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owntone-server/src/outputs/cast.c

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/*
* Copyright (C) 2015-2016 Espen Jürgensen <espenjurgensen@gmail.com>
*
* TODO Credits
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <ifaddrs.h>
#include <unistd.h>
#include <fcntl.h>
#include <endian.h>
#include <gnutls/gnutls.h>
#include <json-c/json.h>
#include <event2/event.h>
#include "conffile.h"
#include "mdns.h"
#include "logger.h"
#include "player.h"
#include "outputs.h"
#include "cast_channel.pb-c.h"
// Number of bytes to request from TLS connection
#define MAX_BUF 4096
// CA file location (not very portable...?)
#define CAFILE "/etc/ssl/certs/ca-certificates.crt"
// Namespaces
#define NS_CONNECTION "urn:x-cast:com.google.cast.tp.connection"
#define NS_RECEIVER "urn:x-cast:com.google.cast.receiver"
#define NS_HEARTBEAT "urn:x-cast:com.google.cast.tp.heartbeat"
#define NS_MEDIA "urn:x-cast:com.google.cast.media"
#define USE_TRANSPORT_ID (1 << 1)
#define USE_REQUEST_ID (1 << 2)
#define USE_REQUEST_ID_ONLY (1 << 3)
#define CALLBACK_REGISTER_SIZE 32
union sockaddr_all
{
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
struct sockaddr sa;
struct sockaddr_storage ss;
};
struct cast_session;
struct cast_msg_payload;
typedef void (*cast_reply_cb)(struct cast_session *cs, struct cast_msg_payload *payload);
struct cast_session
{
enum output_device_state state;
// Connection fd and session, and listener event
int server_fd;
gnutls_session_t tls_session;
struct event *ev;
char *devname;
char *address;
unsigned short port;
float volume;
// IP address URL of forked-daapd's mp3 stream
char stream_url[128];
// Outgoing request which have the USE_REQUEST_ID flag get a new id, and a
// callback is registered. The callback is called when an incoming message
// from the peer with that request id arrives.
int request_id;
cast_reply_cb callback_register[CALLBACK_REGISTER_SIZE];
// Session info from the ChromeCast
char *transport_id;
char *session_id;
int media_session_id;
/* Do not dereference - only passed to the status cb */
struct output_device *device;
struct output_session *output_session;
output_status_cb status_cb;
struct cast_session *next;
};
enum cast_msg_types
{
UNKNOWN,
PING,
PONG,
CONNECT,
CLOSE,
GET_STATUS,
RECEIVER_STATUS,
LAUNCH,
MEDIA_CONNECT,
MEDIA_GET_STATUS,
MEDIA_STATUS,
MEDIA_LOAD,
MEDIA_PLAY,
MEDIA_PAUSE,
MEDIA_STOP,
MEDIA_LOAD_FAILED,
SET_VOLUME,
};
struct cast_msg_basic
{
enum cast_msg_types type;
char *tag; // Used for looking up incoming message type
char *namespace;
char *payload;
int flags;
};
struct cast_msg_payload
{
enum cast_msg_types type;
int request_id;
const char *session_id;
const char *transport_id;
int media_session_id;
};
// Array of the cast messages that we use. Must be in sync with cast_msg_types.
struct cast_msg_basic cast_msg[] =
{
{
.type = UNKNOWN,
.namespace = "",
.payload = "",
},
{
.type = PING,
.tag = "PING",
.namespace = NS_HEARTBEAT,
.payload = "{'type':'PING'}",
},
{
.type = PONG,
.tag = "PONG",
.namespace = NS_HEARTBEAT,
.payload = "{'type':'PONG'}",
},
{
.type = CONNECT,
.namespace = NS_CONNECTION,
.payload = "{'type':'CONNECT'}",
// msg.payload_utf8 = "{\"origin\":{},\"userAgent\":\"forked-daapd\",\"type\":\"CONNECT\",\"senderInfo\":{\"browserVersion\":\"44.0.2403.30\",\"version\":\"15.605.1.3\",\"connectionType\":1,\"platform\":4,\"sdkType\":2,\"systemVersion\":\"Macintosh; Intel Mac OS X10_10_3\"}}";
},
{
.type = CLOSE,
.tag = "CLOSE",
.namespace = NS_CONNECTION,
.payload = "{'type':'CLOSE'}",
},
{
.type = GET_STATUS,
.namespace = NS_RECEIVER,
.payload = "{'type':'GET_STATUS','requestId':%d}",
.flags = USE_REQUEST_ID_ONLY,
},
{
