89 lines
2.9 KiB
C++
89 lines
2.9 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "log.h"
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <selinux/selinux.h>
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static const int kLogSeverityToKLogLevel[] = {
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KLOG_NOTICE_LEVEL, KLOG_DEBUG_LEVEL, KLOG_INFO_LEVEL,
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KLOG_WARNING_LEVEL, KLOG_ERROR_LEVEL, KLOG_ERROR_LEVEL,
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};
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static_assert(arraysize(kLogSeverityToKLogLevel) == android::base::FATAL + 1,
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"Mismatch in size of kLogSeverityToKLogLevel and values in LogSeverity");
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static void KernelLogger(android::base::LogId, android::base::LogSeverity severity,
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const char* tag, const char*, unsigned int, const char* msg) {
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int level = kLogSeverityToKLogLevel[severity];
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if (level > klog_get_level()) return;
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// The kernel's printk buffer is only 1024 bytes.
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// TODO: should we automatically break up long lines into multiple lines?
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// Or we could log but with something like "..." at the end?
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char buf[1024];
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size_t size = snprintf(buf, sizeof(buf), "<%d>%s: %s\n", level, tag, msg);
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if (size > sizeof(buf)) {
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size = snprintf(buf, sizeof(buf), "<%d>%s: %zu-byte message too long for printk\n",
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level, tag, size);
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}
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iovec iov[1];
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iov[0].iov_base = buf;
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iov[0].iov_len = size;
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klog_writev(level, iov, 1);
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}
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void InitKernelLogging(char* argv[]) {
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// Make stdin/stdout/stderr all point to /dev/null.
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int fd = open("/sys/fs/selinux/null", O_RDWR);
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if (fd == -1) {
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int saved_errno = errno;
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android::base::InitLogging(argv, &KernelLogger);
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errno = saved_errno;
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PLOG(FATAL) << "Couldn't open /sys/fs/selinux/null";
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}
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dup2(fd, 0);
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dup2(fd, 1);
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dup2(fd, 2);
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if (fd > 2) close(fd);
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android::base::InitLogging(argv, &KernelLogger);
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klog_set_level(KLOG_NOTICE_LEVEL);
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}
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int selinux_klog_callback(int type, const char *fmt, ...) {
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android::base::LogSeverity severity = android::base::ERROR;
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if (type == SELINUX_WARNING) {
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severity = android::base::WARNING;
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} else if (type == SELINUX_INFO) {
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severity = android::base::INFO;
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}
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char buf[1024];
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va_list ap;
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va_start(ap, fmt);
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vsnprintf(buf, sizeof(buf), fmt, ap);
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va_end(ap);
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KernelLogger(android::base::MAIN, severity, "selinux", nullptr, 0, buf);
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return 0;
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}
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