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b98e6a9ac0fa8f77d46a5cc656db388210f27659
shairport-sync/shairport.c
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Belbo b98e6a9ac0 Fixed race condition when stopping other threads with SIGUSR1 
Many threads have a main loop that checks some exit variable in the loop condition. To stop a thread, another thread sets that exit variable, sends a SIGUSR1 to that thread to get it out of blocking calls like read(), write() or select(), and finally joins it.

There was a race condition though: if the signal arrived after the loop condition was checked but before the blocking system function was entered, the target thread essentially ignored the signal, made the blocking call anyway, and could get stuck forever there.

The only way around this race condition is to block SIGUSR1 in the destination thread during the critical time interval. This requires that the blocking system call and the call to unblock SIGUSR1 be an atomic unit. There is only one system call that makes this possible: pselect(), which takes a signal mask to replace the current signal mask with, but only while pselect() runs. Other functions like read(), recv(), write() and sendto() may only be called if we can be sure that they don't block. For this purpose, the file descriptors must be set to non-blocking mode and we must prepend the call to them with a call to pselect() to block until the socket becomes readable/writable.
2017-11-01 20:46:05 +01:00

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/*
* Shairport, an Apple Airplay receiver
* Copyright (c) James Laird 2013
* All rights reserved.
* Modifications (c) Mike Brady 2014--2017
*
* 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 <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <libconfig.h>
#include <libgen.h>
#include <memory.h>
#include <net/if.h>
#include <popt.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "config.h"
#ifdef HAVE_LIBMBEDTLS
#include <mbedtls/md5.h>
#endif
#ifdef HAVE_LIBPOLARSSL
#include <polarssl/md5.h>
#endif
#ifdef HAVE_LIBSSL
#include <openssl/md5.h>
#endif
#if defined(HAVE_DBUS)
#include <glib.h>
#endif
#ifdef HAVE_DBUS
#include "dbus/src/dbus_service.h"
#endif
#include "common.h"
#include "mdns.h"
#include "rtp.h"
#include "rtsp.h"
#include <libdaemon/dexec.h>
#include <libdaemon/dfork.h>
#include <libdaemon/dlog.h>
#include <libdaemon/dpid.h>
#include <libdaemon/dsignal.h>
#ifdef CONFIG_CONVOLUTION
#include <FFTConvolver/convolver.h>
#endif
static int shutting_down = 0;
static char *appName = NULL;
char configuration_file_path[4096 + 1];
char actual_configuration_file_path[4096 + 1];
void shairport_shutdown() {
if (shutting_down)
return;
shutting_down = 1;
mdns_unregister();
rtsp_request_shutdown_stream();
if (config.output)
config.output->deinit();
}
static void sig_ignore(int foo, siginfo_t *bar, void *baz) {}
static void sig_shutdown(int foo, siginfo_t *bar, void *baz) {
debug(1, "shutdown requested...");
shairport_shutdown();
// daemon_log(LOG_NOTICE, "exit...");
daemon_retval_send(255);
daemon_pid_file_remove();
exit(0);
}
static void sig_child(int foo, siginfo_t *bar, void *baz) {
pid_t pid;
while ((pid = waitpid((pid_t)-1, 0, WNOHANG)) > 0) {
if (pid == mdns_pid && !shutting_down) {
die("MDNS child process died unexpectedly!");
}
}
}
static void sig_disconnect_audio_output(int foo, siginfo_t *bar, void *baz) {
debug(1, "disconnect audio output requested.");
set_requested_connection_state_to_output(0);
}
static void sig_connect_audio_output(int foo, siginfo_t *bar, void *baz) {
debug(1, "connect audio output requested.");
set_requested_connection_state_to_output(1);
}
// The following two functions are adapted slightly and with thanks from Jonathan Leffler's sample
// code at
// https://stackoverflow.com/questions/675039/how-can-i-create-directory-tree-in-c-linux
int do_mkdir(const char *path, mode_t mode) {
struct stat st;
int status = 0;
if (stat(path, &st) != 0) {
/* Directory does not exist. EEXIST for race condition */
if (mkdir(path, mode) != 0 && errno != EEXIST)
status = -1;
} else if (!S_ISDIR(st.st_mode)) {
errno = ENOTDIR;
status = -1;
}
return (status);
}
// mkpath - ensure all directories in path exist
// Algorithm takes the pessimistic view and works top-down to ensure
// each directory in path exists, rather than optimistically creating
// the last element and working backwards.
int mkpath(const char *path, mode_t mode) {
char *pp;
char *sp;
int status;
char *copypath = strdup(path);
status = 0;
pp = copypath;
while (status == 0 && (sp = strchr(pp, '/')) != 0) {
if (sp != pp) {
/* Neither root nor double slash in path */
*sp = '\0';
status = do_mkdir(copypath, mode);
*sp = '/';
}
pp = sp + 1;
}
if (status == 0)
status = do_mkdir(path, mode);
free(copypath);
return (status);
}
char *get_version_string() {
char *version_string = malloc(200);
if (version_string) {
strcpy(version_string, PACKAGE_VERSION);
#ifdef HAVE_LIBMBEDTLS
strcat(version_string, "-mbedTLS");
#endif
#ifdef HAVE_LIBPOLARSSL
strcat(version_string, "-PolarSSL");
#endif
#ifdef HAVE_LIBSSL
strcat(version_string, "-OpenSSL");
#endif
#ifdef CONFIG_TINYSVCMDNS
strcat(version_string, "-tinysvcmdns");
#endif
#ifdef CONFIG_AVAHI
strcat(version_string, "-Avahi");
#endif
#ifdef CONFIG_DNS_SD
strcat(version_string, "-dns_sd");
#endif
#ifdef CONFIG_ALSA
strcat(version_string, "-ALSA");
#endif
#ifdef CONFIG_SNDIO
strcat(version_string, "-sndio");
#endif
#ifdef CONFIG_AO
strcat(version_string, "-ao");
#endif
#ifdef CONFIG_PA
strcat(version_string, "-pa");
#endif
#ifdef CONFIG_SOUNDIO
strcat(version_string, "-soundio");
#endif
#ifdef CONFIG_DUMMY
strcat(version_string, "-dummy");
#endif
#ifdef CONFIG_STDOUT
strcat(version_string, "-stdout");
#endif
#ifdef CONFIG_PIPE
strcat(version_string, "-pipe");
#endif
#ifdef HAVE_LIBSOXR
strcat(version_string, "-soxr");
#endif
#ifdef CONFIG_CONVOLUTION
strcat(version_string, "-convolution");
#endif
#ifdef CONFIG_METADATA
strcat(version_string, "-metadata");
#endif
strcat(version_string, "-sysconfdir:");
strcat(version_string, SYSCONFDIR);
}
return version_string;
}
void print_version(void) {
char *version_string = get_version_string();
if (version_string) {
printf("%s\n", version_string);
free(version_string);
} else {
debug(1, "Can't print version string!");
}
}
void usage(char *progname) {
printf("Usage: %s [options...]\n", progname);
printf(" or: %s [options...] -- [audio output-specific options]\n", progname);
