src/netboot.h

// Copyright 2016 Google Inc. All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files
// (the "Software"), to deal in the Software without restriction,
// including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software,
// and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#pragma once

#define NB_MAGIC	0xAA774217

#define NB_SERVER_PORT	33330
#define NB_ADVERT_PORT	33331

#define NB_COMMAND		1 // arg=0, data=command
#define NB_SEND_FILE		2 // arg=0, data=filename
#define NB_DATA			3 // arg=blocknum, data=data
#define NB_BOOT			4 // arg=0

#define NB_ACK			0

#define NB_ADVERTISE		0x77777777

#define NB_ERROR		0x80000000
#define NB_ERROR_BAD_CMD	0x80000001
#define NB_ERROR_BAD_PARAM	0x80000002
#define NB_ERROR_TOO_LARGE	0x80000003

typedef struct nbmsg_t {
	uint32_t magic;
	uint32_t cookie;
	uint32_t cmd;
	uint32_t arg;
	uint8_t  data[0];
} nbmsg;

int netboot_init(void *buf, size_t len);
int netboot_poll(void);