text: /* SPDX-License-Identifier: BSD-2-Clause */
  /*
   * dhcpcd - DHCP client daemon
   * Copyright (c) 2006-2021 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
  