src/event_neonspam_chanmsg.c

   1 /* event_neonspam_chanmsg.c - NeonServ v5.1
   2  * Copyright (C) 2011  Philipp Kreil (pk910)
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #define SPAMSERV_CHECK_IGNORE 0
  19 #define SPAMSERV_CHECK_WARN   1
  20 #define SPAMSERV_CHECK_PUNISH 2
  21
  22 #define SPAMSERV_MSG_SPAM       "Spamming"
  23 #define SPAMSERV_MSG_FLOOD      "Flooding the channel/network"
  24 #define SPAMSERV_MSG_ADV        "Advertising"
  25 #define SPAMSERV_MSG_JOINFLOOD  "Join flooding the channel"
  26 #define SPAMSERV_MSG_WARNING    "%s is against the network rules"
  27
  28 static int neonspam_spamscan(struct NeonSpamSettings *settings, struct ChanUser *chanuser, char *message);
  29 static int neonspam_floodscan(struct NeonSpamSettings *settings, struct ChanUser *chanuser);
  30
  31 static USERAUTH_CALLBACK(neonspam_event_chanmsg_nick_lookup);
  32 static void neonspam_event_chanmsg_punish(struct ClientSocket *client, struct ChanUser *chanuser, struct NeonSpamSettings *settings, int action, char *reason, char *reaction);
  33
  34 struct neonspam_event_chanmsg_cache {
  35     struct ClientSocket *client;
  36     struct ChanUser *chanuser;
  37     struct NeonSpamSettings *settings;
  38     int action;
  39     char *reason;
  40     char *reaction;
  41 };
  42
  43 static void neonspam_event_chanmsg(struct UserNode *user, struct ChanNode *chan, char *message) {
  44     struct ClientSocket *client = getChannelBot(chan, BOTID);
  45     if(!client) return; //we can't "see" this event
  46     loadNeonSpamSettings(chan);
  47     struct NeonSpamSettings *settings = chan->spam_settings;
  48     struct ChanUser *chanuser = getChanUser(user, chan);
  49     if(!settings || !chanuser) return;
  50
  51     //ignore messages from ops/voices if we ignore them
  52     if(!(settings->flags & SPAMSETTINGS_SCANOPS) && (chanuser->flags & CHANUSERFLAG_OPPED)) return;
  53     if(!(settings->flags & SPAMSETTINGS_SCANVOICE) && (chanuser->flags & CHANUSERFLAG_VOICED)) return;
  54     if(settings->exceptlevel == 0) return;
  55     //scan the message
  56     int result = 0;
  57     int action = SPAMSERV_CHECK_IGNORE;
  58     char reason[MAXLEN];
  59     char *reaction = NULL;
  60     if(action != SPAMSERV_CHECK_PUNISH && (settings->flags & SPAMSETTINGS_SPAMSCAN)) {
  61         result = neonspam_spamscan(settings, chanuser, message);
  62         switch(result) {
  63             case SPAMSERV_CHECK_IGNORE:
  64                 break;
  65             case SPAMSERV_CHECK_WARN:
  66                 if(action == SPAMSERV_CHECK_IGNORE) {
  67                     action = result;
  68                     sprintf(reason, SPAMSERV_MSG_WARNING, SPAMSERV_MSG_SPAM);
  69                 }
  70                 break;
  71             case SPAMSERV_CHECK_PUNISH:
  72                 if(action != SPAMSERV_CHECK_PUNISH) {
  73                     action = result;
  74                     sprintf(reason, SPAMSERV_MSG_WARNING, SPAMSERV_MSG_SPAM);
  75                     reaction = "channel_repeatreaction";
  76                 }
  77                 break;
  78         }
  79     }
  80     if(action != SPAMSERV_CHECK_PUNISH && (settings->flags & SPAMSETTINGS_FLOODSCAN)) {
  81         result = neonspam_floodscan(settings, chanuser);
  82         switch(result) {
  83             case SPAMSERV_CHECK_IGNORE:
  84                 break;
  85             case SPAMSERV_CHECK_WARN:
  86                 if(action == SPAMSERV_CHECK_IGNORE) {
  87                     action = result;
  88                     sprintf(reason, SPAMSERV_MSG_WARNING, SPAMSERV_MSG_SPAM);
  89                 }
  90                 break;
  91             case SPAMSERV_CHECK_PUNISH:
  92                 if(action != SPAMSERV_CHECK_PUNISH) {
  93                     action = result;
  94                     sprintf(reason, SPAMSERV_MSG_WARNING, SPAMSERV_MSG_SPAM);
  95                     reaction = "channel_floodreaction";
  96                 }
  97                 break;
  98         }
  99     }
 100     //some other checks?
