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git.ipfire.org Git - thirdparty/systemd.git/blob - src/shared/specifier.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2010 Lennart Poettering
13 #include <sys/utsname.h>
17 #include "alloc-util.h"
19 #include "hostname-util.h"
21 #include "specifier.h"
22 #include "string-util.h"
24 #include "user-util.h"
27 * Generic infrastructure for replacing %x style specifiers in
28 * strings. Will call a callback for each replacement.
32 /* Any ASCII character or digit: our pool of potential specifiers,
33 * and "%" used for escaping. */
34 #define POSSIBLE_SPECIFIERS ALPHANUMERICAL "%"
36 int specifier_printf(const char *text
, const Specifier table
[], void *userdata
, char **_ret
) {
37 size_t l
, allocated
= 0;
38 _cleanup_free_
char *ret
= NULL
;
48 if (!GREEDY_REALLOC(ret
, allocated
, l
+ 1))
52 for (f
= text
; *f
; f
++, l
--)
59 for (i
= table
; i
->specifier
; i
++)
60 if (i
->specifier
== *f
)
64 _cleanup_free_
char *w
= NULL
;
67 r
= i
->lookup(i
->specifier
, i
->data
, userdata
, &w
);
74 if (!GREEDY_REALLOC(ret
, allocated
, j
+ k
+ l
+ 1))
76 memcpy(ret
+ j
, w
, k
);
78 } else if (strchr(POSSIBLE_SPECIFIERS
, *f
))
79 /* Oops, an unknown specifier. */
93 /* If string ended with a stray %, also end with % */
98 /* Try to deallocate unused bytes, but don't sweat it too much */
99 if ((size_t)(t
- ret
) < allocated
) {
100 t
= realloc(ret
, t
- ret
);
105 *_ret
= TAKE_PTR(ret
);
109 /* Generic handler for simple string replacements */
111 int specifier_string(char specifier
, void *data
, void *userdata
, char **ret
) {
114 n
= strdup(strempty(data
));
122 int specifier_machine_id(char specifier
, void *data
, void *userdata
, char **ret
) {
127 r
= sd_id128_get_machine(&id
);
135 *ret
= sd_id128_to_string(id
, n
);
139 int specifier_boot_id(char specifier
, void *data
, void *userdata
, char **ret
) {
144 r
= sd_id128_get_boot(&id
);
152 *ret
= sd_id128_to_string(id
, n
);
156 int specifier_host_name(char specifier
, void *data
, void *userdata
, char **ret
) {
159 n
= gethostname_malloc();
167 int specifier_kernel_release(char specifier
, void *data
, void *userdata
, char **ret
) {
176 n
= strdup(uts
.release
);
184 int specifier_user_name(char specifier
, void *data
, void *userdata
, char **ret
) {
187 /* If we are UID 0 (root), this will not result in NSS, otherwise it might. This is good, as we want to be able
188 * to run this in PID 1, where our user ID is 0, but where NSS lookups are not allowed.
190 * We don't use getusername_malloc() here, because we don't want to look at $USER, to remain consistent with
191 * specifer_user_id() below.
194 t
= uid_to_name(getuid());
202 int specifier_user_id(char specifier
, void *data
, void *userdata
, char **ret
) {
204 if (asprintf(ret
, UID_FMT
, getuid()) < 0)
210 int specifier_user_home(char specifier
, void *data
, void *userdata
, char **ret
) {
212 /* On PID 1 (which runs as root) this will not result in NSS,
213 * which is good. See above */
215 return get_home_dir(ret
);
218 int specifier_user_shell(char specifier
, void *data
, void *userdata
, char **ret
) {
220 /* On PID 1 (which runs as root) this will not result in NSS,
221 * which is good. See above */
223 return get_shell(ret
);
226 int specifier_tmp_dir(char specifier
, void *data
, void *userdata
, char **ret
) {
243 int specifier_var_tmp_dir(char specifier
, void *data
, void *userdata
, char **ret
) {
260 int specifier_escape_strv(char **l
, char ***ret
) {
265 if (strv_isempty(l
)) {
270 z
= new(char*, strv_length(l
)+1);
274 for (p
= l
, q
= z
; *p
; p
++, q
++) {
276 *q
= specifier_escape(*p
);