3e1db806b0
Discussed in #13743, the -.service semantic conflicts with the existing root mount and slice names, making this feature not uniformly extensible to all types. Change the name to be <type>.d instead. Updating to this format also extends the top-level dropin to unit types.
774 lines
19 KiB
C
774 lines
19 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
|
|
|
|
#include <errno.h>
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "alloc-util.h"
|
|
#include "glob-util.h"
|
|
#include "hexdecoct.h"
|
|
#include "path-util.h"
|
|
#include "special.h"
|
|
#include "string-util.h"
|
|
#include "strv.h"
|
|
#include "unit-name.h"
|
|
|
|
/* Characters valid in a unit name. */
|
|
#define VALID_CHARS \
|
|
DIGITS \
|
|
LETTERS \
|
|
":-_.\\"
|
|
|
|
/* The same, but also permits the single @ character that may appear */
|
|
#define VALID_CHARS_WITH_AT \
|
|
"@" \
|
|
VALID_CHARS
|
|
|
|
/* All chars valid in a unit name glob */
|
|
#define VALID_CHARS_GLOB \
|
|
VALID_CHARS_WITH_AT \
|
|
"[]!-*?"
|
|
|
|
bool unit_name_is_valid(const char *n, UnitNameFlags flags) {
|
|
const char *e, *i, *at;
|
|
|
|
assert((flags & ~(UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE)) == 0);
|
|
|
|
if (_unlikely_(flags == 0))
|
|
return false;
|
|
|
|
if (isempty(n))
|
|
return false;
|
|
|
|
if (strlen(n) >= UNIT_NAME_MAX)
|
|
return false;
|
|
|
|
e = strrchr(n, '.');
|
|
if (!e || e == n)
|
|
return false;
|
|
|
|
if (unit_type_from_string(e + 1) < 0)
|
|
return false;
|
|
|
|
for (i = n, at = NULL; i < e; i++) {
|
|
|
|
if (*i == '@' && !at)
|
|
at = i;
|
|
|
|
if (!strchr("@" VALID_CHARS, *i))
|
|
return false;
|
|
}
|
|
|
|
if (at == n)
|
|
return false;
|
|
|
|
if (flags & UNIT_NAME_PLAIN)
|
|
if (!at)
|
|
return true;
|
|
|
|
if (flags & UNIT_NAME_INSTANCE)
|
|
if (at && e > at + 1)
|
|
return true;
|
|
|
|
if (flags & UNIT_NAME_TEMPLATE)
|
|
if (at && e == at + 1)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
bool unit_prefix_is_valid(const char *p) {
|
|
|
|
/* We don't allow additional @ in the prefix string */
|
|
|
|
if (isempty(p))
|
|
return false;
|
|
|
|
return in_charset(p, VALID_CHARS);
|
|
}
|
|
|
|
bool unit_instance_is_valid(const char *i) {
|
|
|
|
/* The max length depends on the length of the string, so we
|
|
* don't really check this here. */
|
|
|
|
if (isempty(i))
|
|
return false;
|
|
|
|
/* We allow additional @ in the instance string, we do not
|
|
* allow them in the prefix! */
|
|
|
|
return in_charset(i, "@" VALID_CHARS);
|
|
}
|
|
|
|
bool unit_suffix_is_valid(const char *s) {
|
|
if (isempty(s))
|
|
return false;
|
|
|
|
if (s[0] != '.')
