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mcip-tool.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <getopt.h>
#include <stdbool.h>
#include <arpa/inet.h>
#include <sys/utsname.h>
#include "libmcip.h"
#include "m3_cli.h"
void safefree(void **pp);
/* read from MCIP */
static bool read_from_mcip(int sock, bool listen)
{
int i = 0;
int x = 0;
int sel = 0;
int length = 0;
fd_set fds_master, fds_tmp;
struct timeval tv;
uint8_t p[1500];
FD_ZERO(&fds_master);
FD_SET(sock, &fds_master);
for(; listen == true; ) {
FD_ZERO(&fds_tmp);
fds_tmp = fds_master;
tv.tv_sec = 10;
tv.tv_usec = 0;
sel = select(sock + 1, &fds_tmp, NULL, NULL, &tv);
if(sel > 0) {
/* read everything from socket */
if(FD_ISSET(sock, &fds_tmp)) {
x = read(sock, p + length, 1500 - length);
if(x > 0) {
length += x;
}
else if(x == -1) {
break;
}
else {
sleep(1);
}
}
}
/* check if length of received telegram is already here */
if (length >= 5) {
/* check if telegram is already complete */
if (length >= (p[3] | p[4] << 8)) {
/* print the received telegram */
for(i = i; i < length; i++) {
printf("%c", p[i]);
}
printf("\n");
listen = false;
}
}
}
return true;
}
/* init CLI session */
static bool init_cli(struct s_m3_cli **cli)
{
char *M3_CLI_UDS_SOCKET = "/devices/cli_no_auth/cli.socket";
/* initialise the CLI, opens the socket and retrieves the prompt */
*cli = m3_cli_initialise(M3_CLI_UDS_SOCKET, 300);
if (*cli == NULL) {
printf("Failed to initialise CLI (%d): %s\n", errno, strerror(errno));
printf("Maybe the container has not been added to the \"Read/Write\" user group for access the CLI without authentication?");
return false;
}
return true;
}
/* send as SMS via CLI */
static bool send_sms(char *number, char *text, char *modem)
{
struct s_m3_cli *cli = NULL;
char *cli_answer = NULL;
char buffer[1000] = { 0 };
/* initialise the CLI, opens the socket and retrieves the prompt */
if (init_cli(&cli) == false) {
return false;
}
/* configure the modem that should be used */
if (modem != NULL) {
sprintf(buffer, "help.debug.sms.modem=%s", modem);
}
else {
sprintf(buffer, "help.debug.sms.modem=lte2");
}
if (m3_cli_send(cli, buffer) == false) {
printf("Failed to set modem to use (%d): %s\n", errno, strerror(errno));
return false;
}
/* configure the recipients phone number */
sprintf(buffer, "help.debug.sms.recipient=%s", number);
if (m3_cli_send(cli, buffer) == false) {
printf("Failed to set the recipient phone number (%d): %s\n", errno, strerror(errno));
return false;
}
/* configure the SMS text */
sprintf(buffer, "help.debug.sms.text=-----BEGIN ...-----%s-----END ...-----", text);
if (m3_cli_send(cli, buffer) == false) {
printf("Failed to set the SMS text (%d): %s\n", errno, strerror(errno));
return false;
}
/* send the submit command */
if (m3_cli_query(cli, "help.debug.sms.submit=1", &cli_answer, 60000) == false) {
printf("Failed to set the SMS (%d): %s\n", errno, strerror(errno));
return false;
}
printf("SMS sending %s\n", cli_answer);
safefree((void **) & cli_answer);
m3_cli_shutdown(&cli);
return true;
}
/* switch_output */
static bool switch_output(char *output, char *state)
{
char *M3_CLI_UDS_SOCKET = "/devices/cli_no_auth/cli.socket";
struct s_m3_cli *cli = NULL;
char *cli_answer = NULL;
char buffer[1000] = { 0 };
/* initialise the CLI, opens the socket and retrieves the prompt */
cli = m3_cli_initialise(M3_CLI_UDS_SOCKET, 300);
if (cli == NULL) {
printf("Failed to initialise CLI (%d): %s\n", errno, strerror(errno));