.type = RECEIVER_STATUS,
.tag = "RECEIVER_STATUS",
},
{
.type = LAUNCH,
.namespace = NS_RECEIVER,
.payload = "{'type':'LAUNCH','requestId':%d,'appId':'CC1AD845'}",
.flags = USE_REQUEST_ID_ONLY,
},
{
.type = MEDIA_CONNECT,
.namespace = NS_CONNECTION,
.payload = "{'type':'CONNECT'}",
.flags = USE_TRANSPORT_ID,
},
{
.type = MEDIA_GET_STATUS,
.namespace = NS_MEDIA,
.payload = "{'type':'GET_STATUS','requestId':%d}",
.flags = USE_TRANSPORT_ID | USE_REQUEST_ID_ONLY,
},
{
.type = MEDIA_STATUS,
.tag = "MEDIA_STATUS",
},
{
.type = MEDIA_LOAD,
.namespace = NS_MEDIA,
.payload = "{'currentTime':0,'media':{'contentId':'%s','streamType':'LIVE','contentType':'audio/mp3'},'customData':{},'sessionId':'%s','requestId':%d,'type':'LOAD','autoplay':1}",
.flags = USE_TRANSPORT_ID | USE_REQUEST_ID,
},
{
.type = MEDIA_PLAY,
.namespace = NS_MEDIA,
.payload = "{'mediaSessionId':%d,'sessionId':'%s','type':'PLAY','requestId':%d}",
.flags = USE_TRANSPORT_ID | USE_REQUEST_ID,
},
{
.type = MEDIA_PAUSE,
.namespace = NS_MEDIA,
.payload = "{'mediaSessionId':%d,'sessionId':'%s','type':'PAUSE','requestId':%d}",
.flags = USE_TRANSPORT_ID | USE_REQUEST_ID,
},
{
.type = MEDIA_STOP,
.namespace = NS_MEDIA,
.payload = "{'mediaSessionId':%d,'sessionId':'%s','type':'STOP','requestId':%d}",
.flags = USE_TRANSPORT_ID | USE_REQUEST_ID,
},
{
.type = MEDIA_LOAD_FAILED,
.tag = "LOAD_FAILED",
},
{
.type = SET_VOLUME,
.namespace = NS_RECEIVER,
.payload = "{'type':'SET_VOLUME','volume':{'level':%.2f,'muted':0},'requestId':%d}",
.flags = USE_REQUEST_ID,
},
{
.type = 0,
},
};
/* From player.c */
extern struct event_base *evbase_player;
/* Globals */
static gnutls_certificate_credentials_t tls_credentials;
static struct cast_session *sessions;
static struct event *flush_timer;
static int
tcp_connect(const char *address, unsigned int port, int family)
{
union sockaddr_all sa;
int fd;
int len;
int ret;
// TODO Open non-block right away so we don't block the player while connecting
// and during TLS handshake (we would probably need to introduce a deferredev)
fd = socket(family, SOCK_STREAM | SOCK_CLOEXEC, 0);
if (fd < 0)
{
DPRINTF(E_LOG, L_CAST, "Could not create socket: %s\n", strerror(errno));
return -1;
}
switch (family)
{
case AF_INET:
sa.sin.sin_port = htons(port);
ret = inet_pton(AF_INET, address, &sa.sin.sin_addr);
len = sizeof(sa.sin);
break;
case AF_INET6:
sa.sin6.sin6_port = htons(port);
ret = inet_pton(AF_INET6, address, &sa.sin6.sin6_addr);
len = sizeof(sa.sin6);
break;
default:
DPRINTF(E_WARN, L_CAST, "Unknown family %d\n", family);
close(fd);
return -1;
}
if (ret <= 0)
{
DPRINTF(E_LOG, L_CAST, "Device address not valid (%s)\n", address);
close(fd);
return -1;
}
sa.ss.ss_family = family;
ret = connect(fd, &sa.sa, len);
if (ret < 0)
{
DPRINTF(E_LOG, L_CAST, "connect() to [%s]:%u failed: %s\n", address, port, strerror(errno));
close(fd);
return -1;
}
return fd;
}
static void
tcp_close(int fd)
{
/* no more receptions */
shutdown(fd, SHUT_RDWR);
close(fd);
}
static int
stream_url_make(char *out, size_t len, const char *peer_addr, int family)
{
struct ifaddrs *ifap;
struct ifaddrs *ifa;
union sockaddr_all haddr;
union sockaddr_all hmask;
union sockaddr_all paddr;
char host_addr[128];
unsigned short port;
int found;
int ret;
if (family == AF_INET)
ret = inet_pton(AF_INET, peer_addr, &paddr.sin.sin_addr);
else
ret = inet_pton(AF_INET6, peer_addr, &paddr.sin6.sin6_addr);
if (ret != 1)
return -1;
found = 0;
getifaddrs(&ifap);
for (ifa = ifap; !found && ifa; ifa = ifa->ifa_next)
{
if (ifa->ifa_addr->sa_family != family)
continue;
if (family == AF_INET)
{
memcpy(&haddr.sin, ifa->ifa_addr, sizeof(struct sockaddr_in));
memcpy(&hmask.sin, ifa->ifa_netmask, sizeof(struct sockaddr_in));