printf("\n");
printf("Options:\n");
printf(" -h, --help show this help.\n");
printf(" -d, --daemon daemonise.\n");
printf(" -j, --justDaemoniseNoPIDFile daemonise without a PID file.\n");
printf(" -V, --version show version information.\n");
printf(" -k, --kill kill the existing shairport daemon.\n");
printf(" -D, --disconnectFromOutput disconnect immediately from the output device.\n");
printf(" -R, --reconnectToOutput reconnect to the output device.\n");
printf(" -c, --configfile=FILE read configuration settings from FILE. Default is "
"/etc/shairport-sync.conf.\n");
printf("\n");
printf("The following general options are for backward compatibility. These and all new options "
"have settings in the configuration file, by default /etc/shairport-sync.conf:\n");
printf(" -v, --verbose -v print debug information; -vv more; -vvv lots.\n");
printf(" -p, --port=PORT set RTSP listening port.\n");
printf(" -a, --name=NAME set advertised name.\n");
// printf(" -A, --AirPlayLatency=FRAMES [Deprecated] Set the latency for audio sent from an "
// "AirPlay device.\n");
// printf(" The default is to set it automatically.\n");
// printf(" -i, --iTunesLatency=FRAMES [Deprecated] Set the latency for audio sent from iTunes
// "
// "10 or later.\n");
// printf(" The default is to set it automatically.\n");
printf(" -L, --latency=FRAMES [Deprecated] Set the latency for audio sent from an unknown "
"device.\n");
printf(" The default is to set it automatically.\n");
printf(" --forkedDaapdLatency=FRAMES [Deprecated] Set the latency for audio sent from "
"forked-daapd.\n");
printf(" The default is to set it automatically.\n");
printf(" -S, --stuffing=MODE set how to adjust current latency to match desired latency, "
"where \n");
printf(" \"basic\" (default) inserts or deletes audio frames from "
"packet frames with low processor overhead, and \n");
printf(" \"soxr\" uses libsoxr to minimally resample packet frames -- "
"moderate processor overhead.\n");
printf(
" \"soxr\" option only available if built with soxr support.\n");
printf(" -B, --on-start=PROGRAM run PROGRAM when playback is about to begin.\n");
printf(" -E, --on-stop=PROGRAM run PROGRAM when playback has ended.\n");
printf(" For -B and -E options, specify the full path to the program, "
"e.g. /usr/bin/logger.\n");
printf(" Executable scripts work, but must have #!/bin/sh (or "
"whatever) in the headline.\n");
printf(
" -w, --wait-cmd wait until the -B or -E programs finish before continuing.\n");
printf(" -o, --output=BACKEND select audio output method.\n");
printf(" -m, --mdns=BACKEND force the use of BACKEND to advertize the service.\n");
printf(" if no mdns provider is specified,\n");
printf(" shairport tries them all until one works.\n");
printf(" -r, --resync=THRESHOLD [Deprecated] resync if error exceeds this number of frames. "
"Set to 0 to "
"stop resyncing.\n");
printf(" -t, --timeout=SECONDS go back to idle mode from play mode after a break in "
"communications of this many seconds (default 120). Set to 0 never to exit play mode.\n");
printf(" --statistics print some interesting statistics -- output to the logfile "
"if running as a daemon.\n");
printf(" --tolerance=TOLERANCE [Deprecated] allow a synchronization error of TOLERANCE "
"frames (default "
"88) before trying to correct it.\n");
printf(" --password=PASSWORD require PASSWORD to connect. Default is not to require a "
"password.\n");
printf(" --logOutputLevel log the output level setting -- useful for setting maximum "
"volume.\n");
#ifdef CONFIG_METADATA
printf(" --metadata-pipename=PIPE send metadata to PIPE, e.g. "
"--metadata-pipename=/tmp/shairport-sync-metadata.\n");
printf(" The default is /tmp/shairport-sync-metadata.\n");
printf(" --get-coverart send cover art through the metadata pipe.\n");
#endif
printf("\n");
mdns_ls_backends();
printf("\n");
audio_ls_outputs();
}
int parse_options(int argc, char **argv) {
// there are potential memory leaks here -- it's called a second time, previously allocated
// strings will dangle.
char *raw_service_name = NULL; /* Used to pick up the service name before possibly expanding it */
char *stuffing = NULL; /* used for picking up the stuffing option */
signed char c; /* used for argument parsing */
int i = 0; /* used for tracking options */
int fResyncthreshold = (int)(config.resyncthreshold * 44100);
int fTolerance = (int)(config.tolerance * 44100);
poptContext optCon; /* context for parsing command-line options */
int daemonisewith = 0;
int daemonisewithout = 0;
struct poptOption optionsTable[] = {
{"verbose", 'v', POPT_ARG_NONE, NULL, 'v', NULL},
{"disconnectFromOutput", 'D', POPT_ARG_NONE, NULL, 0, NULL},
{"reconnectToOutput", 'R', POPT_ARG_NONE, NULL, 0, NULL},
{"kill", 'k', POPT_ARG_NONE, NULL, 0, NULL},
{"daemon", 'd', POPT_ARG_NONE, &daemonisewith, 0, NULL},
{"justDaemoniseNoPIDFile", 'j', POPT_ARG_NONE, &daemonisewithout, 0, NULL},
{"configfile", 'c', POPT_ARG_STRING, &config.configfile, 0, NULL},
{"statistics", 0, POPT_ARG_NONE, &config.statistics_requested, 0, NULL},
{"logOutputLevel", 0, POPT_ARG_NONE, &config.logOutputLevel, 0, NULL},
{"version", 'V', POPT_ARG_NONE, NULL, 0, NULL},
{"port", 'p', POPT_ARG_INT, &config.port, 0, NULL},
{"name", 'a', POPT_ARG_STRING, &raw_service_name, 0, NULL},
{"output", 'o', POPT_ARG_STRING, &config.output_name, 0, NULL},
{"on-start", 'B', POPT_ARG_STRING, &config.cmd_start, 0, NULL},
{"on-stop", 'E', POPT_ARG_STRING, &config.cmd_stop, 0, NULL},
{"wait-cmd", 'w', POPT_ARG_NONE, &config.cmd_blocking, 0, NULL},
{"mdns", 'm', POPT_ARG_STRING, &config.mdns_name, 0, NULL},
{"latency", 'L', POPT_ARG_INT, &config.userSuppliedLatency, 0, NULL},
{"AirPlayLatency", 'A', POPT_ARG_INT, &config.AirPlayLatency, 0, NULL},
{"iTunesLatency", 'i', POPT_ARG_INT, &config.iTunesLatency, 0, NULL},
{"forkedDaapdLatency", 'f', POPT_ARG_INT, &config.ForkedDaapdLatency, 0, NULL},
{"stuffing", 'S', POPT_ARG_STRING, &stuffing, 'S', NULL},
{"resync", 'r', POPT_ARG_INT, &fResyncthreshold, 0, NULL},
{"timeout", 't', POPT_ARG_INT, &config.timeout, 't', NULL},
{"password", 0, POPT_ARG_STRING, &config.password, 0, NULL},
{"tolerance", 'z', POPT_ARG_INT, &fTolerance, 0, NULL},
#ifdef CONFIG_METADATA
{"metadata-pipename", 'M', POPT_ARG_STRING, &config.metadata_pipename, 'M', NULL},
{"get-coverart", 'g', POPT_ARG_NONE, &config.get_coverart, 'g', NULL},
#endif
POPT_AUTOHELP{NULL, 0, 0, NULL, 0}};