printf("Maybe the container has not been added to the \"Read/Write\" user group for access the CLI without authentication?");
return false;
}
/* determine output */
sprintf(buffer, "help.debug.output.output=%s", output);
if (m3_cli_send(cli, buffer) == false) {
printf("Failed to determine output %s (%d): %s\n", output, errno, strerror(errno));
return false;
}
/* determine state */
sprintf(buffer, "help.debug.output.change=%s", state);
if (m3_cli_send(cli, buffer) == false) {
printf("Failed to set state of output %s (%d): %s\n", state, errno, strerror(errno));
return false;
}
/* submit */
sprintf(buffer, "help.debug.output.submit");
if (m3_cli_send(cli, buffer) == false) {
printf("Failed to set the the output %s (%d): %s\n", output, errno, strerror(errno));
return false;
}
printf("Output set: %s to %s\n", output, state);
safefree((void **) & cli_answer);
m3_cli_shutdown(&cli);
return true;
}
/* print all applet names of this multi binary */
static void usage_applets(void)
{
printf("This tool is an applet of the multi binary \"mcip-tool\".\n" \
"The names of the other applets are:\n" \
" sms-tool send or receive SMS\n" \
" get-input get state of inputs\n" \
" get-pulses receive pulses of an input\n" \
" set-output set the state of an output \n" \
" cli-cmd send a command via CLI\n" \
" container start/stop/restart a container\n" \
"\n");
return;
}
/* print help for generic mcip-tool and exit */
static void usage_tool(void)
{
printf("\nUsage: mcip-tool [OPTIONS]\n" \
"Send or receive MCIP messages.\n" \
"\n" \
" -h, --help Display this help and exit.\n" \
" -m --my-oid value OID (decimal) of this tool. This is mandatory in order to\n" \
" connect to the MCIP server.\n" \
" -t --to-oid value OID (decimal) to whom the message should be sent. If\n" \
" omitted, the message will be sent to OID 2 (the router).\n" \
" -l, --listen Listen for a message, print it on the console and exit.\n" \
" -s, --send \"value\" Send the <value> to the OID given.\n" \
" -p, --permanently Do not exit after receiving an MCIP telegram.\n" \
"\n");
usage_applets();
exit(0);
}
/* print help for sms-tool, input events and input pulses, then exit */
static void usage(char *tool, char *description)
{
printf("\nUsage: %s [OPTIONS]\n" \
"%s\n" \
"\n" \
" -h, --help Display this help and exit.\n" \
" -m --my-oid value OID (decimal) of this tool. \n" \
" -p, --permanently Do not exit after receiving an MCIP telegram.\n" \
" with --to-oid default.\n" \
"\n", tool, description);
exit(0);
}
/* print help for generic mcip-tool and exit */
static void usage_sms(void)
{
printf("\nUsage: sms-tool [OPTIONS]\n" \
"Send or receive SMS.\n" \
"\n" \
" -h, --help Display this help and exit.\n" \
"\n" \
"Receive SMS:\n" \
" -l, --listen Listen for a SMS, print it on the console and exit.\n" \
" -p, --permanently Exit after receiving an SMS\n" \
" -m --my-oid value OID (decimal) of this tool. This is mandatory for\n" \
" receiving SMS.\n" \
"\n" \
"Send SMS:\n" \
" -s, --send Send an SMS.\n" \
" -n, --number \"number\" Phone number to whom the SMS should be sent.\n" \
" -t, --text \"text\" SMS text to be sent.\n" \
" -i, --interface \"interface\" Set the interface (modem) to use for sending SMS.\n" \
"\n");
usage_applets();
exit(0);
}
/* print help for set-output, then exit */
static void usage_output(char *tool, char *description)
{
printf("\nUsage: %s [OPTIONS]\n" \
"%s\n" \
"\n" \
" -h, --help Display this help and exit.\n" \
" -o, --output Output to set. Syntax: <slot>.<output> (e.g. -o 4.1).\n" \
" -s, --state State of output (open, close).\n" \
