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rtsp.c
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rtsp.c
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/*
* RTSP protocol handler. This file is part of Shairport Sync
* Copyright (c) James Laird 2013
* Modifications associated with audio synchronization, multithreading and
* metadata handling copyright (c) Mike Brady 2014-2024
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <ifaddrs.h>
#include <inttypes.h>
#include <limits.h>
#include <memory.h>
#include <net/if.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <poll.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include "activity_monitor.h"
#include "config.h"
#ifdef CONFIG_OPENSSL
#include <openssl/evp.h>
#endif
#ifdef CONFIG_MBEDTLS
#include <mbedtls/md5.h>
#include <mbedtls/version.h>
#endif
#ifdef CONFIG_POLARSSL
#include <polarssl/md5.h>
#endif
#include "common.h"
#include "player.h"
#include "rtp.h"
#include "rtsp.h"
#ifdef CONFIG_METADATA_HUB
#include "metadata_hub.h"
#endif
#ifdef CONFIG_MQTT
#include "mqtt.h"
#endif
#ifdef AF_INET6
#define INETx_ADDRSTRLEN INET6_ADDRSTRLEN
#else
#define INETx_ADDRSTRLEN INET_ADDRSTRLEN
#endif
#ifdef CONFIG_AIRPLAY_2
#include "pair_ap/pair.h"
#include "plist/plist.h"
#include "plist_xml_strings.h"
#include "ptp-utilities.h"
#ifdef HAVE_LIBPLIST_GE_2_3_0
#define plist_from_memory(plist_data, length, plist) \
plist_from_memory((plist_data), (length), (plist), NULL)
#endif
#endif
#ifdef CONFIG_DBUS_INTERFACE
#include "dbus-service.h"
#endif
#include "mdns.h"
// mDNS advertisement strings
// Create these strings and then keep them updated.
// When necessary, update the mDNS service records, using e.g. Avahi
// from these sources.
char *txt_records[64];
char *secondary_txt_records[64];
char firmware_version[64];
char ap1_featuresString[64];
char pkString[128];
#ifdef CONFIG_AIRPLAY_2
char deviceIdString[64];
char featuresString[64];
char statusflagsString[32];
char piString[128];
char gidString[128];
#endif
#define METADATA_SNDBUF (4 * 1024 * 1024)
enum rtsp_read_request_response {
rtsp_read_request_response_ok,
rtsp_read_request_response_immediate_shutdown_requested,
rtsp_read_request_response_bad_packet,
rtsp_read_request_response_channel_closed,
rtsp_read_request_response_read_error,
rtsp_read_request_response_error
};
static int nconns = 0; // i.e. the size if the conns array
rtsp_conn_info *principal_conn;
rtsp_conn_info **conns;
int metadata_running = 0;
// always lock this when accessing the principal conn value
// use a read lock when consulting and holding it
// use a write lock if you want to change it
pthread_rwlock_t principal_conn_lock = PTHREAD_RWLOCK_INITIALIZER;
// always lock this when accessing the list of connection threads
pthread_mutex_t conns_lock = PTHREAD_MUTEX_INITIALIZER;
// every time we want to retain or release a reference count, lock it with this
// if a reference count is read as zero, it means the it's being deallocated.
static pthread_mutex_t reference_counter_lock = PTHREAD_MUTEX_INITIALIZER;
// only one thread is allowed to use the player at once.
// it monitors the request variable (at least when interrupted)
// static pthread_mutex_t playing_mutex = PTHREAD_MUTEX_INITIALIZER;
// static int please_shutdown = 0;
// static pthread_t playing_thread = 0;
int RTSP_connection_index = 1;
#ifdef CONFIG_METADATA
typedef struct {
pthread_mutex_t pc_queue_lock;
pthread_cond_t pc_queue_item_added_signal;
pthread_cond_t pc_queue_item_removed_signal;
char *name;
size_t item_size; // number of bytes in each item
uint32_t count; // number of items in the queue
uint32_t capacity; // maximum number of items
uint32_t toq; // first item to take
uint32_t eoq; // free space at end of queue
void *items; // a pointer to where the items are actually stored
} pc_queue; // producer-consumer queue
#endif
static int msg_indexes = 1;
typedef struct {
int index_number;
uint32_t referenceCount; // we might start using this...
