/*************************************************************************
* (C) 2010 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: blob.c,v 1.4.4.3 2012/03/15 00:44:23 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
	by Michael Pounov <misho@elwix.org>.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include "global.h"


/*
 * rpc_srv_blobCreate() - Create map blob to memory region and return object
 *
 * @srv = RPC Server instance
 * @len = BLOB length object
 * return: NULL error or !=NULL allocated BLOB object
 */
inline rpc_blob_t *
rpc_srv_blobCreate(rpc_srv_t * __restrict srv, int len)
{
	rpc_blob_t *blob = NULL;
	char szFName[MAXPATHLEN];
	int f;
	u_int rnd;

#ifdef HAVE_SRANDOMDEV
	srandomdev();
#else
	time_t tim;

	srandom((time(&tim) ^ getpid()));
#endif
again:
	rnd = random() % UINT_MAX;

	memset(szFName, 0, sizeof szFName);
	snprintf(szFName, sizeof szFName, BLOB_FILE, AIT_GET_STR(&srv->srv_blob.dir), rnd);
	f = open(szFName, O_CREAT | O_EXCL | O_RDWR, 0600);
	if (f == -1) {
		if (errno == EEXIST)
			goto again;

		LOGERR;
		return NULL;
	}
	if (lseek(f, len - 1, SEEK_SET) == -1) {
		LOGERR;
		close(f);
		unlink(szFName);
		return NULL;
	} else
		write(f, "", 1);

	blob = malloc(sizeof(rpc_blob_t));
	if (!blob) {
		LOGERR;
		close(f);
		unlink(szFName);
		return NULL;
	}

	blob->blob_data = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, f, 0);
	if (blob->blob_data == MAP_FAILED) {
		LOGERR;
		free(blob);
		close(f);
		unlink(szFName);
		return NULL;
	} else
		close(f);

	blob->blob_len = len;
	blob->blob_var = rnd;
	return blob;
}

/*
 * rpc_srv_blobMap() - Map blob to memory region 
 *
 * @srv = RPC Server instance
 * @blob = Map to this BLOB element
 * return: -1 error or 0 ok
 */
inline int
rpc_srv_blobMap(rpc_srv_t * __restrict srv, rpc_blob_t * __restrict blob)
{
	int f;
	char szFName[MAXPATHLEN];

	if (!blob) {
		rpc_SetErr(EINVAL, "Invalid argument BLOB");
		return -1;
	}
	if (blob->blob_data) {
		rpc_SetErr(EPERM, "Already mmapped object found!");
		return -1;
	}

	memset(szFName, 0, sizeof szFName);
	snprintf(szFName, sizeof szFName, BLOB_FILE, AIT_GET_STR(&srv->srv_blob.dir), blob->blob_var);
	f = open(szFName, O_RDWR);
	if (f == -1) {
		LOGERR;
		return -1;
	}

	blob->blob_data = mmap(NULL, blob->blob_len, PROT_READ | PROT_WRITE, MAP_SHARED, f, 0);
	if (blob->blob_data == MAP_FAILED) {
		LOGERR;
		close(f);
		blob->blob_data = NULL;
		return -1;
	} else {
		close(f);

		madvise(blob->blob_data, blob->blob_len, MADV_SEQUENTIAL);
	}

	return 0;
}

/*
 * rpc_srv_blobUnmap() - Unmap blob memory region 
 *
 * @blob = Mapped BLOB element
 * return: none
 */
inline void
rpc_srv_blobUnmap(rpc_blob_t * __restrict blob)
{
	if (!blob || !blob->blob_data)
		rpc_SetErr(EINVAL, "Invalid arguments");
	else {
		munmap(blob->blob_data, blob->blob_len);
		blob->blob_data = NULL;
	}
}

