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/*
* MOC - music on console
* Copyright (C) 2004 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 <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <stdlib.h>
#include <dirent.h>
#ifdef HAVE_LIBMAGIC
#include <magic.h>
#include <pthread.h>
#endif
#define DEBUG
#include "common.h"
#include "playlist.h"
#include "lists.h"
#include "interface.h"
#include "decoder.h"
#include "options.h"
#include "files.h"
#include "playlist_file.h"
#include "log.h"
#include "utf8.h"
#define READ_LINE_INIT_SIZE 256
#ifdef HAVE_LIBMAGIC
static magic_t cookie = NULL;
static char *cached_file = NULL;
static char *cached_result = NULL;
#endif
void files_init ()
{
#ifdef HAVE_LIBMAGIC
assert (cookie == NULL);
cookie = magic_open (MAGIC_SYMLINK | MAGIC_MIME | MAGIC_ERROR |
MAGIC_NO_CHECK_COMPRESS | MAGIC_NO_CHECK_ELF |
MAGIC_NO_CHECK_TAR | MAGIC_NO_CHECK_TOKENS |
MAGIC_NO_CHECK_FORTRAN | MAGIC_NO_CHECK_TROFF);
if (cookie == NULL)
log_errno ("Error allocating magic cookie", errno);
else if (magic_load (cookie, NULL) != 0) {
logit ("Error loading magic database: %s", magic_error (cookie));
magic_close (cookie);
cookie = NULL;
}
#endif
}
void files_cleanup ()
{
#ifdef HAVE_LIBMAGIC
free (cached_file);
cached_file = NULL;
free (cached_result);
cached_result = NULL;
magic_close (cookie);
cookie = NULL;
#endif
}
/* Is the string a URL? */
inline int is_url (const char *str)
{
return !strncasecmp (str, "http://", sizeof ("http://") - 1)
|| !strncasecmp (str, "https://", sizeof ("https://") - 1)
|| !strncasecmp (str, "ftp://", sizeof ("ftp://") - 1);
}
/* Return 1 if the file is a directory, 0 if not, -1 on error. */
int is_dir (const char *file)
{
struct stat file_stat;
if (is_url (file))
return 0;
if (stat (file, &file_stat) == -1) {
char *err = xstrerror (errno);
error ("Can't stat %s: %s", file, err);
free (err);
return -1;
}
return S_ISDIR(file_stat.st_mode) ? 1 : 0;
}
/* Return 1 if the file can be read by this user, 0 if not */
int can_read_file (const char *file)
{
return access(file, R_OK) == 0;
}
enum file_type file_type (const char *file)
{
struct stat file_stat;
assert (file != NULL);
if (is_url(file))
return F_URL;
if (stat(file, &file_stat) == -1)
return F_OTHER; /* Ignore the file if stat() failed */
if (S_ISDIR(file_stat.st_mode))
return F_DIR;
if (is_sound_file(file))
return F_SOUND;
if (is_plist_file(file))
return F_PLAYLIST;
return F_OTHER;
}
/* Given a file name, return the mime type or NULL. */
char *file_mime_type (const char *file ASSERT_ONLY)
{
char *result = NULL;
assert (file != NULL);
#ifdef HAVE_LIBMAGIC
static pthread_mutex_t magic_mtx = PTHREAD_MUTEX_INITIALIZER;
if (cookie != NULL) {
LOCK(magic_mtx);
if (cached_file && !strcmp (cached_file, file))
result = xstrdup (cached_result);
else {
free (cached_file);
free (cached_result);
cached_file = cached_result = NULL;
result = xstrdup (magic_file (cookie, file));
if (result == NULL)
logit ("Error interrogating file: %s", magic_error (cookie));
else {
cached_file = xstrdup (file);
cached_result = xstrdup (result);
}
}
UNLOCK(magic_mtx);
}
#endif
return result;
}
/* Make a title from the file name for the item. If hide_extn != 0,
* strip the file name from extension. */
void make_file_title (struct plist *plist, const int num,
const bool hide_extension)
{
assert (plist != NULL);
assert (LIMIT(num, plist->num));
assert (!plist_deleted (plist, num));
if (file_type (plist->items[num].file) != F_URL) {
char *file = xstrdup (plist->items[num].file);
if (hide_extension) {
char *extn;
extn = ext_pos (file);
if (extn)
*(extn - 1) = 0;
}
if (options_get_bool ("FileNamesIconv"))
{
char *old_title = file;
file = files_iconv_str (file);
free (old_title);
}
plist_set_title_file (plist, num, file);
free (file);
}
else
plist_set_title_file (plist, num, plist->items[num].file);
}
/* Make a title from the tags for the item. */
void make_tags_title (struct plist *plist, const int num)
{
bool hide_extn;
char *title;
assert (plist != NULL);
assert (LIMIT(num, plist->num));
assert (!plist_deleted (plist, num));
