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server.c
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/* Raspberry Control - Control Raspberry Pi with your Android Device
*
* Copyright (C) Lukasz Skalski <lukasz.skalski@op.pl>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#define _GNU_SOURCE
#include "util.h"
#include "devman.h"
#include <inttypes.h>
#include <gio/gio.h>
#include <glib-unix.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <ctype.h>
#include <dirent.h>
#include <pwd.h>
#include <jansson.h>
#include <libwebsockets.h>
#ifdef HAVE_SYSTEMD
#include <systemd/sd-journal.h>
#endif
#define MAX_PAYLOAD 10000
/*
* Global variables
*/
static struct libwebsocket_context *context;
char board_revision[4];
char *notification;
gboolean opt_use_ssl = FALSE;
gboolean opt_no_daemon = FALSE;
gboolean opt_show_json_obj = FALSE;
gboolean exit_loop = FALSE;
gboolean send_notification = FALSE;
gint port = 8080;
/*
* Supported 1-wire temperature sensors
*/
#define DS18B20_CODE "28"
#define DS1820_CODE "10"
/*
* Commandline options
*/
GOptionEntry entries[] =
{
{ "use-ssl", 's', 0, G_OPTION_ARG_NONE, &opt_use_ssl, "Use SSL to encrypt the connection between client and server", NULL},
{ "no-daemon", 'n', 0, G_OPTION_ARG_NONE, &opt_no_daemon, "Don't detach Raspberry Control into the background", NULL},
{ "show-json", 'j', 0, G_OPTION_ARG_NONE, &opt_show_json_obj, "Show JSON objects in daemon log file", NULL},
{ "port", 'p', 0, G_OPTION_ARG_INT, &port, "Port number [default: 8080]", NULL },
{ NULL }
};
/*
* Static buffer
*/
struct per_session_data {
unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + MAX_PAYLOAD + LWS_SEND_BUFFER_POST_PADDING];
unsigned int len;
unsigned int index;
};
/*
* print_log()
*/
static void
print_log (gint msg_priority, const gchar *msg, ...)
{
va_list arg;
va_start(arg, msg);
GString *log = g_string_new(NULL);
g_string_vprintf (log, msg, arg);
#ifdef DEBUG
g_print ("%s", log->str);
#endif
#ifdef HAVE_SYSTEMD
sd_journal_print (msg_priority, log->str);
#else
syslog (msg_priority, log->str);
#endif
g_string_free(log, TRUE);
va_end(arg);
}
/*
* SIGINT handler
*/
static gboolean
sigint_handler ()
{
libwebsocket_cancel_service (context);
exit_loop = TRUE;
return TRUE;
}
/*
* check_board_revision()
*/
gboolean check_board_revision ()
{
FILE *fd;
char fileline [200];
char *ptr;
fd = fopen("/proc/cpuinfo", "r");
if (!fd)
return FALSE;
while (1)
{
if (fgets (fileline, 200, fd) == NULL)
break;
if (strncmp(fileline, "Revision", 8) == 0)
{
fileline [strlen(fileline)-1] = 0;
ptr = strstr (fileline, ":");
if (ptr == NULL)
{
fclose (fd);
return FALSE;
}
ptr += 2;
strncpy (board_revision, ptr, 4);
print_log (LOG_INFO, "(main) Board Revision: %s\n", board_revision);
break;
}
}
fclose (fd);
return TRUE;
}
/*
* dbus_notification_callback()
*/
void dbus_notification_callback (GDBusConnection *connection,
const gchar *sender_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *signal_name,
GVariant *parameters,