"\n", tool, description);
usage_applets();
exit(0);
}
/* print help for cli-cmd, then exit */
static void usage_cli(char *tool, char *description)
{
printf("\nUsage: %s [OPTIONS] <CLI command>\n" \
"%s\n" \
"\n" \
" -h, --help Display this help and exit.\n" \
"\n", tool, description);
usage_applets();
exit(0);
}
/* print help for container, then exit */
static void usage_container(char *tool, char *description)
{
printf("\nUsage: %s [OPTIONS]\n" \
"%s\n" \
"\n" \
" -h, --help Display this help and exit.\n" \
" -n, --name Name of container to stop/restart; Default is the hostname.\n" \
" -0, --stop Stop a container.\n" \
" -1, --start Start a container.\n" \
" -r, --restart Restart the container.\n" \
"\n", tool, description);
usage_applets();
exit(0);
}
/* read the given parameters for generic mcip-tool */
static bool get_options_tool(int argc, char **argv, char *strOpts_tool, struct option *Opts_tool, uint16_t *my_oid, uint16_t *to_oid, bool *listen, char **send, bool *perma)
{
int iOpts = 0;
int c;
char *pArg = 0;
if (argc < 2) {
usage_tool();
}
while ((c = getopt_long(argc, argv, strOpts_tool, Opts_tool, &iOpts)) != -1) {
pArg = optarg;
if (pArg && (pArg[0] == '=')) {
pArg++;
}
switch (c) {
case 'm': {
if (pArg != NULL) {
*my_oid = atoi(pArg);
if (*my_oid < 2 || *my_oid > 65534) {
printf("The given value for my-oid must be in range of 2 to 65534)\n");
exit(-EINVAL);
}
}
break;
}
case 't': {
if (pArg != NULL) {
*to_oid = atoi(pArg);
if (*to_oid < 1 || *to_oid > 65534) {
printf("The given value for my-oid must be in range of 1 to 65534)\n");
exit(-EINVAL);
}
}
break;
}
case 'l': {
*listen = true;
break;
}
case 's': {
*send = pArg;
break;
}
case 'p': {
*perma = true;
break;
}
default:
case 'h': {
usage_tool();
}
}
}
return true;
}
/* read the given parameters for input events and input pulses */
static bool get_options(int argc, char **argv, char *strOpts_tool, struct option *Opts_tool, uint16_t *my_oid, bool *perma, char *description)
{
int iOpts = 0;
int c;
char *pArg = 0;
while ((c = getopt_long(argc, argv, strOpts_tool, Opts_tool, &iOpts)) != -1) {
pArg = optarg;
if (pArg && (pArg[0] == '=')) {
pArg++;
}
switch (c) {
case 'm': {
if (pArg != NULL) {
*my_oid = atoi(pArg);
if (*my_oid < 2 || *my_oid > 65534) {
printf("The given value for my-oid must be in range of 2 to 65534)\n");
exit(-EINVAL);
}
}
break;
}
case 'p': {
*perma = true;
break;
}
default:
case 'h': {
usage(argv[0], description);
}
}
}
return true;
}
/* read the given parameters for output */
static bool get_options_output(int argc, char **argv, char *strOpts_tool, struct option *Opts_tool, char **output, char **state, char *description)
{
int iOpts = 0;
int c;
char *pArg = 0;
while ((c = getopt_long(argc, argv, strOpts_tool, Opts_tool, &iOpts)) != -1) {
pArg = optarg;
if (pArg && (pArg[0] == '=')) {
pArg++;
}
switch (c) {
case 's': {
*state = pArg;
break;
}
case 'o': {
*output = pArg;
break;
}
default:
case 'h': {
usage_output(argv[0], description);
}
}
}
return true;
}
/* read the given parameters for sms-tool */
static bool get_options_sms(int argc, char **argv, char *strOpts_tool, struct option *Opts_tool, uint16_t *my_oid, bool *perma, bool *send, bool *listen, char **number, char **text, char **modem)
{
int iOpts = 0;
int c;
char *pArg = 0;
while ((c = getopt_long(argc, argv, strOpts_tool, Opts_tool, &iOpts)) != -1) {
pArg = optarg;
if (pArg && (pArg[0] == '=')) {
pArg++;
}
switch (c) {
case 'm': {
if (pArg != NULL) {
*my_oid = atoi(pArg);