|
|
return false;
|
|
|
|
if (unit_type_from_string(s + 1) < 0)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
int unit_name_to_prefix(const char *n, char **ret) {
|
|
const char *p;
|
|
char *s;
|
|
|
|
assert(n);
|
|
assert(ret);
|
|
|
|
if (!unit_name_is_valid(n, UNIT_NAME_ANY))
|
|
return -EINVAL;
|
|
|
|
p = strchr(n, '@');
|
|
if (!p)
|
|
p = strrchr(n, '.');
|
|
|
|
assert_se(p);
|
|
|
|
s = strndup(n, p - n);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
*ret = s;
|
|
return 0;
|
|
}
|
|
|
|
int unit_name_to_instance(const char *n, char **ret) {
|
|
const char *p, *d;
|
|
|
|
assert(n);
|
|
|
|
if (!unit_name_is_valid(n, UNIT_NAME_ANY))
|
|
return -EINVAL;
|
|
|
|
/* Everything past the first @ and before the last . is the instance */
|
|
p = strchr(n, '@');
|
|
if (!p) {
|
|
if (ret)
|
|
*ret = NULL;
|
|
return UNIT_NAME_PLAIN;
|
|
}
|
|
|
|
p++;
|
|
|
|
d = strrchr(p, '.');
|
|
if (!d)
|
|
return -EINVAL;
|
|
|
|
if (ret) {
|
|
char *i = strndup(p, d-p);
|
|
if (!i)
|
|
return -ENOMEM;
|
|
|
|
*ret = i;
|
|
}
|
|
return d > p ? UNIT_NAME_INSTANCE : UNIT_NAME_TEMPLATE;
|
|
}
|
|
|
|
int unit_name_to_prefix_and_instance(const char *n, char **ret) {
|
|
const char *d;
|
|
char *s;
|
|
|
|
assert(n);
|
|
assert(ret);
|
|
|
|
if (!unit_name_is_valid(n, UNIT_NAME_ANY))
|
|
return -EINVAL;
|
|
|
|
d = strrchr(n, '.');
|
|
if (!d)
|
|
return -EINVAL;
|
|
|
|
s = strndup(n, d - n);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
*ret = s;
|
|
return 0;
|
|
}
|
|
|
|
UnitType unit_name_to_type(const char *n) {
|
|
const char *e;
|
|
|
|
assert(n);
|
|
|
|
if (!unit_name_is_valid(n, UNIT_NAME_ANY))
|
|
return _UNIT_TYPE_INVALID;
|
|
|
|
assert_se(e = strrchr(n, '.'));
|
|
|
|
return unit_type_from_string(e + 1);
|
|
}
|
|
|
|
int unit_name_change_suffix(const char *n, const char *suffix, char **ret) {
|
|
char *e, *s;
|
|
size_t a, b;
|
|
|
|
assert(n);
|
|
assert(suffix);
|
|
assert(ret);
|
|
|
|
if (!unit_name_is_valid(n, UNIT_NAME_ANY))
|
|
return -EINVAL;
|
|
|
|
if (!unit_suffix_is_valid(suffix))
|
|
return -EINVAL;
|
|
|
|
assert_se(e = strrchr(n, '.'));
|
|
|
|
a = e - n;
|
|
b = strlen(suffix);
|
|
|
|
s = new(char, a + b + 1);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
strcpy(mempcpy(s, n, a), suffix);
|
|
*ret = s;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int unit_name_build(const char *prefix, const char *instance, const char *suffix, char **ret) {
|
|
UnitType type;
|
|
|
|
assert(prefix);
|
|
assert(suffix);
|
|
assert(ret);
|
|
|
|
if (suffix[0] != '.')
|
|
return -EINVAL;
|
|
|
|
type = unit_type_from_string(suffix + 1);
|
|
if (type < 0)
|
|
return -EINVAL;
|
|
|
|
return unit_name_build_from_type(prefix, instance, type, ret);
|
|
}
|
|
|
|
int unit_name_build_from_type(const char *prefix, const char *instance, UnitType type, char **ret) {
|
|
const char *ut;
|
|
char *s;
|
|
|
|
assert(prefix);
|
|
assert(type >= 0);
|
|
assert(type < _UNIT_TYPE_MAX);
|
|
assert(ret);
|
|
|
|
if (!unit_prefix_is_valid(prefix))
|
|
return -EINVAL;
|
|
|
|
if (instance && !unit_instance_is_valid(instance))
|
|
return -EINVAL;
|
|
|
|
ut = unit_type_to_string(type);
|
|
|
|
if (!instance)
|
|
s = strjoin(prefix, ".", ut);
|
|
else
|
|
s = strjoin(prefix, "@", instance, ".", ut);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
*ret = s;
|
|
return 0;
|
|
}
|
|
|
|
static char *do_escape_char(char c, char *t) {
|
|
assert(t);
|
|
|
|
*(t++) = '\\';
|
|
*(t++) = 'x';
|
