mirror of
https://github.com/systemd/systemd.git
synced 2024-11-13 23:21:08 +03:00
a095315b3c
basic/ can be used by everything cannot use anything outside of basic/ libsystemd/ can use basic/ cannot use shared/ shared/ can use libsystemd/
835 lines
20 KiB
C
835 lines
20 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <string.h>
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#include "path-util.h"
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#include "bus-label.h"
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#include "util.h"
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#include "unit-name.h"
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#include "def.h"
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#include "strv.h"
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#define VALID_CHARS \
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DIGITS LETTERS \
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":-_.\\"
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bool unit_name_is_valid(const char *n, UnitNameFlags flags) {
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const char *e, *i, *at;
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assert((flags & ~(UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE)) == 0);
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if (_unlikely_(flags == 0))
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return false;
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if (isempty(n))
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return false;
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if (strlen(n) >= UNIT_NAME_MAX)
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return false;
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e = strrchr(n, '.');
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if (!e || e == n)
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return false;
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if (unit_type_from_string(e + 1) < 0)
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return false;
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for (i = n, at = NULL; i < e; i++) {
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if (*i == '@' && !at)
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at = i;
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if (!strchr("@" VALID_CHARS, *i))
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return false;
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}
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if (at == n)
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return false;
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if (flags & UNIT_NAME_PLAIN)
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if (!at)
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return true;
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if (flags & UNIT_NAME_INSTANCE)
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if (at && e > at + 1)
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return true;
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if (flags & UNIT_NAME_TEMPLATE)
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if (at && e == at + 1)
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return true;
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return false;
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}
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bool unit_prefix_is_valid(const char *p) {
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/* We don't allow additional @ in the prefix string */
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if (isempty(p))
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return false;
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return in_charset(p, VALID_CHARS);
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}
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bool unit_instance_is_valid(const char *i) {
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/* The max length depends on the length of the string, so we
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* don't really check this here. */
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if (isempty(i))
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return false;
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/* We allow additional @ in the instance string, we do not
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* allow them in the prefix! */
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return in_charset(i, "@" VALID_CHARS);
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}
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bool unit_suffix_is_valid(const char *s) {
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if (isempty(s))
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return false;
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if (s[0] != '.')
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return false;
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if (unit_type_from_string(s + 1) < 0)
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return false;
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return true;
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}
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int unit_name_to_prefix(const char *n, char **ret) {
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const char *p;
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char *s;
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assert(n);
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assert(ret);
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if (!unit_name_is_valid(n, UNIT_NAME_ANY))
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return -EINVAL;
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p = strchr(n, '@');
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if (!p)
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p = strrchr(n, '.');
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assert_se(p);
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s = strndup(n, p - n);
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if (!s)
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return -ENOMEM;
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*ret = s;
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return 0;
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}
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int unit_name_to_instance(const char *n, char **instance) {
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const char *p, *d;
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char *i;
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assert(n);
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assert(instance);
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if (!unit_name_is_valid(n, UNIT_NAME_ANY))
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return -EINVAL;
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/* Everything past the first @ and before the last . is the instance */
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p = strchr(n, '@');
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if (!p) {
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*instance = NULL;
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return 0;
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}
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p++;
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d = strrchr(p, '.');
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if (!d)
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return -EINVAL;
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i = strndup(p, d-p);
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if (!i)
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return -ENOMEM;
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*instance = i;
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return 1;
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}
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int unit_name_to_prefix_and_instance(const char *n, char **ret) {
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const char *d;
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char *s;
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assert(n);
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assert(ret);
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if (!unit_name_is_valid(n, UNIT_NAME_ANY))
