mirror of
https://github.com/mozilla/gecko-dev.git
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336 lines
7.0 KiB
C++
336 lines
7.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "DaemonSocketPDUHelpers.h"
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#include <limits>
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// Enable this constant to abort Gecko on IPC errors. This is helpful
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// for debugging, but should *never* be enabled by default.
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#define MOZ_HAL_ABORT_ON_IPC_ERRORS (0)
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#ifdef CHROMIUM_LOG
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#undef CHROMIUM_LOG
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#endif
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#if defined(MOZ_WIDGET_GONK)
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#include <android/log.h>
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#define CHROMIUM_LOG(args...) \
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__android_log_print(ANDROID_LOG_INFO, "HAL-IPC", args);
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#define CHROMIUM_LOG_VA(fmt, ap) \
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__android_log_vprint(ANDROID_LOG_INFO, "HAL-IPC", fmt, ap);
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#else
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#include <stdio.h>
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#define IODEBUG true
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#define CHROMIUM_LOG(args...) if (IODEBUG) { printf(args); }
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#define CHROMIUM_LOG_VA(fmt, ap) if (IODEBUG) { vprintf(fmt, ap); }
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#endif
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namespace mozilla {
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namespace ipc {
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namespace DaemonSocketPDUHelpers {
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//
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// Logging
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//
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namespace detail {
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void
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LogProtocolError(const char* aFmt, ...)
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{
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va_list ap;
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va_start(ap, aFmt);
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CHROMIUM_LOG_VA(aFmt, ap);
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va_end(ap);
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if (MOZ_HAL_ABORT_ON_IPC_ERRORS) {
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MOZ_CRASH("HAL IPC protocol error");
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}
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}
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} // namespace detail
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//
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// Conversion
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//
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nsresult
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Convert(bool aIn, uint8_t& aOut)
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{
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static const uint8_t sValue[] = {
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[false] = 0x00,
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[true] = 0x01
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};
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if (MOZ_HAL_IPC_CONVERT_WARN_IF(
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aIn >= MOZ_ARRAY_LENGTH(sValue), bool, uint8_t)) {
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aOut = 0;
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return NS_ERROR_ILLEGAL_VALUE;
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}
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aOut = sValue[aIn];
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return NS_OK;
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}
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nsresult
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Convert(bool aIn, int32_t& aOut)
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{
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uint8_t out;
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nsresult rv = Convert(aIn, out);
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if (NS_FAILED(rv)) {
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out = 0; // silence compiler warning
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return rv;
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}
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aOut = static_cast<int32_t>(out);
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return NS_OK;
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}
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nsresult
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Convert(int aIn, uint8_t& aOut)
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{
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if (MOZ_HAL_IPC_CONVERT_WARN_IF(
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aIn < std::numeric_limits<uint8_t>::min(), int, uint8_t) ||
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MOZ_HAL_IPC_CONVERT_WARN_IF(
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aIn > std::numeric_limits<uint8_t>::max(), int, uint8_t)) {
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aOut = 0; // silences compiler warning
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return NS_ERROR_ILLEGAL_VALUE;
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}
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aOut = static_cast<uint8_t>(aIn);
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return NS_OK;
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}
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nsresult
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Convert(int aIn, int16_t& aOut)
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{
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if (MOZ_HAL_IPC_CONVERT_WARN_IF(
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aIn < std::numeric_limits<int16_t>::min(), int, int16_t) ||
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MOZ_HAL_IPC_CONVERT_WARN_IF(
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aIn > std::numeric_limits<int16_t>::max(), int, int16_t)) {
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aOut = 0; // silences compiler warning
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return NS_ERROR_ILLEGAL_VALUE;
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}
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aOut = static_cast<int16_t>(aIn);
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return NS_OK;
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}
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nsresult
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Convert(int aIn, int32_t& aOut)
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{
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if (MOZ_HAL_IPC_CONVERT_WARN_IF(
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aIn < std::numeric_limits<int32_t>::min(), int, int32_t) ||
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MOZ_HAL_IPC_CONVERT_WARN_IF(
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aIn > std::numeric_limits<int32_t>::max(), int, int32_t)) {
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aOut = 0; // silences compiler warning
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return NS_ERROR_ILLEGAL_VALUE;
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}
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aOut = static_cast<int32_t>(aIn);
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return NS_OK;
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}
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nsresult
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Convert(uint8_t aIn, bool& aOut)
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{
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static const bool sBool[] = {
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[0x00] = false,
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[0x01] = true
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};
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if (MOZ_HAL_IPC_CONVERT_WARN_IF(
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aIn >= MOZ_ARRAY_LENGTH(sBool), uint8_t, bool)) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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aOut = sBool[aIn];
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return NS_OK;
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}
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nsresult
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Convert(uint8_t aIn, char& aOut)
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{
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aOut = static_cast<char>(aIn);
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return NS_OK;
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}
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nsresult
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Convert(uint8_t aIn, int& aOut)
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{
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aOut = static_cast<int>(aIn);
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return NS_OK;
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}
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nsresult
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Convert(uint8_t aIn, unsigned long& aOut)
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{
