dhcp-common.h

   1 /*
   2  * dhcpcd - DHCP client daemon
   3  * Copyright (c) 2006-2013 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
  38 /* Max MTU - defines dhcp option length */
  39 #define MTU_MAX             1500
  40 #define MTU_MIN             576
  41
  42 #define REQUEST         (1 << 0)
  43 #define UINT8           (1 << 1)
  44 #define UINT16          (1 << 2)
  45 #define SINT16          (1 << 3)
  46 #define UINT32          (1 << 4)
  47 #define SINT32          (1 << 5)
  48 #define ADDRIPV4        (1 << 6)
  49 #define STRING          (1 << 7)
  50 #define ARRAY           (1 << 8)
  51 #define RFC3361         (1 << 9)
  52 #define RFC3397         (1 << 10)
  53 #define RFC3442         (1 << 11)
  54 #define RFC5969         (1 << 12)
  55 #define ADDRIPV6        (1 << 13)
  56 #define BINHEX          (1 << 14)
  57 #define FLAG            (1 << 15)
  58 #define NOREQ           (1 << 16)
  59 #define EMBED           (1 << 17)
  60 #define ENCAP           (1 << 18)
  61 #define INDEX           (1 << 19)
  62 #define OPTION          (1 << 20)
  63
  64 struct dhcp_opt {
  65         uint32_t option; /* Also used for IANA Enterpise Number */
  66         int type;
  67         int len;
  68         char *var;
  69
  70         int index; /* Index counter for many instances of the same option */
  71
  72         /* Embedded options.
  73          * The option code is irrelevant here. */
  74         struct dhcp_opt *embopts;
  75         size_t embopts_len;
  76
  77         /* Encapsulated options */
  78         struct dhcp_opt *encopts;
  79         size_t encopts_len;
  80 };
  81
  82 /* DHCP Vendor-Identifying Vendor Options, RFC3925 */
  83 extern struct dhcp_opt *vivso;
  84 extern size_t vivso_len;
  85
  86 struct dhcp_opt *vivso_find(uint16_t, const void *);
  87
  88 size_t dhcp_vendor(char *, size_t);
  89
  90 #define add_option_mask(var, val) (var[val >> 3] |= 1 << (val & 7))
  91 #define del_option_mask(var, val) (var[val >> 3] &= ~(1 << (val & 7)))
  92 #define has_option_mask(var, val) (var[val >>3] & (1 << (val & 7)))
  93 int make_option_mask(const struct dhcp_opt *, size_t,
  94     uint8_t *, const char *, int);
  95
  96 size_t encode_rfc1035(const char *src, uint8_t *dst);
  97 ssize_t decode_rfc3397(char *, ssize_t, int, const uint8_t *);
  98 ssize_t print_string(char *, ssize_t, int, const uint8_t *);
  99 ssize_t print_option(char *, ssize_t, int, int, const uint8_t *, const char *);
 100
 101 ssize_t dhcp_envoption(char **, const char *, const char *, struct dhcp_opt *,
 102     const uint8_t *(*dgetopt)(unsigned int *, unsigned int *, unsigned int *,
 103     const uint8_t *, unsigned int, struct dhcp_opt **),
 104     const uint8_t *od, int ol);
 105 void dhcp_zero_index(struct dhcp_opt *);
 106
 107 #endif