370 lines
12 KiB
C
370 lines
12 KiB
C
/*
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* Shairport, an Apple Airplay receiver
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* Copyright (c) James Laird 2013
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <signal.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <memory.h>
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#include <openssl/md5.h>
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#include <sys/wait.h>
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#include <getopt.h>
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#include "common.h"
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#include "rtsp.h"
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#include "mdns.h"
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#include <libdaemon/dfork.h>
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#include <libdaemon/dsignal.h>
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#include <libdaemon/dlog.h>
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#include <libdaemon/dpid.h>
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#include <libdaemon/dexec.h>
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static int shutting_down = 0;
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void shairport_shutdown() {
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if (shutting_down)
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return;
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shutting_down = 1;
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mdns_unregister();
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rtsp_shutdown_stream();
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if (config.output)
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config.output->deinit();
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}
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static void sig_ignore(int foo, siginfo_t *bar, void *baz) {
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}
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static void sig_shutdown(int foo, siginfo_t *bar, void *baz) {
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shairport_shutdown();
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daemon_log(LOG_NOTICE, "Exit...");
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daemon_retval_send(255);
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daemon_pid_file_remove();
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exit(0);
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}
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static void sig_child(int foo, siginfo_t *bar, void *baz) {
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pid_t pid;
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while ((pid = waitpid((pid_t)-1, 0, WNOHANG)) > 0) {
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if (pid == mdns_pid && !shutting_down) {
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die("MDNS child process died unexpectedly!");
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}
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}
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}
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static void sig_logrotate(int foo, siginfo_t *bar, void *baz) {
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// log_setup();
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}
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void usage(char *progname) {
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printf("Usage: %s [options...]\n", progname);
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printf(" or: %s [options...] -- [audio output-specific options]\n", progname);
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printf("\n");
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printf("Mandatory arguments to long options are mandatory for short options too.\n");
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printf("\n");
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printf("Options:\n");
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printf(" -h, --help show this help\n");
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printf(" -p, --port=PORT set RTSP listening port\n");
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printf(" -a, --name=NAME set advertised name\n");
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printf(" -A --AirPlayLatency=FRAMES set how many frames between a just-received frame and audio output\n");
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printf(" if the source's User Agent is \"AirPlay\". The default value is %u frames.\n", config.AirPlayLatency);
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printf(" -i --iTunesLatency=FRAMES set how many frames between a just-received frame and audio output\n");
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printf(" if the source's User Agent is \"iTunes\". The default value is %u frames.\n", config.iTunesLatency);
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printf(" -L --latency=FRAMES set how many frames between a just-received frame and audio output\n");
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printf(" starts. This value is in frames; if non-zero overrides all other latencies.\n");
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printf(" Default latency without \"AirPlay\" or \"iTunes\" User Agent is %u frames.\n", config.AirPlayLatency);
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printf(" -d, --daemon daemonise.\n");
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printf(" -k, --kill kill the existing shairport daemon.\n");
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printf(" -B, --on-start=COMMAND run a shell command when playback begins\n");
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printf(" -E, --on-stop=COMMAND run a shell command when playback ends\n");
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printf(" -o, --output=BACKEND select audio output method\n");
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printf(" -m, --mdns=BACKEND force the use of BACKEND to advertize the service\n");
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printf(" if no mdns provider is specified,\n");
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printf(" shairport tries them all until one works.\n");
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printf("\n");
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mdns_ls_backends();
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printf("\n");
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audio_ls_outputs();
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}
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int parse_options(int argc, char **argv) {
