forked from OSchip/llvm-project
381 lines
11 KiB
C++
381 lines
11 KiB
C++
//===-- Socket.cpp --------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Host/Socket.h"
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#include "lldb/Host/Config.h"
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#include "lldb/Host/Host.h"
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#include "lldb/Host/SocketAddress.h"
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#include "lldb/Host/common/TCPSocket.h"
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#include "lldb/Host/common/UDPSocket.h"
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#include "lldb/Utility/Log.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Support/Errno.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/Regex.h"
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#include "llvm/Support/WindowsError.h"
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#if LLDB_ENABLE_POSIX
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#include "lldb/Host/posix/DomainSocket.h"
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#endif
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#ifdef __linux__
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#include "lldb/Host/linux/AbstractSocket.h"
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#endif
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#ifdef __ANDROID__
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#include <arpa/inet.h>
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#include <asm-generic/errno-base.h>
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#include <cerrno>
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#include <fcntl.h>
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#include <linux/tcp.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#endif // __ANDROID__
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using namespace lldb;
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using namespace lldb_private;
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#if defined(_WIN32)
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typedef const char *set_socket_option_arg_type;
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typedef char *get_socket_option_arg_type;
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const NativeSocket Socket::kInvalidSocketValue = INVALID_SOCKET;
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#else // #if defined(_WIN32)
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typedef const void *set_socket_option_arg_type;
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typedef void *get_socket_option_arg_type;
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const NativeSocket Socket::kInvalidSocketValue = -1;
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#endif // #if defined(_WIN32)
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static bool IsInterrupted() {
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#if defined(_WIN32)
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return ::WSAGetLastError() == WSAEINTR;
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#else
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return errno == EINTR;
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#endif
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}
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Socket::Socket(SocketProtocol protocol, bool should_close,
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bool child_processes_inherit)
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: IOObject(eFDTypeSocket), m_protocol(protocol),
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m_socket(kInvalidSocketValue),
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m_child_processes_inherit(child_processes_inherit),
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m_should_close_fd(should_close) {}
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Socket::~Socket() { Close(); }
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llvm::Error Socket::Initialize() {
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#if defined(_WIN32)
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auto wVersion = WINSOCK_VERSION;
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WSADATA wsaData;
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int err = ::WSAStartup(wVersion, &wsaData);
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if (err == 0) {
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if (wsaData.wVersion < wVersion) {
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WSACleanup();
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return llvm::make_error<llvm::StringError>(
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"WSASock version is not expected.", llvm::inconvertibleErrorCode());
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}
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} else {
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return llvm::errorCodeToError(llvm::mapWindowsError(::WSAGetLastError()));
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}
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#endif
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return llvm::Error::success();
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}
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void Socket::Terminate() {
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#if defined(_WIN32)
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::WSACleanup();
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#endif
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}
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std::unique_ptr<Socket> Socket::Create(const SocketProtocol protocol,
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bool child_processes_inherit,
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Status &error) {
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error.Clear();
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std::unique_ptr<Socket> socket_up;
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switch (protocol) {
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case ProtocolTcp:
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socket_up =
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std::make_unique<TCPSocket>(true, child_processes_inherit);
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break;
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case ProtocolUdp:
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socket_up =
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std::make_unique<UDPSocket>(true, child_processes_inherit);
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break;
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case ProtocolUnixDomain:
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#if LLDB_ENABLE_POSIX
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socket_up =
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std::make_unique<DomainSocket>(true, child_processes_inherit);
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#else
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error.SetErrorString(
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"Unix domain sockets are not supported on this platform.");
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#endif
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break;
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case ProtocolUnixAbstract:
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#ifdef __linux__
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socket_up =
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std::make_unique<AbstractSocket>(child_processes_inherit);
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#else
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error.SetErrorString(
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"Abstract domain sockets are not supported on this platform.");
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#endif
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break;
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}
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if (error.Fail())
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socket_up.reset();
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return socket_up;
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}
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llvm::Expected<std::unique_ptr<Socket>>
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Socket::TcpConnect(llvm::StringRef host_and_port,