found = ((haddr.sin.sin_addr.s_addr & hmask.sin.sin_addr.s_addr) ==
(paddr.sin.sin_addr.s_addr & hmask.sin.sin_addr.s_addr));
if (found)
inet_ntop(family, &haddr.sin.sin_addr, host_addr, sizeof(host_addr));
}
else if (family == AF_INET6)
{
memcpy(&haddr.sin6, ifa->ifa_addr, sizeof(struct sockaddr_in6));
found = (memcmp(&haddr.sin6.sin6_addr.s6_addr, &paddr.sin6.sin6_addr.s6_addr, 8) == 0);
if (found)
inet_ntop(family, &haddr.sin6.sin6_addr, host_addr, sizeof(host_addr));
}
}
freeifaddrs(ifap);
if (!found)
return -1;
port = cfg_getint(cfg_getsec(cfg, "library"), "port");
snprintf(out, len, "http://%s:%d/stream.mp3", host_addr, port);
return 0;
}
static char *
squote_to_dquote(char *buf)
{
char *ptr;
for (ptr = buf; *ptr != '\0'; ptr++)
if (*ptr == '\'')
*ptr = '"';
return buf;
}
/*static char *
copy_tag_value(const char *json, const char *key)
{
char full_key[MAX_BUF];
char *ptr;
char *end;
char *out;
int len;
//TODO check return
snprintf(full_key, sizeof(full_key), "\"%s\":", key);
ptr = strstr(json, full_key);
if (!ptr)
return NULL;
len = strlen(json);
// Advance ptr from beginning of key to beginning of value (first " after key)
for (ptr = ptr + strlen(full_key); (ptr - json < len - 1) && (*ptr != '"') && (*ptr != '\0'); ptr++);
if (*ptr != '"')
return NULL;
ptr++;
for (end = ptr + 1; (end - json < len - 1) && (*end != '"') && (*end != '\0'); end++);
if (*end != '"')
return NULL;
// If value is for instance "test", ptr will now be t and end will be "
len = (end - ptr);
out = calloc(1, len + 1);
if (!out)
return NULL;
memcpy(out, ptr, len);
printf("Value is %s\n", out);
return out;
}*/
static int
cast_msg_send(struct cast_session *cs, enum cast_msg_types type, cast_reply_cb reply_cb)
{
Extensions__CoreApi__CastChannel__CastMessage msg = EXTENSIONS__CORE_API__CAST_CHANNEL__CAST_MESSAGE__INIT;
char msg_buf[MAX_BUF];
uint8_t buf[MAX_BUF];
uint32_t be;
size_t len;
int ret;
DPRINTF(E_DBG, L_CAST, "Preparing to send message type %d to %s\n", type, cs->devname);
msg.source_id = "sender-0";
msg.namespace_ = cast_msg[type].namespace;
if ((cast_msg[type].flags & USE_TRANSPORT_ID) && !cs->transport_id)
{
DPRINTF(E_LOG, L_CAST, "Error, didn't get transportId for message (type %d) to '%s'\n", type, cs->devname);
return -1;
}
if (cast_msg[type].flags & USE_TRANSPORT_ID)
msg.destination_id = cs->transport_id;
else
msg.destination_id = "receiver-0";
if (cast_msg[type].flags & (USE_REQUEST_ID | USE_REQUEST_ID_ONLY))
{
cs->request_id++;
if (reply_cb)
cs->callback_register[cs->request_id % CALLBACK_REGISTER_SIZE] = reply_cb;
}
// Special handling of some message types
if (cast_msg[type].flags & USE_REQUEST_ID_ONLY)
snprintf(msg_buf, sizeof(msg_buf), cast_msg[type].payload, cs->request_id);
else if (type == MEDIA_LOAD)
snprintf(msg_buf, sizeof(msg_buf), cast_msg[type].payload, cs->stream_url, cs->session_id, cs->request_id);
else if ((type == MEDIA_PLAY) || (type == MEDIA_PAUSE) || (type == MEDIA_STOP))
snprintf(msg_buf, sizeof(msg_buf), cast_msg[type].payload, cs->media_session_id, cs->session_id, cs->request_id);
else if (type == SET_VOLUME)
snprintf(msg_buf, sizeof(msg_buf), cast_msg[type].payload, cs->volume, cs->request_id);
else
snprintf(msg_buf, sizeof(msg_buf), "%s", cast_msg[type].payload);
squote_to_dquote(msg_buf);
msg.payload_utf8 = msg_buf;
len = extensions__core_api__cast_channel__cast_message__get_packed_size(&msg);
if (len <= 0)
{
DPRINTF(E_LOG, L_CAST, "Could not send message (type %d), invalid length: %d\n", type, len);
return -1;
}
// The message must be prefixed with Big-Endian 32 bit length
be = htobe32(len);
memcpy(buf, &be, 4);
// Now add the packed message and send it
extensions__core_api__cast_channel__cast_message__pack(&msg, buf + 4);
