mpv/options/path.c

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/*
* This file is part of mpv.
*
* Get path to config dir/file.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include "config.h"
#include "common/common.h"
#include "common/global.h"
#include "common/msg.h"
#include "options/options.h"
#include "options/path.h"
#include "mpv_talloc.h"
#include "osdep/io.h"
#include "osdep/path.h"
#include "misc/ctype.h"
// In order of decreasing priority: the first has highest priority.
static const mp_get_platform_path_cb path_resolvers[] = {
#if HAVE_COCOA
mp_get_platform_path_osx,
#endif
#if !defined(_WIN32) || defined(__CYGWIN__)
mp_get_platform_path_unix,
#endif
#if HAVE_UWP
mp_get_platform_path_uwp,
#elif defined(_WIN32)
mp_get_platform_path_win,
#endif
};
// from highest (most preferred) to lowest priority
static const char *const config_dirs[] = {
"home",
"old_home",
"osxbundle",
"exe_dir",
"global",
};
void mp_init_paths(struct mpv_global *global, struct MPOpts *opts)
{
TA_FREEP(&global->configdir);
const char *force_configdir = getenv("MPV_HOME");
if (opts->force_configdir && opts->force_configdir[0])
force_configdir = opts->force_configdir;
if (!opts->load_config)
force_configdir = "";
global->configdir = talloc_strdup(global, force_configdir);
}
// Return a platform specific path using a path type as defined in osdep/path.h.
// Keep in mind that the only way to free the return value is freeing talloc_ctx
// (or its children), as this function can return a statically allocated string.
static const char *mp_get_platform_path(void *talloc_ctx,
struct mpv_global *global,
const char *type)
{
assert(talloc_ctx);
if (global->configdir) {
for (int n = 0; n < MP_ARRAY_SIZE(config_dirs); n++) {
if (strcmp(config_dirs[n], type) == 0)
return (n == 0 && global->configdir[0]) ? global->configdir : NULL;
}
}
for (int n = 0; n < MP_ARRAY_SIZE(path_resolvers); n++) {
const char *path = path_resolvers[n](talloc_ctx, type);
if (path && path[0])
return path;
}
return NULL;
}
char *mp_find_user_config_file(void *talloc_ctx, struct mpv_global *global,
const char *filename)
{
void *tmp = talloc_new(NULL);
char *res = (char *)mp_get_platform_path(tmp, global, config_dirs[0]);
if (res)
res = mp_path_join(talloc_ctx, res, filename);
talloc_free(tmp);
MP_DBG(global, "config path: '%s' -> '%s'\n", filename, res ? res : "-");
return res;
}
static char **mp_find_all_config_files_limited(void *talloc_ctx,
struct mpv_global *global,
int max_files,
const char *filename)
{
char **ret = talloc_array(talloc_ctx, char*, 2); // 2 preallocated
int num_ret = 0;
for (int i = 0; i < MP_ARRAY_SIZE(config_dirs); i++) {
const char *dir = mp_get_platform_path(ret, global, config_dirs[i]);
bstr s = bstr0(filename);
while (dir && num_ret < max_files && s.len) {
bstr fn;
bstr_split_tok(s, "|", &fn, &s);
char *file = mp_path_join_bstr(ret, bstr0(dir), fn);
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if (mp_path_exists(file)) {
MP_DBG(global, "config path: '%.*s' -> '%s'\n",
BSTR_P(fn), file);
MP_TARRAY_APPEND(NULL, ret, num_ret, file);
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} else {
MP_DBG(global, "config path: '%.*s' -/-> '%s'\n",
BSTR_P(fn), file);
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}
}
}
MP_TARRAY_GROW(NULL, ret, num_ret);
ret[num_ret] = NULL;
for (int n = 0; n < num_ret / 2; n++)
MPSWAP(char*, ret[n], ret[num_ret - n - 1]);
return ret;
}
char **mp_find_all_config_files(void *talloc_ctx, struct mpv_global *global,
const char *filename)
{
return mp_find_all_config_files_limited(talloc_ctx, global, 64, filename);
}
char *mp_find_config_file(void *talloc_ctx, struct mpv_global *global,
const char *filename)
{
char **l = mp_find_all_config_files_limited(talloc_ctx, global, 1, filename);
char *r = l && l[0] ? talloc_steal(talloc_ctx, l[0]) : NULL;
talloc_free(l);
