/*
 * Copyright (c) 1998,1999,2000
 *      Traakan, Inc., Los Altos, CA
 *      All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice unmodified, this list of conditions, and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Project:  NDMJOB
 * Ident:    $Id: $
 *
 * Description:
 *
 */


#include "ndmagents.h"

#ifndef NDMOS_OPTION_NO_DATA_AGENT


int ndmda_pipe_fork_exec(struct ndm_session* sess, char* cmd, int is_backup)
{
  struct ndm_data_agent* da = sess->data_acb;
  struct ndmchan* ch;
  int errpipe[2];
  int datpipe[2];
  int wrppipe[2];
  int nullfd;
  int rc = -1;

  ndmalogf(sess, 0, 2, "Starting %s", cmd);

  nullfd = open("/dev/null", 2);
  if (nullfd < 0) { return rc; }

  rc = pipe(errpipe);
  if (rc < 0) {
    close(nullfd);
    return rc;
  }

  rc = pipe(datpipe);
  if (rc < 0) {
    close(nullfd);
    close(errpipe[0]);
    close(errpipe[1]);
    return rc;
  }

  rc = pipe(wrppipe);
  if (rc < 0) {
    close(nullfd);
    close(errpipe[0]);
    close(errpipe[1]);
    close(datpipe[0]);
    close(datpipe[1]);
    return rc;
  }

  rc = fork();
  if (rc < 0) {
    close(nullfd);
    close(errpipe[0]);
    close(errpipe[1]);
    close(datpipe[0]);
    close(datpipe[1]);
    close(wrppipe[0]);
    close(wrppipe[1]);
    return rc;
  }

  if (rc == 0) {
    /* child */
    dup2(errpipe[1], 2);
    dup2(wrppipe[1], 3);
    close(errpipe[0]);
    close(wrppipe[0]);

    if (is_backup) {
      dup2(nullfd, 0);
      dup2(datpipe[1], 1);
      close(datpipe[0]);
    } else {
      dup2(datpipe[0], 0);
      dup2(nullfd, 1);
      close(datpipe[1]);
    }

    /*
     * 0 -- formatter stdin
     * 1 -- formatter stdout
     * 2 -- formatter stderr
     * 3 -- formatter wrap chan (wraplib.c)
     */
    for (rc = 4; rc < 100; rc++) { close(rc); }

    execl("/bin/sh", "sh", "-c", cmd, NULL);

    fprintf(stderr, "EXEC FAILED %s\n", cmd);
    exit(127);
  }

  /* parent */
  close(nullfd);

  ch = &da->formatter_error;
  ndmchan_initialize(ch, "dfp-error");
  da->fmt_error_buf = NDMOS_API_MALLOC(NDMDA_N_FMT_ERROR_BUF);
  if (!da->fmt_error_buf) return -1;
  ndmchan_setbuf(ch, da->fmt_error_buf, NDMDA_N_FMT_ERROR_BUF);
  close(errpipe[1]);
  ndmos_condition_pipe_fd(sess, errpipe[0]);
  ndmchan_start_read(ch, errpipe[0]);

  ch = &da->formatter_wrap;
  ndmchan_initialize(ch, "dfp-wrap");
  da->fmt_wrap_buf = NDMOS_API_MALLOC(NDMDA_N_FMT_WRAP_BUF);
  if (!da->fmt_wrap_buf) return -1;
  ndmchan_setbuf(ch, da->fmt_wrap_buf, NDMDA_N_FMT_WRAP_BUF);
  close(wrppipe[1]);
  ndmos_condition_pipe_fd(sess, wrppipe[0]);
  ndmchan_start_read(ch, wrppipe[0]);

  ch = &da->formatter_image;
  ndmchan_initialize(ch, "dfp-image");
  da->fmt_image_buf = NDMOS_API_MALLOC(NDMDA_N_FMT_IMAGE_BUF);
  if (!da->fmt_image_buf) return -1;
  ndmchan_setbuf(ch, da->fmt_image_buf, NDMDA_N_FMT_IMAGE_BUF);

  if (is_backup) {
    ndmalogf(sess, 0, 2, "backup...");
    close(datpipe[1]);
    ndmos_condition_pipe_fd(sess, datpipe[0]);
    ndmchan_start_read(ch, datpipe[0]);
  } else {
    ndmalogf(sess, 0, 2, "recover...");
    close(datpipe[0]);
    ndmos_condition_pipe_fd(sess, datpipe[1]);
    ndmchan_start_write(ch, datpipe[1]);
  }

  da->formatter_pid = rc;

  return rc; /* PID */
}

int ndmda_add_to_cmd_with_escapes(char* cmd, char* word, char* special)
{
  char* cmd_lim = &cmd[NDMDA_MAX_CMD - 3];
  char* p;
  int c;

  p = cmd;
  while (*p) p++;
  if (p != cmd) *p++ = ' ';

  while ((c = *word++) != 0) {
    if (p >= cmd_lim) return -1; /* overflow */
    if (c == '\\' || strchr(special, c)) *p++ = '\\';
    *p++ = c;
  }
  *p = 0;

  return 0;
}

int ndmda_add_to_cmd(char* cmd, char* word)
{
  return ndmda_add_to_cmd_with_escapes(cmd, word, " \t`'\"*?[]$");
}

int ndmda_add_to_cmd_allow_file_wildcards(char* cmd, char* word)
{
  return ndmda_add_to_cmd_with_escapes(cmd, word, " \t`'\"$");
}

#endif /* !NDMOS_OPTION_NO_DATA_AGENT */