unsigned int nheaders;
char *name[16];
char *value[16];
uint32_t contentlength;
char *content;
// for requests
char method[16];
char path[256];
// for responses
int respcode;
} rtsp_message;
#ifdef CONFIG_AIRPLAY_2
int add_pstring_to_malloc(const char *s, void **allocation, size_t *size) {
int response = 0;
void *p = *allocation;
if (p == NULL) {
p = malloc(strlen(s) + 1);
if (p == NULL) {
debug(1, "error allocating memory");
} else {
*allocation = p;
*size = *size + strlen(s) + 1;
uint8_t *b = (uint8_t *)p;
*b = strlen(s);
p = p + 1;
memcpy(p, s, strlen(s));
response = 1;
}
} else {
p = realloc(p, *size + strlen(s) + 1);
if (p == NULL) { // assuming we never allocate a zero byte space
debug(1, "error reallocating memory");
} else {
*allocation = p;
uint8_t *b = (uint8_t *)p + *size;
*b = strlen(s);
p = p + *size + 1;
memcpy(p, s, strlen(s));
*size = *size + strlen(s) + 1;
response = 1;
}
}
return response;
}
static void pkString_make(char *str, size_t str_size, const char *device_id) {
uint8_t public_key[32];
if (str_size < 2 * sizeof(public_key) + 1) {
warn("Insufficient string size");
str[0] = '\0';
return;
}
pair_public_key_get(PAIR_SERVER_HOMEKIT, public_key, device_id);
char *ptr = str;
for (size_t i = 0; i < sizeof(public_key); i++)
ptr += sprintf(ptr, "%02x", public_key[i]);
}
#endif
#ifdef CONFIG_AIRPLAY_2
void build_bonjour_strings(rtsp_conn_info *conn) {
#else
void build_bonjour_strings(__attribute((unused)) rtsp_conn_info *conn) {
#endif
int entry_number = 0;
// make up a firmware version
#ifdef CONFIG_USE_GIT_VERSION_STRING
if (git_version_string[0] != '\0')
snprintf(firmware_version, sizeof(firmware_version), "fv=%s", git_version_string);
else
#endif
snprintf(firmware_version, sizeof(firmware_version), "fv=%s", PACKAGE_VERSION);
#ifdef CONFIG_AIRPLAY_2
uint64_t features_hi = config.airplay_features;
features_hi = (features_hi >> 32) & 0xffffffff;
uint64_t features_lo = config.airplay_features;
features_lo = features_lo & 0xffffffff;
snprintf(ap1_featuresString, sizeof(ap1_featuresString), "ft=0x%" PRIX64 ",0x%" PRIX64 "",
features_lo, features_hi);
snprintf(pkString, sizeof(pkString), "pk=");
pkString_make(pkString + strlen("pk="), sizeof(pkString) - strlen("pk="),
config.airplay_device_id);
txt_records[entry_number++] = "cn=0,1";
txt_records[entry_number++] = "da=true";
txt_records[entry_number++] = "et=0,1";
txt_records[entry_number++] = ap1_featuresString;
txt_records[entry_number++] = firmware_version;
#ifdef CONFIG_METADATA
if (config.get_coverart == 0)
txt_records[entry_number++] = "md=0,2";
else
txt_records[entry_number++] = "md=0,1,2";
#endif
txt_records[entry_number++] = "am=Shairport Sync";
txt_records[entry_number++] = "sf=0x4";
txt_records[entry_number++] = "tp=UDP";
txt_records[entry_number++] = "vn=65537";
txt_records[entry_number++] = "vs=366.0";
txt_records[entry_number++] = pkString;
txt_records[entry_number++] = NULL;
#else
// here, just replicate what happens in mdns.h when using those #defines
txt_records[entry_number++] = "sf=0x4";
txt_records[entry_number++] = firmware_version;
txt_records[entry_number++] = "am=ShairportSync";
txt_records[entry_number++] = "vs=105.1";
txt_records[entry_number++] = "tp=TCP,UDP";
txt_records[entry_number++] = "vn=65537";
#ifdef CONFIG_METADATA
if (config.get_coverart == 0)
txt_records[entry_number++] = "md=0,2";
else
txt_records[entry_number++] = "md=0,1,2";
#endif
txt_records[entry_number++] = "ss=16";
txt_records[entry_number++] = "sr=44100";
txt_records[entry_number++] = "da=true";
txt_records[entry_number++] = "sv=false";
