h>
#include <freeradius-devel/util/struct.h>
#include <freeradius-devel/util/dns.h>
#include <freeradius-devel/util/encode.h>
#include "dhcpv4.h"
#include "attrs.h"

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Macros
#define	DHCPV4_OPT_HDR_LEN   (2)

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_rfc (fr_dbuff_t *dbuff, fr_da_stack_t *da_stack, unsigned int depth, fr_dcursor_t *cursor, void *encode_ctx)
	Write out an RFC option header and option data. 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)
	Write out a TLV header (and any sub TLVs or values) More...
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)
	Write DHCP option value into buffer. More...
static ssize_t	encode_vsio (fr_dbuff_t *dbuff, fr_da_stack_t *da_stack, unsigned int depth, fr_dcursor_t *cursor, void *encode_ctx)
static ssize_t	encode_vsio_data (fr_dbuff_t *dbuff, fr_da_stack_t *da_stack, unsigned int depth, fr_dcursor_t *cursor, void *encode_ctx)
static ssize_t	extend_option (fr_dbuff_t *dbuff, fr_dbuff_marker_t *hdr, size_t len)
	Extend an encoded option in-place. More...
ssize_t	fr_dhcpv4_encode_foreign (fr_dbuff_t *dbuff, fr_pair_list_t const *list)
ssize_t	fr_dhcpv4_encode_option (fr_dbuff_t *dbuff, fr_dcursor_t *cursor, void *encode_ctx)
	Encode a DHCP option and any sub-options. More...
static ssize_t	fr_dhcpv4_encode_proto (UNUSED TALLOC_CTX *ctx, fr_pair_list_t *vps, uint8_t *data, size_t data_len, UNUSED void *proto_ctx)

Variables
fr_test_point_pair_encode_t	dhcpv4_tp_encode_pair
fr_test_point_proto_encode_t	dhcpv4_tp_encode_proto

Detailed Description

Functions to encode DHCP options.

Id

541edc91f2278b622c5ad1b44db5806b4a42b386

Copyright

2008,2017 The FreeRADIUS server project

2008 Alan DeKok (aland.nosp@m.@dep.nosp@m.loyin.nosp@m.grad.nosp@m.ius.c.nosp@m.om)

2015,2017 Arran Cudbard-Bell (a.cud.nosp@m.bard.nosp@m.b@fre.nosp@m.erad.nosp@m.ius.o.nosp@m.rg)

Definition in file encode.c.

Macro Definition Documentation

DHCPV4_OPT_HDR_LEN

#define DHCPV4_OPT_HDR_LEN   (2)

Definition at line 275 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 358 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

Write out an RFC option header and option data.

Note

May coalesce options with fixed width values

Parameters

[out]	dbuff	buffer to write the TLV to.
[in]	da_stack	Describing nesting of options.
[in]	depth	in the da_stack.
[in,out]	cursor	Current attribute we're encoding.
[in]	encode_ctx	Containing DHCPv4 dictionary.

Returns

• >0 length of data encoded.
• 0 if we ran out of space.
• < 0 on error.

Definition at line 291 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 791 of file encode.c.

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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

Write out a TLV header (and any sub TLVs or values)

Parameters

[out]	dbuff	buffer to write the TLV to.
[in]	da_stack	Describing nesting of options.
[in]	depth	in the da_stack.
[in,out]	cursor	Current attribute we're encoding.
[in]	encode_ctx	Containing DHCPv4 dictionary.

Returns

• >0 length of data encoded.
• 0 if we ran out of space.
• < 0 on error.

Definition at line 435 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

Write DHCP option value into buffer.

Does not include DHCP option length or number.

Parameters

[out]	dbuff	buffer to write the option to.
[in]	da_stack	Describing nesting of options.
[in]	depth	in da_stack.
[in,out]	cursor	Current attribute we're encoding.
[in]	encode_ctx	Containing DHCPv4 dictionary.

Returns

• The length of data written, may return 0 for bools < 0 if there's not enough space or option type is unsupported

Definition at line 58 of file encode.c.

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encode_vsio()

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

static

Definition at line 603 of file encode.c.

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encode_vsio_data()

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

static

Definition at line 512 of file encode.c.

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extend_option()

static ssize_t extend_option ( fr_dbuff_t *  dbuff, fr_dbuff_marker_t *  hdr, size_t  len  )

static

Extend an encoded option in-place.

Parameters

[in]	dbuff	buffer containing the option
[in]	hdr	marker (with dbuff as parent) set to where the option starts
[in]	len	length of the data being written

Returns

• <0 if we can't extend the option
• >0 if we can, with hdr set to where the next option should start

Note

The option starts with a two-byte (type, length) header, where the length does not include the two bytes for the header. The starting length may be non-zero, hence its counting towards the header_byte calculation and its inclusion in sublen calculation. (All those following start out empty, hence the initialization of their lengths to zero.)

Definition at line 190 of file encode.c.

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fr_dhcpv4_encode_foreign()

ssize_t fr_dhcpv4_encode_foreign	(	fr_dbuff_t *	dbuff,
		fr_pair_list_t const *	list
	)

Definition at line 759 of file encode.c.

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fr_dhcpv4_encode_option()

ssize_t fr_dhcpv4_encode_option	(	fr_dbuff_t *	dbuff,
		fr_dcursor_t *	cursor,
		void *	encode_ctx
	)

Encode a DHCP 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 DHCPv4 dictionary.

Returns

• > 0 length of data written.
• < 0 error.
• 0 not valid option for DHCP (skipping).

Definition at line 711 of file encode.c.

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fr_dhcpv4_encode_proto()

static ssize_t fr_dhcpv4_encode_proto ( UNUSED TALLOC_CTX *  ctx, fr_pair_list_t *  vps, uint8_t *  data, size_t  data_len, UNUSED void *  proto_ctx  )

static

Definition at line 786 of file encode.c.

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Variable Documentation

dhcpv4_tp_encode_pair

fr_test_point_pair_encode_t dhcpv4_tp_encode_pair

Initial value:

= {
        .test_ctx       = encode_test_ctx,
        .func           = fr_dhcpv4_encode_option,
        .next_encodable = fr_dhcpv4_next_encodable,
}

Definition at line 808 of file encode.c.

dhcpv4_tp_encode_proto

fr_test_point_proto_encode_t dhcpv4_tp_encode_proto

Initial value:

= {
        .test_ctx       = encode_test_ctx,
        .func           = fr_dhcpv4_encode_proto
}

Definition at line 817 of file encode.c.