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// prevent unrecognised arguments from being shunted to the audio driver
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setenv("POSIXLY_CORRECT", "", 1);
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static struct option long_options[] = {
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{"help", no_argument, NULL, 'h'},
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{"daemon", no_argument, NULL, 'd'},
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{"kill", no_argument, NULL, 'k'},
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{"port", required_argument, NULL, 'p'},
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{"name", required_argument, NULL, 'a'},
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{"output", required_argument, NULL, 'o'},
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{"on-start",required_argument, NULL, 'B'},
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{"on-stop", required_argument, NULL, 'E'},
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{"mdns", required_argument, NULL, 'm'},
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{"latency", required_argument, NULL, 'L'},
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{"AirPlayLatency", required_argument, NULL, 'A'},
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{"iTunesLatency", required_argument, NULL, 'i'},
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{NULL, 0, NULL, 0}
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};
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int opt;
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while ((opt = getopt_long(argc, argv,
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"+hdvkp:a:o:b:B:E:m:L:A:i:",
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long_options, NULL)) > 0) {
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switch (opt) {
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default:
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case 'h':
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usage(argv[0]);
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exit(1);
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case 'd':
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config.daemonise = 1;
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break;
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case 'v':
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debuglev++;
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break;
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case 'p':
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config.port = atoi(optarg);
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break;
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case 'a':
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config.apname = optarg;
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break;
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case 'o':
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config.output_name = optarg;
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break;
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case 'L':
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config.userSuppliedLatency = atoi(optarg);
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break;
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case 'A':
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config.AirPlayLatency = atoi(optarg);
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break;
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case 'i':
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config.iTunesLatency = atoi(optarg);
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break;
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case 'B':
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config.cmd_start = optarg;
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break;
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case 'E':
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config.cmd_stop = optarg;
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break;
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case 'm':
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config.mdns_name = optarg;
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break;
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}
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}
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return optind;
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}
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void signal_setup(void) {
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// mask off all signals before creating threads.
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// this way we control which thread gets which signals.
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// for now, we don't care which thread gets the following.
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sigset_t set;
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sigfillset(&set);
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sigdelset(&set, SIGINT);
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sigdelset(&set, SIGTERM);
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sigdelset(&set, SIGHUP);
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sigdelset(&set, SIGSTOP);
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sigdelset(&set, SIGCHLD);
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pthread_sigmask(SIG_BLOCK, &set, NULL);
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// setting this to SIG_IGN would prevent signalling any threads.
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sa.sa_flags = SA_SIGINFO;
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sa.sa_sigaction = &sig_ignore;
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sigaction(SIGUSR1, &sa, NULL);
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sa.sa_flags = SA_SIGINFO | SA_RESTART;
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sa.sa_sigaction = &sig_shutdown;
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sigaction(SIGINT, &sa, NULL);
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sigaction(SIGTERM, &sa, NULL);
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sa.sa_sigaction = &sig_logrotate;
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sigaction(SIGHUP, &sa, NULL);
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sa.sa_sigaction = &sig_child;
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sigaction(SIGCHLD, &sa, NULL);
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}
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// forked daemon lets the spawner know it's up and running OK
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// should be called only once!
