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/* |
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* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd) |
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* |
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* Copyright (c) 1997-2022 ircd-hybrid development team |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 |
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* USA |
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*/ |
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|
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/*! \file m_message.c |
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* \brief Includes required functions for processing the PRIVMSG/NOTICE command. |
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* \version $Id$ |
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*/ |
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|
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#include "stdinc.h" |
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#include "list.h" |
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#include "client.h" |
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#include "ircd.h" |
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#include "numeric.h" |
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#include "conf.h" |
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#include "server.h" |
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#include "send.h" |
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#include "parse.h" |
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#include "modules.h" |
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#include "channel.h" |
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#include "channel_mode.h" |
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#include "irc_string.h" |
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#include "hash.h" |
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#include "packet.h" |
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#include "misc.h" |
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|
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|
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enum |
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{ |
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ENTITY_NONE, |
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ENTITY_CHANNEL, |
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ENTITY_CLIENT |
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}; |
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|
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static const char *const command[] = |
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{ |
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[false] = "PRIVMSG", |
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[true] = "NOTICE" |
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}; |
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|
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static struct |
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{ |
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void *ptr; |
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unsigned int type; |
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unsigned int rank; |
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} targets[IRCD_BUFSIZE]; |
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|
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static unsigned int ntargets; |
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|
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|
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/* duplicate_ptr() |
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* |
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* inputs - pointer to check |
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* - pointer to table of entities |
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* - number of valid entities so far |
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* output - YES if duplicate pointer in table, NO if not. |
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* note, this does the canonize using pointers |
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* side effects - NONE |
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*/ |
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static bool |
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duplicate_ptr(const void *const ptr) |
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{ |
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for (unsigned int i = 0; i < ntargets; ++i) |
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if (targets[i].ptr == ptr) |
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return true; |
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|
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return false; |
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} |
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|