txt_records[entry_number++] = "et=0,1";
txt_records[entry_number++] = "ek=1";
txt_records[entry_number++] = "cn=0,1";
txt_records[entry_number++] = "ch=2";
txt_records[entry_number++] = "txtvers=1";
if (config.password == 0)
txt_records[entry_number++] = "pw=false";
else
txt_records[entry_number++] = "pw=true";
txt_records[entry_number++] = NULL;
#endif
#ifdef CONFIG_AIRPLAY_2
// make up a secondary set of text records
entry_number = 0;
secondary_txt_records[entry_number++] = "srcvers=366.0";
snprintf(deviceIdString, sizeof(deviceIdString), "deviceid=%s", config.airplay_device_id);
secondary_txt_records[entry_number++] = deviceIdString;
snprintf(featuresString, sizeof(featuresString), "features=0x%" PRIX64 ",0x%" PRIX64 "",
features_lo, features_hi);
secondary_txt_records[entry_number++] = featuresString;
snprintf(statusflagsString, sizeof(statusflagsString), "flags=0x%" PRIX32,
config.airplay_statusflags);
secondary_txt_records[entry_number++] = statusflagsString;
secondary_txt_records[entry_number++] = "protovers=1.1";
secondary_txt_records[entry_number++] = "acl=0";
secondary_txt_records[entry_number++] = "rsf=0x0";
secondary_txt_records[entry_number++] = firmware_version;
secondary_txt_records[entry_number++] = "model=Shairport Sync";
snprintf(piString, sizeof(piString), "pi=%s", config.airplay_pi);
secondary_txt_records[entry_number++] = piString;
if ((conn != NULL) && (conn->airplay_gid != 0)) {
snprintf(gidString, sizeof(gidString), "gid=%s", conn->airplay_gid);
} else {
snprintf(gidString, sizeof(gidString), "gid=%s", config.airplay_pi);
}
secondary_txt_records[entry_number++] = gidString;
if ((conn != NULL) && (conn->groupContainsGroupLeader != 0))
secondary_txt_records[entry_number++] = "gcgl=1";
else
secondary_txt_records[entry_number++] = "gcgl=0";
if ((conn != NULL) && (conn->airplay_gid != 0)) // if it's in a group
secondary_txt_records[entry_number++] = "isGroupLeader=0";
secondary_txt_records[entry_number++] = pkString;
secondary_txt_records[entry_number++] = NULL;
#endif
}
#ifdef CONFIG_METADATA
typedef struct {
uint32_t type;
uint32_t code;
char *data;
uint32_t length;
rtsp_message *carrier;
} metadata_package;
void pc_queue_init(pc_queue *the_queue, char *items, size_t item_size, uint32_t number_of_items,
const char *name) {
if (name)
debug(2, "Creating metadata queue \"%s\".", name);
else
debug(1, "Creating an unnamed metadata queue.");
pthread_mutex_init(&the_queue->pc_queue_lock, NULL);
pthread_cond_init(&the_queue->pc_queue_item_added_signal, NULL);
pthread_cond_init(&the_queue->pc_queue_item_removed_signal, NULL);
the_queue->item_size = item_size;
the_queue->items = items;
the_queue->count = 0;
the_queue->capacity = number_of_items;
the_queue->toq = 0;
the_queue->eoq = 0;
if (name == NULL)
the_queue->name = NULL;
else
the_queue->name = strdup(name);
}
void pc_queue_delete(pc_queue *the_queue) {
if (the_queue->name)
debug(2, "Deleting metadata queue \"%s\".", the_queue->name);
else
debug(1, "Deleting an unnamed metadata queue.");
if (the_queue->name != NULL)
free(the_queue->name);
// debug(2, "destroying pc_queue_item_removed_signal");
pthread_cond_destroy(&the_queue->pc_queue_item_removed_signal);
// debug(2, "destroying pc_queue_item_added_signal");
pthread_cond_destroy(&the_queue->pc_queue_item_added_signal);
// debug(2, "destroying pc_queue_lock");
pthread_mutex_destroy(&the_queue->pc_queue_lock);
// debug(2, "destroying signals and locks done");
}
int send_metadata(uint32_t type, uint32_t code, char *data, uint32_t length, rtsp_message *carrier,
