1  /* Copyright (c) 1998-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     This program is free software; you can redistribute it and/or modify
       5     it under the terms of the GNU General Public License as published
       6     by the Free Software Foundation; version 2 of the License, or
       7     (at your option) any later version.
       8  
       9     This program 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
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program; if not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  #include <stdarg.h>
      18  #include <stdio.h>
      19  #include <string.h>
      20  #include <syslog.h>
      21  #include <unistd.h>
      22  #include "dbg_log.h"
      23  #include "nscd.h"
      24  
      25  /* if in debug mode and we have a debug file, we write the messages to it,
      26     if in debug mode and no debug file, we write the messages to stderr,
      27     else to syslog.  */
      28  
      29  static char *logfilename;
      30  FILE *dbgout;
      31  int debug_level;
      32  
      33  void
      34  set_logfile (const char *logfile)
      35  {
      36    logfilename = strdup (logfile);
      37  }
      38  
      39  int
      40  init_logfile (void)
      41  {
      42    if (logfilename)
      43      {
      44        dbgout = fopen64 (logfilename, "a");
      45        return dbgout == NULL ? 0 : 1;
      46      }
      47    return 1;
      48  }
      49  
      50  void
      51  dbg_log (const char *fmt,...)
      52  {
      53    va_list ap;
      54    char msg2[512];
      55  
      56    va_start (ap, fmt);
      57    vsnprintf (msg2, sizeof (msg2), fmt, ap);
      58  
      59    if (debug_level > 0)
      60      {
      61        time_t t = time (NULL);
      62  
      63        struct tm now;
      64        localtime_r (&t, &now);
      65  
      66        char buf[256];
      67        strftime (buf, sizeof (buf), "%c", &now);
      68  
      69        char msg[1024];
      70        snprintf (msg, sizeof (msg), "%s - %d: %s%s", buf, getpid (), msg2,
      71  		msg2[strlen (msg2) - 1] == '\n' ? "" : "\n");
      72        if (dbgout)
      73  	{
      74  	  fputs (msg, dbgout);
      75  	  fflush (dbgout);
      76  	}
      77        else
      78  	fputs (msg, stderr);
      79      }
      80    else
      81      syslog (LOG_NOTICE, "%d %s", getpid (), msg2);
      82  
      83    va_end (ap);
      84  }