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orvibo_plug.c
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orvibo_plug.c
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/* orvibo - A simple home web server for control of orvibo WiFi plugs
*
* Copyright 2020, Pascal Martin
*
* 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.
*
*
* orvibo_plug.c - Control an Orvibo WiFi plug or switch.
*
* SYNOPSYS:
*
* const char *orvibo_plug_configure (int argc, const char **argv);
*
* Retrieve the configuration and initialize access to the plugs.
* Return the number of configured relay points available.
*
* const char *orvibo_plug_refresh (void);
*
* Re-evaluate the GPIO setup after the configuration changed.
*
* int orvibo_plug_count (void);
*
* Return the number of configured relay points available.
*
* const char *orvibo_plug_name (int point);
*
* Return the name of an orvibo plug.
*
* const char *orvibo_plug_failure (int point);
*
* Return a string describing the failure, or a null pointer if healthy.
*
* int orvibo_plug_commanded (int point);
* time_t orvibo_plug_deadline (int point);
*
* Return the last commanded state, or the command deadline, for
* the specified orvibo plug.
*
* int orvibo_plug_get (int point);
*
* Get the actual state of the plug.
*
* int orvibo_plug_set (int point, int state, int pulse);
*
* Set the specified point to the on (1) or off (0) state for the pulse
* length specified. The pulse length is in seconds. If pulse is 0, the
* plug is maintained to the requested state until a new state is issued.
*
* Return 1 on success, 0 if the plug is not known and -1 on error.
*
* void orvibo_plug_periodic (void);
*
* This function must be called every second. It runs the Orvibo plug
* discovery and ends the expired pulses.
*/
#include <time.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#include "echttp.h"
#include "echttp_json.h"
#include "houselog.h"
#include "houseconfig.h"
#include "orvibo_plug.h"
struct PlugMap {
char name[32];
char description[256];
char macaddress[16];
struct sockaddr_in ipaddress;
time_t detected;
int status;
int commanded;
time_t deadline;
};
static struct PlugMap *Plugs;
static int PlugsCount = 0;
static int PlugsSpace = 0;
static int OrviboSocket = -1;
static struct sockaddr_in OrviboBroadcast;
int orvibo_plug_count (void) {
return PlugsCount;
}
const char *orvibo_plug_name (int point) {
if (point < 0 || point > PlugsCount) return 0;
return Plugs[point].name;
}
int orvibo_plug_commanded (int point) {
if (point < 0 || point > PlugsCount) return 0;
return Plugs[point].commanded;
}
time_t orvibo_plug_deadline (int point) {
if (point < 0 || point > PlugsCount) return 0;
return Plugs[point].deadline;
}
const char *orvibo_plug_failure (int point) {
if (point < 0 || point > PlugsCount) return 0;
if (!Plugs[point].detected) return "silent";
return 0;
}
int orvibo_plug_get (int point) {
if (point < 0 || point > PlugsCount) return 0;
return Plugs[point].status;
}
static void orvibo_plug_socket (void) {
static int OrviboPort = 10000;
OrviboBroadcast.sin_family = AF_INET;
OrviboBroadcast.sin_port = htons(OrviboPort);
OrviboBroadcast.sin_addr.s_addr = INADDR_ANY;
OrviboSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (OrviboSocket < 0) {
houselog_trace (HOUSE_FAILURE, "PLUG",
"cannot open UDP socket: %s", strerror(errno));
exit(1);
}
if (bind(OrviboSocket,
(struct sockaddr *)(&OrviboBroadcast),
sizeof(OrviboBroadcast)) < 0) {
houselog_trace (HOUSE_FAILURE, "PLUG",
"cannot bind to UDP port %d: %s",
OrviboPort, strerror(errno));
exit(1);
}
int value = 1;
if (setsockopt(OrviboSocket, SOL_SOCKET, SO_BROADCAST, &value, sizeof(value)) < 0) {
houselog_trace (HOUSE_FAILURE, "PLUG",
"cannot broadcast: %s", strerror(errno));
exit(1);
}
OrviboBroadcast.sin_addr.s_addr = INADDR_BROADCAST;
houselog_trace (HOUSE_INFO, "PLUG",
"UDP port %d is now open", OrviboPort);
}
static unsigned char hex2bin(char data) {
if (data >= '0' && data <= '9')
return data - '0';
if (data >= 'a' && data <= 'f')
return data - 'a' + 10;
if (data >= 'A' && data <= 'F')
return data - 'A' + 10;
return 0;
}