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return -EINVAL;
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d = strrchr(n, '.');
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if (!d)
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return -EINVAL;
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s = strndup(n, d - n);
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if (!s)
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return -ENOMEM;
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*ret = s;
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return 0;
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}
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UnitType unit_name_to_type(const char *n) {
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const char *e;
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assert(n);
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if (!unit_name_is_valid(n, UNIT_NAME_ANY))
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return _UNIT_TYPE_INVALID;
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assert_se(e = strrchr(n, '.'));
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return unit_type_from_string(e + 1);
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}
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int unit_name_change_suffix(const char *n, const char *suffix, char **ret) {
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char *e, *s;
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size_t a, b;
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assert(n);
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assert(suffix);
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assert(ret);
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if (!unit_name_is_valid(n, UNIT_NAME_ANY))
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return -EINVAL;
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if (!unit_suffix_is_valid(suffix))
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return -EINVAL;
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assert_se(e = strrchr(n, '.'));
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a = e - n;
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b = strlen(suffix);
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s = new(char, a + b + 1);
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if (!s)
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return -ENOMEM;
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strcpy(mempcpy(s, n, a), suffix);
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*ret = s;
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return 0;
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}
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int unit_name_build(const char *prefix, const char *instance, const char *suffix, char **ret) {
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char *s;
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assert(prefix);
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assert(suffix);
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assert(ret);
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if (!unit_prefix_is_valid(prefix))
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return -EINVAL;
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if (instance && !unit_instance_is_valid(instance))
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return -EINVAL;
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if (!unit_suffix_is_valid(suffix))
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return -EINVAL;
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if (!instance)
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s = strappend(prefix, suffix);
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else
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s = strjoin(prefix, "@", instance, suffix, NULL);
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if (!s)
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return -ENOMEM;
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*ret = s;
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return 0;
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}
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static char *do_escape_char(char c, char *t) {
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assert(t);
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*(t++) = '\\';
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*(t++) = 'x';
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*(t++) = hexchar(c >> 4);
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*(t++) = hexchar(c);
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return t;
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}
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static char *do_escape(const char *f, char *t) {
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assert(f);
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assert(t);
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/* do not create units with a leading '.', like for "/.dotdir" mount points */
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if (*f == '.') {
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t = do_escape_char(*f, t);
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f++;
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}
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for (; *f; f++) {
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if (*f == '/')
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*(t++) = '-';
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else if (*f == '-' || *f == '\\' || !strchr(VALID_CHARS, *f))
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t = do_escape_char(*f, t);
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else
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*(t++) = *f;
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}
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return t;
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}
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char *unit_name_escape(const char *f) {
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char *r, *t;
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assert(f);
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r = new(char, strlen(f)*4+1);
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if (!r)
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return NULL;
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t = do_escape(f, r);
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*t = 0;
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return r;
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}
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int unit_name_unescape(const char *f, char **ret) {
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_cleanup_free_ char *r = NULL;
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char *t;
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assert(f);
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r = strdup(f);
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if (!r)
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return -ENOMEM;
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for (t = r; *f; f++) {
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if (*f == '-')
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*(t++) = '/';
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else if (*f == '\\') {
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int a, b;
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if (f[1] != 'x')
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return -EINVAL;
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a = unhexchar(f[2]);
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if (a < 0)
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return -EINVAL;
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b = unhexchar(f[3]);
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if (b < 0)
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return -EINVAL;
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*(t++) = (char) (((uint8_t) a << 4U) | (uint8_t) b);
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f += 3;
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} else
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*(t++) = *f;
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}
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*t = 0;