if (file_type (plist->items[num].file) == F_URL) {
make_file_title (plist, num, false);
return;
}
if (plist->items[num].title_tags)
return;
assert (plist->items[num].file != NULL);
if (plist->items[num].tags->title) {
title = build_title (plist->items[num].tags);
plist_set_title_tags (plist, num, title);
free (title);
return;
}
hide_extn = options_get_bool ("HideFileExtension");
make_file_title (plist, num, hide_extn);
}
/* Switch playlist titles to title_file */
void switch_titles_file (struct plist *plist)
{
int i;
bool hide_extn;
hide_extn = options_get_bool ("HideFileExtension");
for (i = 0; i < plist->num; i++) {
if (plist_deleted (plist, i))
continue;
if (!plist->items[i].title_file)
make_file_title (plist, i, hide_extn);
assert (plist->items[i].title_file != NULL);
}
}
/* Switch playlist titles to title_tags */
void switch_titles_tags (struct plist *plist)
{
int i;
bool hide_extn;
hide_extn = options_get_bool ("HideFileExtension");
for (i = 0; i < plist->num; i++) {
if (plist_deleted (plist, i))
continue;
if (!plist->items[i].title_tags && !plist->items[i].title_file)
make_file_title (plist, i, hide_extn);
}
}
/* Add file to the directory path in buf resolving '../' and removing './'. */
/* buf must be absolute path. */
void resolve_path (char *buf, size_t size, const char *file)
{
int rc;
char *f; /* points to the char in *file we process */
char path[2*PATH_MAX]; /* temporary path */
size_t len = 0; /* number of characters in the buffer */
assert (buf[0] == '/');
rc = snprintf(path, sizeof(path), "%s/%s/", buf, file);
if (rc >= ssizeof(path))
fatal ("Path too long!");
f = path;
while (*f) {
if (!strncmp(f, "/../", 4)) {
char *slash = strrchr (buf, '/');
assert (slash != NULL);
if (slash == buf) {
/* make '/' from '/directory' */
buf[1] = 0;
len = 1;
}
else {
/* strip one element */
*(slash) = 0;
len -= len - (slash - buf);
buf[len] = 0;
}
f+= 3;
}
else if (!strncmp(f, "/./", 3))
/* skip '/.' */
f += 2;
else if (!strncmp(f, "//", 2))
/* remove double slash */
f++;
else if (len == size - 1)
fatal ("Path too long!");
else {
buf[len++] = *(f++);
buf[len] = 0;
}
}
/* remove dot from '/dir/.' */
if (len >= 2 && buf[len-1] == '.' && buf[len-2] == '/')
buf[--len] = 0;
/* strip trailing slash */
if (len > 1 && buf[len-1] == '/')
buf[--len] = 0;
}
/* Read selected tags for a file into tags structure (or create it if NULL).
* If some tags are already present, don't read them.
* If present_tags is NULL, allocate new tags. */
struct file_tags *read_file_tags (const char *file,
struct file_tags *tags, const int tags_sel)
{
struct decoder *df;
int needed_tags;
assert (file != NULL);
if (tags == NULL)
tags = tags_new ();
if (file_type (file) == F_URL)
return tags;
needed_tags = ~tags->filled & tags_sel;
if (!needed_tags) {
debug ("No need to read any tags");
return tags;
}
df = get_decoder (file);
if (!df) {
logit ("Can't find decoder functions for %s", file);
return tags;
}
/* This makes sure that we don't cause a memory leak */
assert (!((needed_tags & TAGS_COMMENTS) &&
(tags->title || tags->artist || tags->album)));
df->info (file, tags, needed_tags);
tags->filled |= tags_sel;
return tags;
}
/* Read the content of the directory, make an array of absolute paths for
* all recognized files. Put directories, playlists and sound files
* in proper structures. Return 0 on error.*/
int read_directory (const char *directory, lists_t_strs *dirs,
lists_t_strs *playlists, struct plist *plist)
{
DIR *dir;
struct dirent *entry;
bool show_hidden = options_get_bool ("ShowHiddenFiles");
int dir_is_root;
assert (directory != NULL);
assert (*directory == '/');
assert (dirs != NULL);
assert (playlists != NULL);
assert (plist != NULL);
if (!(dir = opendir(directory))) {
error_errno ("Can't read directory", errno);
return 0;
}
if (!strcmp(directory, "/"))
dir_is_root = 1;
else
dir_is_root = 0;
while ((entry = readdir(dir))) {
int rc;
char file[PATH_MAX];
enum file_type type;
if (user_wants_interrupt()) {
error ("Interrupted! Not all files read!");
break;
}
if (!strcmp(entry->d_name, ".") || !strcmp(entry->d_name, ".."))
