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ssmqtt.c
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ssmqtt.c
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// MQTT handling for Solar System
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <popt.h>
#include <time.h>
#include <sys/time.h>
#include <stdlib.h>
#include <ctype.h>
#include <err.h>
#include <sys/socket.h>
#include <sys/signal.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <pthread.h>
#include <semaphore.h>
#include "AJL/ajl.h"
#include "sscert.h"
#include "mqttmsg.h"
#include "ssmqtt.h"
#define MAX_SETTING 1400 // Limit size of settings - allow for header and AES padding even
extern const char *cakey;
extern const char *cacert;
extern const char *mqttkey;
extern const char *mqttcert;
extern int sqldebug;
extern int dump;
extern int mqttdump;
SSL_CTX *ctx = NULL;
static void *
insecureserver (void *arg)
{ // Non TLS server that just sends new setting to get secure connection
int sock = -1;
device_t device = "";
char address[40] = "";
{ // Get passed settings
j_t j = arg;
sock = atoi (j_get (j, "socket") ? : "");
if (!sock)
errx (1, "server socket not set");
strncpy (address, j_get (j, "address") ? : "", sizeof (address));
j_delete (&j);
}
warnx ("Connect from %s (insecure)", address);
uint8_t rx[10000];
uint8_t tx[10000];
int pos = 0,
txp = 0;
const char *fail = NULL;
uint16_t keepalive = 0;
time_t katimeout = time (0) + 10;
int nfds = sock;
nfds++;
while (!fail)
{
time_t now = time (0);
if (now >= katimeout)
{
fail = "Timeout";
break;
}
fd_set r;
FD_ZERO (&r);
FD_SET (sock, &r);
{
struct timeval to = { pos ? 1 : katimeout - now, 0 };
select (nfds, &r, NULL, NULL, &to);
}
if (!txp)
{
if (FD_ISSET (sock, &r))
{ // Next block
int len = read (sock, rx + pos, sizeof (rx) - pos);
if (len <= 0)
{
fail = "Closed";
break;
}
pos += len;
}
if (fail)
break;
if (pos < 2)
continue;
int i,
l = 0; // Len is low byte first
for (i = 1; i < pos && (rx[i] & 0x80); i++)
l |= (rx[i] & 0x7F) << ((i - 1) * 7);
l |= (rx[i] & 0x7F) << ((i - 1) * 7);
i++;
if (i > pos || (i == pos && (rx[i - 1] & 0x80)))
continue; // Need more data
katimeout = time (0) + keepalive * 3 / 2;
if (dump)
{
fprintf (stderr, "[insecure]%s<", device);
for (int q = 0; q < i + l; q++)
fprintf (stderr, " %02X", rx[q]);
fprintf (stderr, "\n");
}
uint8_t *data = rx + i,
*end = rx + i + l;
// Process message
const char *process (void)
{
switch (*rx >> 4)
{
case 1: // Connect
{
if (data + 6 > end || data[0] || data[1] != 4 || memcmp (data + 2, "MQTT", 4))
return "Not MQTT format";
data += 6;
if (data + 1 > end || *data != 4)
return "Bad MQTT version";
data++;
if (data + 1 > end)
return "Too short";
data++; // Flags (we don't care)
if (data + 2 > end)
return "Too short";
keepalive = (data[0] << 8) + data[1];
katimeout = time (0) + keepalive * 3 / 2;
data += 2;
// Client ID
int clientlen = (data[0] << 8) + data[1];
data += 2;
char *client = (char *) data;
data += clientlen;
// We don't really care about these
// Will Topic
// Will Message
// Username
// Password
// Send connect ack
tx[txp++] = 0x20; // connack
tx[txp++] = 2;
