/*************************************************************************
* (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: mqtt_subs.c,v 1.5 2017/10/08 22:49:25 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, 2013
	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"
#include "rtlm.h"
#include "mqtt.h"
#include "client.h"


extern char compiled[], compiledby[], compilehost[];
volatile intptr_t Kill;
sched_root_task_t *root;

struct tagArgs *args;


static void
Usage(void)
{
	printf(	" -= MQTT Subscriber Client =- Subscriber from ELWIX\n"
		"=== %s@%s === Compiled: %s ===\n\n"
		" Syntax: mqtt_subs [options] <connect_to_broker[:port]> <ConnectID> [exec_script <value>]\n\n"
		"\t-l <value2file>\t\tSave received values to file\n"
		"\t-u\t\t\tUnsubscribe given topic(s)\n"
		"\t-s <topic[|QoS]>\tSubscribe for this topic, if wish add different |QoS to topic\n"
		"\t-d\t\t\tSend duplicate message\n\n"
		"\t-C\t\t\tNot clear before connect!\n"
		"\t-p <port>\t\tDifferent port for connect (default: 1883)\n"
		"\t-T <timeout>\t\tKeep alive timeout in seconds\n"
		"\t-U <username>\t\tUsername\n"
		"\t-P <password>\t\tPassword\n"
		"\t-W <topic>\t\tWill Topic\n"
		"\t-M <message>\t\tWill Message\n\n"
		"\t-D\t\t\tDaemon mode\n"
		"\t-v\t\t\tVerbose (more -vvv, more verbose)\n"
		"\t-h\t\t\tHelp! This screen\n\n", 
		compiledby, compilehost, compiled);
}

static void
cleanArgs(struct tagArgs * __restrict args)
{
	mqtt_msgFree(&args->msg, 42);
	mqtt_subFree(&args->subscr);
	AIT_FREE_VAL(&args->Will.Msg);
	AIT_FREE_VAL(&args->Will.Topic);
	AIT_FREE_VAL(&args->User);
	AIT_FREE_VAL(&args->Pass);
	AIT_FREE_VAL(&args->Publish);
	AIT_FREE_VAL(&args->Value);
	AIT_FREE_VAL(&args->ConnID);
}

static int
Subscribe(int sock, FILE *lf)
{
	u_char *qoses, *qos;
	u_short mid;
	mqtt_subscr_t *sub;

#ifdef __NetBSD__
	srandom(getpid() ^ time(NULL));
#else
	srandomdev();
#endif
	mid = random() % USHRT_MAX;

	printf(" > Execute SUBSCRIBE request #%d ... ", mid);
	qoses = mqtt_cli_Subscribe(args->cli, args->subscr, mid, args->Dup, MQTT_QOS_ACK);
	if (!qoses) {
		printf("Error:: Subscribe #%d - %s\n", mqtt_GetErrno(), mqtt_GetError());
		return -1;
	} else
		printf("OK\n");

	for (sub = args->subscr, qos = qoses; sub->sub_topic.msg_base; sub++, qos++)
		printf("  + Topic %s with QoS %d subscribe %s\n", (char*)
				sub->sub_topic.msg_base, sub->sub_ret, *qos ? "done" : "failed");

	free(qoses);
	return 0;
}

static int
Unsubscribe(int sock)
{
	u_short mid;

#ifdef __NetBSD__
	srandom(getpid() ^ time(NULL));
#else
	srandomdev();
#endif
	mid = random() % USHRT_MAX;

	printf(" > Execute UNSUBSCRIBE request #%d ... ", mid);
	if (mqtt_cli_Unsubscribe(args->cli, args->subscr, mid, args->Dup, MQTT_QOS_ACK)) {
		printf("Error:: Unsubscribe #%d - %s\n", mqtt_GetErrno(), mqtt_GetError());
		return -1;
	} else
		printf("OK\n");

	return 0;
}

static void
sigz(int sig)
{
	int stat;

	switch (sig) {
		case SIGINT:
		case SIGTERM:
			Kill++;
			break;
		case SIGCHLD:
			while (waitpid(-1, &stat, WNOHANG) > 0);
			break;
	}
}


static void *
execProc(sched_task_t *task)
{
	FILE *f;
	char szLine[MAXPATHLEN + BUFSIZ] = { 0 };

	snprintf(szLine, sizeof szLine, "%s '%s' %hu %u", AIT_GET_STR(&args->Value), 
			(char*) TASK_ARG(task), (u_short) TASK_VAL(task), (u_int) TASK_DATLEN(task));
	if (TASK_ARG(task))
		e_free(TASK_ARG(task));

	f = popen(szLine, "w");
	if (!f) {
		ESYSERR(0);
		return NULL;
	} else
		fputs(TASK_DATA(task), f);
	pclose(f);
	return NULL;
}

