src/stored/append.c

/*
   Bacula(R) - The Network Backup Solution

   Copyright (C) 2000-2020 Kern Sibbald

   The original author of Bacula is Kern Sibbald, with contributions
   from many others, a complete list can be found in the file AUTHORS.

   You may use this file and others of this release according to the
   license defined in the LICENSE file, which includes the Affero General
   Public License, v3.0 ("AGPLv3") and some additional permissions and
   terms pursuant to its AGPLv3 Section 7.

   This notice must be preserved when any source code is
   conveyed and/or propagated.

   Bacula(R) is a registered trademark of Kern Sibbald.
*/
/*
 * Append code for Storage daemon
 *  Kern Sibbald, May MM
 */

#include "bacula.h"
#include "stored.h"


/* Responses sent to the File daemon */
static char OK_data[]    = "3000 OK data\n";
static char OK_append[]  = "3000 OK append data\n";

/* Forward referenced functions */


/*
 * Check if we can mark this job incomplete
 *
 */
void possible_incomplete_job(JCR *jcr, uint32_t last_file_index)
{
   BSOCK *dir = jcr->dir_bsock;
   /*
    * Note, here we decide if it is worthwhile to restart
    *  the Job at this point. For the moment, if at least
    *  10 Files have been seen.
    * We must be sure that the saved files are safe.
    * Using this function when there is as comm line problem is probably safe,
    *  it is inappropriate to use it for a any failure that could
    *  involve corrupted data.
    * We cannot mark a job Incomplete if we have already flushed
    *  a bad JobMedia record (i.e. one beyond the last FileIndex
    *  that is known to be good).
    */
   if (jcr->spool_attributes && last_file_index > 10 &&
       dir->get_lastFlushIndex() < last_file_index) {
      jcr->setJobStatus(JS_Incomplete);
   }
}

/*
 *  Append Data sent from Client (FD/SD)
 *
 */
bool do_append_data(JCR *jcr)
{
   int32_t n;
   int32_t file_index, stream, last_file_index;
   uint64_t stream_len;
   BSOCK *fd = jcr->file_bsock;
   bool ok = true;
   DEV_RECORD rec;
   char buf1[100], buf2[100];
   DCR *dcr = jcr->dcr;
   DEVICE *dev;
   char ec[50];
   POOLMEM *eblock = NULL;
   POOL_MEM errmsg(PM_EMSG);

   if (!dcr) {
      pm_strcpy(jcr->errmsg, _("DCR is NULL!!!\n"));
      Jmsg0(jcr, M_FATAL, 0, jcr->errmsg);
      return false;
   }
   dev = dcr->dev;
   if (!dev) {
      pm_strcpy(jcr->errmsg, _("DEVICE is NULL!!!\n"));
      Jmsg0(jcr, M_FATAL, 0, jcr->errmsg);
      return false;
   }

   Dmsg1(100, "Start append data. res=%d\n", dev->num_reserved());

   memset(&rec, 0, sizeof(rec));

   if (!fd->set_buffer_size(dcr->device->max_network_buffer_size, BNET_SETBUF_WRITE)) {
      jcr->setJobStatus(JS_ErrorTerminated);
      pm_strcpy(jcr->errmsg, _("Unable to set network buffer size.\n"));
      Jmsg0(jcr, M_FATAL, 0, jcr->errmsg);
      return false;
   }

   if (!acquire_device_for_append(dcr)) {
      jcr->setJobStatus(JS_ErrorTerminated);
      return false;
   }

   dev->start_of_job(dcr);
   jcr->sendJobStatus(JS_Running);

   Dmsg1(50, "Begin append device=%s\n", dev->print_name());

   begin_data_spool(dcr);
   begin_attribute_spool(jcr);

   /*
    * Write Begin Session Record
    */
   if (!write_session_label(dcr, SOS_LABEL)) {
      Jmsg1(jcr, M_FATAL, 0, _("Write session label failed. ERR=%s\n"),
         dev->bstrerror());
      jcr->setJobStatus(JS_ErrorTerminated);
      ok = false;
   }

   /* Tell File daemon to send data */
   if (!fd->fsend(OK_data)) {
      berrno be;
      Jmsg1(jcr, M_FATAL, 0, _("Network send error to FD. ERR=%s\n"),
            be.bstrerror(fd->b_errno));
      ok = false;
   }

   /*
    * Get Data from File daemon, write to device.  To clarify what is
    *   going on here.  We expect:
    *     - A stream header
    *     - Multiple records of data
    *     - EOD record
    *
    *    The Stream header is just used to synchronize things, and
    *    none of the stream header is written to tape.
    *    The Multiple records of data, contain first the Attributes,
    *    then after another stream header, the file data, then
    *    after another stream header, the MD5 data if any.
    *
    *   So we get the (stream header, data, EOD) three time for each
    *   file. 1. for the Attributes, 2. for the file data if any,
    *   and 3. for the MD5 if any.
    */
   dcr->VolFirstIndex = dcr->VolLastIndex = 0;
   jcr->run_time = time(NULL);              /* start counting time for rates */

