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89d9a1afc0
This functionality is required by Core::LocalServer and LibIPC depends on LibCore. take_over_accepted_socket_from_system_server has also been renamed to take_over_socket_from_system_server as the socket need not be accepted before taking it over. :^)
70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
/*
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* Copyright (c) 2022, sin-ack <sin-ack@protonmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "SystemServerTakeover.h"
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#include <LibCore/System.h>
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namespace Core {
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HashMap<String, int> s_overtaken_sockets {};
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bool s_overtaken_sockets_parsed { false };
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static void 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<NonnullOwnPtr<Core::Stream::LocalSocket>> take_over_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 = TRY(Core::Stream::LocalSocket::adopt_fd(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(socket->set_close_on_exec(true));
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return socket;
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}
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}
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