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server.c
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#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdbool.h>
#include <lwip/sockets.h>
#include <unistd.h>
#if defined(ESP_IDF)
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <freertos/queue.h>
#elif defined(ESP_OPEN_RTOS)
#include <FreeRTOS.h>
#include <task.h>
#include <queue.h>
#else
#error "Unknown target platform"
#endif
#include <http-parser/http_parser.h>
#include <cJSON.h>
#include <wolfssl/wolfcrypt/hash.h>
#include <wolfssl/wolfcrypt/coding.h>
#include "constants.h"
#include "base64.h"
#include "crypto.h"
#include "pairing.h"
#include "storage.h"
#include "query_params.h"
#include "json.h"
#include "debug.h"
#include "port.h"
#include <homekit/homekit.h>
#include <homekit/characteristics.h>
#include <homekit/tlv.h>
#define PORT 5556
#ifndef HOMEKIT_MAX_CLIENTS
#define HOMEKIT_MAX_CLIENTS 16
#endif
struct _client_context_t;
typedef struct _client_context_t client_context_t;
#define HOMEKIT_NOTIFY_EVENT(server, event) \
if ((server)->config->on_event) \
(server)->config->on_event(event);
typedef enum {
HOMEKIT_ENDPOINT_UNKNOWN = 0,
HOMEKIT_ENDPOINT_PAIR_SETUP,
HOMEKIT_ENDPOINT_PAIR_VERIFY,
HOMEKIT_ENDPOINT_IDENTIFY,
HOMEKIT_ENDPOINT_GET_ACCESSORIES,
HOMEKIT_ENDPOINT_GET_CHARACTERISTICS,
HOMEKIT_ENDPOINT_UPDATE_CHARACTERISTICS,
HOMEKIT_ENDPOINT_PAIRINGS,
HOMEKIT_ENDPOINT_RESOURCE,
} homekit_endpoint_t;
typedef struct {
Srp *srp;
byte *public_key;
size_t public_key_size;
client_context_t *client;
} pairing_context_t;
typedef struct {
byte *secret;
size_t secret_size;
byte *session_key;
size_t session_key_size;
byte *device_public_key;
size_t device_public_key_size;
byte *accessory_public_key;
size_t accessory_public_key_size;
} pair_verify_context_t;
typedef struct {
char accessory_id[ACCESSORY_ID_SIZE + 1];
ed25519_key accessory_key;
homekit_server_config_t *config;
bool paired;
pairing_context_t *pairing_context;
int listen_fd;
fd_set fds;
int max_fd;
int client_count;
client_context_t *clients;
} homekit_server_t;
struct _client_context_t {
homekit_server_t *server;
int socket;
homekit_endpoint_t endpoint;
query_param_t *endpoint_params;
byte data[1024 + 18];
size_t data_size;
size_t data_available;
char *body;
size_t body_length;
http_parser parser;
int pairing_id;
byte permissions;
bool disconnect;
homekit_characteristic_t *current_characteristic;
homekit_value_t *current_value;
bool encrypted;
byte read_key[32];
byte write_key[32];
int count_reads;
int count_writes;
QueueHandle_t event_queue;
pair_verify_context_t *verify_context;
struct _client_context_t *next;
};
typedef struct {
homekit_characteristic_t *characteristic;
homekit_value_t value;
} characteristic_event_t;
void client_context_free(client_context_t *c);
void pairing_context_free(pairing_context_t *context);
homekit_server_t *server_new() {
homekit_server_t *server = malloc(sizeof(homekit_server_t));
FD_ZERO(&server->fds);
server->max_fd = 0;
server->client_count = 0;
server->config = NULL;
server->paired = false;
server->pairing_context = NULL;
server->clients = NULL;
return server;
}
void server_free(homekit_server_t *server) {
if (server->pairing_context)
pairing_context_free(server->pairing_context);
if (server->clients) {
client_context_t *client = server->clients;
while (client) {
client_context_t *next = client->next;
client_context_free(client);
client = next;
}
}
free(server);
}
#ifdef HOMEKIT_DEBUG
#define TLV_DEBUG(values) tlv_debug(values)
#else
#define TLV_DEBUG(values)
#endif