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/* flood_attack_client() |
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* |
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* inputs - flag 0 if PRIVMSG 1 if NOTICE. RFC |
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* say NOTICE must not auto reply |
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* - pointer to source Client |
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* - pointer to target Client |
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* output - 1 if target is under flood attack |
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* side effects - check for flood attack on target target_p |
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*/ |
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static bool |
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flood_attack_client(bool notice, struct Client *source_p, struct Client *target_p) |
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{ |
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assert(MyClient(target_p)); |
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assert(IsClient(source_p)); |
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|
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if (!(GlobalSetOptions.floodcount && GlobalSetOptions.floodtime)) |
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return false; |
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|
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if (HasUMode(source_p, UMODE_OPER)) |
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return false; |
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|
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if (HasFlag(source_p, FLAGS_SERVICE | FLAGS_CANFLOOD)) |
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return false; |
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|
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if (target_p->connection->first_received_message_time + GlobalSetOptions.floodtime < event_base->time.sec_monotonic) |
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{ |
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if (target_p->connection->received_number_of_privmsgs) |
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target_p->connection->received_number_of_privmsgs = 0; |
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else |
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DelFlag(target_p, FLAGS_FLOOD_NOTICED); |
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|
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target_p->connection->first_received_message_time = event_base->time.sec_monotonic; |
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} |
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|
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if (target_p->connection->received_number_of_privmsgs >= GlobalSetOptions.floodcount) |
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{ |
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if (!HasFlag(target_p, FLAGS_FLOOD_NOTICED)) |
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{ |
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sendto_realops_flags(UMODE_FLOOD, L_ALL, SEND_NOTICE, "Possible Flooder %s on %s target: %s", |
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client_get_name(source_p, HIDE_IP), |
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source_p->servptr->name, target_p->name); |
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AddFlag(target_p, FLAGS_FLOOD_NOTICED); |
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} |
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|
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if (notice == false) |
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sendto_one_notice(source_p, &me, ":*** Message to %s throttled due to flooding", |
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target_p->name); |
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return true; |
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} |
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|
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++target_p->connection->received_number_of_privmsgs; |
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return false; |
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} |
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|
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/* flood_attack_channel() |
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* |
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* inputs - flag 0 if PRIVMSG 1 if NOTICE. RFC |
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* says NOTICE must not auto reply |
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* - pointer to source Client |
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* - pointer to target channel |
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* output - 1 if target is under flood attack |
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* side effects - check for flood attack on target channel |
