1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
28 #include <selinux/selinux.h>
32 #include "condition.h"
34 Condition
* condition_new(ConditionType type
, const char *parameter
, bool trigger
, bool negate
) {
37 if (!(c
= new0(Condition
, 1)))
45 if (!(c
->parameter
= strdup(parameter
))) {
53 void condition_free(Condition
*c
) {
60 void condition_free_list(Condition
*first
) {
63 LIST_FOREACH_SAFE(conditions
, c
, n
, first
)
67 static bool test_kernel_command_line(const char *parameter
) {
68 char *line
, *w
, *state
, *word
= NULL
;
76 if (detect_virtualization(NULL
) > 0)
79 if ((r
= read_one_line_file("/proc/cmdline", &line
)) < 0) {
80 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r
));
84 equal
= !!strchr(parameter
, '=');
85 pl
= strlen(parameter
);
87 FOREACH_WORD_QUOTED(w
, l
, line
, state
) {
90 if (!(word
= strndup(w
, l
)))
94 if (streq(word
, parameter
)) {
99 if (startswith(word
, parameter
) && (word
[pl
] == '=' || word
[pl
] == 0)) {
113 static bool test_virtualization(const char *parameter
) {
119 if ((r
= detect_virtualization(&id
)) < 0) {
120 log_warning("Failed to detect virtualization, ignoring: %s", strerror(-r
));
124 b
= parse_boolean(parameter
);
129 if (r
== 0 && b
== 0)
132 return streq(parameter
, id
);
135 static bool test_security(const char *parameter
) {
137 if (streq(parameter
, "selinux"))
138 return is_selinux_enabled() > 0;
143 bool condition_test(Condition
*c
) {
148 case CONDITION_PATH_EXISTS
:
149 return (access(c
->parameter
, F_OK
) >= 0) == !c
->negate
;
151 case CONDITION_PATH_IS_DIRECTORY
: {
154 if (lstat(c
->parameter
, &st
) < 0)
156 return S_ISDIR(st
.st_mode
) == !c
->negate
;
159 case CONDITION_DIRECTORY_NOT_EMPTY
: {
162 k
= dir_is_empty(c
->parameter
);
163 return !(k
== -ENOENT
|| k
> 0) == !c
->negate
;
166 case CONDITION_KERNEL_COMMAND_LINE
:
167 return test_kernel_command_line(c
->parameter
) == !c
->negate
;
169 case CONDITION_VIRTUALIZATION
:
170 return test_virtualization(c
->parameter
) == !c
->negate
;
172 case CONDITION_SECURITY
:
173 return test_security(c
->parameter
) == !c
->negate
;
179 assert_not_reached("Invalid condition type.");
183 bool condition_test_list(Condition
*first
) {
187 /* If the condition list is empty, then it is true */
191 /* Otherwise, if all of the non-trigger conditions apply and
192 * if any of the trigger conditions apply (unless there are
193 * none) we return true */
194 LIST_FOREACH(conditions
, c
, first
) {
197 b
= condition_test(c
);
199 if (!c
->trigger
&& !b
)
202 if (c
->trigger
&& triggered
<= 0)
206 return triggered
!= 0;
209 void condition_dump(Condition
*c
, FILE *f
, const char *prefix
) {
219 condition_type_to_string(c
->type
),
220 c
->trigger
? "|" : "",
221 c
->negate
? "!" : "",
225 void condition_dump_list(Condition
*first
, FILE *f
, const char *prefix
) {
228 LIST_FOREACH(conditions
, c
, first
)
229 condition_dump(c
, f
, prefix
);
232 static const char* const condition_type_table
[_CONDITION_TYPE_MAX
] = {
233 [CONDITION_PATH_EXISTS
] = "ConditionPathExists",
234 [CONDITION_PATH_IS_DIRECTORY
] = "ConditionPathIsDirectory",
235 [CONDITION_DIRECTORY_NOT_EMPTY
] = "ConditionDirectoryNotEmpty",
236 [CONDITION_KERNEL_COMMAND_LINE
] = "ConditionKernelCommandLine",
237 [CONDITION_VIRTUALIZATION
] = "ConditionVirtualization",
238 [CONDITION_SECURITY
] = "ConditionSecurity",
239 [CONDITION_NULL
] = "ConditionNull"
242 DEFINE_STRING_TABLE_LOOKUP(condition_type
, ConditionType
);