1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
|
/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/utsname.h>
#include "sd-id128.h"
#include "alloc-util.h"
#include "fs-util.h"
#include "hostname-util.h"
#include "macro.h"
#include "specifier.h"
#include "string-util.h"
#include "strv.h"
#include "user-util.h"
/*
* Generic infrastructure for replacing %x style specifiers in
* strings. Will call a callback for each replacement.
*/
/* Any ASCII character or digit: our pool of potential specifiers,
* and "%" used for escaping. */
#define POSSIBLE_SPECIFIERS ALPHANUMERICAL "%"
int specifier_printf(const char *text, const Specifier table[], const void *userdata, char **_ret) {
size_t l, allocated = 0;
_cleanup_free_ char *ret = NULL;
char *t;
const char *f;
bool percent = false;
int r;
assert(text);
assert(table);
l = strlen(text);
if (!GREEDY_REALLOC(ret, allocated, l + 1))
return -ENOMEM;
t = ret;
for (f = text; *f; f++, l--)
if (percent) {
if (*f == '%')
*(t++) = '%';
else {
const Specifier *i;
for (i = table; i->specifier; i++)
if (i->specifier == *f)
break;
if (i->lookup) {
_cleanup_free_ char *w = NULL;
size_t k, j;
r = i->lookup(i->specifier, i->data, userdata, &w);
if (r < 0)
return r;
j = t - ret;
k = strlen(w);
if (!GREEDY_REALLOC(ret, allocated, j + k + l + 1))
return -ENOMEM;
memcpy(ret + j, w, k);
t = ret + j + k;
} else if (strchr(POSSIBLE_SPECIFIERS, *f))
/* Oops, an unknown specifier. */
return -EBADSLT;
else {
*(t++) = '%';
*(t++) = *f;
}
}
percent = false;
} else if (*f == '%')
percent = true;
else
*(t++) = *f;
/* If string ended with a stray %, also end with % */
if (percent)
*(t++) = '%';
*(t++) = 0;
/* Try to deallocate unused bytes, but don't sweat it too much */
if ((size_t)(t - ret) < allocated) {
t = realloc(ret, t - ret);
if (t)
ret = t;
}
*_ret = TAKE_PTR(ret);
return 0;
}
/* Generic handler for simple string replacements */
int specifier_string(char specifier, const void *data, const void *userdata, char **ret) {
char *n;
n = strdup(strempty(data));
if (!n)
return -ENOMEM;
*ret = n;
return 0;
}
int specifier_machine_id(char specifier, const void *data, const void *userdata, char **ret) {
sd_id128_t id;
char *n;
int r;
r = sd_id128_get_machine(&id);
if (r < 0)
return r;
n = new(char, 33);
if (!n)
return -ENOMEM;
*ret = sd_id128_to_string(id, n);
return 0;
}
int specifier_boot_id(char specifier, const void *data, const void *userdata, char **ret) {
sd_id128_t id;
char *n;
int r;
r = sd_id128_get_boot(&id);
if (r < 0)
return r;
n = new(char, 33);
if (!n)
return -ENOMEM;
*ret = sd_id128_to_string(id, n);
return 0;
}
int specifier_host_name(char specifier, const void *data, const void *userdata, char **ret) {
char *n;
n = gethostname_malloc();
if (!n)
return -ENOMEM;
*ret = n;
return 0;
}
int specifier_kernel_release(char specifier, const void *data, const void *userdata, char **ret) {
struct utsname uts;
char *n;
int r;
r = uname(&uts);
if (r < 0)
return -errno;
n = strdup(uts.release);
if (!n)
return -ENOMEM;
*ret = n;
return 0;
}
int specifier_group_name(char specifier, const void *data, const void *userdata, char **ret) {
char *t;
t = gid_to_name(getgid());
if (!t)
return -ENOMEM;
*ret = t;
return 0;
}
int specifier_group_id(char specifier, const void *data, const void *userdata, char **ret) {
if (asprintf(ret, UID_FMT, getgid()) < 0)
return -ENOMEM;
return 0;
}
int specifier_user_name(char specifier, const void *data, const void *userdata, char **ret) {
char *t;
/* If we are UID 0 (root), this will not result in NSS, otherwise it might. This is good, as we want to be able
* to run this in PID 1, where our user ID is 0, but where NSS lookups are not allowed.
* We don't use getusername_malloc() here, because we don't want to look at $USER, to remain consistent with
* specifer_user_id() below.
*/
t = uid_to_name(getuid());
if (!t)
return -ENOMEM;
*ret = t;
return 0;
}
int specifier_user_id(char specifier, const void *data, const void *userdata, char **ret) {
if (asprintf(ret, UID_FMT, getuid()) < 0)
return -ENOMEM;
return 0;
}
int specifier_user_home(char specifier, const void *data, const void *userdata, char **ret) {
/* On PID 1 (which runs as root) this will not result in NSS,
* which is good. See above */
return get_home_dir(ret);
}
int specifier_user_shell(char specifier, const void *data, const void *userdata, char **ret) {
/* On PID 1 (which runs as root) this will not result in NSS,
* which is good. See above */
return get_shell(ret);
}
int specifier_tmp_dir(char specifier, const void *data, const void *userdata, char **ret) {
const char *p;
char *copy;
int r;
r = tmp_dir(&p);
if (r < 0)
return r;
copy = strdup(p);
if (!copy)
return -ENOMEM;
*ret = copy;
return 0;
}
int specifier_var_tmp_dir(char specifier, const void *data, const void *userdata, char **ret) {
const char *p;
char *copy;
int r;
r = var_tmp_dir(&p);
if (r < 0)
return r;
copy = strdup(p);
if (!copy)
return -ENOMEM;
*ret = copy;
return 0;
}
int specifier_escape_strv(char **l, char ***ret) {
char **z, **p, **q;
assert(ret);
if (strv_isempty(l)) {
*ret = NULL;
return 0;
}
z = new(char*, strv_length(l)+1);
if (!z)
return -ENOMEM;
for (p = l, q = z; *p; p++, q++) {
*q = specifier_escape(*p);
if (!*q) {
strv_free(z);
return -ENOMEM;
}
}
*q = NULL;
*ret = z;
return 0;
}
|