#define CLIENT_DEBUG(client, message, ...) DEBUG("[Client %d] " message, client->socket, ##__VA_ARGS__)
#define CLIENT_INFO(client, message, ...) INFO("[Client %d] " message, client->socket, ##__VA_ARGS__)
#define CLIENT_ERROR(client, message, ...) ERROR("[Client %d] " message, client->socket, ##__VA_ARGS__)
void tlv_debug(const tlv_values_t *values) {
DEBUG("Got following TLV values:");
for (tlv_t *t=values->head; t; t=t->next) {
char *escaped_payload = binary_to_string(t->value, t->size);
DEBUG("Type %d value (%d bytes): %s", t->type, t->size, escaped_payload);
free(escaped_payload);
}
}
typedef enum {
TLVType_Method = 0, // (integer) Method to use for pairing. See PairMethod
TLVType_Identifier = 1, // (UTF-8) Identifier for authentication
TLVType_Salt = 2, // (bytes) 16+ bytes of random salt
TLVType_PublicKey = 3, // (bytes) Curve25519, SRP public key or signed Ed25519 key
TLVType_Proof = 4, // (bytes) Ed25519 or SRP proof
TLVType_EncryptedData = 5, // (bytes) Encrypted data with auth tag at end
TLVType_State = 6, // (integer) State of the pairing process. 1=M1, 2=M2, etc.
TLVType_Error = 7, // (integer) Error code. Must only be present if error code is
// not 0. See TLVError
TLVType_RetryDelay = 8, // (integer) Seconds to delay until retrying a setup code
TLVType_Certificate = 9, // (bytes) X.509 Certificate
TLVType_Signature = 10, // (bytes) Ed25519
TLVType_Permissions = 11, // (integer) Bit value describing permissions of the controller
// being added.
// None (0x00): Regular user
// Bit 1 (0x01): Admin that is able to add and remove
// pairings against the accessory
TLVType_FragmentData = 13, // (bytes) Non-last fragment of data. If length is 0,
// it's an ACK.
TLVType_FragmentLast = 14, // (bytes) Last fragment of data
TLVType_Separator = 0xff,
} TLVType;
typedef enum {
TLVMethod_PairSetup = 1,
TLVMethod_PairVerify = 2,
TLVMethod_AddPairing = 3,
TLVMethod_RemovePairing = 4,
TLVMethod_ListPairings = 5,
} TLVMethod;
typedef enum {
TLVError_Unknown = 1, // Generic error to handle unexpected errors
TLVError_Authentication = 2, // Setup code or signature verification failed
TLVError_Backoff = 3, // Client must look at the retry delay TLV item and
// wait that many seconds before retrying
TLVError_MaxPeers = 4, // Server cannot accept any more pairings
TLVError_MaxTries = 5, // Server reached its maximum number of
// authentication attempts
TLVError_Unavailable = 6, // Server pairing method is unavailable
TLVError_Busy = 7, // Server is busy and cannot accept a pairing
// request at this time
} TLVError;
typedef enum {
// This specifies a success for the request
HAPStatus_Success = 0,
// Request denied due to insufficient privileges
HAPStatus_InsufficientPrivileges = -70401,
// Unable to communicate with requested services,
// e.g. the power to the accessory was turned off
HAPStatus_NoAccessoryConnection = -70402,
// Resource is busy, try again
HAPStatus_ResourceBusy = -70403,
// Connot write to read only characteristic
HAPStatus_ReadOnly = -70404,
// Cannot read from a write only characteristic
HAPStatus_WriteOnly = -70405,
// Notification is not supported for characteristic
HAPStatus_NotificationsUnsupported = -70406,
// Out of resources to process request
HAPStatus_OutOfResources = -70407,
// Operation timed out
HAPStatus_Timeout = -70408,
// Resource does not exist
HAPStatus_NoResource = -70409,
// Accessory received an invalid value in a write request
HAPStatus_InvalidValue = -70410,
// Insufficient Authorization
HAPStatus_InsufficientAuthorization = -70411,
} HAPStatus;
pair_verify_context_t *pair_verify_context_new() {
pair_verify_context_t *context = malloc(sizeof(pair_verify_context_t));
