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ed4c2f2f8e
This generally seems like a better name, especially if we somehow also need a better name for "read the entire buffer, but not the entire file" somewhere down the line.
78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
/*
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* Copyright (c) 2020-2021, 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 <AK/Assertions.h>
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#include <AK/ByteBuffer.h>
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#include <AK/JsonObject.h>
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#include <AK/JsonValue.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/DateTime.h>
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#include <LibCore/Stream.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <unistd.h>
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio wpath cpath"));
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TRY(Core::System::unveil("/var/run/utmp", "rwc"));
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TRY(Core::System::unveil(nullptr, nullptr));
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pid_t pid = 0;
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bool flag_create = false;
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bool flag_delete = false;
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StringView tty_name;
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StringView from;
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Core::ArgsParser args_parser;
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args_parser.add_option(flag_create, "Create entry", "create", 'c');
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args_parser.add_option(flag_delete, "Delete entry", "delete", 'd');
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args_parser.add_option(pid, "PID", "PID", 'p', "PID");
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args_parser.add_option(from, "From", "from", 'f', "From");
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args_parser.add_positional_argument(tty_name, "TTY name", "tty");
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args_parser.parse(arguments);
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if (flag_create && flag_delete) {
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warnln("-c and -d are mutually exclusive");
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return 1;
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}
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dbgln("Updating utmp from UID={} GID={} EGID={} PID={}", getuid(), getgid(), getegid(), pid);
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auto file = TRY(Core::Stream::File::open("/var/run/utmp"sv, Core::Stream::OpenMode::ReadWrite));
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auto file_contents = TRY(file->read_until_eof());
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auto previous_json = TRY(JsonValue::from_string(file_contents));
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JsonObject json;
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if (!file_contents.is_empty()) {
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if (!previous_json.is_object()) {
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dbgln("Error: Could not parse JSON");
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} else {
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json = previous_json.as_object();
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}
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}
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if (flag_create) {
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JsonObject entry;
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entry.set("pid", pid);
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entry.set("uid", getuid());
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entry.set("from", from);
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entry.set("login_at", time(nullptr));
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json.set(tty_name, move(entry));
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} else {
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VERIFY(flag_delete);
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dbgln("Removing {} from utmp", tty_name);
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json.remove(tty_name);
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}
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TRY(file->seek(0, Core::Stream::SeekMode::SetPosition));
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TRY(file->truncate(0));
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TRY(file->write(json.to_deprecated_string().bytes()));
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return 0;
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}
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