mirror of
https://github.com/matrix-construct/construct
synced 2024-08-23 18:14:46 +02:00
499 lines
13 KiB
C
499 lines
13 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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#include "stdinc.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 "match.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_newconf.h"
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#include "s_serv.h"
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#include "supported.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 "inline/stringops.h"
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#include "s_assert.h"
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#include "logger.h"
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#include "rb_radixtree.h"
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static const char list_desc[] = "Provides the LIST command to clients to view non-hidden channels";
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static rb_dlink_list safelisting_clients = { NULL, NULL, 0 };
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static struct ev_entry *iterate_clients_ev = NULL;
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static int _modinit(void);
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static void _moddeinit(void);
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static void m_list(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void mo_list(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void list_one_channel(struct Client *source_p, struct Channel *chptr, int visible);
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static void safelist_one_channel(struct Client *source_p, struct Channel *chptr, struct ListClient *params);
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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_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, int operspy);
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struct Message list_msgtab = {
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"LIST", 0, 0, 0, 0,
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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_AV2(list, _modinit, _moddeinit, list_clist, NULL, list_hfnlist, NULL, NULL, list_desc);
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static int _modinit(void)
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{
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iterate_clients_ev = rb_event_add("safelist_iterate_clients", safelist_iterate_clients, NULL, 3);
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/* ELIST=[tokens]:
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*
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* M = mask search
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* N = !mask search
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* U = user count search (< >)
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* C = creation time search (C> C<)
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* T = topic search (T> T<)
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*/
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add_isupport("SAFELIST", isupport_string, "");
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add_isupport("ELIST", isupport_string, "CTU");
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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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rb_event_delete(iterate_clients_ev);
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delete_isupport("SAFELIST");
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delete_isupport("ELIST");
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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[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 void
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m_list(struct MsgBuf *msgbuf_p, 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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safelist_client_release(source_p);
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return;
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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) > rb_current_time()))
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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;
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}
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else
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last_used = rb_current_time();
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}
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mo_list(msgbuf_p, client_p, source_p, parc, parv);
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}
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/* mo_list()
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* parv[1] = channel
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*/
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static void
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mo_list(struct MsgBuf *msgbuf_p, 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;
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char *args = NULL;
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int i;
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int operspy = 0;
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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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safelist_client_release(source_p);
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return;
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}
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if (parc > 1)
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{
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args = LOCAL_COPY(parv[1]);
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}
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if (args && *args == '!' && IsOperSpy(source_p))
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{
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args++;
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report_operspy(source_p, "LIST", args);
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operspy = 1;
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}
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/* Single channel. */
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if (args && IsChannelName(args))
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{
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safelist_channel_named(source_p, args, operspy);
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return;
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}
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/* Multiple channels, possibly with parameters. */
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params = rb_malloc(sizeof(struct ListClient));
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params->users_min = ConfigChannel.displayed_usercount;
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params->users_max = INT_MAX;
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params->operspy = operspy;
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params->created_min = params->topic_min =
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params->created_max = params->topic_max = 0;
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if (args && !EmptyString(args))
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{
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/* Cancel out default minimum. */
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params->users_min = 0;
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for (i = 0; i < 7; 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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}
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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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else if (*args == 'C' || *args == 'c')
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{
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args++;
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if (*args == '>')
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{
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/* Creation time earlier than last x minutes. */
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args++;
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if (IsDigit(*args))
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{
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params->created_max = rb_current_time() - (60 * atoi(args));
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}
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}
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else if (*args == '<')
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{
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/* Creation time within last x minutes. */
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args++;
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if (IsDigit(*args))
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{
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params->created_min = rb_current_time() - (60 * atoi(args));
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}
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}
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}
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else if (*args == 'T' || *args == 't')
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{
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args++;
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if (*args == '>')
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{
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/* Topic change time earlier than last x minutes. */
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args++;
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if (IsDigit(*args))
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{
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params->topic_max = rb_current_time() - (60 * atoi(args));
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}
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}
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else if (*args == '<')
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{
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/* Topic change time within last x minutes. */
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args++;
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if (IsDigit(*args))
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{
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params->topic_min = rb_current_time() - (60 * atoi(args));
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}
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}
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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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safelist_client_instantiate(source_p, params);
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}
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/*
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* list_one_channel()
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*
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* inputs - client pointer, channel pointer, whether normally visible
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* outputs - none
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* side effects - a channel is listed
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*/
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static void list_one_channel(struct Client *source_p, struct Channel *chptr,
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int visible)
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{
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char topic[TOPICLEN + 1];
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if (chptr->topic != NULL)
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rb_strlcpy(topic, chptr->topic, sizeof topic);
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else
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topic[0] = '\0';
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strip_colour(topic);
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sendto_one(source_p, form_str(RPL_LIST), me.name, source_p->name,
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visible ? "" : "!",
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chptr->chname, rb_dlink_list_length(&chptr->members),
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topic);
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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 - true if a client has exceeded the reserved
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* sendq limit, false 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 bool safelist_sendq_exceeded(struct Client *client_p)
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{
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return rb_linebuf_len(&client_p->localClient->buf_sendq) > (get_sendq(client_p) / 2);
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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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* pointer to ListClient 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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s_assert(MyClient(client_p));
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s_assert(params != NULL);
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client_p->localClient->safelist_data = params;
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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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rb_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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static void safelist_client_release(struct Client *client_p)
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{
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if(!MyClient(client_p))
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return;
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s_assert(MyClient(client_p));
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rb_dlinkFindDestroy(client_p, &safelisting_clients);
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rb_free(client_p->localClient->safelist_data->chname);
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rb_free(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, operspy
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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, int operspy)
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{
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struct Channel *chptr;
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char *p;
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int visible;
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sendto_one(source_p, form_str(RPL_LISTSTART), me.name, source_p->name);
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if ((p = strchr(name, ',')))
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*p = '\0';
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if (*name == '\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(name);
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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), 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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visible = !SecretChannel(chptr) || IsMember(source_p, chptr);
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if (visible || operspy)
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list_one_channel(source_p, chptr, visible);
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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, struct ListClient *params)
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{
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int visible;
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visible = !SecretChannel(chptr) || IsMember(source_p, chptr);
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if (!visible && !params->operspy)
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return;
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if ((unsigned int)chptr->members.length < params->users_min
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|| (unsigned int)chptr->members.length > params->users_max)
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return;
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if (params->topic_min && chptr->topic_time < params->topic_min)
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return;
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/* If a topic TS is provided, don't show channels without a topic set. */
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if (params->topic_max && (chptr->topic_time > params->topic_max
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|| chptr->topic_time == 0))
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return;
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if (params->created_min && chptr->channelts < params->created_min)
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return;
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if (params->created_max && chptr->channelts > params->created_max)
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return;
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list_one_channel(source_p, chptr, visible);
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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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struct Channel *chptr;
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rb_radixtree_iteration_state iter;
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RB_RADIXTREE_FOREACH_FROM(chptr, &iter, channel_tree, source_p->localClient->safelist_data->chname)
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{
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if (safelist_sendq_exceeded(source_p->from))
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{
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rb_free(source_p->localClient->safelist_data->chname);
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source_p->localClient->safelist_data->chname = rb_strdup(chptr->chname);
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return;
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}
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safelist_one_channel(source_p, chptr, source_p->localClient->safelist_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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rb_dlink_node *n, *n2;
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RB_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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