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 static int neonspam_spamscan(struct NeonSpamSettings *settings, struct ChanUser *chanuser, char *message);
  19 static int neonspam_floodscan(struct NeonSpamSettings *settings, struct ChanUser *chanuser);
  20
  21 static USERAUTH_CALLBACK(neonspam_event_chanmsg_nick_lookup);
  22 static void neonspam_event_chanmsg_punish(struct ClientSocket *client, struct ChanUser *chanuser, struct NeonSpamSettings *settings, int action, char *reason, char *reaction);
  23
  24 struct neonspam_event_chanmsg_cache {
  25     struct ClientSocket *client;
  26     struct ChanUser *chanuser;
  27     struct NeonSpamSettings *settings;
  28     int action;
  29     char *reason;
  30     char *reaction;
  31 };
  32
  33 static void neonspam_event_chanmsg(struct UserNode *user, struct ChanNode *chan, char *message) {
  34     struct ClientSocket *client = getChannelBot(chan, BOTID);
  35     if(!client) return; //we can't "see" this event
  36     loadNeonSpamSettings(chan);
  37     struct NeonSpamSettings *settings = chan->spam_settings;
  38     struct ChanUser *chanuser = getChanUser(user, chan);
  39     if(!settings || !chanuser) return;
  40
  41     //ignore messages from ops/voices if we ignore them
  42     if(!(settings->flags & SPAMSETTINGS_SCANOPS) && (chanuser->flags & CHANUSERFLAG_OPPED)) return;
  43     if(!(settings->flags & SPAMSETTINGS_SCANVOICE) && (chanuser->flags & CHANUSERFLAG_VOICED)) return;
  44     if(settings->exceptlevel == 0) return;
  45     //scan the message
  46     int result = 0;
  47     int action = SPAMSERV_CHECK_IGNORE;
  48     char reason[MAXLEN];
  49     char *reaction = NULL;
  50     if(action != SPAMSERV_CHECK_PUNISH && (settings->flags & SPAMSETTINGS_SPAMSCAN)) {
  51         result = neonspam_spamscan(settings, chanuser, message);
  52         switch(result) {
  53             case SPAMSERV_CHECK_IGNORE:
  54                 break;
  55             case SPAMSERV_CHECK_WARN:
  56                 if(action == SPAMSERV_CHECK_IGNORE) {
  57                     action = result;
  58                     sprintf(reason, SPAMSERV_MSG_WARNING, SPAMSERV_MSG_SPAM);
  59                 }
  60                 break;
  61             case SPAMSERV_CHECK_PUNISH:
  62                 if(action != SPAMSERV_CHECK_PUNISH) {
  63                     action = result;
  64                     sprintf(reason, SPAMSERV_MSG_WARNING, SPAMSERV_MSG_SPAM);
  65                     reaction = "channel_repeatreaction";
  66                 }
  67                 break;
  68         }
  69     }
  70     if(action != SPAMSERV_CHECK_PUNISH && (settings->flags & SPAMSETTINGS_FLOODSCAN)) {
  71         result = neonspam_floodscan(settings, chanuser);
  72         switch(result) {
  73             case SPAMSERV_CHECK_IGNORE:
  74                 break;
  75             case SPAMSERV_CHECK_WARN:
  76                 if(action == SPAMSERV_CHECK_IGNORE) {
  77                     action = result;
  78                     sprintf(reason, SPAMSERV_MSG_WARNING, SPAMSERV_MSG_FLOOD);
  79                 }
  80                 break;
  81             case SPAMSERV_CHECK_PUNISH:
  82                 if(action != SPAMSERV_CHECK_PUNISH) {
  83                     action = result;
  84                     sprintf(reason, SPAMSERV_MSG_WARNING, SPAMSERV_MSG_FLOOD);
  85                     reaction = "channel_floodreaction";
  86                 }
  87                 break;
  88         }
  89     }
  90     //some other checks?
