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#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <stdio.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <malloc.h>

#include <CSTAapdu.h>
#include <CSTAServices.h>
#include <CSTAEventReportArgument.h>
#include <MonitorStartArgument.h>

/* Определяем порт и адрес АТС. */
#define PORTNUM 33333
#define SERVER "192.168.0.101"

int s;
int write_out(const void *buffer, size_t size, void *app_key);

typedef struct buffer_s {
	char *buf;
	int len;
} buffer_t;

void
parseEventReport(char *data, int length)
{
	CSTAEventReportArgument_t *rep = 0;	/* Type to decode */
	asn_dec_rval_t rval;	/* Decoder return value    */
	size_t size;		/* Number of bytes read        */

	/* Decode the input buffer */
	rval = ber_decode(0, &asn_DEF_CSTAEventReportArgument,
	    (void **) &rep, data, length);
	if (rval.code != RC_OK)
		fprintf(stderr, "Broken encoding at byte %ld\n",
		    (long) rval.consumed);

	/* Print the decoded Rectangle type as XML */
	xer_fprint(stdout, &asn_DEF_CSTAEventReportArgument, rep);

	return 0;		/* Decoding finished successfully */
}

void
dump(unsigned char *buf, int len)
{
	int i, j;

	for (i = 0; i < len; i += 16) {
		for (j = 0; j < 16; j++)
			if (i + j < len)
				printf("%02X ", (unsigned char) buf[i + j]);
			else
				printf("   ");
		for (j = 0; j < 16; j++)
			if (i + j < len) {
				if (buf[i + j] >= 0x20)
					printf("%c",
					    (unsigned char) buf[i + j]);
				else
					printf(".");
			}
		printf("\n");
	}
}

void *
memmem(const void *haystack, size_t haystacklen,
    const void *needle, size_t needlelen)
{
	register const char *pn;
	register const char *ph;
	const char *plast;
	size_t n;

	if (needlelen == 0) {
		return (void *) haystack;
	}

	if (haystacklen >= needlelen) {
		ph = (const char *) haystack;
		pn = (const char *) needle;
		plast = ph + (haystacklen - needlelen);

		do {
			n = 0;
			while (ph[n] == pn[n]) {
				if (++n == needlelen) {
					return (void *) ph;
				}
			}
		} while (++ph <= plast);
	}

	return NULL;
}

#define	READ	0
#define WRITE	1

void
timestamp(int dir)
{
	time_t t;
	struct tm *l;

	t = time(NULL);
	l = localtime(&t);
	printf("\n[%02d:%02d:%02d %02d.%02d.%4d] ", l->tm_hour, l->tm_min,
	    l->tm_sec, l->tm_mday, l->tm_mon + 1, l->tm_year + 1900);

	if (dir == READ)
		printf("---- PBX -> PC ----\n");
	else
		printf("---- PC -> PBX ----\n");
}

void
pktdump(char *buf, int len)
{
	int i, j;
	char id[256], *cp, type, tmp[256], *c, *orig;
	long seq, l, origlen;
	CSTAapdu_t *apdu = 0;	/* Type to decode */
	RORSapdu_t *rors;
	asn_dec_rval_t rval;	/* Decoder return value    */
	size_t size;		/* Number of bytes read        */
	buffer_t *out;

	buf += 2;
	len -= 2;
	timestamp(READ);

	/* Decode the input buffer */
	rval = ber_decode(0, &asn_DEF_CSTAapdu, (void **) &apdu, buf, len);
	if (rval.code != RC_OK) {
		fprintf(stderr, "Broken encoding at byte %ld\n",
		    (long) rval.consumed);
		return 1;
	}
	switch (apdu->present) {
	case CSTAapdu_PR_svcRequest:
		printf("invokeID %d, serviceID %d\n",
		    apdu->choice.svcRequest.invokeID,
		    apdu->choice.svcRequest.serviceID);
		switch (apdu->choice.svcRequest.serviceID) {
		case 211:
			printf("SystemStatus Request\n");
			// send SystemStatus responce
			rors = calloc(1, sizeof(RORSapdu_t));
			rors->invokeID = apdu->choice.svcRequest.invokeID;
			rors->result.serviceID =
			    apdu->choice.svcRequest.serviceID;

			out = calloc(1, sizeof(buffer_t));
			out->buf = malloc(1024);
			der_encode(&asn_DEF_RORSapdu, rors, write_out, out);
			timestamp(WRITE);
			printf("invokeID %d, serviceID %d\n", rors->invokeID,
			    rors->result.serviceID);
			printf("SystemStatus Responce\n");
			// xer_fprint(stdout, &asn_DEF_RORSapdu, rors);

			memmove(out->buf + 2, out->buf, out->len);
			out->buf[0] = 0x00;
			out->buf[1] = out->len;
			out->len += 2;
			send(s, out->buf, out->len, 0);
			free(out->buf);
			break;
		case CSTAServices_cSTAeventReportSID:
			parseEventReport(apdu->choice.svcRequest.
			    serviceArgs.buf,
			    apdu->choice.svcRequest.serviceArgs.size);
			break;
		default:
			printf("Unknown svcRequest:\n");
			dump(apdu->choice.svcRequest.serviceArgs.buf,
			    apdu->choice.svcRequest.serviceArgs.size);
			break;
		}
		break;
	case CSTAapdu_PR_svcResult:
	case CSTAapdu_PR_svcError:
	case CSTAapdu_PR_svcReject:
	default:
		xer_fprint(stdout, &asn_DEF_CSTAapdu, apdu);
		break;
	}
}

