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);