ret = gnutls_record_send(cs->tls_session, buf, len + 4);
if (ret < 0)
{
DPRINTF(E_LOG, L_CAST, "Could not send message, TLS error\n");
return -1;
}
else if (ret != len + 4)
{
DPRINTF(E_LOG, L_CAST, "BUG! Message partially sent, and we are not able to send the rest\n");
return -1;
}
DPRINTF(E_DBG, L_CAST, "TX %d %s %s %s %s\n", len, msg.source_id, msg.destination_id, msg.namespace_, msg.payload_utf8);
return 0;
}
static void *
cast_msg_parse(struct cast_msg_payload *payload, char *s)
{
json_object *haystack;
json_object *somehay;
json_object *needle;
const char *val;
int i;
haystack = json_tokener_parse(s);
if (!haystack)
{
DPRINTF(E_LOG, L_CAST, "JSON parser returned an error\n");
return NULL;
}
payload->type = UNKNOWN;
if (json_object_object_get_ex(haystack, "type", &needle))
{
val = json_object_get_string(needle);
for (i = 1; cast_msg[i].type; i++)
{
if (cast_msg[i].tag && (strcmp(val, cast_msg[i].tag) == 0))
{
payload->type = cast_msg[i].type;
break;
}
}
}
if (json_object_object_get_ex(haystack, "requestId", &needle))
payload->request_id = json_object_get_int(needle);
// Might be done now
if ((payload->type != RECEIVER_STATUS) && (payload->type != MEDIA_STATUS))
return haystack;
// Isn't this marvelous
if ( json_object_object_get_ex(haystack, "status", &needle) &&
(json_object_get_type(needle) == json_type_array) &&
(somehay = json_object_array_get_idx(needle, 0)) &&
json_object_object_get_ex(somehay, "mediaSessionId", &needle) &&
(json_object_get_type(needle) == json_type_int) )
payload->media_session_id = json_object_get_int(needle);
if ( ! (json_object_object_get_ex(haystack, "status", &somehay) &&
json_object_object_get_ex(somehay, "applications", &needle) &&
(json_object_get_type(needle) == json_type_array) &&
(somehay = json_object_array_get_idx(needle, 0))) )
return haystack;
if ( json_object_object_get_ex(somehay, "sessionId", &needle) &&
(json_object_get_type(needle) == json_type_string) )
payload->session_id = json_object_get_string(needle);
if ( json_object_object_get_ex(somehay, "transportId", &needle) &&
(json_object_get_type(needle) == json_type_string) )
payload->transport_id = json_object_get_string(needle);
return haystack;
}
static void
cast_msg_parse_free(void *haystack)
{
if (json_object_put((json_object *)haystack) != 1)
DPRINTF(E_LOG, L_CAST, "Memleak: JSON parser did not free object\n");
}
static void
cast_msg_process(struct cast_session *cs, const uint8_t *data, size_t len)
{
Extensions__CoreApi__CastChannel__CastMessage *reply;
struct cast_msg_payload payload = { 0 };
void *hdl;
int i;
reply = extensions__core_api__cast_channel__cast_message__unpack(NULL, len, data);
if (!reply)
{
DPRINTF(E_LOG, L_CAST, "Could not unpack message!\n");
return;
}
DPRINTF(E_DBG, L_CAST, "RX %d %s %s %s %s\n", len, reply->source_id, reply->destination_id, reply->namespace_, reply->payload_utf8);
hdl = cast_msg_parse(&payload, reply->payload_utf8);
if (!hdl)
{
DPRINTF(E_DBG, L_CAST, "Could not parse message: %s\n", reply->payload_utf8);
goto out_free_unpacked;
}
if (payload.type == PING)
{
cast_msg_send(cs, PONG, NULL);
goto out_free_parsed;
}
if (payload.type == UNKNOWN)
goto out_free_parsed;
// TODO: UPDATE SESSION STATUS AND READ BROADCASTS
i = payload.request_id % CALLBACK_REGISTER_SIZE;
if (payload.request_id && cs->callback_register[i])
{
cs->callback_register[i](cs, &payload);
cs->callback_register[i] = NULL;
goto out_free_parsed;
}
out_free_parsed:
cast_msg_parse_free(hdl);
out_free_unpacked:
extensions__core_api__cast_channel__cast_message__free_unpacked(reply, NULL);
}
static void
cast_session_free(struct cast_session *cs)
{
event_free(cs->ev);
// TODO How will this work if device disconnected?