gpointer user_data)
{
json_t *notification_obj;
char *notification_msg;
print_log (LOG_INFO, "(notification) NOTIFICATION\n");
send_notification = FALSE;
notification_msg = NULL;
free (notification);
/* UDisk - 'DeviceAdded' */
if ((strcmp(interface_name, "org.freedesktop.UDisks") == 0) &&
(strcmp(signal_name, "DeviceAdded") == 0))
asprintf (¬ification_msg, "[UDisks] %s", signal_name);
/* CUPS - 'JobQueuedLocal' */
if (strcmp(signal_name, "JobQueuedLocal") == 0)
asprintf (¬ification_msg, "[CUPS] %s", signal_name);
if (!notification_msg)
asprintf (¬ification_msg, "(not set)");
notification_obj = json_pack ("{s:s}", "Notification", notification_msg);
notification = json_dumps (notification_obj, 0);
free (notification_msg);
json_decref (notification_obj);
send_notification = TRUE;
}
/*
* dbus_set_notification()
*/
void
dbus_set_notification (GDBusConnection *connection,
const gchar *sender,
const gchar *interface_name,
const gchar *member,
const gchar *object_path)
{
print_log (LOG_INFO, "(notification) new notification subscription\n");
g_dbus_connection_signal_subscribe (connection,
sender,
interface_name,
member,
object_path,
NULL,
G_DBUS_SIGNAL_FLAGS_NONE,
dbus_notification_callback,
NULL,
NULL);
/* TODO - collect all subscription identifiers */
}
/*
* send_error()
*
* JSON Object
* ===========
*
* {
* "Error" : "Can't open device"
* }
*/
unsigned int
send_error (unsigned char *buffer, const char *error)
{
json_t *error_obj;
char *error_str;
int error_len;
error_obj = json_pack ("{s:s}", "Error", error);
error_str = json_dumps (error_obj, 0);
error_len = strlen (error_str);
memcpy (buffer, error_str, error_len);
json_decref (error_obj);
free (error_str);
return error_len;
}
/*
* cmd_GetGPIO()
*
* JSON Object
* ===========
*
* {
* "GPIOState": [
* {
* "gpio" : 6,
* "value" : 1,
* "direction": "in"
* },
* {
* "gpio" : 3,
* "value" : 0,
* "direction": "out"
* },
* .
* .
* ],
* "Revision" : "0002"
* }
*/
unsigned int
cmd_GetGPIO (struct libwebsocket *wsi, unsigned char *buffer)
{
json_t *gpio_obj;
json_t *gpio_array_obj;
DIR *gpio_dir;
FILE *fd, *fp;
struct dirent *gpio_num_dir;
char filepath [PATH_MAX];
char fileline1 [5];
char fileline2 [5];
char *gpio_str;
int gpio_len;
print_log (LOG_INFO, "(%p) (cmd_GetGPIO) processing request\n", wsi);
gpio_dir = opendir ("/sys/class/gpio");
if (gpio_dir == NULL)
{
print_log (LOG_ERR, "(%p) (cmd_GetGPIO) unable to read the list of exported GPIO's\n", wsi);
return send_error (buffer, "Unable to read the list of exported GPIO's");
}
gpio_obj = json_object();
gpio_array_obj = json_array();
while(1)
{
json_t *gpio_num_obj;
gpio_num_dir = readdir (gpio_dir);
if (gpio_num_dir == NULL)
break;
if ((gpio_num_dir->d_type != DT_LNK))
continue;
if (strncmp (gpio_num_dir->d_name, "gpio", 4) != 0)
continue;
/* read 'value' */
snprintf (filepath, PATH_MAX, "/sys/class/gpio/%s/value", gpio_num_dir->d_name);
fd = fopen (filepath, "r");
if (fd == NULL)
continue;
/* read 'direction' */