   GetMsg *qfd;

   qfd = New(GetMsg(jcr, fd, NULL, GETMSG_MAX_MSG_SIZE));
   qfd->start_read_sock();

   for (last_file_index = 0; ok && !jcr->is_job_canceled(); ) {

      /* Read Stream header from the File daemon.
       *  The stream header consists of the following:
       *    file_index (sequential Bacula file index, base 1)
       *    stream     (Bacula number to distinguish parts of data)
       *    stream_len (Expected length of this stream. This
       *       will be the size backed up if the file does not
       *       grow during the backup.
       */
      n = qfd->bget_msg(NULL);
      if (n <= 0) {
         if (n == BNET_SIGNAL && qfd->msglen == BNET_EOD) {
            Dmsg0(200, "Got EOD on reading header.\n");
            break;                    /* end of data */
         }
         Jmsg3(jcr, M_FATAL, 0, _("Error reading data header from FD. n=%d msglen=%d ERR=%s\n"),
               n, qfd->msglen, fd->bstrerror());
         // ASX TODO the fd->bstrerror() can be related to the wrong error, I should Queue the error too
         possible_incomplete_job(jcr, last_file_index);
         ok = false;
         break;
      }

      if (sscanf(qfd->msg, "%ld %ld %lld", &file_index, &stream, &stream_len) != 3) {
         // TODO ASX already done in bufmsg, should reuse the values
         char buf[256];
         Jmsg1(jcr, M_FATAL, 0, _("Malformed data header from FD: %s\n"), asciidump(qfd->msg, qfd->msglen, buf, sizeof(buf)));
         ok = false;
         possible_incomplete_job(jcr, last_file_index);
         break;
      }

      Dmsg3(890, "<filed: Header FilInx=%d stream=%d stream_len=%lld\n",
         file_index, stream, stream_len);

      /*
       * We make sure the file_index is advancing sequentially.
       * An incomplete job can start the file_index at any number.
       * otherwise, it must start at 1.
       */
      if (jcr->rerunning && file_index > 0 && last_file_index == 0) {
         goto fi_checked;
      }
      Dmsg2(400, "file_index=%d last_file_index=%d\n", file_index, last_file_index);
      if (file_index > 0 && (file_index == last_file_index ||
          file_index == last_file_index + 1)) {
         goto fi_checked;
      }
      Jmsg2(jcr, M_FATAL, 0, _("FI=%d from FD not positive or last_FI=%d\n"),
            file_index, last_file_index);
      possible_incomplete_job(jcr, last_file_index);
      ok = false;
      break;

fi_checked:
      if (file_index != last_file_index) {
         jcr->JobFiles = file_index;
         last_file_index = file_index;
      }

      /* Read data stream from the File daemon.
       *  The data stream is just raw bytes
       */
      while ((n=qfd->bget_msg(NULL)) > 0 && !jcr->is_job_canceled()) {

         rec.VolSessionId = jcr->VolSessionId;
         rec.VolSessionTime = jcr->VolSessionTime;
         rec.FileIndex = file_index;
         rec.Stream = stream;
         rec.StreamLen = stream_len;
         rec.maskedStream = stream & STREAMMASK_TYPE;   /* strip high bits */
         rec.data_len = qfd->msglen;
         rec.data = qfd->msg;            /* use message buffer */

         /* Debug code: check if we must hangup or blowup */
         if (handle_hangup_blowup(jcr, jcr->JobFiles, jcr->JobBytes)) {
            return false;
         }
         Dmsg4(850, "before writ_rec FI=%d SessId=%d Strm=%s len=%d\n",
            rec.FileIndex, rec.VolSessionId,
            stream_to_ascii(buf1, rec.Stream,rec.FileIndex),
            rec.data_len);
         ok = dcr->write_record(&rec);
         if (!ok) {
            Dmsg2(90, "Got write_block_to_dev error on device %s. %s\n",
                  dcr->dev->print_name(), dcr->dev->bstrerror());
            break;
         }
         jcr->JobBytes += rec.data_len;   /* increment bytes this job */
         jcr->JobBytes += qfd->bmsg->jobbytes; // if the block as been downloaded, count it
         Dmsg4(850, "write_record FI=%s SessId=%d Strm=%s len=%d\n",
            FI_to_ascii(buf1, rec.FileIndex), rec.VolSessionId,
            stream_to_ascii(buf2, rec.Stream, rec.FileIndex), rec.data_len);

         send_attrs_to_dir(jcr, &rec);
         Dmsg0(650, "Enter bnet_get\n");
      }
      Dmsg2(650, "End read loop with FD. JobFiles=%d Stat=%d\n", jcr->JobFiles, n);

      if (fd->is_error()) {
         if (!jcr->is_job_canceled()) {
            Dmsg1(350, "Network read error from FD. ERR=%s\n", fd->bstrerror());
            Jmsg1(jcr, M_FATAL, 0, _("Network error reading from FD. ERR=%s\n"),
                  fd->bstrerror());
            possible_incomplete_job(jcr, last_file_index);
         }
         ok = false;
         break;
      }
   }

   qfd->wait_read_sock((ok == false) || jcr->is_job_canceled());
   free_GetMsg(qfd);

   if (eblock != NULL) {
      free_pool_memory(eblock);
   }

   /* Create Job status for end of session label */
   jcr->setJobStatus(ok?JS_Terminated:JS_ErrorTerminated);

   if (ok) {
      /* Terminate connection with Client */
      fd->fsend(OK_append);
      do_client_commands(jcr);            /* finish dialog with Client */
   } else {
      fd->fsend("3999 Failed append\n");
   }