gnutls_bye(cs->tls_session, GNUTLS_SHUT_RDWR);
close(cs->server_fd);
gnutls_deinit(cs->tls_session);
if (cs->address)
free(cs->address);
if (cs->devname)
free(cs->devname);
if (cs->session_id)
free(cs->session_id);
if (cs->transport_id)
free(cs->transport_id);
free(cs->output_session);
free(cs);
}
static void
cast_session_cleanup(struct cast_session *cs)
{
struct cast_session *s;
if (cs == sessions)
sessions = sessions->next;
else
{
for (s = sessions; s && (s->next != cs); s = s->next)
; /* EMPTY */
if (!s)
DPRINTF(E_WARN, L_CAST, "WARNING: struct cast_session not found in list; BUG!\n");
else
s->next = cs->next;
}
cast_session_free(cs);
}
static void
cast_session_failure(struct cast_session *cs)
{
// Session failed, let our user know
cs->status_cb(cs->device, cs->output_session, OUTPUT_STATE_FAILED);
cast_session_cleanup(cs);
}
static void
cast_cb_startup_volume(struct cast_session *cs, struct cast_msg_payload *payload)
{
output_status_cb status_cb;
cs->state = OUTPUT_STATE_CONNECTED;
/* Session startup and setup is done, tell our user */
DPRINTF(E_DBG, L_CAST, "Session ready\n");
status_cb = cs->status_cb;
cs->status_cb = NULL;
status_cb(cs->device, cs->output_session, cs->state);
}
static void
cast_cb_startup_media(struct cast_session *cs, struct cast_msg_payload *payload)
{
int ret;
if (payload->type != MEDIA_STATUS)
{
DPRINTF(E_LOG, L_CAST, "No receiver status or transport id?\n");
cast_msg_send(cs, CLOSE, NULL);
cast_session_failure(cs);
return;
}
// TODO Send a volume message with the cb
ret = cast_msg_send(cs, SET_VOLUME, cast_cb_startup_volume);
if (ret < 0)
{
cast_msg_send(cs, CLOSE, NULL);
cast_session_failure(cs);
}
}
static void
cast_cb_startup_launch(struct cast_session *cs, struct cast_msg_payload *payload)
{
int ret;
if (payload->type != RECEIVER_STATUS || !payload->transport_id)
{
DPRINTF(E_LOG, L_CAST, "No receiver status or transport id?\n");
cast_msg_send(cs, CLOSE, NULL);
cast_session_failure(cs);
return;
}
if (cs->transport_id)
DPRINTF(E_LOG, L_CAST, "Ooops, memleaking...\n");
cs->transport_id = strdup(payload->transport_id);
ret = cast_msg_send(cs, MEDIA_CONNECT, NULL);
if (ret == 0)
ret = cast_msg_send(cs, MEDIA_GET_STATUS, cast_cb_startup_media);
if (ret < 0)
{
cast_msg_send(cs, CLOSE, NULL);
cast_session_failure(cs);
}
}
static void
cast_cb_startup_connect(struct cast_session *cs, struct cast_msg_payload *payload)
{
int ret;
if (payload->type != RECEIVER_STATUS || !payload->session_id)
{
DPRINTF(E_LOG, L_CAST, "No receiver status or session id? (type: %d, id: %s)\n", payload->type, payload->session_id);
cast_msg_send(cs, CLOSE, NULL);
cast_session_failure(cs);
return;
}
if (cs->session_id)
DPRINTF(E_LOG, L_CAST, "Ooops, memleaking...\n");
cs->session_id = strdup(payload->session_id);
ret = cast_msg_send(cs, LAUNCH, cast_cb_startup_launch);
if (ret < 0)
{
cast_msg_send(cs, CLOSE, NULL);
cast_session_failure(cs);
}
}
// TODO Not really a cb right now
static void
cast_cb_close(struct cast_session *cs, struct cast_msg_payload *payload)
{
output_status_cb status_cb;
cs->state = OUTPUT_STATE_STOPPED;
/* Session shut down, tell our user */
status_cb = cs->status_cb;
cs->status_cb = NULL;
status_cb(cs->device, cs->output_session, cs->state);
cast_session_cleanup(cs);
}
static void
cast_cb_load(struct cast_session *cs, struct cast_msg_payload *payload)
{
if (payload->type == MEDIA_LOAD_FAILED)
{
DPRINTF(E_LOG, L_CAST, "The device %s could not start playback\n", cs->devname);
cast_msg_send(cs, CLOSE, NULL);
cast_session_failure(cs);
return;
}
if (!payload->media_session_id)
DPRINTF(E_LOG, L_CAST, "Did not get a media session id?\n");
else
cs->media_session_id = payload->media_session_id;
cs->state = OUTPUT_STATE_STREAMING;
DPRINTF(E_DBG, L_CAST, "Media loaded\n");
