/*************************************************************************
* (C) 2010 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: cli.c,v 1.4.2.3 2011/08/30 12:59:02 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
	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_cli_openBLOBClient() Connect to BLOB Server
 * @rpccli = RPC Client session
 * @Port = Port for bind server, if Port == 0 default port is selected
 * return: NULL == error or !=NULL connection to BLOB server established
 */
rpc_cli_t *
rpc_cli_openBLOBClient(rpc_cli_t * __restrict rpccli, u_short Port)
{
	rpc_cli_t *cli = NULL;
	struct sockaddr sa;
	struct sockaddr_in *sin = (struct sockaddr_in*) &sa;
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6*) &sa;
	struct sockaddr_un *sun = (struct sockaddr_un*) &sa;
	int n;

	if (!rpccli || 
			(rpccli->cli_sa.sa_family != AF_INET && rpccli->cli_sa.sa_family != AF_INET6 && 
			 rpccli->cli_sa.sa_family != AF_LOCAL)) {
		rpc_SetErr(EINVAL, "Error:: Invalid parameters can`t connect to BLOB server ...\n");
		return NULL;
	}
	if (!Port)
		Port = RPC_DEFPORT + 1;

	cli = malloc(sizeof(rpc_cli_t));
	if (!cli) {
		LOGERR;
		return NULL;
	} else
		memcpy(cli, rpccli, sizeof(rpc_cli_t));

	memcpy(&sa, &rpccli->cli_sa, sizeof sa);
	switch (rpccli->cli_sa.sa_family) {
		case AF_INET:
			sin->sin_port = htons(Port);
			memcpy(&cli->cli_sa, sin, sizeof(struct sockaddr));
			break;
		case AF_INET6:
			sin6->sin6_port = htons(Port);
			memcpy(&cli->cli_sa, sin6, sizeof(struct sockaddr));
			break;
		case AF_LOCAL:
			strlcat(sun->sun_path, ".blob", sizeof sun->sun_path);
			memcpy(&cli->cli_sa, sun, sizeof(struct sockaddr));
			break;
	}

	/* connect to BLOB server */
	cli->cli_sock = socket(cli->cli_sa.sa_family, SOCK_STREAM, 0);
	if (cli->cli_sock == -1) {
		LOGERR;
		free(cli);
		return NULL;
	}
	n = cli->cli_netbuf;
	if (setsockopt(cli->cli_sock, SOL_SOCKET, SO_SNDBUF, &n, sizeof n) == -1) {
		LOGERR;
		close(cli->cli_sock);
		free(cli->cli_parent);
		free(cli);
		return NULL;
	}
	if (setsockopt(cli->cli_sock, SOL_SOCKET, SO_RCVBUF, &n, sizeof n) == -1) {
		LOGERR;
		close(cli->cli_sock);
		free(cli->cli_parent);
		free(cli);
		return NULL;
	}
	if (connect(cli->cli_sock, &cli->cli_sa, sizeof cli->cli_sa) == -1) {
		LOGERR;
		free(cli);
		return NULL;
	}

	return cli;
}

/*
 * rpc_cli_closeBLOBClient() Close connection to BLOB server and free resources
 * @cli = BLOB Client session
 * return: none
 */
void
rpc_cli_closeBLOBClient(rpc_cli_t * __restrict cli)
{
	if (!cli) {
		rpc_SetErr(EINVAL, "Error:: Can`t close connection because parameter is null!\n");
		return;
	}

	shutdown(cli->cli_sock, SHUT_RDWR);
	close(cli->cli_sock);

	free(cli);
	cli = NULL;
}

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

/*
 * rpc_cli_openClient() Connect to RPC Server
 * @ProgID = ProgramID for RPC session request
 * @ProcID = ProcessID for RPC session request
 * @netBuf = Network buffer length, if =0 == BUFSIZ (also meaning max RPC packet)
 * @family = Family socket type, AF_INET or AF_INET6
 * @csHost = Host name or IP address for bind server
 * @Port = Port for bind server, if Port == 0 default port is selected
 * return: NULL == error or !=NULL connection to RPC server established
 */
rpc_cli_t *
rpc_cli_openClient(u_int ProgID, u_int ProcID, int netBuf, u_short family, const char *csHost, u_short Port)
{
	rpc_cli_t *cli = NULL;
	struct hostent *host = NULL;
	struct sockaddr sa;
	struct sockaddr_in *sin = (struct sockaddr_in*) &sa;
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6*) &sa;
	struct sockaddr_un *sun = (struct sockaddr_un*) &sa;
	int n;

