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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StringUtils.h>
#include <LibCore/Account.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <alloca.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <unistd.h>
static int print_id_objects(Core::Account const&);
static bool flag_print_uid = false;
static bool flag_print_gid = false;
static bool flag_print_name = false;
static bool flag_print_gid_all = false;
static String user_str;
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::unveil("/etc/passwd", "r"));
TRY(Core::System::unveil("/etc/group", "r"));
TRY(Core::System::unveil(nullptr, nullptr));
TRY(Core::System::pledge("stdio rpath"));
Core::ArgsParser args_parser;
args_parser.add_option(flag_print_uid, "Print UID", nullptr, 'u');
args_parser.add_option(flag_print_gid, "Print GID", nullptr, 'g');
args_parser.add_option(flag_print_gid_all, "Print all GIDs", nullptr, 'G');
args_parser.add_option(flag_print_name, "Print name", nullptr, 'n');
args_parser.add_positional_argument(user_str, "User name/UID to query", "USER", Core::ArgsParser::Required::No);
args_parser.parse(arguments);
if (flag_print_name && !(flag_print_uid || flag_print_gid || flag_print_gid_all)) {
warnln("cannot print only names or real IDs in default format");
return 1;
}
if (flag_print_uid + flag_print_gid + flag_print_gid_all > 1) {
warnln("cannot print \"only\" of more than one choice");
return 1;
}
Optional<Core::Account> account;
if (!user_str.is_empty()) {
if (auto user_id = user_str.to_uint(); user_id.has_value())
account = TRY(Core::Account::from_uid(user_id.value(), Core::Account::Read::PasswdOnly));
else
account = TRY(Core::Account::from_name(user_str, Core::Account::Read::PasswdOnly));
} else {
account = TRY(Core::Account::self(Core::Account::Read::PasswdOnly));
}
return print_id_objects(account.value());
}
static bool print_uid_object(Core::Account const& account)
{
if (flag_print_name)
out("{}", account.username());
else
out("{}", account.uid());
return true;
}
static bool print_gid_object(Core::Account const& account)
{
if (flag_print_name) {
struct group* gr = getgrgid(account.gid());
out("{}", gr ? gr->gr_name : "n/a");
} else
out("{}", account.gid());
return true;
}
static bool print_gid_list(Core::Account const& account)
{
auto& extra_gids = account.extra_gids();
auto extra_gid_count = extra_gids.size();
for (size_t g = 0; g < extra_gid_count; ++g) {
auto gid = extra_gids[g];
auto* gr = getgrgid(gid);
if (flag_print_name && gr)
out("{}", gr->gr_name);
else
out("{}", gid);
if (g != extra_gid_count - 1)
out(" ");
}
return true;
}
static bool print_full_id_list(Core::Account const& account)
{
auto uid = account.uid();
auto gid = account.gid();
struct passwd* pw = getpwuid(uid);
struct group* gr = getgrgid(gid);
out("uid={}({}) gid={}({})", uid, pw ? pw->pw_name : "n/a", gid, gr ? gr->gr_name : "n/a");
for (auto extra_gid : account.extra_gids()) {
auto* gr = getgrgid(extra_gid);
if (gr)
out(" {}({})", extra_gid, gr->gr_name);
else
out(" {}", extra_gid);
}
return true;
}
static int print_id_objects(Core::Account const& account)
{
if (flag_print_uid) {
if (!print_uid_object(account))
return 1;
} else if (flag_print_gid) {
if (!print_gid_object(account))
return 1;
} else if (flag_print_gid_all) {
if (!print_gid_list(account))
return 1;
} else {
if (!print_full_id_list(account))
return 1;
}
outln();
return 0;
}
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