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-rw-r--r--src/condition.c323
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diff --git a/src/condition.c b/src/condition.c
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--- a/src/condition.c
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-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <stdlib.h>
-#include <errno.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/capability.h>
-
-#ifdef HAVE_SELINUX
-#include <selinux/selinux.h>
-#endif
-
-#include "util.h"
-#include "condition.h"
-#include "virt.h"
-
-Condition* condition_new(ConditionType type, const char *parameter, bool trigger, bool negate) {
- Condition *c;
-
- assert(type < _CONDITION_TYPE_MAX);
-
- c = new0(Condition, 1);
- if (!c)
- return NULL;
-
- c->type = type;
- c->trigger = trigger;
- c->negate = negate;
-
- if (parameter) {
- c->parameter = strdup(parameter);
- if (!c->parameter) {
- free(c);
- return NULL;
- }
- }
-
- return c;
-}
-
-void condition_free(Condition *c) {
- assert(c);
-
- free(c->parameter);
- free(c);
-}
-
-void condition_free_list(Condition *first) {
- Condition *c, *n;
-
- LIST_FOREACH_SAFE(conditions, c, n, first)
- condition_free(c);
-}
-
-static bool test_kernel_command_line(const char *parameter) {
- char *line, *w, *state, *word = NULL;
- bool equal;
- int r;
- size_t l, pl;
- bool found = false;
-
- assert(parameter);
-
- if (detect_container(NULL) > 0)
- return false;
-
- r = read_one_line_file("/proc/cmdline", &line);
- if (r < 0) {
- log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
- return false;
- }
-
- equal = !!strchr(parameter, '=');
- pl = strlen(parameter);
-
- FOREACH_WORD_QUOTED(w, l, line, state) {
-
- free(word);
- word = strndup(w, l);
- if (!word)
- break;
-
- if (equal) {
- if (streq(word, parameter)) {
- found = true;
- break;
- }
- } else {
- if (startswith(word, parameter) && (word[pl] == '=' || word[pl] == 0)) {
- found = true;
- break;
- }
- }
-
- }
-
- free(word);
- free(line);
-
- return found;
-}
-
-static bool test_virtualization(const char *parameter) {
- int b;
- Virtualization v;
- const char *id;
-
- assert(parameter);
-
- v = detect_virtualization(&id);
- if (v < 0) {
- log_warning("Failed to detect virtualization, ignoring: %s", strerror(-v));
- return false;
- }
-
- /* First, compare with yes/no */
- b = parse_boolean(parameter);
-
- if (v > 0 && b > 0)
- return true;
-
- if (v == 0 && b == 0)
- return true;
-
- /* Then, compare categorization */
- if (v == VIRTUALIZATION_VM && streq(parameter, "vm"))
- return true;
-
- if (v == VIRTUALIZATION_CONTAINER && streq(parameter, "container"))
- return true;
-
- /* Finally compare id */
- return v > 0 && streq(parameter, id);
-}
-
-static bool test_security(const char *parameter) {
-#ifdef HAVE_SELINUX
- if (streq(parameter, "selinux"))
- return is_selinux_enabled() > 0;
-#endif
- return false;
-}
-
-static bool test_capability(const char *parameter) {
- cap_value_t value;
- FILE *f;
- char line[LINE_MAX];
- unsigned long long capabilities = (unsigned long long) -1;
-
- /* If it's an invalid capability, we don't have it */
-
- if (cap_from_name(parameter, &value) < 0)
- return false;
-
- /* If it's a valid capability we default to assume
- * that we have it */
-
- f = fopen("/proc/self/status", "re");
- if (!f)
- return true;
-
- while (fgets(line, sizeof(line), f)) {
- truncate_nl(line);
-
- if (startswith(line, "CapBnd:")) {
