1/*
2 * dhcpcd - DHCP client daemon
3 * Copyright (c) 2006-2019 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 IP_UDP_SIZE 28
41#define MTU_MAX 1500 - IP_UDP_SIZE
42#define MTU_MIN 576 + IP_UDP_SIZE
43
44#define OT_REQUEST (1 << 0)
45#define OT_UINT8 (1 << 1)
46#define OT_INT8 (1 << 2)
47#define OT_UINT16 (1 << 3)
48#define OT_INT16 (1 << 4)
49#define OT_UINT32 (1 << 5)
50#define OT_INT32 (1 << 6)
51#define OT_ADDRIPV4 (1 << 7)
52#define OT_STRING (1 << 8)
53#define OT_ARRAY (1 << 9)
54#define OT_RFC3361 (1 << 10)
55#define OT_RFC1035 (1 << 11)
56#define OT_RFC3442 (1 << 12)
57#define OT_OPTIONAL (1 << 13)
58#define OT_ADDRIPV6 (1 << 14)
59#define OT_BINHEX (1 << 15)
60#define OT_FLAG (1 << 16)
61#define OT_NOREQ (1 << 17)
62#define OT_EMBED (1 << 18)
63#define OT_ENCAP (1 << 19)
64#define OT_INDEX (1 << 20)
65#define OT_OPTION (1 << 21)
66#define OT_DOMAIN (1 << 22)
67#define OT_ASCII (1 << 23)
68#define OT_RAW (1 << 24)
69#define OT_ESCSTRING (1 << 25)
70#define OT_ESCFILE (1 << 26)
71#define OT_BITFLAG (1 << 27)
72#define OT_RESERVED (1 << 28)
73
74struct dhcp_opt {
75 uint32_t option; /* Also used for IANA Enterpise Number */
76 int type;
77 size_t len;
78 char *var;
79
80 int index; /* Index counter for many instances of the same option */
81 char bitflags[8];
82
83 /* Embedded options.
84 * The option code is irrelevant here. */
85 struct dhcp_opt *embopts;
86 size_t embopts_len;
87
88 /* Encapsulated options */
89 struct dhcp_opt *encopts;
90 size_t encopts_len;
91};
92
93const char *dhcp_get_hostname(char *, size_t, const struct if_options *);
94struct dhcp_opt *vivso_find(uint32_t, const void *);
95
96ssize_t dhcp_vendor(char *, size_t);
97
98void dhcp_print_option_encoding(const struct dhcp_opt *opt, int cols);
99#define add_option_mask(var, val) \
100 ((var)[(val) >> 3] = (uint8_t)((var)[(val) >> 3] | 1 << ((val) & 7)))
101#define del_option_mask(var, val) \
102 ((var)[(val) >> 3] = (uint8_t)((var)[(val) >> 3] & ~(1 << ((val) & 7))))
103#define has_option_mask(var, val) \
104 ((var)[(val) >> 3] & (uint8_t)(1 << ((val) & 7)))
105int make_option_mask(const struct dhcp_opt *, size_t,
106 const struct dhcp_opt *, size_t,
107 uint8_t *, const char *, int);
108
109size_t encode_rfc1035(const char *src, uint8_t *dst);
110ssize_t decode_rfc1035(char *, size_t, const uint8_t *, size_t);
111ssize_t print_string(char *, size_t, int, const uint8_t *, size_t);
112int dhcp_set_leasefile(char *, size_t, int, const struct interface *);
113
114size_t dhcp_envoption(struct dhcpcd_ctx *,
115 char **, const char *, const char *, struct dhcp_opt *,
116 const uint8_t *(*dgetopt)(struct dhcpcd_ctx *,
117 size_t *, unsigned int *, size_t *,
118 const uint8_t *, size_t, struct dhcp_opt **),
119 const uint8_t *od, size_t ol);
120void dhcp_zero_index(struct dhcp_opt *);
121size_t dhcp_read_lease_fd(int, void **);
122
123#endif
124