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server.c
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server.c
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/*
* MOC - music on console
* Copyright (C) 2003 - 2005 Damian Pietras <daper@daper.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/select.h>
#ifdef HAVE_GETRLIMIT
# include <sys/resource.h>
#endif
#include <sys/un.h>
#include <time.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <strings.h>
#include <signal.h>
#include <errno.h>
#include <stdarg.h>
#include <pthread.h>
#include <assert.h>
#define DEBUG
#include "common.h"
#include "log.h"
#include "protocol.h"
#include "audio.h"
#include "oss.h"
#include "options.h"
#include "server.h"
#include "playlist.h"
#include "tags_cache.h"
#include "files.h"
#include "softmixer.h"
#include "equalizer.h"
#define SERVER_LOG "mocp_server_log"
#define PID_FILE "pid"
struct client
{
int socket; /* -1 if inactive */
int wants_plist_events; /* requested playlist events? */
struct event_queue events;
pthread_mutex_t events_mtx;
int requests_plist; /* is the client waiting for the playlist? */
int can_send_plist; /* can this client send a playlist? */
int lock; /* is this client locking us? */
int serial; /* used for generating unique serial numbers */
};
static struct client clients[CLIENTS_MAX];
/* Thread ID of the server thread. */
static pthread_t server_tid;
/* Pipe used to wake up the server from select() from another thread. */
static int wake_up_pipe[2];
/* Socket used to accept incoming client connections. */
static int server_sock = -1;
/* Set to 1 when a signal arrived causing the program to exit. */
static volatile int server_quit = 0;
/* Information about currently played file */
static struct {
int avg_bitrate;
int bitrate;
int rate;
int channels;
} sound_info = {
-1,
-1,
-1,
-1
};
static struct tags_cache *tags_cache;
extern char **environ;
static void write_pid_file ()
{
char *fname = create_file_name (PID_FILE);
FILE *file;
if ((file = fopen(fname, "w")) == NULL)
fatal ("Can't open pid file for writing: %s", xstrerror (errno));
fprintf (file, "%d\n", getpid());
fclose (file);
}
/* Check if there is a pid file and if it is valid, return the pid, else 0 */
static pid_t check_pid_file ()
{
FILE *file;
pid_t pid;
char *fname = create_file_name (PID_FILE);
/* Read the pid file */
if ((file = fopen(fname, "r")) == NULL)
return 0;
if (fscanf(file, "%d", &pid) != 1) {
fclose (file);
return 0;
}
fclose (file);
return pid;
}
static void sig_chld (int sig LOGIT_ONLY)
{
int saved_errno;
pid_t rc;
log_signal (sig);
saved_errno = errno;
do {
rc = waitpid (-1, NULL, WNOHANG);
} while (rc > 0);
errno = saved_errno;
}
static void sig_exit (int sig)
{
log_signal (sig);
server_quit = 1;
// FIXME (JCF): pthread_*() are not async-signal-safe and
// should not be used within signal handlers.
