e2df287aad
It is Undefined Behavior to declare errno (see NOTES in its manual page). Instead of using the errno dummy declaration, use one that doesn't need a comment. Signed-off-by: Alejandro Colomar <alx@kernel.org>
115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
/*
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* SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
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* SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
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* SPDX-FileCopyrightText: 2001 - 2006, Tomasz Kłoczko
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* SPDX-FileCopyrightText: 2007 - 2009, Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#if defined (HAVE_SETGROUPS) && ! defined (USE_PAM)
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#include "prototypes.h"
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#include "defines.h"
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#include <stdio.h>
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#include <grp.h>
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#include <errno.h>
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#include "shadowlog.h"
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#ident "$Id$"
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#define SEP ",:"
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/*
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* Add groups with names from LIST (separated by commas or colons)
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* to the supplementary group set. Silently ignore groups which are
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* already there. Warning: uses strtok().
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*/
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int add_groups (const char *list)
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{
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GETGROUPS_T *grouplist, *tmp;
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size_t i;
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int ngroups;
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bool added;
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char *token;
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char buf[1024];
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int ret;
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FILE *shadow_logfd = log_get_logfd();
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if (strlen (list) >= sizeof (buf)) {
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errno = EINVAL;
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return -1;
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}
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strcpy (buf, list);
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i = 16;
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for (;;) {
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grouplist = (gid_t *) malloc (i * sizeof (GETGROUPS_T));
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if (NULL == grouplist) {
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return -1;
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}
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ngroups = getgroups (i, grouplist);
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if ( ( (-1 == ngroups)
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&& (EINVAL != errno))
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|| (i > (size_t)ngroups)) {
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/* Unexpected failure of getgroups or successful
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* reception of the groups */
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break;
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}
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/* not enough room, so try allocating a larger buffer */
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free (grouplist);
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i *= 2;
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}
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if (ngroups < 0) {
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free (grouplist);
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return -1;
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}
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added = false;
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for (token = strtok (buf, SEP); NULL != token; token = strtok (NULL, SEP)) {
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struct group *grp;
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grp = getgrnam (token); /* local, no need for xgetgrnam */
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if (NULL == grp) {
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fprintf (shadow_logfd, _("Warning: unknown group %s\n"),
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token);
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continue;
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}
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for (i = 0; i < (size_t)ngroups && grouplist[i] != grp->gr_gid; i++);
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if (i < (size_t)ngroups) {
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continue;
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}
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if (ngroups >= sysconf (_SC_NGROUPS_MAX)) {
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fputs (_("Warning: too many groups\n"), shadow_logfd);
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break;
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}
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tmp = (gid_t *) realloc (grouplist, (size_t)(ngroups + 1) * sizeof (GETGROUPS_T));
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if (NULL == tmp) {
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free (grouplist);
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return -1;
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}
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tmp[ngroups] = grp->gr_gid;
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ngroups++;
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grouplist = tmp;
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added = true;
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}
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if (added) {
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ret = setgroups ((size_t)ngroups, grouplist);
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free (grouplist);
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return ret;
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}
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free (grouplist);
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return 0;
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}
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#else /* HAVE_SETGROUPS && !USE_PAM */
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extern int ISO_C_forbids_an_empty_translation_unit;
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#endif /* HAVE_SETGROUPS && !USE_PAM */
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