IPv4 addresses

IPv4 address types and helper function. More...

Detailed Description

IPv4 address types and helper function.

Files
file	addr.h
	IPv4 address type and helper functions definitions.

Data Structures
union	ipv4_addr_t
	Data type to represent an IPv4 address. More...

Macros
#define	IPV4_ADDR_MAX_STR_LEN   (sizeof("255.255.255.255"))
	Maximum length of an IPv4 address as string.
#define	IPV4_ADDR_INIT(a, b, c, d)
	Static initializer for an IPv4 address.
#define	IPV4_ADDR_LOOPBACK   IPV4_ADDR_INIT(127, 0, 0, 1)
	Static initializer for the loopback IPv4 address (127.0.0.1)

Functions
static bool	ipv4_addr_equal (const ipv4_addr_t *a, const ipv4_addr_t *b)
	Checks if two IPv4 addresses are equal.
static bool	ipv4_addr_is_multicast (const ipv4_addr_t *addr)
	Check if addr is a multicast address.
char *	ipv4_addr_to_str (char *result, const ipv4_addr_t *addr, uint8_t result_len)
	Converts an IPv4 address to its string representation.
ipv4_addr_t *	ipv4_addr_from_str (ipv4_addr_t *result, const char *addr)
	Converts an IPv4 address string representation to a byte-represented IPv4 address.
ipv4_addr_t *	ipv4_addr_from_buf (ipv4_addr_t *result, const char *addr, size_t addr_len)
	Converts an IPv4 address from a buffer of characters to a byte-represented IPv4 address.
void	ipv4_addr_print (const ipv4_addr_t *addr)
	Print IPv4 address to stdout.

Macro Definition Documentation

IPV4_ADDR_INIT

#define IPV4_ADDR_INIT	(		a,
			b,
			c,
			d )

Value:

{ .u8 = {a, b, c, d} }

Static initializer for an IPv4 address.

Parameters

[in]	a	1st octet
[in]	b	2nd octet
[in]	c	3rd octet
[in]	d	4th octet

Returns

initialized IPv4 address

Definition at line 48 of file addr.h.

IPV4_ADDR_LOOPBACK

#define IPV4_ADDR_LOOPBACK   IPV4_ADDR_INIT(127, 0, 0, 1)

Static initializer for the loopback IPv4 address (127.0.0.1)

Definition at line 53 of file addr.h.

IPV4_ADDR_MAX_STR_LEN

#define IPV4_ADDR_MAX_STR_LEN   (sizeof("255.255.255.255"))

Maximum length of an IPv4 address as string.

Definition at line 36 of file addr.h.

Function Documentation

ipv4_addr_equal()

static bool ipv4_addr_equal ( const ipv4_addr_t * a, const ipv4_addr_t * b )

inlinestatic

Checks if two IPv4 addresses are equal.

Parameters

[in]	a	An IPv4 address.
[in]	b	Another IPv4 address.

Returns

true, if a and b are equal

false, otherwise.

Definition at line 72 of file addr.h.

ipv4_addr_from_buf()

ipv4_addr_t * ipv4_addr_from_buf	(	ipv4_addr_t *	result,
		const char *	addr,
		size_t	addr_len )

Converts an IPv4 address from a buffer of characters to a byte-represented IPv4 address.

Note

addr_len should be between 0 and IPV4_ADDR_MAX_STR_LEN

Parameters

[out]	result	The resulting byte representation
[in]	addr	An IPv4 address string representation
[in]	addr_len	The amount of characters to parse

Returns

result, on success

NULL, if addr was malformed

NULL, if result or addr was NULL

ipv4_addr_from_str()

ipv4_addr_t * ipv4_addr_from_str	(	ipv4_addr_t *	result,
		const char *	addr )

Converts an IPv4 address string representation to a byte-represented IPv4 address.

Parameters

[out]	result	The resulting byte representation
[in]	addr	An IPv4 address string representation

Returns

result, on success

NULL, if addr was malformed

NULL, if result or addr was NULL

ipv4_addr_is_multicast()

static bool ipv4_addr_is_multicast ( const ipv4_addr_t * addr )

inlinestatic

Check if addr is a multicast address.

See also

RFC 1112, section 4

Parameters

[in]

addr

An IPv4 address.

Returns

true, if addr is multicast address,

false, otherwise.

Definition at line 89 of file addr.h.

ipv4_addr_print()

void ipv4_addr_print

(

const ipv4_addr_t *

addr

)

Print IPv4 address to stdout.

Parameters

[in]

addr

Pointer to ipv4_addr_t to print

ipv4_addr_to_str()

char * ipv4_addr_to_str	(	char *	result,
		const ipv4_addr_t *	addr,
		uint8_t	result_len )

Converts an IPv4 address to its string representation.

Parameters

[out]	result	The resulting string representation of at least IPV4_ADDR_MAX_STR_LEN.
[in]	addr	An IPv4 address
[in]	result_len	Length of result

Returns

result, on success

NULL, if result_len was lesser than IPV4_ADDR_MAX_STR_LEN

NULL, if result or addr was NULL