555 lines
19 KiB
C
555 lines
19 KiB
C
/*
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* DACP protocol handler. This file is part of Shairport Sync.
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* Copyright (c) Mike Brady 2017
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "dacp.h"
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#include "common.h"
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#include "config.h"
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#include <arpa/inet.h>
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#include <errno.h>
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#include <math.h>
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#include <memory.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include "tinyhttp/http.h"
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typedef struct {
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uint16_t port;
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short connection_family; // AF_INET6 or AF_INET
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uint32_t scope_id; // if it's an ipv6 connection, this will be its scope id
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char ip_string[INET6_ADDRSTRLEN]; // the ip string pointing to the client
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uint32_t active_remote_id; // send this when you want to send remote control commands
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} dacp_server_record;
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pthread_t dacp_monitor_thread;
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dacp_server_record dacp_server;
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// HTTP Response data/funcs (See the tinyhttp example.cpp file for more on this.)
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struct HttpResponse {
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void *body; // this will be a malloc'ed pointer
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ssize_t malloced_size; // this will be its allocated size
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ssize_t size; // the current size of the content
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int code;
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};
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static void *response_realloc(void *opaque, void *ptr, int size) { return realloc(ptr, size); }
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static void response_body(void *opaque, const char *data, int size) {
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struct HttpResponse *response = (struct HttpResponse *)opaque;
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ssize_t space_available = response->malloced_size - response->size;
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if (space_available < size) {
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// debug(1,"Getting more space for the response -- need %d bytes but only %ld bytes left.\n", size,
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// size - space_available);
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ssize_t size_requested = size - space_available + response->malloced_size + 16384;
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void *t = realloc(response->body, size_requested);
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response->malloced_size = size_requested;
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if (t)
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response->body = t;
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else {
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debug(1,"Can't allocate any more space for parser.\n");
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exit(-1);
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}
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}
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memcpy(response->body + response->size, data, size);
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response->size += size;
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}
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static void response_header(void *opaque, const char *ckey, int nkey, const char *cvalue,
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int nvalue) { /* example doesn't care about headers */
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}
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static void response_code(void *opaque, int code) {
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struct HttpResponse *response = (struct HttpResponse *)opaque;
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response->code = code;
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}
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static const struct http_funcs responseFuncs = {
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response_realloc, response_body, response_header, response_code,
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};
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static pthread_mutex_t dacp_conversation_lock = PTHREAD_MUTEX_INITIALIZER;
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static pthread_mutex_t dacp_server_information_lock = PTHREAD_MUTEX_INITIALIZER;
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static pthread_cond_t dacp_server_information_cv = PTHREAD_COND_INITIALIZER;
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int dacp_send_command(const char *command, char **body, size_t *bodysize) {
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// will malloc space for the body or set it to NULL -- the caller should free it.
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// Using some custom HTTP-like return codes
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// 498 Bad Address information for the DACP server
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// 497 Can't establish a socket to the DACP server
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// 496 Can't connect to the DACP server
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// 495 Error receiving response
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// 494 This client is already busy
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// 493 Client failed to send a message
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// try to do this transaction on the DACP server, but don't wait for more than 20 ms to be allowed
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// to do it.
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struct timespec mutex_wait_time;
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mutex_wait_time.tv_sec = 0;
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mutex_wait_time.tv_nsec = 20000000; // 20 ms
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struct addrinfo hints, *res;
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int sockfd;
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struct HttpResponse response;
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response.body = NULL;
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response.malloced_size = 0;
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response.size = 0;
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response.code = 0;
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char portstring[10], server[256], message[1024];
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memset(&portstring, 0, sizeof(portstring));
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if (dacp_server.connection_family == AF_INET6) {
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sprintf(server, "%s%%%u", dacp_server.ip_string, dacp_server.scope_id);
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} else {
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strcpy(server, dacp_server.ip_string);
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}
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sprintf(portstring, "%u", dacp_server.port);
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// first, load up address structs with getaddrinfo():
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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debug(1, "DHCP port string is \"%s:%s\".", server, portstring);
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int ires = getaddrinfo(server, portstring, &hints, &res);
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if (ires) {
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// debug(1,"Error %d \"%s\" at getaddrinfo.",ires,gai_strerror(ires));
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response.code = 498; // Bad Address information for the DACP server
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} else {
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// only do this one at a time -- not sure it is necessary, but better safe than sorry
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int mutex_reply = pthread_mutex_timedlock(&dacp_conversation_lock, &mutex_wait_time);
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if (mutex_reply == 0) {
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// make a socket:
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sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
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if (sockfd == -1) {
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// debug(1, "DACP socket could not be created -- error %d: \"%s\".",errno,strerror(errno));
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response.code = 497; // Can't establish a socket to the DACP server
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} else {
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// connect!
