mirror of
https://github.com/matrix-construct/construct
synced 2024-11-27 01:02:46 +01:00
133 lines
3.8 KiB
C
133 lines
3.8 KiB
C
/*
|
|
* charybdis: an advanced ircd
|
|
* ratelimit.c: Per-client ratelimiting for high-bandwidth commands.
|
|
*
|
|
* Copyright (c) 2012 Keith Buck <mr_flea -at- esper.net>
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice is present in all copies.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
|
|
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "stdinc.h"
|
|
#include "s_conf.h"
|
|
#include "s_stats.h"
|
|
#include "ratelimit.h"
|
|
#include "s_assert.h"
|
|
|
|
/*
|
|
* ratelimit_client(struct Client *client_p, int penalty)
|
|
*
|
|
* Applies a penalty to a client for executing a rate-limited command.
|
|
*
|
|
* Inputs:
|
|
* - the client to be rate-limited
|
|
* - the penalty to apply
|
|
*
|
|
* Outputs:
|
|
* - 1 if the user has been penalized and the command should be
|
|
* allowed to execute
|
|
* - 0 if the command should not execute and the user has not
|
|
* been penalized (they are executing commands too fast and have
|
|
* been rate-limited)
|
|
* The caller should return RPL_LOAD2HI
|
|
*
|
|
* Side effects:
|
|
* - The ratelimit for the user will be initialized if it hasn't
|
|
* been initialized yet.
|
|
*/
|
|
int ratelimit_client(struct Client *client_p, unsigned int penalty)
|
|
{
|
|
s_assert(client_p);
|
|
s_assert(MyClient(client_p));
|
|
|
|
if (!client_p->localClient->ratelimit)
|
|
{
|
|
/* Not initialized yet - do it now. */
|
|
client_p->localClient->ratelimit = rb_current_time() - ConfigFileEntry.max_ratelimit_tokens;
|
|
}
|
|
|
|
/* Don't make it impossible to execute anything. */
|
|
if (penalty > (unsigned int)ConfigFileEntry.max_ratelimit_tokens)
|
|
penalty = ConfigFileEntry.max_ratelimit_tokens;
|
|
|
|
if (client_p->localClient->ratelimit <= rb_current_time() - ConfigFileEntry.max_ratelimit_tokens)
|
|
{
|
|
client_p->localClient->ratelimit = rb_current_time() - ConfigFileEntry.max_ratelimit_tokens + penalty;
|
|
return 1;
|
|
}
|
|
|
|
if (client_p->localClient->ratelimit + penalty > rb_current_time())
|
|
{
|
|
ServerStats.is_rl++;
|
|
return 0;
|
|
}
|
|
|
|
client_p->localClient->ratelimit += penalty;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* ratelimit_client_who(struct Client *client_p, int penalty)
|
|
*
|
|
* Rate-limits a client for a WHO query if they have no remaining "free"
|
|
* WHO queries to execute.
|
|
*
|
|
* Inputs:
|
|
* - same as ratelimit_client
|
|
*
|
|
* Outputs:
|
|
* - same as ratelimit_client
|
|
*
|
|
* Side effects:
|
|
* - A "free who" token will be removed from the user if one exists.
|
|
* If one doesn't exist, the user will be ratelimited as normal.
|
|
*/
|
|
int ratelimit_client_who(struct Client *client_p, unsigned int penalty)
|
|
{
|
|
s_assert(client_p);
|
|
s_assert(MyClient(client_p));
|
|
|
|
if (client_p->localClient->join_who_credits)
|
|
{
|
|
--client_p->localClient->join_who_credits;
|
|
return 1;
|
|
}
|
|
|
|
return ratelimit_client(client_p, penalty);
|
|
}
|
|
|
|
/*
|
|
* credit_client_join(struct Client *client_p)
|
|
*
|
|
* Gives a user a credit to execute a WHO for joining a channel.
|
|
*
|
|
* Inputs:
|
|
* - the client to be credited
|
|
*
|
|
* Outputs:
|
|
* - (none)
|
|
*
|
|
* Side effects:
|
|
* - (none)
|
|
*/
|
|
void credit_client_join(struct Client *client_p)
|
|
{
|
|
s_assert(client_p);
|
|
s_assert(MyClient(client_p));
|
|
|
|
++client_p->localClient->join_who_credits;
|
|
}
|