forked from OSchip/llvm-project
156 lines
4.7 KiB
C++
156 lines
4.7 KiB
C++
//===-- DomainSocket.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/posix/DomainSocket.h"
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#include "llvm/Support/Errno.h"
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#include "llvm/Support/FileSystem.h"
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#include <stddef.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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using namespace lldb;
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using namespace lldb_private;
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#ifdef __ANDROID__
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// Android does not have SUN_LEN
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#ifndef SUN_LEN
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#define SUN_LEN(ptr) \
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(offsetof(struct sockaddr_un, sun_path) + strlen((ptr)->sun_path))
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#endif
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#endif // #ifdef __ANDROID__
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namespace {
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const int kDomain = AF_UNIX;
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const int kType = SOCK_STREAM;
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bool SetSockAddr(llvm::StringRef name, const size_t name_offset,
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sockaddr_un *saddr_un, socklen_t &saddr_un_len) {
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if (name.size() + name_offset > sizeof(saddr_un->sun_path))
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return false;
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memset(saddr_un, 0, sizeof(*saddr_un));
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saddr_un->sun_family = kDomain;
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memcpy(saddr_un->sun_path + name_offset, name.data(), name.size());
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// For domain sockets we can use SUN_LEN in order to calculate size of
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// sockaddr_un, but for abstract sockets we have to calculate size manually
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// because of leading null symbol.
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if (name_offset == 0)
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saddr_un_len = SUN_LEN(saddr_un);
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else
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saddr_un_len =
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offsetof(struct sockaddr_un, sun_path) + name_offset + name.size();
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#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__)
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saddr_un->sun_len = saddr_un_len;
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#endif
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return true;
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}
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} // namespace
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DomainSocket::DomainSocket(bool should_close, bool child_processes_inherit)
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: Socket(ProtocolUnixDomain, should_close, child_processes_inherit) {}
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DomainSocket::DomainSocket(SocketProtocol protocol,
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bool child_processes_inherit)
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: Socket(protocol, true, child_processes_inherit) {}
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DomainSocket::DomainSocket(NativeSocket socket,
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const DomainSocket &listen_socket)
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: Socket(ProtocolUnixDomain, listen_socket.m_should_close_fd,
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listen_socket.m_child_processes_inherit) {
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m_socket = socket;
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}
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Status DomainSocket::Connect(llvm::StringRef name) {
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sockaddr_un saddr_un;
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socklen_t saddr_un_len;
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if (!SetSockAddr(name, GetNameOffset(), &saddr_un, saddr_un_len))
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return Status("Failed to set socket address");
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Status error;
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m_socket = CreateSocket(kDomain, kType, 0, m_child_processes_inherit, error);
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if (error.Fail())
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return error;
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if (llvm::sys::RetryAfterSignal(-1, ::connect, GetNativeSocket(),
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(struct sockaddr *)&saddr_un, saddr_un_len) < 0)
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SetLastError(error);
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return error;
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}
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Status DomainSocket::Listen(llvm::StringRef name, int backlog) {
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sockaddr_un saddr_un;
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socklen_t saddr_un_len;
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if (!SetSockAddr(name, GetNameOffset(), &saddr_un, saddr_un_len))
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return Status("Failed to set socket address");
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DeleteSocketFile(name);
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Status error;
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m_socket = CreateSocket(kDomain, kType, 0, m_child_processes_inherit, error);
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if (error.Fail())
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return error;
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if (::bind(GetNativeSocket(), (struct sockaddr *)&saddr_un, saddr_un_len) ==
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0)
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if (::listen(GetNativeSocket(), backlog) == 0)
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return error;
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SetLastError(error);
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return error;
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}
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Status DomainSocket::Accept(Socket *&socket) {
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Status error;
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auto conn_fd = AcceptSocket(GetNativeSocket(), nullptr, nullptr,
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m_child_processes_inherit, error);
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if (error.Success())
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socket = new DomainSocket(conn_fd, *this);
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return error;
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}
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size_t DomainSocket::GetNameOffset() const { return 0; }
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void DomainSocket::DeleteSocketFile(llvm::StringRef name) {
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llvm::sys::fs::remove(name);
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}
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std::string DomainSocket::GetSocketName() const {
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if (m_socket != kInvalidSocketValue) {
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struct sockaddr_un saddr_un;
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saddr_un.sun_family = AF_UNIX;
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socklen_t sock_addr_len = sizeof(struct sockaddr_un);
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if (::getpeername(m_socket, (struct sockaddr *)&saddr_un, &sock_addr_len) ==
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0) {
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std::string name(saddr_un.sun_path + GetNameOffset(),
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sock_addr_len -
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offsetof(struct sockaddr_un, sun_path) -
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GetNameOffset());
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if (name.back() == '\0') name.pop_back();
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return name;
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}
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}
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return "";
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}
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std::string DomainSocket::GetRemoteConnectionURI() const {
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if (m_socket != kInvalidSocketValue) {
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return std::string(llvm::formatv(
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"{0}://{1}",
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GetNameOffset() == 0 ? "unix-connect" : "unix-abstract-connect",
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GetSocketName()));
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}
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return "";
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}
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