int block);
int send_ssnc_metadata(uint32_t code, char *data, uint32_t length, int block) {
return send_metadata('ssnc', code, data, length, NULL, block);
}
void pc_queue_cleanup_handler(void *arg) {
// debug(1, "pc_queue_cleanup_handler called.");
pc_queue *the_queue = (pc_queue *)arg;
int rc = pthread_mutex_unlock(&the_queue->pc_queue_lock);
if (rc)
debug(1, "Error unlocking for pc_queue_add_item or pc_queue_get_item.");
}
int pc_queue_add_item(pc_queue *the_queue, const void *the_stuff, int block) {
int response = 0;
int rc;
if (the_queue) {
if (block == 0) {
rc = debug_mutex_lock(&the_queue->pc_queue_lock, 10000, 2);
if (rc == EBUSY)
return EBUSY;
} else
rc = pthread_mutex_lock(&the_queue->pc_queue_lock);
if (rc)
debug(1, "Error %d (\"%s\") locking for pc_queue_add_item. Block is %d.", rc, strerror(rc),
block);
pthread_cleanup_push(pc_queue_cleanup_handler, (void *)the_queue);
// leave this out if you want this to return if the queue is already full
// irrespective of the block flag.
/*
while (the_queue->count == the_queue->capacity) {
rc = pthread_cond_wait(&the_queue->pc_queue_item_removed_signal,
&the_queue->pc_queue_lock); if (rc) debug(1, "Error waiting for item to be removed");
}
*/
if (the_queue->count < the_queue->capacity) {
uint32_t i = the_queue->eoq;
void *p = the_queue->items + the_queue->item_size * i;
// void * p = &the_queue->qbase + the_queue->item_size*the_queue->eoq;
memcpy(p, the_stuff, the_queue->item_size);
// update the pointer
i++;
if (i == the_queue->capacity)
// fold pointer if necessary
i = 0;
the_queue->eoq = i;
the_queue->count++;
// debug(2,"metadata queue+ \"%s\" %d/%d.", the_queue->name, the_queue->count,
// the_queue->capacity);
if (the_queue->count == the_queue->capacity)
debug(3, "metadata queue \"%s\": is now full with %d items in it!", the_queue->name,
the_queue->count);
rc = pthread_cond_signal(&the_queue->pc_queue_item_added_signal);
if (rc)
debug(1, "metadata queue \"%s\": error signalling after pc_queue_add_item",
the_queue->name);
} else {
response = EWOULDBLOCK; // a bit arbitrary, this.
debug(3,
"metadata queue \"%s\": is already full with %d items in it. Not adding this item to "
"the queue.",
the_queue->name, the_queue->count);
}
pthread_cleanup_pop(1); // unlock the queue lock.
} else {
debug(1, "Adding an item to a NULL queue");
}
return response;
}
int pc_queue_get_item(pc_queue *the_queue, void *the_stuff) {
int rc;
if (the_queue) {
rc = pthread_mutex_lock(&the_queue->pc_queue_lock);
if (rc)
debug(1, "metadata queue \"%s\": error locking for pc_queue_get_item", the_queue->name);
pthread_cleanup_push(pc_queue_cleanup_handler, (void *)the_queue);
while (the_queue->count == 0) {
rc = pthread_cond_wait(&the_queue->pc_queue_item_added_signal, &the_queue->pc_queue_lock);
if (rc)
debug(1, "metadata queue \"%s\": error waiting for item to be added", the_queue->name);
}
uint32_t i = the_queue->toq;
// void * p = &the_queue->qbase + the_queue->item_size*the_queue->toq;
void *p = the_queue->items + the_queue->item_size * i;
memcpy(the_stuff, p, the_queue->item_size);
// update the pointer
i++;
if (i == the_queue->capacity)
// fold pointer if necessary
i = 0;
the_queue->toq = i;
the_queue->count--;
debug(3, "metadata queue- \"%s\" %d/%d.", the_queue->name, the_queue->count,
the_queue->capacity);
rc = pthread_cond_signal(&the_queue->pc_queue_item_removed_signal);
if (rc)
debug(1, "metadata queue \"%s\": error signalling after pc_queue_get_item", the_queue->name);
pthread_cleanup_pop(1); // unlock the queue lock.
