/*

  Copyright 2009 Nathan Phillip Brink, Ethan Zonca, Matthew Orlando

  This file is a part of DistRen.

  DistRen is free software: you can redistribute it and/or modify

  it under the terms of the GNU Affero General Public License as published by

  the Free Software Foundation, either version 3 of the License, or

  (at your option) any later version.

  DistRen is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  GNU Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License

  along with DistRen.  If not, see <http://www.gnu.org/licenses/>.

*/

 /*

  * Registration on server. Needs attention. Prevent account spamming.

  * distrenslave -c username email@example.com

 */

#include "blendjob.h"

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#include <stdlib.h> /*< malloc(), free() */

int ssh_keygen(){

	fprintf(stderr, "We're generating your SSH key. Please be patient.\n");

	int ret;

	ret = execv(path_to_command, cmd); // This path will be absolute for testing, should be relative to install on production

	if(ret == -1){

		fprintf(stderr, "Generating your key failed. Ensure that ssh-keygen is present!\n"); // Use different executor that searches the path? there is one...

		return 0;

	}

	else{

		fprintf(stderr,"We successfully generated your key! Yay!");

		return 1;

	}

return 0;

}

int register_user(char *username, char *email)

{

  /*

   * Logs into sandboxed user on zserver2 and registers a user. Should eventually generate a key on the server and return it to the user.

   * All created user accounts should be sandboxed accordingly, requiring a different skel, and the default shell to be rbash. Also,

   * a custom path defined in the .bash_profile of the skel is needed.

   */

  char buf[10];

  struct execio *testrem;

  char *execargv[] =

    {

      "ssh",

      "distren_setup@protofusion.org",

      "-i",

      "setup.rsa", // default distributed key, account can only create users.

      "-p",

      "23",

      "sudo /usr/sbin/useradd",

      "-M",

      "-c",

      email,

      "-d",

      "/home/distren",

      "--gid",

      "541", // Add in shellscript to generate ssh key and set keyname

      username,

      (char *)NULL

    };

  size_t readlen;

  fprintf(stderr, "Opening stream:\n", execio_open(&testrem, "ssh", execargv));

  buf[9] = '\0'; // null-terminating the array...

  while(!execio_read(testrem, buf, 9, &readlen)) // What's with the readlen stuff?

    {

      if(readlen > 9) {

	fprintf(stderr, "!!!! Something is terribly wrong!\n");

      }

      buf[readlen] = '\0'; // Null-terminating the end of it again based on how large the data is?

      fprintf(stderr, "read \"%s\"\n", buf);

    }

  execio_close(testrem);

  ssh_keygen(); // generates username.rsa

  /* TODO: Scan distrenslave.conf for !username and !key and replace them with "keyname" and the "username" */

  return 1;

}

int login_user(char *username)

{

  char *userhost;

  char *userkey;

  char buf[10];

  struct execio *testrem;

  char *execargv[] =

    {

      "ssh",

      "-i",

      (char *)NULL, // Key created from registeruser()

      "-p",

      "23",

      (char *)NULL,// username and hostname

      "echo",

      "hello", // This should eventually open a non-terminating connection to the server for communication,

      (char *)NULL

    };

  size_t readlen;

  /*< @TODO remove being tied to protofusion.org for no reason  */

  userhost = malloc(strlen(username) + strlen("@protofusion.org") + 1);

  if(!userhost)

    return 43;

  strcpy(userhost, username);

  strcat(userhost, "@protofusion.org"); // Throws @protofusion.org after the username

  userkey = malloc(strlen(username) + strlen(".rsa") + 1);

  if(!userkey)

    {

      free(userhost);

      return 44;

    }

  strcpy(userkey, username);

  strcat(userkey,".rsa");

  fprintf(stderr, "Logging you in to %s using key %s\n", userhost, userkey);

  if(fopen(userkey, "r") == NULL){

	  fprintf(stderr,"Your key, %s, has not been found! Re-register or somehow regenerate your key! We need a way to regenerate keys coded in, but we don't have the facilities yet!",userkey);

	  return 0;

  }

  fprintf(stderr, "Opening stream:\n", execio_open(&testrem, "ssh", execargv));

  buf[9] = '\0'; // null-terminating the array...

  while(!execio_read(testrem, buf, 9, &readlen)) // What's with the readlen stuff?

    {

      if(readlen > 9) {

	fprintf(stderr, "!!!! Something is terribly wrong!\n");

      }

    buf[readlen] = '\0'; // Null-terminating the end of it again based on how large the data is?

    fprintf(stderr, "read \"%s\"\n", buf);

    }

  execio_close(testrem);

  return 1; // 1 can be like... error-free login...

}

/* Replaces username and key in the slave's conf file, currently pseudo */

void conf_replace(char *username, char *key){

	// Doesn't delete anything! :D

/*

	mktemp(); // Gets a new file to put data into

	fopen('w'); // Open the file we created in write mode

	fopen('r'); // Open the conf file in read-only mode

	read(); // Read the created file, scanning for and replacing strings, whie

	writ(); // writing out to the newly created file

	fsync(); // fsync the file we wrote data to

	rename(); // rename the old file to the new file

*/

}

/* Executors */

/*

  It seems that the client will need to know the job number. fixme.

*/

void exec_blender(struct blendjob* blendjob, char *input, char *output, int frame)

{

  char *frame_str;

  asprintf(frame,frame_str); // GNU/*nix compatible only, fix before releasing win32, although dll for windows for asprintf exists!

  int ret;

  char *cmd[] = { "blender", "-b", "-o", output, input, "-f", frame_str, (char *)0 };

  ret = execv("/usr/bin/blender", cmd); // This path will be absolute for testing, should be relative to install on production

}