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Trying to fix packet.c

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This commit is contained in:
Valery Yatsko 2008-04-02 16:31:17 +04:00
parent 87116eca09
commit 4714a17f54
3 changed files with 363 additions and 478 deletions
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1
include/client.h
View file

@ -627,6 +627,7 @@ extern void close_connection(struct Client *);
extern void init_uid(void); extern void init_uid(void);
extern char *generate_uid(void); extern char *generate_uid(void);
void flood_endgrace(struct Client *);
void allocate_away(struct Client *); void allocate_away(struct Client *);
void free_away(struct Client *); void free_away(struct Client *);

7
include/packet.h
View file

@ -46,9 +46,8 @@
#define MAX_FLOOD 5 #define MAX_FLOOD 5
#define MAX_FLOOD_BURST MAX_FLOOD * 8 #define MAX_FLOOD_BURST MAX_FLOOD * 8
extern PF read_ctrl_packet; extern PF read_ctrl_packet;
extern PF read_packet; extern PF read_packet;
extern PF flood_recalc; extern EVH flood_recalc;
extern void flood_endgrace(struct Client *);
#endif /* INCLUDED_packet_h */ #endif /* INCLUDED_packet_h */

833
src/packet.c
View file

@ -1,474 +1,359 @@
/* /*
* ircd-ratbox: A slightly useful ircd. * ircd-ratbox: A slightly useful ircd.
* packet.c: Packet handlers. * packet.c: Packet handlers.
* *
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
* Copyright (C) 1996-2002 Hybrid Development Team * Copyright (C) 1996-2002 Hybrid Development Team
* Copyright (C) 2002-2005 ircd-ratbox development team * Copyright (C) 2002-2005 ircd-ratbox development team
* *
* This program is free software; you can redistribute it and/or modify * This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by * it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or * the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version. * (at your option) any later version.
* *
* This program is distributed in the hope that it will be useful, * This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of * but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details. * GNU General Public License for more details.
* *
* You should have received a copy of the GNU General Public License * You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software * along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA * USA
* *
* $Id: packet.c 3446 2007-05-14 22:21:16Z jilles $ * $Id: packet.c 25179 2008-03-30 16:34:57Z androsyn $
*/ */
#include "stdinc.h" #include "stdinc.h"
#include "s_conf.h" #include "struct.h"
#include "s_serv.h" #include "s_conf.h"
#include "client.h" #include "s_serv.h"
#include "common.h" #include "client.h"
#include "ircd.h" #include "ircd.h"
#include "parse.h" #include "parse.h"
#include "packet.h" #include "packet.h"
#include "irc_string.h" #include "match.h"
#include "hook.h" #include "hook.h"
#include "send.h" #include "send.h"
static char readBuf[READBUF_SIZE]; static char readBuf[READBUF_SIZE];
static void client_dopacket(struct Client *client_p, char *buffer, size_t length); static void client_dopacket(struct Client *client_p, char *buffer, size_t length);
/* /*
* parse_client_queued - parse client queued messages * parse_client_queued - parse client queued messages
*/ */
static void static void
parse_client_queued(struct Client *client_p) parse_client_queued(struct Client *client_p)
{ {
int dolen = 0; int dolen = 0;
int checkflood = 1; int checkflood = 1;
if(IsAnyDead(client_p)) if(IsAnyDead(client_p))
return; return;
if(IsUnknown(client_p)) if(IsUnknown(client_p))
{ {
for (;;) for (;;)
{ {
if(client_p->localClient->sent_parsed >= client_p->localClient->allow_read) if(client_p->localClient->sent_parsed >= client_p->localClient->allow_read)
break; break;
dolen = linebuf_get(&client_p->localClient-> dolen = rb_linebuf_get(&client_p->localClient->
buf_recvq, readBuf, READBUF_SIZE, buf_recvq, readBuf, READBUF_SIZE,
LINEBUF_COMPLETE, LINEBUF_PARSED); LINEBUF_COMPLETE, LINEBUF_PARSED);
if(dolen <= 0 || IsDead(client_p)) if(dolen <= 0 || IsDead(client_p))
break; break;
client_dopacket(client_p, readBuf, dolen); client_dopacket(client_p, readBuf, dolen);
