treewide: fix replace nbd@openwrt.org with nbd@nbd.name
[openwrt.org/openwrt.git] / package / network / services / ead / src / ead.h
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/*
 * Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
 *
 * 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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