| 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 |
| 140 | |