static char bin2hex (unsigned char d) {
d &= 0x0f;
if (d >= 0 && d <= 9) return '0' + d;
if (d >= 10 && d <= 15) return ('a' - 10) + d;
return '0';
}
static void orvibo_plug_send (const struct sockaddr_in *a, const char *d) {
if (echttp_isdebug())
printf ("Sending %s%s\n", d, (a==&OrviboBroadcast)?" (broadcast)":"");
static unsigned char buffer[1500];
int i;
for (i = 0; d[i] != 0; i += 2) {
buffer[i/2] = hex2bin(d[i]) * 16 + hex2bin(d[i+1]);
}
int sent = sendto (OrviboSocket, buffer, i/2, 0,
(struct sockaddr *)a, sizeof(struct sockaddr_in));
if (sent < 0)
houselog_trace
(HOUSE_FAILURE, "PLUG", "sendto() error: %s", strerror(errno));
}
static void orvibo_plug_sense (void) {
orvibo_plug_send (&OrviboBroadcast, "686400067161");
}
static void orvibo_plug_subscribe (int plug) {
static char subscribe[] =
"6864001e636cFFFFFFFFFFFF202020202020FFFFFFFFFFFF202020202020";
const char *mac = Plugs[plug].macaddress;
int i, j, k;
for (i = 0, j = 12, k = 46; i < 12; i += 2, j += 2, k -= 2) {
subscribe[j] = subscribe[k] = mac[i];
subscribe[j+1] = subscribe[k+1] = mac[i+1];
}
orvibo_plug_send (&(Plugs[plug].ipaddress), subscribe);
}
static void orvibo_plug_control (int plug, int state) {
static char command[] =
"686400176463FFFFFFFFFFFF202020202020000000000F";
const char *mac = Plugs[plug].macaddress;
int i, j;
for (i = 0, j = 12; i < 12; i += 2, j += 2) {
command[j] = mac[i];
command[j+1] = mac[i+1];
}
command[strlen(command)-1] = state?'1':'0';
orvibo_plug_send (&(Plugs[plug].ipaddress), command);
}
int orvibo_plug_set (int point, int state, int pulse) {
const char *namedstate = state?"on":"off";
if (point < 0 || point > PlugsCount) return 0;
if (echttp_isdebug()) {
if (pulse) fprintf (stderr, "set %s to %s at %ld (pulse %ds)\n", Plugs[point].name, namedstate, time(0), pulse);
else fprintf (stderr, "set %s to %s at %ld\n", Plugs[point].name, namedstate, time(0));
}
if (pulse > 0) {
Plugs[point].deadline = time(0) + pulse;
houselog_event ("DEVICE", Plugs[point].name, "SET",
"%s FOR %d SECONDS", namedstate, pulse);
} else {
Plugs[point].deadline = 0;
houselog_event ("DEVICE", Plugs[point].name, "SET", "%s", namedstate);
}
Plugs[point].commanded = state;
// Only send a command if we detected the device on the network.
//
if (Plugs[point].detected) {
orvibo_plug_subscribe (point);
orvibo_plug_control (point, state);
}
}
void orvibo_plug_periodic (time_t now) {
static time_t LastRetry = 0;
static time_t LastSense = 0;
int i;
if (now >= LastSense + 30) {
LastSense = now;
orvibo_plug_sense ();
}
if (now < LastRetry + 5) return;
LastRetry = now;
for (i = 0; i < PlugsCount; ++i) {
// If we did not detect a plug for 3 senses, consider it failed.
if (Plugs[i].detected > 0 && Plugs[i].detected < now - 90) {
houselog_event ("DEVICE", Plugs[i].name, "SILENT",
"MAC ADDRESS %s", Plugs[i].macaddress);
Plugs[i].detected = 0;
}
if (Plugs[i].deadline > 0 && now >= Plugs[i].deadline) {
houselog_event ("DEVICE", Plugs[i].name, "RESET", "END OF PULSE");
Plugs[i].commanded = 0;
Plugs[i].deadline = 0;
}
if (Plugs[i].status != Plugs[i].commanded) {
if (Plugs[i].detected) {
const char *state = Plugs[i].commanded?"on":"off";
houselog_event ("DEVICE", Plugs[i].name, "RETRY", state);
orvibo_plug_subscribe (i);
orvibo_plug_control (i, Plugs[i].commanded);
}
}
}
}
const char *orvibo_plug_refresh (void) {
int i;
int plugs;
for (i = 0; i < PlugsCount; ++i) {
Plugs[i].name[0] = 0;
Plugs[i].macaddress[0] = 0;
Plugs[i].description[0] = 0;
Plugs[i].deadline = 0;
Plugs[i].detected = 0;
}
PlugsCount = 0;
if (houseconfig_size() > 0) {
plugs = houseconfig_array (0, ".orvibo.plugs");
if (plugs < 0) return "cannot find plugs array";
PlugsCount = houseconfig_array_length (plugs);
if (echttp_isdebug()) fprintf (stderr, "found %d plugs\n", PlugsCount);
}
PlugsSpace = PlugsCount + 32;
Plugs = calloc(sizeof(struct PlugMap), PlugsSpace);
if (!Plugs) return "no more memory";
for (i = 0; i < PlugsCount; ++i) {
int plug;
char path[128];
snprintf (path, sizeof(path), "[%d]", i);
plug = houseconfig_object (plugs, path);
if (plug <= 0) continue;
const char *name = houseconfig_string (plug, ".name");
if (name) {
