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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* dhcpcd - DHCP client daemon
* Copyright (c) 2006-2020 Roy Marples <roy@marples.name>
* All rights reserved
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef DHCPCOMMON_H
#define DHCPCOMMON_H
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdint.h>
#include <arpa/nameser.h> /* after normal includes for sunos */
#include "common.h"
#include "dhcpcd.h"
/* Support very old arpa/nameser.h as found in OpenBSD */
#ifndef NS_MAXDNAME
#define NS_MAXCDNAME MAXCDNAME
#define NS_MAXDNAME MAXDNAME
#define NS_MAXLABEL MAXLABEL
#endif
/* Max MTU - defines dhcp option length */
#define IP_UDP_SIZE 28
#define MTU_MAX 1500 - IP_UDP_SIZE
#define MTU_MIN 576 + IP_UDP_SIZE
#define OT_REQUEST (1 << 0)
#define OT_UINT8 (1 << 1)
#define OT_INT8 (1 << 2)
#define OT_UINT16 (1 << 3)
#define OT_INT16 (1 << 4)
#define OT_UINT32 (1 << 5)
#define OT_INT32 (1 << 6)
#define OT_ADDRIPV4 (1 << 7)
#define OT_STRING (1 << 8)
#define OT_ARRAY (1 << 9)
#define OT_RFC3361 (1 << 10)
#define OT_RFC1035 (1 << 11)
#define OT_RFC3442 (1 << 12)
#define OT_OPTIONAL (1 << 13)
#define OT_ADDRIPV6 (1 << 14)
#define OT_BINHEX (1 << 15)
#define OT_FLAG (1 << 16)
#define OT_NOREQ (1 << 17)
#define OT_EMBED (1 << 18)
#define OT_ENCAP (1 << 19)
#define OT_INDEX (1 << 20)
#define OT_OPTION (1 << 21)
#define OT_DOMAIN (1 << 22)
#define OT_ASCII (1 << 23)
#define OT_RAW (1 << 24)
#define OT_ESCSTRING (1 << 25)
#define OT_ESCFILE (1 << 26)
#define OT_BITFLAG (1 << 27)
#define OT_RESERVED (1 << 28)
#define DHC_REQ(r, n, o) \
(has_option_mask((r), (o)) && !has_option_mask((n), (o)))
#define DHC_REQOPT(o, r, n) \
(!((o)->type & OT_NOREQ) && \
((o)->type & OT_REQUEST || has_option_mask((r), (o)->option)) && \
!has_option_mask((n), (o)->option))
struct dhcp_opt {
uint32_t option; /* Also used for IANA Enterpise Number */
int type;
size_t len;
char *var;
int index; /* Index counter for many instances of the same option */
char bitflags[8];
/* Embedded options.
* The option code is irrelevant here. */
struct dhcp_opt *embopts;
size_t embopts_len;
/* Encapsulated options */
struct dhcp_opt *encopts;
size_t encopts_len;
};
const char *dhcp_get_hostname(char *, size_t, const struct if_options *);
struct dhcp_opt *vivso_find(uint32_t, const void *);
ssize_t dhcp_vendor(char *, size_t);
void dhcp_print_option_encoding(const struct dhcp_opt *opt, int cols);
#define add_option_mask(var, val) \
((var)[(val) >> 3] = (uint8_t)((var)[(val) >> 3] | 1 << ((val) & 7)))
#define del_option_mask(var, val) \
((var)[(val) >> 3] = (uint8_t)((var)[(val) >> 3] & ~(1 << ((val) & 7))))
#define has_option_mask(var, val) \
((var)[(val) >> 3] & (uint8_t)(1 << ((val) & 7)))
int make_option_mask(const struct dhcp_opt *, size_t,
const struct dhcp_opt *, size_t,
uint8_t *, const char *, int);
size_t encode_rfc1035(const char *src, uint8_t *dst);
ssize_t decode_rfc1035(char *, size_t, const uint8_t *, size_t);
ssize_t print_string(char *, size_t, int, const uint8_t *, size_t);
int dhcp_set_leasefile(char *, size_t, int, const struct interface *);
void dhcp_envoption(struct dhcpcd_ctx *,
FILE *, const char *, const char *, struct dhcp_opt *,
const uint8_t *(*dgetopt)(struct dhcpcd_ctx *,
size_t *, unsigned int *, size_t *,
const uint8_t *, size_t, struct dhcp_opt **),
const uint8_t *od, size_t ol);
void dhcp_zero_index(struct dhcp_opt *);
ssize_t dhcp_readfile(struct dhcpcd_ctx *, const char *, void *, size_t);
ssize_t dhcp_writefile(struct dhcpcd_ctx *, const char *, mode_t,
const void *, size_t);
int dhcp_filemtime(struct dhcpcd_ctx *, const char *, time_t *);
int dhcp_unlink(struct dhcpcd_ctx *, const char *);
size_t dhcp_read_hwaddr_aton(struct dhcpcd_ctx *, uint8_t **, const char *);
#endif
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