cs->status_cb(cs->device, cs->output_session, cs->state);
}
static void
cast_cb_stop(struct cast_session *cs, struct cast_msg_payload *payload)
{
output_status_cb status_cb;
cs->state = OUTPUT_STATE_CONNECTED;
status_cb = cs->status_cb;
cs->status_cb = NULL;
status_cb(cs->device, cs->output_session, cs->state);
//TODO
}
static void
cast_cb_volume(struct cast_session *cs, struct cast_msg_payload *payload)
{
output_status_cb status_cb;
status_cb = cs->status_cb;
cs->status_cb = NULL;
status_cb(cs->device, cs->output_session, cs->state);
}
static void
cast_cb_flush(struct cast_session *cs, struct cast_msg_payload *payload)
{
output_status_cb status_cb;
DPRINTF(E_DBG, L_CAST, "Cast CB flush called\n");
cs->state = OUTPUT_STATE_CONNECTED;
/* Let our user know */
status_cb = cs->status_cb;
cs->status_cb = NULL;
status_cb(cs->device, cs->output_session, cs->state);
}
static void
cast_listen_cb(int fd, short what, void *arg)
{
struct cast_session *cs;
uint8_t buffer[MAX_BUF + 1]; // Not sure about the +1, but is copied from gnutls examples
uint32_t be;
size_t len;
int received;
int ret;
cs = (struct cast_session *)arg;
DPRINTF(E_DBG, L_CAST, "New data from %s\n", cs->devname);
received = 0;
while ((ret = gnutls_record_recv(cs->tls_session, buffer + received, MAX_BUF - received)) > 0)
{
DPRINTF(E_DBG, L_CAST, "Received %d bytes\n", ret);
if (ret == 4)
{
memcpy(&be, buffer, 4);
len = be32toh(be);
DPRINTF(E_DBG, L_CAST, "Incoming %d bytes\n", len);
}
else
{
received += ret;
}
if (received >= MAX_BUF)
{
DPRINTF(E_LOG, L_CAST, "Receive buffer exhausted!\n");
cast_session_failure(cs);
return;
}
}
if ((ret != GNUTLS_E_INTERRUPTED) && (ret != GNUTLS_E_AGAIN))
{
DPRINTF(E_LOG, L_CAST, "Session error: %s\n", gnutls_strerror(ret));
cast_session_failure(cs);
return;
}
if (received)
cast_msg_process(cs, buffer, received);
}
static struct cast_session *
cast_session_make(struct output_device *device, int family, output_status_cb cb)
{
struct output_session *os;
struct cast_session *cs;
const char *proto;
const char *err;
char *address;
unsigned short port;
int flags;
int ret;
switch (family)
{
case AF_INET:
/* We always have the v4 services, so no need to check */
if (!device->v4_address)
return NULL;
address = device->v4_address;
port = device->v4_port;
break;
case AF_INET6:
if (!device->v6_address)
return NULL;
address = device->v6_address;
port = device->v6_port;
break;
default:
return NULL;
}
os = calloc(1, sizeof(struct output_session));
cs = calloc(1, sizeof(struct cast_session));
if (!os || !cs)
{
DPRINTF(E_LOG, L_CAST, "Out of memory for TLS session\n");
return NULL;
}
os->session = cs;
os->type = device->type;
cs->output_session = os;
cs->state = OUTPUT_STATE_STOPPED;
cs->device = device;
cs->status_cb = cb;
/* Init TLS session, use default priorities and put the x509 credentials to the current session */
if ( ((ret = gnutls_init(&cs->tls_session, GNUTLS_CLIENT)) != GNUTLS_E_SUCCESS) ||
((ret = gnutls_priority_set_direct(cs->tls_session, "PERFORMANCE", &err)) != GNUTLS_E_SUCCESS) ||
((ret = gnutls_credentials_set(cs->tls_session, GNUTLS_CRD_CERTIFICATE, tls_credentials)) != GNUTLS_E_SUCCESS) )
{
DPRINTF(E_LOG, L_CAST, "Could not initialize GNUTLS session: %s\n", gnutls_strerror(ret));
goto out_free_session;
}
cs->server_fd = tcp_connect(address, port, family);
if (cs->server_fd < 0)
{
DPRINTF(E_LOG, L_CAST, "Could not connect to %s\n", device->name);
goto out_deinit_gnutls;
}
ret = stream_url_make(cs->stream_url, sizeof(cs->stream_url), address, family);
if (ret < 0)
{
DPRINTF(E_LOG, L_CAST, "Bug! Could find a network interface on same subnet as %s\n", device->name);
goto out_close_connection;
}
// TODO Add a timeout to detect connection problems
cs->ev = event_new(evbase_player, cs->server_fd, EV_READ | EV_PERSIST, cast_listen_cb, cs);
if (!cs->ev)