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bool child_processes_inherit) {
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Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION));
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LLDB_LOG(log, "host_and_port = {0}", host_and_port);
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Status error;
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std::unique_ptr<Socket> connect_socket(
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Create(ProtocolTcp, child_processes_inherit, error));
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if (error.Fail())
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return error.ToError();
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error = connect_socket->Connect(host_and_port);
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if (error.Success())
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return std::move(connect_socket);
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return error.ToError();
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}
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llvm::Expected<std::unique_ptr<TCPSocket>>
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Socket::TcpListen(llvm::StringRef host_and_port, bool child_processes_inherit,
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int backlog) {
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Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION));
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LLDB_LOG(log, "host_and_port = {0}", host_and_port);
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std::unique_ptr<TCPSocket> listen_socket(
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new TCPSocket(true, child_processes_inherit));
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Status error = listen_socket->Listen(host_and_port, backlog);
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if (error.Fail())
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return error.ToError();
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return std::move(listen_socket);
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}
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llvm::Expected<std::unique_ptr<UDPSocket>>
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Socket::UdpConnect(llvm::StringRef host_and_port,
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bool child_processes_inherit) {
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return UDPSocket::Connect(host_and_port, child_processes_inherit);
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}
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llvm::Expected<Socket::HostAndPort> Socket::DecodeHostAndPort(llvm::StringRef host_and_port) {
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static llvm::Regex g_regex("([^:]+|\\[[0-9a-fA-F:]+.*\\]):([0-9]+)");
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HostAndPort ret;
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llvm::SmallVector<llvm::StringRef, 3> matches;
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if (g_regex.match(host_and_port, &matches)) {
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ret.hostname = matches[1].str();
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// IPv6 addresses are wrapped in [] when specified with ports
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if (ret.hostname.front() == '[' && ret.hostname.back() == ']')
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ret.hostname = ret.hostname.substr(1, ret.hostname.size() - 2);
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if (to_integer(matches[2], ret.port, 10))
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return ret;
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} else {
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// If this was unsuccessful, then check if it's simply an unsigned 16-bit
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// integer, representing a port with an empty host.
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if (to_integer(host_and_port, ret.port, 10))
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return ret;
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}
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return llvm::createStringError(llvm::inconvertibleErrorCode(),
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"invalid host:port specification: '%s'",
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host_and_port.str().c_str());
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}
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IOObject::WaitableHandle Socket::GetWaitableHandle() {
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// TODO: On Windows, use WSAEventSelect
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return m_socket;
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}
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Status Socket::Read(void *buf, size_t &num_bytes) {
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Status error;
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int bytes_received = 0;
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do {
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bytes_received = ::recv(m_socket, static_cast<char *>(buf), num_bytes, 0);
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} while (bytes_received < 0 && IsInterrupted());
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if (bytes_received < 0) {
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SetLastError(error);
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num_bytes = 0;
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} else
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num_bytes = bytes_received;
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Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_COMMUNICATION));
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if (log) {
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LLDB_LOGF(log,
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"%p Socket::Read() (socket = %" PRIu64
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", src = %p, src_len = %" PRIu64 ", flags = 0) => %" PRIi64
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" (error = %s)",
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static_cast<void *>(this), static_cast<uint64_t>(m_socket), buf,
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static_cast<uint64_t>(num_bytes),
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static_cast<int64_t>(bytes_received), error.AsCString());
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}
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return error;
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}
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Status Socket::Write(const void *buf, size_t &num_bytes) {
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const size_t src_len = num_bytes;
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Status error;
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int bytes_sent = 0;
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do {
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bytes_sent = Send(buf, num_bytes);
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} while (bytes_sent < 0 && IsInterrupted());
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if (bytes_sent < 0) {
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SetLastError(error);
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num_bytes = 0;
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} else
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num_bytes = bytes_sent;
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Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_COMMUNICATION));
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if (log) {
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LLDB_LOGF(log,
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"%p Socket::Write() (socket = %" PRIu64
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", src = %p, src_len = %" PRIu64 ", flags = 0) => %" PRIi64
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" (error = %s)",
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static_cast<void *>(this), static_cast<uint64_t>(m_socket), buf,
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static_cast<uint64_t>(src_len),
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static_cast<int64_t>(bytes_sent), error.AsCString());
