Dan Field
6e23c3b3cb
mDNS queries (and many other local queries) should be allowed to set their TTL to 255. This patch enables that on all platforms. On macOS in particular, a system service reserves the mDNS port. The socket option SO_REUSEPORT is required in addition to SO_REUSEADDR to successfully bind there; the flag is also supported on Linux, so this patch allows it to be used there as well (but prints an error message if it's used on any other platform). I could use some guidance as to tests for this - is it support availble for running tests only on specific platforms? Bug: https://github.com/dart-lang/sdk/issues/34799 and Change-Id: I29b620d8ec04343f356a8171bae3d385ddfa9564 https://github.com/dart-lang/sdk/issues/34782 Reviewed-on: https://dart-review.googlesource.com/c/80082 Commit-Queue: Siva Annamalai <asiva@google.com> Reviewed-by: Siva Annamalai <asiva@google.com>
246 lines
8.4 KiB
C++
246 lines
8.4 KiB
C++
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "platform/globals.h"
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#if defined(HOST_OS_FUCHSIA)
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#include "bin/socket.h"
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#include <errno.h> // NOLINT
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#include "bin/eventhandler.h"
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#include "bin/fdutils.h"
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#include "platform/signal_blocker.h"
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// #define SOCKET_LOG_INFO 1
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// #define SOCKET_LOG_ERROR 1
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// define SOCKET_LOG_ERROR to get log messages only for errors.
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// define SOCKET_LOG_INFO to get log messages for both information and errors.
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#if defined(SOCKET_LOG_INFO) || defined(SOCKET_LOG_ERROR)
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#define LOG_ERR(msg, ...) \
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{ \
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int err = errno; \
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Log::PrintErr("Dart Socket ERROR: %s:%d: " msg, __FILE__, __LINE__, \
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##__VA_ARGS__); \
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errno = err; \
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}
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#if defined(SOCKET_LOG_INFO)
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#define LOG_INFO(msg, ...) \
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Log::Print("Dart Socket INFO: %s:%d: " msg, __FILE__, __LINE__, ##__VA_ARGS__)
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#else
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#define LOG_INFO(msg, ...)
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#endif // defined(SOCKET_LOG_INFO)
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#else
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#define LOG_ERR(msg, ...)
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#define LOG_INFO(msg, ...)
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#endif // defined(SOCKET_LOG_INFO) || defined(SOCKET_LOG_ERROR)
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namespace dart {
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namespace bin {
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Socket::Socket(intptr_t fd)
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: ReferenceCounted(),
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fd_(fd),
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isolate_port_(Dart_GetMainPortId()),
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port_(ILLEGAL_PORT),
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udp_receive_buffer_(NULL) {}
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void Socket::SetClosedFd() {
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ASSERT(fd_ != kClosedFd);
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IOHandle* handle = reinterpret_cast<IOHandle*>(fd_);
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ASSERT(handle != NULL);
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handle->Release();
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fd_ = kClosedFd;
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}
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static intptr_t Create(const RawAddr& addr) {
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LOG_INFO("Create: calling socket(SOCK_STREAM)\n");
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intptr_t fd = NO_RETRY_EXPECTED(socket(addr.ss.ss_family, SOCK_STREAM, 0));
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if (fd < 0) {
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LOG_ERR("Create: socket(SOCK_STREAM) failed\n");
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return -1;
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}
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LOG_INFO("Create: socket(SOCK_STREAM) -> fd %ld\n", fd);
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if (!FDUtils::SetCloseOnExec(fd)) {
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LOG_ERR("Create: FDUtils::SetCloseOnExec(%ld) failed\n", fd);
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FDUtils::SaveErrorAndClose(fd);
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return -1;
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}
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IOHandle* io_handle = new IOHandle(fd);
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return reinterpret_cast<intptr_t>(io_handle);
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}
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static intptr_t Connect(intptr_t fd, const RawAddr& addr) {
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IOHandle* handle = reinterpret_cast<IOHandle*>(fd);
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LOG_INFO("Connect: calling connect(%ld)\n", handle->fd());
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intptr_t result = NO_RETRY_EXPECTED(
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connect(handle->fd(), &addr.addr, SocketAddress::GetAddrLength(addr)));
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if ((result == 0) || (errno == EINPROGRESS)) {
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return reinterpret_cast<intptr_t>(handle);
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}
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LOG_ERR("Connect: connect(%ld) failed\n", handle->fd());
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FDUtils::SaveErrorAndClose(handle->fd());
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handle->Release();
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return -1;
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}
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intptr_t Socket::CreateConnect(const RawAddr& addr) {
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intptr_t fd = Create(addr);
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if (fd < 0) {
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return fd;
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}
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IOHandle* handle = reinterpret_cast<IOHandle*>(fd);
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if (!FDUtils::SetNonBlocking(handle->fd())) {
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LOG_ERR("CreateConnect: FDUtils::SetNonBlocking(%ld) failed\n",
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handle->fd());
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FDUtils::SaveErrorAndClose(handle->fd());
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handle->Release();
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return -1;
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}
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return Connect(fd, addr);
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}
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intptr_t Socket::CreateBindConnect(const RawAddr& addr,
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const RawAddr& source_addr) {
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LOG_ERR("SocketBase::CreateBindConnect is unimplemented\n");
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UNIMPLEMENTED();
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return -1;
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}
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intptr_t Socket::CreateBindDatagram(const RawAddr& addr,
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bool reuseAddress,
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bool reusePort,
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int ttl) {
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LOG_ERR("SocketBase::CreateBindDatagram is unimplemented\n");
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UNIMPLEMENTED();
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return -1;
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}
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intptr_t ServerSocket::CreateBindListen(const RawAddr& addr,
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intptr_t backlog,
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bool v6_only) {
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LOG_INFO("ServerSocket::CreateBindListen: calling socket(SOCK_STREAM)\n");