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*/ |
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static bool |
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flood_attack_channel(bool notice, struct Client *source_p, struct Channel *channel) |
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{ |
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if (!(GlobalSetOptions.floodcount && GlobalSetOptions.floodtime)) |
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return false; |
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|
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if (HasUMode(source_p, UMODE_OPER)) |
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return false; |
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|
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if (HasFlag(source_p, FLAGS_SERVICE | FLAGS_CANFLOOD)) |
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return false; |
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|
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if (channel->first_received_message_time + GlobalSetOptions.floodtime < event_base->time.sec_monotonic) |
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{ |
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if (channel->received_number_of_privmsgs) |
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channel->received_number_of_privmsgs = 0; |
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else |
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ClearFloodNoticed(channel); |
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|
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channel->first_received_message_time = event_base->time.sec_monotonic; |
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} |
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|
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if (channel->received_number_of_privmsgs >= GlobalSetOptions.floodcount) |
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{ |
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if (!IsSetFloodNoticed(channel)) |
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{ |
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sendto_realops_flags(UMODE_FLOOD, L_ALL, SEND_NOTICE, "Possible Flooder %s on %s target: %s", |
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client_get_name(source_p, HIDE_IP), |
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source_p->servptr->name, channel->name); |
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SetFloodNoticed(channel); |
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} |
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|
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if (MyClient(source_p)) |
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{ |
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if (notice == false) |
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sendto_one_notice(source_p, &me, ":*** Message to %s throttled due to flooding", |
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channel->name); |
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return true; |
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} |
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} |
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|
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++channel->received_number_of_privmsgs; |
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return false; |
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} |
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|
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/* msg_channel_flags() |
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* |
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* inputs - flag 0 if PRIVMSG 1 if NOTICE. RFC |
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* say NOTICE must not auto reply |
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* - pointer to source_p |
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* - pointer to channel |
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* - flags |
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* - pointer to text to send |
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* output - NONE |
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* side effects - message given channel either chanop or voice |
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*/ |
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static void |
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msg_channel(bool notice, struct Client *source_p, struct Channel *channel, |
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unsigned int rank, const char *text) |
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{ |
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const char *error = NULL; |
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|
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/* Chanops and voiced can flood their own channel with impunity */ |
