392 lines
10 KiB
C
392 lines
10 KiB
C
/*
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* charybdis: An advanced ircd.
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* m_list_safelist.c: Version of /list that uses the safelist code.
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*
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* Copyright (c) 2006 William Pitcock <nenolod@nenolod.net>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: m_list.c 3372 2007-04-03 10:18:07Z nenolod $
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*/
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#include "stdinc.h"
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#include "tools.h"
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#include "channel.h"
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#include "client.h"
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#include "hash.h"
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#include "irc_string.h"
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#include "ircd.h"
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#include "numeric.h"
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#include "s_conf.h"
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#include "s_serv.h"
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#include "send.h"
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#include "msg.h"
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#include "parse.h"
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#include "modules.h"
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#include "event.h"
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static dlink_list safelisting_clients = { NULL, NULL, 0 };
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static int _modinit(void);
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static void _moddeinit(void);
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static int m_list(struct Client *, struct Client *, int, const char **);
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static int mo_list(struct Client *, struct Client *, int, const char **);
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static void safelist_check_cliexit(hook_data_client_exit * hdata);
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static void safelist_client_instantiate(struct Client *, struct ListClient *);
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static void safelist_client_release(struct Client *);
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static void safelist_one_channel(struct Client *source_p, struct Channel *chptr);
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static void safelist_iterate_client(struct Client *source_p);
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static void safelist_iterate_clients(void *unused);
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static void safelist_channel_named(struct Client *source_p, const char *name);
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struct Message list_msgtab = {
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"LIST", 0, 0, 0, MFLG_SLOW,
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{mg_unreg, {m_list, 0}, mg_ignore, mg_ignore, mg_ignore, {mo_list, 0}}
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};
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mapi_clist_av1 list_clist[] = { &list_msgtab, NULL };
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mapi_hfn_list_av1 list_hfnlist[] = {
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{"client_exit", (hookfn) safelist_check_cliexit},
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{NULL, NULL}
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};
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DECLARE_MODULE_AV1(list, _modinit, _moddeinit, list_clist, NULL, list_hfnlist, "$Revision: 3372 $");
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static int _modinit(void)
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{
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eventAdd("safelist_iterate_clients", safelist_iterate_clients, NULL, 3);
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return 0;
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}
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static void _moddeinit(void)
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{
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eventDelete(safelist_iterate_clients, NULL);
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}
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static void safelist_check_cliexit(hook_data_client_exit * hdata)
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{
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/* Cancel the safelist request if we are disconnecting
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* from the server. That way it doesn't core. :P --nenolod
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*/
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if (MyClient(hdata->target) && hdata->target->localClient->safelist_data != NULL)
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{
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safelist_client_release(hdata->target);
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}
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}
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/* m_list()
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* parv[0] = sender prefix
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* parv[1] = channel
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*
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* XXX - With SAFELIST, do we really need to continue pacing?
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* In theory, the server cannot be lagged by this. --nenolod
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*/
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static int m_list(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
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{
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static time_t last_used = 0L;
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if (source_p->localClient->safelist_data != NULL)
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{
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sendto_one_notice(source_p, ":/LIST aborted");
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sendto_one(source_p, form_str(RPL_LISTEND), me.name, source_p->name);
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safelist_client_release(source_p);
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return 0;
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}
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if (parc < 2 || !IsChannelName(parv[1]))
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{
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/* pace this due to the sheer traffic involved */
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if (((last_used + ConfigFileEntry.pace_wait) > CurrentTime))
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{
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sendto_one(source_p, form_str(RPL_LOAD2HI), me.name, source_p->name, "LIST");
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sendto_one(source_p, form_str(RPL_LISTEND), me.name, source_p->name);
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return 0;
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}
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else
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last_used = CurrentTime;
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}
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return mo_list(client_p, source_p, parc, parv);
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}
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/* mo_list()
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* parv[0] = sender prefix
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* parv[1] = channel
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*/
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static int mo_list(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
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{
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struct ListClient params;
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char *p, *args;
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int i;
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if (source_p->localClient->safelist_data != NULL)
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{
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sendto_one_notice(source_p, ":/LIST aborted");
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sendto_one(source_p, form_str(RPL_LISTEND), me.name, source_p->name);
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safelist_client_release(source_p);
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return 0;
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}
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/* XXX rather arbitrary -- jilles */
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params.users_min = 3;
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params.users_max = INT_MAX;
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if (parc > 1 && parv[1] != NULL && !IsChannelName(parv[1]))
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{
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args = LOCAL_COPY(parv[1]);
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/* Make any specification cancel out defaults */
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if (*args == '<')
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params.users_min = 0;
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for (i = 0; i < 2; i++)
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{
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if ((p = strchr(args, ',')) != NULL)
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*p++ = '\0';
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if (*args == '<')
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{
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args++;
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if (IsDigit(*args))
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{
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params.users_max = atoi(args);
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if (params.users_max == 0)
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params.users_max = INT_MAX;
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else
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params.users_max--;
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}
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else
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params.users_max = INT_MAX;
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}
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else if (*args == '>')
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{
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args++;
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if (IsDigit(*args))
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params.users_min = atoi(args) + 1;
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else
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params.users_min = 0;
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}
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if (EmptyString(p))
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break;
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else
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args = p;
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}
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}
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else if (parc > 1 && IsChannelName(parv[1]))
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{
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safelist_channel_named(source_p, parv[1]);
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return 0;
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}
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safelist_client_instantiate(source_p, ¶ms);
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return 0;
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}
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/*
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* safelist_sendq_exceeded()
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*
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* inputs - pointer to client that needs checking
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* outputs - 1 if a client has exceeded the reserved
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* sendq limit, 0 if not
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* side effects - none
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*
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* When safelisting, we only use half of the SendQ at any
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* given time.