context->secret = NULL;
context->secret_size = 0;
context->session_key = NULL;
context->session_key_size = 0;
context->device_public_key = NULL;
context->device_public_key_size = 0;
context->accessory_public_key = NULL;
context->accessory_public_key_size = 0;
return context;
}
void pair_verify_context_free(pair_verify_context_t *context) {
if (context->secret)
free(context->secret);
if (context->session_key)
free(context->session_key);
if (context->device_public_key)
free(context->device_public_key);
if (context->accessory_public_key)
free(context->accessory_public_key);
free(context);
}
client_context_t *client_context_new() {
client_context_t *c = malloc(sizeof(client_context_t));
c->server = NULL;
c->endpoint_params = NULL;
c->data_size = sizeof(c->data);
c->data_available = 0;
c->body = NULL;
c->body_length = 0;
http_parser_init(&c->parser, HTTP_REQUEST);
c->parser.data = c;
c->pairing_id = -1;
c->encrypted = false;
c->count_reads = 0;
c->count_writes = 0;
c->disconnect = false;
c->event_queue = xQueueCreate(20, sizeof(characteristic_event_t*));
c->verify_context = NULL;
c->next = NULL;
return c;
}
void client_context_free(client_context_t *c) {
if (c->verify_context)
pair_verify_context_free(c->verify_context);
if (c->event_queue)
vQueueDelete(c->event_queue);
if (c->endpoint_params)
query_params_free(c->endpoint_params);
if (c->body)
free(c->body);
free(c);
}
pairing_context_t *pairing_context_new() {
pairing_context_t *context = malloc(sizeof(pairing_context_t));
context->srp = crypto_srp_new();
context->client = NULL;
context->public_key = NULL;
context->public_key_size = 0;
return context;
}
void pairing_context_free(pairing_context_t *context) {
if (context->srp) {
crypto_srp_free(context->srp);
}
if (context->public_key) {
free(context->public_key);
}
free(context);
}
void client_notify_characteristic(homekit_characteristic_t *ch, homekit_value_t value, void *client);
typedef enum {
characteristic_format_type = (1 << 1),
characteristic_format_meta = (1 << 2),
characteristic_format_perms = (1 << 3),
characteristic_format_events = (1 << 4),
} characteristic_format_t;
void write_characteristic_json(json_stream *json, client_context_t *client, const homekit_characteristic_t *ch, characteristic_format_t format, const homekit_value_t *value) {
json_string(json, "aid"); json_uint32(json, ch->service->accessory->id);
json_string(json, "iid"); json_uint32(json, ch->id);
if (format & characteristic_format_type) {
json_string(json, "type"); json_string(json, ch->type);
}
if (format & characteristic_format_perms) {
json_string(json, "perms"); json_array_start(json);
if (ch->permissions & homekit_permissions_paired_read)
json_string(json, "pr");
if (ch->permissions & homekit_permissions_paired_write)
json_string(json, "pw");
if (ch->permissions & homekit_permissions_notify)
json_string(json, "ev");
if (ch->permissions & homekit_permissions_additional_authorization)
json_string(json, "aa");
if (ch->permissions & homekit_permissions_timed_write)
json_string(json, "tw");
if (ch->permissions & homekit_permissions_hidden)
json_string(json, "hd");
json_array_end(json);
}
if ((format & characteristic_format_events) && (ch->permissions & homekit_permissions_notify)) {
bool events = homekit_characteristic_has_notify_callback(ch, client_notify_characteristic, client);
json_string(json, "ev"); json_boolean(json, events);
}
if (format & characteristic_format_meta) {
if (ch->description) {
json_string(json, "description"); json_string(json, ch->description);
}
const char *format_str = NULL;
switch(ch->format) {