if (!pthread_equal (server_tid, pthread_self()))
pthread_kill (server_tid, sig);
}
static void clients_init ()
{
int i;
for (i = 0; i < CLIENTS_MAX; i++) {
clients[i].socket = -1;
pthread_mutex_init (&clients[i].events_mtx, NULL);
}
}
static void clients_cleanup ()
{
int i, rc;
for (i = 0; i < CLIENTS_MAX; i++) {
clients[i].socket = -1;
rc = pthread_mutex_destroy (&clients[i].events_mtx);
if (rc != 0)
log_errno ("Can't destroy events mutex", rc);
}
}
/* Add a client to the list, return 1 if ok, 0 on error (max clients exceeded) */
static int add_client (int sock)
{
int i;
for (i = 0; i < CLIENTS_MAX; i++)
if (clients[i].socket == -1) {
clients[i].wants_plist_events = 0;
LOCK (clients[i].events_mtx);
event_queue_free (&clients[i].events);
event_queue_init (&clients[i].events);
UNLOCK (clients[i].events_mtx);
clients[i].socket = sock;
clients[i].requests_plist = 0;
clients[i].can_send_plist = 0;
clients[i].lock = 0;
tags_cache_clear_queue (tags_cache, i);
return 1;
}
return 0;
}
/* Return index of a client that has a lock acquired. Return -1 if there is no
* lock. */
static int locking_client ()
{
int i;
for (i = 0; i < CLIENTS_MAX; i++)
if (clients[i].socket != -1 && clients[i].lock)
return i;
return -1;
}
/* Acquire a lock for this client. Return 0 on error. */
static int client_lock (struct client *cli)
{
if (cli->lock) {
logit ("Client wants deadlock");
return 0;
}
assert (locking_client() == -1);
cli->lock = 1;
logit ("Lock acquired for client with fd %d", cli->socket);
return 1;
}
/* Return != 0 if this client holds a lock. */
static int is_locking (const struct client *cli)
{
return cli->lock;
}
/* Release the lock hold by the client. Return 0 on error. */
static int client_unlock (struct client *cli)
{
if (!cli->lock) {
logit ("Client wants to unlock when there is no lock");
return 0;
}
cli->lock = 0;
logit ("Lock released by client with fd %d", cli->socket);
return 1;
}
/* Return the client index from the clients table. */
static int client_index (const struct client *cli)
{
int i;
for (i = 0; i < CLIENTS_MAX; i++)
if (clients[i].socket == cli->socket)
return i;
return -1;
}
static void del_client (struct client *cli)
{
cli->socket = -1;
LOCK (cli->events_mtx);
event_queue_free (&cli->events);
tags_cache_clear_queue (tags_cache, client_index(cli));
UNLOCK (cli->events_mtx);
}
/* Check if the process with given PID exists. Return != 0 if so. */
static int valid_pid (const pid_t pid)
{
return kill(pid, 0) == 0 ? 1 : 0;