/*
 * rpc_srv_blobFree() - Free blob from disk & memory
 *
 * @srv = RPC Server instance
 * @blob = Mapped BLOB element
 * return: -1 error or 0 ok
 */
inline int
rpc_srv_blobFree(rpc_srv_t * __restrict srv, rpc_blob_t * __restrict blob)
{
	char szFName[MAXPATHLEN];

	if (!blob) {
		rpc_SetErr(EINVAL, "Invalid argument BLOB");
		return -1;
	}

	if (blob->blob_data)
		rpc_srv_blobUnmap(blob);

	memset(szFName, 0, sizeof szFName);
	snprintf(szFName, sizeof szFName, BLOB_FILE, AIT_GET_STR(&srv->srv_blob.dir), blob->blob_var);
	if (unlink(szFName) == -1) {
		LOGERR;
		return -1;
	}

	return 0;
}

// ------------------------------------------------------------

/*
 * rpc_srv_sendBLOB() - Send mapped BLOB to client
 *
 * @cli = Client instance
 * @blob = Mapped BLOB element
 * return: -1 error, 0 ok
 */
int
rpc_srv_sendBLOB(rpc_cli_t * __restrict cli, rpc_blob_t * __restrict blob)
{
	int ret, len;
	uint8_t *pos;

	if (!cli || !blob || !blob->blob_data) {
		rpc_SetErr(EINVAL, "Invalid arguments");
		return -1;
	}

	for (ret = blob->blob_len, pos = blob->blob_data; ret > 0; ret -= len, pos += len) {
		len = send(cli->cli_sock, pos, ret, 0);
		if (len == -1) {
			LOGERR;
			return -1;
		}
	}

	return ret;
}

/*
 * rpc_srv_recvBLOB() - Receive BLOB from client
 *
 * @cli = Client instance
 * @blob = Mapped BLOB element
 * return: -1 error, 0 ok, >0 unreceived data from client, may be error?
 */
int
rpc_srv_recvBLOB(rpc_cli_t * __restrict cli, rpc_blob_t * __restrict blob)
{
	int ret, len;
	uint8_t *pos;
	fd_set fds;
	struct timeval tv = { DEF_RPC_TIMEOUT, 0 };

	if (!cli || !blob || !blob->blob_data) {
		rpc_SetErr(EINVAL, "Invalid arguments");
		return -1;
	} else
		tv.tv_sec = ((rpc_sess_t*) cli->cli_parent)->sess_timeout;

	for (ret = blob->blob_len, pos = blob->blob_data; ret > 0; ret -= len, pos += len) {
		FD_ZERO(&fds);
		FD_SET(cli->cli_sock, &fds);
		len = select(cli->cli_sock + 1, &fds, NULL, NULL, &tv);
		if (len < 1) {
			LOGERR;
			return -1;
		}

		len = recv(cli->cli_sock, pos, ret, 0);
		if (len == -1) {
			LOGERR;
			return -1;
		}
	}

	return ret;
}

// ------------------------------------------------------------

/*
 * rpc_cli_sendBLOB() - Send BLOB to server
 *
 * @cli = Client instance
 * @var = BLOB variable
 * @data = BLOB data
 * return: -1 error, 0 ok, 1 remote error
 */
int
rpc_cli_sendBLOB(rpc_cli_t * __restrict cli, ait_val_t * __restrict var, void * __restrict data)
{
	int ret, len;
	uint8_t *pos;
	struct tagBLOBHdr hdr;
	fd_set fds;
	struct timeval tv = { DEF_RPC_TIMEOUT, 0 };

	if (!cli || !var || !data) {
		rpc_SetErr(EINVAL, "Invalid arguments");
		return -1;
	} else
		tv.tv_sec = ((rpc_sess_t*) cli->cli_parent)->sess_timeout;

	rpc_addPktSession(&hdr.hdr_session, cli->cli_parent);
	hdr.hdr_cmd = set;
	hdr.hdr_var = 0;
	hdr.hdr_ret = 0;
	hdr.hdr_len = htonl(AIT_LEN(var));
	/* calculate CRC */
	hdr.hdr_crc ^= hdr.hdr_crc;
	hdr.hdr_crc = htons(crcFletcher16((u_short*) &hdr, io_align(sizeof hdr, 1) / 2));

	/* send SET request */
	if (send(cli->cli_sock, &hdr, sizeof hdr, 0) == -1) {
		LOGERR;
		return -1;
	}