int
write_out(const void *buffer, size_t size, void *app_key)
{
	buffer_t *dest = app_key;
	u_char *buf = buffer;
	int i;

	for (i = 0; i < size; i++)
		dest->buf[dest->len + i] = buf[i];
	dest->len += size;
	return 0;
}

int sendID = 1;

void
start_monitor(char *numer)
{
	ROIVapdu_t *pdu;
	MonitorStartArgument_t *rep;
	int i;
	buffer_t *buf;

	rep = calloc(1, sizeof(MonitorStartArgument_t));
	rep->monitorObject.present = CSTAObject_PR_deviceObject;
	rep->monitorObject.choice.deviceObject.deviceIdentifier.present =
	    DeviceID__deviceIdentifier_PR_dialingNumber;
	rep->monitorObject.choice.deviceObject.deviceIdentifier.
	    choice.dialingNumber.buf = numer;
	rep->monitorObject.choice.deviceObject.deviceIdentifier.
	    choice.dialingNumber.size = strlen(numer);

	pdu = calloc(1, sizeof(ROIVapdu_t));
	pdu->invokeID = sendID++;
	pdu->serviceID = CSTAServices_monitorStartSID;
	pdu->serviceArgs.buf = malloc(1024);

	buf = calloc(1, sizeof(buffer_t));
	buf->buf = pdu->serviceArgs.buf;
	der_encode(&asn_DEF_MonitorStartArgument, rep, write_out, buf);
	pdu->serviceArgs.size = buf->len;

	buf->len = 0;
	buf->buf = malloc(1024);
	der_encode(&asn_DEF_ROIVapdu, pdu, write_out, buf);

	timestamp(WRITE);
	xer_fprint(stdout, &asn_DEF_MonitorStartArgument, rep);

	memmove(buf->buf + 2, buf->buf, buf->len);
	buf->buf[0] = 0x00;
	buf->buf[1] = buf->len;
	buf->len += 2;
	send(s, buf->buf, buf->len, 0);

	free(buf->buf);
	free(pdu->serviceArgs.buf);
	// read_pkt();
}

int
read_pkt(int s, unsigned char *buf)
{
	int nbytes, total = 0, length;
	while (total < 2) {
		nbytes = recv(s, &buf[total], 2 - total, 0);
		if (nbytes == 0)
			return 0;	// соединение закрыто удаленно
		if (nbytes < 0)
			return -1;	// ошибка чтения из сокета
		total += nbytes;
	}
	if (buf[0] != 0)
		return -2;	// испорченный пакет
	if (buf[1] == 0)
		return 2;	// прочли 2 байта - пустой пакет
	length = ((unsigned char *) buf)[1] + 2;
	while (total < length) {
		nbytes = recv(s, &buf[total], length - total, 0);
		if (nbytes == 0)
			return 0;	// соединение закрыто удаленно
		if (nbytes < 0)
			return -1;	// ошибка чтения из сокета
		total += nbytes;
	}
	return total;
}

main(argc, argv)
     int argc;
     char *argv[];
{
	int nbytes;
	int pid;
	int nport;

	/* Начало программы. */
	struct sockaddr_in serv_addr;
	unsigned char buf[242] =
	    { 0x00, 0x25, 0x60, 0x23, 0x80, 0x02, 0x07, 0x80, 0xA1, 0x07, 0x06,
		0x05, 0x2B, 0x0C, 0x00, 0x81, 0x5A, 0xBE, 0x14, 0x28, 0x12,
		0x06, 0x07, 0x2B, 0x0C, 0x00, 0x82, 0x1D, 0x81, 0x48, 0xA0,
		0x07, 0xA0, 0x05, 0x03, 0x03, 0x00, 0x08, 0x00
	};
	int addrlen;
	unsigned long addr;

	nport = htons((u_short) PORTNUM);

	if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
		perror("Error calling socket()");
		return 1;
	}

	/* В serv_addr заносим адрес и порт АТС. */
	bzero(&serv_addr, sizeof(serv_addr));
	serv_addr.sin_family = AF_INET;
	serv_addr.sin_addr.s_addr = inet_addr(SERVER);
	serv_addr.sin_port = nport;

	if (connect(s, (struct sockaddr *) &serv_addr,
		sizeof(serv_addr)) == -1) {
		perror("Error calling connect()");
		return 1;
	}
	// посылаем #A-ASSOCIATE Request
	// dump(buf, 39);
	send(s, buf, 39, 0);

	// Получаем ответ от АТС.
	nbytes = recv(s, buf, sizeof(buf), 0);
	// printf("%d", nbytes)
	dump(buf, nbytes);

	if (nbytes < 0) {
		perror("Error calling recv()");
		return 1;
	}
	// проверяем на rejected-permanent
	const unsigned char seek[] = { 0xA2, 0x03, 0x02, 0x01, 0x01 };
	unsigned char *off_ptr = memmem(buf, sizeof(buf), seek, sizeof(seek));
	if (off_ptr) {
		printf("rejected-permanent\n");
		close(s);
		return 0;
	}
	// шлём #StartMonitor
	start_monitor("101");
	start_monitor("102");
	start_monitor("111");
	start_monitor("112");
	start_monitor("113");
	start_monitor("114");
	start_monitor("115");

	while (1) {		//цикл
		nbytes = read_pkt(s, buf);
		if (nbytes < 0) {
			perror("Error calling recv()");
			return 1;
		} else if (nbytes == 0) {
			printf("socket closed\n");
			return 1;
		}
		// dump(buf, nbytes);
		pktdump(buf, nbytes);
	}
	close(s);
	return 0;
}