static void *
pubRX(sched_task_t *task)
{
	int siz, rlen;
	char szTime[STRSIZ] = { 0 }, szTopic[STRSIZ] = { 0 };
	void *data = NULL;
	u_short mid;
	time_t tim;
	struct mqtthdr *hdr;

	rlen = RecvFrom(TASK_FD(task));
	if (rlen == -1)
		goto end;
	if (!rlen) {
		Kill++;
		return NULL;
	}

	while (rlen > 0) {
		hdr = (struct mqtthdr*) args->msg->msg_base;

		switch (hdr->mqtt_msg.type) {
			case MQTT_TYPE_PUBLISH:
				siz = mqtt_readPUBLISH(args->msg, szTopic, sizeof szTopic, &mid, &data);
				if (siz == -1)
					goto end;
				else {
					siz = mqtt_pktLen(hdr);
					rlen -= siz;
					EVERBS(4) printf("Remains %d bytes, packet %d bytes\n", rlen, siz);
				}

				/* send to output */
				tim = time(NULL);
				strftime(szTime, sizeof szTime, "%Y-%m-%d %H:%M:%S", localtime(&tim));
				fprintf(TASK_ARG(task), "\n[%s] Message ID: %04hu, QoS: %hhu, "
						"Length: %u, Topic: %s\n", szTime, mid, hdr->mqtt_msg.qos, 
						siz, szTopic);

				if (data) {
					fputs((const char*) data, TASK_ARG(task));
					free(data);
				}

				fprintf(TASK_ARG(task), "\n");
				fflush(TASK_ARG(task));

				/* if exists exec script */
				if (!AIT_ISEMPTY(&args->Value))
					schedEvent(root, execProc, e_strdup(szTopic), mid, data, siz);

				memmove(args->msg->msg_base, args->msg->msg_base + siz, rlen);
				break;
			case MQTT_TYPE_PINGREQ:
				siz = mqtt_msgPINGRESP(args->msg);
				if (siz == -1)
					goto end;
				else
					rlen -= siz;

				/* send ping reply */
				if (SendTo(TASK_FD(task), siz) == -1)
					goto end;

				memmove(args->msg->msg_base, args->msg->msg_base + siz, rlen);
				break;
			default:
				EVERBS(1) printf("Unwanted message type #%d ...\n", hdr->mqtt_msg.type);
				goto end;
		}
	}
end:
	schedReadSelf(task);
	return NULL;
}


int
main(int argc, char **argv)
{
	char ch, un = 0, idx = 0, batch = 1;
	ait_val_t val;
	u_short port = atoi(MQTT_PORT);
	mqtt_subscr_t *sub;
	int ret = 0;
	char *str, szStr[STRSIZ], szLogName[MAXPATHLEN] = { 0 };
	FILE *lf;
	struct sigaction sa;

	if (!(args = e_malloc(sizeof(struct tagArgs)))) {
		printf("Error:: in arguments #%d - %s\n", errno, strerror(errno));
		return 1;
	} else
		memset(args, 0, sizeof(struct tagArgs));
	if (!(args->subscr = mqtt_subAlloc(idx))) {
		printf("Error:: in subscribes array #%d - %s\n", mqtt_GetErrno(), mqtt_GetError());
		e_free(args);
		return 1;
	} else
		args->free = cleanArgs;

	if (!(args->msg = mqtt_msgAlloc(USHRT_MAX))) {
		printf("Error:: in mqtt buffer #%d - %s\n", mqtt_GetErrno(), mqtt_GetError());
		args->free(args);
		e_free(args);
		return 1;
	}

	AIT_SET_STR(&args->ConnID, "");
	AIT_SET_STR(&args->User, "");
	AIT_SET_STR(&args->Pass, "");

	args->ka = MQTT_KEEPALIVE;
	while ((ch = getopt(argc, argv, "T:U:P:p:s:q:dl:W:M:CDvuh")) != -1)
		switch (ch) {
			case 'T':
				args->ka = (u_short) strtol(optarg, NULL, 0);
				break;
			case 'M':
				AIT_FREE_VAL(&args->Will.Msg);
				AIT_SET_STR(&args->Will.Msg, optarg);
				break;
			case 'W':
				AIT_FREE_VAL(&args->Will.Topic);
				AIT_SET_STR(&args->Will.Topic, optarg);
				break;
			case 'U':
				AIT_FREE_VAL(&args->User);
				AIT_SET_STR(&args->User, optarg);
				break;
			case 'P':
				AIT_FREE_VAL(&args->Pass);
				AIT_SET_STR(&args->Pass, optarg);
				break;
			case 'p':
				port = (u_short) strtol(optarg, NULL, 0);
				break;
			case 's':
				sub = mqtt_subRealloc(&args->subscr, idx + 1);
				if (!sub) {
					printf("Error:: #%d - %s\n", mqtt_GetErrno(), mqtt_GetError());
					args->free(args);
					e_free(args);
					return 1;
				} else
					sub += idx++;