tx[txp++] = 0; // no session
tx[txp++] = 0; // clean
if (clientlen != 15 || (strncmp (client, "SS-", 3) && strncmp (client, "SS:", 3)))
return "Bad client ID";
// Send new setting
char *topic = NULL;
if (asprintf (&topic, "setting/SS/%.12s", client + 3) <= 0)
errx (1, "malloc");
j_t j = j_create ();
j_t m = j_store_object (j, "mqtt");
j_store_string (m, "host", CONFIG_MQTT_HOSTNAME);
j_store_string (m, "cert", cacert);
txp += mqtt_encode (tx + txp, sizeof (tx) - txp, topic, j);
j_delete (&j);
free (topic);
}
break;
case 3: // Publish
break;
case 4: // Puback
break;
case 5: // Pubrec
break;
case 6: // pubpel
break;
case 7: // pubcomp
break;
case 8: // sub
{ // ACK the subscribe
if (data + 2 > end)
return "Too short";
unsigned short id = (data[0] << 8) + data[1];
data += 2;
// Ack
tx[txp++] = 0x90;
txp += 2; // len
tx[txp++] = (id >> 8);
tx[txp++] = id;
while (data + 2 <= end)
{
int l = (data[0] << 8) + data[1];
data += 2;
data += l;
uint8_t qos = *data++;
tx[txp++] = qos;
}
tx[1] = 0x80 + ((txp - 3) & 0x7f); // len
tx[2] = ((txp - 3) >> 7);
}
break;
case 10: // unsub
return "Not expecting unsubscribe";
break;
case 12: // pingreq
{
tx[txp++] = 0xD0;
tx[txp++] = 0;
}
break;
case 14: // disconnect
return "*Clean disconnect";
default:
warnx ("Message code %d", *rx >> 4);
return "Unexpected MQTT message code";
}
return NULL;
}
if (!fail)
fail = process ();
if (i + l < pos)
memmove (rx, rx + i + l, pos - i - l); // more
pos -= i + l;
}
if (!fail && txp)
{ // Send data
if (dump)
{
fprintf (stderr, "[insecure]%s>", device);
for (int i = 0; i < txp; i++)
fprintf (stderr, " %02X", tx[i]);
fprintf (stderr, "\n");
}
if (write (sock, tx, txp) <= 0)
fail = "tx fail";
txp = 0;
}
}
if (fail)
warnx ("Disconnect from %s (insecure): %s", address, fail);
close (sock);
return NULL;
}
static void *
server (void *arg)
{
int sock = -1;
device_t device = "";
char address[40] = "";
{ // Get passed settings
j_t j = arg;
sock = atoi (j_get (j, "socket") ? : "");
if (!sock)
errx (1, "server socket not set");
strncpy (address, j_get (j, "address") ? : "", sizeof (address));
j_delete (&j);
}
warnx ("Connect from %s", address);
int relaysock = -1; // The socket we listen to for tx messages to other side
slot_t us = slot_create (&relaysock, address);
if (!us)
{
close (sock);
return "Failed";
}
// TLS
SSL *ssl = SSL_new (ctx);
if (!ssl)
{
close (sock);
errx (1, "Cannot make SSL");
}
if (!SSL_set_fd (ssl, sock) || SSL_accept (ssl) != 1)
{
close (sock);
long e;
while ((e = ERR_get_error ()))
{
char temp[1000];
ERR_error_string_n (e, temp, sizeof (temp));
warnx ("%s", temp);
}
SSL_shutdown (ssl);
SSL_free (ssl);
warnx ("Failed SSL from %s", address);
slot_destroy (us);
return NULL;
}
X509 *cert = SSL_get_peer_certificate (ssl);
if (cert)
{
X509_NAME *subject = X509_get_subject_name (cert);
if (subject)
{
device_t id;
if (X509_NAME_get_text_by_NID (subject, NID_commonName, id, sizeof (id)) == sizeof (id) - 1)
strcpy (device, id);
}
X509_free (cert);
}
void addq (j_t * jp)
{
j_t j = *jp;
if (*device == '-')
j_int (j_path (j, "_meta.local"), us);
else
{
j_t meta = j_store_object (j, "_meta");