  91
  92     if(action != SPAMSERV_CHECK_IGNORE) {
  93         //whois the user to check against exceptlevel
  94         if((user->flags & USERFLAG_ISAUTHED) || settings->exceptlevel == 501) {
  95             neonspam_event_chanmsg_punish(client, chanuser, settings, action, reason, reaction);
  96         } else {
  97             struct neonspam_event_chanmsg_cache *cache = malloc(sizeof(*cache));
  98             if (!cache) {
  99                 perror("malloc() failed");
 100                 return;
 101             }
 102             cache->client = client;
 103             cache->chanuser = chanuser;
 104             cache->settings = settings;
 105             cache->action = action;
 106             cache->reason = strdup(reason);
 107             cache->reaction = reaction;
 108             get_userauth(user, neonspam_event_chanmsg_nick_lookup, cache);
 109         }
 110
 111     }
 112 }
 113
 114 static USERAUTH_CALLBACK(neonspam_event_chanmsg_nick_lookup) {
 115     struct neonspam_event_chanmsg_cache *cache = data;
 116     neonspam_event_chanmsg_punish(cache->client, cache->chanuser, cache->settings, cache->action, cache->reason, cache->reaction);
 117     free(cache->reason);
 118     free(cache);
 119 }
 120
 121 static void neonspam_event_chanmsg_punish(struct ClientSocket *client, struct ChanUser *chanuser, struct NeonSpamSettings *settings, int action, char *reason, char *reaction) {
 122     int uaccess = 0;
 123     if(chanuser->user->flags & USERFLAG_ISAUTHED)
 124         uaccess = getChannelAccess(chanuser->user, chanuser->chan, 0);
 125     if(uaccess >= settings->exceptlevel) return;
 126     if(action == SPAMSERV_CHECK_WARN) {
 127         reply(client, chanuser->user, "%s", reason);
 128     } else if(action == SPAMSERV_CHECK_PUNISH) {
 129         MYSQL_RES *res;
 130         MYSQL_ROW row;
 131         loadChannelSettings(chanuser->chan);
 132         printf_mysql_query("SELECT `%s` FROM `channels` WHERE `channel_id` = '%d'", reaction, chanuser->chan->channel_id);
 133         res = mysql_use();
 134         row = mysql_fetch_row(res);
 135         if(!row[0]) {
 136             printf_mysql_query("SELECT `%s` FROM `channels` WHERE `channel_name` = 'defaults'", reaction);
 137             res = mysql_use();
 138             row = mysql_fetch_row(res);
 139         }
 140         int duration = 0;
 141         char banmaskBuf[NICKLEN+USERLEN+HOSTLEN+3];
 142         char *banmask = NULL;
 143         switch (atoi(row[0])) {
 144             case 2: //TIMEBAN: 3min
 145                 duration = 180;
 146             case 3: //TIMEBAN: 1h
 147                 if(!duration)
 148                     duration = 3600;
 149                 banmask = generate_banmask(chanuser->user, banmaskBuf);
 150                 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));
 151                 int banid = (int) mysql_insert_id(mysql_conn);
 152                 char nameBuf[MAXLEN];
 153                 char banidBuf[20];
 154                 sprintf(nameBuf, "ban_%d", banid);
 155                 sprintf(banidBuf, "%d", banid);
 156                 timeq_add_name(nameBuf, duration, channel_ban_timeout, strdup(banidBuf));
 157             case 1: //KICKBAN
 158                 if(!banmask)
 159                     banmask = generate_banmask(chanuser->user, banmaskBuf);
 160                 putsock(client, "MODE %s +b %s", chanuser->chan->name, banmask);
 161             case 0: //KICK
 162                 putsock(client, "KICK %s %s :%s", chanuser->chan->name, chanuser->user->nick, reason);
 163                 break;
 164         }
 165     }
 166 }
 167
 168 static int neonspam_spamscan(struct NeonSpamSettings *settings, struct ChanUser *chanuser, char *message) {
 169     //crc32 hash of the message
 170     unsigned long msghash = crc32(message);
 171     if(chanuser->spamnode) {
 172         if(chanuser->spamnode->lastmsg == msghash) {
 173             chanuser->spamnode->spamcount++;
 174             if(chanuser->spamnode->spamcount == settings->spam_amount)
 175                 return SPAMSERV_CHECK_WARN;
 176             else if(chanuser->spamnode->spamcount > settings->spam_amount)
 177                 return SPAMSERV_CHECK_PUNISH;
 178             else
 179                 return SPAMSERV_CHECK_IGNORE;
 180         }
 181     } else
 182         createSpamNode(chanuser);
 183     chanuser->spamnode->lastmsg = msghash;
 184     chanuser->spamnode->spamcount = 1;
 185     return SPAMSERV_CHECK_IGNORE;
 186 }
 187
 188 static int neonspam_update_penalty(struct NeonSpamSettings *settings, struct ChanUser *chanuser, int addmsg) {
 189     int last_update = time(0) - chanuser->spamnode->last_penalty_update;
 190     if(last_update) {
 191         if(last_update < MAX_FLOOD_TIME && chanuser->spamnode->floodpenalty) {
 192             chanuser->spamnode->floodpenalty -= last_update * (MAX_FLOOD_TIME / settings->flood_time);
 193             if(chanuser->spamnode->floodpenalty < 0)
 194                 chanuser->spamnode->floodpenalty = 0;
 195         } else
 196             chanuser->spamnode->floodpenalty = 0;
 197         chanuser->spamnode->last_penalty_update = time(0);
 198     }
 199     chanuser->spamnode->floodpenalty += MAX_FLOOD_TIME * addmsg;
 200     return chanuser->spamnode->floodpenalty / MAX_FLOOD_TIME + ((chanuser->spamnode->floodpenalty % MAX_FLOOD_TIME) ? 1 : 0);
 201 }
 202
 203 static int neonspam_floodscan(struct NeonSpamSettings *settings, struct ChanUser *chanuser) {
 204     if(!chanuser->spamnode)
 205         createSpamNode(chanuser);
 206     int messages_pending = neonspam_update_penalty(settings, chanuser, 1);
 207     if(messages_pending == settings->flood_amount)
 208         return SPAMSERV_CHECK_WARN;
 209     else if(messages_pending > settings->flood_amount)
 210         return SPAMSERV_CHECK_PUNISH;
 211     else
 212         return SPAMSERV_CHECK_IGNORE;
 213 }
 214
 215