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intptr_t fd = NO_RETRY_EXPECTED(socket(addr.ss.ss_family, SOCK_STREAM, 0));
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if (fd < 0) {
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LOG_ERR("ServerSocket::CreateBindListen: socket() failed\n");
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return -1;
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}
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LOG_INFO("ServerSocket::CreateBindListen: socket(SOCK_STREAM) -> %ld\n", fd);
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if (!FDUtils::SetCloseOnExec(fd)) {
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LOG_ERR("ServerSocket::CreateBindListen: SetCloseOnExec(%ld) failed\n", fd);
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FDUtils::SaveErrorAndClose(fd);
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return -1;
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}
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LOG_INFO("ServerSocket::CreateBindListen: calling setsockopt(%ld)\n", fd);
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int optval = 1;
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VOID_NO_RETRY_EXPECTED(
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setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)));
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if (addr.ss.ss_family == AF_INET6) {
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optval = v6_only ? 1 : 0;
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LOG_INFO("ServerSocket::CreateBindListen: calling setsockopt(%ld)\n", fd);
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VOID_NO_RETRY_EXPECTED(
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setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &optval, sizeof(optval)));
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}
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LOG_INFO("ServerSocket::CreateBindListen: calling bind(%ld)\n", fd);
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if (NO_RETRY_EXPECTED(
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bind(fd, &addr.addr, SocketAddress::GetAddrLength(addr))) < 0) {
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LOG_ERR("ServerSocket::CreateBindListen: bind(%ld) failed\n", fd);
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FDUtils::SaveErrorAndClose(fd);
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return -1;
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}
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LOG_INFO("ServerSocket::CreateBindListen: bind(%ld) succeeded\n", fd);
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IOHandle* io_handle = new IOHandle(fd);
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// Test for invalid socket port 65535 (some browsers disallow it).
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if ((SocketAddress::GetAddrPort(addr) == 0) &&
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(SocketBase::GetPort(reinterpret_cast<intptr_t>(io_handle)) == 65535)) {
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// Don't close the socket until we have created a new socket, ensuring
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// that we do not get the bad port number again.
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intptr_t new_fd = CreateBindListen(addr, backlog, v6_only);
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FDUtils::SaveErrorAndClose(fd);
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io_handle->Release();
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return new_fd;
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}
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LOG_INFO("ServerSocket::CreateBindListen: calling listen(%ld)\n", fd);
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if (NO_RETRY_EXPECTED(listen(fd, backlog > 0 ? backlog : SOMAXCONN)) != 0) {
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LOG_ERR("ServerSocket::CreateBindListen: listen failed(%ld)\n", fd);
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FDUtils::SaveErrorAndClose(fd);
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io_handle->Release();
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return -1;
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}
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LOG_INFO("ServerSocket::CreateBindListen: listen(%ld) succeeded\n", fd);
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if (!FDUtils::SetNonBlocking(fd)) {
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LOG_ERR("CreateBindListen: FDUtils::SetNonBlocking(%ld) failed\n", fd);
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FDUtils::SaveErrorAndClose(fd);
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io_handle->Release();
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return -1;
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}
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return reinterpret_cast<intptr_t>(io_handle);
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}
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bool ServerSocket::StartAccept(intptr_t fd) {
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USE(fd);
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return true;
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}
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static bool IsTemporaryAcceptError(int error) {
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// On Linux a number of protocol errors should be treated as EAGAIN.
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// These are the ones for TCP/IP.
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return (error == EAGAIN) || (error == ENETDOWN) || (error == EPROTO) ||
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(error == ENOPROTOOPT) || (error == EHOSTDOWN) || (error == ENONET) ||
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(error == EHOSTUNREACH) || (error == EOPNOTSUPP) ||
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(error == ENETUNREACH);
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}
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intptr_t ServerSocket::Accept(intptr_t fd) {
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IOHandle* listen_handle = reinterpret_cast<IOHandle*>(fd);
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intptr_t socket;
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struct sockaddr clientaddr;
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socklen_t addrlen = sizeof(clientaddr);
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LOG_INFO("ServerSocket::Accept: calling accept(%ld)\n", listen_fd);
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socket = listen_handle->Accept(&clientaddr, &addrlen);
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if (socket == -1) {
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if (IsTemporaryAcceptError(errno)) {
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// We need to signal to the caller that this is actually not an
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// error. We got woken up from the poll on the listening socket,
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// but there is no connection ready to be accepted.
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ASSERT(kTemporaryFailure != -1);
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socket = kTemporaryFailure;
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} else {
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LOG_ERR("ServerSocket::Accept: accept(%ld) failed\n", listen_fd);
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}
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} else {
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IOHandle* io_handle = new IOHandle(socket);
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LOG_INFO("ServerSocket::Accept: accept(%ld) -> socket %ld\n", listen_fd,
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socket);
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if (!FDUtils::SetCloseOnExec(socket)) {
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LOG_ERR("FDUtils::SetCloseOnExec(%ld) failed\n", socket);
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FDUtils::SaveErrorAndClose(socket);
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io_handle->Release();
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return -1;
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}
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if (!FDUtils::SetNonBlocking(socket)) {
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LOG_ERR("FDUtils::SetNonBlocking(%ld) failed\n", socket);
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FDUtils::SaveErrorAndClose(socket);
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io_handle->Release();
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return -1;
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}
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socket = reinterpret_cast<intptr_t>(io_handle);
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}
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return socket;
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}
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} // namespace bin
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} // namespace dart
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#endif // defined(HOST_OS_FUCHSIA)
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