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/*
* Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __EAD_H
#define __EAD_H
#define EAD_DEBUGLEVEL 1
#include <stdint.h>
#include <stddef.h>
#ifndef MAXSALTLEN
#define MAXSALTLEN 32
#endif
#define EAD_PORT 56026UL
#define EAD_MAGIC 3671771902UL
#define EAD_CMD_TIMEOUT 10
#define EAD_MAX_IV_INCR 128
/* request/response types */
/* response id == request id + 1 */
enum ead_type {
EAD_TYPE_PING,
EAD_TYPE_PONG,
EAD_TYPE_SET_USERNAME,
EAD_TYPE_ACK_USERNAME,
EAD_TYPE_GET_PRIME,
EAD_TYPE_PRIME,
EAD_TYPE_SEND_A,
EAD_TYPE_SEND_B,
EAD_TYPE_SEND_AUTH,
EAD_TYPE_DONE_AUTH,
EAD_TYPE_SEND_CMD,
EAD_TYPE_RESULT_CMD,
EAD_TYPE_LAST
};
enum ead_auth_type {
EAD_AUTH_DEFAULT,
EAD_AUTH_MD5
};
enum ead_cmd_type {
EAD_CMD_NORMAL,
EAD_CMD_BACKGROUND,
EAD_CMD_LAST
};
struct ead_msg_pong {
uint16_t auth_type;
char name[];
} __attribute__((packed));
struct ead_msg_number {
uint8_t id;
unsigned char data[];
} __attribute__((packed));
struct ead_msg_salt {
uint8_t prime;
uint8_t len;
unsigned char salt[MAXSALTLEN];
unsigned char ext_salt[MAXSALTLEN];
} __attribute__((packed));
struct ead_msg_user {
char username[32];
} __attribute__((packed));
struct ead_msg_auth {
unsigned char data[20];
} __attribute__((packed));
struct ead_msg_cmd {
uint8_t type;
uint16_t timeout;
unsigned char data[];
} __attribute__((packed));
struct ead_msg_cmd_data {
uint8_t done;
unsigned char data[];
} __attribute__((packed));
struct ead_msg_encrypted {
uint32_t hash[5];
uint32_t iv;
uint8_t pad;
union {
struct ead_msg_cmd cmd;
struct ead_msg_cmd_data cmd_data;
} data[];
} __attribute__((packed));
#define EAD_DATA(_msg, _type) (&((_msg)->data[0]._type))
#define EAD_ENC_DATA(_msg, _type) (&((_msg)->data[0].enc.data[0]._type))
/* for ead_msg::sid */
#define EAD_INSTANCE_MASK 0xf000
#define EAD_INSTANCE_SHIFT 12
struct ead_msg {
uint32_t magic;
uint32_t len;
uint32_t type;
uint16_t nid; /* node id */
uint16_t sid; /* session id */
uint32_t ip; /* source ip for responses from the server */
union {
struct ead_msg_pong pong;
struct ead_msg_user user;
struct ead_msg_number number;
struct ead_msg_auth auth;
struct ead_msg_salt salt;
struct ead_msg_encrypted enc;
} data[];
} __attribute__((packed));
#endif
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