// we have to parse the command line arguments to look for a config file
int optind;
optind = argc;
int j;
for (j = 0; j < argc; j++)
if (strcmp(argv[j], "--") == 0)
optind = j;
optCon = poptGetContext(NULL, optind, (const char **)argv, optionsTable, 0);
poptSetOtherOptionHelp(optCon, "[OPTIONS]* ");
/* Now do options processing just to get a debug level */
debuglev = 0;
while ((c = poptGetNextOpt(optCon)) >= 0) {
switch (c) {
case 'v':
debuglev++;
break;
case 'D':
inform("Warning: the option -D or --disconnectFromOutput is deprecated.");
break;
case 'R':
inform("Warning: the option -R or --reconnectToOutput is deprecated.");
break;
case 'A':
inform("Warning: the option -A or --AirPlayLatency is deprecated. This setting is now "
"automatically received from the AirPlay device.");
break;
case 'i':
inform("Warning: the option -i or --iTunesLatency is deprecated. This setting is now "
"automatically received from iTunes");
break;
case 'f':
inform("Warning: the option --forkedDaapdLatency is deprecated. This setting is now "
"automatically received from forkedDaapd");
break;
case 'r':
inform("Warning: the option -r or --resync is deprecated. Please use the "
"\"resync_threshold_in_seconds\" setting in the config file instead.");
break;
case 'z':
inform("Warning: the option --tolerance is deprecated. Please use the "
"\"drift_tolerance_in_seconds\" setting in the config file instead.");
break;
}
}
if (c < -1) {
die("%s: %s", poptBadOption(optCon, POPT_BADOPTION_NOALIAS), poptStrerror(c));
}
if ((daemonisewith) && (daemonisewithout))
die("Select either daemonize_with_pid_file or daemonize_without_pid_file -- you have selected "
"both!");
if ((daemonisewith) || (daemonisewithout)) {
config.daemonise = 1;
if (daemonisewith)
config.daemonise_store_pid = 1;
};
config.resyncthreshold = 1.0 * fResyncthreshold / 44100;
config.tolerance = 1.0 * fTolerance / 44100;
config.audio_backend_silent_lead_in_time = -1.0; // flag to indicate it has not been set
config_setting_t *setting;
const char *str = 0;
int value = 0;
double dvalue = 0.0;
// debug(1, "Looking for the configuration file \"%s\".", config.configfile);
config_init(&config_file_stuff);
char *config_file_real_path = realpath(config.configfile, NULL);
if (config_file_real_path == NULL) {
debug(2, "Can't resolve the configuration file \"%s\".", config.configfile);
} else {
debug(2, "Looking for configuration file at full path \"%s\"", config_file_real_path);
/* Read the file. If there is an error, report it and exit. */
if (config_read_file(&config_file_stuff, config_file_real_path)) {
// make config.cfg point to it
config.cfg = &config_file_stuff;
/* Get the Service Name. */
if (config_lookup_string(config.cfg, "general.name", &str)) {
raw_service_name = (char *)str;
}
int daemonisewithout = 0;
int daemonisewith = 0;
/* Get the Daemonize setting. */
if (config_lookup_string(config.cfg, "sessioncontrol.daemonize_with_pid_file", &str)) {
if (strcasecmp(str, "no") == 0)
daemonisewith = 0;
else if (strcasecmp(str, "yes") == 0)
daemonisewith = 1;
else
die("Invalid daemonize_with_pid_file option choice \"%s\". It should be \"yes\" or "
"\"no\"");
}
/* Get the Just_Daemonize setting. */
if (config_lookup_string(config.cfg, "sessioncontrol.daemonize_without_pid_file", &str)) {
if (strcasecmp(str, "no") == 0)
daemonisewithout = 0;
else if (strcasecmp(str, "yes") == 0)
daemonisewithout = 1;
else
die("Invalid daemonize_without_pid_file option choice \"%s\". It should be \"yes\" or "
"\"no\"");
}
if ((daemonisewith) && (daemonisewithout))
die("Select either daemonize_with_pid_file or daemonize_without_pid_file -- you have "
"selected both!");
if ((daemonisewith) || (daemonisewithout)) {
config.daemonise = 1;
if (daemonisewith)
config.daemonise_store_pid = 1;
}
/* Get the directory path for the pid file created when the program is daemonised. */
if (config_lookup_string(config.cfg, "sessioncontrol.daemon_pid_dir", &str))
config.piddir = (char *)str;
/* Get the mdns_backend setting. */
if (config_lookup_string(config.cfg, "general.mdns_backend", &str))
config.mdns_name = (char *)str;
/* Get the output_backend setting. */
if (config_lookup_string(config.cfg, "general.output_backend", &str))
config.output_name = (char *)str;
/* Get the port setting. */
if (config_lookup_int(config.cfg, "general.port", &value)) {
if ((value < 0) || (value > 65535))
die("Invalid port number \"%sd\". It should be between 0 and 65535, default is 5000",
value);
else
config.port = value;
}
/* Get the udp port base setting. */
if (config_lookup_int(config.cfg, "general.udp_port_base", &value)) {
if ((value < 0) || (value > 65535))
die("Invalid port number \"%sd\". It should be between 0 and 65535, default is 6001",
value);
else
config.udp_port_base = value;
}
/* Get the udp port range setting. This is number of ports that will be tried for free ports ,
* starting at the port base. Only three ports are needed. */
if (config_lookup_int(config.cfg, "general.udp_port_range", &value)) {
if ((value < 0) || (value > 65535))
die("Invalid port range \"%sd\". It should be between 0 and 65535, default is 100",
value);
else
config.udp_port_range = value;
}
/* Get the password setting. */
if (config_lookup_string(config.cfg, "general.password", &str))
config.password = (char *)str;
if (config_lookup_string(config.cfg, "general.interpolation", &str)) {
if (strcasecmp(str, "basic") == 0)
config.packet_stuffing = ST_basic;
else if (strcasecmp(str, "soxr") == 0)
#ifdef HAVE_LIBSOXR
config.packet_stuffing = ST_soxr;
#else
die("The soxr option not available because this version of shairport-sync was built "
"without libsoxr "
"support. Change the \"general/interpolation\" setting in the configuration file.");
#endif
else
die("Invalid interpolation option choice. It should be \"basic\" or \"soxr\"");
}
/* Get the statistics setting. */
if (config_lookup_string(config.cfg, "general.statistics", &str)) {
if (strcasecmp(str, "no") == 0)
config.statistics_requested = 0;
else if (strcasecmp(str, "yes") == 0)
config.statistics_requested = 1;
else
die("Invalid statistics option choice \"%s\". It should be \"yes\" or \"no\"");
}
/* The old drift tolerance setting. */
if (config_lookup_int(config.cfg, "general.drift", &value)) {
inform("The drift setting is deprecated. Use "
"drift_tolerance_in_seconds instead");
config.tolerance = 1.0 * value / 44100;
}
/* The old resync setting. */
if (config_lookup_int(config.cfg, "general.resync_threshold", &value)) {