if (*my_oid < 2 || *my_oid > 65534) {
printf("The given value for my-oid must be in range of 2 to 65534)\n");
exit(-EINVAL);
}
}
break;
}
case 'p': {
*perma = true;
break;
}
case 's': {
*send = true;
break;
}
case 'l': {
*listen = true;
break;
}
case 'i': {
if (pArg != NULL) {
*modem = pArg;
}
break;
}
case 'n': {
if (pArg != NULL) {
*number = pArg;
}
break;
}
case 't': {
if (pArg != NULL) {
*text = pArg;
}
break;
}
default:
case 'h': {
usage_sms();
}
}
}
return true;
}
/* read the given parameters for cli-cmd */
static bool get_options_cli(int argc, char **argv, char *strOpts_tool, struct option *Opts_tool, char **cmd, char *description)
{
int iOpts = 0;
int c;
char *pArg = 0;
while ((c = getopt_long(argc, argv, strOpts_tool, Opts_tool, &iOpts)) != -1) {
pArg = optarg;
if (pArg && (pArg[0] == '=')) {
pArg++;
}
switch (c) {
default:
case 'h': {
usage_cli(argv[0], description);
break;
}
}
}
if (optind < argc) {
*cmd = argv[optind];
}
return true;
}
/* read the given parameters for container */
static bool get_options_container(int argc, char **argv, char *strOpts_tool, struct option *Opts_tool, char **name, int *action, char *description)
{
int iOpts = 0;
int c;
char *pArg = 0;
while ((c = getopt_long(argc, argv, strOpts_tool, Opts_tool, &iOpts)) != -1) {
pArg = optarg;
if (pArg && (pArg[0] == '=')) {
pArg++;
}
switch (c) {
case 'r': {
*action = 2; /* restart */
break;
}
case '0': {
*action = 0; /* stop */
break;
}
case '1': {
*action = 1; /* start */
break;
}
case 'n': {
*name = pArg;
break;
}
default:
case 'h': {
usage_container(argv[0], description);
break;
}
}
}
return true;
}
/* get or send SMS */
static int main_sms_tool(int argc, char **argv)
{
bool perma = false;
bool again = true;
bool send = false;
bool listen = false;
char *number;
char *text;
char *modem;
uint16_t my_oid = 3;
uint8_t p[1500];
int sock = -1;
int i = 0;
int x = 0;
int sel = 0;
int length = 0;
fd_set fds_master, fds_tmp;
struct timeval tv;
struct oid_list *my_oids = NULL;
static char strOpts_sms[] = "hlm:psn:t:i:";
static struct option Opts_sms[] = {
{ "my-oid", required_argument, 0, 'm' },
{ "help", no_argument, 0, 'h' },
{ "permanently", no_argument, 0, 'p' },
{ "listen", no_argument, 0, 'l' },
{ "send", no_argument, 0, 's' },
{ "number", required_argument, 0, 'n' },
{ "text", required_argument, 0, 't' },
{ "interface", required_argument, 0, 'i' },
{ 0, 0, 0, 0 }
};
/* get parameters */
if (get_options_sms(argc, argv, strOpts_sms, Opts_sms, &my_oid, &perma, &send, &listen, &number, &text, &modem) == false) {
return -1;
}
/* send a SMS */
if (send == true && number != NULL && text != NULL) {
return send_sms(number, text, modem);
}
/* receive SMS */
if (listen == true) {
/* init my OIDs */
mcip_oid_append(&my_oids, my_oid);
/* connect to MCIP via UDS (Unix Domain Socket) */
sock = mcip_uds_register("/devices/mcip.socket", my_oids);
if(sock == -1) {
printf("Failed to register to MCIP\n");
mcip_oids_destroy(my_oids);
return -1;
}
/* read from MCIP */
FD_ZERO(&fds_master);
FD_SET(sock, &fds_master);
do {
again = true;
FD_ZERO(&fds_tmp);
fds_tmp = fds_master;
tv.tv_sec = 10;
tv.tv_usec = 0;
sel = select(sock + 1, &fds_tmp, NULL, NULL, &tv);
if(sel > 0) {
/* read everything from socket */
if(FD_ISSET(sock, &fds_tmp)) {
x = read(sock, p + length, 1500 - length);
if(x > 0) {
length += x;
}
else {
printf("Failed to read from MCIP\n");
/* reconnect to MCIP */
mcip_uds_deregister(&sock);
mcip_oids_destroy(my_oids);
/* init my OIDs */
mcip_oid_append(&my_oids, my_oid);
