1  /* Copyright (C) 2008-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <sys/types.h>
      19  #include <utmp.h>
      20  #include <errno.h>
      21  #include <stdlib.h>
      22  
      23  #include "utmp32.h"
      24  #include "utmp-convert.h"
      25  
      26  #include "utmpx32.h"
      27  #include "utmpx-convert.h"
      28  
      29  /* Allocate a static buffer to be returned to the caller.  As well as
      30     with the existing version of these functions the caller has to be
      31     aware that the contents of this buffer will change with subsequent
      32     calls.  */
      33  #define ALLOCATE_UTMPX32_OUT(OUT)			\
      34    static struct utmpx32 *OUT = NULL;			\
      35  							\
      36    if (OUT == NULL)					\
      37      {							\
      38        OUT = malloc (sizeof (struct utmpx32));		\
      39        if (OUT == NULL)					\
      40  	return NULL;					\
      41      }
      42  
      43  /* Perform a lookup for a utmpx entry matching FIELD using function
      44     FUNC.  FIELD is converted to a 64 bit utmpx and the result is
      45     converted back to 32 bit utmpx.  */
      46  #define ACCESS_UTMPX_ENTRY(FUNC, FIELD)			\
      47    struct utmpx in64;					\
      48    struct utmpx *out64;					\
      49    ALLOCATE_UTMPX32_OUT (out32);				\
      50  							\
      51    utmpx_convert32to64 (FIELD, &in64);			\
      52    out64 = FUNC (&in64);					\
      53  							\
      54    if (out64 == NULL)					\
      55      return NULL;					\
      56  							\
      57    utmpx_convert64to32 (out64, out32);			\
      58  							\
      59    return out32;
      60  
      61  
      62  /* Get the next entry from the user accounting database.  */
      63  struct utmpx32 *
      64  getutxent32 (void)
      65  {
      66    struct utmpx *out64;
      67    ALLOCATE_UTMPX32_OUT (out32);
      68  
      69    out64 = __getutxent ();
      70    if (!out64)
      71      return NULL;
      72  
      73    utmpx_convert64to32 (out64, out32);
      74    return out32;
      75  
      76  }
      77  symbol_version (getutxent32, getutxent, GLIBC_2.1);
      78  
      79  /* Get the user accounting database entry corresponding to ID.  */
      80  struct utmpx32 *
      81  getutxid32 (const struct utmpx32 *id)
      82  {
      83    ACCESS_UTMPX_ENTRY (__getutxid, id);
      84  }
      85  symbol_version (getutxid32, getutxid, GLIBC_2.1);
      86  
      87  /* Get the user accounting database entry corresponding to LINE.  */
      88  struct utmpx32 *
      89  getutxline32 (const struct utmpx32 *line)
      90  {
      91    ACCESS_UTMPX_ENTRY (__getutxline, line);
      92  }
      93  symbol_version (getutxline32, getutxline, GLIBC_2.1);
      94  
      95  /* Write the entry UTMPX into the user accounting database.  */
      96  struct utmpx32 *
      97  pututxline32 (const struct utmpx32 *utmpx)
      98  {
      99    ACCESS_UTMPX_ENTRY (__pututxline, utmpx);
     100  }
     101  symbol_version (pututxline32, pututxline, GLIBC_2.1);
     102  
     103  /* Append entry UTMP to the wtmpx-like file WTMPX_FILE.  */
     104  void
     105  updwtmpx32 (const char *wtmpx_file, const struct utmpx32 *utmpx)
     106  {
     107    struct utmpx in64;
     108  
     109    utmpx_convert32to64 (utmpx, &in64);
     110    __updwtmpx (wtmpx_file, &in64);
     111  }
     112  symbol_version (updwtmpx32, updwtmpx, GLIBC_2.1);
     113  
     114  /* Copy the information in UTMPX to UTMP.  */
     115  void
     116  getutmp32 (const struct utmpx32 *utmpx, struct utmp32 *utmp)
     117  {
     118    struct utmpx in64;
     119    struct utmp out64;
     120  
     121    utmpx_convert32to64 (utmpx, &in64);
     122    __getutmp (&in64, &out64);
     123    utmp_convert64to32 (&out64, utmp);
     124  }
     125  symbol_version (getutmp32, getutmp, GLIBC_2.1.1);
     126  
     127  /* Copy the information in UTMP to UTMPX.  */
     128  void
     129  getutmpx32 (const struct utmp32 *utmp, struct utmpx32 *utmpx)
     130  {
     131    struct utmp in64;
     132    struct utmpx out64;
     133  
     134    utmp_convert32to64 (utmp, &in64);
     135    __getutmpx (&in64, &out64);
     136    utmpx_convert64to32 (&out64, utmpx);
     137  }
     138  symbol_version (getutmpx32, getutmpx, GLIBC_2.1.1);