				strlcpy(szStr, optarg, sizeof szStr);
				if ((str = strchr(szStr, '|'))) {
					*str++ = 0;
					*str -= 0x30;
					if (*str < 0 || *str > MQTT_QOS_RESERVED)
						sub->sub_ret = (u_char) args->QoS;
					else
						sub->sub_ret = (u_char) *str;
				} else
					sub->sub_ret = (u_char) args->QoS;
				sub->sub_topic.msg_base = strdup(szStr);
				sub->sub_topic.msg_len = strlen(szStr);
				break;
			case 'q':
				args->QoS = (char) strtol(optarg, NULL, 0);
				if (args->QoS > MQTT_QOS_EXACTLY) {
					printf("Error:: invalid QoS level %d\n", args->QoS);
					args->free(args);
					e_free(args);
					return 1;
				}
				break;
			case 'd':
				args->Dup++;
				break;
			case 'C':
				args->notClear++;
				break;
			case 'l':
				strlcpy(szLogName, optarg, sizeof szLogName);
				break;
			case 'D':
				batch = 0;
				break;
			case 'v':
				e_incVerbose;
				break;
			case 'u':
				un = 1;
				break;
			case 'h':
			default:
				args->free(args);
				e_free(args);
				Usage();
				return 1;
		}
	argc -= optind;
	argv += optind;
	if (argc < 2) {
		printf("Error:: host for connect not found, connection id or topic not supplied!\n\n");
		args->free(args);
		e_free(args);
		Usage();
		return 1;
	} else {
		AIT_FREE_VAL(&args->ConnID);
		AIT_SET_STR(&args->ConnID, argv[1]);
	}
	if (argc > 2) {
		AIT_FREE_VAL(&args->Value);
		AIT_SET_STR(&args->Value, argv[2]);
	}
	if (!e_gethostbyname(*argv, port, &args->addr)) {
		printf("Error:: host not valid #%d - %s\n", elwix_GetErrno(), elwix_GetError());
		args->free(args);
		e_free(args);
		Usage();
		return 1;
	}
	printf("Connecting to %s:%d ... ", e_n2addr(&args->addr, &val), e_n2port(&args->addr));
	AIT_FREE_VAL(&val);

	memset(&sa, 0, sizeof sa);
	sa.sa_handler = sigz;
	sigemptyset(&sa.sa_mask);
	sigaction(SIGTERM, &sa, NULL);
	sigaction(SIGINT, &sa, NULL);
	sigaction(SIGCHLD, &sa, NULL);

	if (!batch)
		switch (fork()) {
			case -1:	/* error */
				printf("Error:: in fork() #%d - %s\n", errno, strerror(errno));
				ret = 2;
				goto end;
			case 0:		/* child */
				setsid();

				ret = open("/dev/null", O_RDWR);
				if (ret != -1) {
					dup2(ret, STDIN_FILENO);
					dup2(ret, STDOUT_FILENO);
					dup2(ret, STDERR_FILENO);
					close(ret);
				}
				break;
			default:	/* parent */
				printf(">> Service started\n");
				ret = 0;
				goto end;
		}

	if (!(args->cli = mqtt_cli_Open(&args->addr.sa, args->ka))) {
		ret = 2;
		goto end;
	}

	switch ((ret = ConnectClient(args->cli->sock))) {
		case -1:
			printf(">> FAILED!\n");
			break;
		case MQTT_RETCODE_ACCEPTED:
			printf(">> OK\n");
			break;
		case MQTT_RETCODE_REFUSE_VER:
			printf(">> Incorrect version\n");
			break;
		case MQTT_RETCODE_REFUSE_ID:
			printf(">> Incorrect connectID\n");
			break;
		case MQTT_RETCODE_REFUSE_UNAVAIL:
			printf(">> Service unavailable\n");
			break;
		case MQTT_RETCODE_REFUSE_USERPASS:
			printf(">> Refuse user/pass\n");
			break;
		case MQTT_RETCODE_DENIED:
			printf(">> DENIED.\n");
			break;
	}

	if (ret == MQTT_RETCODE_ACCEPTED) {
		if (*szLogName)
			lf = fopen(szLogName, "w");
		else
			lf = stdout;
		if (lf) {
			ret = Subscribe(args->cli->sock, lf);

			root = schedBegin();

			schedRead(root, pubRX, lf, args->cli->sock, NULL, 0);
			schedRun(root, &Kill);

			schedEnd(&root);

			if (un)
				Unsubscribe(args->cli->sock);
			fclose(lf);
		} else
			printf("Error:: in output file #%d - %s\n", errno, strerror(errno));
	} else
		ret = 3;

	mqtt_cli_Close(&args->cli);
end:
	args->free(args);
	e_free(args);
	return ret;
}