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>
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/*
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* SPDX-FileCopyrightText: 2012 Eric Biederman
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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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#ifdef ENABLE_SUBIDS
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#include <assert.h>
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#include <stdio.h>
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#include <errno.h>
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#include "prototypes.h"
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#include "subordinateio.h"
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#include "getdef.h"
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#include "shadowlog.h"
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/*
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* find_new_sub_uids - Find a new unused range of UIDs.
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*
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* If successful, find_new_sub_uids provides a range of unused
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* user IDs in the [SUB_UID_MIN:SUB_UID_MAX] range.
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*
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* Return 0 on success, -1 if no unused UIDs are available.
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*/
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int find_new_sub_uids (uid_t *range_start, unsigned long *range_count)
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{
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unsigned long min, max;
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unsigned long count;
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uid_t start;
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assert (range_start != NULL);
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assert (range_count != NULL);
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min = getdef_ulong ("SUB_UID_MIN", 100000UL);
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max = getdef_ulong ("SUB_UID_MAX", 600100000UL);
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count = getdef_ulong ("SUB_UID_COUNT", 65536);
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if (min > max || count >= max || (min + count - 1) > max) {
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(void) fprintf (log_get_logfd(),
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_("%s: Invalid configuration: SUB_UID_MIN (%lu),"
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" SUB_UID_MAX (%lu), SUB_UID_COUNT (%lu)\n"),
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log_get_progname(), min, max, count);
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return -1;
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}
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start = sub_uid_find_free_range(min, max, count);
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if (start == (uid_t)-1) {
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fprintf (log_get_logfd(),
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_("%s: Can't get unique subordinate UID range\n"),
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log_get_progname());
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SYSLOG ((LOG_WARN, "no more available subordinate UIDs on the system"));
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return -1;
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}
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*range_start = start;
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*range_count = count;
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return 0;
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}
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#else /* !ENABLE_SUBIDS */
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extern int ISO_C_forbids_an_empty_translation_unit;
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#endif /* !ENABLE_SUBIDS */
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