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This file is part of the GNU C Library.

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The GNU C Library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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The GNU C Library 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 GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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/* Declaration of types and functions for "shadow" storage of hashed

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passphrases. The shadow database is like the user database, but is

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only accessible with special privileges, so that malicious users

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cannot retrieve everyone else's hashed passphrase to brute-force at

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their convenience. */

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#ifndef _SHADOW_H

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#define _SHADOW_H 1

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#include <features.h>

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#include <paths.h>

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#define __need_size_t

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#include <stddef.h>

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#include <bits/types/FILE.h>

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/* Paths to the user database files. */

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#define SHADOW _PATH_SHADOW

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__BEGIN_DECLS

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/* A record in the shadow database. */

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struct spwd

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{

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char *sp_namp; /* Login name. */

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char *sp_pwdp; /* Hashed passphrase. */

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long int sp_lstchg; /* Date of last change. */

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long int sp_min; /* Minimum number of days between changes. */

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long int sp_max; /* Maximum number of days between changes. */

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long int sp_warn; /* Number of days to warn user to change

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the password. */

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long int sp_inact; /* Number of days the account may be

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inactive. */

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long int sp_expire; /* Number of days since 1970-01-01 until

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account expires. */

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unsigned long int sp_flag; /* Reserved. */

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};

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/* Open database for reading.

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This function is not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation it is a cancellation point and

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therefore not marked with __THROW. */

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extern void setspent (void);

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/* Close database.

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This function is not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation it is a cancellation point and

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therefore not marked with __THROW. */

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extern void endspent (void);

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/* Get next entry from database, perhaps after opening the file.

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This function is not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation it is a cancellation point and

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therefore not marked with __THROW. */

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extern struct spwd *getspent (void);

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/* Get shadow entry matching NAME.

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This function is not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation it is a cancellation point and

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therefore not marked with __THROW. */

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extern struct spwd *getspnam (const char *__name);

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/* Read shadow entry from STRING.

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This function is not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation it is a cancellation point and

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therefore not marked with __THROW. */

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extern struct spwd *sgetspent (const char *__string);

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/* Read next shadow entry from STREAM.

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This function is not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation it is a cancellation point and

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therefore not marked with __THROW. */

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extern struct spwd *fgetspent (FILE *__stream);

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/* Write line containing shadow entry to stream.

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This function is not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation it is a cancellation point and

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therefore not marked with __THROW. */

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extern int putspent (const struct spwd *__p, FILE *__stream);

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#ifdef __USE_MISC

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/* Reentrant versions of some of the functions above.

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These functions are not part of POSIX and therefore no official

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cancellation point. But due to similarity with an POSIX interface

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or due to the implementation they are cancellation points and

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therefore not marked with __THROW. */

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extern int getspent_r (struct spwd *__result_buf, char *__buffer,

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size_t __buflen, struct spwd **__result);

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extern int getspnam_r (const char *__name, struct spwd *__result_buf,

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char *__buffer, size_t __buflen,

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struct spwd **__result);

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extern int sgetspent_r (const char *__string, struct spwd *__result_buf,

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char *__buffer, size_t __buflen,

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struct spwd **__result);

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extern int fgetspent_r (FILE *__stream, struct spwd *__result_buf,

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char *__buffer, size_t __buflen,

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struct spwd **__result);

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#endif /* misc */

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/* The simple locking functionality provided here is not suitable for

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multi-threaded applications. */

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/* Request exclusive access to /etc/passwd and /etc/shadow. */

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extern int lckpwdf (void) __THROW;

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/* Release exclusive access to /etc/passwd and /etc/shadow. */

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extern int ulckpwdf (void) __THROW;

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__END_DECLS

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#endif /* shadow.h */

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