120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
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* Copyright (c) 1989 - 1994, Julianne Frances Haugh
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* Copyright (c) 1996 - 1998, Marek Michałkiewicz
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* Copyright (c) 2001 - 2006, Tomasz Kłoczko
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* Copyright (c) 2007 - 2008, Nicolas François
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* All rights reserved.
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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 HAVE_SETGROUPS
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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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#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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int i, ngroups;
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bool added;
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char *token;
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char buf[1024];
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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 (!grouplist)
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return -1;
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ngroups = getgroups (i, grouplist);
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if (i > ngroups)
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break;
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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 (stderr, _("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 < ngroups && grouplist[i] != grp->gr_gid; i++);
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if (i < ngroups)
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continue;
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if (ngroups >= sysconf (_SC_NGROUPS_MAX)) {
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fputs (_("Warning: too many groups\n"), stderr);
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break;
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}
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tmp = (gid_t *) realloc (grouplist, (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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grouplist = tmp;
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added = true;
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}
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if (added)
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return setgroups (ngroups, grouplist);
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return 0;
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}
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#endif
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