snprintf (filepath, PATH_MAX, "/sys/class/gpio/%s/direction", gpio_num_dir->d_name);
fp = fopen (filepath, "r");
if (fp == NULL)
{
fclose (fd);
continue;
}
fgets (fileline1, 5, fd);
fgets (fileline2, 5, fp);
fileline2 [strlen(fileline2)-1] = 0;
gpio_num_obj = json_pack ("{s:i, s:i, s:s}",
"gpio", atoi ((gpio_num_dir->d_name) + 4),
"value", atoi (fileline1),
"direction", fileline2);
json_array_append (gpio_array_obj, gpio_num_obj);
json_decref (gpio_num_obj);
fclose (fd);
fclose (fp);
}
json_object_set_new (gpio_obj, "Revision", json_string (board_revision));
json_object_set (gpio_obj, "GPIOState", gpio_array_obj);
if (gpio_obj == NULL)
{
print_log (LOG_ERR, "(%p) (cmd_GetGPIO) can't prepare valid JSON object\n", wsi);
json_decref (gpio_array_obj);
json_decref (gpio_obj);
return send_error (buffer, "Can't prepare valid JSON object");
}
gpio_str = json_dumps (gpio_obj, 0);
if (gpio_str == NULL)
{
print_log (LOG_ERR, "(%p) (cmd_GetGPIO) can't prepare valid JSON object\n", wsi);
json_decref (gpio_array_obj);
json_decref (gpio_obj);
return send_error (buffer, "Can't prepare valid JSON object");
}
gpio_len = strlen (gpio_str);
memcpy (buffer, gpio_str, gpio_len);
if (opt_show_json_obj)
print_log (LOG_INFO, "(%p) (cmd_GetGPIO) %s\n", wsi, gpio_str);
json_decref (gpio_array_obj);
json_decref (gpio_obj);
free (gpio_str);
return gpio_len;
}
/*
* cmd_GetTempSensors()
*
* JSON Object
* ===========
*
* {
* "TempSensors": [
* {
* "type" : "DS18B20",
* "id" : "28-000002f218f8",
* "temp" : 23.250,
* "crc" : "YES"
* },
* {
* "type" : "DS18S20",
* "id" : "10-000002f1f367",
* "temp" : 23.562,
* "crc" : "NO"
* },
* .
* .
* ]
* }
*/
unsigned int
cmd_GetTempSensors (struct libwebsocket *wsi, unsigned char *buffer)
{
json_t *tempsensors_obj;
json_t *tempsensors_array_obj;
FILE *fd, *fp;
DIR *w1_master_dir;
struct dirent *w1_device_dir;
char filepath [PATH_MAX];
char fileline [100];
int num_line;
char *tempsensors_str;
int tempsensors_len;
print_log (LOG_INFO, "(%p) (cmd_GetTempSensors) processing request\n", wsi);
/* don't scan 1-wire bus if daemon has limited privileges */
if (geteuid() == 0)
{
/* remove all sensors */
fd = fopen("/sys/bus/w1/devices/w1_bus_master1/w1_master_slaves", "r");
if (!fd)
{
print_log (LOG_ERR, "(%p) (cmd_GetTempSensors) unable to read the list of registered 1-wire sensors\n", wsi);
return send_error (buffer, "Unable to read the list of registered 1-wire sensors");
}
while (1)
{
if (fgets (fileline, 20, fd) == NULL)
break;
fp = fopen("/sys/bus/w1/devices/w1_bus_master1/w1_master_remove", "w");
if (!fp)
{
print_log (LOG_ERR, "(%p) (cmd_GetTempSensors) unable to remove previously registered 1-wire sensor\n", wsi);
fclose (fd);
return send_error (buffer, "Unable to remove previously registered 1-wire sensor");
}
fprintf (fp, "%s", fileline);
fclose (fp);
}
fclose (fd);
/* rescan 1-wire bus */
fd = fopen("/sys/bus/w1/devices/w1_bus_master1/w1_master_search", "w");
if (!fd)
{
print_log (LOG_ERR, "(%p) (cmd_GetTempSensors) unable to rescan 1-wire sensors\n", wsi);
