mirror of
https://github.com/rd235/cado
synced 2024-12-27 06:24:11 +01:00
68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/*
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* cado: execute a command in a capability ambient
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* Copyright (C) 2016 Renzo Davoli, University of Bologna
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*
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* This file is part of cado.
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*
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* Cado is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <get_user_groups.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <grp.h>
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#include <pwd.h>
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/* if the user does not exist get_user_groups returns NULL,
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otherwise it returns a dynamic allocated array whose
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first element (0) is the username of the current user.
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The following elements are the names of all the groups the current user belongs to.
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A NULL element tags the end of the array */
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char **get_user_groups(void) {
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uid_t uid=getuid();
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struct passwd *pwd=getpwuid(uid);
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int ngroups=0;
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char **user_groups=NULL;
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if (pwd == NULL)
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return NULL;
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getgrouplist(pwd->pw_name, pwd->pw_gid, NULL, &ngroups);
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if (ngroups > 0) {
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gid_t gids[ngroups];
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struct group *grp;
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user_groups = calloc(ngroups+2, sizeof(char *));
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if (user_groups) {
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int i=0;
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user_groups[i++] = strdup(pwd->pw_name);
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if (getgrouplist(pwd->pw_name, pwd->pw_gid, gids, &ngroups) == ngroups) {
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while ((grp=getgrent()) != NULL) {
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int j;
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for (j=0; j<ngroups; j++) {
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if (grp->gr_gid == gids[j]) {
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gids[j] = -1;
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user_groups[i++] = strdup(grp->gr_name);
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}
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}
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}
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user_groups[i] = NULL;
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endgrent();
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}
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}
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}
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return user_groups;
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}
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