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/* Routines for vectors of uids/gids
Copyright (C) 1995,96,97,99,2001 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.org>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifndef __IDVEC_H__
#define __IDVEC_H__
#include <sys/types.h>
#include <hurd/hurd_types.h>
#include <errno.h>
#include <string.h>
#ifndef IDVEC_EI
#define IDVEC_EI extern inline
#endif
struct idvec
{
uid_t *ids;
unsigned num, alloced;
};
#define IDVEC_INIT { 0 }
/* Return a new, empty, idvec, or NULL if there wasn't enough memory. */
struct idvec *make_idvec (void);
/* Free the storage pointed to by IDVEC->ids. */
void idvec_free_contents (struct idvec *idvec);
#define idvec_fini idvec_free_contents
/* Free IDVEC, but not the storage pointed to by the IDS field. */
void idvec_free_wrapper (struct idvec *idvec);
/* Free IDVEC and any storage associated with it. */
void idvec_free (struct idvec *idvec);
/* Mark IDVEC as not containing any ids. */
IDVEC_EI void
idvec_clear (struct idvec *idvec)
{
idvec->num = 0;
}
/* Returns true if IDVEC contains no ids. */
IDVEC_EI int
idvec_is_empty (const struct idvec *idvec)
{
return idvec->num == 0;
}
/* Return true if IDVEC1 has contents identical to IDVEC2. */
IDVEC_EI int
idvec_equal (const struct idvec *idvec1, const struct idvec *idvec2)
{
size_t num = idvec1->num;
return idvec2->num == num
&& (num == 0
|| memcmp (idvec1->ids, idvec2->ids, num * sizeof *idvec1->ids) == 0);
}
/* Ensure that IDVEC has enough spaced allocated to hold NUM ids, thus
ensuring that any subsequent ids added won't return a memory allocation
error unless it would result in more ids that NUM. ENOMEM is returned if
a memory allocation error occurs. */
error_t idvec_ensure (struct idvec *idvec, unsigned num);
/* Like idvec_ensure(), but takes INC, the increment of the number of ids
already in IDVEC as an argument. */
error_t idvec_grow (struct idvec *idvec, unsigned inc);
/* Returns true if IDVEC contains ID, at or after position POS. */
int idvec_tail_contains (const struct idvec *idvec, unsigned pos, uid_t id);
/* Returns true if IDVEC contains ID. */
IDVEC_EI int
idvec_contains (const struct idvec *idvec, uid_t id)
{
return idvec_tail_contains (idvec, 0, id);
}
/* Insert ID into IDVEC at position POS, returning ENOMEM if there wasn't
enough memory, or 0. */
error_t idvec_insert (struct idvec *idvec, unsigned pos, uid_t id);
/* Add ID onto the end of IDVEC, returning ENOMEM if there's not enough memory,
or 0. */
error_t idvec_add (struct idvec *idvec, uid_t id);
/* If IDVEC doesn't contain ID, add it onto the end, returning ENOMEM if
there's not enough memory; otherwise, do nothing. */
error_t idvec_add_new (struct idvec *idvec, uid_t id);
/* If IDVEC doesn't contain ID at position POS or after, insert it at POS,
returning ENOMEM if there's not enough memory; otherwise, do nothing. */
error_t idvec_insert_new (struct idvec *idvec, unsigned pos, uid_t id);
/* Set the ids in IDVEC to IDS (NUM elements long); delete whatever
the previous ids were. */
error_t idvec_set_ids (struct idvec *idvec, const uid_t *ids, unsigned num);
/* Like idvec_set_ids, but get the new ids from new. */
error_t idvec_set (struct idvec *idvec, const struct idvec *new);
/* Adds each id in the vector IDS (NUM elements long) to IDVEC, as if with
idvec_add_new(). */
error_t idvec_merge_ids (struct idvec *idvec, const uid_t *ids, unsigned num);
/* Adds each id from NEW to IDVEC, as if with idvec_add_new(). */
error_t idvec_merge (struct idvec *idvec, const struct idvec *new);
/* Remove all ids in SUB from IDVEC, returning true if anything was done. */
int idvec_subtract (struct idvec *idvec, const struct idvec *sub);
/* Remove all ids from IDVEC that are *not* in KEEP, returning true if
anything was changed. */
int idvec_keep (struct idvec *idvec, const struct idvec *keep);
/* Remove any occurrences of ID in IDVEC after position POS> Returns true if
anything was done. */
int idvec_remove (struct idvec *idvec, unsigned pos, uid_t id);
/* Deleted the id at position POS in IDVEC. */
void idvec_delete (struct idvec *idvec, unsigned pos);
/* Insert ID at position POS in IDVEC, remove any instances of ID previously
present at POS or after. ENOMEM is returned if there's not enough memory,
otherwise 0. */
error_t idvec_insert_only (struct idvec *idvec, unsigned pos, uid_t id);
/* EFF and AVAIL should be idvec's corresponding to a process's
effective and available ids. ID replaces the first id in EFF, and,
if there are any IDs in AVAIL, replaces the second ID in AVAIL;
what it replaces in any case is preserved by adding it to AVAIL if
not already present. In addition, the If SECURE is non-NULL, and
ID was not previously present in either EFF or AVAIL, then *SECURE
is set to true. ENOMEM is returned if a malloc fails, otherwise 0.