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*ret = r;
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r = NULL;
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return 0;
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}
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int unit_name_path_escape(const char *f, char **ret) {
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char *p, *s;
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assert(f);
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assert(ret);
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p = strdupa(f);
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if (!p)
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return -ENOMEM;
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path_kill_slashes(p);
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if (STR_IN_SET(p, "/", ""))
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s = strdup("-");
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else {
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char *e;
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if (!path_is_safe(p))
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return -EINVAL;
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/* Truncate trailing slashes */
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e = endswith(p, "/");
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if (e)
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*e = 0;
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/* Truncate leading slashes */
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if (p[0] == '/')
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p++;
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s = unit_name_escape(p);
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}
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if (!s)
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return -ENOMEM;
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*ret = s;
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return 0;
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}
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int unit_name_path_unescape(const char *f, char **ret) {
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char *s;
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int r;
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assert(f);
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if (isempty(f))
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return -EINVAL;
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if (streq(f, "-")) {
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s = strdup("/");
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if (!s)
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return -ENOMEM;
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} else {
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char *w;
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r = unit_name_unescape(f, &w);
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if (r < 0)
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return r;
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/* Don't accept trailing or leading slashes */
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if (startswith(w, "/") || endswith(w, "/")) {
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free(w);
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return -EINVAL;
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}
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/* Prefix a slash again */
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s = strappend("/", w);
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free(w);
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if (!s)
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return -ENOMEM;
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if (!path_is_safe(s)) {
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free(s);
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return -EINVAL;
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}
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}
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if (ret)
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*ret = s;
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else
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free(s);
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return 0;
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}
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int unit_name_replace_instance(const char *f, const char *i, char **ret) {
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const char *p, *e;
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char *s;
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size_t a, b;
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assert(f);
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assert(i);
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assert(ret);
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if (!unit_name_is_valid(f, UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE))
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return -EINVAL;
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if (!unit_instance_is_valid(i))
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return -EINVAL;
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assert_se(p = strchr(f, '@'));
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assert_se(e = strrchr(f, '.'));
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a = p - f;
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b = strlen(i);
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s = new(char, a + 1 + b + strlen(e) + 1);
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if (!s)
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return -ENOMEM;
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strcpy(mempcpy(mempcpy(s, f, a + 1), i, b), e);
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*ret = s;
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return 0;
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}
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int unit_name_template(const char *f, char **ret) {
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const char *p, *e;
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char *s;
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size_t a;
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assert(f);
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assert(ret);
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if (!unit_name_is_valid(f, UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE))
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return -EINVAL;
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assert_se(p = strchr(f, '@'));
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assert_se(e = strrchr(f, '.'));
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a = p - f;
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s = new(char, a + 1 + strlen(e) + 1);
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if (!s)
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return -ENOMEM;
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strcpy(mempcpy(s, f, a + 1), e);
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*ret = s;
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return 0;
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}
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int unit_name_from_path(const char *path, const char *suffix, char **ret) {
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_cleanup_free_ char *p = NULL;
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char *s = NULL;
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int r;
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assert(path);
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assert(suffix);
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assert(ret);
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if (!unit_suffix_is_valid(suffix))
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return -EINVAL;
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r = unit_name_path_escape(path, &p);
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if (r < 0)
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return r;
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s = strappend(p, suffix);
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if (!s)