/* connect to MCIP via UDS (Unix Domain Socket) */
sock = mcip_uds_register("/devices/mcip.socket", my_oids);
if(sock == -1) {
printf("Failed to register to MCIP\n");
mcip_oids_destroy(my_oids);
return -1;
}
length = x = sel = 0;
}
}
}
/* check if length of received telegram is already here */
if (length > 7) {
/* check if telegram is already complete */
if (length >= (p[3] | p[4] << 8)) {
/* print the received telegram */
for(i = 7; i < ((p[3] | p[4] << 8) + 5); i++) {
printf("%c", p[i]);
}
printf("\n");
again = false;
}
length = x = sel = 0;
}
}
while (perma == true || again == true);
/* deregister */
mcip_uds_deregister(&sock);
/* free OID list */
mcip_oids_destroy(my_oids);
}
return 0;
}
/* get input change events or input pulses */
static int get_input(int argc, char **argv, bool pulses, char *description)
{
bool perma = false;
bool print = false;
bool repeat = false;
uint16_t my_oid = 4;
uint8_t p[1500];
int sock = -1;
int i = 0;
int x = 0;
int sel = 0;
int length = 0;
fd_set fds_master, fds_tmp;
struct timeval tv;
struct oid_list *my_oids = NULL;
static char strOpts[] = "hm:p";
static struct option Opts[] = {
{ "my-oid", required_argument, 0, 'm' },
{ "help", no_argument, 0, 'h' },
{ "permanently", no_argument, 0, 'p' },
{ 0, 0, 0, 0 }
};
/* get parameters */
if (get_options(argc, argv, strOpts, Opts, &my_oid, &perma, description) == false) {
return -1;
}
/* init my OIDs */
mcip_oid_append(&my_oids, my_oid);
/* connect to MCIP via UDS (Unix Domain Socket) */
sock = mcip_uds_register("/devices/mcip.socket", my_oids);
if(sock == -1) {
printf("Failed to register to MCIP\n");
mcip_oids_destroy(my_oids);
return -1;
}
/* read from MCIP */
FD_ZERO(&fds_master);
FD_SET(sock, &fds_master);
do {
FD_ZERO(&fds_tmp);
fds_tmp = fds_master;
tv.tv_sec = 10;
tv.tv_usec = 0;
sel = select(sock + 1, &fds_tmp, NULL, NULL, &tv);
if(sel > 0) {
/* read everything from socket */
if(FD_ISSET(sock, &fds_tmp)) {
x = read(sock, p + length, 1500 - length);
if(x > 0) {
length += x;
}
else {
printf("Failed to read from MCIP\n");
/* reconnect to MCIP */
mcip_uds_deregister(&sock);
mcip_oids_destroy(my_oids);
/* init my OIDs */
mcip_oid_append(&my_oids, my_oid);
/* connect to MCIP via UDS (Unix Domain Socket) */
sock = mcip_uds_register("/devices/mcip.socket", my_oids);
if(sock == -1) {
printf("Failed to register to MCIP\n");
mcip_oids_destroy(my_oids);
return -1;
}
length = x = sel = 0;
}
}
}
/* check if length of received telegram is already here */
if (length > 7) {
/* check if telegram is already complete */
if (length >= (p[3] | p[4] << 8)) {
/* only print if we should:
it is a input change event e.g. 2.1 is now LOW
it is a pulse event e.g. 2.1 pulses detected: 1 */
print = false;
if (pulses == false && p[11] == 'i') {
print = true;
}
else if (pulses == true && p[11] == 'p') {
print = true;
}
/* print the received telegram */
if (print == true) {
for(i = 7; i < ((p[3] | p[4] << 8) + 5); i++) {
printf("%c", p[i]);
}
printf("\n");
}
}
length = x = sel = 0;
}
/* do not abort after a wrong event, when the tool should exit after one event */
if (perma != true && print == false) {
repeat = true;
}
else {
repeat = false;
}
}
while (perma == true || repeat == true);
/* deregister */
mcip_uds_deregister(&sock);
/* free OID list */
mcip_oids_destroy(my_oids);
return 0;
}
/* get input events */
static int main_get_input(int argc, char **argv)
{
return get_input(argc, argv, false, "Receive input change events.");
}
/* get input pulses */
