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