strncpy (Plugs[i].name, name, sizeof(Plugs[i].name));
Plugs[i].name[sizeof(Plugs[i].name)-1] = 0;
}
const char *mac = houseconfig_string (plug, ".address");
if (mac)
strncpy (Plugs[i].macaddress, mac, sizeof(Plugs[i].macaddress));
const char *desc = houseconfig_string (plug, ".description");
if (desc)
snprintf (Plugs[i].description, sizeof(Plugs[i].description), "%s", desc);
if (echttp_isdebug()) fprintf (stderr, "found plug %s, address %s\n", Plugs[i].name, Plugs[i].macaddress);
Plugs[i].commanded = 0;
Plugs[i].deadline = 0;
}
return 0;
}
const char *orvibo_plug_live_config (char *buffer, int size) {
static char pool[65537];
static ParserToken token[1024];
ParserContext context = echttp_json_start (token, 1024, pool, sizeof(pool));
int i;
int root = echttp_json_add_object (context, 0, 0);
int top = echttp_json_add_object (context, root, "orvibo");
int plugs = echttp_json_add_array (context, top, "plugs");
for (i = 0; i < PlugsCount; ++i) {
if (Plugs[i].name[0] == 0 || Plugs[i].macaddress[0] == 0) continue;
int plug = echttp_json_add_object (context, plugs, 0);
echttp_json_add_string (context, plug, "name", Plugs[i].name);
echttp_json_add_string (context, plug, "address", Plugs[i].macaddress);
echttp_json_add_string
(context, plug, "description", Plugs[i].description);
}
return echttp_json_export (context, buffer, size);
}
static int binary_equal (const unsigned char *a, const unsigned char *b, int size) {
while (--size >= 0) {
if (a[size] != b[size]) return 0;
}
return 1;
}
static void importmac (char *mac, const unsigned char *data, int start) {
int i, j;
for (i = start + 5, j = 10; i >= start; --i, j -= 2) {
mac[j] = bin2hex(data[i] >> 4);
mac[j+1] = bin2hex(data[i]);
}
mac[12] = 0;
}
static int orvibo_plug_mac_search (const char *mac) {
int i;
for (i = 0; i < PlugsCount; ++i) {
if (!strcmp(mac, Plugs[i].macaddress)) return i;
}
return -1;
}
static void orvibo_plug_dump (unsigned char *d, int l) {
char buffer[256];
int i, j;
if (l >= sizeof(buffer) / 2) l = (sizeof(buffer) / 2) - 1;
buffer[l*2] = 0;
for (i = l-1, j = (l-1)*2; i >= 0; --i, j -= 2) {
buffer[j] = bin2hex(d[i]>>4);
buffer[j+1] = bin2hex(d[i]);
}
fprintf (stderr, "received: %s\n", buffer);
}
static void orvibo_plug_receive (int fd, int mode) {
static unsigned char discovery[] = {0x68, 0x64, 0, 0x2a, 0x71, 0x61, 0};
static unsigned char command[] = {0x68, 0x64, 0, 0x17, 0x73};
unsigned char data[128];
struct sockaddr_in addr;
int addrlen = sizeof(addr);
int size = recvfrom (OrviboSocket, data, sizeof(data), 0,
(struct sockaddr *)(&addr), &addrlen);
if (size > 0) {
if (echttp_isdebug()) orvibo_plug_dump (data, size);
char mac[16];
int macstart = 0;
int statepos = 0;
int plug;
if (binary_equal(discovery, data, sizeof(discovery))) {
macstart = 7;
statepos = 41;
} else if (binary_equal(command, data, sizeof(command))) {
macstart = 6;
statepos = 22;
} else {
return; // Don't do anything with unused data.
}
importmac (mac, data, macstart);
plug = orvibo_plug_mac_search (mac);
if (plug < 0 && PlugsCount < PlugsSpace) {
if (echttp_isdebug()) fprintf (stderr, "new device %s\n", mac);
plug = PlugsCount++;
snprintf (Plugs[plug].name, sizeof(Plugs[0].name), "plug%d", plug);
snprintf (Plugs[plug].macaddress, sizeof(Plugs[0].macaddress),
"%s", mac);
snprintf (Plugs[plug].description, sizeof(Plugs[0].description),
"autogenerated");
houselog_event ("DEVICE", Plugs[plug].name, "ADDED",
"MAC ADDRESS %s", mac);
Plugs[plug].detected = time(0); // Skip the "DETECTED" event.
}
if (plug >= 0) {
if (!Plugs[plug].detected)
houselog_event ("DEVICE", Plugs[plug].name, "DETECTED",
"MAC ADDRESS %s", mac);
Plugs[plug].detected = time(0);
int status = (data[statepos] == 1);
if (Plugs[plug].status != status) {
houselog_event ("DEVICE", Plugs[plug].name, "CHANGED",
"FROM %s TO %s",
Plugs[plug].status?"on":"off",
status?"on":"off");
Plugs[plug].status = status;
}
memcpy (&(Plugs[plug].ipaddress),
&addr, sizeof(Plugs[plug].ipaddress));
}
}
}
const char *orvibo_plug_initialize (int argc, const char **argv) {
orvibo_plug_socket ();
echttp_listen (OrviboSocket, 1, orvibo_plug_receive, 0);
return orvibo_plug_refresh ();
}