inform("The resync_threshold setting is deprecated. Use "
"resync_threshold_in_seconds instead");
config.resyncthreshold = 1.0 * value / 44100;
}
/* Get the drift tolerance setting. */
if (config_lookup_float(config.cfg, "general.drift_tolerance_in_seconds", &dvalue))
config.tolerance = dvalue;
/* Get the resync setting. */
if (config_lookup_float(config.cfg, "general.resync_threshold_in_seconds", &dvalue))
config.resyncthreshold = dvalue;
/* Get the verbosity setting. */
if (config_lookup_int(config.cfg, "general.log_verbosity", &value)) {
if ((value >= 0) && (value <= 3))
debuglev = value;
else
die("Invalid log verbosity setting option choice \"%d\". It should be between 0 and 3, "
"inclusive.",
value);
}
/* Get the ignore_volume_control setting. */
if (config_lookup_string(config.cfg, "general.ignore_volume_control", &str)) {
if (strcasecmp(str, "no") == 0)
config.ignore_volume_control = 0;
else if (strcasecmp(str, "yes") == 0)
config.ignore_volume_control = 1;
else
die("Invalid ignore_volume_control option choice \"%s\". It should be \"yes\" or \"no\"");
}
/* Get the optional volume_max_db setting. */
if (config_lookup_float(config.cfg, "general.volume_max_db", &dvalue)) {
// debug(1, "Max volume setting of %f dB", dvalue);
config.volume_max_db = dvalue;
config.volume_max_db_set = 1;
}
if (config_lookup_string(config.cfg, "general.run_this_when_volume_is_set", &str)) {
config.cmd_set_volume = (char *)str;
}
/* Get the playback_mode setting */
if (config_lookup_string(config.cfg, "general.playback_mode", &str)) {
if (strcasecmp(str, "stereo") == 0)
config.playback_mode = ST_stereo;
else if (strcasecmp(str, "mono") == 0)
config.playback_mode = ST_mono;
else if (strcasecmp(str, "reverse stereo") == 0)
config.playback_mode = ST_reverse_stereo;
else if (strcasecmp(str, "both left") == 0)
config.playback_mode = ST_left_only;
else if (strcasecmp(str, "both right") == 0)
config.playback_mode = ST_right_only;
else
die("Invalid playback_mode choice \"%s\". It should be \"stereo\" (default), \"mono\", "
"\"reverse stereo\", \"both left\", \"both right\"");
}
/* Get the interface to listen on, if specified Default is all interfaces */
/* we keep the interface name and the index */
if (config_lookup_string(config.cfg, "general.interface", &str))
config.interface = strdup(str);
if (config_lookup_string(config.cfg, "general.interface", &str)) {
int specified_interface_found = 0;
struct if_nameindex *if_ni, *i;
if_ni = if_nameindex();
if (if_ni == NULL) {
debug(1, "Can't get a list of interface names.");
} else {
for (i = if_ni; !(i->if_index == 0 && i->if_name == NULL); i++) {
// printf("%u: %s\n", i->if_index, i->if_name);
if (strcmp(i->if_name, str) == 0) {
config.interface_index = i->if_index;
specified_interface_found = 1;
}
}
}
if_freenameindex(if_ni);
if (specified_interface_found == 0) {
inform(
"The mdns service interface \"%s\" was not found, so the setting has been ignored.",
config.interface);
free(config.interface);
config.interface = NULL;
config.interface_index = 0;
}
}
/* Get the regtype -- the service type and protocol, separated by a dot. Default is
* "_raop._tcp" */
if (config_lookup_string(config.cfg, "general.regtype", &str))
config.regtype = strdup(str);
/* Get the volume range, in dB, that should be used If not set, it means you just use the
* range set by the mixer. */
if (config_lookup_int(config.cfg, "general.volume_range_db", &value)) {
if ((value < 30) || (value > 150))
die("Invalid volume range \"%sd\". It should be between 30 and 150 dB. Zero means use "
"the mixer's native range",
value);
else
config.volume_range_db = value;
}
/* Get the alac_decoder setting. */
if (config_lookup_string(config.cfg, "general.alac_decoder", &str)) {
if (strcasecmp(str, "hammerton") == 0)
config.use_apple_decoder = 0;
else if (strcasecmp(str, "apple") == 0) {
if ((config.decoders_supported & 1 << decoder_apple_alac) != 0)
config.use_apple_decoder = 1;
else
inform("Support for the Apple ALAC decoder has not been compiled into this version of "
"Shairport Sync. The default decoder will be used.");
} else
die("Invalid alac_decoder option choice \"%s\". It should be \"hammerton\" or \"apple\"");
}
/* Get the default latency. Deprecated! */
if (config_lookup_int(config.cfg, "latencies.default", &value))
config.userSuppliedLatency = value;
/* Get the itunes latency. Deprecated! */
if (config_lookup_int(config.cfg, "latencies.itunes", &value))
config.iTunesLatency = value;
/* Get the AirPlay latency. Deprecated! */
if (config_lookup_int(config.cfg, "latencies.airplay", &value))
config.AirPlayLatency = value;
/* Get the forkedDaapd latency. Deprecated! */
if (config_lookup_int(config.cfg, "latencies.forkedDaapd", &value))
config.ForkedDaapdLatency = value;
#ifdef CONFIG_METADATA
/* Get the metadata setting. */
if (config_lookup_string(config.cfg, "metadata.enabled", &str)) {
if (strcasecmp(str, "no") == 0)
config.metadata_enabled = 0;
else if (strcasecmp(str, "yes") == 0)
config.metadata_enabled = 1;
else
die("Invalid metadata enabled option choice \"%s\". It should be \"yes\" or \"no\"");
}
if (config_lookup_string(config.cfg, "metadata.include_cover_art", &str)) {
if (strcasecmp(str, "no") == 0)
config.get_coverart = 0;
else if (strcasecmp(str, "yes") == 0)
config.get_coverart = 1;
else
die("Invalid metadata include_cover_art option choice \"%s\". It should be \"yes\" or "
"\"no\"");
}
if (config_lookup_string(config.cfg, "metadata.pipe_name", &str)) {
config.metadata_pipename = (char *)str;
}
if (config_lookup_string(config.cfg, "metadata.socket_address", &str)) {
config.metadata_sockaddr = (char *)str;
}
if (config_lookup_int(config.cfg, "metadata.socket_port", &value)) {
config.metadata_sockport = value;
}
config.metadata_sockmsglength = 500;
if (config_lookup_int(config.cfg, "metadata.socket_msglength", &value)) {
config.metadata_sockmsglength = value < 500 ? 500 : value > 65000 ? 65000 : value;
}
#endif
if (config_lookup_string(config.cfg, "sessioncontrol.run_this_before_play_begins", &str)) {
config.cmd_start = (char *)str;
}
if (config_lookup_string(config.cfg, "sessioncontrol.run_this_after_play_ends", &str)) {
config.cmd_stop = (char *)str;
}
if (config_lookup_string(config.cfg, "sessioncontrol.wait_for_completion", &str)) {
if (strcasecmp(str, "no") == 0)
config.cmd_blocking = 0;
else if (strcasecmp(str, "yes") == 0)
config.cmd_blocking = 1;
else
die("Invalid session control wait_for_completion option choice \"%s\". It should be "