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int ret = can_send(channel, source_p, NULL, text, notice, &error); |
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if (ret != CAN_SEND_NO) |
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{ |
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if (ret == CAN_SEND_OPV || flood_attack_channel(notice, source_p, channel) == false) |
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{ |
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const char *const prefix = channel_rank_to_prefix(rank); |
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sendto_channel_butone(source_p, source_p, channel, rank, "%s %s%s :%s", |
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command[notice], prefix, channel->name, text); |
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} |
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} |
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else if (notice == false) |
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sendto_one_numeric(source_p, &me, ERR_CANNOTSENDTOCHAN, channel->name, error); |
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} |
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|
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/* msg_client() |
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* |
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* inputs - flag 0 if PRIVMSG 1 if NOTICE. RFC |
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* say NOTICE must not auto reply |
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* - pointer to source_p source (struct Client *) |
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* - pointer to target_p target (struct Client *) |
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* - pointer to text |
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* output - NONE |
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* side effects - message given channel either chanop or voice |
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*/ |
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static void |
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msg_client(bool notice, struct Client *source_p, struct Client *target_p, |
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const char *text) |
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{ |
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if (MyClient(source_p)) |
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{ |
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if (target_p->away[0] && notice == false) |
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sendto_one_numeric(source_p, &me, RPL_AWAY, target_p->name, target_p->away); |
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|
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if (HasUMode(target_p, UMODE_REGONLY) && target_p != source_p) |
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{ |
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if (!HasUMode(source_p, UMODE_REGISTERED | UMODE_OPER)) |
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{ |
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if (notice == false) |
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sendto_one_numeric(source_p, &me, ERR_NONONREG, target_p->name); |
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return; |
253 |
} |
254 |
} |
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} |
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|
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if (MyClient(target_p) && IsClient(source_p)) |
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{ |
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if (HasUMode(target_p, UMODE_CALLERID | UMODE_SOFTCALLERID) && |
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accept_message(source_p, target_p) == false) |
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{ |
262 |
bool callerid = HasUMode(target_p, UMODE_CALLERID) != 0; |
263 |
|
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/* check for accept, flag recipient incoming message */ |
265 |
if (notice == false) |
266 |
sendto_one_numeric(source_p, &me, RPL_TARGUMODEG, |
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target_p->name, |
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callerid ? "+g" : "+G", |
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callerid ? "server side ignore" : |
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"server side ignore with the exception of common channels"); |
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|
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if ((target_p->connection->last_caller_id_time + |
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ConfigGeneral.caller_id_wait) < event_base->time.sec_monotonic) |
274 |
{ |
275 |
if (notice == false) |
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sendto_one_numeric(source_p, &me, RPL_TARGNOTIFY, target_p->name); |
277 |
|
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sendto_one_numeric(target_p, &me, RPL_UMODEGMSG, |
279 |
source_p->name, source_p->username, source_p->host, |
280 |
callerid ? "+g" : "+G"); |