return send_error (buffer, "Unable to rescan 1-wire sensors");
}
fprintf (fd, "1");
fclose (fd);
/* we have to wait till all sensors will be available on bus */
sleep (1);
}
/* read all sensors */
w1_master_dir = opendir ("/sys/devices/w1_bus_master1");
if (w1_master_dir == NULL)
{
print_log (LOG_ERR, "(%p) (cmd_GetTempSensors) can't open 'w1_bus_master1' directory\n", wsi);
return send_error (buffer, "Can't open 'w1_bus_master1' directory");
}
tempsensors_obj = json_object();
tempsensors_array_obj = json_array();
while(1)
{
json_t *tempsensor_obj;
w1_device_dir = readdir (w1_master_dir);
if (w1_device_dir == NULL)
break;
if ((w1_device_dir->d_type != DT_DIR))
continue;
if ((strncmp (w1_device_dir->d_name, DS18B20_CODE, 2) != 0) &&
(strncmp (w1_device_dir->d_name, DS1820_CODE, 2) != 0))
continue;
snprintf (filepath, PATH_MAX, "/sys/devices/w1_bus_master1/%s/w1_slave", w1_device_dir->d_name);
fd = fopen (filepath, "r");
if (fd == NULL)
continue;
num_line = 1;
tempsensor_obj = json_object();
while (1)
{
if (fgets (fileline, 100, fd) == NULL)
break;
if (strncmp (w1_device_dir->d_name, DS18B20_CODE, 2) == 0)
json_object_set_new (tempsensor_obj, "type", json_string ("Dallas DS18B20"));
if (strncmp (w1_device_dir->d_name, DS1820_CODE, 2) == 0)
json_object_set_new (tempsensor_obj, "type", json_string ("Dallas DS1820"));
if (num_line == 1)
{
json_object_set_new (tempsensor_obj, "id", json_string (w1_device_dir->d_name));
fileline [strlen(fileline)-1] = 0;
json_object_set_new (tempsensor_obj, "crc", json_string (&fileline[36]));
}
else if (num_line == 2)
{
json_object_set_new (tempsensor_obj, "temp", json_real ((atof (&fileline[29])) / 1000));
}
num_line++;
}
json_array_append (tempsensors_array_obj, tempsensor_obj);
json_decref (tempsensor_obj);
fclose (fd);
}
json_object_set (tempsensors_obj, "TempSensors", tempsensors_array_obj);
if (tempsensors_obj == NULL)
{
print_log (LOG_ERR, "(%p) (cmd_GetTempSensors) can't prepare valid JSON object\n", wsi);
json_decref (tempsensors_array_obj);
json_decref (tempsensors_obj);
return send_error (buffer, "Can't prepare valid JSON object");
}
tempsensors_str = json_dumps (tempsensors_obj, 0);
if (tempsensors_str == NULL)
{
print_log (LOG_ERR, "(%p) (cmd_GetTempSensors) can't prepare valid JSON object\n", wsi);
json_decref (tempsensors_array_obj);
json_decref (tempsensors_obj);
return send_error (buffer, "Can't prepare valid JSON object");
}
tempsensors_len = strlen (tempsensors_str);
memcpy (buffer, tempsensors_str, tempsensors_len);
if (opt_show_json_obj)
print_log (LOG_INFO, "(%p) (cmd_GetTempSensors) %s\n", wsi, tempsensors_str);
json_decref (tempsensors_array_obj);
json_decref (tempsensors_obj);
free (tempsensors_str);
return tempsensors_len;
}
/*
* cmd_GetProcesses()
*
* JSON Object
* ===========
*
* {
* "Processes": [
* {
* "pid" : 1,
* "user" : "root",
* "name" : "init",
* "state": "S (sleeping)"
* },
* {
* "pid" : 1934,
* "user" : "root",
* "name" : "rsyslogd",
* "state": "S (sleeping)"
* },
* .
* .