return r;
}
char *mp_get_user_path(void *talloc_ctx, struct mpv_global *global,
const char *path)
{
if (!path)
return NULL;
char *res = NULL;
bstr bpath = bstr0(path);
if (bstr_eatstart0(&bpath, "~")) {
// parse to "~" <prefix> "/" <rest>
bstr prefix, rest;
if (bstr_split_tok(bpath, "/", &prefix, &rest)) {
const char *rest0 = rest.start; // ok in this case
if (bstr_equals0(prefix, "~")) {
res = mp_find_config_file(talloc_ctx, global, rest0);
if (!res) {
void *tmp = talloc_new(NULL);
const char *p = mp_get_platform_path(tmp, global, "home");
res = mp_path_join_bstr(talloc_ctx, bstr0(p), rest);
talloc_free(tmp);
}
} else if (bstr_equals0(prefix, "")) {
char *home = getenv("HOME");
if (!home)
home = getenv("USERPROFILE");
res = mp_path_join_bstr(talloc_ctx, bstr0(home), rest);
} else if (bstr_eatstart0(&prefix, "~")) {
void *tmp = talloc_new(NULL);
char type[80];
snprintf(type, sizeof(type), "%.*s", BSTR_P(prefix));
const char *p = mp_get_platform_path(tmp, global, type);
res = mp_path_join_bstr(talloc_ctx, bstr0(p), rest);
talloc_free(tmp);
}
}
}
if (!res)
res = talloc_strdup(talloc_ctx, path);
MP_DBG(global, "user path: '%s' -> '%s'\n", path, res);
return res;
}
char *mp_basename(const char *path)
{
char *s;
#if HAVE_DOS_PATHS
s = strrchr(path, '\\');
if (s)
path = s + 1;
s = strrchr(path, ':');
if (s)
path = s + 1;
#endif
s = strrchr(path, '/');
return s ? s + 1 : (char *)path;
}
struct bstr mp_dirname(const char *path)
{
struct bstr ret = {
(uint8_t *)path, mp_basename(path) - path
};
if (ret.len == 0)
return bstr0(".");
return ret;
}
#if HAVE_DOS_PATHS
static const char mp_path_separators[] = "\\/";
#else
static const char mp_path_separators[] = "/";
#endif
// Mutates path and removes a trailing '/' (or '\' on Windows)
void mp_path_strip_trailing_separator(char *path)
{
size_t len = strlen(path);
if (len > 0 && strchr(mp_path_separators, path[len - 1]))
path[len - 1] = '\0';
}
char *mp_splitext(const char *path, bstr *root)
{
assert(path);
const char *split = strrchr(path, '.');
if (!split || !split[1] || strchr(split, '/'))
return NULL;
if (root)
*root = (bstr){(char *)path, split - path};
return (char *)split + 1;
}
bool mp_path_is_absolute(struct bstr path)
{
if (path.len && strchr(mp_path_separators, path.start[0]))
return true;
#if HAVE_DOS_PATHS
path: change win32 semantics for joining drive-relative paths win32 is a cursed abomination which has "drive letters" at the root of the filesystem namespace for no reason. This requires special handling beyond tolerating the idiotic "\" path separator. Even more cursed is the fact that a path starting with a drive letter can be a relative path. For example, "c:billsucks" is actually a relative path to the current working directory of the C drive. So for example if the current working directory is "c:/windowsphone", then "c:billsucks" would reference "c:/windowsphone/billsucks". You should realize that win32 is a ridiculous satanic trash fire by the point you realize that win32 has at least 26 current working directories, one for each drive letter. Anyway, the actual problem is that mpv's mp_path_join() function would return a relative path if an absolute relative path is joined with a drive-relative path. This should never happen; I bet it breaks a lot of assumptions (maybe even some security or safety relevant ones, but probably not). Since relative drive paths are such a fucked up shit idea, don't try to support them "properly", and just solve the problem at hand. The solution produces a path that should be invalid on win32. Joining two relative paths still behaves the same; this is probably OK (maybe). The change isn't very minimal due to me rewriting parts of it without strict need, but I don't care. Note that the Python os.path.join() function (after which the mpv function was apparently modeled) has the same problem.
