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 Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include <sys/capability.h>
27 #include <sys/statvfs.h>
31 #include <selinux/selinux.h>
34 #include <systemd/sd-id128.h>
36 #include "condition.h"
38 #include "path-util.h"
41 Condition* condition_new(ConditionType type, const char *parameter, bool trigger, bool negate) {
44 assert(type < _CONDITION_TYPE_MAX);
46 c = new0(Condition, 1);
55 c->parameter = strdup(parameter);
65 void condition_free(Condition *c) {
72 void condition_free_list(Condition *first) {
75 LIST_FOREACH_SAFE(conditions, c, n, first)
79 static bool test_kernel_command_line(const char *parameter) {
80 char *line, *w, *state, *word = NULL;
88 if (detect_container(NULL) > 0)
91 r = read_one_line_file("/proc/cmdline", &line);
93 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
97 equal = !!strchr(parameter, '=');
98 pl = strlen(parameter);
100 FOREACH_WORD_QUOTED(w, l, line, state) {
103 word = strndup(w, l);
108 if (streq(word, parameter)) {
113 if (startswith(word, parameter) && (word[pl] == '=' || word[pl] == 0)) {
127 static bool test_virtualization(const char *parameter) {
134 v = detect_virtualization(&id);
136 log_warning("Failed to detect virtualization, ignoring: %s", strerror(-v));
140 /* First, compare with yes/no */
141 b = parse_boolean(parameter);
146 if (v == 0 && b == 0)
149 /* Then, compare categorization */
150 if (v == VIRTUALIZATION_VM && streq(parameter, "vm"))
153 if (v == VIRTUALIZATION_CONTAINER && streq(parameter, "container"))
156 /* Finally compare id */
157 return v > 0 && streq(parameter, id);
160 static bool test_security(const char *parameter) {
162 if (streq(parameter, "selinux"))
163 return is_selinux_enabled() > 0;
168 static bool test_capability(const char *parameter) {
172 unsigned long long capabilities = (unsigned long long) -1;
174 /* If it's an invalid capability, we don't have it */
176 if (cap_from_name(parameter, &value) < 0)
179 /* If it's a valid capability we default to assume
182 f = fopen("/proc/self/status", "re");
186 while (fgets(line, sizeof(line), f)) {
189 if (startswith(line, "CapBnd:")) {
190 (void) sscanf(line+7, "%llx", &capabilities);
197 return !!(capabilities & (1ULL << value));
200 static bool test_host(const char *parameter) {
206 if (sd_id128_from_string(parameter, &x) >= 0) {
208 r = sd_id128_get_machine(&y);
212 return sd_id128_equal(x, y);
215 h = gethostname_malloc();
219 b = fnmatch(parameter, h, FNM_CASEFOLD) == 0;
225 static bool test_ac_power(const char *parameter) {
228 r = parse_boolean(parameter);
232 return (on_ac_power() != 0) == !!r;
235 bool condition_test(Condition *c) {
240 case CONDITION_PATH_EXISTS:
241 return (access(c->parameter, F_OK) >= 0) == !c->negate;
243 case CONDITION_PATH_EXISTS_GLOB:
244 return (glob_exists(c->parameter) > 0) == !c->negate;
246 case CONDITION_PATH_IS_DIRECTORY: {
249 if (stat(c->parameter, &st) < 0)
251 return S_ISDIR(st.st_mode) == !c->negate;
254 case CONDITION_PATH_IS_SYMBOLIC_LINK: {
257 if (lstat(c->parameter, &st) < 0)
259 return S_ISLNK(st.st_mode) == !c->negate;
262 case CONDITION_PATH_IS_MOUNT_POINT:
263 return (path_is_mount_point(c->parameter, true) > 0) == !c->negate;
265 case CONDITION_PATH_IS_READ_WRITE:
266 return (path_is_read_only_fs(c->parameter) > 0) == c->negate;
268 case CONDITION_DIRECTORY_NOT_EMPTY: {
271 k = dir_is_empty(c->parameter);
272 return !(k == -ENOENT || k > 0) == !c->negate;
275 case CONDITION_FILE_NOT_EMPTY: {
278 if (stat(c->parameter, &st) < 0)
281 return (S_ISREG(st.st_mode) && st.st_size > 0) == !c->negate;
284 case CONDITION_FILE_IS_EXECUTABLE: {
287 if (stat(c->parameter, &st) < 0)
290 return (S_ISREG(st.st_mode) && (st.st_mode & 0111)) == !c->negate;
293 case CONDITION_KERNEL_COMMAND_LINE:
294 return test_kernel_command_line(c->parameter) == !c->negate;
296 case CONDITION_VIRTUALIZATION:
297 return test_virtualization(c->parameter) == !c->negate;
299 case CONDITION_SECURITY:
300 return test_security(c->parameter) == !c->negate;
302 case CONDITION_CAPABILITY:
303 return test_capability(c->parameter) == !c->negate;
306 return test_host(c->parameter) == !c->negate;
308 case CONDITION_AC_POWER:
309 return test_ac_power(c->parameter) == !c->negate;
315 assert_not_reached("Invalid condition type.");
319 bool condition_test_list(Condition *first) {
323 /* If the condition list is empty, then it is true */
327 /* Otherwise, if all of the non-trigger conditions apply and
328 * if any of the trigger conditions apply (unless there are
329 * none) we return true */
330 LIST_FOREACH(conditions, c, first) {
333 b = condition_test(c);
335 if (!c->trigger && !b)
338 if (c->trigger && triggered <= 0)
342 return triggered != 0;
345 void condition_dump(Condition *c, FILE *f, const char *prefix) {
355 condition_type_to_string(c->type),
356 c->trigger ? "|" : "",
357 c->negate ? "!" : "",
361 void condition_dump_list(Condition *first, FILE *f, const char *prefix) {
364 LIST_FOREACH(conditions, c, first)
365 condition_dump(c, f, prefix);
368 static const char* const condition_type_table[_CONDITION_TYPE_MAX] = {
369 [CONDITION_PATH_EXISTS] = "ConditionPathExists",
370 [CONDITION_PATH_EXISTS_GLOB] = "ConditionPathExistsGlob",
371 [CONDITION_PATH_IS_DIRECTORY] = "ConditionPathIsDirectory",
372 [CONDITION_PATH_IS_SYMBOLIC_LINK] = "ConditionPathIsSymbolicLink",
373 [CONDITION_PATH_IS_MOUNT_POINT] = "ConditionPathIsMountPoint",
374 [CONDITION_PATH_IS_READ_WRITE] = "ConditionPathIsReadWrite",
375 [CONDITION_DIRECTORY_NOT_EMPTY] = "ConditionDirectoryNotEmpty",
376 [CONDITION_FILE_NOT_EMPTY] = "ConditionFileNotEmpty",
377 [CONDITION_KERNEL_COMMAND_LINE] = "ConditionKernelCommandLine",
378 [CONDITION_VIRTUALIZATION] = "ConditionVirtualization",
379 [CONDITION_SECURITY] = "ConditionSecurity",
380 [CONDITION_HOST] = "ConditionHost",
381 [CONDITION_AC_POWER] = "ConditionACPower",
382 [CONDITION_NULL] = "ConditionNull"
385 DEFINE_STRING_TABLE_LOOKUP(condition_type, ConditionType);