pdns/dhcpmessage.hh

   1 #ifndef DHCPMESSAGE_HH
   2 #define DHCPMESSAGE_HH
   3
   4
   5 /*
   6  * Copyright 2006, 2007 Stefan Rompf <sux@loplof.de>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation
  11  */
  12
  13 #include <sys/types.h>
  14 #include <netinet/in.h>
  15 #include <string>
  16 extern "C" {
  17
  18 #define MAX_OPT_LEN 512 // RFC 2131 Minimumsize: 312 FIXME: add OPTION_MAXSIZE to use additional bytes
  19
  20
  21 // RFC 2132, 3.3
  22 #define BOOTP_OPTION_NETMASK            1
  23 // RFC 2132, 3.5
  24 #define BOOTP_OPTION_GATEWAY            3
  25 // RFC 2132, 3.8
  26 #define BOOTP_OPTION_DNS                6
  27 // RFC 2132, 3.14
  28 #define BOOTP_OPTION_HOSTNAME           12
  29 // RFC 2132, 3.15
  30 #define BOOTP_OPTION_BOOTFILE_SIZE      13
  31 // RFC 2132, 3.17
  32 #define BOOTP_OPTION_DOMAIN             15
  33 // RFC 2132, 5.3
  34 #define BOOTP_OPTION_BROADCAST          28
  35 // RFC 2132, 8.1
  36 #define BOOTP_OPTION_NISDOMAIN          40
  37
  38 // RFC 2132, 3.9
  39 #define DHCP_OPTION_LOGSRVS             7
  40 // RFC 2132, 3.11
  41 #define DHCP_OPTION_LPRSRVS             9
  42 // RFC 2132, 8.3
  43 #define DHCP_OPTION_NTPSRVS             42
  44 // RFC 2132, 8.9
  45 #define DHCP_OPTION_XFNTSRVS            48
  46 // RFC 2132, 8.10
  47 #define DHCP_OPTION_XDMSRVS             49
  48 // RFC 2132, 9.1
  49 #define DHCP_OPTION_REQADDR             50
  50 // RFC 2132, 9.2
  51 #define DHCP_OPTION_LEASE               51
  52 // RFC 2132, 9.3
  53 #define DHCP_OPTION_OVERLOAD            52
  54 // RFC 2132, 9.6
  55 #define DHCP_OPTION_TYPE                53
  56 // RFC 2132, 9.7
  57 #define DHCP_OPTION_SERVER              54
  58 // RFC 2132, 9.8
  59 #define DHCP_OPTION_OPTIONREQ           55
  60 // RFC 2132, 9.10
  61 #define DHCP_OPTION_PARAMREQ           56
  62
  63 #define DHCP_OPTION_MAXSIZE             57
  64 // RFC 2132, 9.11
  65 #define DHCP_OPTION_T1                  58
  66 // RFC 2132, 9.12
  67 #define DHCP_OPTION_T2                  59
  68 // RFC 2132, 9.13
  69 #define DHCP_OPTION_CLASS_IDENTIFIER    60
  70 // RFC 2132, 9.14
  71 #define DHCP_OPTION_CLIENT_IDENTIFIER   61
  72 // RFC 4039
  73 #define DHCP_OPTION_RAPID_COMMIT        80
  74
  75 #define BOOTP_CLIENT_PORT       68
  76 #define BOOTP_SERVER_PORT       67
  77
  78 #define BOOTP_OPCODE_REQUEST    1
  79 #define BOOTP_OPCODE_REPLY      2
  80
  81 #define NORESPONSE              -10
  82 #define DHCP_TYPE_DISCOVER      1
  83 #define DHCP_TYPE_OFFER         2
  84 #define DHCP_TYPE_REQUEST       3
  85 #define DHCP_TYPE_DECLINE       4
  86 #define DHCP_TYPE_ACK           5
  87 #define DHCP_TYPE_NAK           6
  88 #define DHCP_TYPE_RELEASE       7
  89 #define DHCP_TYPE_INFORM        8
  90
  91 typedef enum {
  92   DHCP_OVERLOAD_NONE,
  93   DHCP_OVERLOAD_FILE,
  94   DHCP_OVERLOAD_SNAME,
  95   DHCP_OVERLOAD_BOTH
  96 } dhcp_overload_opts;
  97
  98 struct dhcp_message {
  99   u_int8_t *pos, *last;
 100   dhcp_overload_opts overload, currentblock;
 101
 102   /* embedded DHCP message */
 103   u_int8_t op;
 104   u_int8_t htype;
 105   u_int8_t hlen;
 106   u_int8_t hops;
 107   u_int32_t xid;
 108   u_int16_t secs;
 109   u_int16_t flags;
 110   u_int32_t ciaddr;
 111   u_int32_t yiaddr;
 112   u_int32_t siaddr;
 113   u_int32_t giaddr;
 114   u_int8_t chaddr[16];
 115   u_int8_t sname[64];
 116   u_int8_t file[128];
 117   u_int8_t options[MAX_OPT_LEN];
 118 } __attribute__((packed)) ;
 119
 120
 121 void dm_init(struct dhcp_message *msg);
 122
 123 void dm_finish_options(struct dhcp_message *msg);
 124
 125 void dm_add_option(struct dhcp_message *msg, u_int8_t option,
 126                    u_int8_t length, void *opt);
 127
 128 u_int8_t *dm_next_option(struct dhcp_message *msg);
 129
 130
 131 int dm_parse_msg_raw(char *dframe, int plen,
 132                      struct in_addr *from_ip, struct dhcp_message *msg);
 133
 134 }
 135
 136 class DHCPCommunicator
 137 {
 138 public:
 139   DHCPCommunicator(const std::string& remote);
 140   std::string getMac(const std::string& ip);
 141 private:
 142   int d_socket;
 143 };
 144
 145 #endif
 146