sysdeps/unix/sysv/linux/s390/s390-32/utmp32.c

   1 /* Copyright (C) 2008-2021 Free Software Foundation, Inc.
   2    Contributed by Andreas Krebbel <Andreas.Krebbel@de.ibm.com>.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <sys/types.h>
  20 #include <utmp.h>
  21 #include <errno.h>
  22 #include <stdlib.h>
  23
  24 #include "utmp32.h"
  25 #include "utmp-convert.h"
  26
  27 /* Allocate a static buffer to be returned to the caller.  As well as
  28    with the existing version of these functions the caller has to be
  29    aware that the contents of this buffer will change with subsequent
  30    calls.  */
  31 #define ALLOCATE_UTMP32_OUT(OUT)                        \
  32   static struct utmp32 *OUT = NULL;                     \
  33                                                         \
  34   if (OUT == NULL)                                      \
  35     {                                                   \
  36       OUT = malloc (sizeof (struct utmp32));            \
  37       if (OUT == NULL)                                  \
  38         return NULL;                                    \
  39     }
  40
  41 /* Perform a lookup for a utmp entry matching FIELD using function
  42    FUNC.  FIELD is converted to a 64 bit utmp and the result is
  43    converted back to 32 bit utmp.  */
  44 #define ACCESS_UTMP_ENTRY(FUNC, FIELD)                  \
  45   struct utmp in64;                                     \
  46   struct utmp *out64;                                   \
  47   ALLOCATE_UTMP32_OUT (out32);                          \
  48                                                         \
  49   utmp_convert32to64 (FIELD, &in64);                    \
  50   out64 = FUNC (&in64);                                 \
  51                                                         \
  52   if (out64 == NULL)                                    \
  53     return NULL;                                        \
  54                                                         \
  55   utmp_convert64to32 (out64, out32);                    \
  56                                                         \
  57   return out32;
  58
  59 /* Search forward from the current point in the utmp file until the
  60    next entry with a ut_type matching ID->ut_type.  */
  61 struct utmp32 *
  62 getutid32 (const struct utmp32 *id)
  63 {
  64   ACCESS_UTMP_ENTRY (__getutid, id)
  65 }
  66 symbol_version (getutid32, getutid, GLIBC_2.0);
  67
  68 /* Search forward from the current point in the utmp file until the
  69    next entry with a ut_line matching LINE->ut_line.  */
  70 struct utmp32 *
  71 getutline32 (const struct utmp32 *line)
  72 {
  73   ACCESS_UTMP_ENTRY (__getutline, line)
  74 }
  75 symbol_version (getutline32, getutline, GLIBC_2.0);
  76
  77 /* Write out entry pointed to by UTMP_PTR into the utmp file.  */
  78 struct utmp32 *
  79 pututline32 (const struct utmp32 *utmp_ptr)
  80 {
  81   ACCESS_UTMP_ENTRY (__pututline, utmp_ptr)
  82 }
  83 symbol_version (pututline32, pututline, GLIBC_2.0);
  84
  85 /* Read next entry from a utmp-like file.  */
  86 struct utmp32 *
  87 getutent32 (void)
  88 {
  89   struct utmp *out64;
  90   ALLOCATE_UTMP32_OUT (out32);
  91
  92   out64 = __getutent ();
  93   if (!out64)
  94     return NULL;
  95
  96   utmp_convert64to32 (out64, out32);
  97   return out32;
  98 }
  99 symbol_version (getutent32, getutent, GLIBC_2.0);
 100
 101 /* Reentrant versions of the file for handling utmp files.  */
 102
 103 int
 104 getutent32_r (struct utmp32 *buffer, struct utmp32 **result)
 105 {
 106   struct utmp out64;
 107   struct utmp *out64p;
 108   int ret;
 109
 110   ret = __getutent_r (&out64, &out64p);
 111   if (ret == -1)
 112     {
 113       *result = NULL;
 114       return -1;
 115     }
 116
 117   utmp_convert64to32 (out64p, buffer);
 118   *result = buffer;
 119
 120   return 0;
 121 }
 122 symbol_version (getutent32_r, getutent_r, GLIBC_2.0);
 123
 124 int
 125 getutid32_r (const struct utmp32 *id, struct utmp32 *buffer,
 126                struct utmp32 **result)
 127 {
 128   struct utmp in64;
 129   struct utmp out64;
 130   struct utmp *out64p;
 131   int ret;
 132
 133   utmp_convert32to64 (id, &in64);
 134
 135   ret = __getutid_r (&in64, &out64, &out64p);
 136   if (ret == -1)
 137     {
 138       *result = NULL;
 139       return -1;
 140     }
 141
 142   utmp_convert64to32 (out64p, buffer);
 143   *result = buffer;
 144
 145   return 0;
 146 }
 147 symbol_version (getutid32_r, getutid_r, GLIBC_2.0);
 148
 149 int
 150 getutline32_r (const struct utmp32 *line,
 151                  struct utmp32 *buffer, struct utmp32 **result)
 152 {
 153   struct utmp in64;
 154   struct utmp out64;
 155   struct utmp *out64p;
 156   int ret;
 157
 158   utmp_convert32to64 (line, &in64);
 159
 160   ret = __getutline_r (&in64, &out64, &out64p);
 161   if (ret == -1)
 162     {
 163       *result = NULL;
 164       return -1;
 165     }
 166
 167   utmp_convert64to32 (out64p, buffer);
 168   *result = buffer;
 169
 170   return 0;
 171
 172 }
 173 symbol_version (getutline32_r, getutline_r, GLIBC_2.0);
 174
 175 /* Append entry UTMP to the wtmp-like file WTMP_FILE.  */
 176 void
 177 updwtmp32 (const char *wtmp_file, const struct utmp32 *utmp)
 178 {
 179   struct utmp in32;
 180
 181   utmp_convert32to64 (utmp, &in32);
 182   __updwtmp (wtmp_file, &in32);
 183 }
 184 symbol_version (updwtmp32, updwtmp, GLIBC_2.0);