continue;
if (!show_hidden && entry->d_name[0] == '.')
continue;
rc = snprintf(file, sizeof(file), "%s/%s",
dir_is_root ? "" : directory, entry->d_name);
if (rc >= ssizeof(file)) {
error ("Path too long!");
closedir (dir);
return 0;
}
type = file_type (file);
if (type == F_SOUND)
plist_add (plist, file);
else if (type == F_DIR)
lists_strs_append (dirs, file);
else if (type == F_PLAYLIST)
lists_strs_append (playlists, file);
}
closedir (dir);
return 1;
}
static int dir_symlink_loop (const ino_t inode_no, const ino_t *dir_stack,
const int depth)
{
int i;
for (i = 0; i < depth; i++)
if (dir_stack[i] == inode_no)
return 1;
return 0;
}
/* Recursively add files from the directory to the playlist.
* Return 1 if OK (and even some errors), 0 if the user interrupted. */
static int read_directory_recurr_internal (const char *directory, struct plist *plist,
ino_t **dir_stack, int *depth)
{
DIR *dir;
struct dirent *entry;
struct stat st;
if (stat (directory, &st)) {
char *err = xstrerror (errno);
error ("Can't stat %s: %s", directory, err);
free (err);
return 0;
}
assert (plist != NULL);
assert (directory != NULL);
if (*dir_stack && dir_symlink_loop(st.st_ino, *dir_stack, *depth)) {
logit ("Detected symlink loop on %s", directory);
return 1;
}
if (!(dir = opendir(directory))) {
error_errno ("Can't read directory", errno);
return 1;
}
(*depth)++;
*dir_stack = (ino_t *)xrealloc (*dir_stack, sizeof(ino_t) * (*depth));
(*dir_stack)[*depth - 1] = st.st_ino;
while ((entry = readdir(dir))) {
int rc;
char file[PATH_MAX];
enum file_type type;
if (user_wants_interrupt()) {
error ("Interrupted! Not all files read!");
break;
}
if (!strcmp(entry->d_name, ".") || !strcmp(entry->d_name, ".."))
continue;
rc = snprintf(file, sizeof(file), "%s/%s", directory, entry->d_name);
if (rc >= ssizeof(file)) {
error ("Path too long!");
continue;
}
type = file_type (file);
if (type == F_DIR)
read_directory_recurr_internal(file, plist, dir_stack, depth);
else if (type == F_SOUND && plist_find_fname(plist, file) == -1)
plist_add (plist, file);
}
(*depth)--;
*dir_stack = (ino_t *)xrealloc (*dir_stack, sizeof(ino_t) * (*depth));
closedir (dir);
return 1;
}
int read_directory_recurr (const char *directory, struct plist *plist)
{
int ret;
int depth = 0;
ino_t *dir_stack = NULL;
ret = read_directory_recurr_internal (directory, plist, &dir_stack,
&depth);
if (dir_stack)
free (dir_stack);
return ret;
}
/* Return the file extension position or NULL if the file has no extension. */
char *ext_pos (const char *file)
{
char *ext = strrchr (file, '.');
char *slash = strrchr (file, '/');
/* don't treat dot in ./file or /.file as a dot before extension */
if (ext && (!slash || slash < ext) && ext != file && *(ext-1) != '/')
ext++;
else
ext = NULL;
return ext;
}
/* Read one line from a file, strip trailing end of line chars.