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*/
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static int safelist_sendq_exceeded(struct Client *client_p)
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{
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if (linebuf_len(&client_p->localClient->buf_sendq) > (get_sendq(client_p) / 2))
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return YES;
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else
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return NO;
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}
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/*
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* safelist_client_instantiate()
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*
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* inputs - pointer to Client to be listed,
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* struct ListClient to copy for params
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* outputs - none
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* side effects - the safelist process begins for a
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* client.
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*
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* Please do not ever call this on a non-local client.
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* If you do, you will get SIGSEGV.
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*/
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static void safelist_client_instantiate(struct Client *client_p, struct ListClient *params)
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{
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struct ListClient *self;
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s_assert(MyClient(client_p));
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s_assert(params != NULL);
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self = MyMalloc(sizeof(struct ListClient));
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self->hash_indice = 0;
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self->users_min = params->users_min;
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self->users_max = params->users_max;
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client_p->localClient->safelist_data = self;
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sendto_one(client_p, form_str(RPL_LISTSTART), me.name, client_p->name);
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/* pop the client onto the queue for processing */
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dlinkAddAlloc(client_p, &safelisting_clients);
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/* give the user some initial data to work with */
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safelist_iterate_client(client_p);
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}
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/*
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* safelist_client_release()
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*
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* inputs - pointer to Client being listed on
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* outputs - none
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* side effects - the client is no longer being
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* listed
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*
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* Please do not ever call this on a non-local client.
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* If you do, you will get SIGSEGV.
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*/
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static void safelist_client_release(struct Client *client_p)
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{
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s_assert(MyClient(client_p));
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dlinkFindDestroy(client_p, &safelisting_clients);
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MyFree(client_p->localClient->safelist_data);
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client_p->localClient->safelist_data = NULL;
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sendto_one(client_p, form_str(RPL_LISTEND), me.name, client_p->name);
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}
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/*
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* safelist_channel_named()
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*
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* inputs - client pointer, channel name
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* outputs - none
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* side effects - a named channel is listed
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*/
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static void safelist_channel_named(struct Client *source_p, const char *name)
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{
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struct Channel *chptr;
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char *p;
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char *n = LOCAL_COPY(name);
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sendto_one(source_p, form_str(RPL_LISTSTART), me.name, source_p->name);
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if ((p = strchr(n, ',')))
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*p = '\0';
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if (*n == '\0')
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{
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sendto_one_numeric(source_p, ERR_NOSUCHNICK, form_str(ERR_NOSUCHNICK), name);
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sendto_one(source_p, form_str(RPL_LISTEND), me.name, source_p->name);
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return;
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}
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chptr = find_channel(n);
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if (chptr == NULL)
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{
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sendto_one_numeric(source_p, ERR_NOSUCHNICK, form_str(ERR_NOSUCHNICK), n);
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sendto_one(source_p, form_str(RPL_LISTEND), me.name, source_p->name);
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return;
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}
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if (ShowChannel(source_p, chptr))
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sendto_one(source_p, form_str(RPL_LIST), me.name, source_p->name, chptr->chname,
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dlink_list_length(&chptr->members),
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chptr->topic == NULL ? "" : chptr->topic);
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sendto_one(source_p, form_str(RPL_LISTEND), me.name, source_p->name);
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return;
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}
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/*
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* safelist_one_channel()
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*
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* inputs - client pointer and channel pointer
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* outputs - none
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* side effects - a channel is listed if it meets the
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* requirements
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*/
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static void safelist_one_channel(struct Client *source_p, struct Channel *chptr)
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{
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struct ListClient *safelist_data = source_p->localClient->safelist_data;
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if (SecretChannel(chptr) && !IsMember(source_p, chptr))
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return;
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if ((unsigned int)chptr->members.length < safelist_data->users_min
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|| (unsigned int)chptr->members.length > safelist_data->users_max)
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return;
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sendto_one(source_p, form_str(RPL_LIST), me.name, source_p->name, chptr->chname,
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chptr->members.length, chptr->topic == NULL ? "" : chptr->topic);
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}
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/*
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* safelist_iterate_client()
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*
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* inputs - client pointer
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* outputs - none
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* side effects - the client's sendq is filled up again
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*/
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static void safelist_iterate_client(struct Client *source_p)
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{
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dlink_node *ptr;
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int iter;
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for (iter = source_p->localClient->safelist_data->hash_indice; iter < CH_MAX; iter++)
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{
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if (safelist_sendq_exceeded(source_p->from) == YES)
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{
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source_p->localClient->safelist_data->hash_indice = iter;
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return;
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}
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DLINK_FOREACH(ptr, channelTable[iter].head)
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safelist_one_channel(source_p, (struct Channel *) ptr->data);
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}
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safelist_client_release(source_p);
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}
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static void safelist_iterate_clients(void *unused)
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{
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dlink_node *n, *n2;
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DLINK_FOREACH_SAFE(n, n2, safelisting_clients.head)
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safelist_iterate_client((struct Client *)n->data);
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}
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