"\"yes\" or \"no\"");
}
if (config_lookup_string(config.cfg, "sessioncontrol.before_play_begins_returns_output",
&str)) {
if (strcasecmp(str, "no") == 0)
config.cmd_start_returns_output = 0;
else if (strcasecmp(str, "yes") == 0)
config.cmd_start_returns_output = 1;
else
die("Invalid session control before_play_begins_returns_output option choice \"%s\". It "
"should be "
"\"yes\" or \"no\"");
}
if (config_lookup_string(config.cfg, "sessioncontrol.allow_session_interruption", &str)) {
config.dont_check_timeout = 0; // this is for legacy -- only set by -t 0
if (strcasecmp(str, "no") == 0)
config.allow_session_interruption = 0;
else if (strcasecmp(str, "yes") == 0)
config.allow_session_interruption = 1;
else
die("Invalid session control allow_interruption option choice \"%s\". It should be "
"\"yes\" "
"or \"no\"");
}
if (config_lookup_int(config.cfg, "sessioncontrol.session_timeout", &value)) {
config.timeout = value;
config.dont_check_timeout = 0; // this is for legacy -- only set by -t 0
}
#ifdef CONFIG_CONVOLUTION
if (config_lookup_string(config.cfg, "dsp.convolution", &str)) {
if (strcasecmp(str, "no") == 0)
config.convolution = 0;
else if (strcasecmp(str, "yes") == 0)
config.convolution = 1;
else
die("Invalid dsp.convolution. It should be \"yes\" or \"no\"");
}
if (config_lookup_float(config.cfg, "dsp.convolution_gain", &dvalue)) {
config.convolution_gain = dvalue;
if (dvalue > 10 || dvalue < -50)
die("Invalid value \"%f\" for dsp.convolution_gain. It should be between -50 and +10 dB",
dvalue);
}
config.convolution_max_length = 8192;
if (config_lookup_int(config.cfg, "dsp.convolution_max_length", &value)) {
config.convolution_max_length = value;
if (value < 1 || value > 200000)
die("dsp.convolution_max_length must be within 1 and 200000");
}
if (config_lookup_string(config.cfg, "dsp.convolution_ir_file", &str)) {
config.convolution_ir_file = str;
convolver_init(config.convolution_ir_file, config.convolution_max_length);
}
if (config.convolution && config.convolution_ir_file == NULL) {
die("Convolution enabled but no convolution_ir_file provided");
}
#endif
if (config_lookup_string(config.cfg, "dsp.loudness", &str)) {
if (strcasecmp(str, "no") == 0)
config.loudness = 0;
else if (strcasecmp(str, "yes") == 0)
config.loudness = 1;
else
die("Invalid dsp.convolution. It should be \"yes\" or \"no\"");
}
config.loudness_reference_volume_db = -20;
if (config_lookup_float(config.cfg, "dsp.loudness_reference_volume_db", &dvalue)) {
config.loudness_reference_volume_db = dvalue;
if (dvalue > 0 || dvalue < -100)
die("Invalid value \"%f\" for dsp.loudness_reference_volume_db. It should be between "
"-100 and 0",
dvalue);
}
if (config.loudness == 1 && config_lookup_string(config.cfg, "alsa.mixer_control_name", &str))
die("Loudness activated but hardware volume is active. You must remove "
"\"alsa.mixer_control_name\" to use the loudness filter.");
} else {
if (config_error_type(&config_file_stuff) == CONFIG_ERR_FILE_IO)
debug(1, "Error reading configuration file \"%s\": \"%s\".",
config_error_file(&config_file_stuff), config_error_text(&config_file_stuff));
else {
die("Line %d of the configuration file \"%s\":\n%s", config_error_line(&config_file_stuff),
config_error_file(&config_file_stuff), config_error_text(&config_file_stuff));
}
}
free(config_file_real_path);
}
// now, do the command line options again, but this time do them fully -- it's a unix convention
// that command line
// arguments have precedence over configuration file settings.
optind = argc;
for (j = 0; j < argc; j++)
if (strcmp(argv[j], "--") == 0)
optind = j;
optCon = poptGetContext(NULL, optind, (const char **)argv, optionsTable, 0);
poptSetOtherOptionHelp(optCon, "[OPTIONS]* ");
/* Now do options processing, get portname */
int tdebuglev = 0;
while ((c = poptGetNextOpt(optCon)) >= 0) {
switch (c) {
case 'v':
tdebuglev++;
break;
case 't':
if (config.timeout == 0) {
config.dont_check_timeout = 1;
config.allow_session_interruption = 1;
} else {
config.dont_check_timeout = 0;
config.allow_session_interruption = 0;
}
break;
#ifdef CONFIG_METADATA
case 'M':
config.metadata_enabled = 1;
break;
case 'g':
if (config.metadata_enabled == 0)
die("If you want to get cover art, you must also select the --metadata-pipename option.");
break;
#endif
case 'S':
if (strcmp(stuffing, "basic") == 0)
config.packet_stuffing = ST_basic;
else if (strcmp(stuffing, "soxr") == 0)
#ifdef HAVE_LIBSOXR
config.packet_stuffing = ST_soxr;
#else
die("The soxr option not available because this version of shairport-sync was built "
"without libsoxr "
"support. Change the -S option setting.");
#endif
else
die("Illegal stuffing option \"%s\" -- must be \"basic\" or \"soxr\"", stuffing);
break;
}
}
if (c < -1) {
die("%s: %s", poptBadOption(optCon, POPT_BADOPTION_NOALIAS), poptStrerror(c));
}
#ifdef CONFIG_METADATA
if ((config.metadata_enabled == 1) && (config.metadata_pipename == NULL))
config.metadata_pipename = strdup("/tmp/shairport-sync-metadata");
#endif
/* if the regtype hasn't been set, do it now */
if (config.regtype == NULL)
config.regtype = strdup("_raop._tcp");
if (tdebuglev != 0)
debuglev = tdebuglev;
/* if the Service Name wasn't specified, do it now */
if (raw_service_name == NULL)
raw_service_name = strdup("%H");
// now, do the substitutions in the service name
char hostname[100];
gethostname(hostname, 100);
char *i1 = str_replace(raw_service_name, "%h", hostname);
if ((hostname[0] >= 'a') && (hostname[0] <= 'z'))
hostname[0] = hostname[0] - 0x20; // convert a lowercase first letter into a capital letter
char *i2 = str_replace(i1, "%H", hostname);
char *i3 = str_replace(i2, "%v", PACKAGE_VERSION);
char *vs = get_version_string();
config.service_name = str_replace(i3, "%V", vs);
free(i1);
free(i2);
free(i3);
free(vs);
// now, check and calculate the pid directory
#ifdef USE_CUSTOM_PID_DIR
char *use_this_pid_dir = PIDDIR;
#else
char *use_this_pid_dir = "/var/run/shairport-sync";
#endif
// debug(1,"config.piddir \"%s\".",config.piddir);
if (config.piddir)
use_this_pid_dir = config.piddir;
if (use_this_pid_dir)
config.computed_piddir = strdup(use_this_pid_dir);
return optind + 1;
}
#if defined(HAVE_DBUS) || defined(HAVE_MPRIS)
GMainLoop *loop;
pthread_t dbus_thread;
void *dbus_thread_func(void *arg) {
loop = g_main_loop_new(NULL, FALSE);
g_main_loop_run(loop);
return NULL;
}
#endif
void signal_setup(void) {
// mask off all signals before creating threads.
