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/*
* flood.c: handle channel flooding.
*
* This attempts to give you some protection from flooding. Basically, it keeps
* track of how far apart (timewise) messages come in from different people.
* If a single nickname sends more than 3 messages in a row in under a
* second, this is considered flooding. It then activates the ON FLOOD with
* the nickname and type (appropriate for use with IGNORE).
*
* Thanks to Tomi Ollila <f36664r@puukko.hut.fi> for this one.
*/
#include "irc.h"
IRCII_RCSID("@(#)$eterna: flood.c,v 1.19 2002/09/03 02:39:30 mrg Exp $");
#include "hook.h"
#include "ircaux.h"
#include "ignore.h"
#include "flood.h"
#include "vars.h"
#include "output.h"
static char *ignore_types[NUMBER_OF_FLOODS] =
{
"MSG",
"PUBLIC",
"NOTICE",
"WALL",
"WALLOP"
};
typedef struct flood_stru
{
u_char *nick;
int type;
u_char flood;
long cnt;
time_t start;
} Flooding;
static Flooding *flood = (Flooding *) 0;
/*
* check_flooding: This checks for message flooding of the type specified for
* the given nickname. This is described above. This will return 0 if no
* flooding took place, or flooding is not being monitored from a certain
* person. It will return 1 if flooding is being check for someone and an ON
* FLOOD is activated.
*
* NOTE: flood's are never freed.
*/
int
check_flooding(nick, to, type, line)
u_char *nick;
u_char *to;
int type;
u_char *line;
{
static int users = 0,
pos = 0;
int i;
time_t flood_time,
diff;
Flooding *tmp;
if (users != get_int_var(FLOOD_USERS_VAR))
{
if ((users = get_int_var(FLOOD_USERS_VAR)) == 0)
return(1);
if (flood)
flood = (Flooding *) new_realloc(UP(flood), sizeof(Flooding) * users);
else
flood = (Flooding *) new_malloc(sizeof(Flooding) *
users);
for (i = 0; i < users; i++)
{
flood[i].nick = 0;
flood[i].cnt = 0;
flood[i].flood = 0;
}
}
if (users == 0)
return (1);
for (i = 0; i < users; i++)
{
if (flood[i].nick && *(flood[i].nick))
{
if ((my_stricmp(nick, flood[i].nick) == 0) &&
(type == flood[i].type))
break;
}
}
flood_time = time(0);
if (i == users)
{
pos = (pos + 1) % users;
tmp = &(flood[pos]);
tmp->nick = 0;
malloc_strcpy(&tmp->nick, nick);
tmp->type = type;
tmp->cnt = 1;
tmp->start = flood_time;
tmp->flood = 0;
return (1);
}
else
tmp = &(flood[i]);
tmp->cnt++;
diff = flood_time - tmp->start;
if (tmp->cnt > get_int_var(FLOOD_AFTER_VAR))
{
if ((diff == 0) || (tmp->cnt / diff) >
get_int_var(FLOOD_RATE_VAR))
{
if (tmp->flood == 0)
{
if (get_int_var(FLOOD_WARNING_VAR))
say("%s flooding detected from %s",
ignore_types[type], nick);
tmp->flood = 1;
}
return (do_hook(FLOOD_LIST, "%s %s %s %s", nick,
to, ignore_types[type], line));
}
else
{
tmp->flood = 0;
tmp->cnt = 1;
tmp->start = flood_time;
}
}
return (1);
}
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