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https://github.com/RGBCube/serenity
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ea0a002468
Add the correct header to System.h and add OpenBSD-specific handling of signals and socket process id
154 lines
4 KiB
C++
154 lines
4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibCore/LocalSocket.h>
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#include <LibCore/System.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/socket.h>
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#if defined(__FreeBSD__)
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# include <sys/ucred.h>
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#endif
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#ifndef SOCK_NONBLOCK
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# include <sys/ioctl.h>
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#endif
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namespace Core {
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LocalSocket::LocalSocket(int fd, Object* parent)
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: Socket(Socket::Type::Local, parent)
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{
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// NOTE: This constructor is used by LocalServer::accept(), so the socket is already connected.
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m_connected = true;
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set_fd(fd);
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set_mode(OpenMode::ReadWrite);
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set_error(0);
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}
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LocalSocket::LocalSocket(Object* parent)
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: Socket(Socket::Type::Local, parent)
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{
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#ifdef SOCK_NONBLOCK
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int fd = socket(AF_LOCAL, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
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#else
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int fd = socket(AF_LOCAL, SOCK_STREAM, 0);
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int option = 1;
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ioctl(fd, FIONBIO, &option);
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fcntl(fd, F_SETFD, FD_CLOEXEC);
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#endif
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if (fd < 0) {
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set_error(errno);
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} else {
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set_fd(fd);
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set_mode(OpenMode::ReadWrite);
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set_error(0);
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}
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}
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LocalSocket::~LocalSocket()
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{
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}
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pid_t LocalSocket::peer_pid() const
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{
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#ifdef AK_OS_MACOS
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pid_t pid;
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socklen_t pid_size = sizeof(pid);
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#elif defined(__FreeBSD__)
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struct xucred creds = {};
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socklen_t creds_size = sizeof(creds);
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#elif defined(__OpenBSD__)
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struct sockpeercred creds = {};
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socklen_t creds_size = sizeof(creds);
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#else
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struct ucred creds = {};
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socklen_t creds_size = sizeof(creds);
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#endif
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#ifdef AK_OS_MACOS
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if (getsockopt(fd(), SOL_LOCAL, LOCAL_PEERPID, &pid, &pid_size) < 0) {
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#elif defined(__FreeBSD__)
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if (getsockopt(fd(), SOL_LOCAL, LOCAL_PEERCRED, &creds, &creds_size) < 0) {
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#else
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if (getsockopt(fd(), SOL_SOCKET, SO_PEERCRED, &creds, &creds_size) < 0) {
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#endif
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dbgln("LocalSocket: getsockopt failed, {}", strerror(errno));
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VERIFY_NOT_REACHED();
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}
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#ifdef AK_OS_MACOS
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return pid;
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#elif defined(__FreeBSD__)
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return creds.cr_pid;
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#else
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return creds.pid;
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#endif
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}
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HashMap<String, int> LocalSocket::s_overtaken_sockets {};
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bool LocalSocket::s_overtaken_sockets_parsed { false };
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void LocalSocket::parse_sockets_from_system_server()
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{
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VERIFY(!s_overtaken_sockets_parsed);
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constexpr auto socket_takeover = "SOCKET_TAKEOVER";
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const char* sockets = getenv(socket_takeover);
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if (!sockets) {
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s_overtaken_sockets_parsed = true;
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return;
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}
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for (auto& socket : StringView(sockets).split_view(' ')) {
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auto params = socket.split_view(':');
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s_overtaken_sockets.set(params[0].to_string(), strtol(params[1].to_string().characters(), nullptr, 10));
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}
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s_overtaken_sockets_parsed = true;
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// We wouldn't want our children to think we're passing
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// them a socket either, so unset the env variable.
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unsetenv(socket_takeover);
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}
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ErrorOr<NonnullRefPtr<LocalSocket>> LocalSocket::take_over_accepted_socket_from_system_server(String const& socket_path)
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{
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if (!s_overtaken_sockets_parsed)
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parse_sockets_from_system_server();
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int fd;
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if (socket_path.is_null()) {
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// We want the first (and only) socket.
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VERIFY(s_overtaken_sockets.size() == 1);
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fd = s_overtaken_sockets.begin()->value;
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} else {
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auto it = s_overtaken_sockets.find(socket_path);
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if (it == s_overtaken_sockets.end())
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return Error::from_string_literal("Non-existent socket requested"sv);
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fd = it->value;
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}
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// Sanity check: it has to be a socket.
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auto stat = TRY(Core::System::fstat(fd));
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if (!S_ISSOCK(stat.st_mode))
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return Error::from_string_literal("The fd we got from SystemServer is not a socket"sv);
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auto socket = LocalSocket::construct(fd);
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// It had to be !CLOEXEC for obvious reasons, but we
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// don't need it to be !CLOEXEC anymore, so set the
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// CLOEXEC flag now.
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TRY(Core::System::fcntl(fd, F_SETFD, FD_CLOEXEC));
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return socket;
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}
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}
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