|
*(t++) = hexchar(c >> 4);
|
|
*(t++) = hexchar(c);
|
|
|
|
return t;
|
|
}
|
|
|
|
static char *do_escape(const char *f, char *t) {
|
|
assert(f);
|
|
assert(t);
|
|
|
|
/* do not create units with a leading '.', like for "/.dotdir" mount points */
|
|
if (*f == '.') {
|
|
t = do_escape_char(*f, t);
|
|
f++;
|
|
}
|
|
|
|
for (; *f; f++) {
|
|
if (*f == '/')
|
|
*(t++) = '-';
|
|
else if (IN_SET(*f, '-', '\\') || !strchr(VALID_CHARS, *f))
|
|
t = do_escape_char(*f, t);
|
|
else
|
|
*(t++) = *f;
|
|
}
|
|
|
|
return t;
|
|
}
|
|
|
|
char *unit_name_escape(const char *f) {
|
|
char *r, *t;
|
|
|
|
assert(f);
|
|
|
|
r = new(char, strlen(f)*4+1);
|
|
if (!r)
|
|
return NULL;
|
|
|
|
t = do_escape(f, r);
|
|
*t = 0;
|
|
|
|
return r;
|
|
}
|
|
|
|
int unit_name_unescape(const char *f, char **ret) {
|
|
_cleanup_free_ char *r = NULL;
|
|
char *t;
|
|
|
|
assert(f);
|
|
|
|
r = strdup(f);
|
|
if (!r)
|
|
return -ENOMEM;
|
|
|
|
for (t = r; *f; f++) {
|
|
if (*f == '-')
|
|
*(t++) = '/';
|
|
else if (*f == '\\') {
|
|
int a, b;
|
|
|
|
if (f[1] != 'x')
|
|
return -EINVAL;
|
|
|
|
a = unhexchar(f[2]);
|
|
if (a < 0)
|
|
return -EINVAL;
|
|
|
|
b = unhexchar(f[3]);
|
|
if (b < 0)
|
|
return -EINVAL;
|
|
|
|
*(t++) = (char) (((uint8_t) a << 4U) | (uint8_t) b);
|
|
f += 3;
|
|
} else
|
|
*(t++) = *f;
|
|
}
|
|
|
|
*t = 0;
|
|
|
|
*ret = TAKE_PTR(r);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int unit_name_path_escape(const char *f, char **ret) {
|
|
char *p, *s;
|
|
|
|
assert(f);
|
|
assert(ret);
|
|
|
|
p = strdupa(f);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
path_simplify(p, false);
|
|
|
|
if (empty_or_root(p))
|
|
s = strdup("-");
|
|
else {
|
|
if (!path_is_normalized(p))
|
|
return -EINVAL;
|
|
|
|
/* Truncate trailing slashes */
|
|
delete_trailing_chars(p, "/");
|
|
|
|
/* Truncate leading slashes */
|
|
p = skip_leading_chars(p, "/");
|
|
|
|
s = unit_name_escape(p);
|
|
}
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
*ret = s;
|
|
return 0;
|
|
}
|
|
|
|
int unit_name_path_unescape(const char *f, char **ret) {
|
|
_cleanup_free_ char *s = NULL;
|
|
int r;
|
|
|
|
assert(f);
|
|
|
|
if (isempty(f))
|
|
return -EINVAL;
|
|
|
|
if (streq(f, "-")) {
|
|
s = strdup("/");
|
|
if (!s)
|
|
return -ENOMEM;
|
|
} else {
|
|
_cleanup_free_ char *w = NULL;
|
|
|
|
r = unit_name_unescape(f, &w);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Don't accept trailing or leading slashes */
|
|
if (startswith(w, "/") || endswith(w, "/"))
|
|
return -EINVAL;
|
|
|
|
/* Prefix a slash again */
|
|
s = strjoin("/", w);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
if (!path_is_normalized(s))
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ret)
|
|
*ret = TAKE_PTR(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int unit_name_replace_instance(const char *f, const char *i, char **ret) {
|
|
const char *p, *e;
|
|
char *s;
|
|
size_t a, b;
|
|
|
|
assert(f);
|
|
assert(i);
|
|
assert(ret);
|
|
|
|
if (!unit_name_is_valid(f, UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE))
|
|
return -EINVAL;
|
|
if (!unit_instance_is_valid(i))
|
|
return -EINVAL;
|
|
|
|
assert_se(p = strchr(f, '@'));
|
|
assert_se(e = strrchr(f, '.'));
|
|
|
|
a = p - f;
|
|
b = strlen(i);
|
|
|
|
s = new(char, a + 1 + b + strlen(e) + 1);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
strcpy(mempcpy(mempcpy(s, f, a + 1), i, b), e);
|
|
|
|
*ret = s;
|
|
return 0;
|
|
}
|
|
|
|
