shadow - phpMan

SHADOW(3)                                                            SHADOW(3)



NAME
       shadow - encrypted password file routines

SYNTAX
       #include <shadow.h>

       struct spwd *getspent();

       struct spwd *getspnam(char *name);

       void setspent();

       void endspent();

       struct spwd *fgetspent(FILE *fp);

       struct spwd *sgetspent(char *cp);

       int putspent(struct spwd *p, FILE *fp);

       int lckpwdf();

       int ulckpwdf();

DESCRIPTION
       shadow manipulates the contents of the shadow password file, /etc/shadow. The
       structure in the #include file is:

       struct spwd {
             char          *sp_namp; /* user login name */
             char          *sp_pwdp; /* encrypted password */
             long int      sp_lstchg; /* last password change */
             long int      sp_min; /* days until change allowed. */
             long int      sp_max; /* days before change required */
             long int      sp_warn; /* days warning for expiration */
             long int      sp_inact; /* days before account inactive */
             long int      sp_expire; /* date when account expires */
             unsigned long int  sp_flag; /* reserved for future use */
       }


       The meanings of each field are:

       ·  sp_namp - pointer to null-terminated user name

       ·  sp_pwdp - pointer to null-terminated password

       ·  sp_lstchg - days since Jan 1, 1970 password was last changed

       ·  sp_min - days before which password may not be changed

       ·  sp_max - days after which password must be changed

       ·  sp_warn - days before password is to expire that user is warned of pending
          password expiration

       ·  sp_inact - days after password expires that account is considered inactive and
          disabled

       ·  sp_expire - days since Jan 1, 1970 when account will be disabled

       ·  sp_flag - reserved for future use

DESCRIPTION
       getspent, getspname fgetspent, and sgetspent each return a pointer to a struct
       spwd.  getspent returns the next entry from the file, and fgetspent returns the
       next entry from the given stream, which is assumed to be a file of the proper
       format.  sgetspent returns a pointer to a struct spwd using the provided string as
       input.  getspnam searches from the current position in the file for an entry
       matching name.

       setspent and endspent may be used to begin and end, respectively, access to the
       shadow password file.

       The lckpwdf and ulckpwdf routines should be used to insure exclusive access to the
       /etc/shadow file.  lckpwdf attempts to acquire a lock using pw_lock for up to 15
       seconds. It continues by attempting to acquire a second lock using spw_lock for the
       remainder of the initial 15 seconds. Should either attempt fail after a total of 15
       seconds, lckpwdf returns -1. When both locks are acquired 0 is returned.

DIAGNOSTICS
       Routines return NULL if no more entries are available or if an error occurs during
       processing. Routines which have int as the return value return 0 for success and -1
       for failure.

CAVEATS
       These routines may only be used by the super user as access to the shadow password
       file is restricted.

FILES
       /etc/shadow
              secure user account information

SEE ALSO
       getpwent(3), shadow(5)

AUTHOR
       Julianne Frances Haugh (jockgrrl AT ix.com)



                                  08/03/2005                         SHADOW(3)

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