client_p->localClient->sent_parsed++; client_p->localClient->sent_parsed++;
/* He's dead cap'n */ /* He's dead cap'n */
if(IsAnyDead(client_p)) if(IsAnyDead(client_p))
return; return;
/* if theyve dropped out of the unknown state, break and move /* if theyve dropped out of the unknown state, break and move
* to the parsing for their appropriate status. --fl * to the parsing for their appropriate status. --fl
*/ */
if(!IsUnknown(client_p)) if(!IsUnknown(client_p))
{ {
/* reset their flood limits, they're now /* reset their flood limits, they're now
* graced to flood * graced to flood
*/ */
client_p->localClient->sent_parsed = 0; client_p->localClient->sent_parsed = 0;
break; break;
} }
}
} }
}
if(IsAnyServer(client_p) || IsExemptFlood(client_p))
if(IsAnyServer(client_p) || IsExemptFlood(client_p)) {
{ while (!IsAnyDead(client_p) && (dolen = rb_linebuf_get(&client_p->localClient->buf_recvq,
while (!IsAnyDead(client_p) && (dolen = linebuf_get(&client_p->localClient->buf_recvq, readBuf, READBUF_SIZE, LINEBUF_COMPLETE,
readBuf, READBUF_SIZE, LINEBUF_COMPLETE, LINEBUF_PARSED)) > 0)
LINEBUF_PARSED)) > 0) {
{ client_dopacket(client_p, readBuf, dolen);
client_dopacket(client_p, readBuf, dolen); }
} }
} else if(IsClient(client_p))
else if(IsClient(client_p)) {
{
if(IsOper(client_p) && ConfigFileEntry.no_oper_flood)
if(IsOper(client_p) && ConfigFileEntry.no_oper_flood) checkflood = 0;
checkflood = 0; /*
/* * Handle flood protection here - if we exceed our flood limit on
* Handle flood protection here - if we exceed our flood limit on * messages in this loop, we simply drop out of the loop prematurely.
* messages in this loop, we simply drop out of the loop prematurely. * -- adrian
* -- adrian */
*/ for (;;)
for (;;) {
{ /* This flood protection works as follows:
/* This flood protection works as follows: *
* * A client is given allow_read lines to send to the server. Every
* A client is given allow_read lines to send to the server. Every * time a line is parsed, sent_parsed is increased. sent_parsed
* time a line is parsed, sent_parsed is increased. sent_parsed * is decreased by 1 every time flood_recalc is called.
* is decreased by 1 every time flood_recalc is called. *
* * Thus a client can 'burst' allow_read lines to the server, any
* Thus a client can 'burst' allow_read lines to the server, any * excess lines will be parsed one per flood_recalc() call.
* excess lines will be parsed one per flood_recalc() call. *
* * Therefore a client will be penalised more if they keep flooding,
* Therefore a client will be penalised more if they keep flooding, * as sent_parsed will always hover around the allow_read limit
* as sent_parsed will always hover around the allow_read limit * and no 'bursts' will be permitted.
* and no 'bursts' will be permitted. */
*/ if(checkflood)
if(checkflood) {
{ if(client_p->localClient->sent_parsed >= client_p->localClient->allow_read)
if(client_p->localClient->sent_parsed >= client_p->localClient->allow_read) break;
break; }
}
/* allow opers 4 times the amount of messages as users. why 4?
/* allow opers 4 times the amount of messages as users. why 4? * why not. :) --fl_
* why not. :) --fl_ */
*/ else if(client_p->localClient->sent_parsed >= (4 * client_p->localClient->allow_read))
else if(client_p->localClient->sent_parsed >= (4 * client_p->localClient->allow_read)) break;
break;
dolen = rb_linebuf_get(&client_p->localClient->
dolen = linebuf_get(&client_p->localClient-> buf_recvq, readBuf, READBUF_SIZE,
buf_recvq, readBuf, READBUF_SIZE, LINEBUF_COMPLETE, LINEBUF_PARSED);
LINEBUF_COMPLETE, LINEBUF_PARSED);
if(!dolen)
if(!dolen) break;
break;
client_dopacket(client_p, readBuf, dolen);
client_dopacket(client_p, readBuf, dolen); if(IsAnyDead(client_p))
if(IsAnyDead(client_p)) return;
return; client_p->localClient->sent_parsed++;
client_p->localClient->sent_parsed++; }
} }
} }
}
/*
/* flood_endgrace() * flood_recalc
* *
* marks the end of the clients grace period * recalculate the number of allowed flood lines. this should be called
*/ * once a second on any given client. We then attempt to flush some data.
void */
flood_endgrace(struct Client *client_p) void
{ flood_recalc(void *unused)
SetFloodDone(client_p); {
rb_dlink_node *ptr, *next;