}
static void wake_up_server ()
{
int w = 1;
debug ("Waking up the server");
if (write(wake_up_pipe[1], &w, sizeof(w)) < 0)
log_errno ("Can't wake up the server: (write() failed)", errno);
}
static void redirect_output (FILE *stream)
{
FILE *rc;
if (stream == stdin)
rc = freopen ("/dev/null", "r", stream);
else
rc = freopen ("/dev/null", "w", stream);
if (!rc)
fatal ("Can't open /dev/null: %s", xstrerror (errno));
}
static void log_process_stack_size ()
{
#if !defined(NDEBUG) && defined(HAVE_GETRLIMIT)
int rc;
struct rlimit limits;
rc = getrlimit (RLIMIT_STACK, &limits);
if (rc == 0)
logit ("Process's stack size: %u", (unsigned int)limits.rlim_cur);
#endif
}
static void log_pthread_stack_size ()
{
#if !defined(NDEBUG) && defined(HAVE_PTHREAD_ATTR_GETSTACKSIZE)
int rc;
size_t stack_size;
pthread_attr_t attr;
rc = pthread_attr_init (&attr);
if (rc)
return;
rc = pthread_attr_getstacksize (&attr, &stack_size);
if (rc == 0)
logit ("PThread's stack size: %u", (unsigned int)stack_size);
pthread_attr_destroy (&attr);
#endif
}
/* Handle running external command on requested event. */
static void run_extern_cmd (const char *event)
{
char *command;
command = xstrdup (options_get_str (event));
if (command) {
char *args[2], *err;
args[0] = xstrdup (command);
args[1] = NULL;
switch (fork ()) {
case 0:
execve (command, args, environ);
fatal ("Error when running %s command '%s': %s",
event, command, xstrerror (errno));
case -1:
err = xstrerror (errno);
logit ("Error when running %s command '%s': %s",
event, command, err);
free (err);
break;
}
free (command);
free (args[0]);
}
}
/* Initialize the server - return fd of the listening socket or -1 on error */
void server_init (int debugging, int foreground)
{
struct sockaddr_un sock_name;
pid_t pid;
logit ("Starting MOC Server");
assert (server_sock == -1);
pid = check_pid_file ();
if (pid && valid_pid(pid)) {
fprintf (stderr, "\nIt seems that the server is already running"
" with pid %d.\n", pid);
fprintf (stderr, "If it is not true, remove the pid file (%s)"
" and try again.\n",
create_file_name(PID_FILE));
fatal ("Exiting!");
}
if (foreground)
log_init_stream (stdout, "stdout");
else {
FILE *logfp;
logfp = NULL;
if (debugging) {
logfp = fopen (SERVER_LOG, "a");
if (!logfp)
fatal ("Can't open server log file: %s", xstrerror (errno));
}
log_init_stream (logfp, SERVER_LOG);
}
if (pipe(wake_up_pipe) < 0)
fatal ("pipe() failed: %s", xstrerror (errno));
unlink (socket_name());
/* Create a socket.