* ]
* }
*/
unsigned int
cmd_GetProcesses (struct libwebsocket *wsi, unsigned char *buffer)
{
json_t *proc_obj;
json_t *proc_array_obj;
FILE *proc_pid_status;
DIR *proc_dir;
struct dirent *proc_pid_dir;
char filepath [PATH_MAX];
char fileline [1000];
char *ptr;
char *proc_str;
int proc_len;
print_log (LOG_INFO, "(%p) (cmd_GetProcesses) processing request\n", wsi);
proc_dir = opendir ("/proc");
if (proc_dir == NULL)
{
print_log (LOG_ERR, "(%p) (cmd_GetProcesses) unable to read the list of processes\n", wsi);
return send_error (buffer, "Unable to read the list of processes");
}
proc_obj = json_object();
proc_array_obj = json_array();
while(1)
{
json_t *proc_entry_obj;
proc_pid_dir = readdir (proc_dir);
if (proc_pid_dir == NULL)
break;
if ((proc_pid_dir->d_type != DT_DIR) || (!isdigit((unsigned char) proc_pid_dir->d_name[0])))
continue;
snprintf(filepath, PATH_MAX, "/proc/%s/status", proc_pid_dir->d_name);
proc_pid_status = fopen(filepath, "r");
if (proc_pid_status == NULL)
continue;
proc_entry_obj = json_object();
json_object_set_new (proc_entry_obj, "pid", json_integer (atoi (proc_pid_dir->d_name)));
while (1)
{
if (fgets (fileline, 1000, proc_pid_status) == NULL)
break;
if (strncmp(fileline, "Name:", 5) == 0)
{
fileline [strlen(fileline)-1] = 0;
for (ptr = fileline + 5; *ptr != '\0' && isspace((unsigned char) *ptr);)
ptr++;
json_object_set_new (proc_entry_obj, "name", json_string (ptr));
}
if (strncmp(fileline, "Uid:", 4) == 0)
{
struct passwd *pw;
if ((pw = getpwuid ((unsigned int) strtol(fileline + 4, NULL, 10))))
json_object_set_new (proc_entry_obj, "user", json_string (pw->pw_name));
}
if (strncmp(fileline, "State:", 6) == 0)
{
fileline [strlen(fileline)-1] = 0;
for (ptr = fileline + 6; *ptr != '\0' && isspace((unsigned char) *ptr);)
ptr++;
json_object_set_new (proc_entry_obj, "state", json_string (ptr));
}
}
json_array_append (proc_array_obj, proc_entry_obj);
json_decref (proc_entry_obj);
fclose (proc_pid_status);
}
json_object_set (proc_obj, "Processes", proc_array_obj);
if (proc_obj == NULL)
{
print_log (LOG_ERR, "(%p) (cmd_Processes) can't prepare valid JSON object\n", wsi);
json_decref (proc_array_obj);
json_decref (proc_obj);
return send_error (buffer, "Can't prepare valid JSON object");
}
proc_str = json_dumps (proc_obj, 0);
if (proc_str == NULL)
{
print_log (LOG_ERR, "(%p) (cmd_GetProcesses) can't prepare valid JSON object\n", wsi);
json_decref (proc_array_obj);
json_decref (proc_obj);
return send_error (buffer, "Can't prepare valid JSON object");
}
proc_len = strlen (proc_str);
memcpy (buffer, proc_str, proc_len);
if (opt_show_json_obj)
print_log (LOG_INFO, "(%p) (cmd_GetProcesses) %s\n", wsi, proc_str);
json_decref (proc_array_obj);
json_decref (proc_obj);
free (proc_str);
return proc_len;
}
/*
* cmd_GetStatistics()
*
* JSON Object
* ===========
*
* {
* "Statistics": {
* "kernel": "3.2.27+",
* "uptime": "1h 16m 39s",
* "serial": "00000000b62b4ab1",
* "mac_addr": "a1:eb:27:13:aa:b3",
* "used_space": 2.21,
* "free_space": 7.23,
