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/* MiniDLNA media server
* Copyright (C) 2008-2010 Justin Maggard
*
* This file is part of MiniDLNA.
*
* MiniDLNA is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* MiniDLNA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MiniDLNA. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#ifdef HAVE_INOTIFY
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <dirent.h>
#include <libgen.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <poll.h>
#ifdef HAVE_SYS_INOTIFY_H
#include <sys/inotify.h>
#else
#include "linux/inotify.h"
#include "linux/inotify-syscalls.h"
#endif
#include "libav.h"
#include "upnpglobalvars.h"
#include "inotify.h"
#include "utils.h"
#include "sql.h"
#include "scanner.h"
#include "metadata.h"
#include "albumart.h"
#include "playlist.h"
#include "log.h"
#define EVENT_SIZE ( sizeof (struct inotify_event) )
#define BUF_LEN ( 1024 * ( EVENT_SIZE + 16 ) )
#define DESIRED_WATCH_LIMIT 65536
#define PATH_BUF_SIZE PATH_MAX
struct watch
{
int wd; /* watch descriptor */
char *path; /* watched path */
struct watch *next;
};
static struct watch *watches;
static struct watch *lastwatch = NULL;
static time_t next_pl_fill = 0;
char *get_path_from_wd(int wd)
{
struct watch *w = watches;
while( w != NULL )
{
if( w->wd == wd )
return w->path;
w = w->next;
}
return NULL;
}
int
add_watch(int fd, const char * path)
{
struct watch *nw;
int wd;
wd = inotify_add_watch(fd, path, IN_CREATE|IN_CLOSE_WRITE|IN_DELETE|IN_MOVE);
if( wd < 0 )
{
DPRINTF(E_ERROR, L_INOTIFY, "inotify_add_watch(%s) [%s]\n", path, strerror(errno));
return -1;
}
nw = malloc(sizeof(struct watch));
if( nw == NULL )
{
DPRINTF(E_ERROR, L_INOTIFY, "malloc() error\n");
return -1;
}
nw->wd = wd;
nw->next = NULL;
nw->path = strdup(path);
if( watches == NULL )
{
watches = nw;
}
if( lastwatch != NULL )
{
lastwatch->next = nw;
}
lastwatch = nw;
return wd;
}
int
remove_watch(int fd, const char * path)
{
struct watch *w;
for( w = watches; w; w = w->next )
{
if( strcmp(path, w->path) == 0 )
return(inotify_rm_watch(fd, w->wd));
}
return 1;
}
unsigned int
next_highest(unsigned int num)
{
num |= num >> 1;
num |= num >> 2;
num |= num >> 4;
num |= num >> 8;
num |= num >> 16;
return(++num);
}
int
inotify_create_watches(int fd)
{
FILE * max_watches;
unsigned int num_watches = 0, watch_limit;
char **result;
int i, rows = 0;
struct media_dir_s * media_path;
for( media_path = media_dirs; media_path != NULL; media_path = media_path->next )
{
DPRINTF(E_DEBUG, L_INOTIFY, "Add watch to %s\n", media_path->path);
add_watch(fd, media_path->path);
num_watches++;
}
sql_get_table(db, "SELECT PATH from DETAILS where MIME is NULL and PATH is not NULL", &result, &rows, NULL);
for( i=1; i <= rows; i++ )
{
DPRINTF(E_DEBUG, L_INOTIFY, "Add watch to %s\n", result[i]);
add_watch(fd, result[i]);
num_watches++;
}
sqlite3_free_table(result);
max_watches = fopen("/proc/sys/fs/inotify/max_user_watches", "r");
if( max_watches )
{
if( fscanf(max_watches, "%10u", &watch_limit) < 1 )
watch_limit = 8192;
fclose(max_watches);
if( (watch_limit < DESIRED_WATCH_LIMIT) || (watch_limit < (num_watches*4/3)) )
{
max_watches = fopen("/proc/sys/fs/inotify/max_user_watches", "w");
if( max_watches )
{
if( DESIRED_WATCH_LIMIT >= (num_watches*3/4) )
{
fprintf(max_watches, "%u", DESIRED_WATCH_LIMIT);