j_store_int (meta, "id", us);
if (*device)
j_store_string (meta, "device", device);
j_store_string (meta, "address", address);
mqtt_topic (j, NULL, 0);
}
mqtt_qin (jp);
}
uint8_t rx[10000];
uint8_t tx[10000];
int pos = 0,
txp = 0;
const char *fail = NULL;
uint16_t keepalive = 0;
time_t katimeout = time (0) + 10;
int nfds = sock;
if (relaysock > sock)
nfds = relaysock;
nfds++;
while (!fail)
{
time_t now = time (0);
if (now >= katimeout)
{
fail = "Timeout";
break;
}
fd_set r;
FD_ZERO (&r);
FD_SET (sock, &r);
if (!SSL_has_pending (ssl))
{
FD_SET (relaysock, &r);
struct timeval to = { pos ? 1 : katimeout - now, 0 }; // The 1 is a catch all for possible multiple messages, should not happen
select (nfds, &r, NULL, NULL, &to);
if (FD_ISSET (relaysock, &r))
{
txp = recv (relaysock, tx, sizeof (tx), 0);
if (txp <= 0)
break; // Closed connection
}
}
if (!txp && FD_ISSET (sock, &r))
{
{ // Next block
int len = SSL_read (ssl, rx + pos, sizeof (rx) - pos);
if (len <= 0)
{
fail = "Closed";
break;
}
pos += len;
}
if (fail)
break;
if (pos < 2)
continue;
int i,
l = 0; // Len is low byte first
for (i = 1; i < pos && (rx[i] & 0x80); i++)
l |= (rx[i] & 0x7F) << ((i - 1) * 7);
l |= (rx[i] & 0x7F) << ((i - 1) * 7);
i++;
if (i > pos || (i == pos && (rx[i - 1] & 0x80)))
continue; // Need more data
katimeout = time (0) + keepalive * 3 / 2;
if (dump)
{
fprintf (stderr, "%s<", device);
for (int q = 0; q < i + l; q++)
fprintf (stderr, " %02X", rx[q]);
fprintf (stderr, "\n");
}
uint8_t *data = rx + i,
*end = rx + i + l;
// Process message
const char *process (void)
{
switch (*rx >> 4)
{
case 1: // Connect
{
if (data + 6 > end || data[0] || data[1] != 4 || memcmp (data + 2, "MQTT", 4))
return "Not MQTT format";
data += 6;
if (data + 1 > end || *data != 4)
return "Bad MQTT version";
data++;
if (data + 1 > end)
return "Too short";
data++; // Flags (we don't care)
if (data + 2 > end)
return "Too short";
keepalive = (data[0] << 8) + data[1];
katimeout = time (0) + keepalive * 3 / 2;
data += 2;
// We don't really care about these
// Client ID
// Will Topic
// Will Message
// Username
// Password
// Send connect ack
tx[txp++] = 0x20; // connack
tx[txp++] = 2;
tx[txp++] = 0; // no session
tx[txp++] = 0; // clean
}
break;
case 3: // Publish
{
uint8_t qos = (*rx >> 1) & 3;
j_t j = mqtt_decode (rx, i + l);
if (j)
{
if (qos)
{
int id = atoi (j_get (j, "_meta.id") ? : "");
tx[txp++] = (qos == 1 ? 0x40 : 0x50); // puback/pubrec
tx[txp++] = 2;
tx[txp++] = (id >> 8);
tx[txp++] = id;
}
addq (&j);
}
}
break;
case 4: // Puback
break;
case 5: // Pubrec
break;
case 6: // pubpel
{
if (data + 2 > end)
return "Too short";
tx[txp++] = 0x70; // pubcomp
tx[txp++] = 2;
tx[txp++] = data[0];
tx[txp++] = data[1];
}
break;
case 7: // pubcomp
break;
case 8: // sub
{
if (data + 2 > end)
return "Too short";
unsigned short id = (data[0] << 8) + data[1];
data += 2;
// Ack
tx[txp++] = 0x90;
txp += 2; // len
tx[txp++] = (id >> 8);
tx[txp++] = id;
j_t j = j_create ();
j_t s = j_array (j_path (j, "_meta.subscribe"));
while (data + 2 <= end)
{
int l = (data[0] << 8) + data[1];
data += 2;
if (data + l <= end)
j_append_stringn (s, (char *) data, l);
