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connavg.c
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connavg.c
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/*
* Copyright (c) 2011 Alexandria Wolcott
* Rights to this code are documented in doc/LICENSE.
*
* This file contains functionality for alerting on large connections.
*
*/
#include "atheme.h"
#include "conf.h"
#include <limits.h>
static void connavg_newuser(hook_user_nick_t *data);
static void connavg_configready(void *unused);
static void os_cmd_connavg(sourceinfo_t *si, int parc, char *parv[]);
typedef struct
{
int connections;
int peak_time;
int peak_conn;
int alert_time;
int check_time;
} state;
state s;
unsigned int safe_connections = 0;
DECLARE_MODULE_V1
(
"operserv/connavg", false, _modinit, _moddeinit,
PACKAGE_STRING,
"Alexandria Wolcott <alyx@sporksmoo.net>"
);
command_t os_connavg = { "CONNAVG", N_("Monitors the network for unusual connection fluxuations."), PRIV_SERVER_AUSPEX, 1, os_cmd_connavg, { .path = "oservice/connavg" } };
static void reset_connections(void)
{
s.connections = 0;
s.check_time = time(NULL);
}
void _modinit(module_t *m)
{
service_named_bind_command("operserv", &os_connavg);
hook_add_event("user_add");
hook_add_user_add(connavg_newuser);
add_uint_conf_item("SAFE_CONNECTIONS", &conf_gi_table, 0, &safe_connections, 1, INT_MAX, 5);
event_add("reset_connections", reset_connections, NULL, 60);
}
void _moddeinit(module_unload_intent_t intent)
{
service_named_unbind_command("operserv", &os_connavg);
hook_del_user_add(connavg_newuser);
hook_del_event("user_add");
del_conf_item("SAFE_CONNECTIONS", &conf_gi_table);
event_delete(reset_connections, NULL);
}
static void os_cmd_connavg(sourceinfo_t *si, int parc, char *parv[])
{
command_success_nodata(si, _("Connections in the last minute: %d"), s.connections);
if (s.peak_time != 0)
command_success_nodata(si, _("Peak connections: %d (Reached %s ago)"), s.peak_conn, time_ago(s.peak_time));
command_success_nodata(si, _("Configuration alert level: %d"), safe_connections);
if (s.alert_time != 0)
command_success_nodata(si, _("Alert peak last broken: %s ago"), time_ago(s.alert_time));
else
command_success_nodata(si, _("Alert peak last broken: never"));
logcommand(si, CMDLOG_GET, "CONNAVG");
}
static void connavg_newuser(hook_user_nick_t *data)
{
user_t *u = data->u;
/* If the user has been killed, don't do anything. */
if (!(u))
return;
/* If the user is an internal client, still don't do anything. */
if (is_internal_client(u))
return;
/* Most likely, we will have a massive influx in connections when bursts happen; skip those. */
if (me.bursting)
return;
s.connections++;
if (s.connections > safe_connections)
{
/* Send a warning every five connects greater than the "safe" connection allowence. */
if (s.connections % 5 == 0) {
wallops("WARNING! Connections in the last minute was %d, which is above the maxium safe connections of %d per minute!",
s.connections, safe_connections);
s.alert_time = time(NULL);
}
}
if (s.connections > s.peak_conn)
{
s.peak_conn = s.connections;
s.peak_time = time(NULL);
}
}
/* vim:cinoptions=>s,e0,n0,f0,{0,}0,^0,=s,ps,t0,c3,+s,(2s,us,)20,*30,gs,hs
* vim:ts=8
* vim:sw=8
* vim:noexpandtab
*/