} else {
debug(1, "Removing an item from a NULL queue");
}
return 0;
}
#endif
// note: connection numbers start at 1, so an except_this_one value of zero means "all threads"
void cancel_all_RTSP_threads(airplay_stream_c stream_category, int except_this_one) {
// if the stream category is unspecified_stream_category
// all categories are elegible for cancellation
// otherwise just the category itself
debug_mutex_lock(&conns_lock, 1000000, 3);
int i;
for (i = 0; i < nconns; i++) {
if ((conns[i] != NULL) && (conns[i]->running != 0) &&
(conns[i]->connection_number != except_this_one) &&
((stream_category == unspecified_stream_category) ||
(stream_category == conns[i]->airplay_stream_category))) {
pthread_cancel(conns[i]->thread);
debug(1, "Connection %d: cancelled.", conns[i]->connection_number);
} else if (conns[i] != NULL) {
debug(1, "Connection %d: not cancelled.", conns[i]->connection_number);
}
}
for (i = 0; i < nconns; i++) {
if ((conns[i] != NULL) && (conns[i]->running != 0) &&
(conns[i]->connection_number != except_this_one) &&
((stream_category == unspecified_stream_category) ||
(stream_category == conns[i]->airplay_stream_category))) {
pthread_join(conns[i]->thread, NULL);
debug(1, "Connection %d: joined.", conns[i]->connection_number);
free(conns[i]);
conns[i] = NULL;
}
}
debug_mutex_unlock(&conns_lock, 3);
}
// The principal_conn variable points to the connection that
// controls the mDNS status and flags and that is potentially
// in control of the playing subsystem to output audio to a backend
// the principal_conn variable may be NULL
// the principal_conn is set by an ANNOUNCE message (Classic AirPlay) or
// by the initial SETUP (of a connection, not of a play session) message (AirPlay 2) and cleared
// when a session is terminated (AirPlay 2)
// In AirPlay 2, only one PTP connection can be live at any time, and it is the principal_conn.
// This is because, in AirPlay 2, the principal_conn connection
// also has control of the mDNS interface, and thus determines the state of the player as seen by
// other devices.
void release_play_lock(rtsp_conn_info *conn) {
// no need thread cancellation points in here
pthread_rwlock_wrlock(&principal_conn_lock);
if (principal_conn == conn) { // if we have the player
if (conn != NULL)
debug(2, "Connection %d: principal_conn released.", conn->connection_number);
principal_conn = NULL; // let it go
}
pthread_rwlock_unlock(&principal_conn_lock);
}
// stop the current principal_conn from playing if necessary and make conn the principal_conn.
int get_play_lock(rtsp_conn_info *conn, int allow_session_interruption) {
int response = 0;
pthread_rwlock_wrlock(&principal_conn_lock);
pthread_cleanup_push(rwlock_unlock, (void *)&principal_conn_lock);
if (principal_conn != NULL)
debug(2, "Connection %d: is requested to relinquish principal_conn.",
principal_conn->connection_number);
if (conn != NULL)
debug(2, "Connection %d: request to acquire principal_conn.", conn->connection_number);
// returns -1 if it failed, 0 if it succeeded and 1 if it succeeded but
// interrupted an existing session
if (principal_conn == NULL) {
principal_conn = conn;
} else if (principal_conn == conn) {
if (conn != NULL)
warn("Connection %d: request to re-acquire principal_conn!",
principal_conn->connection_number);
} else if (allow_session_interruption != 0) {
rtsp_conn_info *previous_principal_conn = principal_conn;
// important -- demote the principal conn before cancelling it
principal_conn = NULL;
pthread_cancel(previous_principal_conn->thread);
// the previous principal thread will block on the principal conn lock when exiting
// so it's important not to wait for it here, e.g. don't put in a pthread_join here.