data += l;
uint8_t qos = *data++;
tx[txp++] = qos;
}
addq (&j);
tx[1] = 0x80 + ((txp - 3) & 0x7f); // len
tx[2] = ((txp - 3) >> 7);
}
break;
case 10: // unsub
{
if (data + 2 > end)
return "Too short";
unsigned short id = (data[0] << 8) + data[1];
data += 2;
j_t j = j_create ();
j_t s = j_array (j_path (j, "_meta.unsubscribe"));
while (data + 2 <= end)
{
int l = (data[0] << 8) + data[1];
data += 2;
if (data + l <= end)
j_append_stringn (s, (char *) data, l);
data += l;
}
addq (&j);
// Ack
tx[txp++] = 0xB0;
tx[txp++] = 2;
tx[txp++] = (id >> 8);
tx[txp++] = id;
}
break;
case 12: // pingreq
{
tx[txp++] = 0xD0;
tx[txp++] = 0;
}
break;
case 14: // disconnect
return "*Clean disconnect";
default:
return "Unexpected MQTT message code";
}
return NULL;
}
if (!fail)
fail = process ();
if (i + l < pos)
memmove (rx, rx + i + l, pos - i - l); // more - but we don't expect that as TLS packets should be one message
pos -= i + l;
}
if (!fail && txp)
{ // Send data
if (dump)
{
fprintf (stderr, "%s>", device);
for (int i = 0; i < txp; i++)
fprintf (stderr, " %02X", tx[i]);
fprintf (stderr, "\n");
}
SSL_write (ssl, tx, txp);
txp = 0;
}
}
if (*device != '-')
{ // Down message if it sent and up and not internal
j_t j = j_create ();
addq (&j);
}
slot_t linked = slot_linked (us);
if (linked)
slot_close (linked); // tell linked to close (e.g. fobcommand task)
slot_destroy (us);
if (fail && *fail != '*')
warnx ("Fail from %s (%s)", address, fail);
else
warnx ("Closed from %s", address);
SSL_shutdown (ssl);
SSL_free (ssl);
close (sock);
return NULL;
}
static void *
insecurelistener (void *arg)
{ // Listen thread
arg = arg;
int slisten = -1;
struct addrinfo base = { ai_flags: AI_PASSIVE, ai_family:
#ifdef CONFIG_MQTT_IPV4
AF_INET
#else
AF_UNSPEC
#endif
, ai_socktype:SOCK_STREAM
};
struct addrinfo *a = 0,
*p;
if (getaddrinfo (CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_INSECURE_PORT, &base, &a) || !a)
errx (1, "Failed to find address for %s:%s", CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_INSECURE_PORT);
for (p = a; p; p = p->ai_next)
{
slisten = socket (p->ai_family, p->ai_socktype, p->ai_protocol);
if (slisten < 0)
continue;
int on = 1;
setsockopt (slisten, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on));
if (bind (slisten, p->ai_addr, p->ai_addrlen) || listen (slisten, 10))
{ // failed to connect
close (slisten);
slisten = -1;
continue;
}
break;
}
freeaddrinfo (a);
if (slisten < 0)
err (1, "Cannot bind local address %s:%s", CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_INSECURE_PORT);
if (sqldebug)
warnx ("Bind %s:%s", CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_INSECURE_PORT);
while (1)
{
struct sockaddr_in6 addr = { 0 };
socklen_t len = sizeof (addr);
int s = accept (slisten, (void *) &addr, &len);
if (s < 0)
{
warn ("Bad accept");
continue;
}
char from[INET6_ADDRSTRLEN + 1] = "";
if (addr.sin6_family == AF_INET)
inet_ntop (addr.sin6_family, &((struct sockaddr_in *) &addr)->sin_addr, from, sizeof (from));
else
inet_ntop (addr.sin6_family, &addr.sin6_addr, from, sizeof (from));
if (!strncmp (from, "::ffff:", 7) && strchr (from, '.'))