	if (!csHost || (family != AF_INET && family != AF_INET6 && family != AF_LOCAL)) {
		rpc_SetErr(EINVAL, "Error:: Invalid parameters can`t connect to RPC server ...\n");
		return NULL;
	}
	if (!Port)
		Port = RPC_DEFPORT;
	if (!netBuf)
		netBuf = BUFSIZ;
	if (csHost && family != AF_LOCAL) {
		host = gethostbyname2(csHost, family);
		if (!host) {
			rpc_SetErr(h_errno, "Error:: %s\n", hstrerror(h_errno));
			return NULL;
		}
	}
	memset(&sa, 0, sizeof sa);
	sa.sa_family = family;
	switch (family) {
		case AF_INET:
			sin->sin_len = sizeof(struct sockaddr_in);
			sin->sin_port = htons(Port);
			if (csHost)
				memcpy(&sin->sin_addr, host->h_addr, host->h_length);
			break;
		case AF_INET6:
			sin6->sin6_len = sizeof(struct sockaddr_in6);
			sin6->sin6_port = htons(Port);
			if (csHost)
				memcpy(&sin6->sin6_addr, host->h_addr, host->h_length);
			break;
		case AF_LOCAL:
			sun->sun_len = sizeof(struct sockaddr_un);
			if (csHost)
				strlcpy(sun->sun_path, csHost, sizeof sun->sun_path);
			break;
		default:
			rpc_SetErr(EINVAL, "Error:: Invalid parameters can`t connect to RPC server ...\n");
			return NULL;
	}

	cli = malloc(sizeof(rpc_cli_t));
	if (!cli) {
		LOGERR;
		return NULL;
	} else
		memset(cli, 0, sizeof(rpc_cli_t));

	cli->cli_netbuf = netBuf;
	cli->cli_parent = malloc(sizeof(rpc_sess_t));
	if (!cli->cli_parent) {
		LOGERR;
		free(cli);
		return NULL;
	} else {
		((rpc_sess_t*) cli->cli_parent)->sess_version = RPC_VERSION;
		((rpc_sess_t*) cli->cli_parent)->sess_program = ProgID;
		((rpc_sess_t*) cli->cli_parent)->sess_process = ProcID;
	}

	switch (family) {
		case AF_INET:
			memcpy(&cli->cli_sa, sin, sizeof cli->cli_sa);
			break;
		case AF_INET6:
			memcpy(&cli->cli_sa, sin6, sizeof cli->cli_sa);
			break;
		case AF_LOCAL:
			memcpy(&cli->cli_sa, sun, sizeof cli->cli_sa);
			break;
	}

	/* connect to RPC server */
	cli->cli_sock = socket(family, SOCK_STREAM, 0);
	if (cli->cli_sock == -1) {
		LOGERR;
		free(cli->cli_parent);
		free(cli);
		return NULL;
	}
	n = cli->cli_netbuf;
	if (setsockopt(cli->cli_sock, SOL_SOCKET, SO_SNDBUF, &n, sizeof n) == -1) {
		LOGERR;
		close(cli->cli_sock);
		free(cli->cli_parent);
		free(cli);
		return NULL;
	}
	if (setsockopt(cli->cli_sock, SOL_SOCKET, SO_RCVBUF, &n, sizeof n) == -1) {
		LOGERR;
		close(cli->cli_sock);
		free(cli->cli_parent);
		free(cli);
		return NULL;
	}
	if (connect(cli->cli_sock, &cli->cli_sa, sizeof cli->cli_sa) == -1) {
		LOGERR;
		close(cli->cli_sock);
		free(cli->cli_parent);
		free(cli);
		return NULL;
	}

	return cli;
}

/*
 * rpc_cli_closeClient() Close connection to RPC server and free resources
 * @cli = RPC Client session
 * return: none
 */
void
rpc_cli_closeClient(rpc_cli_t * __restrict cli)
{
	if (!cli) {
		rpc_SetErr(EINVAL, "Error:: Can`t close connection because parameter is null!\n");
		return;
	}

	shutdown(cli->cli_sock, SHUT_RDWR);
	close(cli->cli_sock);