// threads are garbage-collected later
usleep(1000000); // don't know why this delay is needed.
principal_conn = conn; // make the conn the new principal_conn
response = 1; // interrupted an existing session
} else {
response = -1; // can't get it...
}
if (principal_conn != NULL)
debug(3, "Connection %d has principal_conn.", principal_conn->connection_number);
pthread_cleanup_pop(1); // release the principal_conn lock
return response;
}
static void track_thread(rtsp_conn_info *conn) {
debug_mutex_lock(&conns_lock, 1000000, 3);
// look for an empty slot first
int i = 0;
int found = 0;
while ((i < nconns) && (found == 0)) {
if (conns[i] == NULL)
found = 1;
else
i++;
}
if (found != 0) {
conns[i] = conn;
} else {
// make space for a new element
conns = realloc(conns, sizeof(rtsp_conn_info *) * (nconns + 1));
if (conns) {
conns[nconns] = conn;
nconns++;
} else {
die("could not reallocate memory for conns");
}
}
debug_mutex_unlock(&conns_lock, 3);
}
int old_connection_count = -1;
void cleanup_threads(void) {
void *retval;
int i;
int connection_count = 0;
// debug(2, "culling threads.");
debug_mutex_lock(&conns_lock, 1000000, 3);
for (i = 0; i < nconns; i++) {
if ((conns[i] != NULL) && (conns[i]->running == 0)) {
debug(2, "Found RTSP connection thread %d in a non-running state.",
conns[i]->connection_number);
pthread_join(conns[i]->thread, &retval);
debug(2, "Connection %d: deleted.", conns[i]->connection_number);
free(conns[i]);
conns[i] = NULL;
}
if (conns[i] != NULL) {
debug(3, "Airplay Volume for connection %d is %.6f.", conns[i]->connection_number,
suggested_volume(conns[i]));
connection_count++;
}
}
debug_mutex_unlock(&conns_lock, 3);
if (old_connection_count != connection_count) {
if (connection_count == 0) {
debug(2, "No active connections.");
} else if (connection_count == 1)
debug(2, "One active connection.");
else
debug(2, "%d active connections.", connection_count);
old_connection_count = connection_count;
}
debug(3, "Airplay Volume for new connections is %.6f.", suggested_volume(NULL));
}
// park a null at the line ending, and return the next line pointer
// accept \r, \n, or \r\n
static char *nextline(char *in, int inbuf) {
char *out = NULL;
while (inbuf) {
if (*in == '\r') {
*in++ = 0;
out = in;
inbuf--;
}
if ((*in == '\n') && (inbuf)) {
*in++ = 0;
out = in;
}
if (out)
break;
in++;
inbuf--;
}
return out;
}
void msg_retain(rtsp_message *msg) {
int rc = pthread_mutex_lock(&reference_counter_lock);
if (rc)
debug(1, "Error %d locking reference counter lock");
if (msg > (rtsp_message *)0x00010000) {
msg->referenceCount++;
debug(3, "msg_free increment reference counter message %d to %d.", msg->index_number,
msg->referenceCount);
// debug(1,"msg_retain -- item %d reference count %d.", msg->index_number, msg->referenceCount);
rc = pthread_mutex_unlock(&reference_counter_lock);
if (rc)
