/*****************************************************************************/
/*
                                 overseer.c

The overseer is the certificate management activity executing in the detached
process.  It schedules the once-per-day certificate expiry management activity.
The overseer.c module is considered the main module of wCME as an autonomous
certificate management agent.  Acme-client-portable has its own main.c module.



COPYRIGHT
---------
Copyright (C) 2017-2019 Mark G.Daniel
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it under the
conditions of the GNU GENERAL PUBLIC LICENSE, version 3, or any later version.
http://www.gnu.org/licenses/gpl.txt



VERSION HISTORY
---------------
20-MAR-2019  MGD  v2.0.1, UtilSetPrn() detect set process name failure
24-JAN-2019  MGD  v2.0.0, move to OpenBSD source
30-MAR-2018  MGD  WCME_AGREEMENT logical name
                  [.acme-client-portable-0_1_15]VMS.c timegm() code revised
15-OCT-2017  MGD  wcme_socketpair() for building on earlier than VMS V8.2
23-JUL-2017  MGD  http-01 standalone challenge server
09-JUL-2017  MGD  initial release
23-APR-2017  MGD  initial development
*/
/*****************************************************************************/

#define SOFTWAREVN "2.0.1"
#define SOFTWARENM "WCME"
#ifdef __ALPHA
#  define SOFTWAREID SOFTWARENM " AXP-" SOFTWAREVN
#endif
#ifdef __ia64
#  define SOFTWAREID SOFTWARENM " IA64-" SOFTWAREVN
#endif
#ifdef __VAX
#  define SOFTWAREID SOFTWARENM " VAX-" SOFTWAREVN
#endif

#include <ctype.h>
#include <errno.h>
#include <stat.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <types.h>
#include <unistd.h>
#include <unixlib.h>

#include <descrip.h>
#include <jpidef.h>
#include <prvdef.h>
#include <ssdef.h>
#include <starlet.h>

#include "certman.h"
#include "overseer.h"
#include "util.h"
#include "acme-client/wcme_config.h"

#include "wcme_tls_internal.h"

#define FI_LI "OVERSEER", __LINE__

char  *WcmeLogFileName;

char  SoftwareId [] = SOFTWAREID;

char* doasprintf (char*, ...);

/*****************************************************************************/
/*
Called from [.acme-client]main.c when a detached process.
Oversees the periodic certificate check and any required update.
*/

void OverseerProcess (int argc, char* argv[])

{
   static short  PrevDay;

   int  secs, status,
        NewLog,
        PerHour,
        PollSecs;
   ulong BinTime [2];
   ushort NumTime [7];
   char  *cptr;

   /*********/
   /* begin */
   /*********/

   /* most likely reason for failure to set process name */
   if (!UtilSetPrn ("overseer")) exit (SS$_DUPLNAM);

   /* in case there's a detached process log being generated */
   sys$gettim (&BinTime);
   sys$numtim (&NumTime, &BinTime);
   fprintf (stdout,
"%%WCME-I-STARTUP, %04.04u-%02.02u-%02.02u-%02.02u:%02.02u:%02.02u\n\
%%WCME-I-VERSION, %s\n\
%%WCME-I-IMAGE, %s\n",
            NumTime[0], NumTime[1], NumTime[2],
            NumTime[3], NumTime[4], NumTime[5], 
            OverseerVersion(),
            UtilImageName());

   /* only intended for development purposes */
   if (cptr = UtilTrnLnm ("WCME_OVERSEER_POLL", "LNM$SYSTEM", 0))
   {
      PollSecs = atoi(cptr);
      if (PollSecs <= 0 || PollSecs > 3600) PollSecs = 60;
   }
   else
      PollSecs = 0;

   for (;;)
   {
      sys$gettim (&BinTime);
      sys$numtim (&NumTime, &BinTime);

      /* open the log */
      NewLog = OverseerLog (NumTime[0], NumTime[1]);

      if (!PrevDay)
         vmsdbg ("%s starting %s", UtilUserName(), OverseerVersion());
      else
      if (NewLog)
         vmsdbg ("%s running %s", UtilUserName(), OverseerVersion());