	if (cli->cli_parent)
		free(cli->cli_parent);
	free(cli);
	cli = NULL;
}


/*
 * rpc_cli_execCall() Execute RPC call
 * @cli = RPC Client session
 * @csModule = Module name, if NULL self binary
 * @csFunc = Function name for execute
 * @in_argc = IN count of arguments
 * @in_vars = IN RPC call array of rpc values
 * @out_argc = OUT returned count of arguments
 * @out_vars = OUT returned array of rpc values, must be free after use (see rpc_cli_freeVals())
 * return: -1 error or != -1 ok result
 */
int
rpc_cli_execCall(rpc_cli_t *cli, const char *csModule, const char *csFunc, int in_argc, 
		ait_val_t * __restrict in_vars, int *out_argc, ait_val_t ** __restrict out_vars)
{
	fd_set fds;
	u_char *buf, str[MAXPATHLEN + UCHAR_MAX + 1], *data;
	struct tagRPCCall *rpc;
	struct tagRPCRet *rrpc = NULL;
	int ret = 0, Limit = 0;
	register int i;
	ait_val_t *v;
	struct timeval tv = { DEF_RPC_TIMEOUT, 0 };

	if (!cli || !csFunc || (in_argc && !in_vars)) {
		rpc_SetErr(EINVAL, "Error:: Can`t execute call because parameter is null or invalid!\n");
		return -1;
	}

	buf = malloc(cli->cli_netbuf);
	if (!buf) {
		LOGERR;
		return -1;
	} else
		memset(buf, 0, cli->cli_netbuf);

	/* build RPC call string for hash */
	memset(str, 0, sizeof str);
	if (csModule)
		strlcpy((char*) str, csModule, sizeof str);
	strlcat((char*) str, "__", sizeof str);
	strlcat((char*) str, csFunc, sizeof str);

	/* prepare RPC call */
	rpc = (struct tagRPCCall*) buf;
	memcpy(&rpc->call_session, cli->cli_parent, sizeof rpc->call_session);
	rpc->call_argc = in_argc;
	rpc->call_tag = crcFletcher16((u_short*) str, sizeof str / 2);
	rpc->call_hash = hash_fnv((char*) str, sizeof str);
	Limit = sizeof(struct tagRPCCall);

	if (in_argc) {
		/* marshaling variables */
		v = (ait_val_t*) (buf + sizeof(struct tagRPCCall));
		if (in_argc * sizeof(ait_val_t) > cli->cli_netbuf - Limit) {
			rpc_SetErr(EMSGSIZE, "Error:: in prepare RPC packet values (-7) ...\n");
			free(buf);
			return -7;
		} else
			Limit += in_argc * sizeof(ait_val_t);
		memcpy(v, in_vars, in_argc * sizeof(ait_val_t));

		/* adding additional data */
		data = (u_char*) v + in_argc * sizeof(ait_val_t);
		for (i = 0; i < in_argc && !ret; i++) {
			switch (AIT_TYPE(&in_vars[i])) {
				case buffer:
					if (Limit + AIT_LEN(&in_vars[i]) > cli->cli_netbuf) {
						ret = -7;
						break;
					}

					memcpy(data, in_vars[i].val.buffer, AIT_LEN(&in_vars[i]));
					v[i].val.buffer = (uint8_t*) ((void*) data - (void*) v);
					data += AIT_LEN(&in_vars[i]);
					Limit += AIT_LEN(&in_vars[i]);
					break;
				case string:
					if (Limit + AIT_LEN(&in_vars[i]) > cli->cli_netbuf) {
						ret = -7;
						break;
					}

					memcpy(data, in_vars[i].val.string, AIT_LEN(&in_vars[i]));
					v[i].val.string = (int8_t*) ((void*) data - (void*) v);
					data += AIT_LEN(&in_vars[i]);
					Limit += AIT_LEN(&in_vars[i]);
					break;
				default:
					break;
			}
		}
		if (ret < 0) {
			rpc_SetErr(EMSGSIZE, "Error:: in prepare RPC packet (-7) ...\n");
			free(buf);
			return ret;
		}
	}

	if ((ret = send(cli->cli_sock, buf, Limit, 0)) == -1) {
		LOGERR;
		free(buf);
		return -1;
	}
	if (ret != Limit) {
		rpc_SetErr(ECANCELED, "Error:: in send RPC request, should be send %d bytes, really is %d\n", 
				Limit, ret);
		free(buf);
		return -9;
	}