}
else if( next_highest(num_watches) >= (num_watches*3/4) )
{
fprintf(max_watches, "%u", next_highest(num_watches));
}
else
{
fprintf(max_watches, "%u", next_highest(next_highest(num_watches)));
}
fclose(max_watches);
}
else
{
DPRINTF(E_WARN, L_INOTIFY, "WARNING: Inotify max_user_watches [%u] is low or close to the number of used watches [%u] "
"and I do not have permission to increase this limit. Please do so manually by "
"writing a higher value into /proc/sys/fs/inotify/max_user_watches.\n", watch_limit, num_watches);
}
}
}
else
{
DPRINTF(E_WARN, L_INOTIFY, "WARNING: Could not read inotify max_user_watches! "
"Hopefully it is enough to cover %u current directories plus any new ones added.\n", num_watches);
}
return rows;
}
int
inotify_remove_watches(int fd)
{
struct watch *w = watches;
struct watch *last_w;
int rm_watches = 0;
while( w )
{
last_w = w;
inotify_rm_watch(fd, w->wd);
free(w->path);
rm_watches++;
w = w->next;
free(last_w);
}
return rm_watches;
}
int add_dir_watch(int fd, char * path, char * filename)
{
DIR *ds;
struct dirent *e;
char *dir;
char buf[PATH_MAX];
int wd;
int i = 0;
if( filename )
{
snprintf(buf, sizeof(buf), "%s/%s", path, filename);
dir = buf;
}
else
dir = path;
wd = add_watch(fd, dir);
if( wd == -1 )
{
DPRINTF(E_ERROR, L_INOTIFY, "add_watch() [%s]\n", strerror(errno));
}
else
{
DPRINTF(E_INFO, L_INOTIFY, "Added watch to %s [%d]\n", dir, wd);
}
ds = opendir(dir);
if( ds != NULL )
{
while( (e = readdir(ds)) )
{
if( strcmp(e->d_name, ".") == 0 ||
strcmp(e->d_name, "..") == 0 )
continue;
if( (e->d_type == DT_DIR) ||
(e->d_type == DT_UNKNOWN && resolve_unknown_type(dir, NO_MEDIA) == TYPE_DIR) )
i += add_dir_watch(fd, dir, e->d_name);
}
}
else
{
DPRINTF(E_ERROR, L_INOTIFY, "Opendir error! [%s]\n", strerror(errno));
}
closedir(ds);
i++;
return(i);
}
int
inotify_insert_file(char * name, const char * path)
{
int len;
char * last_dir;
char * path_buf;
char * base_name;
char * base_copy;
char * parent_buf = NULL;
char * id = NULL;
int depth = 1;
int ts;
enum media_types type = ALL_MEDIA;
struct media_dir_s * media_path = media_dirs;
struct stat st;
/* Is it cover art for another file? */
if( is_image(path) )
update_if_album_art(path);
else if( ends_with(path, ".srt") )
check_for_captions(path, 0);
/* Check if we're supposed to be scanning for this file type in this directory */
while( media_path )
{
if( strncmp(path, media_path->path, strlen(media_path->path)) == 0 )
{
type = media_path->type;
break;
}
media_path = media_path->next;
}
switch( type )
{
case ALL_MEDIA:
if( !is_image(path) &&
!is_audio(path) &&
!is_video(path) &&
!is_playlist(path) )
return -1;
break;
case AUDIO_ONLY:
if( !is_audio(path) &&
!is_playlist(path) )
return -1;
break;
case VIDEO_ONLY:
if( !is_video(path) )
return -1;
break;
case IMAGES_ONLY:
if( !is_image(path) )
return -1;
break;
default:
return -1;
break;
}
/* If it's already in the database and hasn't been modified, skip it. */
if( stat(path, &st) != 0 )
return -1;
ts = sql_get_int_field(db, "SELECT TIMESTAMP from DETAILS where PATH = '%q'", path);
if( !ts && is_playlist(path) && (sql_get_int_field(db, "SELECT ID from PLAYLISTS where PATH = '%q'", path) > 0) )
{
DPRINTF(E_DEBUG, L_INOTIFY, "Re-reading modified playlist.\n", path);
inotify_remove_file(path);
next_pl_fill = 1;
}
else if( ts < st.st_mtime )
