/*
  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");
	char *command = "ssh-keygenn"; // append .exe if win32?
	char *path_to_command = "/usr/bin/ssh-keygenn";
	int ret;
	char *cmd[] = { command, "-b", "-o", (char *)0 }; // TODO: Give me the correct args!
	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
}