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Diffstat (limited to 'contrib/llvm-project/lldb/source/Host/common/Socket.cpp')
| -rw-r--r-- | contrib/llvm-project/lldb/source/Host/common/Socket.cpp | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Host/common/Socket.cpp b/contrib/llvm-project/lldb/source/Host/common/Socket.cpp new file mode 100644 index 000000000000..f9911cf136cb --- /dev/null +++ b/contrib/llvm-project/lldb/source/Host/common/Socket.cpp @@ -0,0 +1,376 @@ +//===-- Socket.cpp --------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "lldb/Host/Socket.h" + +#include "lldb/Host/Config.h" +#include "lldb/Host/Host.h" +#include "lldb/Host/SocketAddress.h" +#include "lldb/Host/common/TCPSocket.h" +#include "lldb/Host/common/UDPSocket.h" +#include "lldb/Utility/LLDBLog.h" +#include "lldb/Utility/Log.h" + +#include "llvm/ADT/STLExtras.h" +#include "llvm/ADT/StringExtras.h" +#include "llvm/Support/Errno.h" +#include "llvm/Support/Error.h" +#include "llvm/Support/Regex.h" +#include "llvm/Support/WindowsError.h" + +#if LLDB_ENABLE_POSIX +#include "lldb/Host/posix/DomainSocket.h" + +#include <arpa/inet.h> +#include <netdb.h> +#include <netinet/in.h> +#include <netinet/tcp.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <unistd.h> +#endif + +#ifdef __linux__ +#include "lldb/Host/linux/AbstractSocket.h" +#endif + +#ifdef __ANDROID__ +#include <arpa/inet.h> +#include <asm-generic/errno-base.h> +#include <cerrno> +#include <fcntl.h> +#include <linux/tcp.h> +#include <sys/syscall.h> +#include <unistd.h> +#endif // __ANDROID__ + +using namespace lldb; +using namespace lldb_private; + +#if defined(_WIN32) +typedef const char *set_socket_option_arg_type; +typedef char *get_socket_option_arg_type; +const NativeSocket Socket::kInvalidSocketValue = INVALID_SOCKET; +#else // #if defined(_WIN32) +typedef const void *set_socket_option_arg_type; +typedef void *get_socket_option_arg_type; +const NativeSocket Socket::kInvalidSocketValue = -1; +#endif // #if defined(_WIN32) + +static bool IsInterrupted() { +#if defined(_WIN32) + return ::WSAGetLastError() == WSAEINTR; +#else + return errno == EINTR; +#endif +} + +Socket::Socket(SocketProtocol protocol, bool should_close, + bool child_processes_inherit) + : IOObject(eFDTypeSocket), m_protocol(protocol), + m_socket(kInvalidSocketValue), + m_child_processes_inherit(child_processes_inherit), + m_should_close_fd(should_close) {} + +Socket::~Socket() { Close(); } + +llvm::Error Socket::Initialize() { +#if defined(_WIN32) + auto wVersion = WINSOCK_VERSION; + WSADATA wsaData; + int err = ::WSAStartup(wVersion, &wsaData); + if (err == 0) { + if (wsaData.wVersion < wVersion) { + WSACleanup(); + return llvm::createStringError("WSASock version is not expected."); + } + } else { + return llvm::errorCodeToError(llvm::mapWindowsError(::WSAGetLastError())); + } +#endif + + return llvm::Error::success(); +} + +void Socket::Terminate() { +#if defined(_WIN32) + ::WSACleanup(); +#endif +} + +std::unique_ptr<Socket> Socket::Create(const SocketProtocol protocol, + bool child_processes_inherit, + Status &error) { + error.Clear(); + + std::unique_ptr<Socket> socket_up; + switch (protocol) { + case ProtocolTcp: + socket_up = + std::make_unique<TCPSocket>(true, child_processes_inherit); + break; + case ProtocolUdp: + socket_up = + std::make_unique<UDPSocket>(true, child_processes_inherit); + break; + case ProtocolUnixDomain: +#if LLDB_ENABLE_POSIX + socket_up = + std::make_unique<DomainSocket>(true, child_processes_inherit); +#else + error.SetErrorString( + "Unix domain sockets are not supported on this platform."); +#endif + break; + case ProtocolUnixAbstract: +#ifdef __linux__ + socket_up = + std::make_unique<AbstractSocket>(child_processes_inherit); +#else + error.SetErrorString( + "Abstract domain sockets are not supported on this platform."); +#endif + break; + } + + if (error.Fail()) + socket_up.reset(); + + return socket_up; +} + +llvm::Expected<std::unique_ptr<Socket>> +Socket::TcpConnect(llvm::StringRef host_and_port, + bool child_processes_inherit) { + Log *log = GetLog(LLDBLog::Connection); + LLDB_LOG(log, "host_and_port = {0}", host_and_port); + + Status error; + std::unique_ptr<Socket> connect_socket( + Create(ProtocolTcp, child_processes_inherit, error)); + if (error.Fail()) + return error.ToError(); + + error = connect_socket->Connect(host_and_port); + if (error.Success()) + return std::move(connect_socket); + + return error.ToError(); +} + +llvm::Expected<std::unique_ptr<TCPSocket>> +Socket::TcpListen(llvm::StringRef host_and_port, bool child_processes_inherit, + int backlog) { + Log *log = GetLog(LLDBLog::Connection); + LLDB_LOG(log, "host_and_port = {0}", host_and_port); + + std::unique_ptr<TCPSocket> listen_socket( + new TCPSocket(true, child_processes_inherit)); + + Status error = listen_socket->Listen(host_and_port, backlog); + if (error.Fail()) + return error.ToError(); + + return std::move(listen_socket); +} + +llvm::Expected<std::unique_ptr<UDPSocket>> +Socket::UdpConnect(llvm::StringRef host_and_port, + bool child_processes_inherit) { + return UDPSocket::Connect(host_and_port, child_processes_inherit); +} + +llvm::Expected<Socket::HostAndPort> Socket::DecodeHostAndPort(llvm::StringRef host_and_port) { + static llvm::Regex g_regex("([^:]+|\\[[0-9a-fA-F:]+.*\\]):([0-9]+)"); + HostAndPort ret; + llvm::SmallVector<llvm::StringRef, 3> matches; + if (g_regex.match(host_and_port, &matches)) { + ret.hostname = matches[1].str(); + // IPv6 addresses are wrapped in [] when specified with ports + if (ret.hostname.front() == '[' && ret.hostname.back() == ']') + ret.hostname = ret.hostname.substr(1, ret.hostname.size() - 2); + if (to_integer(matches[2], ret.port, 10)) + return ret; + } else { + // If this was unsuccessful, then check if it's simply an unsigned 16-bit + // integer, representing a port with an empty host. + if (to_integer(host_and_port, ret.port, 10)) + return ret; + } + + return llvm::createStringError(llvm::inconvertibleErrorCode(), + "invalid host:port specification: '%s'", + host_and_port.str().c_str()); +} + +IOObject::WaitableHandle Socket::GetWaitableHandle() { + // TODO: On Windows, use WSAEventSelect + return m_socket; +} + +Status Socket::Read(void *buf, size_t &num_bytes) { + Status error; + int bytes_received = 0; + do { + bytes_received = ::recv(m_socket, static_cast<char *>(buf), num_bytes, 0); + } while (bytes_received < 0 && IsInterrupted()); + + if (bytes_received < 0) { + SetLastError(error); + num_bytes = 0; + } else + num_bytes = bytes_received; + + Log *log = GetLog(LLDBLog::Communication); + if (log) { + LLDB_LOGF(log, + "%p Socket::Read() (socket = %" PRIu64 + ", src = %p, src_len = %" PRIu64 ", flags = 0) => %" PRIi64 + " (error = %s)", + static_cast<void *>(this), static_cast<uint64_t>(m_socket), buf, + static_cast<uint64_t>(num_bytes), + static_cast<int64_t>(bytes_received), error.AsCString()); + } + + return error; +} + +Status Socket::Write(const void *buf, size_t &num_bytes) { + const size_t src_len = num_bytes; + Status error; + int bytes_sent = 0; + do { + bytes_sent = Send(buf, num_bytes); + } while (bytes_sent < 0 && IsInterrupted()); + + if (bytes_sent < 0) { + SetLastError(error); + num_bytes = 0; + } else + num_bytes = bytes_sent; + + Log *log = GetLog(LLDBLog::Communication); + if (log) { + LLDB_LOGF(log, + "%p