/*
Unix SMB / CIFS implementation .
Safe versions of getpw * calls
Copyright ( C ) Andrew Bartlett 2002
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 of the License , 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 0213 9 , USA .
*/
# include "includes.h"
static struct passwd * alloc_copy_passwd ( const struct passwd * from )
{
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struct passwd * ret = SMB_XMALLOC_P ( struct passwd ) ;
ZERO_STRUCTP ( ret ) ;
ret - > pw_name = smb_xstrdup ( from - > pw_name ) ;
ret - > pw_passwd = smb_xstrdup ( from - > pw_passwd ) ;
ret - > pw_uid = from - > pw_uid ;
ret - > pw_gid = from - > pw_gid ;
ret - > pw_gecos = smb_xstrdup ( from - > pw_gecos ) ;
ret - > pw_dir = smb_xstrdup ( from - > pw_dir ) ;
ret - > pw_shell = smb_xstrdup ( from - > pw_shell ) ;
return ret ;
}
void passwd_free ( struct passwd * * buf )
{
if ( ! * buf ) {
DEBUG ( 0 , ( " attempted double-free of allocated passwd \n " ) ) ;
return ;
}
SAFE_FREE ( ( * buf ) - > pw_name ) ;
SAFE_FREE ( ( * buf ) - > pw_passwd ) ;
SAFE_FREE ( ( * buf ) - > pw_gecos ) ;
SAFE_FREE ( ( * buf ) - > pw_dir ) ;
SAFE_FREE ( ( * buf ) - > pw_shell ) ;
SAFE_FREE ( * buf ) ;
}
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# define PWNAMCACHE_SIZE 4
static struct passwd * pwnam_cache [ PWNAMCACHE_SIZE ] ;
static BOOL pwnam_cache_initialized = False ;
static void init_pwnam_cache ( void )
{
int i ;
if ( pwnam_cache_initialized )
return ;
for ( i = 0 ; i < PWNAMCACHE_SIZE ; i + + )
pwnam_cache [ i ] = NULL ;
pwnam_cache_initialized = True ;
return ;
}
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void flush_pwnam_cache ( void )
{
int i ;
init_pwnam_cache ( ) ;
for ( i = 0 ; i < PWNAMCACHE_SIZE ; i + + ) {
if ( pwnam_cache [ i ] = = NULL )
continue ;
passwd_free ( & pwnam_cache [ i ] ) ;
}
}
struct passwd * getpwnam_alloc ( const char * name )
{
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int i ;
struct passwd * temp ;
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init_pwnam_cache ( ) ;
for ( i = 0 ; i < PWNAMCACHE_SIZE ; i + + ) {
if ( ( pwnam_cache [ i ] ! = NULL ) & &
( strcmp ( name , pwnam_cache [ i ] - > pw_name ) = = 0 ) ) {
DEBUG ( 10 , ( " Got %s from pwnam_cache \n " , name ) ) ;
return alloc_copy_passwd ( pwnam_cache [ i ] ) ;
}
}
temp = sys_getpwnam ( name ) ;
if ( ! temp ) {
#if 0
if ( errno = = ENOMEM ) {
/* what now? */
}
# endif
return NULL ;
}
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for ( i = 0 ; i < PWNAMCACHE_SIZE ; i + + ) {
if ( pwnam_cache [ i ] = = NULL )
break ;
}
if ( i = = PWNAMCACHE_SIZE )
i = rand ( ) % PWNAMCACHE_SIZE ;
if ( pwnam_cache [ i ] ! = NULL )
passwd_free ( & pwnam_cache [ i ] ) ;
pwnam_cache [ i ] = alloc_copy_passwd ( temp ) ;
return alloc_copy_passwd ( temp ) ;
}
struct passwd * getpwuid_alloc ( uid_t uid )
{
struct passwd * temp ;
temp = sys_getpwuid ( uid ) ;
if ( ! temp ) {
#if 0
if ( errno = = ENOMEM ) {
/* what now? */
}
# endif
return NULL ;
}
return alloc_copy_passwd ( temp ) ;
}