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