2020-02-06 13:06:53 +00:00
// Note: "X:filename" is a path relative to the current working directory
// of drive X, and thus is not an absolute path. It needs to be
// followed by \ or /.
if (path.len >= 3 && path.start[1] == ':' &&
strchr(mp_path_separators, path.start[2]))
return true;
#endif
return false;
}
char *mp_path_join_bstr(void *talloc_ctx, struct bstr p1, struct bstr p2)
{
if (p1.len == 0)
return bstrdup0(talloc_ctx, p2);
if (p2.len == 0)
return bstrdup0(talloc_ctx, p1);
if (mp_path_is_absolute(p2))
path: change win32 semantics for joining drive-relative paths win32 is a cursed abomination which has "drive letters" at the root of the filesystem namespace for no reason. This requires special handling beyond tolerating the idiotic "\" path separator. Even more cursed is the fact that a path starting with a drive letter can be a relative path. For example, "c:billsucks" is actually a relative path to the current working directory of the C drive. So for example if the current working directory is "c:/windowsphone", then "c:billsucks" would reference "c:/windowsphone/billsucks". You should realize that win32 is a ridiculous satanic trash fire by the point you realize that win32 has at least 26 current working directories, one for each drive letter. Anyway, the actual problem is that mpv's mp_path_join() function would return a relative path if an absolute relative path is joined with a drive-relative path. This should never happen; I bet it breaks a lot of assumptions (maybe even some security or safety relevant ones, but probably not). Since relative drive paths are such a fucked up shit idea, don't try to support them "properly", and just solve the problem at hand. The solution produces a path that should be invalid on win32. Joining two relative paths still behaves the same; this is probably OK (maybe). The change isn't very minimal due to me rewriting parts of it without strict need, but I don't care. Note that the Python os.path.join() function (after which the mpv function was apparently modeled) has the same problem.
2020-02-06 13:06:53 +00:00
return bstrdup0(talloc_ctx, p2);
path: change win32 semantics for joining drive-relative paths win32 is a cursed abomination which has "drive letters" at the root of the filesystem namespace for no reason. This requires special handling beyond tolerating the idiotic "\" path separator. Even more cursed is the fact that a path starting with a drive letter can be a relative path. For example, "c:billsucks" is actually a relative path to the current working directory of the C drive. So for example if the current working directory is "c:/windowsphone", then "c:billsucks" would reference "c:/windowsphone/billsucks". You should realize that win32 is a ridiculous satanic trash fire by the point you realize that win32 has at least 26 current working directories, one for each drive letter. Anyway, the actual problem is that mpv's mp_path_join() function would return a relative path if an absolute relative path is joined with a drive-relative path. This should never happen; I bet it breaks a lot of assumptions (maybe even some security or safety relevant ones, but probably not). Since relative drive paths are such a fucked up shit idea, don't try to support them "properly", and just solve the problem at hand. The solution produces a path that should be invalid on win32. Joining two relative paths still behaves the same; this is probably OK (maybe). The change isn't very minimal due to me rewriting parts of it without strict need, but I don't care. Note that the Python os.path.join() function (after which the mpv function was apparently modeled) has the same problem.
