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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "platform/globals.h"
#if defined(HOST_OS_LINUX)
#include "bin/socket.h"
#include <errno.h> // NOLINT
#include "bin/fdutils.h"
#include "platform/signal_blocker.h"
#include "platform/syslog.h"
#include "platform/utils.h"
namespace dart {
namespace bin {
Socket::Socket(intptr_t fd)
: ReferenceCounted(),
fd_(fd),
isolate_port_(Dart_GetMainPortId()),
port_(ILLEGAL_PORT),
udp_receive_buffer_(NULL) {}
void Socket::CloseFd() {
SetClosedFd();
}
void Socket::SetClosedFd() {
fd_ = kClosedFd;
}
static intptr_t Create(const RawAddr& addr) {
intptr_t fd;
intptr_t type = SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC;
fd = NO_RETRY_EXPECTED(socket(addr.ss.ss_family, type, 0));
if (fd < 0) {
return -1;
}
return fd;
}
static intptr_t Connect(intptr_t fd, const RawAddr& addr) {
intptr_t result = TEMP_FAILURE_RETRY(
connect(fd, &addr.addr, SocketAddress::GetAddrLength(addr)));
if ((result == 0) || (errno == EINPROGRESS)) {
return fd;
}
FDUtils::SaveErrorAndClose(fd);
return -1;
}
intptr_t Socket::CreateConnect(const RawAddr& addr) {
intptr_t fd = Create(addr);
if (fd < 0) {
return fd;
}
return Connect(fd, addr);
}
intptr_t Socket::CreateUnixDomainConnect(const RawAddr& addr) {
intptr_t fd = Create(addr);
if (fd < 0) {
return fd;
}
intptr_t result = TEMP_FAILURE_RETRY(connect(
fd, (struct sockaddr*)&addr.un, SocketAddress::GetAddrLength(addr)));
if (result == 0 || errno == EAGAIN) {
return fd;
}
FDUtils::SaveErrorAndClose(fd);
return -1;
}
intptr_t Socket::CreateBindConnect(const RawAddr& addr,
const RawAddr& source_addr) {
intptr_t fd = Create(addr);
if (fd < 0) {
return fd;
}
intptr_t result = TEMP_FAILURE_RETRY(
bind(fd, &source_addr.addr, SocketAddress::GetAddrLength(source_addr)));
if (result != 0) {
FDUtils::SaveErrorAndClose(fd);
return -1;
}
return Connect(fd, addr);
}
intptr_t Socket::CreateUnixDomainBindConnect(const RawAddr& addr,
const RawAddr& source_addr) {
intptr_t fd = Create(addr);
if (fd < 0) {
return fd;
}
intptr_t result = TEMP_FAILURE_RETRY(
bind(fd, &source_addr.addr, SocketAddress::GetAddrLength(source_addr)));
if (result != 0) {
FDUtils::SaveErrorAndClose(fd);
return -1;
}
result = TEMP_FAILURE_RETRY(connect(fd, (struct sockaddr*)&addr.un,
SocketAddress::GetAddrLength(addr)));
if (result == 0 || errno == EAGAIN) {
return fd;
}
FDUtils::SaveErrorAndClose(fd);
return -1;
}
intptr_t Socket::CreateBindDatagram(const RawAddr& addr,
bool reuseAddress,
bool reusePort,
int ttl) {
intptr_t fd;
fd = NO_RETRY_EXPECTED(socket(addr.addr.sa_family,
SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
IPPROTO_UDP));
if (fd < 0) {
return -1;
}
if (reuseAddress) {
int optval = 1;
VOID_NO_RETRY_EXPECTED(
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)));
}
if (reusePort) {
#ifdef SO_REUSEPORT // Not all Linux versions support this.
int optval = 1;
int reuse_port_success =
setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &optval, sizeof(optval));
// Even if it's defined, we might be running on a kernel
// that doesn't support it at runtime.
