/*

 * **********************************************************************************

 * Slave functions / etc resides below. Wouldn't a seperate file make this easier??

 *

 * Slave listens on server for a command in the format of each function...

 * We need if's for returns... ==> watchdog

 * **********************************************************************************

*/

///////////////////// Semi-pseudo Slave Code ///////////////////////////

/*

int slavestatus = 0;

if(no username in config file, no key present){

	fprintf(stderr "run distrend -c username] [emailaddr] to register")

}

if(they use a -c flag according to getopt, with 2 args){

	register_user(username, email); which returns a uniquely random url to a key

	get(uniquely-random-url-to-key);

	fprintf(stderr, "you registered, hopefully successfully. Invoke distrend with no args now.");

}

if(username is in conf file and key is present){

	loginuser(username);

}

if(slave recieves "start frame#, job#"){

	get(http://distren.protofusion.org/srv/job#.tgz);

	tar -xvf job#.tgz /tmp/distren/job#; somehow

	exec_blender(job#.blend, job#.frame#.JPG, job#); (check the args, we'll need to adjust for different output formats)... set SLAVESTATUS=1 while rendering, SLAVESTATUS=2 when done

}

if(SLAVESTATUS==2){

	tell the server "done with frame# in job#";

	SLAVESTATUS=0

}

if(SLAVESTATUS==0){

	tell the server "i ain't got no frames to render";

}

while(SLAVESTATUS==1){

	tell the server "rendering this friggn frame";

	delay(1000);

}

*/

////////////////////////////////////////////////////////////////////////

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

// Key transfer?

// Set up something like: distrend -c username email@example.com

void registeruser(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 return it to the user somehow

  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);

}

void loginuser(char *username){

  // Logs into sandboxed user on zserver2 as a client, currently does nothing

  char buf[10];

  struct execio *testrem;

  char *execargv[] =

    {

  "ssh",

  "username@protofusion.org", // username must be read from the conf

  "-i",

  "username.rsa", // Key created from registeruser()

  "-p",

  "23",

  "echo",

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

  (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);

}

// Executors

/*

  It seems that the client will need to know the job number. Is finish_frame going to be on the client or the server? we gotta figure that out!

*/

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);

  finish_frame(blendjob, frame);

}