memmove (from, from + 7, strlen (from + 7) + 1);
j_t j = j_create ();
j_store_string (j, "address", from);
j_store_int (j, "socket", s);
pthread_t t;
if (pthread_create (&t, NULL, insecureserver, j))
err (1, "Cannot create insecure server thread");
pthread_detach (t);
}
return NULL;
}
static void *
listener (void *arg)
{ // Listen thread
arg = arg;
ctx = SSL_CTX_new (SSLv23_server_method ());
if (!ctx)
errx (1, "CTX fail");
if (*mqttkey)
{
EVP_PKEY *key = der2pkey (mqttkey);
if (SSL_CTX_use_PrivateKey (ctx, key) != 1)
errx (1, "Failed to set private key");
EVP_PKEY_free (key);
}
if (*mqttcert)
{
X509 *cert = der2x509 (mqttcert);
if (SSL_CTX_use_certificate (ctx, cert) != 1)
errx (1, "Failed to set certificate");
X509_free (cert);
}
if (*cacert)
{
X509 *cert = der2x509 (cacert);
if (SSL_CTX_add_client_CA (ctx, cert) != 1)
errx (1, "Failed to set client CA");
X509_STORE *ca = X509_STORE_new ();
X509_STORE_add_cert (ca, cert);
SSL_CTX_set_cert_store (ctx, ca);
X509_free (cert);
SSL_CTX_set_verify (ctx, SSL_VERIFY_PEER, NULL);
}
int slisten = -1;
struct addrinfo base = { ai_flags: AI_PASSIVE, ai_family:
#ifdef CONFIG_MQTT_IPV4
AF_INET
#else
AF_UNSPEC
#endif
, ai_socktype:SOCK_STREAM
};
struct addrinfo *a = 0,
*p;
if (getaddrinfo (CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_PORT, &base, &a) || !a)
errx (1, "Failed to find address for %s:%s", CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_PORT);
for (p = a; p; p = p->ai_next)
{
slisten = socket (p->ai_family, p->ai_socktype, p->ai_protocol);
if (slisten < 0)
continue;
int on = 1;
setsockopt (slisten, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on));
if (bind (slisten, p->ai_addr, p->ai_addrlen) || listen (slisten, 10))
{ // failed to connect
close (slisten);
slisten = -1;
continue;
}
break;
}
freeaddrinfo (a);
if (slisten < 0)
err (1, "Cannot bind local address %s:%s", CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_PORT);
if (sqldebug)
warnx ("Bind %s:%s", CONFIG_MQTT_HOSTNAME, CONFIG_MQTT_PORT);
while (1)
{
struct sockaddr_in6 addr = { 0 };
socklen_t len = sizeof (addr);
int s = accept (slisten, (void *) &addr, &len);
if (s < 0)
{
warn ("Bad accept");
continue;
}
char from[INET6_ADDRSTRLEN + 1] = "";
if (addr.sin6_family == AF_INET)
inet_ntop (addr.sin6_family, &((struct sockaddr_in *) &addr)->sin_addr, from, sizeof (from));
else
inet_ntop (addr.sin6_family, &addr.sin6_addr, from, sizeof (from));
if (!strncmp (from, "::ffff:", 7) && strchr (from, '.'))