* For reasons why AF_UNIX is the correct constant to use in both
* cases, see the commentary the SVN log for commit r9999. */
server_sock = socket (AF_UNIX, SOCK_STREAM, 0);
if (server_sock == -1)
fatal ("Can't create socket: %s", xstrerror (errno));
sock_name.sun_family = AF_UNIX;
strcpy (sock_name.sun_path, socket_name());
/* Bind to socket */
if (bind(server_sock, (struct sockaddr *)&sock_name, SUN_LEN(&sock_name)) == -1)
fatal ("Can't bind() to the socket: %s", xstrerror (errno));
if (listen(server_sock, 1) == -1)
fatal ("listen() failed: %s", xstrerror (errno));
/* Log stack sizes so stack overflows can be debugged. */
log_process_stack_size ();
log_pthread_stack_size ();
clients_init ();
audio_initialize ();
tags_cache = tags_cache_new (options_get_int("TagsCacheSize"));
tags_cache_load (tags_cache, create_file_name("cache"));
server_tid = pthread_self ();
xsignal (SIGTERM, sig_exit);
xsignal (SIGINT, foreground ? sig_exit : SIG_IGN);
xsignal (SIGHUP, SIG_IGN);
xsignal (SIGQUIT, sig_exit);
xsignal (SIGPIPE, SIG_IGN);
xsignal (SIGCHLD, sig_chld);
write_pid_file ();
if (!foreground) {
setsid ();
redirect_output (stdin);
redirect_output (stdout);
redirect_output (stderr);
}
logit ("Running OnServerStart");
run_extern_cmd ("OnServerStart");
return;
}
/* Send EV_DATA and the integer value. Return 0 on error. */
static int send_data_int (const struct client *cli, const int data)
{
assert (cli->socket != -1);
if (!send_int(cli->socket, EV_DATA) || !send_int(cli->socket, data))
return 0;
return 1;
}
/* Send EV_DATA and the boolean value. Return 0 on error. */
static int send_data_bool (const struct client *cli, const bool data)
{
assert (cli->socket != -1);
if (!send_int(cli->socket, EV_DATA) ||
!send_int(cli->socket, data ? 1 : 0))
return 0;
return 1;
}
/* Send EV_DATA and the string value. Return 0 on error. */
static int send_data_str (const struct client *cli, const char *str) {
if (!send_int(cli->socket, EV_DATA) || !send_str(cli->socket, str))
return 0;
return 1;
}
/* Add event to the client's queue */
static void add_event (struct client *cli, const int event, void *data)
{
LOCK (cli->events_mtx);
event_push (&cli->events, event, data);
UNLOCK (cli->events_mtx);
}
static void on_song_change ()
{
static char *last_file = NULL;
static lists_t_strs *on_song_change = NULL;
int ix;
bool same_file, unpaused;
char *curr_file, **args;
struct file_tags *curr_tags;
lists_t_strs *arg_list;
/* We only need to do OnSongChange tokenisation once. */
if (on_song_change == NULL) {
char *command;
on_song_change = lists_strs_new (4);
command = options_get_str ("OnSongChange");
if (command)
lists_strs_tokenise (on_song_change, command);
}
if (lists_strs_empty (on_song_change))
return;
curr_file = audio_get_sname ();
if (curr_file == NULL)
return;
same_file = (last_file && !strcmp (last_file, curr_file));
unpaused = (audio_get_prev_state () == STATE_PAUSE);
if (same_file && (unpaused || !options_get_bool ("RepeatSongChange"))) {
free (curr_file);
return;
}
curr_tags = tags_cache_get_immediate (tags_cache, curr_file,
TAGS_COMMENTS | TAGS_TIME);
arg_list = lists_strs_new (lists_strs_size (on_song_change));
for (ix = 0; ix < lists_strs_size (on_song_change); ix += 1) {
char *arg, *str;
arg = lists_strs_at (on_song_change, ix);
if (arg[0] != '%')
lists_strs_append (arg_list, arg);
else if (!curr_tags)
lists_strs_append (arg_list, "");
else {
switch (arg[1]) {
case 'a':
str = curr_tags->artist ? curr_tags->artist : "";
lists_strs_append (arg_list, str);
break;
case 'r':
str = curr_tags->album ? curr_tags->album : "";
lists_strs_append (arg_list, str);
break;
case 't':
str = curr_tags->title ? curr_tags->title : "";
lists_strs_append (arg_list, str);
break;
case 'n':
if (curr_tags->track >= 0) {
str = (char *) xmalloc (sizeof (char) * 16);
snprintf (str, 16, "%d", curr_tags->track);
lists_strs_push (arg_list, str);
}
else
lists_strs_append (arg_list, "");
break;
case 'f':
lists_strs_append (arg_list, curr_file);
break;