static int main_get_pulses(int argc, char **argv)
{
return get_input(argc, argv, true, "Receive input pulses.");
}
/* set output state */
static int set_output(int argc, char **argv, char *description)
{
char *output;
char *state;
static char strOpts[] = "ho:s:";
static struct option Opts[] = {
{ "help", no_argument, 0, 'h' },
{ "output", required_argument, 0, 'o' },
{ "state", required_argument, 0, 's' },
{ 0, 0, 0, 0 }
};
/* get parameters */
if (get_options_output(argc, argv, strOpts, Opts, &output, &state, description) == false) {
return -1;
}
switch_output(output, state);
return 0;
}
/* set output state */
static int main_set_output(int argc, char **argv)
{
return set_output(argc, argv, "Set output state.");
}
/* the normal mcip-tool operation */
static int main_mcip_tool(int argc, char **argv)
{
bool listen = 0;
bool perma = false;
uint16_t my_oid = 0;
uint16_t to_oid = 2;
char *send = NULL;
int sock = -1;
struct oid_list *my_oids = NULL;
char *s = NULL;
static char strOpts_tool[] = "hm:t:ls:p";
static struct option Opts_tool[] = {
{ "my-oid", required_argument, 0, 'm' },
{ "to-oid", required_argument, 0, 't' },
{ "help", no_argument, 0, 'h' },
{ "listen", no_argument, 0, 'l' },
{ "send", required_argument, 0, 's' },
{ "permanently", no_argument, 0, 'p' },
{ 0, 0, 0, 0 }
};
/* get parameters */
if (get_options_tool(argc, argv, strOpts_tool, Opts_tool, &my_oid, &to_oid, &listen, &send, &perma) == false) {
return -1;
}
/* init my OIDs */
mcip_oid_append(&my_oids, my_oid);
/* connect to MCIP via UDS (Unix Domain Socket) */
sock = mcip_uds_register("/devices/mcip.socket", my_oids);
if(sock == -1) {
printf("Failed to register to MCIP\n");
mcip_oids_destroy(my_oids);
return -1;
}
/* send the given string */
if (send != NULL) {
s = calloc(1, 2 + 2 + strlen(send));
s[0] = to_oid & 0x00FF;
s[1] = (to_oid & 0xFF00) >> 8;
if (my_oid == 0) {
strcat(s + 2, send);
if (mcip_send(sock, MCIP_CMD_WRITE, strlen(send) + 2, s) != 0) {
printf("Failed to send string to MCIP\n");
}
}
else {
s[2] = my_oid & 0x00FF;
s[3] = (my_oid & 0xFF00) >> 8;
strcat(s + 4, send);
if (mcip_send(sock, MCIP_CMD_WRITE, strlen(send) + 4, s) != 0) {
printf("Failed to send string to MCIP\n");
}
}
safefree((void **) &s);
}
/* read from MCIP */
do {
if (read_from_mcip(sock, listen) == false) {
printf("Failed to read from MCIP\n");
/* reconnect to MCIP */
mcip_uds_deregister(&sock);
mcip_oids_destroy(my_oids);
/* init my OIDs */
mcip_oid_append(&my_oids, my_oid);
/* connect to MCIP via UDS (Unix Domain Socket) */
sock = mcip_uds_register("/devices/mcip.socket", my_oids);
if(sock == -1) {
printf("Failed to register to MCIP\n");
mcip_oids_destroy(my_oids);
return -1;
}
}
}
while (perma == true);
/* deregister */
mcip_uds_deregister(&sock);
/* free OID list */
mcip_oids_destroy(my_oids);
return 0;
}
/* send a cli command and return the answer */
static int main_cli_cmd(int argc, char **argv)
{
struct s_m3_cli *cli = NULL;
char *cli_answer = NULL;
char *cmd;
static char strOpts[] = "h";
static struct option Opts[] = {
{ "help", no_argument, 0, 'h' },
{ 0, 0, 0, 0 }
};
/* get parameters */
if (get_options_cli(argc, argv, strOpts, Opts, &cmd,
"Send a command to the cli and print the answer") == false) {
return -1;
}
if (init_cli(&cli) == false) {
return -1;
}
/* send the command */
if (cmd != NULL) {
if (m3_cli_query(cli, cmd, &cli_answer, 6000) == false) {
printf("Failed to send the command (%d): %s\n", errno, strerror(errno));
return -1;
}
}
else {
printf("No command has been given\n");
return 0;
}