case homekit_format_bool: format_str = "bool"; break;
case homekit_format_uint8: format_str = "uint8"; break;
case homekit_format_uint16: format_str = "uint16"; break;
case homekit_format_uint32: format_str = "uint32"; break;
case homekit_format_uint64: format_str = "uint64"; break;
case homekit_format_int: format_str = "int"; break;
case homekit_format_float: format_str = "float"; break;
case homekit_format_string: format_str = "string"; break;
case homekit_format_tlv: format_str = "tlv8"; break;
case homekit_format_data: format_str = "data"; break;
}
if (format_str) {
json_string(json, "format"); json_string(json, format_str);
}
const char *unit_str = NULL;
switch(ch->unit) {
case homekit_unit_none: break;
case homekit_unit_celsius: unit_str = "celsius"; break;
case homekit_unit_percentage: unit_str = "percentage"; break;
case homekit_unit_arcdegrees: unit_str = "arcdegrees"; break;
case homekit_unit_lux: unit_str = "lux"; break;
case homekit_unit_seconds: unit_str = "seconds"; break;
}
if (unit_str) {
json_string(json, "unit"); json_string(json, unit_str);
}
if (ch->min_value) {
json_string(json, "minValue"); json_float(json, *ch->min_value);
}
if (ch->max_value) {
json_string(json, "maxValue"); json_float(json, *ch->max_value);
}
if (ch->min_step) {
json_string(json, "minStep"); json_float(json, *ch->min_step);
}
if (ch->max_len) {
json_string(json, "maxLen"); json_uint32(json, *ch->max_len);
}
if (ch->max_data_len) {
json_string(json, "maxDataLen"); json_uint32(json, *ch->max_data_len);
}
if (ch->valid_values.count) {
json_string(json, "valid-values"); json_array_start(json);
for (int i=0; i<ch->valid_values.count; i++) {
json_uint16(json, ch->valid_values.values[i]);
}
json_array_end(json);
}
if (ch->valid_values_ranges.count) {
json_string(json, "valid-values-range"); json_array_start(json);
for (int i=0; i<ch->valid_values_ranges.count; i++) {
json_array_start(json);
json_integer(json, ch->valid_values_ranges.ranges[i].start);
json_integer(json, ch->valid_values_ranges.ranges[i].end);
json_array_end(json);
}
json_array_end(json);
}
}
if (ch->permissions & homekit_permissions_paired_read) {
homekit_value_t v = value ? *value : ch->getter_ex ? ch->getter_ex(ch) : ch->value;
if (v.is_null) {
// json_string(json, "value"); json_null(json);
} else if (v.format != ch->format) {
ERROR("Characteristic value format is different from characteristic format");
} else {
switch(v.format) {
case homekit_format_bool: {
json_string(json, "value"); json_boolean(json, v.bool_value);
break;
}
case homekit_format_uint8: {
json_string(json, "value"); json_uint8(json, v.uint8_value);
break;
}
case homekit_format_uint16: {
json_string(json, "value"); json_uint16(json, v.uint16_value);
break;
}
case homekit_format_uint32: {
json_string(json, "value"); json_uint32(json, v.uint32_value);
break;
}
case homekit_format_uint64: {
json_string(json, "value"); json_uint64(json, v.uint64_value);
break;
}
case homekit_format_int: {
json_string(json, "value"); json_integer(json, v.int_value);
break;
}
case homekit_format_float: {
json_string(json, "value"); json_float(json, v.float_value);
break;
}
case homekit_format_string: {
json_string(json, "value"); json_string(json, v.string_value);
break;
}
case homekit_format_tlv: {
json_string(json, "value");
if (!v.tlv_values) {
json_string(json, "");
} else {
size_t tlv_size = 0;
tlv_format(v.tlv_values, NULL, &tlv_size);
if (tlv_size == 0) {
json_string(json, "");
} else {
byte *tlv_data = malloc(tlv_size);
tlv_format(v.tlv_values, tlv_data, &tlv_size);
size_t encoded_tlv_size = base64_encoded_size(tlv_data, tlv_size);
