1/* SPDX-License-Identifier: BSD-2-Clause */
2/*
3 * dhcpcd - DHCP client daemon
4 * Copyright (c) 2006-2023 Roy Marples <roy@marples.name>
5 * All rights reserved
6
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef CONTROL_H
30#define CONTROL_H
31
32#include <stdbool.h>
33
34#include "dhcpcd.h"
35
36#if !defined(CTL_FREE_LIST)
37#define	CTL_FREE_LIST 1
38#elif CTL_FREE_LIST == 0
39#undef	CTL_FREE_LIST
40#endif
41
42/* Limit queue size per fd */
43#define CONTROL_QUEUE_MAX	100
44
45struct fd_data {
46	TAILQ_ENTRY(fd_data) next;
47	void *data;
48	size_t data_size;
49	size_t data_len;
50	unsigned int data_flags;
51};
52TAILQ_HEAD(fd_data_head, fd_data);
53
54struct fd_list {
55	TAILQ_ENTRY(fd_list) next;
56	struct dhcpcd_ctx *ctx;
57	int fd;
58	unsigned int flags;
59	struct fd_data_head queue;
60#ifdef CTL_FREE_LIST
61	struct fd_data_head free_queue;
62#endif
63};
64TAILQ_HEAD(fd_list_head, fd_list);
65
66#define	FD_LISTEN	0x01U
67#define	FD_UNPRIV	0x02U
68#define	FD_SENDLEN	0x04U
69
70int control_start(struct dhcpcd_ctx *, const char *, sa_family_t);
71int control_stop(struct dhcpcd_ctx *);
72int control_open(const char *, sa_family_t, bool);
73ssize_t control_send(struct dhcpcd_ctx *, int, char * const *);
74struct fd_list *control_new(struct dhcpcd_ctx *, int, unsigned int);
75void control_free(struct fd_list *);
76void control_delete(struct fd_list *);
77int control_queue(struct fd_list *, void *, size_t);
78void control_recvdata(struct fd_list *fd, char *, size_t);
79#endif
80