mirror of
https://github.com/google/sandboxed-api.git
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139 lines
4.4 KiB
C++
139 lines
4.4 KiB
C++
// Copyright 2019 Google LLC
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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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#include "sandboxed_api/util/raw_logging.h"
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#include <sys/syscall.h>
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#include <unistd.h>
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#include <cstdarg>
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#include <cstddef>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <limits>
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#include "absl/base/attributes.h"
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#include "absl/base/config.h"
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#include "absl/base/log_severity.h"
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#include "absl/strings/numbers.h"
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#include "absl/strings/str_cat.h"
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#include "absl/strings/str_format.h"
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static const char kTruncated[] = " ... (message truncated)\n";
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// sprintf the format to the buffer, adjusting *buf and *size to reflect the
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// consumed bytes, and return whether the message fit without truncation. If
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// truncation occurred, if possible leave room in the buffer for the message
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// kTruncated[].
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inline static bool VADoRawLog(char** buf, int* size, const char* format,
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va_list ap) ABSL_PRINTF_ATTRIBUTE(3, 0);
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inline static bool VADoRawLog(char** buf, int* size, const char* format,
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va_list ap) {
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int n = vsnprintf(*buf, *size, format, ap);
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bool result = true;
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if (n < 0 || n > *size) {
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result = false;
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if (static_cast<size_t>(*size) > sizeof(kTruncated)) {
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n = *size - sizeof(kTruncated); // room for truncation message
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} else {
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n = 0; // no room for truncation message
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}
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}
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*size -= n;
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*buf += n;
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return result;
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}
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namespace {
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// CAVEAT: vsnprintf called from *DoRawLog below has some (exotic) code paths
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// that invoke malloc() and getenv() that might acquire some locks.
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// Helper for RawLog below.
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// *DoRawLog writes to *buf of *size and move them past the written portion.
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// It returns true iff there was no overflow or error.
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bool DoRawLog(char** buf, int* size, const char* format, ...)
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ABSL_PRINTF_ATTRIBUTE(3, 4);
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bool DoRawLog(char** buf, int* size, const char* format, ...) {
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va_list ap;
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va_start(ap, format);
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int n = vsnprintf(*buf, *size, format, ap);
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va_end(ap);
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if (n < 0 || n > *size) return false;
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*size -= n;
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*buf += n;
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return true;
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}
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void RawLogVA(absl::LogSeverity severity, const char* file, int line,
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const char* format, va_list ap) ABSL_PRINTF_ATTRIBUTE(4, 0);
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void RawLogVA(absl::LogSeverity severity, const char* file, int line,
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const char* format, va_list ap) {
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char buffer[sapi::raw_logging_internal::kLogBufSize];
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char* buf = buffer;
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int size = sizeof(buffer);
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DoRawLog(&buf, &size, "[%s : %d] RAW: ", file, line);
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bool no_chop = VADoRawLog(&buf, &size, format, ap);
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if (no_chop) {
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DoRawLog(&buf, &size, "\n");
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} else {
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DoRawLog(&buf, &size, "%s", kTruncated);
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}
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sapi::raw_logging_internal::SafeWriteToStderr(buffer, strlen(buffer));
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// Abort the process after logging a FATAL message, even if the output itself
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// was suppressed.
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if (severity == absl::LogSeverity::kFatal) {
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abort();
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}
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}
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} // namespace
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namespace sapi::raw_logging_internal {
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void RawLog(absl::LogSeverity severity, const char* file, int line,
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const char* format, ...) ABSL_PRINTF_ATTRIBUTE(4, 5);
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void RawLog(absl::LogSeverity severity, const char* file, int line,
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const char* format, ...) {
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va_list ap;
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va_start(ap, format);
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RawLogVA(severity, file, line, format, ap);
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va_end(ap);
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}
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void SafeWriteToStderr(const char* s, size_t len) {
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syscall(SYS_write, STDERR_FILENO, s, len);
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}
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bool VLogIsOn(int verbose_level) {
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static int external_verbose_level = [] {
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int external_verbose_level = std::numeric_limits<int>::max();
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char* env_var = getenv("SAPI_VLOG_LEVEL");
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if (!env_var) {
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return external_verbose_level;
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}
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SAPI_RAW_CHECK(absl::SimpleAtoi(env_var, &external_verbose_level) &&
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external_verbose_level >= 0,
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"SAPI_VLOG_LEVEL needs to be an integer >= 0");
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return external_verbose_level;
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}();
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return verbose_level >= external_verbose_level;
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}
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} // namespace sapi::raw_logging_internal
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