package/ead/src/ead.h

   1 /*
   2  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2
   6  * as published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #ifndef __EAD_H
  15 #define __EAD_H
  16
  17 #define EAD_DEBUGLEVEL  1
  18
  19 #include <stdint.h>
  20 #include <stddef.h>
  21
  22 #ifndef MAXSALTLEN
  23 #define MAXSALTLEN 32
  24 #endif
  25
  26 #define EAD_PORT        56026UL
  27 #define EAD_MAGIC       3671771902UL
  28 #define EAD_CMD_TIMEOUT 10
  29
  30 #define EAD_MAX_IV_INCR 128
  31
  32 /* request/response types */
  33 /* response id == request id + 1 */
  34 enum ead_type {
  35         EAD_TYPE_PING,
  36         EAD_TYPE_PONG,
  37
  38         EAD_TYPE_SET_USERNAME,
  39         EAD_TYPE_ACK_USERNAME,
  40
  41         EAD_TYPE_GET_PRIME,
  42         EAD_TYPE_PRIME,
  43
  44         EAD_TYPE_SEND_A,
  45         EAD_TYPE_SEND_B,
  46
  47         EAD_TYPE_SEND_AUTH,
  48         EAD_TYPE_DONE_AUTH,
  49
  50         EAD_TYPE_SEND_CMD,
  51         EAD_TYPE_RESULT_CMD,
  52
  53         EAD_TYPE_LAST
  54 };
  55
  56 enum ead_auth_type {
  57         EAD_AUTH_DEFAULT,
  58         EAD_AUTH_MD5
  59 };
  60
  61 enum ead_cmd_type {
  62         EAD_CMD_NORMAL,
  63         EAD_CMD_BACKGROUND,
  64         EAD_CMD_LAST
  65 };
  66
  67 struct ead_msg_pong {
  68         uint16_t auth_type;
  69         char name[];
  70 } __attribute__((packed));
  71
  72 struct ead_msg_number {
  73         uint8_t id;
  74         unsigned char data[];
  75 } __attribute__((packed));
  76
  77 struct ead_msg_salt {
  78         uint8_t prime;
  79         uint8_t len;
  80         unsigned char salt[MAXSALTLEN];
  81         unsigned char ext_salt[MAXSALTLEN];
  82 } __attribute__((packed));
  83
  84 struct ead_msg_user {
  85         char username[32];
  86 } __attribute__((packed));
  87
  88 struct ead_msg_auth {
  89         unsigned char data[20];
  90 } __attribute__((packed));
  91
  92 struct ead_msg_cmd {
  93         uint8_t type;
  94         uint16_t timeout;
  95         unsigned char data[];
  96 } __attribute__((packed));
  97
  98 struct ead_msg_cmd_data {
  99         uint8_t done;
 100         unsigned char data[];
 101 } __attribute__((packed));
 102
 103 struct ead_msg_encrypted {
 104         uint32_t hash[5];
 105         uint32_t iv;
 106         uint8_t pad;
 107         union {
 108                 struct ead_msg_cmd cmd;
 109                 struct ead_msg_cmd_data cmd_data;
 110         } data[];
 111 } __attribute__((packed));
 112
 113
 114 #define EAD_DATA(_msg, _type) (&((_msg)->data[0]._type))
 115 #define EAD_ENC_DATA(_msg, _type) (&((_msg)->data[0].enc.data[0]._type))
 116
 117 /* for ead_msg::sid */
 118 #define EAD_INSTANCE_MASK       0xf000
 119 #define EAD_INSTANCE_SHIFT      12
 120
 121 struct ead_msg {
 122         uint32_t magic;
 123         uint32_t len;
 124         uint32_t type;
 125         uint16_t nid; /* node id */
 126         uint16_t sid; /* session id */
 127         uint32_t ip; /* source ip for responses from the server */
 128         union {
 129                 struct ead_msg_pong pong;
 130                 struct ead_msg_user user;
 131                 struct ead_msg_number number;
 132                 struct ead_msg_auth auth;
 133                 struct ead_msg_salt salt;
 134                 struct ead_msg_encrypted enc;
 135         } data[];
 136 } __attribute__((packed));
 137
 138
 139 #endif