byte *encoded_tlv_data = malloc(encoded_tlv_size + 1);
base64_encode(tlv_data, tlv_size, encoded_tlv_data);
encoded_tlv_data[encoded_tlv_size] = 0;
json_string(json, (char*) encoded_tlv_data);
free(encoded_tlv_data);
free(tlv_data);
}
}
break;
}
case homekit_format_data: {
json_string(json, "value");
if (!v.data_value || v.data_size == 0) {
json_string(json, "");
} else {
size_t encoded_data_size = base64_encoded_size(v.data_value, v.data_size);
byte *encoded_data = malloc(encoded_data_size + 1);
base64_encode(v.data_value, v.data_size, encoded_data);
encoded_data[encoded_data_size] = 0;
json_string(json, (char*) encoded_data);
free(encoded_data);
}
break;
}
}
}
if (!value && ch->getter_ex) {
// called getter to get value, need to free it
homekit_value_destruct(&v);
}
}
}
int client_send_encrypted(
client_context_t *context,
byte *payload, size_t size
) {
if (!context || !context->encrypted)
return -1;
byte nonce[12];
memset(nonce, 0, sizeof(nonce));
byte encrypted[1024 + 18];
int payload_offset = 0;
while (payload_offset < size) {
size_t chunk_size = size - payload_offset;
if (chunk_size > 1024)
chunk_size = 1024;
byte aead[2] = {chunk_size % 256, chunk_size / 256};
memcpy(encrypted, aead, 2);
byte i = 4;
int x = context->count_reads++;
while (x) {
nonce[i++] = x % 256;
x /= 256;
}
size_t available = sizeof(encrypted) - 2;
int r = crypto_chacha20poly1305_encrypt(
context->read_key, nonce, aead, 2,
payload+payload_offset, chunk_size,
encrypted+2, &available
);
if (r) {
ERROR("Failed to chacha encrypt payload (code %d)", r);
return -1;
}
payload_offset += chunk_size;
write(context->socket, encrypted, available + 2);
}
return 0;
}
int client_decrypt(
client_context_t *context,
byte *payload, size_t payload_size,
byte *decrypted, size_t *decrypted_size
) {
if (!context || !context->encrypted)
return -1;
const size_t block_size = 1024 + 16 + 2;
size_t required_decrypted_size = payload_size / block_size * 1024;
if (payload_size % block_size > 0)
required_decrypted_size += payload_size % block_size - 16 - 2;
if (*decrypted_size < required_decrypted_size) {
*decrypted_size = required_decrypted_size;
return -2;
}
*decrypted_size = required_decrypted_size;
byte nonce[12];
memset(nonce, 0, sizeof(nonce));
int payload_offset = 0;
int decrypted_offset = 0;
while (payload_offset < payload_size) {
size_t chunk_size = payload[payload_offset] + payload[payload_offset+1]*256;
if (chunk_size+18 > payload_size-payload_offset) {
// Unfinished chunk
break;
}
byte i = 4;
int x = context->count_writes++;
while (x) {
nonce[i++] = x % 256;
x /= 256;
}
size_t decrypted_len = *decrypted_size - decrypted_offset;
int r = crypto_chacha20poly1305_decrypt(
context->write_key, nonce, payload+payload_offset, 2,
payload+payload_offset+2, chunk_size + 16,
decrypted, &decrypted_len
);
if (r) {
ERROR("Failed to chacha decrypt payload (code %d)", r);
return -1;
}
decrypted_offset += decrypted_len;
payload_offset += chunk_size + 18;
}
return payload_offset;
}
void homekit_setup_mdns(homekit_server_t *server);
void client_notify_characteristic(homekit_characteristic_t *ch, homekit_value_t value, void *context) {
client_context_t *client = context;
if (client->current_characteristic == ch && client->current_value && homekit_value_equal(client->current_value, &value))
// This value is set by this client, no need to send notification
return;
DEBUG("Got characteristic %d.%d change event", ch->service->accessory->id, ch->id);
if (!client->event_queue) {
ERROR("Client has no event queue. Skipping notification");
return;
}
characteristic_event_t *event = malloc(sizeof(characteristic_event_t));