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// debug(1, "DACP socket created.");
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if (connect(sockfd, res->ai_addr, res->ai_addrlen) < 0) {
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// debug(1, "DACP connect failed.");
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response.code = 496; // Can't connect to the DACP server
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} else {
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// debug(1,"DACP connect succeeded.");
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sprintf(message, "GET /ctrl-int/1/%s HTTP/1.1\r\nHost: %s:%u\r\nActive-Remote: %u\r\n\r\n",
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command, dacp_server.ip_string, dacp_server.port, dacp_server.active_remote_id);
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// Send command
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// debug(1,"DACP connect message: \"%s\".",message);
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if (send(sockfd, message, strlen(message), 0) != strlen(message)) {
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// debug(1, "Send failed");
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response.code = 493; // Client failed to send a message
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} else {
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response.body = malloc(2048); // it can resize this if necessary
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response.malloced_size = 2048;
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struct http_roundtripper rt;
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http_init(&rt, responseFuncs, &response);
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int needmore = 1;
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int looperror = 0;
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char buffer[1024];
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memset(buffer,0,sizeof(buffer));
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while (needmore && !looperror) {
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const char *data = buffer;
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int ndata = recv(sockfd, buffer, sizeof(buffer), 0);
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// debug(1,"Received %d bytes: \"%s\".",ndata,buffer);
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if (ndata <= 0) {
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debug(1, "Error receiving data.");
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free(response.body);
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response.body = NULL;
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response.malloced_size = 0;
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response.size = 0;
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response.code = 495; // Error receiving response
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looperror = 1;
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}
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while (needmore && ndata && !looperror) {
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int read;
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needmore = http_data(&rt, data, ndata, &read);
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ndata -= read;
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data += read;
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}
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}
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if (http_iserror(&rt)) {
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debug(1, "Error parsing data.");
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free(response.body);
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response.body = NULL;
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response.malloced_size = 0;
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response.size = 0;
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}
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// debug(1,"Size of response body is %d",response.size);
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http_free(&rt);
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}
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}
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close(sockfd);
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// debug(1,"DACP socket closed.");
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}
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pthread_mutex_unlock(&dacp_conversation_lock);
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} else {
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// debug(1, "Could not acquire a lock on the dacp transmit/receive section. Possible timeout?");
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response.code = 494; // This client is already busy
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}
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}
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*body = response.body;
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*bodysize = response.size;
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return response.code;
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}
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int send_simple_dacp_command(const char *command) {
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int reply = 0;
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char *server_reply = NULL;
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debug(1, "Sending command \"%s\".", command);
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ssize_t reply_size = 0;
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reply = dacp_send_command(command, &server_reply, &reply_size);
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if (server_reply) {
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free(server_reply);
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server_reply = NULL;
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}
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return reply;
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}
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// this will be running on the thread of its caller, not of the conversation thread...
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void set_dacp_server_information(rtsp_conn_info *conn) { // tell the DACP conversation thread that
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// the port has been set or changed
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pthread_mutex_lock(&dacp_server_information_lock);
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dacp_server.port = conn->dacp_port;
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dacp_server.connection_family = conn->connection_ip_family;
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dacp_server.scope_id = conn->self_scope_id;
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strncpy(dacp_server.ip_string, conn->client_ip_string, INET6_ADDRSTRLEN);
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dacp_server.active_remote_id = conn->dacp_active_remote;
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pthread_cond_signal(&dacp_server_information_cv);
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pthread_mutex_unlock(&dacp_server_information_lock);
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}
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void *dacp_monitor_thread_code(void *na) {
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int scan_index = 0;
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char server_reply[10000];
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debug(1, "DACP monitor thread started.");
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// wait until we get a valid port number to begin monitoring it
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int32_t revision_number = 1;
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while (1) {
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pthread_mutex_lock(&dacp_server_information_lock);
