/* $NetBSD: pwgr.c,v 1.1 2012/03/17 16:33:14 jruoho Exp $ */
/*
* Copyright (c) 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

/*
* This file implements replacements for all user/group-related functions
* called by id(1).  It provides fake but deterministic user and group
* information.  The details are as such:
* User root, uid 0, primary group 0 (wheel).
* User test, uid 100, primary group 100 (users), secondary group 0 (wheel).
*/

#include <sys/types.h>

#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

char Login[16];
struct group GrEntry;
struct passwd PwEntry;

gid_t
getgid(void)
{
       return 100;
}

gid_t
getegid(void)
{
       if (getenv("LIBFAKE_EGID_ROOT") != NULL)
               return 0;
       else
               return 100;
}

uid_t
getuid(void)
{
       return 100;
}

uid_t
geteuid(void)
{
       if (getenv("LIBFAKE_EUID_ROOT") != NULL)
               return 0;
       else
               return 100;
}

char *
getlogin(void)
{
       strcpy(Login, "test");
       return Login;
}

struct group *
getgrgid(gid_t gid)
{
       struct group *g = &GrEntry;

       memset(g, 0, sizeof(*g));
       if (gid == 0) {
               g->gr_name = __UNCONST("wheel");
               g->gr_gid = 0;
       } else if (gid == 100) {
               g->gr_name = __UNCONST("users");
               g->gr_gid = 100;
       } else
               g = NULL;

       return g;
}

int
getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroups)
{
       int cnt, ret;

       if (strcmp(name, "root") == 0) {
               if (*ngroups >= 1) {
                       groups[0] = basegid;
                       cnt = 1;
               }

               ret = (*ngroups >= cnt) ? 0 : -1;
               *ngroups = cnt;
       } else if (strcmp(name, "test") == 0) {
               if (*ngroups >= 1) {
                       groups[0] = basegid;
                       cnt = 1;
               }

               if (*ngroups >= 2) {
                       groups[1] = 0;
                       cnt = 2;
               }

               ret = (*ngroups >= cnt) ? 0 : -1;
               *ngroups = cnt;
       } else
               ret = -1;

       return ret;
}

int
getgroups(int gidsetlen, gid_t *gidset)
{
       if (gidsetlen < 2) {
               errno = EINVAL;
               return -1;
       }

       gidset[0] = 100;
       gidset[1] = 0;
       return 2;
}

struct passwd *
getpwnam(const char *login)
{
       struct passwd *p = &PwEntry;

       memset(p, 0, sizeof(*p));
       if (strcmp(login, "root") == 0) {
               p->pw_name = __UNCONST("root");
               p->pw_uid = 0;
               p->pw_gid = 0;
       } else if (strcmp(login, "test") == 0) {
               p->pw_name = __UNCONST("test");
               p->pw_uid = 100;
               p->pw_gid = 100;
       } else
               p = NULL;

       return p;
}

struct passwd *
getpwuid(uid_t uid)
{
       struct passwd *p = &PwEntry;

       memset(p, 0, sizeof(*p));
       if (uid == 0) {
               p->pw_name = __UNCONST("root");
               p->pw_uid = 0;
               p->pw_gid = 0;
       } else if (uid == 100) {
               p->pw_name = __UNCONST("test");
               p->pw_uid = 100;
               p->pw_gid = 100;
       } else
               p = NULL;

       return p;
}