{
DPRINTF(E_LOG, L_CAST, "Out of memory for listener event\n");
goto out_close_connection;
}
gnutls_transport_set_ptr(cs->tls_session, (gnutls_transport_ptr_t)cs->server_fd);
ret = gnutls_handshake(cs->tls_session);
if (ret != GNUTLS_E_SUCCESS)
{
DPRINTF(E_LOG, L_CAST, "Could not attach TLS to TCP connection: %s\n", gnutls_strerror(ret));
goto out_free_ev;
}
flags = fcntl(cs->server_fd, F_GETFL, 0);
fcntl(cs->server_fd, F_SETFL, flags | O_NONBLOCK);
event_add(cs->ev, NULL);
cs->devname = strdup(device->name);
cs->address = strdup(address);
cs->volume = 0.01 * device->volume;
cs->next = sessions;
sessions = cs;
proto = gnutls_protocol_get_name(gnutls_protocol_get_version(cs->tls_session));
DPRINTF(E_INFO, L_CAST, "Connection to %s established using %s\n", cs->devname, proto);
return cs;
out_free_ev:
event_free(cs->ev);
out_close_connection:
tcp_close(cs->server_fd);
out_deinit_gnutls:
gnutls_deinit(cs->tls_session);
out_free_session:
free(cs);
return NULL;
}
static int
cast_device_start(struct output_device *device, output_status_cb cb, uint64_t rtptime);
static void
cast_device_cb(const char *name, const char *type, const char *domain, const char *hostname, int family, const char *address, int port, struct keyval *txt)
{
struct output_device *device;
const char *p;
uint32_t id;
p = keyval_get(txt, "id");
if (p)
id = djb_hash(p, strlen(p));
else
id = 0;
if (!id)
{
DPRINTF(E_LOG, L_PLAYER, "Could not extract ChromeCast device ID (%s)\n", name);
return;
}
DPRINTF(E_DBG, L_PLAYER, "Event for Chromecast device %s (port %d, id %" PRIu32 ")\n", name, port, id);
device = calloc(1, sizeof(struct output_device));
if (!device)
{
DPRINTF(E_LOG, L_PLAYER, "Out of memory for new Chromecast device\n");
return;
}
device->id = id;
device->name = strdup(name);
device->type = OUTPUT_TYPE_CAST;
device->type_name = outputs_name(device->type);
if (port < 0)
{
/* Device stopped advertising */
switch (family)
{
case AF_INET:
device->v4_port = 1;
break;
case AF_INET6:
device->v6_port = 1;
break;
}
player_device_remove(device);
return;
}
DPRINTF(E_INFO, L_PLAYER, "Adding Chromecast device %s\n", name);
device->advertised = 1;
switch (family)
{
case AF_INET:
device->v4_address = strdup(address);
device->v4_port = port;
break;
case AF_INET6:
device->v6_address = strdup(address);
device->v6_port = port;
break;
}
player_device_add(device);
}
static int
cast_device_start(struct output_device *device, output_status_cb cb, uint64_t rtptime)
{
struct cast_session *cs;
int ret;
DPRINTF(E_LOG, L_CAST, "Got start request for %s\n", device->name);
cs = cast_session_make(device, AF_INET6, cb);
if (cs)
{
ret = cast_msg_send(cs, CONNECT, NULL);
if (ret == 0)
{
cast_msg_send(cs, GET_STATUS, cast_cb_startup_connect);
return 0;
}
else
{
DPRINTF(E_WARN, L_CAST, "Could not send CONNECT request on IPv6 (start)\n");
cast_session_cleanup(cs);
}
}
cs = cast_session_make(device, AF_INET, cb);
if (!cs)
return -1;
ret = cast_msg_send(cs, CONNECT, NULL);
if (ret < 0)
{
DPRINTF(E_LOG, L_CAST, "Could not send CONNECT request on IPv4 (start)\n");
cast_session_cleanup(cs);
return -1;
}
// TODO Check return value
cast_msg_send(cs, GET_STATUS, cast_cb_startup_connect);
return 0;
}
static void
cast_device_stop(struct output_session *session)
{
struct cast_session *cs = session->session;
if (!(cs->state & OUTPUT_STATE_F_CONNECTED))
{
cast_session_cleanup(cs);
return;
}
cast_msg_send(cs, CLOSE, NULL);
cast_cb_close(cs, NULL);
}
static int
cast_volume_set(struct output_device *device, output_status_cb cb)
{
struct cast_session *cs;
int ret;
if (!device->session || !device->session->session)
return 0;
cs = device->session->session;
if (!(cs->state & OUTPUT_STATE_F_CONNECTED))
return 0;
cs->volume = 0.01 * device->volume;
ret = cast_msg_send(cs, SET_VOLUME, cast_cb_volume);