	/* send BLOB to server */
	for (ret = AIT_LEN(var), pos = data; ret > 0; ret -= len, pos += len)
		if ((len = send(cli->cli_sock, pos, ret, 0)) == -1) {
			LOGERR;
			return -1;
		}

	/* wait for reply */
	FD_ZERO(&fds);
	FD_SET(cli->cli_sock, &fds);
	switch (select(cli->cli_sock + 1, &fds, NULL, NULL, &tv)) {
		case -1:
			LOGERR;
			return 1;
		case 0:
			rpc_SetErr(ETIMEDOUT, "Timeout reached! Server not responde");
			return 1;
	}
	if (recv(cli->cli_sock, &hdr, sizeof hdr, 0) == -1) {
		LOGERR;
		return 1;
	}
	/* check CRC */
	ret = ntohs(hdr.hdr_crc);
	hdr.hdr_crc ^= hdr.hdr_crc;
	if (ret != crcFletcher16((u_short*) &hdr, io_align(sizeof hdr, 1) / 2)) {
		rpc_SetErr(ERPCMISMATCH, "Bad CRC BLOB packet");
		return 1;
	}

	if (hdr.hdr_cmd != error) {
		if (ntohl(hdr.hdr_len) != AIT_LEN(var)) {
			rpc_SetErr(ECANCELED, "Bad return length packet");
			return 1;
		}

		var->val.blob = ntohl(hdr.hdr_var);
	}

	return hdr.hdr_cmd == error;
}

/*
 * rpc_cli_recvBLOB() - Receive BLOB from server
 *
 * @cli = Client instance
 * @var = BLOB variable
 * @data = BLOB data, must be free after use!
 * return: -1 error, 0 ok, 1 remote error
 */
int
rpc_cli_recvBLOB(rpc_cli_t * __restrict cli, ait_val_t * __restrict var, void ** __restrict data)
{
	int ret, len;
	uint8_t *pos;
	fd_set fds;
	struct timeval tv = { DEF_RPC_TIMEOUT, 0 };
	struct tagBLOBHdr hdr;

	if (!cli || !var || !data) {
		rpc_SetErr(EINVAL, "Invalid arguments");
		return -1;
	} else
		tv.tv_sec = ((rpc_sess_t*) cli->cli_parent)->sess_timeout;

	*data = malloc(AIT_LEN(var));
	if (!*data) {
		LOGERR;
		return -1;
	} else
		memset(*data, 0, AIT_LEN(var));

	rpc_addPktSession(&hdr.hdr_session, cli->cli_parent);
	hdr.hdr_cmd = get;
	hdr.hdr_var = htonl((uint32_t) AIT_GET_BLOB(var));
	hdr.hdr_ret = 0;
	hdr.hdr_len = 0;
	/* calculate CRC */
	hdr.hdr_crc ^= hdr.hdr_crc;
	hdr.hdr_crc = htons(crcFletcher16((u_short*) &hdr, io_align(sizeof hdr, 1) / 2));

	/* send GET request */
	if (send(cli->cli_sock, &hdr, sizeof hdr, 0) == -1) {
		LOGERR;
		free(*data);
		*data = NULL;
		return -1;
	}

	/* receive BLOB from server */
	for (ret = AIT_LEN(var), pos = *data; ret > 0; ret -= len, pos += len) {
		FD_ZERO(&fds);
		FD_SET(cli->cli_sock, &fds);
		len = select(cli->cli_sock + 1, &fds, NULL, NULL, &tv);
		if (len < 1) {
			LOGERR;
			free(*data);
			*data = NULL;
			return -1;
		}

		if ((len = recv(cli->cli_sock, pos, ret, 0)) == -1) {
			LOGERR;
			free(*data);
			*data = NULL;
			return -1;
		}
	}