   Dmsg1(200, "Write EOS label JobStatus=%c\n", jcr->JobStatus);

   /*
    * Check if we can still write. This may not be the case
    *  if we are at the end of the tape or we got a fatal I/O error.
    */
   dcr->set_ameta();
   if (ok || dev->can_write()) {
      if (!dev->flush_before_eos(dcr)) {
         /* Print only if ok and not cancelled to avoid spurious messages */
         if (ok && !jcr->is_job_canceled()) {
            Jmsg2(jcr, M_FATAL, 0, _("Fatal append error on device %s: ERR=%s\n"),
                  dev->print_name(), dev->bstrerror());
            Dmsg0(100, _("Set ok=FALSE after write_block_to_device.\n"));
            possible_incomplete_job(jcr, last_file_index);
         }
         jcr->setJobStatus(JS_ErrorTerminated);
         ok = false;
      }
      if (!write_session_label(dcr, EOS_LABEL)) {
         /* Print only if ok and not cancelled to avoid spurious messages */
         if (ok && !jcr->is_job_canceled()) {
            Jmsg1(jcr, M_FATAL, 0, _("Error writing end session label. ERR=%s\n"),
                  dev->bstrerror());
            possible_incomplete_job(jcr, last_file_index);
         }
         jcr->setJobStatus(JS_ErrorTerminated);
         ok = false;
      }
      /* Flush out final partial block of this session */
      Dmsg1(200, "=== Flush adata=%d last block.\n", dcr->block->adata);
      ASSERT(!dcr->block->adata);
      if (!dcr->write_final_block_to_device()) {
         /* Print only if ok and not cancelled to avoid spurious messages */
         if (ok && !jcr->is_job_canceled()) {
            Jmsg2(jcr, M_FATAL, 0, _("Fatal append error on device %s: ERR=%s\n"),
                  dev->print_name(), dev->bstrerror());
            Dmsg0(100, _("Set ok=FALSE after write_final_block_to_device.\n"));
            possible_incomplete_job(jcr, last_file_index);
         }
         jcr->setJobStatus(JS_ErrorTerminated);
         ok = false;
      }
   }
   flush_jobmedia_queue(jcr);
   if (!ok && !jcr->is_JobStatus(JS_Incomplete)) {
      discard_data_spool(dcr);
   } else {
      /* Note: if commit is OK, the device will remain blocked */
      commit_data_spool(dcr);
   }

   /*
    * Don't use time_t for job_elapsed as time_t can be 32 or 64 bits,
    *   and the subsequent Jmsg() editing will break
    */
   int32_t job_elapsed = time(NULL) - jcr->run_time;

   if (job_elapsed <= 0) {
      job_elapsed = 1;
   }

   Jmsg(dcr->jcr, M_INFO, 0, _("Elapsed time=%02d:%02d:%02d, Transfer rate=%s Bytes/second\n"),
         job_elapsed / 3600, job_elapsed % 3600 / 60, job_elapsed % 60,
         edit_uint64_with_suffix(jcr->JobBytes / job_elapsed, ec));

   /*
    * Release the device -- and send final Vol info to DIR
    *  and unlock it.
    */
   release_device(dcr);

   if ((!ok || jcr->is_job_canceled()) && !jcr->is_JobStatus(JS_Incomplete)) {
      discard_attribute_spool(jcr);
   } else {
      commit_attribute_spool(jcr);
   }

   jcr->sendJobStatus();          /* update director */

   Dmsg1(100, "return from do_append_data() ok=%d\n", ok);
   return ok;
}


/* Send attributes and digest to Director for Catalog */
bool send_attrs_to_dir(JCR *jcr, DEV_RECORD *rec)
{
   if (rec->maskedStream == STREAM_UNIX_ATTRIBUTES    ||
       rec->maskedStream == STREAM_UNIX_ATTRIBUTES_EX ||
       rec->maskedStream == STREAM_RESTORE_OBJECT     ||
       crypto_digest_stream_type(rec->maskedStream) != CRYPTO_DIGEST_NONE) {
      if (!jcr->no_attributes) {
         BSOCK *dir = jcr->dir_bsock;
         if (are_attributes_spooled(jcr)) {
            dir->set_spooling();
         }
         Dmsg1(850, "Send attributes to dir. FI=%d\n", rec->FileIndex);
         if (!dir_update_file_attributes(jcr->dcr, rec)) {
            Jmsg(jcr, M_FATAL, 0, _("Error updating file attributes. ERR=%s\n"),
               dir->bstrerror());
            dir->clear_spooling();
            return false;
         }
         dir->clear_spooling();
      }
   }
   return true;
}