1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "log.h"
18
19#include <fcntl.h>
20#include <linux/audit.h>
21#include <string.h>
22#include <unistd.h>
23
24#include <android-base/logging.h>
25#include <cutils/android_reboot.h>
26#include <selinux/selinux.h>
27
28#include "reboot.h"
29
30namespace android {
31namespace init {
32
33static void InitAborter(const char* abort_message) {
34    // When init forks, it continues to use this aborter for LOG(FATAL), but we want children to
35    // simply abort instead of trying to reboot the system.
36    if (getpid() != 1) {
37        android::base::DefaultAborter(abort_message);
38        return;
39    }
40
41    // DoReboot() does a lot to try to shutdown the system cleanly.  If something happens to call
42    // LOG(FATAL) in the shutdown path, we want to catch this and immediately use the syscall to
43    // reboot instead of recursing here.
44    static bool has_aborted = false;
45    if (!has_aborted) {
46        has_aborted = true;
47        // Do not queue "shutdown" trigger since we want to shutdown immediately and it's not likely
48        // that we can even run the ActionQueue at this point.
49        DoReboot(ANDROID_RB_RESTART2, "reboot", "bootloader", false);
50    } else {
51        RebootSystem(ANDROID_RB_RESTART2, "bootloader");
52    }
53}
54
55void InitKernelLogging(char* argv[]) {
56    // Make stdin/stdout/stderr all point to /dev/null.
57    int fd = open("/sys/fs/selinux/null", O_RDWR);
58    if (fd == -1) {
59        int saved_errno = errno;
60        android::base::InitLogging(argv, &android::base::KernelLogger, InitAborter);
61        errno = saved_errno;
62        PLOG(FATAL) << "Couldn't open /sys/fs/selinux/null";
63    }
64    dup2(fd, 0);
65    dup2(fd, 1);
66    dup2(fd, 2);
67    if (fd > 2) close(fd);
68
69    android::base::InitLogging(argv, &android::base::KernelLogger, InitAborter);
70}
71
72int selinux_klog_callback(int type, const char *fmt, ...) {
73    android::base::LogSeverity severity = android::base::ERROR;
74    if (type == SELINUX_WARNING) {
75        severity = android::base::WARNING;
76    } else if (type == SELINUX_INFO) {
77        severity = android::base::INFO;
78    }
79    char buf[1024];
80    va_list ap;
81    va_start(ap, fmt);
82    vsnprintf(buf, sizeof(buf), fmt, ap);
83    va_end(ap);
84    android::base::KernelLogger(android::base::MAIN, severity, "selinux", nullptr, 0, buf);
85    return 0;
86}
87
88}  // namespace init
89}  // namespace android
90