{
if( ts > 0 )
DPRINTF(E_DEBUG, L_INOTIFY, "%s is newer than the last db entry.\n", path);
inotify_remove_file(path);
}
/* Find the parentID. If it's not found, create all necessary parents. */
len = strlen(path)+1;
if( !(path_buf = malloc(len)) ||
!(last_dir = malloc(len)) ||
!(base_name = malloc(len)) )
return -1;
base_copy = base_name;
while( depth )
{
depth = 0;
strcpy(path_buf, path);
parent_buf = dirname(path_buf);
do
{
//DEBUG DPRINTF(E_DEBUG, L_INOTIFY, "Checking %s\n", parent_buf);
id = sql_get_text_field(db, "SELECT OBJECT_ID from OBJECTS o left join DETAILS d on (d.ID = o.DETAIL_ID)"
" where d.PATH = '%q' and REF_ID is NULL", parent_buf);
if( id )
{
if( !depth )
break;
DPRINTF(E_DEBUG, L_INOTIFY, "Found first known parentID: %s [%s]\n", id, parent_buf);
/* Insert newly-found directory */
strcpy(base_name, last_dir);
base_copy = basename(base_name);
insert_directory(base_copy, last_dir, BROWSEDIR_ID, id+2, get_next_available_id("OBJECTS", id));
sqlite3_free(id);
break;
}
depth++;
strcpy(last_dir, parent_buf);
parent_buf = dirname(parent_buf);
}
while( strcmp(parent_buf, "/") != 0 );
if( strcmp(parent_buf, "/") == 0 )
{
id = sqlite3_mprintf("%s", BROWSEDIR_ID);
depth = 0;
break;
}
strcpy(path_buf, path);
}
free(last_dir);
free(path_buf);
free(base_name);
if( !depth )
{
//DEBUG DPRINTF(E_DEBUG, L_INOTIFY, "Inserting %s\n", name);
insert_file(name, path, id+2, get_next_available_id("OBJECTS", id));
sqlite3_free(id);
if( (is_audio(path) || is_playlist(path)) && next_pl_fill != 1 )
{
next_pl_fill = time(NULL) + 120; // Schedule a playlist scan for 2 minutes from now.
//DEBUG DPRINTF(E_WARN, L_INOTIFY, "Playlist scan scheduled for %s", ctime(&next_pl_fill));
}
}
return depth;
}
int
inotify_insert_directory(int fd, char *name, const char * path)
{
DIR * ds;
struct dirent * e;
char *id, *parent_buf, *esc_name;
char path_buf[PATH_MAX];
int wd;
enum file_types type = TYPE_UNKNOWN;
enum media_types dir_type = ALL_MEDIA;
struct media_dir_s * media_path;
struct stat st;
if( access(path, R_OK|X_OK) != 0 )
{
DPRINTF(E_WARN, L_INOTIFY, "Could not access %s [%s]\n", path, strerror(errno));
return -1;
}
if( sql_get_int_field(db, "SELECT ID from DETAILS where PATH = '%q'", path) > 0 )
{
DPRINTF(E_DEBUG, L_INOTIFY, "%s already exists\n", path);
return 0;
}
parent_buf = strdup(path);
id = sql_get_text_field(db, "SELECT OBJECT_ID from OBJECTS o left join DETAILS d on (d.ID = o.DETAIL_ID)"
" where d.PATH = '%q' and REF_ID is NULL", dirname(parent_buf));
if( !id )
id = sqlite3_mprintf("%s", BROWSEDIR_ID);
insert_directory(name, path, BROWSEDIR_ID, id+2, get_next_available_id("OBJECTS", id));
sqlite3_free(id);
free(parent_buf);
wd = add_watch(fd, path);
if( wd == -1 )
{
DPRINTF(E_ERROR, L_INOTIFY, "add_watch() failed\n");
}
else
{
DPRINTF(E_INFO, L_INOTIFY, "Added watch to %s [%d]\n", path, wd);
}
media_path = media_dirs;
while( media_path )
{
if( strncmp(path, media_path->path, strlen(media_path->path)) == 0 )
{
dir_type = media_path->type;
break;
}
media_path = media_path->next;
}
ds = opendir(path);
if( !ds )
{
DPRINTF(E_ERROR, L_INOTIFY, "opendir failed! [%s]\n", strerror(errno));
return -1;
}
while( (e = readdir(ds)) )
{
if( e->d_name[0] == '.' )
continue;
esc_name = escape_tag(e->d_name, 1);
snprintf(path_buf, sizeof(path_buf), "%s/%s", path, e->d_name);