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void shairport_startup_complete(void) {
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if (config.daemonise) {
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// daemon_ready();
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}
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}
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int main(int argc, char **argv) {
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pid_t pid;
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daemon_set_verbosity(LOG_DEBUG);
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/* Reset signal handlers */
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if (daemon_reset_sigs(-1) < 0) {
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daemon_log(LOG_ERR, "Failed to reset all signal handlers: %s", strerror(errno));
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return 1;
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}
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/* Unblock signals */
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if (daemon_unblock_sigs(-1) < 0) {
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daemon_log(LOG_ERR, "Failed to unblock all signals: %s", strerror(errno));
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return 1;
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}
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/* Set indentification string for the daemon for both syslog and PID file */
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daemon_pid_file_ident = daemon_log_ident = daemon_ident_from_argv0(argv[0]);
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/* Check if we are called with -k parameter */
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if (argc >= 2 && !strcmp(argv[1], "-k")) {
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int ret;
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/* Kill daemon with SIGTERM */
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/* Check if the new function daemon_pid_file_kill_wait() is available, if it is, use it. */
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if ((ret = daemon_pid_file_kill_wait(SIGTERM, 5)) < 0)
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daemon_log(LOG_WARNING, "Failed to kill daemon: %s", strerror(errno));
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else
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daemon_pid_file_remove(); //
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return ret < 0 ? 1 : 0;
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}
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/* Check that the daemon is not running twice at the same time */
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if ((pid = daemon_pid_file_is_running()) >= 0) {
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daemon_log(LOG_ERR, "Daemon already running on PID file %u", pid);
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return 1;
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}
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memset(&config, 0, sizeof(config));
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// set defaults
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config.latency = 99400; // iTunes
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config.userSuppliedLatency = 0; // zero means none supplied
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config.iTunesLatency = 99400; // this seems to work pretty well for iTunes -- two left-ear headphones, one from the iMac jack, one from an NSLU2 running a cheap "3D Sound" USB Soundcard
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config.AirPlayLatency = 88200; // this seems to work pretty well for AirPlay -- Syncs sound and vision on AppleTV, but also used for iPhone/iPod/iPad sources
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config.buffer_start_fill = 220;
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config.port = 5000;
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char hostname[100];
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gethostname(hostname, 100);
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config.apname = malloc(20 + 100);
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snprintf(config.apname, 20 + 100, "%s Shairport Sync", hostname);
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// parse arguments into config
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int audio_arg = parse_options(argc, argv);
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// mDNS supports maximum of 63-character names (we append 13).
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if (strlen(config.apname) > 50)
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die("Supplied name too long (max 50 characters)");
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/* here, daemonise with libdaemon */
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if (config.daemonise) {
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/* Prepare for return value passing from the initialization procedure of the daemon process */
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if (daemon_retval_init() < 0) {
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daemon_log(LOG_ERR, "Failed to create pipe.");
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return 1;
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}
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/* Do the fork */
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if ((pid = daemon_fork()) < 0) {
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/* Exit on error */
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daemon_retval_done();
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return 1;
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} else if (pid) { /* The parent */
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int ret;
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/* Wait for 20 seconds for the return value passed from the daemon process */
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if ((ret = daemon_retval_wait(20)) < 0) {
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daemon_log(LOG_ERR, "Could not recieve return value from daemon process: %s", strerror(errno));
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return 255;
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}
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if (ret != 0)
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daemon_log(ret != 0 ? LOG_ERR : LOG_INFO, "Daemon returned %i as return value.", ret);
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return ret;
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} else { /* The daemon */
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/* Close FDs */
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if (daemon_close_all(-1) < 0) {
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daemon_log(LOG_ERR, "Failed to close all file descriptors: %s", strerror(errno));
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/* Send the error condition to the parent process */
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daemon_retval_send(1);
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goto finish;
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}
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/* Create the PID file */
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if (daemon_pid_file_create() < 0) {
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daemon_log(LOG_ERR, "Could not create PID file (%s).", strerror(errno));
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daemon_retval_send(2);
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goto finish;
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}
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/* Send OK to parent process */
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daemon_retval_send(0);
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}
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/* end libdaemon stuff */
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}
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signal_setup();
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config.output = audio_get_output(config.output_name);
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if (!config.output) {
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audio_ls_outputs();
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die("Invalid audio output specified!");
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}
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config.output->init(argc-audio_arg, argv+audio_arg);
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daemon_log(LOG_NOTICE, "Successful startup.");
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uint8_t ap_md5[16];
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MD5_CTX ctx;
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MD5_Init(&ctx);
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MD5_Update(&ctx, config.apname, strlen(config.apname));
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MD5_Final(ap_md5, &ctx);
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memcpy(config.hw_addr, ap_md5, sizeof(config.hw_addr));
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rtsp_listen_loop();
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// should not rerach this...
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shairport_shutdown();
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finish:
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daemon_log(LOG_NOTICE, "Unexpected exit...");
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daemon_retval_send(255);
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daemon_pid_file_remove();
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return 1;
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}
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