event->characteristic = ch;
homekit_value_copy(&event->value, &value);
DEBUG("Sending event to client %d", client->socket);
xQueueSendToBack(client->event_queue, &event, 10);
}
void client_send(client_context_t *context, byte *data, size_t data_size) {
#if HOMEKIT_DEBUG
if (data_size < 4096) {
char *payload = binary_to_string(data, data_size);
CLIENT_DEBUG(context, "Sending payload: %s", payload);
free(payload);
}
#endif
if (context->encrypted) {
int r = client_send_encrypted(context, data, data_size);
if (r) {
CLIENT_ERROR(context, "Failed to encrypt response (code %d)", r);
return;
}
} else {
write(context->socket, data, data_size);
}
}
void client_send_chunk(byte *data, size_t size, void *arg) {
client_context_t *context = arg;
size_t payload_size = size + 8;
byte *payload = malloc(payload_size);
int offset = snprintf((char *)payload, payload_size, "%x\r\n", size);
memcpy(payload + offset, data, size);
payload[offset + size] = '\r';
payload[offset + size + 1] = '\n';
client_send(context, payload, offset + size + 2);
free(payload);
}
void send_204_response(client_context_t *context) {
static char response[] = "HTTP/1.1 204 No Content\r\n\r\n";
client_send(context, (byte *)response, sizeof(response)-1);
}
void send_404_response(client_context_t *context) {
static char response[] = "HTTP/1.1 404 Not Found\r\n\r\n";
client_send(context, (byte *)response, sizeof(response)-1);
}
typedef struct _client_event {
const homekit_characteristic_t *characteristic;
homekit_value_t value;
struct _client_event *next;
} client_event_t;
void send_client_events(client_context_t *context, client_event_t *events) {
CLIENT_DEBUG(context, "Sending EVENT");
DEBUG_HEAP();
static byte http_headers[] =
"EVENT/1.0 200 OK\r\n"
"Content-Type: application/hap+json\r\n"
"Transfer-Encoding: chunked\r\n\r\n";
client_send(context, http_headers, sizeof(http_headers)-1);
// ~35 bytes per event JSON
// 256 should be enough for ~7 characteristic updates
json_stream *json = json_new(256, client_send_chunk, context);
json_object_start(json);
json_string(json, "characteristics"); json_array_start(json);
client_event_t *e = events;
while (e) {
json_object_start(json);
write_characteristic_json(json, context, e->characteristic, 0, &e->value);
json_object_end(json);
e = e->next;
}
json_array_end(json);
json_object_end(json);
json_flush(json);
json_free(json);
client_send_chunk(NULL, 0, context);
}
void send_tlv_response(client_context_t *context, tlv_values_t *values);
void send_tlv_error_response(client_context_t *context, int state, TLVError error) {
tlv_values_t *response = tlv_new();
tlv_add_integer_value(response, TLVType_State, 1, state);
tlv_add_integer_value(response, TLVType_Error, 1, error);
send_tlv_response(context, response);
}
void send_tlv_response(client_context_t *context, tlv_values_t *values) {
CLIENT_DEBUG(context, "Sending TLV response");
TLV_DEBUG(values);
size_t payload_size = 0;
tlv_format(values, NULL, &payload_size);
byte *payload = malloc(payload_size);
int r = tlv_format(values, payload, &payload_size);
if (r) {
CLIENT_ERROR(context, "Failed to format TLV payload (code %d)", r);
free(payload);
return;
}
tlv_free(values);
static char *http_headers =
"HTTP/1.1 200 OK\r\n"
"Content-Type: application/pairing+tlv8\r\n"
"Content-Length: %d\r\n"
"Connection: keep-alive\r\n\r\n";
int response_size = strlen(http_headers) + payload_size + 32;
char *response = malloc(response_size);
int response_len = snprintf(response, response_size, http_headers, payload_size);
if (response_size - response_len < payload_size + 1) {