281 |
target_p->connection->last_caller_id_time = event_base->time.sec_monotonic; |
282 |
} |
283 |
|
284 |
/* Only so opers can watch for floods */ |
285 |
flood_attack_client(notice, source_p, target_p); |
286 |
return; |
287 |
} |
288 |
|
289 |
if (flood_attack_client(notice, source_p, target_p) == true) |
290 |
return; |
291 |
} |
292 |
|
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sendto_anywhere(target_p, source_p, command[notice], ":%s", text); |
294 |
} |
295 |
|
296 |
/* handle_special() |
297 |
* |
298 |
* inputs - client pointer |
299 |
* - nick stuff to grok for opers |
300 |
* - text to send if grok |
301 |
* output - none |
302 |
* side effects - old style nick@server is handled here for non opers |
303 |
* all the traditional oper type messages are also parsed here. |
304 |
* i.e. "/msg #some.host." |
305 |
* However, syntax has been changed. |
306 |
* previous syntax "/msg #some.host.mask" |
307 |
* now becomes "/msg $#some.host.mask" |
308 |
* previous syntax of: "/msg $some.server.mask" remains |
309 |
* This disambiguates the syntax. |
310 |
*/ |
311 |
static void |
312 |
handle_special(bool notice, struct Client *source_p, |
313 |
const char *nick, const char *text) |
314 |
{ |
315 |
/* |
316 |
* nick@server addressed? |
317 |
*/ |
318 |
const char *server = strchr(nick, '@'); |
319 |
if (server) |
320 |
{ |
321 |
struct Client *target_p = hash_find_server(server + 1); |
322 |
if (target_p == NULL) |
323 |
{ |
324 |
sendto_one_numeric(source_p, &me, ERR_NOSUCHSERVER, server + 1); |
325 |
return; |
326 |
} |
327 |
|
328 |
if (!IsMe(target_p)) |
329 |
{ |
330 |
sendto_one(target_p, ":%s %s %s :%s", source_p->id, command[notice], nick, text); |
331 |
return; |
332 |
} |
333 |
|
334 |
sendto_one_numeric(source_p, &me, ERR_NOSUCHNICK, nick); |
335 |
return; |
336 |
} |
337 |
|
338 |
if (!HasUMode(source_p, UMODE_OPER)) |
339 |
{ |
340 |
sendto_one_numeric(source_p, &me, ERR_NOPRIVILEGES); |
341 |
return; |
342 |
} |
343 |
|
344 |
/* |
345 |
* The following two cases allow masks in NOTICEs |
346 |
* (for OPERs only) |
347 |
* |
348 |
* Armin, 8Jun90 (gruner@informatik.tu-muenchen.de) |
349 |
*/ |
350 |
if (*nick == '$') |
351 |
{ |
352 |
if (*(nick + 1) == '$' || *(nick + 1) == '#') |
353 |
++nick; |
354 |
else if (MyClient(source_p)) |
355 |
{ |
356 |
sendto_one_notice(source_p, &me, ":The command %s %s is no longer supported, please use $%s", |
357 |
command[notice], nick, nick); |
358 |
return; |
359 |
} |
360 |
|
361 |
const char *s = strrchr(nick, '.'); |
362 |
if (s == NULL) |
363 |
{ |
364 |
sendto_one_numeric(source_p, &me, ERR_NOTOPLEVEL, nick); |
365 |
return; |
366 |
} |
367 |
|
368 |
while (*++s) |
369 |
if (*s == '.' || *s == '*' || *s == '?') |
370 |
break; |
371 |
|
372 |
if (*s == '*' || *s == '?') |
373 |
{ |
374 |
sendto_one_numeric(source_p, &me, ERR_WILDTOPLEVEL, nick); |
375 |
return; |
376 |
} |
377 |
|
378 |
sendto_match_butone(IsServer(source_p->from) ? source_p->from : NULL, source_p, nick + 1, |
379 |
(*nick == '#'), "%s $%s :%s", command[notice], nick, text); |
380 |
} |
381 |
} |
382 |
|
383 |
/* build_target_list() |
384 |
* |
385 |
* inputs - pointer to given source (oper/client etc.) |
386 |
* - pointer to list of nicks/channels |
387 |
* - pointer to table to place results |
388 |
* - pointer to text (only used if source_p is an oper) |
389 |
* output - number of valid entities |
390 |
* side effects - target_table is modified to contain a list of |
391 |
* pointers to channels or clients |
392 |
* if source client is an oper |
393 |
* all the classic old bizzare oper privmsg tricks |
394 |
* are parsed and sent as is, if prefixed with $ |
395 |
* to disambiguate. |
396 |
* |
397 |
*/ |
398 |
static void |
399 |
build_target_list(bool notice, struct Client *source_p, char *list, const char *text) |
400 |
{ |
401 |
char *p = NULL; |
402 |
|
403 |
ntargets = 0; |
404 |
|
405 |
for (const char *name = strtok_r(list, ",", &p); name; |
406 |
name = strtok_r(NULL, ",", &p)) |
407 |
{ |
408 |
void *target; |
409 |
|
410 |
/* |
411 |
* Channels are privmsg'd a lot more than other clients, moved up |
412 |
* here plain old channel msg? |
413 |
*/ |
414 |
if (IsChanPrefix(*name)) |
415 |
{ |
416 |
if ((target = hash_find_channel(name))) |
417 |
{ |
418 |
if (duplicate_ptr(target) == false) |
419 |
{ |
420 |
if (ntargets >= ConfigGeneral.max_targets) |
421 |
{ |
422 |
sendto_one_numeric(source_p, &me, ERR_TOOMANYTARGETS, |
423 |
name, ConfigGeneral.max_targets); |
424 |
return; |
425 |
} |
426 |
|
427 |
targets[ntargets].ptr = target; |
428 |
targets[ntargets].type = ENTITY_CHANNEL; |
429 |
targets[ntargets++].rank = 0; |
430 |
} |
431 |
} |
432 |
else if (notice == false) |
433 |
sendto_one_numeric(source_p, &me, ERR_NOSUCHNICK, name); |
434 |
|
435 |
continue; |
436 |
} |
437 |
|
438 |
/* Look for a PRIVMSG/NOTICE to another client */ |
439 |
if ((target = find_person(source_p, name))) |
440 |
{ |
441 |
if (duplicate_ptr(target) == false) |
442 |
{ |
443 |
if (ntargets >= ConfigGeneral.max_targets) |
444 |
{ |
445 |
sendto_one_numeric(source_p, &me, ERR_TOOMANYTARGETS, |
446 |
name, ConfigGeneral.max_targets); |
447 |
return; |
448 |
} |
449 |
|
450 |