switch( e->d_type )
{
case DT_DIR:
case DT_REG:
case DT_LNK:
case DT_UNKNOWN:
type = resolve_unknown_type(path_buf, dir_type);
default:
break;
}
if( type == TYPE_DIR )
{
inotify_insert_directory(fd, esc_name, path_buf);
}
else if( type == TYPE_FILE )
{
if( (stat(path_buf, &st) == 0) && (st.st_blocks<<9 >= st.st_size) )
{
inotify_insert_file(esc_name, path_buf);
}
}
free(esc_name);
}
closedir(ds);
return 0;
}
int
inotify_remove_file(const char * path)
{
char sql[128];
char art_cache[PATH_MAX];
char *id;
char *ptr;
char **result;
int64_t detailID;
int rows, playlist;
if( ends_with(path, ".srt") )
{
rows = sql_exec(db, "DELETE from CAPTIONS where PATH = '%q'", path);
return rows;
}
/* Invalidate the scanner cache so we don't insert files into non-existent containers */
valid_cache = 0;
playlist = is_playlist(path);
id = sql_get_text_field(db, "SELECT ID from %s where PATH = '%q'", playlist?"PLAYLISTS":"DETAILS", path);
if( !id )
return 1;
detailID = strtoll(id, NULL, 10);
sqlite3_free(id);
if( playlist )
{
sql_exec(db, "DELETE from PLAYLISTS where ID = %lld", detailID);
sql_exec(db, "DELETE from DETAILS where ID ="
" (SELECT DETAIL_ID from OBJECTS where OBJECT_ID = '%s$%llX')",
MUSIC_PLIST_ID, detailID);
sql_exec(db, "DELETE from OBJECTS where OBJECT_ID = '%s$%llX' or PARENT_ID = '%s$%llX'",
MUSIC_PLIST_ID, detailID, MUSIC_PLIST_ID, detailID);
}
else
{
/* Delete the parent containers if we are about to empty them. */
snprintf(sql, sizeof(sql), "SELECT PARENT_ID from OBJECTS where DETAIL_ID = %lld", (long long int)detailID);
if( (sql_get_table(db, sql, &result, &rows, NULL) == SQLITE_OK) )
{
int i, children;
for( i=1; i <= rows; i++ )
{
/* If it's a playlist item, adjust the item count of the playlist */
if( strncmp(result[i], MUSIC_PLIST_ID, strlen(MUSIC_PLIST_ID)) == 0 )
{
sql_exec(db, "UPDATE PLAYLISTS set FOUND = (FOUND-1) where ID = %d",
atoi(strrchr(result[i], '$') + 1));
}
children = sql_get_int_field(db, "SELECT count(*) from OBJECTS where PARENT_ID = '%s'", result[i]);
if( children < 0 )
continue;
if( children < 2 )
{
sql_exec(db, "DELETE from DETAILS where ID ="
" (SELECT DETAIL_ID from OBJECTS where OBJECT_ID = '%s')", result[i]);
sql_exec(db, "DELETE from OBJECTS where OBJECT_ID = '%s'", result[i]);
ptr = strrchr(result[i], '$');
if( ptr )
*ptr = '\0';
if( sql_get_int_field(db, "SELECT count(*) from OBJECTS where PARENT_ID = '%s'", result[i]) == 0 )
{
sql_exec(db, "DELETE from DETAILS where ID ="
" (SELECT DETAIL_ID from OBJECTS where OBJECT_ID = '%s')", result[i]);
sql_exec(db, "DELETE from OBJECTS where OBJECT_ID = '%s'", result[i]);
}
}
}
sqlite3_free_table(result);
}
/* Now delete the actual objects */
sql_exec(db, "DELETE from DETAILS where ID = %lld", detailID);
sql_exec(db, "DELETE from OBJECTS where DETAIL_ID = %lld", detailID);
}
snprintf(art_cache, sizeof(art_cache), "%s/art_cache%s", db_path, path);
remove(art_cache);
return 0;
}
int
inotify_remove_directory(int fd, const char * path)
{
char * sql;
char **result;
int64_t detailID = 0;
int rows, i, ret = 1;
/* Invalidate the scanner cache so we don't insert files into non-existent containers */
valid_cache = 0;
remove_watch(fd, path);
sql = sqlite3_mprintf("SELECT ID from DETAILS where (PATH > '%q/' and PATH <= '%q/%c')"
" or PATH = '%q'", path, path, 0xFF, path);
