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/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "DaemonSocketPDU.h"
#include "mozilla/ipc/DaemonSocketConsumer.h"
#include "nsISupportsImpl.h" // for MOZ_COUNT_CTOR, MOZ_COUNT_DTOR
#ifdef CHROMIUM_LOG
#undef CHROMIUM_LOG
#endif
#include <stdio.h>
#define IODEBUG true
#define CHROMIUM_LOG(args...) if (IODEBUG) printf(args);
namespace mozilla {
namespace ipc {
//
// DaemonSocketPDU
//
DaemonSocketPDU::DaemonSocketPDU(uint8_t aService, uint8_t aOpcode,
uint16_t aPayloadSize)
: mConsumer(nullptr)
{
MOZ_COUNT_CTOR_INHERITED(DaemonSocketPDU, UnixSocketIOBuffer);
// Allocate memory
size_t availableSpace = PDU_HEADER_SIZE + aPayloadSize;
ResetBuffer(new uint8_t[availableSpace], 0, 0, availableSpace);
// Reserve PDU header
uint8_t* data = Append(PDU_HEADER_SIZE);
MOZ_ASSERT(data);
// Setup PDU header
data[PDU_OFF_SERVICE] = aService;
data[PDU_OFF_OPCODE] = aOpcode;
memcpy(data + PDU_OFF_LENGTH, &aPayloadSize, sizeof(aPayloadSize));
}
DaemonSocketPDU::DaemonSocketPDU(size_t aPayloadSize)
: mConsumer(nullptr)
{
MOZ_COUNT_CTOR_INHERITED(DaemonSocketPDU, UnixSocketIOBuffer);
size_t availableSpace = PDU_HEADER_SIZE + aPayloadSize;
ResetBuffer(new uint8_t[availableSpace], 0, 0, availableSpace);
}
DaemonSocketPDU::~DaemonSocketPDU()
{
MOZ_COUNT_DTOR_INHERITED(DaemonSocketPDU, UnixSocketIOBuffer);
UniquePtr<uint8_t[]> data(GetBuffer());
ResetBuffer(nullptr, 0, 0, 0);
}
void
DaemonSocketPDU::GetHeader(uint8_t& aService, uint8_t& aOpcode,
uint16_t& aPayloadSize)
{
memcpy(&aService, GetData(PDU_OFF_SERVICE), sizeof(aService));
memcpy(&aOpcode, GetData(PDU_OFF_OPCODE), sizeof(aOpcode));
memcpy(&aPayloadSize, GetData(PDU_OFF_LENGTH), sizeof(aPayloadSize));
}
ssize_t
DaemonSocketPDU::Send(int aFd)
{
struct iovec iv;
memset(&iv, 0, sizeof(iv));
iv.iov_base = GetData(GetLeadingSpace());
iv.iov_len = GetSize();
struct msghdr msg;
memset(&msg, 0, sizeof(msg));
msg.msg_iov = &iv;
msg.msg_iovlen = 1;
msg.msg_control = nullptr;
msg.msg_controllen = 0;
ssize_t res = TEMP_FAILURE_RETRY(sendmsg(aFd, &msg, 0));
if (res < 0) {
MOZ_ASSERT(errno != EBADF); /* internal error */
OnError("sendmsg", errno);
return -1;
}
Consume(res);
if (mConsumer) {
// We successfully sent a PDU, now store the
// result handler in the consumer.
mConsumer->StoreResultHandler(*this);
}
return res;
}
#define CMSGHDR_CONTAINS_FD(_cmsghdr) \
( ((_cmsghdr)->cmsg_level == SOL_SOCKET) && \
((_cmsghdr)->cmsg_type == SCM_RIGHTS) )
ssize_t
DaemonSocketPDU::Receive(int aFd)
{
struct iovec iv;
memset(&iv, 0, sizeof(iv));
iv.iov_base = GetData(0);
iv.iov_len = GetAvailableSpace();
uint8_t cmsgbuf[CMSG_SPACE(sizeof(int)* MAX_NFDS)];
struct msghdr msg;
memset(&msg, 0, sizeof(msg));
msg.msg_iov = &iv;
msg.msg_iovlen = 1;
msg.msg_control = cmsgbuf;
msg.msg_controllen = sizeof(cmsgbuf);
ssize_t res = TEMP_FAILURE_RETRY(recvmsg(aFd, &msg, MSG_NOSIGNAL));
if (res < 0) {
MOZ_ASSERT(errno != EBADF); /* internal error */
OnError("recvmsg", errno);
return -1;
}
if (msg.msg_flags & (MSG_CTRUNC | MSG_OOB | MSG_ERRQUEUE)) {
return -1;
}
SetRange(0, res);
struct cmsghdr* chdr = CMSG_FIRSTHDR(&msg);
for (; chdr; chdr = CMSG_NXTHDR(&msg, chdr)) {
if (NS_WARN_IF(!CMSGHDR_CONTAINS_FD(chdr))) {
continue;
}
// Retrieve sent file descriptors.
size_t fdCount = (chdr->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) / sizeof(int);
for (size_t i = 0; i < fdCount; i++) {
int* receivedFd = static_cast<int*>(CMSG_DATA(chdr)) + i;
mReceivedFds.AppendElement(*receivedFd);
}
}
return res;
}
nsTArray<int>
DaemonSocketPDU::AcquireFds()
{
// Forget all RAII object to avoid closing the fds.
nsTArray<int> fds;
for (auto& fd : mReceivedFds) {
fds.AppendElement(fd.forget());
}
mReceivedFds.Clear();
return fds;
}
nsresult
DaemonSocketPDU::UpdateHeader()
{
size_t len = GetPayloadSize();
if (len >= PDU_MAX_PAYLOAD_LENGTH) {
return NS_ERROR_ILLEGAL_VALUE;
}
uint16_t len16 = static_cast<uint16_t>(len);
memcpy(GetData(PDU_OFF_LENGTH), &len16, sizeof(len16));
return NS_OK;
}
size_t
DaemonSocketPDU::GetPayloadSize() const
{
MOZ_ASSERT(GetSize() >= PDU_HEADER_SIZE);
return GetSize() - PDU_HEADER_SIZE;
}
void
DaemonSocketPDU::OnError(const char* aFunction, int aErrno)
{
CHROMIUM_LOG("%s failed with error %d (%s)",
aFunction, aErrno, strerror(aErrno));
}
}
}
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