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/* group-list.c --Print a list of group IDs or names.
Copyright (C) 1989-2022 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Arnold Robbins.
Major rewrite by David MacKenzie, djm@gnu.ai.mit.edu.
Extracted from id.c by James Youngman. */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include "system.h"
#include "error.h"
#include "mgetgroups.h"
#include "quote.h"
#include "group-list.h"
/* Print all of the distinct groups the user is in. */
extern bool
print_group_list (char const *username,
uid_t ruid, gid_t rgid, gid_t egid,
bool use_names, char delim)
{
bool ok = true;
struct passwd *pwd = NULL;
if (username)
{
pwd = getpwuid (ruid);
if (pwd == NULL)
ok = false;
}
if (!print_group (rgid, use_names))
ok = false;
if (egid != rgid)
{
putchar (delim);
if (!print_group (egid, use_names))
ok = false;
}
{
gid_t *groups;
int n_groups = xgetgroups (username, (pwd ? pwd->pw_gid : egid), &groups);
if (n_groups < 0)
{
if (username)
{
error (0, errno, _("failed to get groups for user %s"),
quote (username));
}
else
{
error (0, errno, _("failed to get groups for the current process"));
}
return false;
}
for (int i = 0; i < n_groups; i++)
if (groups[i] != rgid && groups[i] != egid)
{
putchar (delim);
if (!print_group (groups[i], use_names))
ok = false;
}
free (groups);
}
return ok;
}
/* Convert a gid_t to string. Do not use this function directly.
Instead, use it via the gidtostr macro.
Beware that it returns a pointer to static storage. */
static char *
gidtostr_ptr (gid_t const *gid)
{
static char buf[INT_BUFSIZE_BOUND (uintmax_t)];
return umaxtostr (*gid, buf);
}
#define gidtostr(g) gidtostr_ptr (&(g))
/* Print the name or value of group ID GID. */
extern bool
print_group (gid_t gid, bool use_name)
{
struct group *grp = NULL;
bool ok = true;
if (use_name)
{
grp = getgrgid (gid);
if (grp == NULL)
{
error (0, 0, _("cannot find name for group ID %lu"),
(unsigned long int) gid);
ok = false;
}
}
char *s = grp ? grp->gr_name : gidtostr (gid);
fputs (s, stdout);
return ok;
}
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