 101
 102     if(action != SPAMSERV_CHECK_IGNORE) {
 103         //whois the user to check against exceptlevel
 104         if((user->flags & USERFLAG_ISAUTHED) || settings->exceptlevel == 501) {
 105             neonspam_event_chanmsg_punish(client, chanuser, settings, action, reason, reaction);
 106         } else {
 107             struct neonspam_event_chanmsg_cache *cache = malloc(sizeof(*cache));
 108             if (!cache) {
 109                 perror("malloc() failed");
 110                 return;
 111             }
 112             cache->client = client;
 113             cache->chanuser = chanuser;
 114             cache->settings = settings;
 115             cache->action = action;
 116             cache->reason = strdup(reason);
 117             cache->reaction = reaction;
 118             get_userauth(user, neonspam_event_chanmsg_nick_lookup, cache);
 119         }
 120
 121     }
 122 }
 123
 124 static USERAUTH_CALLBACK(neonspam_event_chanmsg_nick_lookup) {
 125     struct neonspam_event_chanmsg_cache *cache = data;
 126     neonspam_event_chanmsg_punish(cache->client, cache->chanuser, cache->settings, cache->action, cache->reason, cache->reaction);
 127     free(cache->reason);
 128     free(cache);
 129 }
 130
 131 static void neonspam_event_chanmsg_punish(struct ClientSocket *client, struct ChanUser *chanuser, struct NeonSpamSettings *settings, int action, char *reason, char *reaction) {
 132     int uaccess = 0;
 133     if(chanuser->user->flags & USERFLAG_ISAUTHED)
 134         uaccess = getChannelAccess(chanuser->user, chanuser->chan, 0);
 135     if(uaccess >= settings->exceptlevel) return;
 136     if(action == SPAMSERV_CHECK_WARN) {
 137         reply(client, chanuser->user, "%s", reason);
 138     } else if(action == SPAMSERV_CHECK_PUNISH) {
 139         MYSQL_RES *res;
 140         MYSQL_ROW row;
 141         loadChannelSettings(chanuser->chan);
 142         printf_mysql_query("SELECT `%s` FROM `channels` WHERE `channel_id` = '%d'", reaction, chanuser->chan->channel_id);
 143         res = mysql_use();
 144         row = mysql_fetch_row(res);
 145         int duration = 0;
 146         char banmaskBuf[NICKLEN+USERLEN+HOSTLEN+3];
 147         char *banmask = NULL;
 148         switch (atoi(row[0])) {
 149             case 2: //TIMEBAN: 3min
 150                 duration = 180;
 151             case 3: //TIMEBAN: 1h
 152                 if(!duration)
 153                     duration = 3600;
 154                 banmask = generate_banmask(chanuser->user, banmaskBuf);
 155                 printf_mysql_query("INSERT INTO `bans` (`ban_channel`, `ban_mask`, `ban_triggered`, `ban_timeout`, `ban_owner`, `ban_reason`) VALUES ('%d', '%s', UNIX_TIMESTAMP(), '%lu', '%d', '%s')", chanuser->chan->channel_id, escape_string(banmask), (unsigned long) (time(0) + duration), 0, escape_string(reason));
 156                 int banid = (int) mysql_insert_id(mysql_conn);
 157                 char nameBuf[MAXLEN];
 158                 char banidBuf[20];
 159                 sprintf(nameBuf, "ban_%d", banid);
 160                 sprintf(banidBuf, "%d", banid);
 161                 timeq_add_name(nameBuf, duration, channel_ban_timeout, strdup(banidBuf));
 162             case 1: //KICKBAN
 163                 if(!banmask)
 164                     banmask = generate_banmask(chanuser->user, banmaskBuf);
 165                 putsock(client, "MODE %s +b %s", chanuser->chan->name, banmask);
 166             case 0: //KICK
 167                 putsock(client, "KICK %s %s :%s", chanuser->chan->name, chanuser->user->nick, reason);
 168                 break;
 169         }
 170     }
 171 }
 172
 173 static int neonspam_spamscan(struct NeonSpamSettings *settings, struct ChanUser *chanuser, char *message) {
 174     //crc32 hash of the message
 175     unsigned long msghash = crc32(message);
 176     if(chanuser->spamnode) {
 177         if(chanuser->spamnode->lastmsg == msghash) {
 178             chanuser->spamnode->spamcount++;
 179             if(chanuser->spamnode->spamcount == settings->spam_amount)
 180                 return SPAMSERV_CHECK_WARN;
 181             else if(chanuser->spamnode->spamcount > settings->spam_amount)
 182                 return SPAMSERV_CHECK_PUNISH;
 183             else
 184                 return SPAMSERV_CHECK_IGNORE;
 185         }
 186     } else
 187         createSpamNode(chanuser);
 188     chanuser->spamnode->lastmsg = msghash;
 189     chanuser->spamnode->spamcount = 1;
 190     return SPAMSERV_CHECK_IGNORE;
 191 }
 192
 193 static int neonspam_update_penalty(struct NeonSpamSettings *settings, struct ChanUser *chanuser, int addmsg) {
 194     int last_update = time(0) - chanuser->spamnode->last_penalty_update;
 195     if(last_update) {
 196         if(last_update < MAX_FLOOD_TIME && chanuser->spamnode->floodpenalty) {
 197             chanuser->spamnode->floodpenalty -= last_update * (MAX_FLOOD_TIME / settings->flood_time);
 198             if(chanuser->spamnode->floodpenalty < 0)
 199                 chanuser->spamnode->floodpenalty = 0;
 200         } else
 201             chanuser->spamnode->floodpenalty = 0;
 202         chanuser->spamnode->last_penalty_update = time(0);
 203     }
 204     chanuser->spamnode->floodpenalty += MAX_FLOOD_TIME * addmsg;
 205     return chanuser->spamnode->floodpenalty / MAX_FLOOD_TIME + ((chanuser->spamnode->floodpenalty % MAX_FLOOD_TIME) ? 1 : 0);
 206 }
 207
 208 static int neonspam_floodscan(struct NeonSpamSettings *settings, struct ChanUser *chanuser) {
 209     if(!chanuser->spamnode)
 210         createSpamNode(chanuser);
 211     int messages_pending = neonspam_update_penalty(settings, chanuser, 1);
 212     if(messages_pending == settings->flood_amount)
 213         return SPAMSERV_CHECK_WARN;
 214     else if(messages_pending > settings->flood_amount)
 215         return SPAMSERV_CHECK_PUNISH;
 216     else
 217         return SPAMSERV_CHECK_IGNORE;
 218 }
 219
 220