#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include "../utils/log.h"
#include "../utils/net.h"
#include "./dhcp_config_utils.h"

Include dependency graph for dhcp_config_utils.c:

Macros
#define	CAT(a, ...) PRIMITIVE_CAT(a, __VA_ARGS__)

#define	PRIMITIVE_CAT(a, ...) a##__VA_ARGS__

#define	DEC(x) PRIMITIVE_CAT(DEC_, x)

#define	DEC_0 0

#define	DEC_1 0

#define	DEC_2 1

#define	DEC_3 2

#define	DEC_4 3

#define	DEC_5 4

#define	DEC_6 5

#define	DEC_7 6

#define	DEC_8 7

#define	DEC_9 8

#define	DEC_10 9

#define	DEC_11 10

#define	DEC_12 11

#define	DEC_13 12

#define	DEC_14 13

#define	DEC_15 14

#define	DEC_16 15

#define	DEC_17 16

#define	DEC_18 17

#define	DEC_19 18

#define	DEC_20 19

#define	DEC_21 20

#define	DEC_22 21

#define	STR(x) #x

#define	XSTR(s) STR(s)

#define	SCANF_IPv4_STRING "%" XSTR(DEC(OS_INET_ADDRSTRLEN)) "[0123456789.]"

#define	SCANF_DHCP_LEASE_TIME_STRING "%" XSTR(DEC(DHCP_LEASE_TIME_SIZE)) "s"

Functions
bool	get_config_dhcpinfo (const char info, config_dhcpinfo_t el)
	Creates a `config_dhcpinfo_t` from a string. More...

Macro Definition Documentation

◆ CAT

#define CAT	(	a,
		...
	)	PRIMITIVE_CAT(a, __VA_ARGS__)

◆ DEC

#define DEC ( x ) PRIMITIVE_CAT(DEC_, x)

Decrements the given number using the forbidden magicks of the C preprocessor.

Currently only works for numbers up to 22, but you can add more defines for more numbers if you want.

Boost has a preprocessor library that can do this too, see https://www.boost.org/doc/libs/1_81_0/libs/preprocessor/doc/index.html.

Author: Paul Fultz II https://github.com/pfultz2/Cloak

Copyright: SPDX-FileCopyrightText: Copyright (c) 2015 Paul Fultz II SPDX-License-Identifier: BSL-1.0

Remarks: Adapted from https://github.com/pfultz2/Cloak/blob/master/cloak.h

◆ DEC_0

#define DEC_0 0

◆ DEC_1

#define DEC_1 0

◆ DEC_10

#define DEC_10 9

◆ DEC_11

#define DEC_11 10

◆ DEC_12

#define DEC_12 11

◆ DEC_13

#define DEC_13 12

◆ DEC_14

#define DEC_14 13

◆ DEC_15

#define DEC_15 14

◆ DEC_16

#define DEC_16 15

◆ DEC_17

#define DEC_17 16

◆ DEC_18

#define DEC_18 17

◆ DEC_19

#define DEC_19 18

◆ DEC_2

#define DEC_2 1

◆ DEC_20

#define DEC_20 19

◆ DEC_21

#define DEC_21 20

◆ DEC_22

#define DEC_22 21

◆ DEC_3

#define DEC_3 2

◆ DEC_4

#define DEC_4 3

◆ DEC_5

#define DEC_5 4

◆ DEC_6

#define DEC_6 5

◆ DEC_7

#define DEC_7 6

◆ DEC_8

#define DEC_8 7

◆ DEC_9

#define DEC_9 8

◆ PRIMITIVE_CAT

#define PRIMITIVE_CAT	(	a,
		...
	)	a##__VA_ARGS__

◆ SCANF_DHCP_LEASE_TIME_STRING

#define SCANF_DHCP_LEASE_TIME_STRING "%" XSTR(DEC(DHCP_LEASE_TIME_SIZE)) "s"

scanf() specifier to read a dnsmasq dhcp lease time (i.e. 24h)

◆ SCANF_IPv4_STRING

#define SCANF_IPv4_STRING "%" XSTR(DEC(OS_INET_ADDRSTRLEN)) "[0123456789.]"

scanf() specifier to read an IPv4 address in dot-separated decimal notation.

◆ STR

#define STR ( x ) #x

◆ XSTR

#define XSTR ( s ) STR(s)

Function Documentation

◆ get_config_dhcpinfo()

bool get_config_dhcpinfo	(	const char *	info,
		config_dhcpinfo_t *	el
	)

Creates a config_dhcpinfo_t from a string.

Parameters

[in] info - The string to parse. The format of this string is a comma-separated value line of: <vlanid>,<ip_addr_low>,<ip_addr_upp>,<subnet_mask>,<lease_time>

vlanid must be a decimal integer.

All other parameters are passed as a dhcp-range option to dnsmasq, see man dnsmasq(8).

For example: 0,10.0.0.2,10.0.0.254,255.255.255.0,24h.