net.c File Reference

File containing the implementation of the network utilities. More...

#include <stdbool.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <inttypes.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include "allocs.h"
#include "net.h"
#include "os.h"

Include dependency graph for net.c:

Functions
bool	validate_ipv4_string (const char *ip)
	Checks whether a string denotes a IPv4 address. More...
int	ip_2_nbo (const char *ip, const char *subnet_mask, in_addr_t *addr)
	IP string to struct in_addr_t converter. More...
int	ip4_2_buf (const char *ip, uint8_t buf[static IP_ALEN])
	IP string to buffer. More...
const char *	bit32_2_ip (uint32_t addr, char ip[static OS_INET_ADDRSTRLEN])
	Convert a 32 bit number IP to an IP string. More...
const char *	inaddr4_2_ip (const struct in_addr *addr, char ip[static OS_INET_ADDRSTRLEN])
	Convert the in_addr encoded IP4 address to an IP string. More...
const char *	inaddr6_2_ip (const struct in6_addr *addr, char ip[static OS_INET6_ADDRSTRLEN])
	Convert the in6_addr encoded IP6 address to an IP string. More...
uint8_t	get_short_subnet (const char *subnet_mask)
	Convert from a string subnet mask to a short integer version. More...
int	get_ip_host (const char *ip, const char *subnet_mask, uint32_t *host)
	Get the host identifier from an IP address string. More...
int	disable_pmtu_discovery (int sock)
	Disable the PMTU discovery for sockets. More...
int	edge_hwaddr_aton2 (const char *txt, uint8_t *addr)
	Convert ASCII string to MAC address (in any known format) More...

Detailed Description

File containing the implementation of the network utilities.

Author

Alexandru Mereacre

Date

2022

Copyright

SPDX-FileCopyrightText: © 2022 NQMCyber Ltd and edgesec contributors SPDX-License-Identifier: LGPL-3.0-or-later

Function Documentation

bit32_2_ip()

const char* bit32_2_ip	(	uint32_t	addr,
		char	ip[static OS_INET_ADDRSTRLEN]
	)

Convert a 32 bit number IP to an IP string.

Parameters

	addr	The IP in 32 bit format
[out]	ip	The output buffer to store the IP. Must be at least OS_INET_ADDRSTRLEN chars long.

Returns

Pointer to the returned IP (same as ip on success)

Return values

NULL	on error (see errno).

disable_pmtu_discovery()

int disable_pmtu_discovery

(

int

sock

)

Disable the PMTU discovery for sockets.

Parameters

[in]

sock

The socket descriptor

Returns

0 on success, -1 on failure

edge_hwaddr_aton2()

int edge_hwaddr_aton2	(	const char *	txt,
		uint8_t *	addr
	)

Convert ASCII string to MAC address (in any known format)

Authors

Jouni Malinen j@w1..nosp@m.fi and wpa_supplicant contributors

Date

2003-2019

Copyright

BSD

See also

https://w1.fi/wpa_supplicant/devel/common_8h.html#ab7ec8839c8e817e241c52ad7a0299be3

Parameters

[in]	txt	MAC address as a string (e.g., 00:11:22:33:44:55 or 0011.2233.4455)
[out]	addr	Buffer for the MAC address (ETHER_ADDR_LEN = 6 bytes)

Returns

int Characters used (> 0) on success, -1 on failure

get_ip_host()

int get_ip_host	(	const char *	ip,
		const char *	subnet_mask,
		uint32_t *	host
	)

Get the host identifier from an IP address string.

Parameters

	ip	The IP address string
	subnet_mask	The subnet mask string
[out]	host	The returned host indentifier

Returns

0 on success, -1 on failure

get_short_subnet()

uint8_t get_short_subnet

(

const char *

subnet_mask

)

Convert from a string subnet mask to a short integer version.

Parameters

subnet_mask

The subnet mask string

Returns

The short integer version subnet mask

inaddr4_2_ip()

const char* inaddr4_2_ip	(	const struct in_addr *	addr,
		char	ip[static OS_INET_ADDRSTRLEN]
	)

Convert the in_addr encoded IP4 address to an IP string.

Parameters

	addr	The in_addr encoded IP
[out]	ip	The output buffer to store the IP. Must be at least OS_INET_ADDRSTRLEN chars long.

Returns

Pointer to the returned IP (same as ip on success)

Return values

NULL	on error (see errno).

inaddr6_2_ip()

const char* inaddr6_2_ip	(	const struct in6_addr *	addr,
		char	ip[static OS_INET6_ADDRSTRLEN]
	)

Convert the in6_addr encoded IP6 address to an IP string.

Parameters

	addr	The in6_addr encoded IP
[out]	ip	The output buffer to store the IP. Must be at least OS_INET6_ADDRSTRLEN chars long.

Returns

Pointer to the returned IP (same as ip on success)

Return values

NULL	on error (see errno).

ip4_2_buf()

int ip4_2_buf	(	const char *	ip,
		uint8_t	buf[static IP_ALEN]
	)

IP string to buffer.

Parameters

	ip	The IP address string
[out]	buf	The output buffer of size IP_ALEN

Returns

0 on success, -1 on failure

ip_2_nbo()

int ip_2_nbo	(	const char *	ip,
		const char *	subnetMask,
		in_addr_t *	addr
	)

IP string to struct in_addr_t converter.

Parameters

	ip	The IP address string
	subnetMask	The IP address subnet mask
[out]	addr	The output struct in_addr_t value

Returns

0 on success, -1 on failure

validate_ipv4_string()

bool validate_ipv4_string

(

const char *

ip

)

Checks whether a string denotes a IPv4 address.

Parameters

ip	The IP in fromat x.y.z.q

Returns

true if the string is an IP, false otherwise