debug(1, "Error %d unlocking reference counter lock");
} else {
debug(1, "invalid rtsp_message pointer 0x%x passed to retain", (uintptr_t)msg);
}
}
rtsp_message *msg_init(void) {
// no thread cancellation points here
int rc = pthread_mutex_lock(&reference_counter_lock);
if (rc)
debug(1, "Error %d locking reference counter lock", rc);
rtsp_message *msg = malloc(sizeof(rtsp_message));
if (msg) {
memset(msg, 0, sizeof(rtsp_message));
msg->referenceCount = 1; // from now on, any access to this must be protected with the lock
msg->index_number = msg_indexes++;
debug(3, "msg_init message %d", msg->index_number);
} else {
die("msg_init -- can not allocate memory for rtsp_message %d.", msg_indexes);
}
// debug(1,"msg_init -- create item %d.", msg->index_number);
rc = pthread_mutex_unlock(&reference_counter_lock);
if (rc)
debug(1, "Error %d unlocking reference counter lock", rc);
return msg;
}
int msg_add_header(rtsp_message *msg, char *name, char *value) {
if (msg->nheaders >= sizeof(msg->name) / sizeof(char *)) {
warn("too many headers?!");
return 1;
}
msg->name[msg->nheaders] = strdup(name);
msg->value[msg->nheaders] = strdup(value);
msg->nheaders++;
return 0;
}
char *msg_get_header(rtsp_message *msg, char *name) {
unsigned int i;
for (i = 0; i < msg->nheaders; i++)
if (!strcasecmp(msg->name[i], name))
return msg->value[i];
return NULL;
}
void _debug_print_msg_headers(const char *filename, const int linenumber, int level,
rtsp_message *msg) {
unsigned int i;
if (msg->respcode != 0)
_debug(filename, linenumber, level, " Response Code: %d.", msg->respcode);
for (i = 0; i < msg->nheaders; i++) {
_debug(filename, linenumber, level, " Type: \"%s\", content: \"%s\"", msg->name[i],
msg->value[i]);
}
}
/*
static void debug_print_msg_content(int level, rtsp_message *msg) {
if (msg->contentlength) {
char *obf = malloc(msg->contentlength * 2 + 1);
if (obf) {
char *obfp = obf;
int obfc;
for (obfc = 0; obfc < msg->contentlength; obfc++) {
snprintf(obfp, 3, "%02X", msg->content[obfc]);
obfp += 2;
};
*obfp = 0;
debug(level, "Content (hex): \"%s\"", obf);
free(obf);
} else {
debug(level, "Can't allocate space for debug buffer");
}
} else {
debug(level, "No content");
}
}
*/
void msg_free(rtsp_message **msgh) {
debug_mutex_lock(&reference_counter_lock, 1000, 0);
if (*msgh > (rtsp_message *)0x00010000) {
rtsp_message *msg = *msgh;
msg->referenceCount--;
if (msg->referenceCount)
debug(3, "msg_free decrement reference counter message %d to %d", msg->index_number,
msg->referenceCount);
if (msg->referenceCount == 0) {
unsigned int i;
for (i = 0; i < msg->nheaders; i++) {
free(msg->name[i]);
free(msg->value[i]);
}
if (msg->content)
free(msg->content);
// debug(1,"msg_free item %d -- free.",msg->index_number);
uintptr_t index = (msg->index_number) & 0xFFFF;
if (index == 0)
index = 0x10000; // ensure it doesn't fold to zero.