if (ret < 0)
{
cast_session_failure(cs);
return 0;
}
cs->status_cb = cb;
return 1;
}
static void
cast_playback_start(uint64_t next_pkt, struct timespec *ts)
{
struct cast_session *cs;
if (evtimer_pending(flush_timer, NULL))
event_del(flush_timer);
for (cs = sessions; cs; cs = cs->next)
{
if (cs->state == OUTPUT_STATE_CONNECTED)
cast_msg_send(cs, MEDIA_LOAD, cast_cb_load);
}
}
static void
cast_playback_stop(void)
{
struct cast_session *cs;
int ret;
for (cs = sessions; cs; cs = cs->next)
{
ret = cast_msg_send(cs, MEDIA_STOP, cast_cb_stop);
if (ret < 0)
DPRINTF(E_LOG, L_CAST, "MEDIA_STOP request failed!\n");
}
}
static void
cast_flush_timer_cb(int fd, short what, void *arg)
{
DPRINTF(E_DBG, L_CAST, "Flush timer expired; tearing down all sessions\n");
cast_playback_stop();
}
static int
cast_flush(output_status_cb cb, uint64_t rtptime)
{
struct cast_session *cs;
struct cast_session *next;
struct timeval tv;
int pending;
int ret;
pending = 0;
for (cs = sessions; cs; cs = next)
{
next = cs->next;
if (cs->state != OUTPUT_STATE_STREAMING)
continue;
ret = cast_msg_send(cs, MEDIA_PAUSE, cast_cb_flush);
if (ret < 0)
{
cast_session_failure(cs);
continue;
}
cs->status_cb = cb;
pending++;
}
if (pending > 0)
{
evutil_timerclear(&tv);
tv.tv_sec = 10;
evtimer_add(flush_timer, &tv);
}
return pending;
}
static void
cast_set_status_cb(struct output_session *session, output_status_cb cb)
{
struct cast_session *cs = session->session;
cs->status_cb = cb;
}
static int
cast_init(void)
{
int mdns_flags;
int i;
int ret;
// Sanity check
for (i = 1; cast_msg[i].type; i++)
{
if (cast_msg[i].type != i)
{
DPRINTF(E_LOG, L_CAST, "BUG! Cast messages and types are misaligned (type %d!=%d). Could not initialize.\n", cast_msg[i].type, i);
return -1;
}
}
// TODO Setting the cert file may not be required
if ( ((ret = gnutls_global_init()) != GNUTLS_E_SUCCESS) ||
((ret = gnutls_certificate_allocate_credentials(&tls_credentials)) != GNUTLS_E_SUCCESS) ||
((ret = gnutls_certificate_set_x509_trust_file(tls_credentials, CAFILE, GNUTLS_X509_FMT_PEM)) < 0) )
{
DPRINTF(E_LOG, L_CAST, "Could not initialize GNUTLS: %s\n", gnutls_strerror(ret));
return -1;
}
flush_timer = evtimer_new(evbase_player, cast_flush_timer_cb, NULL);
if (!flush_timer)
{
DPRINTF(E_LOG, L_CAST, "Out of memory for flush timer\n");
goto out_tls_deinit;
}
mdns_flags = MDNS_WANT_V4 | MDNS_WANT_V6 | MDNS_WANT_V6LL;
ret = mdns_browse("_googlecast._tcp", mdns_flags, cast_device_cb);
if (ret < 0)
{
DPRINTF(E_LOG, L_PLAYER, "Could not add mDNS browser for Chromecast devices\n");
goto out_free_flush_timer;
}
return 0;
out_free_flush_timer:
event_free(flush_timer);
out_tls_deinit:
gnutls_certificate_free_credentials(tls_credentials);
gnutls_global_deinit();
return -1;
}
static void
cast_deinit(void)
{
struct cast_session *cs;
for (cs = sessions; sessions; cs = sessions)
{
sessions = cs->next;
cast_session_free(cs);
}
event_free(flush_timer);
gnutls_certificate_free_credentials(tls_credentials);
gnutls_global_deinit();
}
struct output_definition output_cast =
{
.name = "Chromecast",
.type = OUTPUT_TYPE_CAST,
.priority = 2,
.disabled = 0,
.init = cast_init,
.deinit = cast_deinit,
.device_start = cast_device_start,
.device_stop = cast_device_stop,
// .device_probe = cast_device_probe,
// .device_free_extra is unset - nothing to free
.device_volume_set = cast_volume_set,
.playback_start = cast_playback_start,
.playback_stop = cast_playback_stop,
// .write is unset - we don't write, the Chromecast will read our mp3 stream
.flush = cast_flush,
.status_cb = cast_set_status_cb,
/* .metadata_prepare = cast_metadata_prepare,
.metadata_send = cast_metadata_send,
.metadata_purge = cast_metadata_purge,
.metadata_prune = cast_metadata_prune,
*/
};
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