Socket::Write() (socket = %" PRIu64 + ", src = %p, src_len = %" PRIu64 ", flags = 0) => %" PRIi64 + " (error = %s)", + static_cast<void *>(this), static_cast<uint64_t>(m_socket), buf, + static_cast<uint64_t>(src_len), + static_cast<int64_t>(bytes_sent), error.AsCString()); + } + + return error; +} + +Status Socket::Close() { + Status error; + if (!IsValid() || !m_should_close_fd) + return error; + + Log *log = GetLog(LLDBLog::Connection); + LLDB_LOGF(log, "%p Socket::Close (fd = %" PRIu64 ")", + static_cast<void *>(this), static_cast<uint64_t>(m_socket)); + +#if defined(_WIN32) + bool success = closesocket(m_socket) == 0; +#else + bool success = ::close(m_socket) == 0; +#endif + // A reference to a FD was passed in, set it to an invalid value + m_socket = kInvalidSocketValue; + if (!success) { + SetLastError(error); + } + + return error; +} + +int Socket::GetOption(int level, int option_name, int &option_value) { + get_socket_option_arg_type option_value_p = + reinterpret_cast<get_socket_option_arg_type>(&option_value); + socklen_t option_value_size = sizeof(int); + return ::getsockopt(m_socket, level, option_name, option_value_p, + &option_value_size); +} + +int Socket::SetOption(int level, int option_name, int option_value) { + set_socket_option_arg_type option_value_p = + reinterpret_cast<get_socket_option_arg_type>(&option_value); + return ::setsockopt(m_socket, level, option_name, option_value_p, + sizeof(option_value)); +} + +size_t Socket::Send(const void *buf, const size_t num_bytes) { + return ::send(m_socket, static_cast<const char *>(buf), num_bytes, 0); +} + +void Socket::SetLastError(Status &error) { +#if defined(_WIN32) + error.SetError(::WSAGetLastError(), lldb::eErrorTypeWin32); +#else + error.SetErrorToErrno(); +#endif +} + +NativeSocket Socket::CreateSocket(const int domain, const int type, + const int protocol, + bool child_processes_inherit, Status &error) { + error.Clear(); + auto socket_type = type; +#ifdef SOCK_CLOEXEC + if (!child_processes_inherit) + socket_type |= SOCK_CLOEXEC; +#endif + auto sock = ::socket(domain, socket_type, protocol); + if (sock == kInvalidSocketValue) + SetLastError(error); + + return sock; +} + +NativeSocket Socket::AcceptSocket(NativeSocket sockfd, struct sockaddr *addr, + socklen_t *addrlen, + bool child_processes_inherit, Status &error) { + error.Clear(); +#if defined(ANDROID_USE_ACCEPT_WORKAROUND) + // Hack: + // This enables static linking lldb-server to an API 21 libc, but still + // having it run on older devices. It is necessary because API 21 libc's + // implementation of accept() uses the accept4 syscall(), which is not + // available in older kernels. Using an older libc would fix this issue, but + // introduce other ones, as the old libraries were quite buggy. + int fd = syscall(__NR_accept, sockfd, addr, addrlen); + if (fd >= 0 && !child_processes_inherit) { + int flags = ::fcntl(fd, F_GETFD); + if (flags != -1 && ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC) != -1) + return fd; + SetLastError(error); + close(fd); + } + return fd; +#elif defined(SOCK_CLOEXEC) && defined(HAVE_ACCEPT4) + int flags = 0; + if (!child_processes_inherit) { + flags |= SOCK_CLOEXEC; + } + NativeSocket fd = llvm::sys::RetryAfterSignal( + static_cast<NativeSocket>(-1), ::accept4, sockfd, addr, addrlen, flags); +#else + NativeSocket fd = llvm::sys::RetryAfterSignal( + static_cast<NativeSocket>(-1), ::accept, sockfd, addr, addrlen); +#endif + if (fd == kInvalidSocketValue) + SetLastError(error); + return fd; +} + +llvm::raw_ostream &lldb_private::operator<<(llvm::raw_ostream &OS, + const Socket::HostAndPort &HP) { + return OS << '[' << HP.hostname << ']' << ':' << HP.port; +} |