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/*
* Copyright (c) 2020, Maciej Zygmanowski <sppmacd@pm.me>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/GenericLexer.h>
#include <AK/JsonArray.h>
#include <AK/JsonObject.h>
#include <AK/JsonValue.h>
#include <AK/String.h>
#include <AK/Vector.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibCore/ProcessStatisticsReader.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <ctype.h>
#include <stdio.h>
struct OpenFile {
int fd;
int pid;
String type;
String name;
String state;
String full_name;
};
static bool parse_name(StringView name, OpenFile& file)
{
GenericLexer lexer(name);
auto component1 = lexer.consume_until(':');
lexer.ignore();
if (lexer.tell_remaining() == 0) {
file.name = component1;
return true;
} else {
file.type = component1;
auto component2 = lexer.consume_while([](char c) { return isprint(c) && c != '('; });
lexer.ignore_while(isspace);
file.name = component2;
if (lexer.tell_remaining() == 0) {
return true;
} else {
if (!lexer.consume_specific('(')) {
dbgln("parse_name: expected (");
return false;
}
auto component3 = lexer.consume_until(')');
lexer.ignore();
if (lexer.tell_remaining() != 0) {
dbgln("parse_name: expected EOF");
return false;
}
file.state = component3;
return true;
}
}
}
static Vector<OpenFile> get_open_files_by_pid(pid_t pid)
{
auto file = Core::File::open(String::formatted("/proc/{}/fds", pid), Core::OpenMode::ReadOnly);
if (file.is_error()) {
outln("lsof: PID {}: {}", pid, file.error());
return Vector<OpenFile>();
}
auto data = file.value()->read_all();
auto json_or_error = JsonValue::from_string(data);
if (json_or_error.is_error()) {
outln("lsof: {}", json_or_error.error());
return Vector<OpenFile>();
}
auto json = json_or_error.release_value();
Vector<OpenFile> files;
json.as_array().for_each([pid, &files](const JsonValue& object) {
OpenFile open_file;
open_file.pid = pid;
open_file.fd = object.as_object().get("fd").to_int();
String name = object.as_object().get("absolute_path").to_string();
VERIFY(parse_name(name, open_file));
open_file.full_name = name;
files.append(open_file);
});
return files;
}
static void display_entry(const OpenFile& file, const Core::ProcessStatistics& statistics)
{
outln("{:28} {:>4} {:>4} {:10} {:>4} {}", statistics.name, file.pid, statistics.pgid, statistics.username, file.fd, file.full_name);
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio rpath proc"));
TRY(Core::System::unveil("/proc", "r"));
// needed by ProcessStatisticsReader::get_all()
TRY(Core::System::unveil("/etc/passwd", "r"));
TRY(Core::System::unveil(nullptr, nullptr));
bool arg_all_processes { false };
int arg_fd { -1 };
StringView arg_uid;
int arg_uid_int = -1;
int arg_pgid { -1 };
pid_t arg_pid { -1 };
StringView arg_filename;
if (arguments.strings.size() == 1)
arg_all_processes = true;
else {
Core::ArgsParser parser;
parser.set_general_help("List open files of a processes. This can mean actual files in the file system, sockets, pipes, etc.");
parser.add_option(arg_pid, "Select by PID", nullptr, 'p', "pid");
parser.add_option(arg_fd, "Select by file descriptor", nullptr, 'd', "fd");
parser.add_option(arg_uid, "Select by login/UID", nullptr, 'u', "login/UID");
parser.add_option(arg_pgid, "Select by process group ID", nullptr, 'g', "PGID");
parser.add_positional_argument(arg_filename, "Filename", "filename", Core::ArgsParser::Required::No);
parser.parse(arguments);
}
{
// try convert UID to int
auto arg = String(arg_uid).to_int();
if (arg.has_value())
arg_uid_int = arg.value();
}
outln("{:28} {:>4} {:>4} {:10} {:>4} {}", "COMMAND", "PID", "PGID", "USER", "FD", "NAME");
auto all_processes = Core::ProcessStatisticsReader::get_all();
if (!all_processes.has_value())
return 1;
if (arg_pid == -1) {
for (auto& process : all_processes.value().processes) {
if (process.pid == 0)
continue;
auto open_files = get_open_files_by_pid(process.pid);
if (open_files.is_empty())
continue;
for (auto& file : open_files) {
if ((arg_all_processes)
|| (arg_fd != -1 && file.fd == arg_fd)
|| (arg_uid_int != -1 && (int)process.uid == arg_uid_int)
|| (!arg_uid.is_empty() && process.username == arg_uid)
|| (arg_pgid != -1 && (int)process.pgid == arg_pgid)
|| (!arg_filename.is_empty() && file.name == arg_filename))
display_entry(file, process);
}
}
} else {
auto open_files = get_open_files_by_pid(arg_pid);
if (open_files.is_empty())
return 0;
for (auto& file : open_files) {
display_entry(file, *all_processes->processes.find_if([&](auto& entry) { return entry.pid == arg_pid; }));
}
}
return 0;
}
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