mirror of
https://github.com/SerenityOS/serenity
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181 lines
5.2 KiB
C++
181 lines
5.2 KiB
C++
/*
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* Copyright (c) 2018-2020, 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 <LibCore/ArgsParser.h>
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#include <alloca.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <unistd.h>
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static int print_id_objects();
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static bool flag_print_uid = false;
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static bool flag_print_gid = false;
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static bool flag_print_name = false;
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static bool flag_print_gid_all = false;
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int main(int argc, char** argv)
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{
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if (unveil("/etc/passwd", "r") < 0) {
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perror("unveil");
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return 1;
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}
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if (unveil("/etc/group", "r") < 0) {
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perror("unveil");
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return 1;
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}
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if (unveil(nullptr, nullptr) < 0) {
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perror("unveil");
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return 1;
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}
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if (pledge("stdio rpath", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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Core::ArgsParser args_parser;
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args_parser.add_option(flag_print_uid, "Print UID", nullptr, 'u');
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args_parser.add_option(flag_print_gid, "Print GID", nullptr, 'g');
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args_parser.add_option(flag_print_gid_all, "Print all GIDs", nullptr, 'G');
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args_parser.add_option(flag_print_name, "Print name", nullptr, 'n');
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args_parser.parse(argc, argv);
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if (flag_print_name && !(flag_print_uid || flag_print_gid || flag_print_gid_all)) {
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fprintf(stderr, "cannot print only names or real IDs in default format\n");
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return 1;
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}
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if (flag_print_uid + flag_print_gid + flag_print_gid_all > 1) {
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fprintf(stderr, "cannot print \"only\" of more than one choice\n");
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return 1;
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}
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int status = print_id_objects();
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return status;
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}
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bool print_uid_object(uid_t uid)
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{
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if (flag_print_name) {
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struct passwd* pw = getpwuid(uid);
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printf("%s", pw ? pw->pw_name : "n/a");
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} else
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printf("%u", uid);
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return true;
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}
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bool print_gid_object(gid_t gid)
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{
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if (flag_print_name) {
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struct group* gr = getgrgid(gid);
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printf("%s", gr ? gr->gr_name : "n/a");
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} else
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printf("%u", gid);
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return true;
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}
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bool print_gid_list()
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{
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int extra_gid_count = getgroups(0, nullptr);
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if (extra_gid_count) {
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auto* extra_gids = (gid_t*)alloca(extra_gid_count * sizeof(gid_t));
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int rc = getgroups(extra_gid_count, extra_gids);
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if (rc < 0) {
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perror("\ngetgroups");
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return false;
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}
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for (int g = 0; g < extra_gid_count; ++g) {
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auto* gr = getgrgid(extra_gids[g]);
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if (flag_print_name && gr)
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printf("%s", gr->gr_name);
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else
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printf("%u", extra_gids[g]);
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if (g != extra_gid_count - 1)
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printf(" ");
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}
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}
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return true;
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}
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bool print_full_id_list()
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{
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uid_t uid = getuid();
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gid_t gid = getgid();
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struct passwd* pw = getpwuid(uid);
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struct group* gr = getgrgid(gid);
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printf("uid=%u(%s) gid=%u(%s)", uid, pw ? pw->pw_name : "n/a", gid, gr ? gr->gr_name : "n/a");
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int extra_gid_count = getgroups(0, nullptr);
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if (extra_gid_count) {
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auto* extra_gids = (gid_t*)alloca(extra_gid_count * sizeof(gid_t));
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int rc = getgroups(extra_gid_count, extra_gids);
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if (rc < 0) {
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perror("\ngetgroups");
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return false;
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}
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printf(" groups=");
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for (int g = 0; g < extra_gid_count; ++g) {
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auto* gr = getgrgid(extra_gids[g]);
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if (gr)
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printf("%u(%s)", extra_gids[g], gr->gr_name);
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else
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printf("%u", extra_gids[g]);
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if (g != extra_gid_count - 1)
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printf(",");
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}
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}
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return true;
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}
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int print_id_objects()
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{
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if (flag_print_uid) {
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if (!print_uid_object(getuid()))
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return 1;
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} else if (flag_print_gid) {
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if (!print_gid_object(getgid()))
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return 1;
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} else if (flag_print_gid_all) {
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if (!print_gid_list())
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return 1;
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} else {
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if (!print_full_id_list())
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return 1;
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}
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printf("\n");
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return 0;
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}
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