// this way we control which thread gets which signals.
// for now, we don't care which thread gets the following.
sigset_t set;
sigfillset(&set);
sigdelset(&set, SIGINT);
sigdelset(&set, SIGTERM);
sigdelset(&set, SIGHUP);
sigdelset(&set, SIGSTOP);
sigdelset(&set, SIGCHLD);
sigdelset(&set, SIGUSR2);
pthread_sigmask(SIG_BLOCK, &set, NULL);
// SIGUSR1 is used to interrupt a thread if blocked in pselect
pthread_sigmask(SIG_SETMASK, NULL, &pselect_sigset);
sigdelset(&pselect_sigset, SIGUSR1);
// setting this to SIG_IGN would prevent signalling any threads.
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_flags = SA_SIGINFO;
sa.sa_sigaction = &sig_ignore;
sigaction(SIGUSR1, &sa, NULL);
sa.sa_flags = SA_SIGINFO | SA_RESTART;
sa.sa_sigaction = &sig_shutdown;
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
sa.sa_sigaction = &sig_disconnect_audio_output;
sigaction(SIGUSR2, &sa, NULL);
sa.sa_sigaction = &sig_connect_audio_output;
sigaction(SIGHUP, &sa, NULL);
sa.sa_sigaction = &sig_child;
sigaction(SIGCHLD, &sa, NULL);
}
// forked daemon lets the spawner know it's up and running OK
// should be called only once!
void shairport_startup_complete(void) {
if (config.daemonise) {
// daemon_ready();
}
}
const char *pid_file_proc(void) {
char fn[8192];
snprintf(fn, sizeof(fn), "%s/%s.pid", config.computed_piddir,
daemon_pid_file_ident ? daemon_pid_file_ident : "unknown");
// debug(1,"fn \"%s\".",fn);
return strdup(fn);
}
void exit_function() {
if (config.cfg)
config_destroy(config.cfg);
// probably should be freeing malloc'ed memory here, including strdup-created strings...
}
int main(int argc, char **argv) {
daemon_set_verbosity(LOG_DEBUG);
memset(&config, 0, sizeof(config)); // also clears all strings, BTW
atexit(exit_function);
// this is a bit weird, but apparently necessary
char *basec = strdup(argv[0]);
char *bname = basename(basec);
appName = strdup(bname);
if (appName == NULL)
die("can not allocate memory for the app name!");
free(basec);
// set defaults
// get thje endianness
union {
uint32_t u32;
uint8_t arr[4];
} xn;
xn.arr[0] = 0x44; /* Lowest-address byte */
xn.arr[1] = 0x33;
xn.arr[2] = 0x22;
xn.arr[3] = 0x11; /* Highest-address byte */
if (xn.u32 == 0x11223344)
endianness = SS_LITTLE_ENDIAN;
else if (xn.u32 == 0x33441122)
endianness = SS_PDP_ENDIAN;
else if (xn.u32 == 0x44332211)
endianness = SS_BIG_ENDIAN;
else
die("Can not recognise the endianness of the processor.");
// set non-zero / non-NULL default values here
// but note that audio back ends also have a chance to set defaults
strcpy(configuration_file_path, SYSCONFDIR);
// strcat(configuration_file_path, "/shairport-sync"); // thinking about adding a special
// shairport-sync directory
strcat(configuration_file_path, "/");
strcat(configuration_file_path, appName);
strcat(configuration_file_path, ".conf");
config.configfile = configuration_file_path;
config.statistics_requested = 0; // don't print stats in the log
config.latency = -1; // -1 means not set. 88200 works well. This is also reset in rtsp.c when play
// is about to start
config.userSuppliedLatency = 0; // zero means none supplied
config.iTunesLatency =
-1; // -1 means not supplied. 99400 seems to work pretty well for iTunes from Version 10 (?)
// upwards-- two left-ear headphones, one from the iMac jack, one
// from an NSLU2 running a cheap "3D Sound" USB Soundcard
config.AirPlayLatency =
-1; // -1 means not set. 88200 seems to work well for AirPlay -- Syncs sound and
// vision on AppleTV, but also used for iPhone/iPod/iPad sources
config.ForkedDaapdLatency = -1; // -1 means not set. 99400 seems to be right
config.resyncthreshold = 0.05; // 50 ms
config.timeout = 120; // this number of seconds to wait for [more] audio before switching to idle.
config.tolerance =
0.002; // this number of seconds of timing error before attempting to correct it.
config.buffer_start_fill = 220;
config.port = 5000;
config.packet_stuffing = ST_basic; // simple interpolation or deletion
// char hostname[100];
// gethostname(hostname, 100);
// config.service_name = malloc(20 + 100);
// snprintf(config.service_name, 20 + 100, "Shairport Sync on %s", hostname);
set_requested_connection_state_to_output(
1); // we expect to be able to connect to the output device
config.audio_backend_buffer_desired_length = 6615; // 0.15 seconds.
config.udp_port_base = 6001;
config.udp_port_range = 100;
config.output_format = SPS_FORMAT_S16; // default
config.output_rate = 44100; // default
config.decoders_supported =
1 << decoder_hammerton; // David Hammerton's decoder supported by default
#ifdef HAVE_APPLE_ALAC
config.decoders_supported += 1 << decoder_apple_alac;
#endif
// initialise random number generator
r64init(0);
// initialise the randomw number array
r64arrayinit();
/* Check if we are called with -V or --version parameter */
if (argc >= 2 && ((strcmp(argv[1], "-V") == 0) || (strcmp(argv[1], "--version") == 0))) {
print_version();
exit(1);
}
/* Check if we are called with -h or --help parameter */
if (argc >= 2 && ((strcmp(argv[1], "-h") == 0) || (strcmp(argv[1], "--help") == 0))) {
usage(argv[0]);
exit(1);
}
pid_t pid;
/* Reset signal handlers */
if (daemon_reset_sigs(-1) < 0) {
daemon_log(LOG_ERR, "Failed to reset all signal handlers: %s", strerror(errno));
return 1;
}
/* Unblock signals */
if (daemon_unblock_sigs(-1) < 0) {
daemon_log(LOG_ERR, "Failed to unblock all signals: %s", strerror(errno));
return 1;
}
// Point to a function to help locate where the PID file will go
// We always use this function because the default location
// is unsatisfactory. By default we want to use /var/run/shairport-sync/.