* Returned memory is malloc()ed. Return NULL on error or EOF. */
char *read_line (FILE *file)
{
int line_alloc = READ_LINE_INIT_SIZE;
int len = 0;
char *line = (char *)xmalloc (sizeof(char) * line_alloc);
while (1) {
if (!fgets(line + len, line_alloc - len, file))
break;
len = strlen(line);
if (line[len-1] == '\n')
break;
/* If we are here, it means that line is longer than the buffer. */
line_alloc *= 2;
line = (char *)xrealloc (line, sizeof(char) * line_alloc);
}
if (len == 0) {
free (line);
return NULL;
}
if (line[len-1] == '\n')
line[--len] = 0;
if (len > 0 && line[len-1] == '\r')
line[--len] = 0;
return line;
}
/* Return malloc()ed string in form "base/name". */
static char *add_dir_file (const char *base, const char *name)
{
char *path;
int base_is_root;
base_is_root = !strcmp (base, "/") ? 1 : 0;
path = (char *)xmalloc (sizeof(char) *
(strlen(base) + strlen(name) + 2));
sprintf (path, "%s/%s", base_is_root ? "" : base, name);
return path;
}
/* Find directories having a prefix of 'pattern'.
* - If there are no matches, NULL is returned.
* - If there is one such directory, it is returned with a trailing '/'.
* - Otherwise the longest common prefix is returned (with no trailing '/').
* (This is used for directory auto-completion.)
* Returned memory is malloc()ed.
* 'pattern' is temporarily modified! */
char *find_match_dir (char *pattern)
{
char *slash;
DIR *dir;
struct dirent *entry;
int name_len;
char *name;
char *matching_dir = NULL;
char *search_dir;
int unambiguous = 1;
if (!pattern[0])
return NULL;
/* strip the last directory */
slash = strrchr (pattern, '/');
if (!slash)
return NULL;
if (slash == pattern) {
/* only '/dir' */
search_dir = xstrdup ("/");
}
else {
*slash = 0;
search_dir = xstrdup (pattern);
*slash = '/';
}
name = slash + 1;
name_len = strlen (name);
if (!(dir = opendir(search_dir)))
return NULL;
while ((entry = readdir(dir))) {
if (strcmp(entry->d_name, ".") && strcmp(entry->d_name, "..")
&& !strncmp(entry->d_name, name, name_len)) {
char *path = add_dir_file (search_dir, entry->d_name);
if (is_dir(path) == 1) {
if (matching_dir) {
/* More matching directories - strip
* matching_dir to the part that is
* common to both paths */
int i = 0;
while (matching_dir[i] == path[i]
&& path[i])
i++;
matching_dir[i] = 0;
free (path);
unambiguous = 0;
}
else
matching_dir = path;
}
else
free (path);
}
}
closedir (dir);
free (search_dir);
if (matching_dir && unambiguous) {
matching_dir = (char *)xrealloc (matching_dir,
sizeof(char) * (strlen(matching_dir) + 2));
strcat (matching_dir, "/");
}
return matching_dir;
}
/* Return != 0 if the file exists. */
int file_exists (const char *file)
{
struct stat file_stat;
if (!stat(file, &file_stat))
return 1;
/* Log any error other than non-existence. */
if (errno != ENOENT)
log_errno ("Error", errno);
return 0;
}
/* Get the modification time of a file. Return (time_t)-1 on error */
time_t get_mtime (const char *file)
{
struct stat stat_buf;
if (stat(file, &stat_buf) != -1)
return stat_buf.st_mtime;
return (time_t)-1;
}
/* Convert file path to absolute path;
* resulting string is allocated and must be freed afterwards. */
char *absolute_path (const char *path, const char *cwd)
{
char tmp[2*PATH_MAX];
char *result;
assert (path);
assert (cwd);
if(path[0] != '/' && !is_url(path)) {
strncpy (tmp, cwd, sizeof(tmp));
tmp[sizeof(tmp)-1] = 0;
resolve_path (tmp, sizeof(tmp), path);
result = (char *)xmalloc (sizeof(char) * (strlen(tmp)+1));
strcpy (result, tmp);
}
else {
result = (char *)xmalloc (sizeof(char) * (strlen(path)+1));
strcpy (result, path);
}
return result;
}
/* Check that a file which may cause other applications to be invoked
* is secure against tampering. */
bool is_secure (const char *file)
{
struct stat sb;
assert (file && file[0]);
if (stat (file, &sb) == -1)
return true;
if (!S_ISREG(sb.st_mode))
return false;
if (sb.st_mode & (S_IWGRP|S_IWOTH))
return false;
if (sb.st_uid != 0 && sb.st_uid != geteuid ())
return false;
return true;
}
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