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/*
* Copyright (c) 2020, Maciej Zygmanowski <sppmacd@pm.me>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/ByteBuffer.h>
#include <AK/GenericLexer.h>
#include <AK/HashMap.h>
#include <AK/JsonArray.h>
#include <AK/JsonObject.h>
#include <AK/JsonParser.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 <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(':');
if (lexer.tell_remaining() == 0) {
file.name = component1;
return true;
} else {
file.type = component1;
auto component2 = lexer.consume_while([](char c) { return isprint(c) && !isspace(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(')');
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::IODevice::OpenMode::ReadOnly);
if (file.is_error()) {
printf("lsof: PID %d: %s\n", pid, file.error().characters());
return Vector<OpenFile>();
}
auto data = file.value()->read_all();
JsonParser parser(data);
auto result = parser.parse();
if (!result.has_value()) {
VERIFY_NOT_REACHED();
}
Vector<OpenFile> files;
result.value().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)
{
printf("%-28s %4d %4d %-10s %4d %s\n", statistics.name.characters(), file.pid, statistics.pgid, statistics.username.characters(), file.fd, file.full_name.characters());
}
int main(int argc, char* argv[])
{
if (pledge("stdio rpath proc", nullptr) < 0) {
perror("pledge");
return 1;
}
if (unveil("/proc", "r") < 0) {
perror("unveil /proc");
return 1;
}
// needed by ProcessStatisticsReader::get_all()
if (unveil("/etc/passwd", "r") < 0) {
perror("unveil /etc/passwd");
return 1;
}
unveil(nullptr, nullptr);
bool arg_all_processes { false };
int arg_fd { -1 };
const char* arg_uid { nullptr };
int arg_uid_int = -1;
int arg_pgid { -1 };
pid_t arg_pid { -1 };
const char* arg_file_name { nullptr };
if (argc == 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_file_name, "File name", "file name", Core::ArgsParser::Required::No);
parser.parse(argc, argv);
}
{
// try convert UID to int
auto arg = String(arg_uid).to_int();
if (arg.has_value())
arg_uid_int = arg.value();
}
printf("%-28s %4s %4s %-10s %4s %s\n", "COMMAND", "PID", "PGID", "USER", "FD", "NAME");
auto processes = Core::ProcessStatisticsReader::get_all();
if (!processes.has_value())
return 1;
if (arg_pid == -1) {
for (auto process : processes.value()) {
if (process.key == 0)
continue;
auto open_files = get_open_files_by_pid(process.key);
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.value.uid == arg_uid_int)
|| (arg_uid != nullptr && process.value.username == arg_uid)
|| (arg_pgid != -1 && (int)process.value.pgid == arg_pgid)
|| (arg_file_name != nullptr && file.name == arg_file_name))
display_entry(file, process.value);
}
}
} 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, processes.value().get(arg_pid).value());
}
}
return 0;
}
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