*msgh =
(rtsp_message *)(index); // put a version of the index number of the freed message in here
debug(3, "msg_free freed message %d", msg->index_number);
free(msg);
} else {
// debug(1,"msg_free item %d -- decrement reference to
// %d.",msg->index_number,msg->referenceCount);
}
} else if (*msgh != NULL) {
debug(1,
"msg_free: error attempting to free an allocated but already-freed rtsp_message, number "
"%d.",
(uintptr_t)*msgh);
}
debug_mutex_unlock(&reference_counter_lock, 0);
}
int msg_handle_line(rtsp_message **pmsg, char *line) {
rtsp_message *msg = *pmsg;
if (!msg) {
msg = msg_init();
*pmsg = msg;
char *sp, *p;
sp = NULL; // this is to quieten a compiler warning
debug(3, "RTSP Message Received: \"%s\".", line);
p = strtok_r(line, " ", &sp);
if (!p)
goto fail;
strncpy(msg->method, p, sizeof(msg->method) - 1);
p = strtok_r(NULL, " ", &sp);
if (!p)
goto fail;
strncpy(msg->path, p, sizeof(msg->path) - 1);
p = strtok_r(NULL, " ", &sp);
if (!p)
goto fail;
if (strcmp(p, "RTSP/1.0"))
goto fail;
return -1;
}
if (strlen(line)) {
char *p;
p = strstr(line, ": ");
if (!p) {
warn("bad header: >>%s<<", line);
goto fail;
}
*p = 0;
p += 2;
msg_add_header(msg, line, p);
debug(3, " %s: %s.", line, p);
return -1;
} else {
char *cl = msg_get_header(msg, "Content-Length");
if (cl)
return atoi(cl);
else
return 0;
}
fail:
debug(3, "msg_handle_line fail");
msg_free(pmsg);
*pmsg = NULL;
return 0;
}
#ifdef CONFIG_AIRPLAY_2
void add_flush_request(int flushNow, uint32_t flushFromSeq, uint32_t flushFromTS,
uint32_t flushUntilSeq, uint32_t flushUntilTS, rtsp_conn_info *conn) {
// immediate flush requests are added sequentially. Don't know how more than one could arise, TBH
flush_request_t **t = &conn->flush_requests;
int done = 0;
do {
flush_request_t *u = *t;
if ((u == NULL) || ((u->flushNow == 0) && (flushNow != 0)) ||
(flushFromSeq < u->flushFromSeq) ||
((flushFromSeq == u->flushFromSeq) && (flushFromTS < u->flushFromTS))) {
flush_request_t *n = (flush_request_t *)calloc(1, sizeof(flush_request_t));
n->flushNow = flushNow;
n->flushFromSeq = flushFromSeq;
n->flushFromTS = flushFromTS;
n->flushUntilSeq = flushUntilSeq;
n->flushUntilTS = flushUntilTS;
n->next = u;
*t = n;
done = 1;
} else {
t = &u->next;
}
} while (done == 0);
}
void display_all_flush_requests(rtsp_conn_info *conn) {
if (conn->flush_requests == NULL) {
debug(1, "No flush requests.");
} else {
flush_request_t *t = conn->flush_requests;
do {
if (t->flushNow) {
debug(1, "immediate flush to untilSeq: %u, untilTS: %u.", t->flushUntilSeq,
t->flushUntilTS);
} else {
debug(1, "fromSeq: %u, fromTS: %u, to untilSeq: %u, untilTS: %u.", t->flushFromSeq,
t->flushFromTS, t->flushUntilSeq, t->flushUntilTS);
}
t = t->next;
} while (t != NULL);
}
}
int rtsp_message_contains_plist(rtsp_message *message) {
int reply = 0; // assume there is no plist in the message
if ((message->contentlength >= strlen("bplist00")) &&
(strstr(message->content, "bplist00") == message->content))
reply = 1;
return reply;
}
plist_t plist_from_rtsp_content(rtsp_message *message) {
plist_t the_plist = NULL;
if (rtsp_message_contains_plist(message)) {
plist_from_memory(message->content, message->contentlength, &the_plist);
}
return the_plist;
}
char *plist_content(plist_t the_plist) {
// caller must free the returned character buffer
// convert it to xml format
uint32_t size;
char *plist_out = NULL;
plist_to_xml(the_plist, &plist_out, &size);
// put it into a NUL-terminated string
char *reply = malloc(size + 1);
if (reply) {
memcpy(reply, plist_out, size);
reply[size] = '\0';
}
if (the_plist)
plist_free(the_plist);
if (plist_out)
free(plist_out);
return reply;
}
// caller must free the returned character buffer
char *rtsp_plist_content(rtsp_message *message) {
char *reply = NULL;
// first, check if it has binary plist content
if (rtsp_message_contains_plist(message)) {
// get the plist from the content
plist_t the_plist = plist_from_rtsp_content(message);
// convert it to xml format
uint32_t size;
char *plist_out = NULL;
plist_to_xml(the_plist, &plist_out, &size);
// put it into a NUL-terminated string
reply = malloc(size + 1);
if (reply) {
memcpy(reply, plist_out, size);
reply[size] = '\0';
}
if (the_plist)
plist_free(the_plist);
if (plist_out)
free(plist_out);
}
return reply;
}