* "ram_usage": 51,
* "swap_usage": 24,
* "cpu_load": "0.00 0.01 0.05",
* "cpu_temp": 44,
* "cpu_usage": 23
* }
* }
*
*/
bool eth_filter(const char *name)
{
if (strcmp(name, "eth0") == 0)
return true;
return false;
}
bool fs_filter(const char *name)
{
if (strcmp(name, "/") == 0)
return true;
return false;
}
unsigned int
cmd_GetStatistics (struct libwebsocket *wsi, unsigned char *buffer)
{
json_t *stat_obj;
char *stat_str;
int stat_len;
struct devman_ctx *dctx;
char *kernel, *uptime, *serial, *mac_addr, *cpu_load;
int ram_usage, swap_usage, cpu_temp, cpu_usage;
double used_space, free_space;
uint64_t sused, sfree;
char **arr;
int i, n;
print_log (LOG_INFO, "(%p) (cmd_GetStatistics) processing request\n", wsi);
dctx = devman_ctx_init();
if (dctx == NULL)
return 0;
kernel = get_kernel_version(dctx);
uptime = get_uptime_str(dctx);
serial = get_rpi_serial();
n = get_netdevices(&arr, eth_filter);
mac_addr = NULL;
sscanf(arr[0], "%*[a-z0-9:] %ms", &mac_addr);
FREE_ARRAY_ELEMENTS(arr, i, n);
n = get_df(&arr, fs_filter);
sscanf(arr[0], "%*s %*s %"SCNu64" %"SCNu64, &sused, &sfree);
used_space = sused / 1024.0 / 1024.0;
free_space = sfree / 1024.0 / 1024.0;
FREE_ARRAY_ELEMENTS(arr, i, n);
ram_usage = total_mem_usage(dctx, false);
swap_usage = total_mem_usage(dctx, true);
cpu_load = get_cpuload_str(dctx);
cpu_temp = get_rpi_cpu_temp();
cpu_usage = total_cpu_usage();
stat_obj = json_pack ("{s:{s:s, s:s, s:s, s:s, s:f, s:f, s:i, s:i, s:s, s:i, s:i}}",
"Statistics",
"kernel", kernel,
"uptime", uptime,
"serial", serial,
"mac_addr", mac_addr,
"used_space", used_space,
"free_space", free_space,
"ram_usage", ram_usage,
"swap_usage", swap_usage,
"cpu_load", cpu_load,
"cpu_temp", cpu_temp,
"cpu_usage", cpu_usage);
if (stat_obj == NULL)
{
print_log (LOG_ERR, "(%p) (cmd_GetStatistics) can't prepare valid JSON object\n", wsi);
return send_error (buffer, "Can't prepare valid JSON object");
}
stat_str = json_dumps (stat_obj, 0);
if (stat_str == NULL)
{
print_log (LOG_ERR, "(%p) (cmd_GetStatistics) can't prepare valid JSON object\n", wsi);
json_decref (stat_obj);
return send_error (buffer, "Can't prepare valid JSON object");
}
stat_len = strlen (stat_str);
memcpy (buffer, stat_str, stat_len);
if (opt_show_json_obj)
print_log (LOG_INFO, "(%p) (cmd_GetStatistics) %s\n", wsi, stat_str);
free (stat_str);
json_decref (stat_obj);
free(kernel);
free(uptime);
free(serial);
free(mac_addr);
devman_ctx_free(dctx);
return stat_len;
}
/*
* cmd_SendIR()
*/
unsigned int
cmd_SendIR (struct libwebsocket *wsi, unsigned char *buffer, char *args)
{
char *cmd;
int ret;
print_log (LOG_INFO, "(%p) (cmd_SendIR) processing request\n", wsi);
ret = asprintf (&cmd, "irsend SEND_ONCE %s", args);
if (ret < 0)
{
print_log (LOG_ERR, "(%p) (cmd_SendIR) can't prepare LIRC command\n", wsi);
return send_error (buffer, "Can't prepare LIRC command");
}
/*
* Invoking system() function is temporary solution - we'll switch soon to
* liblirc_client and lirc_send_one() - which will be available in next lirc
* release.