2020-02-06 13:06:53 +00:00
bool have_separator = strchr(mp_path_separators, p1.start[p1.len - 1]);
#if HAVE_DOS_PATHS
path: change win32 semantics for joining drive-relative paths win32 is a cursed abomination which has "drive letters" at the root of the filesystem namespace for no reason. This requires special handling beyond tolerating the idiotic "\" path separator. Even more cursed is the fact that a path starting with a drive letter can be a relative path. For example, "c:billsucks" is actually a relative path to the current working directory of the C drive. So for example if the current working directory is "c:/windowsphone", then "c:billsucks" would reference "c:/windowsphone/billsucks". You should realize that win32 is a ridiculous satanic trash fire by the point you realize that win32 has at least 26 current working directories, one for each drive letter. Anyway, the actual problem is that mpv's mp_path_join() function would return a relative path if an absolute relative path is joined with a drive-relative path. This should never happen; I bet it breaks a lot of assumptions (maybe even some security or safety relevant ones, but probably not). Since relative drive paths are such a fucked up shit idea, don't try to support them "properly", and just solve the problem at hand. The solution produces a path that should be invalid on win32. Joining two relative paths still behaves the same; this is probably OK (maybe). The change isn't very minimal due to me rewriting parts of it without strict need, but I don't care. Note that the Python os.path.join() function (after which the mpv function was apparently modeled) has the same problem.
2020-02-06 13:06:53 +00:00
// "X:" only => path relative to "X:" current working directory.
if (p1.len == 2 && p1.start[1] == ':')
have_separator = true;
#endif
return talloc_asprintf(talloc_ctx, "%.*s%s%.*s", BSTR_P(p1),
have_separator ? "" : "/", BSTR_P(p2));
}
char *mp_path_join(void *talloc_ctx, const char *p1, const char *p2)
{
return mp_path_join_bstr(talloc_ctx, bstr0(p1), bstr0(p2));
}
char *mp_getcwd(void *talloc_ctx)
{
char *e_wd = getenv("PWD");
if (e_wd)
return talloc_strdup(talloc_ctx, e_wd);
char *wd = talloc_array(talloc_ctx, char, 20);
while (getcwd(wd, talloc_get_size(wd)) == NULL) {
if (errno != ERANGE) {
talloc_free(wd);
return NULL;
}
wd = talloc_realloc(talloc_ctx, wd, char, talloc_get_size(wd) * 2);
}
return wd;
}
bool mp_path_exists(const char *path)
{
struct stat st;
return path && stat(path, &st) == 0;
}
bool mp_path_isdir(const char *path)
{
struct stat st;
return stat(path, &st) == 0 && S_ISDIR(st.st_mode);
}
// Return false if it's considered a normal local filesystem path.
bool mp_is_url(bstr path)
{
int proto = bstr_find0(path, "://");
if (proto < 1)
return false;
// Per RFC3986, the first character of the protocol must be alphabetic.
// The rest must be alphanumeric plus -, + and .
for (int i = 0; i < proto; i++) {
unsigned char c = path.start[i];
if ((i == 0 && !mp_isalpha(c)) ||
(!mp_isalnum(c) && c != '.' && c != '-' && c != '+'))
{
return false;
}
}
return true;
}
// Return the protocol part of path, e.g. "http" if path is "http://...".
// On success, out_url (if not NULL) is set to the part after the "://".
bstr mp_split_proto(bstr path, bstr *out_url)
{
if (!mp_is_url(path))
return (bstr){0};
bstr r;
bstr_split_tok(path, "://", &r, out_url ? out_url : &(bstr){0});
return r;
}
void mp_mkdirp(const char *dir)
{
char *path = talloc_strdup(NULL, dir);
char *cdir = path + 1;
while (cdir) {
cdir = strchr(cdir, '/');
if (cdir)
*cdir = 0;
mkdir(path, 0700);
if (cdir)
*cdir++ = '/';
}
talloc_free(path);
}
void mp_mk_config_dir(struct mpv_global *global, char *subdir)
{
char *dir = mp_find_user_config_file(NULL, global, subdir);
if (dir)
mp_mkdirp(dir);
talloc_free(dir);
}