int unit_name_template(const char *f, char **ret) {
|
|
const char *p, *e;
|
|
char *s;
|
|
size_t a;
|
|
|
|
assert(f);
|
|
assert(ret);
|
|
|
|
if (!unit_name_is_valid(f, UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE))
|
|
return -EINVAL;
|
|
|
|
assert_se(p = strchr(f, '@'));
|
|
assert_se(e = strrchr(f, '.'));
|
|
|
|
a = p - f;
|
|
|
|
s = new(char, a + 1 + strlen(e) + 1);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
strcpy(mempcpy(s, f, a + 1), e);
|
|
|
|
*ret = s;
|
|
return 0;
|
|
}
|
|
|
|
int unit_name_from_path(const char *path, const char *suffix, char **ret) {
|
|
_cleanup_free_ char *p = NULL;
|
|
char *s = NULL;
|
|
int r;
|
|
|
|
assert(path);
|
|
assert(suffix);
|
|
assert(ret);
|
|
|
|
if (!unit_suffix_is_valid(suffix))
|
|
return -EINVAL;
|
|
|
|
r = unit_name_path_escape(path, &p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
s = strjoin(p, suffix);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
*ret = s;
|
|
return 0;
|
|
}
|
|
|
|
int unit_name_from_path_instance(const char *prefix, const char *path, const char *suffix, char **ret) {
|
|
_cleanup_free_ char *p = NULL;
|
|
char *s;
|
|
int r;
|
|
|
|
assert(prefix);
|
|
assert(path);
|
|
assert(suffix);
|
|
assert(ret);
|
|
|
|
if (!unit_prefix_is_valid(prefix))
|
|
return -EINVAL;
|
|
|
|
if (!unit_suffix_is_valid(suffix))
|
|
return -EINVAL;
|
|
|
|
r = unit_name_path_escape(path, &p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
s = strjoin(prefix, "@", p, suffix);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
*ret = s;
|
|
return 0;
|
|
}
|
|
|
|
int unit_name_to_path(const char *name, char **ret) {
|
|
_cleanup_free_ char *prefix = NULL;
|
|
int r;
|
|
|
|
assert(name);
|
|
|
|
r = unit_name_to_prefix(name, &prefix);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return unit_name_path_unescape(prefix, ret);
|
|
}
|
|
|
|
static bool do_escape_mangle(const char *f, bool allow_globs, char *t) {
|
|
const char *valid_chars;
|
|
bool mangled = false;
|
|
|
|
assert(f);
|
|
assert(t);
|
|
|
|
/* We'll only escape the obvious characters here, to play safe.
|
|
*
|
|
* Returns true if any characters were mangled, false otherwise.
|
|
*/
|
|
|
|
valid_chars = allow_globs ? VALID_CHARS_GLOB : VALID_CHARS_WITH_AT;
|
|
|
|
for (; *f; f++)
|
|
if (*f == '/') {
|
|
*(t++) = '-';
|
|
mangled = true;
|
|
} else if (!strchr(valid_chars, *f)) {
|
|
t = do_escape_char(*f, t);
|
|
mangled = true;
|
|
} else
|
|
*(t++) = *f;
|
|
*t = 0;
|
|
|
|
return mangled;
|
|
}
|
|
|
|
/**
|
|
* Convert a string to a unit name. /dev/blah is converted to dev-blah.device,
|
|
* /blah/blah is converted to blah-blah.mount, anything else is left alone,
|
|
* except that @suffix is appended if a valid unit suffix is not present.
|
|
*
|
|
* If @allow_globs, globs characters are preserved. Otherwise, they are escaped.
|
|
*/
|
|
int unit_name_mangle_with_suffix(const char *name, const char *operation, UnitNameMangle flags, const char *suffix, char **ret) {
|
|
char *s;
|
|
int r;
|
|
bool mangled, suggest_escape = true;
|
|
|
|
assert(name);
|
|
assert(suffix);
|
|
assert(ret);
|
|
|
|
if (isempty(name)) /* We cannot mangle empty unit names to become valid, sorry. */
|
|
return -EINVAL;
|
|
|
|
if (!unit_suffix_is_valid(suffix))
|
|
return -EINVAL;
|
|
|
|
/* Already a fully valid unit name? If so, no mangling is necessary... */
|
|
if (unit_name_is_valid(name, UNIT_NAME_ANY))
|
|
goto good;
|
|
|
|