	/* wait for reply */
	FD_ZERO(&fds);
	FD_SET(cli->cli_sock, &fds);
	switch (select(cli->cli_sock + 1, &fds, NULL, NULL, &tv)) {
		case -1:
			LOGERR;
			free(*data);
			*data = NULL;
			return 1;
		case 0:
			rpc_SetErr(ETIMEDOUT, "Timeout reached! Server not responde");
			free(*data);
			*data = NULL;
			return 1;
	}
	if (recv(cli->cli_sock, &hdr, sizeof hdr, 0) == -1) {
		LOGERR;
		free(*data);
		*data = NULL;
		return 1;
	}
	/* check CRC */
	ret = ntohs(hdr.hdr_crc);
	hdr.hdr_crc ^= hdr.hdr_crc;
	if (ret != crcFletcher16((u_short*) &hdr, io_align(sizeof hdr, 1) / 2)) {
		rpc_SetErr(ERPCMISMATCH, "Bad CRC BLOB packet");
		free(*data);
		*data = NULL;
		return 1;
	}
	if (hdr.hdr_cmd != error) {
		if (ntohl(hdr.hdr_len) != AIT_LEN(var)) {
			rpc_SetErr(ECANCELED, "Bad return length packet");
			free(*data);
			*data = NULL;
			return 1;
		}
	}

	return hdr.hdr_cmd == error;
}

/*
 * rpc_cli_delBLOB() - Delete BLOB from server
 *
 * @cli = Client instance
 * @var = BLOB variable
 * return: -1 error, 0 ok, 1 remote error
 */
int
rpc_cli_delBLOB(rpc_cli_t * __restrict cli, ait_val_t * __restrict var)
{
	struct tagBLOBHdr hdr;
	fd_set fds;
	struct timeval tv = { DEF_RPC_TIMEOUT, 0 };
	int ret;

	if (!cli || !var) {
		rpc_SetErr(EINVAL, "Invalid arguments");
		return -1;
	} else
		tv.tv_sec = ((rpc_sess_t*) cli->cli_parent)->sess_timeout;

	rpc_addPktSession(&hdr.hdr_session, cli->cli_parent);
	hdr.hdr_cmd = unset;
	hdr.hdr_var = htonl((uint32_t) AIT_GET_BLOB(var));
	hdr.hdr_ret = 0;
	hdr.hdr_len = 0;
	/* calculate CRC */
	hdr.hdr_crc ^= hdr.hdr_crc;
	hdr.hdr_crc = htons(crcFletcher16((u_short*) &hdr, io_align(sizeof hdr, 1) / 2));

	/* send UNSET request */
	if (send(cli->cli_sock, &hdr, sizeof hdr, 0) == -1) {
		LOGERR;
		return -1;
	}

	/* wait for reply */
	FD_ZERO(&fds);
	FD_SET(cli->cli_sock, &fds);
	switch (select(cli->cli_sock + 1, &fds, NULL, NULL, &tv)) {
		case -1:
			LOGERR;
			return 1;
		case 0:
			rpc_SetErr(ETIMEDOUT, "Timeout reached! Server not responde");
			return 1;
	}
	if (recv(cli->cli_sock, &hdr, sizeof hdr, 0) == -1) {
		LOGERR;
		return 1;
	}
	/* check CRC */
	ret = ntohs(hdr.hdr_crc);
	hdr.hdr_crc ^= hdr.hdr_crc;
	if (ret != crcFletcher16((u_short*) &hdr, io_align(sizeof hdr, 1) / 2)) {
		rpc_SetErr(ERPCMISMATCH, "Bad CRC BLOB packet");
		return 1;
	}

	return hdr.hdr_cmd == error;
}

/*
 * rpc_cli_getBLOB() - Receive BLOB from server and Delete after that
 *
 * @cli = Client instance
 * @var = BLOB variable
 * @data = BLOB data, must be free after use!
 * return: -1 error, 0 ok, 1 remote error
 */
inline int
rpc_cli_getBLOB(rpc_cli_t * __restrict cli, ait_val_t * __restrict var, void ** __restrict data)
{
	int ret;

	ret = rpc_cli_recvBLOB(cli, var, data);
	ret |= rpc_cli_delBLOB(cli, var) > 0 ? 2 : 0;

	return ret;
}