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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 "DaemonSocketConnector.h"
#include <fcntl.h>
#include <limits.h>
#include <stddef.h>
#include <string.h>
#include <sys/un.h>
#include "nsISupportsImpl.h" // for MOZ_COUNT_CTOR, MOZ_COUNT_DTOR
#include "prrng.h"
#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 {
nsresult
DaemonSocketConnector::CreateRandomAddressString(
const nsACString& aPrefix, unsigned long aPostfixLength,
nsACString& aAddress)
{
static const char sHexChar[16] = {
[0x0] = '0', [0x1] = '1', [0x2] = '2', [0x3] = '3',
[0x4] = '4', [0x5] = '5', [0x6] = '6', [0x7] = '7',
[0x8] = '8', [0x9] = '9', [0xa] = 'a', [0xb] = 'b',
[0xc] = 'c', [0xd] = 'd', [0xe] = 'e', [0xf] = 'f'
};
unsigned short seed[3];
if (NS_WARN_IF(!PR_GetRandomNoise(seed, sizeof(seed)))) {
return NS_ERROR_NOT_IMPLEMENTED;
}
aAddress = aPrefix;
aAddress.Append('-');
while (aPostfixLength) {
// Android doesn't provide rand_r, so we use nrand48 here,
// even though it's deprecated.
long value = nrand48(seed);
size_t bits = sizeof(value) * CHAR_BIT;
while ((bits > 4) && aPostfixLength) {
aAddress.Append(sHexChar[value&0xf]);
bits -= 4;
value >>= 4;
--aPostfixLength;
}
}
return NS_OK;
}
DaemonSocketConnector::DaemonSocketConnector(const nsACString& aSocketName)
: mSocketName(aSocketName)
{
MOZ_COUNT_CTOR_INHERITED(DaemonSocketConnector, UnixSocketConnector);
}
DaemonSocketConnector::~DaemonSocketConnector()
{
MOZ_COUNT_CTOR_INHERITED(DaemonSocketConnector, UnixSocketConnector);
}
nsresult
DaemonSocketConnector::CreateSocket(int& aFd) const
{
aFd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
if (aFd < 0) {
CHROMIUM_LOG("Could not open daemon socket!");
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult
DaemonSocketConnector::SetSocketFlags(int aFd) const
{
static const int sReuseAddress = 1;
// Set close-on-exec bit.
int flags = TEMP_FAILURE_RETRY(fcntl(aFd, F_GETFD));
if (flags < 0) {
return NS_ERROR_FAILURE;
}
flags |= FD_CLOEXEC;
int res = TEMP_FAILURE_RETRY(fcntl(aFd, F_SETFD, flags));
if (res < 0) {
return NS_ERROR_FAILURE;
}
// Set non-blocking status flag.
flags = TEMP_FAILURE_RETRY(fcntl(aFd, F_GETFL));
if (flags < 0) {
return NS_ERROR_FAILURE;
}
flags |= O_NONBLOCK;
res = TEMP_FAILURE_RETRY(fcntl(aFd, F_SETFL, flags));
if (res < 0) {
return NS_ERROR_FAILURE;
}
// Set socket addr to be reused even if kernel is still waiting to close.
res = setsockopt(aFd, SOL_SOCKET, SO_REUSEADDR, &sReuseAddress,
sizeof(sReuseAddress));
if (res < 0) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult
DaemonSocketConnector::CreateAddress(struct sockaddr& aAddress,
socklen_t& aAddressLength) const
{
static const size_t sNameOffset = 1;
struct sockaddr_un* address =
reinterpret_cast<struct sockaddr_un*>(&aAddress);
size_t namesiz = mSocketName.Length() + 1; // include trailing '\0'
if (NS_WARN_IF((sNameOffset + namesiz) > sizeof(address->sun_path))) {
return NS_ERROR_FAILURE;
}
address->sun_family = AF_UNIX;
memset(address->sun_path, '\0', sNameOffset); // abstract socket
memcpy(address->sun_path + sNameOffset, mSocketName.get(), namesiz);
aAddressLength =
offsetof(struct sockaddr_un, sun_path) + sNameOffset + namesiz;
return NS_OK;
}
// |UnixSocketConnector|
nsresult
DaemonSocketConnector::ConvertAddressToString(
const struct sockaddr& aAddress, socklen_t aAddressLength,
nsACString& aAddressString)
{
MOZ_ASSERT(aAddress.sa_family == AF_UNIX);
const struct sockaddr_un* un =
reinterpret_cast<const struct sockaddr_un*>(&aAddress);
size_t len = aAddressLength - offsetof(struct sockaddr_un, sun_path);
aAddressString.Assign(un->sun_path, len);
return NS_OK;
}
nsresult
DaemonSocketConnector::CreateListenSocket(struct sockaddr* aAddress,
socklen_t* aAddressLength,
int& aListenFd)
{
ScopedClose fd;
nsresult rv = CreateSocket(fd.rwget());
if (NS_FAILED(rv)) {
return rv;
}
rv = SetSocketFlags(fd);
if (NS_FAILED(rv)) {
return rv;
}
if (aAddress && aAddressLength) {
rv = CreateAddress(*aAddress, *aAddressLength);
if (NS_FAILED(rv)) {
return rv;
}
}
aListenFd = fd.forget();
return NS_OK;
}
nsresult
DaemonSocketConnector::AcceptStreamSocket(int aListenFd,
struct sockaddr* aAddress,
socklen_t* aAddressLength,
int& aStreamFd)
{
ScopedClose fd(
TEMP_FAILURE_RETRY(accept(aListenFd, aAddress, aAddressLength)));
if (fd < 0) {
CHROMIUM_LOG("Cannot accept file descriptor!");
return NS_ERROR_FAILURE;
}
nsresult rv = SetSocketFlags(fd);
if (NS_FAILED(rv)) {
return rv;
}
aStreamFd = fd.forget();
return NS_OK;
}
nsresult
DaemonSocketConnector::CreateStreamSocket(struct sockaddr* aAddress,
socklen_t* aAddressLength,
int& aStreamFd)
{
MOZ_CRASH("|DaemonSocketConnector| does not support "
"creating stream sockets.");
return NS_ERROR_ABORT;
}
nsresult
DaemonSocketConnector::Duplicate(UnixSocketConnector*& aConnector)
{
aConnector = new DaemonSocketConnector(*this);
return NS_OK;
}
} // namespace ipc
} // namespace mozilla
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