targets[ntargets].ptr = target; |
451 |
targets[ntargets].type = ENTITY_CLIENT; |
452 |
targets[ntargets++].rank = 0; |
453 |
} |
454 |
|
455 |
continue; |
456 |
} |
457 |
|
458 |
/* @#channel or +#channel message ? */ |
459 |
unsigned int rank = CHACCESS_REMOTE; |
460 |
const char *with_prefix = name; |
461 |
|
462 |
/* Allow %+@ if someone wants to do that */ |
463 |
unsigned int ret; |
464 |
while ((ret = channel_prefix_to_rank(*name)) != CHACCESS_PEON) |
465 |
{ |
466 |
rank = IRCD_MIN(rank, ret); |
467 |
++name; |
468 |
} |
469 |
|
470 |
if (rank != CHACCESS_REMOTE) |
471 |
{ |
472 |
if (EmptyString(name)) /* If it's a '\0' dump it, there is no recipient */ |
473 |
{ |
474 |
sendto_one_numeric(source_p, &me, ERR_NORECIPIENT, command[notice]); |
475 |
continue; |
476 |
} |
477 |
|
478 |
/* |
479 |
* At this point, name should be a channel name i.e. #foo. If the channel |
480 |
* is found, fine, if not report an error. |
481 |
*/ |
482 |
if ((target = hash_find_channel(name))) |
483 |
{ |
484 |
if (IsClient(source_p) && !HasFlag(source_p, FLAGS_SERVICE)) |
485 |
{ |
486 |
if (member_highest_rank(member_find_link(source_p, target)) < CHACCESS_VOICE) |
487 |
{ |
488 |
sendto_one_numeric(source_p, &me, ERR_CHANOPRIVSNEEDED, with_prefix); |
489 |
continue; |
490 |
} |
491 |
} |
492 |
|
493 |
if (duplicate_ptr(target) == false) |
494 |
{ |
495 |
if (ntargets >= ConfigGeneral.max_targets) |
496 |
{ |
497 |
sendto_one_numeric(source_p, &me, ERR_TOOMANYTARGETS, |
498 |
name, ConfigGeneral.max_targets); |
499 |
return; |
500 |
} |
501 |
|
502 |
targets[ntargets].ptr = target; |
503 |
targets[ntargets].type = ENTITY_CHANNEL; |
504 |
targets[ntargets++].rank = rank; |
505 |
} |
506 |
} |
507 |
else if (notice == false) |
508 |
sendto_one_numeric(source_p, &me, ERR_NOSUCHNICK, name); |
509 |
|
510 |
continue; |
511 |
} |
512 |
|
513 |
if (*name == '$' || strchr(name, '@')) |
514 |
handle_special(notice, source_p, name, text); |
515 |
else if (notice == false) |
516 |
{ |
517 |
if (!IsDigit(*name) || MyClient(source_p)) |
518 |
sendto_one_numeric(source_p, &me, ERR_NOSUCHNICK, name); |
519 |
} |
520 |
} |
521 |
} |
522 |
|
523 |
/* |
524 |
* inputs - flag privmsg or notice |
525 |
* - pointer to source_p |
526 |
* - pointer to channel |
527 |
*/ |
528 |
static void |
529 |
m_message(bool notice, struct Client *source_p, int parc, char *parv[]) |
530 |
{ |
531 |
if (EmptyString(parv[1])) |
532 |
{ |
533 |
if (notice == false) |
534 |
sendto_one_numeric(source_p, &me, ERR_NORECIPIENT, command[notice]); |
535 |
return; |
536 |
} |
537 |
|
538 |
if (EmptyString(parv[2])) |
539 |
{ |
540 |
if (notice == false) |
541 |
sendto_one_numeric(source_p, &me, ERR_NOTEXTTOSEND); |
542 |
return; |
543 |
} |
544 |
|
545 |
build_target_list(notice, source_p, parv[1], parv[2]); |
546 |
|
547 |
for (unsigned int i = 0; i < ntargets; ++i) |
548 |
{ |
549 |
switch (targets[i].type) |
550 |
{ |
551 |
case ENTITY_CLIENT: |
552 |
msg_client(notice, source_p, targets[i].ptr, parv[2]); |
553 |
break; |
554 |
|
555 |
case ENTITY_CHANNEL: |
556 |
msg_channel(notice, source_p, targets[i].ptr, targets[i].rank, parv[2]); |
557 |
break; |
558 |
} |
559 |
} |
560 |
} |
561 |
|
562 |
static void |
563 |
m_privmsg(struct Client *source_p, int parc, char *parv[]) |
564 |
{ |
565 |
/* |
566 |
* Servers have no reason to send privmsgs, yet sometimes there is cause |
567 |
* for a notice.. (for example remote kline replies) --fl_ |
568 |
*/ |
569 |
if (!IsClient(source_p)) |
570 |
return; |
571 |
|
572 |
if (MyConnect(source_p)) |
573 |
source_p->connection->last_privmsg = event_base->time.sec_monotonic; |
574 |
|
575 |
m_message(false, source_p, parc, parv); |
576 |
} |
577 |
|
578 |
static void |
579 |
m_notice(struct Client *source_p, int parc, char *parv[]) |
580 |
{ |
581 |
m_message(true, source_p, parc, parv); |
582 |
} |
583 |
|
584 |
static struct Message privmsg_msgtab = |
585 |
{ |
586 |
.cmd = "PRIVMSG", |
587 |
.handlers[UNREGISTERED_HANDLER] = { .handler = m_unregistered }, |
588 |
.handlers[CLIENT_HANDLER] = { .handler = m_privmsg, .end_grace_period = true }, |
589 |
.handlers[SERVER_HANDLER] = { .handler = m_privmsg }, |
590 |
.handlers[ENCAP_HANDLER] = { .handler = m_ignore }, |
591 |
.handlers[OPER_HANDLER] = { .handler = m_privmsg, .end_grace_period = true } |
592 |
}; |
593 |
|
594 |
static struct Message notice_msgtab = |
595 |
{ |
596 |
.cmd = "NOTICE", |
597 |
.handlers[UNREGISTERED_HANDLER] = { .handler = m_unregistered }, |
598 |
.handlers[CLIENT_HANDLER] = { .handler = m_notice }, |
599 |
.handlers[SERVER_HANDLER] = { .handler = m_notice }, |
600 |
.handlers[ENCAP_HANDLER] = { .handler = m_ignore }, |
601 |
.handlers[OPER_HANDLER] = { .handler = m_notice } |
602 |
}; |
603 |
|
604 |
static void |
605 |
module_init(void) |
606 |
{ |
607 |
mod_add_cmd(&privmsg_msgtab); |
608 |
mod_add_cmd(¬ice_msgtab); |
609 |
} |
610 |
|
611 |
static void |
612 |
module_exit(void) |
613 |
{ |
614 |
mod_del_cmd(&privmsg_msgtab); |
615 |
mod_del_cmd(¬ice_msgtab); |
616 |
} |
617 |
|
618 |
struct module module_entry = |
619 |
{ |
620 |
.version = "$Revision$", |
621 |
.modinit = module_init, |
622 |
.modexit = module_exit, |
623 |
.is_core = true |
624 |
}; |