*/
ret = system (cmd);
if (ret != 0)
{
print_log (LOG_ERR, "(%p) (cmd_SendIR) can't send signal\n", wsi);
free (cmd);
return send_error (buffer, "Can't send signal - please check server's log");
}
free (cmd);
return 0;
}
/*
* cmd_SetGPIO()
*/
unsigned int
cmd_SetGPIO (struct libwebsocket *wsi, unsigned char *buffer, char *args)
{
FILE *fd;
char filepath [PATH_MAX];
char *gpio_num;
char *gpio_act;
print_log (LOG_INFO, "(%p) (cmd_SetGPIO) processing request\n", wsi);
/* TODO - strcpy? */
gpio_num = strtok (args, " ");
gpio_act = strtok (NULL, " ");
if ((strcmp(gpio_act, "1") == 0) || (strcmp(gpio_act, "0") == 0))
{
snprintf (filepath, PATH_MAX, "/sys/class/gpio/gpio%s/value", gpio_num);
fd = fopen(filepath, "w");
if (!fd)
{
print_log (LOG_ERR, "(%p) (cmd_SetGPIO) Unable to change GPIO value\n", wsi);
return send_error (buffer, "Unable to change GPIO value");
}
fprintf (fd, "%s", gpio_act);
fclose (fd);
}
else if ((strcmp(gpio_act, "in") == 0) || (strcmp(gpio_act, "out") == 0))
{
snprintf (filepath, PATH_MAX, "/sys/class/gpio/gpio%s/direction", gpio_num);
fd = fopen(filepath, "w");
if (!fd)
{
print_log (LOG_ERR, "(%p) (cmd_SetGPIO) Unable to change GPIO direction\n", wsi);
return send_error (buffer, "Unable to change GPIO direction");
}
fprintf (fd, "%s", gpio_act);
fclose (fd);
}
else
{
print_log (LOG_ERR, "(%p) (cmd_SetGPIO) Unsupported value - please report a bug\n", wsi);
return send_error (buffer, "Unsupported value - please report a bug");
}
return cmd_GetGPIO (wsi, buffer);
}
/*
* cmd_KillProcess()
*/
unsigned int
cmd_KillProcess (struct libwebsocket *wsi, unsigned char *buffer, char *pid_str)
{
unsigned int pid;
print_log (LOG_INFO, "(%p) (cmd_KillProcess) processing request\n", wsi);
if (pid_str)
{
pid = atoi (pid_str);
if (pid)
{
gint ret;
ret = kill (pid, SIGKILL);
if (ret < 0)
goto error;
print_log (LOG_INFO, "(%p) (cmd_KillProcess) send SIGKILL to PID %d\n", wsi, (int) pid);
}
else
{
goto error;
}
}
else
{
goto error;
}
return cmd_GetProcesses (wsi, buffer);
error:
print_log (LOG_ERR, "(%p) (cmd_KillProcess) Can't kill selected process\n", wsi);
return send_error (buffer, "Can't kill selected process");
}
/*
* parse_json()
*/
unsigned int
parse_json (struct libwebsocket *wsi,
unsigned char *data,
unsigned char *buffer)
{
json_t *root;
json_error_t error;
char *cmd_str, *args_str;
int result;
unsigned int len = 0;
root = json_loads ((char*) data, 0, &error);
if(!root)
{
print_log (LOG_ERR, "(%p) (cmd_parser) parser error on line %d: %s\n", wsi, error.line, error.text);
return send_error (buffer, "Could not parse command");
}
result = json_unpack (root, "{s:{s:s, s:s}}", "RunCommand", "cmd", &cmd_str, "args", &args_str);
if (result < 0)
{
print_log (LOG_ERR, "(%p) (cmd_parser) not valid JSON data\n", wsi);
json_decref (root);
return send_error (buffer, "Could not parse command - not valid JSON data");
}
if (strcmp(cmd_str, "GetGPIO") == 0)
len = cmd_GetGPIO (wsi, buffer);
else if (strcmp(cmd_str, "GetTempSensors") == 0)
len = cmd_GetTempSensors (wsi, buffer);
else if (strcmp(cmd_str, "GetProcesses") == 0)