case 'D':
if (curr_tags->time >= 0) {
str = (char *) xmalloc (sizeof (char) * 16);
snprintf (str, 16, "%d", curr_tags->time);
lists_strs_push (arg_list, str);
}
else
lists_strs_append (arg_list, "");
break;
case 'd':
if (curr_tags->time >= 0) {
str = (char *) xmalloc (sizeof (char) * 32);
sec_to_min (str, curr_tags->time);
lists_strs_push (arg_list, str);
}
else
lists_strs_append (arg_list, "");
break;
default:
lists_strs_append (arg_list, arg);
}
}
}
tags_free (curr_tags);
#ifndef NDEBUG
{
char *cmd;
cmd = lists_strs_fmt (arg_list, " %s");
debug ("Running command: %s", cmd);
free (cmd);
}
#endif
switch (fork ()) {
case 0:
args = lists_strs_save (arg_list);
execve (args[0], args, environ);
fatal ("Error when running OnSongChange command '%s': %s",
args[0], xstrerror (errno));
case -1:
log_errno ("Failed to fork()", errno);
}
lists_strs_free (arg_list);
free (last_file);
last_file = curr_file;
}
/* Return true iff 'event' is a playlist event. */
static inline bool is_plist_event (const int event)
{
bool result = false;
switch (event) {
case EV_PLIST_ADD:
case EV_PLIST_DEL:
case EV_PLIST_MOVE:
case EV_PLIST_CLEAR:
result = true;
}
return result;
}
static void add_event_all (const int event, const void *data)
{
int i;
int added = 0;
if (event == EV_STATE) {
switch (audio_get_state()) {
case STATE_PLAY:
on_song_change ();
break;
case STATE_STOP:
run_extern_cmd ("OnStop");
break;
}
}
for (i = 0; i < CLIENTS_MAX; i++) {
void *data_copy = NULL;
if (clients[i].socket == -1)
continue;
if (!clients[i].wants_plist_events && is_plist_event (event))
continue;
if (data) {
if (event == EV_PLIST_ADD
|| event == EV_QUEUE_ADD) {
data_copy = plist_new_item ();
plist_item_copy (data_copy, data);
}
else if (event == EV_PLIST_DEL
|| event == EV_QUEUE_DEL
|| event == EV_STATUS_MSG
|| event == EV_SRV_ERROR) {
data_copy = xstrdup (data);
}
else if (event == EV_PLIST_MOVE
|| event == EV_QUEUE_MOVE)
data_copy = move_ev_data_dup (
(struct move_ev_data *)
data);
else
logit ("Unhandled data!");
}
add_event (&clients[i], event, data_copy);
added++;
}
if (added)
wake_up_server ();
else
debug ("No events have been added because there are no clients");
}
/* Send events from the queue. Return 0 on error. */
static int flush_events (struct client *cli)
{
enum noblock_io_status st = NB_IO_OK;
LOCK (cli->events_mtx);
while (!event_queue_empty(&cli->events)
&& (st = event_send_noblock(cli->socket, &cli->events))
== NB_IO_OK)
;
UNLOCK (cli->events_mtx);
return st != NB_IO_ERR ? 1 : 0;
}
/* Send events to clients whose sockets are ready to write. */
static void send_events (fd_set *fds)
{
int i;
for (i = 0; i < CLIENTS_MAX; i++)
if (clients[i].socket != -1
&& FD_ISSET(clients[i].socket, fds)) {
debug ("Flushing events for client %d", i);
if (!flush_events (&clients[i])) {
close (clients[i].socket);
del_client (&clients[i]);
}
}
}
/* End playing and cleanup. */
static void server_shutdown ()
{
logit ("Server exiting...");
audio_exit ();
tags_cache_free (tags_cache);
tags_cache = NULL;
logit ("Running OnServerStop");
run_extern_cmd ("OnServerStop");
unlink (socket_name());
unlink (create_file_name(PID_FILE));
close (wake_up_pipe[0]);
close (wake_up_pipe[1]);
logit ("Server exited");
log_close ();
}
/* Send EV_BUSY message and close the connection. */
static void busy (int sock)
{
logit ("Closing connection due to maximum number of clients reached");
send_int (sock, EV_BUSY);
close (sock);
}
/* Handle CMD_LIST_ADD, return 1 if ok or 0 on error. */
static int req_list_add (struct client *cli)
{
char *file;
file = get_str (cli->socket);
if (!file)
return 0;
logit ("Adding '%s' to the list", file);
audio_plist_add (file);
free (file);
return 1;
}
/* Handle CMD_QUEUE_ADD, return 1 if ok or 0 on error. */
static int req_queue_add (const struct client *cli)
{
char *file;
struct plist_item *item;
file = get_str (cli->socket);
if (!file)
return 0;
logit ("Adding '%s' to the queue", file);
audio_queue_add (file);
/* Wrap the filename in struct plist_item.