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while (dacp_server.port == 0) {
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debug(1, "Wait for a valid DACP port");
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pthread_cond_wait(&dacp_server_information_cv, &dacp_server_information_lock);
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}
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pthread_mutex_unlock(&dacp_server_information_lock);
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debug(1, "DACP Server ID \"%u\" at \"%s:%u\", scan %d.", dacp_server.active_remote_id,
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dacp_server.ip_string, dacp_server.port, scan_index++);
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ssize_t le;
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char *response = NULL;
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int32_t item_size;
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char command[1024] = "";
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snprintf(command, sizeof(command) - 1, "playstatusupdate?revision-number=%d", revision_number);
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// debug(1,"Command: \"%s\"",command);
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int result = dacp_send_command(command, &response, &le);
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if (result == 200) {
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char *sp = response;
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if (le >= 0) {
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// here start looking for the contents of the status update
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if (dacp_tlv_crawl(&sp, &item_size) == 'cmst') { // status
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sp -= item_size; // drop down into the array -- don't skip over it
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le -= 8;
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char typestring[5];
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while (le >= 8) {
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uint32_t type = dacp_tlv_crawl(&sp, &item_size);
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*(uint32_t *)typestring = htonl(type);
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typestring[4] = 0;
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printf("\"%s\" %4d", typestring, item_size);
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le -= item_size + 8;
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char *t;
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char u;
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char *st;
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int32_t r;
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uint64_t s, v;
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int i;
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switch (type) {
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case 'mstt':
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case 'cant':
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case 'cast':
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case 'cmmk':
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case 'caas':
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case 'caar':
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case 'astm':
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t = sp - item_size;
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r = ntohl(*(int32_t *)(t));
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printf(" %d", r);
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printf(" (0x");
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t = sp - item_size;
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for (i = 0; i < item_size; i++) {
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printf("%02x", *t&0xff);
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t++;
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}
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printf(")");
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break;
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case 'cmsr':
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t = sp - item_size;
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revision_number = ntohl(*(int32_t *)(t));
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printf(" Serial Number: %d", revision_number);
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break;
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case 'cann':
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case 'cana':
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case 'canl':
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case 'cang':
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t = sp - item_size;
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st = strndup(t, item_size);
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printf(" \"%s\"", st);
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free(st);
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break;
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case 'asai':
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t = sp - item_size;
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s = ntohl(*(uint32_t *)(t));
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s = s << 32;
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t += 4;
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v = (ntohl(*(uint32_t *)(t))) & 0xffffffff;
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s += v;
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printf(" %lu", s);
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printf(" (0x");
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t = sp - item_size;
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for (i = 0; i < item_size; i++) {
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printf("%02x", *t&0xff);
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t++;
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}
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printf(")");
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break;
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default:
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printf(" 0x");
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t = sp - item_size;
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for (i = 0; i < item_size; i++) {
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printf("%02x", *t&0xff);
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t++;
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}
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break;
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}
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printf("\n");
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}
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} else {
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printf("Status Update not found.\n");
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}
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} else {
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debug(1, "Can't find any content in playerstatusupdate request");
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}
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} else {
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debug(1, "Unexpected response %d to playerstatusupdate request", result);
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}
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if (response) {
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free(response);
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response = NULL;
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};
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sleep(1);
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}
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debug(1, "DACP monitor thread exiting.");
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pthread_exit(NULL);
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}