/* Already a fully valid globbing expression? If so, no mangling is necessary either... */
|
|
if (string_is_glob(name) && in_charset(name, VALID_CHARS_GLOB)) {
|
|
if (flags & UNIT_NAME_MANGLE_GLOB)
|
|
goto good;
|
|
log_full(flags & UNIT_NAME_MANGLE_WARN ? LOG_NOTICE : LOG_DEBUG,
|
|
"Glob pattern passed%s%s, but globs are not supported for this.",
|
|
operation ? " " : "", operation ?: "");
|
|
suggest_escape = false;
|
|
}
|
|
|
|
if (is_device_path(name)) {
|
|
r = unit_name_from_path(name, ".device", ret);
|
|
if (r >= 0)
|
|
return 1;
|
|
if (r != -EINVAL)
|
|
return r;
|
|
}
|
|
|
|
if (path_is_absolute(name)) {
|
|
r = unit_name_from_path(name, ".mount", ret);
|
|
if (r >= 0)
|
|
return 1;
|
|
if (r != -EINVAL)
|
|
return r;
|
|
}
|
|
|
|
s = new(char, strlen(name) * 4 + strlen(suffix) + 1);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
mangled = do_escape_mangle(name, flags & UNIT_NAME_MANGLE_GLOB, s);
|
|
if (mangled)
|
|
log_full(flags & UNIT_NAME_MANGLE_WARN ? LOG_NOTICE : LOG_DEBUG,
|
|
"Invalid unit name \"%s\" escaped as \"%s\"%s.",
|
|
name, s,
|
|
suggest_escape ? " (maybe you should use systemd-escape?)" : "");
|
|
|
|
/* Append a suffix if it doesn't have any, but only if this is not a glob, so that we can allow
|
|
* "foo.*" as a valid glob. */
|
|
if ((!(flags & UNIT_NAME_MANGLE_GLOB) || !string_is_glob(s)) && unit_name_to_type(s) < 0)
|
|
strcat(s, suffix);
|
|
|
|
*ret = s;
|
|
return 1;
|
|
|
|
good:
|
|
s = strdup(name);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
*ret = s;
|
|
return 0;
|
|
}
|
|
|
|
int slice_build_parent_slice(const char *slice, char **ret) {
|
|
char *s, *dash;
|
|
int r;
|
|
|
|
assert(slice);
|
|
assert(ret);
|
|
|
|
if (!slice_name_is_valid(slice))
|
|
return -EINVAL;
|
|
|
|
if (streq(slice, SPECIAL_ROOT_SLICE)) {
|
|
*ret = NULL;
|
|
return 0;
|
|
}
|
|
|
|
s = strdup(slice);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
dash = strrchr(s, '-');
|
|
if (dash)
|
|
strcpy(dash, ".slice");
|
|
else {
|
|
r = free_and_strdup(&s, SPECIAL_ROOT_SLICE);
|
|
if (r < 0) {
|
|
free(s);
|
|
return r;
|
|
}
|
|
}
|
|
|
|
*ret = s;
|
|
return 1;
|
|
}
|
|
|
|
int slice_build_subslice(const char *slice, const char *name, char **ret) {
|
|
char *subslice;
|
|
|
|
assert(slice);
|
|
assert(name);
|
|
assert(ret);
|
|
|
|
if (!slice_name_is_valid(slice))
|
|
return -EINVAL;
|
|
|
|
if (!unit_prefix_is_valid(name))
|
|
return -EINVAL;
|
|
|
|
if (streq(slice, SPECIAL_ROOT_SLICE))
|
|
subslice = strjoin(name, ".slice");
|
|
else {
|
|
char *e;
|
|
|
|
assert_se(e = endswith(slice, ".slice"));
|
|
|
|
subslice = new(char, (e - slice) + 1 + strlen(name) + 6 + 1);
|
|
if (!subslice)
|
|
return -ENOMEM;
|
|
|
|
stpcpy(stpcpy(stpcpy(mempcpy(subslice, slice, e - slice), "-"), name), ".slice");
|
|
}
|
|
|
|
*ret = subslice;
|
|
return 0;
|
|
}
|
|
|
|
bool slice_name_is_valid(const char *name) {
|
|
const char *p, *e;
|
|
bool dash = false;
|
|
|
|
if (!unit_name_is_valid(name, UNIT_NAME_PLAIN))
|
|
return false;
|
|
|
|
if (streq(name, SPECIAL_ROOT_SLICE))
|
|
return true;
|
|
|
|
e = endswith(name, ".slice");
|
|
if (!e)
|
|
return false;
|
|
|
|
for (p = name; p < e; p++) {
|
|
|
|
if (*p == '-') {
|
|
|
|
/* Don't allow initial dash */
|
|
if (p == name)
|
|
return false;
|
|
|
|
/* Don't allow multiple dashes */
|
|
if (dash)
|
|
return false;
|
|
|
|
dash = true;
|
|
} else
|
|
dash = false;
|
|
}
|
|
|
|
/* Don't allow trailing hash */
|
|
if (dash)
|
|
return false;
|
|
|
|
return true;
|
|
}
|