if (reuse_port_success != 0) {
if (errno == EINTR) {
FATAL("Unexpected EINTR errno");
}
const int kBufferSize = 1024;
char error_buf[kBufferSize];
Syslog::PrintErr("Dart Socket ERROR: %s:%d: %s.", __FILE__, __LINE__,
Utils::StrError(errno, error_buf, kBufferSize));
}
#else // !defined SO_REUSEPORT
Syslog::PrintErr(
"Dart Socket ERROR: %s:%d: `reusePort` not available on this Linux "
"version.",
__FILE__, __LINE__);
#endif // SO_REUSEPORT
}
if (!SocketBase::SetMulticastHops(fd,
addr.addr.sa_family == AF_INET
? SocketAddress::TYPE_IPV4
: SocketAddress::TYPE_IPV6,
ttl)) {
FDUtils::SaveErrorAndClose(fd);
return -1;
}
if (NO_RETRY_EXPECTED(
bind(fd, &addr.addr, SocketAddress::GetAddrLength(addr))) < 0) {
FDUtils::SaveErrorAndClose(fd);
return -1;
}
return fd;
}
intptr_t ServerSocket::CreateBindListen(const RawAddr& addr,
intptr_t backlog,
bool v6_only) {
intptr_t fd;
fd = NO_RETRY_EXPECTED(
socket(addr.ss.ss_family, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0));
if (fd < 0) {
return -1;
}
int optval = 1;
VOID_NO_RETRY_EXPECTED(
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)));
if (addr.ss.ss_family == AF_INET6) {
optval = v6_only ? 1 : 0;
VOID_NO_RETRY_EXPECTED(
setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &optval, sizeof(optval)));
}
if (NO_RETRY_EXPECTED(
bind(fd, &addr.addr, SocketAddress::GetAddrLength(addr))) < 0) {
FDUtils::SaveErrorAndClose(fd);
return -1;
}
// Test for invalid socket port 65535 (some browsers disallow it).
if ((SocketAddress::GetAddrPort(addr) == 0) &&
(SocketBase::GetPort(fd) == 65535)) {
// Don't close the socket until we have created a new socket, ensuring
// that we do not get the bad port number again.
intptr_t new_fd = CreateBindListen(addr, backlog, v6_only);
FDUtils::SaveErrorAndClose(fd);
return new_fd;
}
if (NO_RETRY_EXPECTED(listen(fd, backlog > 0 ? backlog : SOMAXCONN)) != 0) {
FDUtils::SaveErrorAndClose(fd);
return -1;
}
return fd;
}
intptr_t ServerSocket::CreateUnixDomainBindListen(const RawAddr& addr,
intptr_t backlog) {
intptr_t fd = Create(addr);
if (NO_RETRY_EXPECTED(bind(fd, (struct sockaddr*)&addr.un,
SocketAddress::GetAddrLength(addr))) < 0) {
FDUtils::SaveErrorAndClose(fd);
return -1;
}
if (NO_RETRY_EXPECTED(listen(fd, backlog > 0 ? backlog : SOMAXCONN)) != 0) {
FDUtils::SaveErrorAndClose(fd);
return -1;
}
return fd;
}
bool ServerSocket::StartAccept(intptr_t fd) {
USE(fd);
return true;
}
static bool IsTemporaryAcceptError(int error) {
// On Linux a number of protocol errors should be treated as EAGAIN.
// These are the ones for TCP/IP.
return (error == EAGAIN) || (error == ENETDOWN) || (error == EPROTO) ||
(error == ENOPROTOOPT) || (error == EHOSTDOWN) || (error == ENONET) ||
(error == EHOSTUNREACH) || (error == EOPNOTSUPP) ||
(error == ENETUNREACH);
}
intptr_t ServerSocket::Accept(intptr_t fd) {
intptr_t socket;
struct sockaddr clientaddr;
socklen_t addrlen = sizeof(clientaddr);
socket = TEMP_FAILURE_RETRY(accept(fd, &clientaddr, &addrlen));
if (socket == -1) {
if (IsTemporaryAcceptError(errno)) {
// We need to signal to the caller that this is actually not an
// error. We got woken up from the poll on the listening socket,
// but there is no connection ready to be accepted.
ASSERT(kTemporaryFailure != -1);
socket = kTemporaryFailure;
}
} else {
if (!FDUtils::SetCloseOnExec(socket)) {
FDUtils::SaveErrorAndClose(socket);
return -1;
}
if (!FDUtils::SetNonBlocking(socket)) {
FDUtils::SaveErrorAndClose(socket);
return -1;
}
}
return socket;
}
} // namespace bin
} // namespace dart
#endif // defined(HOST_OS_LINUX)