daemon_pid_file_proc = pid_file_proc;
/* Set indentification string for the daemon for both syslog and PID file */
daemon_pid_file_ident = daemon_log_ident = daemon_ident_from_argv0(argv[0]);
/* Check if we are called with -D or --disconnectFromOutput parameter */
if (argc >= 2 &&
((strcmp(argv[1], "-D") == 0) || (strcmp(argv[1], "--disconnectFromOutput") == 0))) {
if ((pid = daemon_pid_file_is_running()) >= 0) {
if (kill(pid, SIGUSR2) != 0) { // try to send the signal
daemon_log(LOG_WARNING,
"Failed trying to send disconnectFromOutput command to daemon pid: %d: %s", pid,
strerror(errno));
}
} else {
daemon_log(LOG_WARNING,
"Can't send a disconnectFromOutput request -- Failed to find daemon: %s",
strerror(errno));
}
exit(1);
}
/* Check if we are called with -R or --reconnectToOutput parameter */
if (argc >= 2 &&
((strcmp(argv[1], "-R") == 0) || (strcmp(argv[1], "--reconnectToOutput") == 0))) {
if ((pid = daemon_pid_file_is_running()) >= 0) {
if (kill(pid, SIGHUP) != 0) { // try to send the signal
daemon_log(LOG_WARNING,
"Failed trying to send reconnectToOutput command to daemon pid: %d: %s", pid,
strerror(errno));
}
} else {
daemon_log(LOG_WARNING, "Can't send a reconnectToOutput request -- Failed to find daemon: %s",
strerror(errno));
}
exit(1);
}
// parse arguments into config -- needed to locate pid_dir
int audio_arg = parse_options(argc, argv);
/* Check if we are called with -k or --kill parameter */
if (argc >= 2 && ((strcmp(argv[1], "-k") == 0) || (strcmp(argv[1], "--kill") == 0))) {
int ret;
/* Kill daemon with SIGTERM */
/* Check if the new function daemon_pid_file_kill_wait() is available, if it is, use it. */
if ((ret = daemon_pid_file_kill_wait(SIGTERM, 5)) < 0)
daemon_log(LOG_WARNING, "Failed to kill daemon: %s", strerror(errno));
else
daemon_pid_file_remove();
return ret < 0 ? 1 : 0;
}
/* If we are going to daemonise, check that the daemon is not running already.*/
if ((config.daemonise) && ((pid = daemon_pid_file_is_running()) >= 0)) {
daemon_log(LOG_ERR, "Daemon already running on PID file %u", pid);
return 1;
}
// mDNS supports maximum of 63-character names (we append 13).
if (strlen(config.service_name) > 50) {
warn("Supplied name too long (max 50 characters)");
config.service_name[50] = '\0'; // truncate it and carry on...
}
/* here, daemonise with libdaemon */
if (config.daemonise) {
/* Prepare for return value passing from the initialization procedure of the daemon process */
if (daemon_retval_init() < 0) {
daemon_log(LOG_ERR, "Failed to create pipe.");
return 1;
}
/* Do the fork */
if ((pid = daemon_fork()) < 0) {
/* Exit on error */
daemon_retval_done();
return 1;
} else if (pid) { /* The parent */
int ret;
/* Wait for 20 seconds for the return value passed from the daemon process */
if ((ret = daemon_retval_wait(20)) < 0) {
daemon_log(LOG_ERR, "Could not receive return value from daemon process: %s",
strerror(errno));
return 255;
}
switch (ret) {
case 0:
break;
case 1:
daemon_log(LOG_ERR,
"daemon failed to launch: could not close open file descriptors after forking.");
break;
case 2:
daemon_log(LOG_ERR, "daemon failed to launch: could not create PID file.");
break;
case 3:
daemon_log(LOG_ERR, "daemon failed to launch: could not create or access PID directory.");
break;
default:
daemon_log(LOG_ERR, "daemon failed to launch, error %i.", ret);
}
return ret;
} else { /* The daemon */
/* Close FDs */
if (daemon_close_all(-1) < 0) {
daemon_log(LOG_ERR, "Failed to close all file descriptors: %s", strerror(errno));
/* Send the error condition to the parent process */
daemon_retval_send(1);
goto finish;
}
/* Create the PID file if required */
if (config.daemonise_store_pid) {
/* Create the PID directory if required -- we don't really care about the result */
printf("PID directory is \"%s\".", config.computed_piddir);
int result = mkpath(config.computed_piddir, 0700);
if ((result != 0) && (result != -EEXIST)) {
// error creating or accessing the PID file directory
daemon_retval_send(3);
goto finish;
}
if (daemon_pid_file_create() < 0) {
daemon_log(LOG_ERR, "Could not create PID file (%s).", strerror(errno));
daemon_retval_send(2);
goto finish;
}
}
/* Send OK to parent process */
daemon_retval_send(0);
}
/* end libdaemon stuff */
}
signal_setup();
// make sure the program can create files that group and world can read
umask(S_IWGRP | S_IWOTH);
config.output = audio_get_output(config.output_name);
if (!config.output) {
audio_ls_outputs();
die("Invalid audio output specified!");
}
config.output->init(argc - audio_arg, argv + audio_arg);
// daemon_log(LOG_NOTICE, "startup");
switch (endianness) {
case SS_LITTLE_ENDIAN:
debug(2, "The processor is running little-endian.");
break;
case SS_BIG_ENDIAN:
debug(2, "The processor is running big-endian.");
break;
case SS_PDP_ENDIAN:
debug(2, "The processor is running pdp-endian.");
break;
}
/* Mess around with the latency options */
// Basically, we used to rely on static latencies -- 99400 for iTunes 10 or later and forkedDaapd,
// 88200 for everything else
// Nowadays we allow the source to set the latency, which works out at 99651 for iTunes 10 and
// forkedDaapd and 88220 for everything else
// What we want to do here is allow the source to set the latency unless the user has specified an
// non-standard latency.
// If the user has specified a standard latency, we suggest to them to stop doing it.
// If they specify a non-standard latency, we suggest the user to use the
// audio_backend_latency_offset instead.