The return parameters are only touched if this call succeeds. */
error_t idvec_setid (struct idvec *eff, struct idvec *avail, uid_t id,
int *secure);
/* Add to all of EFF_UIDS, AVAIL_UIDS, EFF_GIDS, AVAIL_GIDS (as if with
idvec_merge) the ids associated with the auth port AUTH. Any of these
parameters may be NULL if that information isn't desired. */
error_t idvec_merge_auth (struct idvec *eff_uids, struct idvec *avail_uids,
struct idvec *eff_gids, struct idvec *avail_gids,
auth_t auth);
/* Add to GIDS those group ids implied by the users in UIDS. */
error_t idvec_merge_implied_gids (struct idvec *gids, const struct idvec *uids);
/* Make sure the user has the right to the ids in UIDS and GIDS, given that
we know he already has HAVE_UIDS and HAVE_GIDS, asking for passwords (with
GETPASS_FN) where necessary; any of the arguments may be 0, which is
treated the same as if they were empty. 0 is returned if access should be
allowed, otherwise EINVAL if an incorrect password was entered, or an
error relating to resource failure. Any uid/gid < 0 will be guaranteed to
fail regardless of what the user types. GETPASS_FN should ask for a
password from the user, and return it in malloced storage; it defaults to
using the standard libc function getpass. If VERIFY_FN is 0, then the
users password will be encrypted with crypt and compared with the
password/group entry's encrypted password, otherwise, VERIFY_FN will be
called to check the entered password's validity; it should return 0 if the
given password is correct, or an error code. The common arguments to
GETPASS_FN and VERIFY_FN are: ID, the user/group id; IS_GROUP, true if its
a group, or false if a user; PWD_OR_GRP, a pointer to either the passwd or
group entry for ID, and HOOK, containing the appropriate hook passed into
idvec_verify. */
error_t idvec_verify (const struct idvec *uids, const struct idvec *gids,
const struct idvec *have_uids,
const struct idvec *have_gids,
char *(*getpass_fn) (const char *prompt,
uid_t id, int is_group,
void *pwd_or_grp, void *hook),
void *getpass_hook,
error_t (*verify_fn) (const char *password,
uid_t id, int is_group,
void *pwd_or_grp, void *hook),
void *verify_hook);
/* Return a string representation of the ids in IDVEC, each id separated by
the string SEP (default ","). SHOW_VALUES and SHOW_NAMES reflect how each
id is printed (if SHOW_NAMES is true values are used where names aren't
available); if both are true, the `VALUE(NAME)' format is used.
ID_NAME_FN is used to map each id to a name; it should return a malloced
string, which will be freed here. The empty string is returned for an
empty list, and 0 for an allocation error. */
char *idvec_rep (const struct idvec *idvec,
int show_values, int show_names,
char *(*id_name_fn) (uid_t id),
const char *sep);
/* Like idvec_rep, mapping ids to user names. */
char *idvec_uids_rep (const struct idvec *idvec,
int show_values, int show_names,
const char *sep);
/* Like idvec_rep, mapping ids to group names. */
char *idvec_gids_rep (const struct idvec *idvec,
int show_values, int show_names,
const char *sep);
#endif /* __IDVEC_H__ */
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