86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
/*
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* Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#include <grp.h>
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#include <missing.h>
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/*
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* BSD-compatible getgrouplist(3) using getgrent(3)
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*/
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int
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getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroupsp)
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{
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int i, ngroups = 1;
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int grpsize = *ngroupsp;
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int rval = -1;
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struct group *grp;
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/* We support BSD semantics where the first element is the base gid */
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if (grpsize <= 0)
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return -1;
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groups[0] = basegid;
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setgrent();
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while ((grp = getgrent()) != NULL) {
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if (grp->gr_gid == basegid)
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continue;
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for (i = 0; grp->gr_mem[i] != NULL; i++) {
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if (strcmp(name, grp->gr_mem[i]) == 0)
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break;
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}
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if (grp->gr_mem[i] == NULL)
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continue; /* user not found */
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/* Only add if it is not the same as an existing gid */
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for (i = 0; i < ngroups; i++) {
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if (grp->gr_gid == groups[i])
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break;
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}
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if (i == ngroups) {
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if (ngroups == grpsize)
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goto done;
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groups[ngroups++] = grp->gr_gid;
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}
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}
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rval = 0;
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done:
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endgrent();
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*ngroupsp = ngroups;
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return rval;
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}
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