if (config.AirPlayLatency != -1) {
if (config.AirPlayLatency == 88200) {
inform("It is not necessary to set the AirPlay latency to 88200 -- you should remove this "
"setting or configuration option, as it is deprecated.");
config.AirPlayLatency = -1;
} else {
inform("The AirPlay latency setting is deprecated, as Shairport Sync can now get the correct "
"latency from the source.");
inform("Please remove this setting and use the relevant audio_backend_latency_offset "
"setting, if necessary, to compensate for delays elsewhere.");
}
}
if (config.iTunesLatency != -1) {
if (config.iTunesLatency == 99400) {
inform("It is not necessary to set the iTunes latency to 99400 -- you should remove this "
"setting or configuration option, as it is deprecated and ignored.");
config.iTunesLatency = -1;
} else {
inform("The iTunes latency setting is deprecated, as Shairport Sync can now get the correct "
"latency from the source.");
inform("Please remove this setting and use the relevant audio_backend_latency_offset "
"setting, if necessary, to compensate for delays elsewhere.");
}
}
if (config.ForkedDaapdLatency != -1) {
if (config.ForkedDaapdLatency == 99400) {
inform("It is not necessary to set the forkedDaapd latency to 99400 -- you should remove "
"this setting or configuration option, as it is deprecated and ignored.");
config.ForkedDaapdLatency = -1;
} else {
inform("The forkedDaapd latency setting is deprecated, as Shairport Sync can now get the "
"correct latency from the source.");
inform("Please remove this setting and use the relevant audio_backend_latency_offset "
"setting, if necessary, to compensate for delays elsewhere.");
}
}
if (config.userSuppliedLatency) {
inform("The default latency setting is deprecated, as Shairport Sync can now get the correct "
"latency from the source.");
inform("Please remove this setting and use the relevant audio_backend_latency_offset setting, "
"if necessary, to compensate for delays elsewhere.");
}
/* print out version */
char *version_dbs = get_version_string();
if (version_dbs) {
debug(1, "Version: \"%s\"", version_dbs);
free(version_dbs);
} else {
debug(1, "Can't print the version information!");
}
/* Print out options */
debug(1, "statistics_requester status is %d.", config.statistics_requested);
debug(1, "daemon status is %d.", config.daemonise);
debug(1, "deamon pid file is \"%s\".", pid_file_proc());
debug(1, "rtsp listening port is %d.", config.port);
debug(1, "udp base port is %d.", config.udp_port_base);
debug(1, "udp port range is %d.", config.udp_port_range);
debug(1, "player name is \"%s\".", config.service_name);
debug(1, "backend is \"%s\".", config.output_name);
debug(1, "on-start action is \"%s\".", config.cmd_start);
debug(1, "on-stop action is \"%s\".", config.cmd_stop);
debug(1, "wait-cmd status is %d.", config.cmd_blocking);
debug(1, "on-start returns output is %d.", config.cmd_start_returns_output);
debug(1, "mdns backend \"%s\".", config.mdns_name);
debug(2, "userSuppliedLatency is %d.", config.userSuppliedLatency);
debug(2, "AirPlayLatency is %d.", config.AirPlayLatency);
debug(2, "iTunesLatency is %d.", config.iTunesLatency);
debug(2, "forkedDaapdLatency is %d.", config.ForkedDaapdLatency);
debug(1, "stuffing option is \"%d\" (0-basic, 1-soxr).", config.packet_stuffing);
debug(1, "resync time is %f seconds.", config.resyncthreshold);
debug(1, "allow a session to be interrupted: %d.", config.allow_session_interruption);
debug(1, "busy timeout time is %d.", config.timeout);
debug(1, "drift tolerance is %f seconds.", config.tolerance);
debug(1, "password is \"%s\".", config.password);
debug(1, "ignore_volume_control is %d.", config.ignore_volume_control);
if (config.volume_max_db_set)
debug(1, "volume_max_db is %d.", config.volume_max_db);
else
debug(1, "volume_max_db is not set");
debug(1, "playback_mode is %d (0-stereo, 1-mono, 1-reverse_stereo, 2-both_left, 3-both_right).",
config.playback_mode);
debug(1, "disable_synchronization is %d.", config.no_sync);
debug(1, "use_mmap_if_available is %d.", config.no_mmap ? 0 : 1);
debug(1, "output_rate is %d.", config.output_rate);
debug(1,
"output_format is %d (0-unknown, 1-S8, 2-U8, 3-S16, 4-S24, 5-S24_3LE, 6-S24_3BE, 7-S32).",
config.output_format);
debug(1, "audio backend desired buffer length is %f seconds.",
config.audio_backend_buffer_desired_length);
debug(1, "audio backend latency offset is %f seconds.", config.audio_backend_latency_offset);
debug(1, "audio backend silence lead-in time is %f seconds. A value -1.0 means use the default.",
config.audio_backend_silent_lead_in_time);
debug(1, "volume range in dB (zero means use the range specified by the mixer): %u.",
config.volume_range_db);
debug(1, "zeroconf regtype is \"%s\".", config.regtype);
debug(1, "decoders_supported field is %d.", config.decoders_supported);
debug(1, "use_apple_decoder is %d.", config.use_apple_decoder);
debug(1, "alsa_use_playback_switch_for_mute is %d.", config.alsa_use_playback_switch_for_mute);
if (config.interface)
debug(1, "mdns service interface \"%s\" requested.", config.interface);
else
debug(1, "no special mdns service interface was requested.");
char *realConfigPath = realpath(config.configfile, NULL);
if (realConfigPath) {
debug(1, "configuration file name \"%s\" resolves to \"%s\".", config.configfile,
realConfigPath);
free(realConfigPath);
} else {
debug(1, "configuration file name \"%s\" can not be resolved.", config.configfile);
}
#ifdef CONFIG_METADATA
debug(1, "metadata enabled is %d.", config.metadata_enabled);
debug(1, "metadata pipename is \"%s\".", config.metadata_pipename);
debug(1, "metadata socket address is \"%s\" port %d.", config.metadata_sockaddr,
config.metadata_sockport);
debug(1, "metadata socket packet size is \"%d\".", config.metadata_sockmsglength);
debug(1, "get-coverart is %d.", config.get_coverart);
#endif
#ifdef CONFIG_CONVOLUTION
debug(1, "convolution is %d.", config.convolution);
debug(1, "convolution IR file is \"%s\"", config.convolution_ir_file);
debug(1, "convolution max length %d", config.convolution_max_length);
debug(1, "convolution gain is %f", config.convolution_gain);
#endif
debug(1, "loudness is %d.", config.loudness);
debug(1, "loudness reference level is %f", config.loudness_reference_volume_db);
uint8_t ap_md5[16];
#ifdef HAVE_LIBSSL
MD5_CTX ctx;
MD5_Init(&ctx);
MD5_Update(&ctx, config.service_name, strlen(config.service_name));
MD5_Final(ap_md5, &ctx);
#endif
#ifdef HAVE_LIBMBEDTLS
mbedtls_md5_context tctx;
mbedtls_md5_starts(&tctx);
mbedtls_md5_update(&tctx, (unsigned char *)config.service_name, strlen(config.service_name));
mbedtls_md5_finish(&tctx, ap_md5);
#endif
#ifdef HAVE_LIBPOLARSSL
md5_context tctx;
md5_starts(&tctx);
md5_update(&tctx, (unsigned char *)config.service_name, strlen(config.service_name));
md5_finish(&tctx, ap_md5);
#endif
memcpy(config.hw_addr, ap_md5, sizeof(config.hw_addr));
#ifdef CONFIG_METADATA
metadata_init(); // create the metadata pipe if necessary
#endif
#ifdef HAVE_DBUS
// Start up DBUS services after initial settings are all made
debug(1, "Starting up D-Bus services");
pthread_create(&dbus_thread, NULL, &dbus_thread_func, NULL);
start_dbus_service();
#endif
daemon_log(LOG_INFO, "Successful Startup");
rtsp_listen_loop();
// should not reach this...
shairport_shutdown();
finish:
daemon_log(LOG_NOTICE, "Unexpected exit...");
daemon_retval_send(255);
daemon_pid_file_remove();
return 1;
}
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