How I dealt with Multiplaying

Bored of checking the 'user' command everytime someone logins on, just to
make sure they aren't sharing equipment/items? Heres what I did to stop
people.  Whats so special about this? It allows you to set a maximum amount
of connections from a single host.

** Disclaimer **
This worked for me, and should work for you. If it kills your mud do not
blame me, because its not my fault  :)

This is nice and basic.

Firstly lets define the plr_flag.
Open structs.h
and search for:

#define PLR_

at the bottom of that list add:

#define PLR_MULTIPLAYER   (1 >> XX) // XX should be one number higher than PLR_ above

Next, at the top of interpreter.c look for the external ints and just below
the last one add:

int multi_play_limit = 2;

Then go down to nanny(), at the top you will need to add some bits.
Look for:

struct descriptor_data *pt;

and change it to:

struct descriptor_data *pt, *k, *next_k;

and just below that you should see:

int player_i, load_result;

and change that to:

int player_i, load_result, connections=0;

further on down you should see this bit of the WizLock code:

  if (GET_LEVEL(d->character) < circle_restrict) {
    SEND_TO_Q("The game is temporarily restricted.. try again later.\r\n", d);
    STATE(d) = CON_CLOSE;
    sprintf(buf, "Request for login denied for %s [%s] (wizlock)",
      GET_NAME(d->character), d->host);
    mudlog(buf, NRM, LVL_GOD, TRUE);
    return;
  }

then below it just add:

  //BoxBoy: Multiplay checking (d->host)
  for (k = descriptor_list; k; k = next_k) {
    next_k = k->next;
    if (!strcasecmp(k->host, d->host)) {
      connections++;
      if(connections > multi_play_limit && !PLR_FLAGGED(d->character, PLR_MULTIPLAYER)) {
        SEND_TO_Q("No more connections from your server, max multiplay limit reached.\r\n", d);
        STATE(d) = CON_CLOSE;
        sprintf(buf, "Max Multiplayer Limit Reached by [%s]", d->host);
        mudlog(buf, NRM, LVL_GOD, TRUE);
        return;
      }
    }
  }
  //BoxBoy: End Multiplay Checks

and thats it.

I actually put multi_play_limit in my config.c and then put an extern at the
top of the file but it seemed simpler to do it like this.

** Setting the Multiplayer Flag

Just in case anyone is wondering about how to set the plr_multiplayer flag,
I did this using the do_set command. If you don't know how to add things to
do_set I have written it below.

search for this in act.wizard.c:
  { "weight",		LVL_GOD,	BOTH,	NUMBER },  /* 50 */

If there is any other lines like this directly below keep going down until
you reach the line which looks like:
  { "", 0, BOTH, MISC }

and above that add:
  { "multiplayer", LVL_GRGOD,		PC,		BINARY },

then move down to:
  default:
    send_to_char("Can't set that!\n\r", ch);
    return (0);

and above that add this above it:
  case 69:
	SET_OR_REMOVE(PLR_FLAGS(vict), PLR_MULTIPLAYER);
	send_to_char("Muliplayer Flag set.", ch);
	sprintf(buf, "(GC) %s set Multiplayer Flag on %s", GET_NAME(ch), GET_NAME(vict));
	mudlog(buf, NRM, LVL_GRGOD, TRUE);
	break;

make sure the case number is one number higher than the case above. I believe
thats about it (don't forget to update the help set in your library files)

BoxBoy
(Dimensia will hopefully be up full time soon.)
mud.guam.net 6000
http://dimensia.iwarp.com/