2b22a6909d
Closes #325 Add a new subid_init() function which can be used to specify the stream on which error messages should be printed. (If you want to get fancy you can redirect that to memory :) If subid_init() is not called, use stderr. If NULL is passed, then /dev/null will be used. This patch also fixes up the 'Prog', which previously had to be defined by any program linking against libsubid. Now, by default in libsubid it will show (subid). Once subid_init() is called, it will use the first variable passed to subid_init(). Signed-off-by: Serge Hallyn <serge@hallyn.com>
86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
/*
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* Copyright (c) 2012 Eric Biederman
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the copyright holders or contributors may not be used to
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* endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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/*
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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 (shadow_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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Prog, 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 (shadow_logfd,
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_("%s: Can't get unique subordinate UID range\n"),
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Prog);
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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 errno; /* warning: ANSI C forbids an empty source file */
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#endif /* !ENABLE_SUBIDS */
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