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aOut = static_cast<unsigned long>(aIn);
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return NS_OK;
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}
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nsresult
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Convert(uint32_t aIn, int& aOut)
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{
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aOut = static_cast<int>(aIn);
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return NS_OK;
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}
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nsresult
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Convert(uint32_t aIn, uint8_t& aOut)
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{
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if (MOZ_HAL_IPC_CONVERT_WARN_IF(
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aIn < std::numeric_limits<uint8_t>::min(), uint32_t, uint8_t) ||
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MOZ_HAL_IPC_CONVERT_WARN_IF(
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aIn > std::numeric_limits<uint8_t>::max(), uint32_t, uint8_t)) {
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aOut = 0; // silences compiler warning
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return NS_ERROR_ILLEGAL_VALUE;
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}
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aOut = static_cast<uint8_t>(aIn);
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return NS_OK;
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}
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nsresult
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Convert(size_t aIn, uint16_t& aOut)
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{
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if (MOZ_HAL_IPC_CONVERT_WARN_IF(aIn >= (1ul << 16), size_t, uint16_t)) {
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aOut = 0; // silences compiler warning
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return NS_ERROR_ILLEGAL_VALUE;
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}
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aOut = static_cast<uint16_t>(aIn);
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return NS_OK;
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}
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//
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// Packing
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//
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nsresult
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PackPDU(bool aIn, DaemonSocketPDU& aPDU)
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{
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return PackPDU(PackConversion<bool, uint8_t>(aIn), aPDU);
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}
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nsresult
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PackPDU(const DaemonSocketPDUHeader& aIn, DaemonSocketPDU& aPDU)
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{
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nsresult rv = PackPDU(aIn.mService, aPDU);
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if (NS_FAILED(rv)) {
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return rv;
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}
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rv = PackPDU(aIn.mOpcode, aPDU);
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if (NS_FAILED(rv)) {
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return rv;
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}
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rv = PackPDU(aIn.mLength, aPDU);
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if (NS_FAILED(rv)) {
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return rv;
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}
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return NS_OK;
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}
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//
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// Unpacking
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//
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nsresult
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UnpackPDU(DaemonSocketPDU& aPDU, bool& aOut)
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{
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return UnpackPDU(aPDU, UnpackConversion<uint8_t, bool>(aOut));
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}
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nsresult
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UnpackPDU(DaemonSocketPDU& aPDU, char& aOut)
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{
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return UnpackPDU(aPDU, UnpackConversion<uint8_t, char>(aOut));
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}
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nsresult
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UnpackPDU(DaemonSocketPDU& aPDU, nsDependentCString& aOut)
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{
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// We get a pointer to the first character in the PDU, a length
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// of 1 ensures we consume the \0 byte. With 'str' pointing to
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// the string in the PDU, we can copy the actual bytes.
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const char* str = reinterpret_cast<const char*>(aPDU.Consume(1));
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if (MOZ_HAL_IPC_UNPACK_WARN_IF(!str, nsDependentCString)) {
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return NS_ERROR_ILLEGAL_VALUE; // end of PDU
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}
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const char* end = static_cast<char*>(memchr(str, '\0', aPDU.GetSize() + 1));
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if (MOZ_HAL_IPC_UNPACK_WARN_IF(!end, nsDependentCString)) {
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return NS_ERROR_ILLEGAL_VALUE; // no string terminator
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}
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ptrdiff_t len = end - str;
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const uint8_t* rest = aPDU.Consume(len);
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if (MOZ_HAL_IPC_UNPACK_WARN_IF(!rest, nsDependentCString)) {
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// We couldn't consume bytes that should have been there.
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return NS_ERROR_ILLEGAL_VALUE;
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}
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aOut.Rebind(str, len);
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return NS_OK;
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}
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nsresult
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UnpackPDU(DaemonSocketPDU& aPDU, const UnpackCString0& aOut)
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{
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nsDependentCString cstring;
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nsresult rv = UnpackPDU(aPDU, cstring);
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if (NS_FAILED(rv)) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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aOut.mString->AssignASCII(cstring.get(), cstring.Length());
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return NS_OK;
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}
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nsresult
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UnpackPDU(DaemonSocketPDU& aPDU, const UnpackString0& aOut)
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{
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nsDependentCString cstring;
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nsresult rv = UnpackPDU(aPDU, cstring);
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if (NS_FAILED(rv)) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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*aOut.mString = NS_ConvertUTF8toUTF16(cstring);
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return NS_OK;
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}
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//
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// Init operators
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//
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void
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PDUInitOp::WarnAboutTrailingData() const
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{
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size_t size = mPDU->GetSize();
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if (MOZ_LIKELY(!size)) {
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return;
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}
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uint8_t service, opcode;
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uint16_t payloadSize;
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mPDU->GetHeader(service, opcode, payloadSize);
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detail::LogProtocolError(
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"Unpacked PDU of type (%x,%x) still contains %zu Bytes of data.",
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service, opcode, size);
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}
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} // namespace DaemonSocketPDUHelpers
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} // namespace ipc
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} // namespace mozilla
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