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void dacp_monitor_start() {
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memset(&dacp_server, 0, sizeof(dacp_server_record));
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pthread_create(&dacp_monitor_thread, NULL, dacp_monitor_thread_code, NULL);
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}
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uint32_t dacp_tlv_crawl(char **p, int32_t *length) {
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char typecode[5];
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memcpy(typecode, *p, 4);
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typecode[4] = '\0';
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uint32_t type = ntohl(*(uint32_t *)*p);
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*p += 4;
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*length = ntohl(*(int32_t *)*p);
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*p += 4 + *length;
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// debug(1,"Type seen: '%s' of length %d",typecode,*length);
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return type;
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}
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int32_t dacp_get_client_volume(rtsp_conn_info *conn) {
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char *server_reply = NULL;
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int32_t overall_volume = -1;
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ssize_t reply_size;
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int response =
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dacp_send_command("getproperty?properties=dmcp.volume", &server_reply, &reply_size);
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if (response == 200) { // if we get an okay
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uint32_t *np = (uint32_t *)server_reply;
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overall_volume = ntohl(*np);
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// debug(1,"Overall Volume is %d.",overall_volume);
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free(server_reply);
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} else {
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debug(1, "Unexpected response %d to dacp volume control request", response);
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}
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return overall_volume;
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}
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int dacp_set_include_speaker_volume(rtsp_conn_info *conn, int64_t machine_number, int32_t vo) {
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char message[1000];
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memset(message, 0, sizeof(message));
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sprintf(message, "setproperty?include-speaker-id=%ld&dmcp.volume=%d", machine_number, vo);
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// debug(1,"sending \"%s\"",message);
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return send_simple_dacp_command(message);
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// should return 204
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}
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int dacp_set_speaker_volume(rtsp_conn_info *conn, int64_t machine_number, int32_t vo) {
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char message[1000];
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memset(message, 0, sizeof(message));
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sprintf(message, "setproperty?speaker-id=%ld&dmcp.volume=%d", machine_number, vo);
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// debug(1,"sending \"%s\"",message);
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return send_simple_dacp_command(message);
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// should return 204
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}
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int dacp_get_speaker_list(rtsp_conn_info *conn, dacp_spkr_stuff *speaker_info,
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int max_size_of_array) {
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char *server_reply = NULL;
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int speaker_index = -1; // will be incremented before use
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int reply = -1; // will bve fixed if there is no problem
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ssize_t le;
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int response = dacp_send_command("getspeakers", &server_reply, &le);
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if (response == 200) {
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char *sp = server_reply;
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int32_t item_size;
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if (le >= 8) {
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if (dacp_tlv_crawl(&sp, &item_size) == 'casp') {
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// debug(1,"Speakers:",item_size);
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sp -= item_size; // drop down into the array -- don't skip over it
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le -= 8;
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while (le >= 8) {
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uint32_t type = dacp_tlv_crawl(&sp, &item_size);
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if (type == 'mdcl') { // drop down into the dictionary -- don't skip over it
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// debug(1,">>>> Dictionary:");
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sp -= item_size;
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le -= 8;
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speaker_index++;
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if (speaker_index == max_size_of_array)
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return -1; // too many speakers
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speaker_info[speaker_index].active = 0;
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speaker_info[speaker_index].speaker_number = 0;
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speaker_info[speaker_index].volume = 0;
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speaker_info[speaker_index].name = NULL;
|
|
} else {
|
|
le -= item_size + 8;
|
|
char *t;
|
|
char u;
|
|
int32_t r;
|
|
int64_t s, v;
|
|
switch (type) {
|
|
case 'minm':
|
|
t = sp - item_size;
|
|
speaker_info[speaker_index].name = strndup(t, item_size);
|
|
// debug(1," \"%s\"",speaker_info[speaker_index].name);
|
|
break;
|
|
/*
|
|
case 'cads':
|
|
t = sp-item_size;
|
|
r = ntohl(*(int32_t*)(t));
|
|
//debug(1,"CADS: \"%d\".",r);
|
|
break;
|
|
*/
|
|
case 'cmvo':
|
|
t = sp - item_size;
|
|
r = ntohl(*(int32_t *)(t));
|
|
speaker_info[speaker_index].volume = r;
|
|
// debug(1,"Volume: \"%d\".",r);
|
|
break;
|
|
case 'msma':
|
|
t = sp - item_size;
|
|
s = ntohl(*(uint32_t *)(t));
|
|
s = s << 32;
|
|
t += 4;
|
|
v = (ntohl(*(uint32_t *)(t))) & 0xffffffff;
|
|
s += v;
|
|
speaker_info[speaker_index].speaker_number = s;
|
|
// debug(1,"Speaker machine number: %ld",s);
|
|
break;
|
|
|
|
case 'caia':
|
|
speaker_info[speaker_index].active = 1;
|
|
break;
|
|
/*
|
|
case 'caip':
|
|
case 'cavd':
|
|
case 'caiv':
|
|
t = sp-item_size;
|
|
u = *t;
|
|
//debug(1,"Value: \"%d\".",u);
|
|
break;
|
|
*/
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
// debug(1,"Total of %d speakers found. Here are the active ones:",speaker_index+1);
|
|
reply = speaker_index + 1; // number of speaker entries in the array
|
|
} else {
|
|
debug(1, "Speaker array not found.");
|
|
}
|
|
/*
|
|
int i;
|
|
for (i=0;i<le;i++) {
|
|
if (*sp < ' ')
|
|
debug(1,"%d %02x", i, *sp);
|
|
else
|
|
debug(1,"%d %02x '%c'", i, *sp,*sp);
|
|
sp++;
|
|
}
|
|
*/
|
|
} else {
|
|
debug(1, "Can't find any content in dacp speakers request");
|
|
}
|
|
free(server_reply);
|
|
server_reply = NULL;
|
|
} else {
|
|
debug(1, "Unexpected response %d to dacp speakers request", response);
|
|
}
|
|
return reply;
|
|
}
|