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return -ENOMEM;
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*ret = s;
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return 0;
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}
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int unit_name_from_path_instance(const char *prefix, const char *path, const char *suffix, char **ret) {
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_cleanup_free_ char *p = NULL;
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char *s;
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int r;
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assert(prefix);
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assert(path);
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assert(suffix);
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assert(ret);
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if (!unit_prefix_is_valid(prefix))
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return -EINVAL;
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if (!unit_suffix_is_valid(suffix))
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return -EINVAL;
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r = unit_name_path_escape(path, &p);
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if (r < 0)
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return r;
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s = strjoin(prefix, "@", p, suffix, NULL);
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if (!s)
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return -ENOMEM;
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*ret = s;
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return 0;
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}
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int unit_name_to_path(const char *name, char **ret) {
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_cleanup_free_ char *prefix = NULL;
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int r;
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assert(name);
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r = unit_name_to_prefix(name, &prefix);
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if (r < 0)
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return r;
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return unit_name_path_unescape(prefix, ret);
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}
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|
|
char *unit_dbus_path_from_name(const char *name) {
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_cleanup_free_ char *e = NULL;
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|
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assert(name);
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e = bus_label_escape(name);
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|
if (!e)
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return NULL;
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return strappend("/org/freedesktop/systemd1/unit/", e);
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|
}
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|
|
int unit_name_from_dbus_path(const char *path, char **name) {
|
|
const char *e;
|
|
char *n;
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|
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e = startswith(path, "/org/freedesktop/systemd1/unit/");
|
|
if (!e)
|
|
return -EINVAL;
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|
|
n = bus_label_unescape(e);
|
|
if (!n)
|
|
return -ENOMEM;
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|
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*name = n;
|
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return 0;
|
|
}
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|
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static char *do_escape_mangle(const char *f, UnitNameMangle allow_globs, char *t) {
|
|
const char *valid_chars;
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|
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assert(f);
|
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assert(IN_SET(allow_globs, UNIT_NAME_GLOB, UNIT_NAME_NOGLOB));
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|
assert(t);
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|
|
/* We'll only escape the obvious characters here, to play
|
|
* safe. */
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|
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valid_chars = allow_globs == UNIT_NAME_GLOB ? "@" VALID_CHARS "[]!-*?" : "@" VALID_CHARS;
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|
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for (; *f; f++) {
|
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if (*f == '/')
|
|
*(t++) = '-';
|
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else if (!strchr(valid_chars, *f))
|
|
t = do_escape_char(*f, t);
|
|
else
|
|
*(t++) = *f;
|
|
}
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|
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return t;
|
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}
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|
|
/**
|
|
* 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, UnitNameMangle allow_globs, const char *suffix, char **ret) {
|
|
char *s, *t;
|
|
int r;
|
|
|
|
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;
|
|
|
|
if (unit_name_is_valid(name, UNIT_NAME_ANY)) {
|
|
/* No mangling necessary... */
|
|
s = strdup(name);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
*ret = s;
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
|
|
t = do_escape_mangle(name, allow_globs, s);
|
|
*t = 0;
|
|
|
|
if (unit_name_to_type(s) < 0)
|
|
strcpy(t, suffix);
|
|
|
|
*ret = s;
|
|
return 1;
|
|
}
|
|
|
|
int slice_build_parent_slice(const char *slice, char **ret) {
|
|
char *s, *dash;
|
|
|
|
assert(slice);
|
|
assert(ret);
|
|
|
|
if (!slice_name_is_valid(slice))
|
|
return -EINVAL;
|
|
|
|
if (streq(slice, "-.slice")) {
|
|
*ret = NULL;
|
|
return 0;
|
|
}
|
|
|
|
s = strdup(slice);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
dash = strrchr(s, '-');
|
|
if (dash)
|
|
strcpy(dash, ".slice");
|
|
else {
|
|
free(s);
|
|
|
|
s = strdup("-.slice");
|
|
if (!s)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*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, "-.slice"))
|
|
subslice = strappend(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, "-.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;
|
|
}
|
|
|
|
static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
|
|
[UNIT_SERVICE] = "service",
|
|
[UNIT_SOCKET] = "socket",
|
|
[UNIT_BUSNAME] = "busname",
|
|
[UNIT_TARGET] = "target",
|
|
[UNIT_SNAPSHOT] = "snapshot",
|
|
[UNIT_DEVICE] = "device",
|
|
[UNIT_MOUNT] = "mount",
|
|
[UNIT_AUTOMOUNT] = "automount",
|
|
[UNIT_SWAP] = "swap",
|
|
[UNIT_TIMER] = "timer",
|
|
[UNIT_PATH] = "path",
|
|
[UNIT_SLICE] = "slice",
|
|
[UNIT_SCOPE] = "scope"
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
|
|
|
|
static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
|
|
[UNIT_STUB] = "stub",
|
|
[UNIT_LOADED] = "loaded",
|
|
[UNIT_NOT_FOUND] = "not-found",
|
|
[UNIT_ERROR] = "error",
|
|
[UNIT_MERGED] = "merged",
|
|
[UNIT_MASKED] = "masked"
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
|
|
|
|
static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
|
|
[UNIT_REQUIRES] = "Requires",
|
|
[UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
|
|
[UNIT_REQUISITE] = "Requisite",
|
|
[UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
|
|
[UNIT_WANTS] = "Wants",
|
|
[UNIT_BINDS_TO] = "BindsTo",
|
|
[UNIT_PART_OF] = "PartOf",
|
|
[UNIT_REQUIRED_BY] = "RequiredBy",
|
|
[UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
|
|
[UNIT_REQUISITE_OF] = "RequisiteOf",
|
|
[UNIT_REQUISITE_OF_OVERRIDABLE] = "RequisiteOfOverridable",
|
|
[UNIT_WANTED_BY] = "WantedBy",
|
|
[UNIT_BOUND_BY] = "BoundBy",
|
|
[UNIT_CONSISTS_OF] = "ConsistsOf",
|
|
[UNIT_CONFLICTS] = "Conflicts",
|
|
[UNIT_CONFLICTED_BY] = "ConflictedBy",
|
|
[UNIT_BEFORE] = "Before",
|
|
[UNIT_AFTER] = "After",
|
|
[UNIT_ON_FAILURE] = "OnFailure",
|
|
[UNIT_TRIGGERS] = "Triggers",
|
|
[UNIT_TRIGGERED_BY] = "TriggeredBy",
|
|
[UNIT_PROPAGATES_RELOAD_TO] = "PropagatesReloadTo",
|
|
[UNIT_RELOAD_PROPAGATED_FROM] = "ReloadPropagatedFrom",
|
|
[UNIT_JOINS_NAMESPACE_OF] = "JoinsNamespaceOf",
|
|
[UNIT_REFERENCES] = "References",
|
|
[UNIT_REFERENCED_BY] = "ReferencedBy",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
|