memmove (from, from + 7, strlen (from + 7) + 1);
j_t j = j_create ();
j_store_string (j, "address", from);
j_store_int (j, "socket", s);
pthread_t t;
if (pthread_create (&t, NULL, server, j))
err (1, "Cannot create server thread");
pthread_detach (t);
}
return NULL;
}
static pthread_mutex_t rxq_mutex;
static sem_t rxq_sem;
static pthread_mutex_t slot_mutex;
void
mqtt_start (void)
{ // Start MQTT server (not a real MQTT server, just talks MQTT)
OPENSSL_init_ssl (0, NULL);
pthread_mutex_init (&slot_mutex, NULL);
pthread_mutex_init (&rxq_mutex, NULL);
sem_init (&rxq_sem, 0, 0);
{ // Set up listen thread (secure)
pthread_t t;
if (pthread_create (&t, NULL, listener, NULL))
err (1, "Cannot create listener thread");
pthread_detach (t);
}
{ // Set up listen thread (insecure)
pthread_t t;
if (pthread_create (&t, NULL, insecurelistener, NULL))
err (1, "Cannot create listener thread");
pthread_detach (t);
}
}
// Incoming queue
typedef struct rxq_s rxq_t;
struct rxq_s
{
rxq_t *next;
j_t j;
};
static rxq_t *rxq = NULL,
*rxqhead = NULL;
void
mqtt_qin (j_t * jp)
{ // Queue incoming
j_t j = *jp;
rxq_t *q = malloc (sizeof (*q));
q->j = j;
*jp = NULL;
q->next = NULL;
pthread_mutex_lock (&rxq_mutex);
if (rxqhead)
rxqhead->next = q;
else
rxq = q;
rxqhead = q;
sem_post (&rxq_sem);
pthread_mutex_unlock (&rxq_mutex);
}
j_t
incoming (void)
{ // Wait for next rx message
const struct timespec to = { time (0) + 60, 0 };
if (sem_timedwait (&rxq_sem, &to))
return NULL;
pthread_mutex_lock (&rxq_mutex);
rxq_t *q = rxq;
if (q)
{
rxq = q->next;
if (!rxq)
rxqhead = NULL;
}
pthread_mutex_unlock (&rxq_mutex);
if (!q)
return NULL; // Should not happen
j_t j = q->j;
free (q);
if (mqttdump)
{
j_t meta = j_find (j, "_meta");
if (meta)
j_detach (meta);
if (meta)
{
slot_t id = strtoll (j_get (meta, "id") ? : j_get (meta, "local") ? : "", NULL, 10);
if (id)
fprintf (stderr, "%lld", id);
}
fprintf (stderr, "<:");
if (meta)
{
const char *topic = j_get (meta, "topic");
if (topic)
fprintf (stderr, "%s ", topic);
else
{
if ((topic = j_get (meta, "prefix")))
fprintf (stderr, "%s/", topic);
if ((topic = j_get (meta, "target")))
fprintf (stderr, "%s/", topic);
if ((topic = j_get (meta, "suffix")))
fprintf (stderr, "%s", topic);
fprintf (stderr, " ");
}
}
if (j_isobject (j) && !j_len (j) && meta)
{
fprintf (stderr, "*");
j_err (j_write (meta, stderr));
} else
j_err (j_write (j, stderr));
fprintf (stderr, "\n");
if (meta)
j_store_json (j, "_meta", &meta);
}
return j;
}
// Server slot
#define SLOT_MAX 65536
static int slot_count = 0;
struct slots_s
{
slot_t id; // Slot ID
slot_t linked; // Linked ID
int txsock; // Socket for sending data
int rxsock; // Socket for receiving data
};
typedef struct slots_s slots_t;
static slots_t slots[SLOT_MAX] = { };
slot_t
slot_create (int *sockp, const char *address)
{ // Create a slot, and allocated the non blocking linked sockets, returns server socket
static slot_t slot_id = 1; // Next id to allocate
pthread_mutex_lock (&slot_mutex);
if (slot_count >= SLOT_MAX)
{
warnx ("Too many connections");
pthread_mutex_unlock (&slot_mutex);
return 0;
}
slots_t *slot;
while ((slot = &slots[slot_id % SLOT_MAX])->id)
slot_id++; // One has to exist based on slot_count - maybe one day make a free slot linkage
{
int sp[2];
if (socketpair (AF_LOCAL, SOCK_DGRAM, 0, sp) < 0)