	/* reply from RPC server */
	FD_ZERO(&fds);
	FD_SET(cli->cli_sock, &fds);
	if ((ret = select(cli->cli_sock + 1, &fds, NULL, NULL, &tv)) < 1) {
		if (ret)
			LOGERR;
		else
			rpc_SetErr(ETIMEDOUT, "Error:: timeout, no return from RPC server?\n");

		free(buf);
		return -1;
	}
	memset(buf, 0, cli->cli_netbuf);
	if ((ret = recv(cli->cli_sock, buf, cli->cli_netbuf, 0)) == -1) {
		LOGERR;
		free(buf);
		return -3;
	}
	if (!ret) {	/* receive EOF! */
		free(buf);
		return 0;
	}
	if (ret < sizeof(struct tagRPCRet)) {
		rpc_SetErr(EMSGSIZE, "Error:: too short RPC packet ...\n");
		free(buf);
		return -4;
	} else
		rrpc = (struct tagRPCRet*) buf;
	/* check RPC packet session info */
	if (memcmp(&rrpc->ret_session, cli->cli_parent, sizeof rrpc->ret_session)) {
		rpc_SetErr(EINVAL, "Error:: get invalid RPC session ...\n");
		free(buf);
		return -5;
	} else
		Limit = sizeof(struct tagRPCRet);
	if (rrpc->ret_retcode < 0 && rrpc->ret_errno) {
		rpc_SetErr(rrpc->ret_errno, "Error::Server side: %d %s\n", 
				rrpc->ret_retcode, strerror(rrpc->ret_errno));
		free(buf);
		return -6;
	}
	if (rrpc->ret_argc * sizeof(ait_val_t) > cli->cli_netbuf - Limit) {
		rpc_SetErr(EMSGSIZE, "Error:: reply RPC packet is too long ...\n");
		free(buf);
		return -7;
	} else
		Limit += rrpc->ret_argc * sizeof(ait_val_t);
	/* RPC is OK! Go decapsulate variables ... */
	if (rrpc->ret_argc) {
		*out_argc = rrpc->ret_argc;
		*out_vars = calloc(rrpc->ret_argc, sizeof(ait_val_t));
		if (!*out_vars) {
			LOGERR;
			*out_argc = 0;
			free(buf);
			return -1;
		} else
			memcpy(*out_vars, buf + sizeof(struct tagRPCRet), Limit - sizeof(struct tagRPCRet));

		/* RPC received variables types OK! */
		data = (u_char*) buf + Limit;
		for (i = 0; i < rrpc->ret_argc; i++)
			switch (AIT_TYPE(&(*out_vars)[i])) {
				case buffer:
					if (AIT_LEN(&(*out_vars)[i]) > cli->cli_netbuf - Limit) {
						rpc_SetErr(EMSGSIZE, "Error:: Too long RPC packet ...\n");
						free(*out_vars);
						*out_vars = NULL;
						*out_argc = 0;
						free(buf);
						return -7;
					} else
						Limit += AIT_LEN(&(*out_vars)[i]);

					(*out_vars)[i].val.buffer = malloc(AIT_LEN(&(*out_vars)[i]));
					if (!(*out_vars)[i].val.buffer) {
						rpc_SetErr(errno, "Error:: in prepare RPC reply ...\n");
						free(*out_vars);
						*out_vars = NULL;
						*out_argc = 0;
						free(buf);
						return -1;
					} else
						memcpy((*out_vars)[i].val.buffer, data, AIT_LEN(&(*out_vars)[i]));
				       	data += AIT_LEN(&(*out_vars)[i]);
					break;
				case string:
					if (AIT_LEN(&(*out_vars)[i]) > cli->cli_netbuf - Limit) {
						rpc_SetErr(EMSGSIZE, "Error:: Too long RPC packet ...\n");
						free(*out_vars);
						*out_vars = NULL;
						*out_argc = 0;
						free(buf);
						return -7;
					} else
						Limit += AIT_LEN(&(*out_vars)[i]);

					(*out_vars)[i].val.string = malloc(AIT_LEN(&(*out_vars)[i]));
					if (!(*out_vars)[i].val.string) {
						rpc_SetErr(errno, "Error:: in prepare RPC reply ...\n");
						free(*out_vars);
						*out_vars = NULL;
						*out_argc = 0;
						free(buf);
						return -1;
					} else
						memcpy((*out_vars)[i].val.string, data, AIT_LEN(&(*out_vars)[i]));
				       	data += AIT_LEN(&(*out_vars)[i]);
					break;
				default:
					break;
			}
	} else {
		if (out_argc)
			*out_argc = 0;
		if (out_vars)
			*out_vars = NULL;
	}

	ret = rrpc->ret_retcode;
	free(buf);
	return ret;
}

/*
 * rpc_cli_freeVals() Free ait_val_t array returned from RPC call
 * @args = Number of arguments in array
 * @vars = Value elements
 * return: none
 */
inline void
rpc_cli_freeVals(int args, ait_val_t * __restrict vars)
{
	register int i;

	if (!vars)
		return;

	for (i = 0; i < args; i++)
		AIT_FREE_VAL(&vars[i]);

	free(vars);
	vars = NULL;
}