construct/modules/m_whowas.cc

/*
 *  ircd-ratbox: A slightly useful ircd.
 *  m_whois.c: Shows who a user was.
 *
 *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
 *  Copyright (C) 1996-2002 Hybrid Development Team
 *  Copyright (C) 2002-2005 ircd-ratbox development team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 */

using namespace ircd;

static const char whowas_desc[] =
	"Provides the WHOWAS command to display information on a disconnected user";

static void m_whowas(struct MsgBuf *, client::client &, client::client &, int, const char **);

struct Message whowas_msgtab = {
	"WHOWAS", 0, 0, 0, 0,
	{mg_unreg, {m_whowas, 2}, {m_whowas, 4}, mg_ignore, mg_ignore, {m_whowas, 2}}
};

mapi_clist_av1 whowas_clist[] = { &whowas_msgtab, NULL };

DECLARE_MODULE_AV2(whowas, NULL, NULL, whowas_clist, NULL, NULL, NULL, NULL, whowas_desc);

/*
** m_whowas
**      parv[1] = nickname queried
*/
static void
m_whowas(struct MsgBuf *msgbuf_p, client::client &client, client::client &source, int parc, const char *parv[])
{
	rb_dlink_list *whowas_list;
	rb_dlink_node *ptr;
	int cur = 0;
	int max = -1;
	char *p;
	const char *nick;
	char tbuf[26];
	long sendq_limit;

	static time_t last_used = 0L;

	if(my(source) && !is(source, umode::OPER))
	{
		if(last_used + (parc > 3 ? ConfigFileEntry.pace_wait :
						ConfigFileEntry.pace_wait_simple
				) > rb_current_time())
		{
			sendto_one(&source, form_str(RPL_LOAD2HI),
				   me.name, source.name, "WHOWAS");
			sendto_one_numeric(&source, RPL_ENDOFWHOWAS, form_str(RPL_ENDOFWHOWAS),
				   parv[1]);
			return;
		}
		else
			last_used = rb_current_time();
	}


	if(parc > 2)
		max = atoi(parv[2]);

	if(parc > 3)
		if(hunt_server(&client, &source, ":%s WHOWAS %s %s :%s", 3, parc, parv))
			return;

	if(!my(source) && (max <= 0 || max > 20))
		max = 20;

	if((p = (char *)strchr(parv[1], ',')))
		*p = '\0';

	nick = parv[1];

	sendq_limit = get_sendq(&client) * 9 / 10;
	const auto history(whowas::history(nick));
	if(history.empty())
	{
		sendto_one_numeric(&source, ERR_WASNOSUCHNICK, form_str(ERR_WASNOSUCHNICK), nick);
		sendto_one_numeric(&source, RPL_ENDOFWHOWAS, form_str(RPL_ENDOFWHOWAS), parv[1]);
		return;
	}

	for(const auto &ww : history)
	{
		if(cur > 0 && rb_linebuf_len(&client.localClient->buf_sendq) > sendq_limit)
		{
			sendto_one(&source, form_str(ERR_TOOMANYMATCHES),
			           me.name,
			           source.name,
			           "WHOWAS");
			break;
		}

		sendto_one(&source, form_str(RPL_WHOWASUSER),
		           me.name,
		           source.name,
		           ww->name,
		           ww->username,
		           ww->hostname,
		           ww->realname);

		if(!EmptyString(ww->sockhost) && strcmp(ww->sockhost, "0") && show_ip_whowas(*ww, source))
			sendto_one_numeric(&source, RPL_WHOISACTUALLY, form_str(RPL_WHOISACTUALLY),
			                   ww->name,
			                   ww->sockhost);

		if(!EmptyString(ww->suser))
			sendto_one_numeric(&source, RPL_WHOISLOGGEDIN, "%s %s :was logged in as",
			                   ww->name,
			                   ww->suser);

		sendto_one_numeric(&source, RPL_WHOISSERVER, form_str(RPL_WHOISSERVER),
		                   ww->name,
		                   ww->scache? name(*ww->scache).c_str() : "*",
		                   rb_ctime(ww->logoff, tbuf, sizeof(tbuf)));

		cur++;
		if(max > 0 && cur >= max)
			break;
	}

	sendto_one_numeric(&source, RPL_ENDOFWHOWAS, form_str(RPL_ENDOFWHOWAS), parv[1]);
}