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