initgroups.c

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/*
 * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */
 
#include "squid.h"
#include "compat/initgroups.h"
 
#if HAVE_GRP_H
#include <grp.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#endif
#if HAVE_STRINGS_H
#include <strings.h>
#endif
#if HAVE_LIMITS_H
#include <limits.h>
#endif
 
int initgroups(const char *name, gid_t basegid)
{
#if HAVE_SETGROUPS
#ifndef NGROUPS_MAX
#define NGROUPS_MAX 16
#endif
 
    gid_t groups[NGROUPS_MAX];
    struct group *g;
    int index = 0;
 
    setgrent();
 
    groups[index++] = basegid;
 
    while (index < NGROUPS_MAX && ((g = getgrent()) != NULL)) {
        if (g->gr_gid != basegid) {
            char **names;
 
            for (names = g->gr_mem; *names != NULL; ++names) {
 
                if (!strcmp(*names, name))
                    groups[index++] = g->gr_gid;
 
            }
        }
    }
 
    endgrent();
 
    return setgroups(index, groups);
 
#else
 
    return 0;
 
#endif /* def HAVE_SETGROUPS */
}