if( (sql_get_table(db, sql, &result, &rows, NULL) == SQLITE_OK) )
{
if( rows )
{
for( i=1; i <= rows; i++ )
{
detailID = strtoll(result[i], NULL, 10);
sql_exec(db, "DELETE from DETAILS where ID = %lld", detailID);
sql_exec(db, "DELETE from OBJECTS where DETAIL_ID = %lld", detailID);
}
ret = 0;
}
sqlite3_free_table(result);
}
sqlite3_free(sql);
/* Clean up any album art entries in the deleted directory */
sql_exec(db, "DELETE from ALBUM_ART where (PATH > '%q/' and PATH <= '%q/%c')", path, path, 0xFF);
return ret;
}
void *
start_inotify()
{
struct pollfd pollfds[1];
int timeout = 1000;
char buffer[BUF_LEN];
char path_buf[PATH_MAX];
int length, i = 0;
char * esc_name = NULL;
struct stat st;
pollfds[0].fd = inotify_init();
pollfds[0].events = POLLIN;
if ( pollfds[0].fd < 0 )
DPRINTF(E_ERROR, L_INOTIFY, "inotify_init() failed!\n");
while( scanning )
{
if( quitting )
goto quitting;
sleep(1);
}
inotify_create_watches(pollfds[0].fd);
if (setpriority(PRIO_PROCESS, 0, 19) == -1)
DPRINTF(E_WARN, L_INOTIFY, "Failed to reduce inotify thread priority\n");
sqlite3_release_memory(1<<31);
av_register_all();
while( !quitting )
{
length = poll(pollfds, 1, timeout);
if( !length )
{
if( next_pl_fill && (time(NULL) >= next_pl_fill) )
{
fill_playlists();
next_pl_fill = 0;
}
continue;
}
else if( length < 0 )
{
if( (errno == EINTR) || (errno == EAGAIN) )
continue;
else
DPRINTF(E_ERROR, L_INOTIFY, "read failed!\n");
}
else
{
length = read(pollfds[0].fd, buffer, BUF_LEN);
}
i = 0;
while( i < length )
{
struct inotify_event * event = (struct inotify_event *) &buffer[i];
if( event->len )
{
if( *(event->name) == '.' )
{
i += EVENT_SIZE + event->len;
continue;
}
esc_name = modifyString(strdup(event->name), "&", "&amp;amp;");
sprintf(path_buf, "%s/%s", get_path_from_wd(event->wd), event->name);
if ( event->mask & IN_ISDIR && (event->mask & (IN_CREATE|IN_MOVED_TO)) )
{
DPRINTF(E_DEBUG, L_INOTIFY, "The directory %s was %s.\n",
path_buf, (event->mask & IN_MOVED_TO ? "moved here" : "created"));
inotify_insert_directory(pollfds[0].fd, esc_name, path_buf);
}
else if ( (event->mask & (IN_CLOSE_WRITE|IN_MOVED_TO|IN_CREATE)) &&
(lstat(path_buf, &st) == 0) )
{
if( S_ISLNK(st.st_mode) )
{
DPRINTF(E_DEBUG, L_INOTIFY, "The symbolic link %s was %s.\n",
path_buf, (event->mask & IN_MOVED_TO ? "moved here" : "created"));
if( stat(path_buf, &st) == 0 && S_ISDIR(st.st_mode) )
inotify_insert_directory(pollfds[0].fd, esc_name, path_buf);
else
inotify_insert_file(esc_name, path_buf);
}
else if( event->mask & (IN_CLOSE_WRITE|IN_MOVED_TO) && st.st_size > 0 )
{
if( (event->mask & IN_MOVED_TO) ||
(sql_get_int_field(db, "SELECT TIMESTAMP from DETAILS where PATH = '%q'", path_buf) != st.st_mtime) )
{
DPRINTF(E_DEBUG, L_INOTIFY, "The file %s was %s.\n",
path_buf, (event->mask & IN_MOVED_TO ? "moved here" : "changed"));
inotify_insert_file(esc_name, path_buf);
}
}
}
else if ( event->mask & (IN_DELETE|IN_MOVED_FROM) )
{
DPRINTF(E_DEBUG, L_INOTIFY, "The %s %s was %s.\n",
(event->mask & IN_ISDIR ? "directory" : "file"),
path_buf, (event->mask & IN_MOVED_FROM ? "moved away" : "deleted"));
if ( event->mask & IN_ISDIR )
inotify_remove_directory(pollfds[0].fd, path_buf);
else
inotify_remove_file(path_buf);
}
free(esc_name);
}
i += EVENT_SIZE + event->len;
}
}
inotify_remove_watches(pollfds[0].fd);
quitting:
close(pollfds[0].fd);
return 0;
}
#endif