- (void) sscanf(line+7, "%llx", &capabilities);
- break;
- }
- }
-
- fclose(f);
-
- return !!(capabilities & (1ULL << value));
-}
-
-bool condition_test(Condition *c) {
- assert(c);
-
- switch(c->type) {
-
- case CONDITION_PATH_EXISTS:
- return (access(c->parameter, F_OK) >= 0) == !c->negate;
-
- case CONDITION_PATH_EXISTS_GLOB:
- return (glob_exists(c->parameter) > 0) == !c->negate;
-
- case CONDITION_PATH_IS_DIRECTORY: {
- struct stat st;
-
- if (stat(c->parameter, &st) < 0)
- return c->negate;
- return S_ISDIR(st.st_mode) == !c->negate;
- }
-
- case CONDITION_PATH_IS_SYMBOLIC_LINK: {
- struct stat st;
-
- if (lstat(c->parameter, &st) < 0)
- return c->negate;
- return S_ISLNK(st.st_mode) == !c->negate;
- }
-
- case CONDITION_PATH_IS_MOUNT_POINT:
- return (path_is_mount_point(c->parameter, true) > 0) == !c->negate;
-
- case CONDITION_DIRECTORY_NOT_EMPTY: {
- int k;
-
- k = dir_is_empty(c->parameter);
- return !(k == -ENOENT || k > 0) == !c->negate;
- }
-
- case CONDITION_FILE_IS_EXECUTABLE: {
- struct stat st;
-
- if (stat(c->parameter, &st) < 0)
- return c->negate;
-
- return (S_ISREG(st.st_mode) && (st.st_mode & 0111)) == !c->negate;
- }
-
- case CONDITION_KERNEL_COMMAND_LINE:
- return test_kernel_command_line(c->parameter) == !c->negate;
-
- case CONDITION_VIRTUALIZATION:
- return test_virtualization(c->parameter) == !c->negate;
-
- case CONDITION_SECURITY:
- return test_security(c->parameter) == !c->negate;
-
- case CONDITION_CAPABILITY:
- return test_capability(c->parameter) == !c->negate;
-
- case CONDITION_NULL:
- return !c->negate;
-
- default:
- assert_not_reached("Invalid condition type.");
- }
-}
-
-bool condition_test_list(Condition *first) {
- Condition *c;
- int triggered = -1;
-
- /* If the condition list is empty, then it is true */
- if (!first)
- return true;
-
- /* Otherwise, if all of the non-trigger conditions apply and
- * if any of the trigger conditions apply (unless there are
- * none) we return true */
- LIST_FOREACH(conditions, c, first) {
- bool b;
-
- b = condition_test(c);
-
- if (!c->trigger && !b)
- return false;
-
- if (c->trigger && triggered <= 0)
- triggered = b;
- }
-
- return triggered != 0;
-}
-
-void condition_dump(Condition *c, FILE *f, const char *prefix) {
- assert(c);
- assert(f);
-
- if (!prefix)
- prefix = "";
-
- fprintf(f,
- "%s\t%s: %s%s%s\n",
- prefix,
- condition_type_to_string(c->type),
- c->trigger ? "|" : "",
- c->negate ? "!" : "",
- c->parameter);
-}
-
-void condition_dump_list(Condition *first, FILE *f, const char *prefix) {
- Condition *c;
-
- LIST_FOREACH(conditions, c, first)
- condition_dump(c, f, prefix);
-}
-
-static const char* const condition_type_table[_CONDITION_TYPE_MAX] = {
- [CONDITION_PATH_EXISTS] = "ConditionPathExists",
- [CONDITION_PATH_EXISTS_GLOB] = "ConditionPathExistsGlob",
- [CONDITION_PATH_IS_DIRECTORY] = "ConditionPathIsDirectory",
- [CONDITION_PATH_IS_SYMBOLIC_LINK] = "ConditionPathIsSymbolicLink",
- [CONDITION_PATH_IS_MOUNT_POINT] = "ConditionPathIsMountPoint",
- [CONDITION_DIRECTORY_NOT_EMPTY] = "ConditionDirectoryNotEmpty",
- [CONDITION_KERNEL_COMMAND_LINE] = "ConditionKernelCommandLine",
- [CONDITION_VIRTUALIZATION] = "ConditionVirtualization",
- [CONDITION_SECURITY] = "ConditionSecurity",
- [CONDITION_NULL] = "ConditionNull"
-};
-
-DEFINE_STRING_TABLE_LOOKUP(condition_type, ConditionType);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-14 13:02:27 +0000