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}
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return error;
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}
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Status Socket::PreDisconnect() {
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Status error;
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return error;
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}
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Status Socket::Close() {
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Status error;
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if (!IsValid() || !m_should_close_fd)
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return error;
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Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION));
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LLDB_LOGF(log, "%p Socket::Close (fd = %" PRIu64 ")",
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static_cast<void *>(this), static_cast<uint64_t>(m_socket));
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#if defined(_WIN32)
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bool success = closesocket(m_socket) == 0;
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#else
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bool success = ::close(m_socket) == 0;
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#endif
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// A reference to a FD was passed in, set it to an invalid value
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m_socket = kInvalidSocketValue;
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if (!success) {
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SetLastError(error);
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}
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return error;
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}
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int Socket::GetOption(int level, int option_name, int &option_value) {
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get_socket_option_arg_type option_value_p =
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reinterpret_cast<get_socket_option_arg_type>(&option_value);
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socklen_t option_value_size = sizeof(int);
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return ::getsockopt(m_socket, level, option_name, option_value_p,
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&option_value_size);
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}
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int Socket::SetOption(int level, int option_name, int option_value) {
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set_socket_option_arg_type option_value_p =
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reinterpret_cast<get_socket_option_arg_type>(&option_value);
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return ::setsockopt(m_socket, level, option_name, option_value_p,
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sizeof(option_value));
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}
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size_t Socket::Send(const void *buf, const size_t num_bytes) {
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return ::send(m_socket, static_cast<const char *>(buf), num_bytes, 0);
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}
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void Socket::SetLastError(Status &error) {
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#if defined(_WIN32)
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error.SetError(::WSAGetLastError(), lldb::eErrorTypeWin32);
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#else
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error.SetErrorToErrno();
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#endif
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}
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NativeSocket Socket::CreateSocket(const int domain, const int type,
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const int protocol,
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bool child_processes_inherit, Status &error) {
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error.Clear();
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auto socket_type = type;
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#ifdef SOCK_CLOEXEC
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if (!child_processes_inherit)
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socket_type |= SOCK_CLOEXEC;
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#endif
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auto sock = ::socket(domain, socket_type, protocol);
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if (sock == kInvalidSocketValue)
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SetLastError(error);
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return sock;
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}
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NativeSocket Socket::AcceptSocket(NativeSocket sockfd, struct sockaddr *addr,
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socklen_t *addrlen,
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bool child_processes_inherit, Status &error) {
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error.Clear();
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#if defined(ANDROID_USE_ACCEPT_WORKAROUND)
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// Hack:
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// This enables static linking lldb-server to an API 21 libc, but still
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// having it run on older devices. It is necessary because API 21 libc's
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// implementation of accept() uses the accept4 syscall(), which is not
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// available in older kernels. Using an older libc would fix this issue, but
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// introduce other ones, as the old libraries were quite buggy.
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int fd = syscall(__NR_accept, sockfd, addr, addrlen);
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if (fd >= 0 && !child_processes_inherit) {
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int flags = ::fcntl(fd, F_GETFD);
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if (flags != -1 && ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC) != -1)
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return fd;
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SetLastError(error);
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close(fd);
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}
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return fd;
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#elif defined(SOCK_CLOEXEC) && defined(HAVE_ACCEPT4)
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int flags = 0;
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if (!child_processes_inherit) {
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flags |= SOCK_CLOEXEC;
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}
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NativeSocket fd = llvm::sys::RetryAfterSignal(
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static_cast<NativeSocket>(-1), ::accept4, sockfd, addr, addrlen, flags);
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#else
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NativeSocket fd = llvm::sys::RetryAfterSignal(
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static_cast<NativeSocket>(-1), ::accept, sockfd, addr, addrlen);
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#endif
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if (fd == kInvalidSocketValue)
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SetLastError(error);
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return fd;
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}
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llvm::raw_ostream &lldb_private::operator<<(llvm::raw_ostream &OS,
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const Socket::HostAndPort &HP) {
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return OS << '[' << HP.hostname << ']' << ':' << HP.port;
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}
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