86 lines
1.6 KiB
C
86 lines
1.6 KiB
C
#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, added;
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struct group *grp;
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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 = 0;
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for (token = strtok (buf, SEP); token; token = strtok (NULL, SEP)) {
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grp = getgrnam (token);
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if (!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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fprintf (stderr, _("Warning: too many groups\n"));
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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 (!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++;
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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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