shadow/libmisc/find_new_sub_gids.c
Alejandro Colomar e2df287aad Don't redefine errno(3)
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>
2022-12-22 11:43:29 +01:00

65 lines
1.6 KiB
C

/*
* SPDX-FileCopyrightText: 2012 Eric Biederman
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <config.h>
#ifdef ENABLE_SUBIDS
#include <assert.h>
#include <stdio.h>
#include <errno.h>
#include "prototypes.h"
#include "subordinateio.h"
#include "getdef.h"
#include "shadowlog.h"
/*
* find_new_sub_gids - Find a new unused range of GIDs.
*
* If successful, find_new_sub_gids provides a range of unused
* user IDs in the [SUB_GID_MIN:SUB_GID_MAX] range.
*
* Return 0 on success, -1 if no unused GIDs are available.
*/
int find_new_sub_gids (gid_t *range_start, unsigned long *range_count)
{
unsigned long min, max;
unsigned long count;
gid_t start;
assert (range_start != NULL);
assert (range_count != NULL);
min = getdef_ulong ("SUB_GID_MIN", 100000UL);
max = getdef_ulong ("SUB_GID_MAX", 600100000UL);
count = getdef_ulong ("SUB_GID_COUNT", 65536);
if (min > max || count >= max || (min + count - 1) > max) {
(void) fprintf (log_get_logfd(),
_("%s: Invalid configuration: SUB_GID_MIN (%lu),"
" SUB_GID_MAX (%lu), SUB_GID_COUNT (%lu)\n"),
log_get_progname(), min, max, count);
return -1;
}
start = sub_gid_find_free_range(min, max, count);
if (start == (gid_t)-1) {
fprintf (log_get_logfd(),
_("%s: Can't get unique subordinate GID range\n"),
log_get_progname());
SYSLOG ((LOG_WARN, "no more available subordinate GIDs on the system"));
return -1;
}
*range_start = start;
*range_count = count;
return 0;
}
#else /* !ENABLE_SUBIDS */
extern int ISO_C_forbids_an_empty_translation_unit;
#endif /* !ENABLE_SUBIDS */