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- /*
- * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this
- * list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- #include <AK/ByteBuffer.h>
- #include <AK/JsonObject.h>
- #include <AK/JsonValue.h>
- #include <LibCore/ArgsParser.h>
- #include <LibCore/DateTime.h>
- #include <LibCore/File.h>
- int main(int argc, char** argv)
- {
- if (pledge("stdio wpath cpath", nullptr) < 0) {
- perror("pledge");
- return 1;
- }
- if (unveil("/var/run/utmp", "rwc") < 0) {
- perror("unveil");
- return 1;
- }
- unveil(nullptr, nullptr);
- pid_t pid = 0;
- bool flag_create = false;
- bool flag_delete = false;
- const char* tty_name = nullptr;
- const char* from = nullptr;
- Core::ArgsParser args_parser;
- args_parser.add_option(flag_create, "Create entry", "create", 'c');
- args_parser.add_option(flag_delete, "Delete entry", "delete", 'd');
- args_parser.add_option(pid, "PID", "PID", 'p', "PID");
- args_parser.add_option(from, "From", "from", 'f', "From");
- args_parser.add_positional_argument(tty_name, "TTY name", "tty");
- args_parser.parse(argc, argv);
- if (flag_create && flag_delete) {
- warnln("-c and -d are mutually exclusive");
- return 1;
- }
- dbg() << "Updating utmp from UID=" << getuid() << " GID=" << getgid() << " EGID=" << getegid() << " PID=" << pid;
- auto file_or_error = Core::File::open("/var/run/utmp", Core::IODevice::ReadWrite);
- if (file_or_error.is_error()) {
- dbg() << "Error: " << file_or_error.error();
- return 1;
- }
- auto& file = *file_or_error.value();
- auto file_contents = file.read_all();
- auto previous_json = JsonValue::from_string(file_contents);
- JsonObject json;
- if (!previous_json.has_value() || !previous_json.value().is_object()) {
- dbg() << "Error: Could not parse JSON";
- } else {
- json = previous_json.value().as_object();
- }
- if (flag_create) {
- JsonObject entry;
- entry.set("pid", pid);
- entry.set("uid", getuid());
- entry.set("from", from);
- entry.set("login_at", time(nullptr));
- json.set(tty_name, move(entry));
- } else {
- ASSERT(flag_delete);
- dbg() << "Removing " << tty_name << " from utmp";
- json.remove(tty_name);
- }
- if (!file.seek(0)) {
- dbg() << "Seek failed";
- return 1;
- }
- if (!file.truncate(0)) {
- dbg() << "Truncation failed";
- return 1;
- }
- if (!file.write(json.to_string())) {
- dbg() << "Write failed";
- return 1;
- }
- return 0;
- }
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