CLIENT_ERROR(context, "Incorrect response buffer size %d: headers took %d, payload size %d", response_size, response_len, payload_size);
free(response);
free(payload);
return;
}
memcpy(response+response_len, payload, payload_size);
response_len += payload_size;
free(payload);
client_send(context, (byte *)response, response_len);
free(response);
}
static byte json_200_response_headers[] =
"HTTP/1.1 200 OK\r\n"
"Content-Type: application/hap+json\r\n"
"Transfer-Encoding: chunked\r\n"
"Connection: keep-alive\r\n\r\n";
static byte json_207_response_headers[] =
"HTTP/1.1 207 Multi-Status\r\n"
"Content-Type: application/hap+json\r\n"
"Transfer-Encoding: chunked\r\n"
"Connection: keep-alive\r\n\r\n";
void send_json_response(client_context_t *context, int status_code, byte *payload, size_t payload_size) {
CLIENT_DEBUG(context, "Sending JSON response");
DEBUG_HEAP();
static char *http_headers =
"HTTP/1.1 %d %s\r\n"
"Content-Type: application/hap+json\r\n"
"Content-Length: %d\r\n"
"Connection: keep-alive\r\n\r\n";
CLIENT_DEBUG(context, "Payload: %s", payload);
const char *status_text = "OK";
switch (status_code) {
case 204: status_text = "No Content"; break;
case 207: status_text = "Multi-Status"; break;
case 400: status_text = "Bad Request"; break;
case 404: status_text = "Not Found"; break;
case 422: status_text = "Unprocessable Entity"; break;
case 500: status_text = "Internal Server Error"; break;
case 503: status_text = "Service Unavailable"; break;
}
int response_size = strlen(http_headers) + payload_size + strlen(status_text) + 32;
char *response = malloc(response_size);
if (!response) {
CLIENT_ERROR(context, "Failed to allocate response buffer of size %d", response_size);
return;
}
int response_len = snprintf(response, response_size, http_headers, status_code, status_text, payload_size);
if (response_size - response_len < payload_size + 1) {
CLIENT_ERROR(context, "Incorrect response buffer size %d: headers took %d, payload size %d", response_size, response_len, payload_size);
free(response);
return;
}
memcpy(response+response_len, payload, payload_size);
response_len += payload_size;
response[response_len] = 0; // required for debug output
CLIENT_DEBUG(context, "Sending HTTP response: %s", response);
client_send(context, (byte *)response, response_len);
free(response);
}
void send_json_error_response(client_context_t *context, int status_code, HAPStatus status) {
byte buffer[32];
int size = snprintf((char *)buffer, sizeof(buffer), "{\"status\": %d}", status);
send_json_response(context, status_code, buffer, size);
}
static client_context_t *current_client_context = NULL;
homekit_client_id_t homekit_get_client_id() {
return (homekit_client_id_t)current_client_context;
}
bool homekit_client_is_admin() {
if (!current_client_context)
return false;
return current_client_context->permissions & pairing_permissions_admin;
}
int homekit_client_send(unsigned char *data, size_t size) {
if (!current_client_context)
return -1;
client_send(current_client_context, data, size);
return 0;
}
void homekit_server_on_identify(client_context_t *context) {
CLIENT_INFO(context, "Identify");
DEBUG_HEAP();
if (context->server->paired) {
// Already paired
send_json_error_response(context, 400, HAPStatus_InsufficientPrivileges);
return;
}
send_204_response(context);
homekit_accessory_t *accessory =
homekit_accessory_by_id(context->server->config->accessories, 1);
if (!accessory) {
return;
}
homekit_service_t *accessory_info =
homekit_service_by_type(accessory, HOMEKIT_SERVICE_ACCESSORY_INFORMATION);
if (!accessory_info) {
return;
}
homekit_characteristic_t *ch_identify =