err (1, "socketpair");
slot->txsock = sp[0];
slot->rxsock = sp[1];
if (sockp)
*sockp = sp[1];
}
slot->id = slot_id;
slot->linked = 0;
slot_count++;
pthread_mutex_unlock (&slot_mutex);
if (mqttdump)
warnx ("Create %lld, slot count %d, %s", slot_id, slot_count, address);
return slot_id;
}
slot_t
slot_linked (slot_t id)
{ // Return the linked slot (cleared if linked slot has been destroyed)
if (!id)
return 0;
slot_t linked = 0;
slots_t *s = &slots[id % SLOT_MAX];
pthread_mutex_lock (&slot_mutex);
if (s->id == id && (linked = s->linked) && slots[linked % SLOT_MAX].id != linked)
s->linked = linked = 0; // Bad far end
pthread_mutex_unlock (&slot_mutex);
return linked;
}
void
slot_link (slot_t id, slot_t linked)
{ // Link two slots, both show slot_linked as the other
if (!id)
return;
slots_t *s = &slots[id % SLOT_MAX];
pthread_mutex_lock (&slot_mutex);
if (s->linked && slots[s->linked % SLOT_MAX].id && slots[s->linked % SLOT_MAX].linked == id)
slots[s->linked % SLOT_MAX].linked = 0; // Unlink
if (s->id == id)
s->linked = linked;
pthread_mutex_unlock (&slot_mutex);
}
void
slot_close (slot_t id)
{ // Sends the server a zero length message to the server asking it to close and destroy
if (!id)
return;
slots_t *s = &slots[id % SLOT_MAX];
pthread_mutex_lock (&slot_mutex);
if (s->id == id)
send (s->txsock, NULL, 0, 0); // Could, in theory, hang...
pthread_mutex_unlock (&slot_mutex);
if (mqttdump)
warnx ("Close request %lld", id);
}
void
slot_destroy (slot_t id)
{ // Destroy a slot, called by server when closing, handles socket closing, unlinks
if (!id)
return;
slots_t *s = &slots[id % SLOT_MAX];
pthread_mutex_lock (&slot_mutex);
if (s->id == id)
{
slot_t linked = s->linked;
if (slots[linked % SLOT_MAX].id == linked && slots[linked % SLOT_MAX].linked == id)
slots[linked % SLOT_MAX].linked = 0;
s->id = 0;
s->linked = 0;
close (s->txsock);
close (s->rxsock);
s->txsock = -1;
s->rxsock = -1;
slot_count--;
}
pthread_mutex_unlock (&slot_mutex);
if (mqttdump)
warnx ("Destroy %lld, slot count %d", id, slot_count);
}
const char *
slot_send (slot_t id, const char *prefix, const char *deviceid, const char *suffix, j_t * jp)
{
char *topic = NULL;
j_t j = NULL;
if (jp)
{
j = *jp;
*jp = NULL;
}
const char *process (j_t j)
{
if (!topic
&& ((!prefix && !(topic = strdup ("")))
|| (prefix
&& asprintf (&topic, "%s/SS/%s%s%s", prefix, (deviceid && *deviceid) ? deviceid : "*", suffix ? "/" : "",
suffix ? : "") < 0)))
return "malloc";
uint8_t tx[2048]; // Sane limit
unsigned int txp = mqtt_encode (tx, sizeof (tx), topic, j);
pthread_mutex_lock (&slot_mutex);
if (slots[id % SLOT_MAX].id != id)
{
pthread_mutex_unlock (&slot_mutex);
warnx ("Slot Send %lld but slot is %lld", id, slots[id % SLOT_MAX].id);
return slots[id % SLOT_MAX].id ? "Recycled id" : "Closed id";
}
if (send (slots[id % SLOT_MAX].txsock, tx, txp, 0) < 0)
{
pthread_mutex_unlock (&slot_mutex);
return "Failed to send";
}
pthread_mutex_unlock (&slot_mutex);
if (mqttdump)
{
fprintf (stderr, "%lld>:%s ", id, topic);
if (j)
j_err (j_write (j, stderr));
fprintf (stderr, "\n");
}
return NULL;
}
const char *fail = NULL;
#ifdef MAX_SETTING
if (prefix && !strcmp (prefix, "setting"))
{
int len (j_t j)
{
char *t = j_write_str (j);
if (!t)
{
fail = "JSON failed";
return -1;
}
int len = strlen (t);
free (t);
return len;
}