* We don't need tags, because the player gets them
* when playing the file. This may change if there is
* support for viewing/reordering the queue and here
* is the place to read the tags and fill them into
* the item. */
item = plist_new_item ();
item->file = xstrdup (file);
item->type = file_type (file);
item->mtime = get_mtime (file);
add_event_all (EV_QUEUE_ADD, item);
plist_free_item_fields (item);
free (item);
free (file);
return 1;
}
/* Handle CMD_PLAY, return 1 if ok or 0 on error. */
static int req_play (struct client *cli)
{
char *file;
if (!(file = get_str(cli->socket)))
return 0;
logit ("Playing %s", *file ? file : "first element on the list");
audio_play (file);
free (file);
return 1;
}
/* Handle CMD_SEEK, return 1 if ok or 0 on error */
static int req_seek (struct client *cli)
{
int sec;
if (!get_int(cli->socket, &sec))
return 0;
logit ("Seeking %ds", sec);
audio_seek (sec);
return 1;
}
/* Handle CMD_JUMP_TO, return 1 if ok or 0 on error */
static int req_jump_to (struct client *cli)
{
int sec;
if (!get_int(cli->socket, &sec))
return 0;
logit ("Jumping to %ds", sec);
audio_jump_to (sec);
return 1;
}
/* Report an error logging it and sending a message to the client. */
void server_error (const char *file, int line, const char *function,
const char *msg)
{
internal_logit (file, line, function, "ERROR: %s", msg);
add_event_all (EV_SRV_ERROR, msg);
}
/* Send the song name to the client. Return 0 on error. */
static int send_sname (struct client *cli)
{
int status = 1;
char *sname = audio_get_sname ();
if (!send_data_str(cli, sname ? sname : ""))
status = 0;
free (sname);
return status;
}
/* Return 0 if an option is valid when getting/setting with the client. */
static int valid_sync_option (const char *name)
{
return !strcasecmp(name, "ShowStreamErrors")
|| !strcasecmp(name, "Repeat")
|| !strcasecmp(name, "Shuffle")
|| !strcasecmp(name, "AutoNext");
}
/* Send requested option value to the client. Return 1 if OK. */
static int send_option (struct client *cli)
{
char *name;
if (!(name = get_str(cli->socket)))
return 0;
/* We can send only a few options, others make no sense here. */
if (!valid_sync_option(name)) {
logit ("Client wanted to get invalid option '%s'", name);
free (name);
return 0;
}
/* All supported options are boolean type. */
if (!send_data_bool(cli, options_get_bool(name))) {
free (name);
return 0;
}
free (name);
return 1;
}
/* Get and set an option from the client. Return 1 on error. */
static int get_set_option (struct client *cli)
{
char *name;
int val;
if (!(name = get_str (cli->socket)))
return 0;
if (!valid_sync_option (name)) {
logit ("Client requested setting invalid option '%s'", name);
return 0;
}
if (!get_int (cli->socket, &val)) {
free (name);
return 0;
}
options_set_bool (name, val ? true : false);
free (name);
add_event_all (EV_OPTIONS, NULL);
return 1;
}
/* Set the mixer to the value provided by the client. Return 0 on error. */
static int set_mixer (struct client *cli)
{
int val;
if (!get_int(cli->socket, &val))
return 0;
audio_set_mixer (val);
return 1;
}
/* Delete an item from the playlist. Return 0 on error. */
static int delete_item (struct client *cli)
{
char *file;
if (!(file = get_str(cli->socket)))
return 0;
debug ("Request for deleting %s", file);
audio_plist_delete (file);
free (file);
return 1;
}
static int req_queue_del (const struct client *cli)
{
char *file;
if (!(file = get_str(cli->socket)))
return 0;
debug ("Deleting '%s' from queue", file);
audio_queue_delete (file);
add_event_all (EV_QUEUE_DEL, file);
free (file);
return 1;
}
/* Return the index of the first client able to send the playlist or -1 if
* there isn't any. */
static int find_sending_plist ()
{
int i;
for (i = 0; i < CLIENTS_MAX; i++)
if (clients[i].socket != -1 && clients[i].can_send_plist)
return i;
return -1;
}
/* Handle CMD_GET_PLIST. Return 0 on error. */
static int get_client_plist (struct client *cli)
{
int first;
debug ("Client with fd %d requests the playlist", cli->socket);
/* Find the first connected client, and ask it to send the playlist.
* Here, send 1 if there is a client with the playlist, or 0 if there
* isn't. */
cli->requests_plist = 1;
first = find_sending_plist ();
if (first == -1) {
debug ("No clients with the playlist");
cli->requests_plist = 0;
if (!send_data_int(cli, 0))
return 0;
return 1;
}
if (!send_data_int(cli, 1))
return 0;
if (!send_int(clients[first].socket, EV_SEND_PLIST))
return 0;
return 1;
}
/* Find the client requesting the playlist. */
static int find_cli_requesting_plist ()
{
int i;
for (i = 0; i < CLIENTS_MAX; i++)
if (clients[i].requests_plist)
return i;
return -1;
}