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