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92 lines
2.2 KiB
C++
92 lines
2.2 KiB
C++
/*
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* Copyright (c) 2019-2020, Jesse Buhagiar <jooster669@gmail.com>
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* Copyright (c) 2021, Brandon Pruitt <brapru@pm.me>
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* Copyright (c) 2021, Maxime Friess <M4x1me@pm.me>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibCore/ArgsParser.h>
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#include <ctype.h>
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#include <grp.h>
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#include <string.h>
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#include <unistd.h>
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constexpr gid_t GROUPS_GID = 100;
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int main(int argc, char** argv)
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{
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if (pledge("stdio wpath rpath cpath chown", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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int gid = 0;
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char const* groupname = nullptr;
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Core::ArgsParser args_parser;
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args_parser.add_option(gid, "Group ID (gid) for the new group", "gid", 'g', "gid");
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args_parser.add_positional_argument(groupname, "Name of the group (groupname)", "group");
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args_parser.parse(argc, argv);
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// Let's run a quick sanity check on groupname
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if (strpbrk(groupname, "\\/!@#$%^&*()~+=`:\n")) {
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warnln("invalid character in groupname, {}", groupname);
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return 1;
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}
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// Disallow names starting with _ and -
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if (groupname[0] == '_' || groupname[0] == '-' || !isalpha(groupname[0])) {
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warnln("invalid groupname, {}", groupname);
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return 1;
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}
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if (getgrnam(groupname)) {
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warnln("Group {} already exists!", groupname);
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return 1;
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}
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if (gid < 0) {
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warnln("invalid gid {}!", gid);
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return 3;
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}
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// First, let's sort out the gid for the group
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if (gid > 0) {
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if (getgrgid(static_cast<uid_t>(gid))) {
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warnln("gid {} already exists!", gid);
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return 4;
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}
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} else {
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for (gid = GROUPS_GID; getgrgid(static_cast<uid_t>(gid)); gid++) {
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}
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}
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if (gid < 0) {
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warnln("invalid gid {}", gid);
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return 3;
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}
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FILE* grfile = fopen("/etc/group", "a");
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if (!grfile) {
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perror("failed to open /etc/group");
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return 1;
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}
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struct group g;
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g.gr_name = const_cast<char*>(groupname);
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g.gr_passwd = const_cast<char*>("x");
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g.gr_gid = static_cast<gid_t>(gid);
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g.gr_mem = nullptr;
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if (putgrent(&g, grfile) < 0) {
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perror("putpwent");
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return 1;
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}
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fclose(grfile);
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return 0;
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}
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