      /* only intended for development purposes */
      PerHour = (UtilTrnLnm ("WCME_OVERSEER_HOURLY", "LNM$SYSTEM", 0) != NULL);

      if ((PrevDay && PrevDay != NumTime[2]) || PerHour)
      {
         /* day has changed so perform certificate management */
         vmsdbg ("certificate management");
         CertManBegin ();
         /* reload the time in case of extended certificate activities */
         sys$gettim (&BinTime);
         sys$numtim (&NumTime, &BinTime);
      }
      PrevDay = NumTime[2];
      /* polls at twenty minutes after each hour */
      secs = (3600 - (NumTime[4] * 60)) + (60 - NumTime[5]) + (19 * 60);

      /* close the log */
      OverseerLog (0, 0);

      if (PollSecs)
      {
         PrevDay = -1;
         sleep (PollSecs);
      }
      else
         sleep (secs);
   }
}

/*****************************************************************************/
/*
The log is maintained on a per-month basis.
*/

int OverseerLog
(
int year,
int month
)
{
   int  status;
   char  *cptr, *lfname;
   FILE  *fp;
   struct stat  stat_buf;

   /*********/
   /* begin */
   /*********/

   if (WcmeLogFileName) free (WcmeLogFileName);
   WcmeLogFileName = NULL;

   if (!year)
   {
      stderr = freopen ("/nl", "w", stderr);
      if (!stderr) exit (vaxc$errno);
      return (0);
   }

   lfname = doasprintf ("/wcme_root/log/overseer_%04.04d%02.02d.log",
                        year, month);
   WcmeLogFileName = strdup(lfname);

   UtilSysPrv();
   status = stat (lfname, &stat_buf);
   stderr = freopen (lfname, "a", stderr,
                     "ctx=rec", "rfm=var", "rat=cr",
                     "rop=rlk", "shr=get", "shr=put");
   UtilMereMortal();
   if (!stderr) exit (vaxc$errno);

   if (status) vmsdbg ("%s", (char*)UtilVmsName(lfname,-1));

   free (lfname);

   return (status != 0);
}

/*****************************************************************************/
/*
Ensure acme-client-portable warn/error output is captured.
Called by the lib$spawn()ed and furk()ed [.acme-client-portable..]main.c
Each subprocess needs an indepedent C-RTL std-I/O buffer to prevent mingling of
the data (stderr) being written.  Let the underlying RMS sort out the records.
*/

void OverseerSubprocessLog (char *lfname)

{
   /*********/
   /* begin */
   /*********/

   UtilSysPrv();
   stderr = freopen (lfname, "a", stderr,
                     "ctx=rec", "rfm=var", "rat=cr",
                     "rop=rlk", "shr=get", "shr=put");
   UtilMereMortal();
   if (!stderr) exit (vaxc$errno);

   fprintf (stdout, "%s [main] %s\n", tstamp(NULL), OverseerVersion());
}

/*****************************************************************************/
/*
*/

char* OverseerVersion ()

{
   static char  *bptr;

   char  *cptr, *sptr;

   /*********/
   /* begin */
   /*********/

   if (bptr) return (bptr);

   bptr = doasprintf ("%s built %s %s LIBTLS %s %s",
                      SoftwareId, __DATE__, __TIME__,
                      WCME_LIBTLS_VERSION,
                      OPENSSL_VERSION_TEXT);
   /* single spacing only thank you */
   for (cptr = sptr = bptr; bptr && *cptr; cptr++)
      if (*cptr != ' ' || *(cptr+1) != ' ')
         *sptr++ = *cptr;
   *sptr = '\0';

   return (bptr);
}

/*****************************************************************************/
/*
*/

void DisplayVersion ()

{
   fprintf (stdout, "%%WCME-I-VERSION, %s\n", OverseerVersion());
}

/*****************************************************************************/