1/*
2 * dhcpcd - DHCP client daemon
3 * Copyright (c) 2006-2015 Roy Marples <roy@marples.name>
4 * All rights reserved
5
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#ifndef DHCPCOMMON_H
29#define DHCPCOMMON_H
30
31#include <arpa/inet.h>
32#include <netinet/in.h>
33
34#include <stdint.h>
35
36#include "common.h"
37#include "dhcpcd.h"
38
39/* Max MTU - defines dhcp option length */
40#define MTU_MAX             1500
41#define MTU_MIN             576
42
43#define REQUEST		(1 << 0)
44#define UINT8		(1 << 1)
45#define UINT16		(1 << 2)
46#define SINT16		(1 << 3)
47#define UINT32		(1 << 4)
48#define SINT32		(1 << 5)
49#define ADDRIPV4	(1 << 6)
50#define STRING		(1 << 7)
51#define ARRAY		(1 << 8)
52#define RFC3361		(1 << 9)
53#define RFC3397		(1 << 10)
54#define RFC3442		(1 << 11)
55#define RFC5969		(1 << 12)
56#define ADDRIPV6	(1 << 13)
57#define BINHEX		(1 << 14)
58#define FLAG		(1 << 15)
59#define NOREQ		(1 << 16)
60#define EMBED		(1 << 17)
61#define ENCAP		(1 << 18)
62#define INDEX		(1 << 19)
63#define OPTION		(1 << 20)
64#define DOMAIN		(1 << 21)
65#define ASCII		(1 << 22)
66#define RAW		(1 << 23)
67#define ESCSTRING	(1 << 24)
68#define ESCFILE		(1 << 25)
69#define BITFLAG		(1 << 26)
70
71struct dhcp_opt {
72	uint32_t option; /* Also used for IANA Enterpise Number */
73	int type;
74	size_t len;
75	char *var;
76
77	int index; /* Index counter for many instances of the same option */
78
79	/* Embedded options.
80	 * The option code is irrelevant here. */
81	struct dhcp_opt *embopts;
82	size_t embopts_len;
83
84	/* Encapsulated options */
85	struct dhcp_opt *encopts;
86	size_t encopts_len;
87};
88
89struct dhcp_opt *vivso_find(uint32_t, const void *);
90
91ssize_t dhcp_vendor(char *, size_t);
92
93void dhcp_print_option_encoding(const struct dhcp_opt *opt, int cols);
94#define add_option_mask(var, val) \
95	((var)[(val) >> 3] = (uint8_t)((var)[(val) >> 3] | 1 << ((val) & 7)))
96#define del_option_mask(var, val) \
97	((var)[(val) >> 3] = (uint8_t)((var)[(val) >> 3] & ~(1 << ((val) & 7))))
98#define has_option_mask(var, val) \
99	((var)[(val) >> 3] & (uint8_t)(1 << ((val) & 7)))
100int make_option_mask(const struct dhcp_opt *, size_t,
101    const struct dhcp_opt *, size_t,
102    uint8_t *, const char *, int);
103
104size_t encode_rfc1035(const char *src, uint8_t *dst);
105ssize_t decode_rfc3397(char *, size_t, const uint8_t *, size_t);
106ssize_t print_string(char *, size_t, int, const uint8_t *, size_t);
107ssize_t print_option(char *, size_t, int, const uint8_t *, size_t,
108    const char *);
109int dhcp_set_leasefile(char *, size_t, int,
110    const struct interface *, const char *);
111
112size_t dhcp_envoption(struct dhcpcd_ctx *,
113    char **, const char *, const char *, struct dhcp_opt *,
114    const uint8_t *(*dgetopt)(struct dhcpcd_ctx *,
115    size_t *, unsigned int *, size_t *,
116    const uint8_t *, size_t, struct dhcp_opt **),
117    const uint8_t *od, size_t ol);
118void dhcp_zero_index(struct dhcp_opt *);
119
120#endif
121