/* Drop their flood limit back down */ struct Client *client_p;
client_p->localClient->allow_read = MAX_FLOOD;
RB_DLINK_FOREACH_SAFE(ptr, next, lclient_list.head)
/* sent_parsed could be way over MAX_FLOOD but under MAX_FLOOD_BURST, {
* so reset it. client_p = ptr->data;
*/
client_p->localClient->sent_parsed = 0; if(unlikely(IsMe(client_p)))
} continue;
/* if(unlikely(client_p->localClient == NULL))
* flood_recalc continue;
*
* recalculate the number of allowed flood lines. this should be called if(IsFloodDone(client_p))
* once a second on any given client. We then attempt to flush some data. client_p->localClient->sent_parsed -= 2;
*/ else
void client_p->localClient->sent_parsed = 0;
flood_recalc(int fd, void *data)
{ if(client_p->localClient->sent_parsed < 0)
struct Client *client_p = data; client_p->localClient->sent_parsed = 0;
struct LocalUser *lclient_p = client_p->localClient;
if(--client_p->localClient->actually_read < 0)
/* This can happen in the event that the client detached. */ client_p->localClient->actually_read = 0;
if(!lclient_p)
return; parse_client_queued(client_p);
/* allow a bursting client their allocation per second, allow if(unlikely(IsAnyDead(client_p)))
* a client whos flooding an extra 2 per second continue;
*/
if(IsFloodDone(client_p)) }
lclient_p->sent_parsed -= 2;
else RB_DLINK_FOREACH_SAFE(ptr, next, unknown_list.head)
lclient_p->sent_parsed = 0; {
client_p = ptr->data;
if(lclient_p->sent_parsed < 0)
lclient_p->sent_parsed = 0; if(client_p->localClient == NULL)
continue;
if(--lclient_p->actually_read < 0)
lclient_p->actually_read = 0; client_p->localClient->sent_parsed--;
parse_client_queued(client_p); if(client_p->localClient->sent_parsed < 0)
client_p->localClient->sent_parsed = 0;
if(IsAnyDead(client_p))
return; if(--client_p->localClient->actually_read < 0)
client_p->localClient->actually_read = 0;
/* and finally, reset the flood check */
rb_setflush(fd, 1000, flood_recalc, client_p); parse_client_queued(client_p);
} }
}
/*
* read_ctrl_packet - Read a 'packet' of data from a servlink control
* link and process it. /*
*/ * read_packet - Read a 'packet' of data from a connection and process it.
void */
read_ctrl_packet(int fd, void *data) void
{ read_packet(rb_fde_t *F, void *data)
struct Client *server = data; {
struct LocalUser *lserver = server->localClient; struct Client *client_p = data;
struct SlinkRpl *reply; struct LocalUser *lclient_p = client_p->localClient;
int length = 0; int length = 0;
unsigned char tmp[2]; int lbuf_len;
unsigned char *len = tmp;
struct SlinkRplDef *replydef; int binary = 0;
#ifdef USE_IODEBUG_HOOKS #ifdef USE_IODEBUG_HOOKS
hook_data_int hdata; hook_data_int hdata;
#endif #endif
s_assert(lserver != NULL);
if(IsAnyDead(server)) while(1) /* note..for things like rt sigio to work you *must* loop on read until you get EAGAIN */
return; {
if(IsAnyDead(client_p))
reply = &lserver->slinkrpl; return;
/*
if(!reply->command) * Read some data. We *used to* do anti-flood protection here, but
{ * I personally think it makes the code too hairy to make sane.
reply->gotdatalen = 0; * -- adrian
reply->readdata = 0; */
reply->data = NULL; length = rb_read(client_p->localClient->F, readBuf, READBUF_SIZE);
if(length < 0)
length = read(fd, tmp, 1); {
if(rb_ignore_errno(errno))
if(length <= 0) {
{ rb_setselect(client_p->localClient->F,
if((length == -1) && ignoreErrno(errno)) RB_SELECT_READ, read_packet, client_p);
goto nodata; } else
error_exit_client(server, length); error_exit_client(client_p, length);
return; return;
} } else
if(length == 0)
reply->command = tmp[0]; {
} error_exit_client(client_p, length);
return;
for (replydef = slinkrpltab; replydef->handler; replydef++) }
{
if((int)replydef->replyid == reply->command) #ifdef USE_IODEBUG_HOOKS
break; hdata.client = client_p;
} hdata.arg1 = readBuf;
hdata.arg2 = length;
/* we should be able to trust a local slink process... call_hook(h_iorecv_id, &hdata);
* and if it sends an invalid command, that's a bug.. */ #endif
s_assert(replydef->handler);
if(client_p->localClient->lasttime < rb_current_time())
if((replydef->flags & SLINKRPL_FLAG_DATA) && (reply->gotdatalen < 2)) client_p->localClient->lasttime = rb_current_time();
{ client_p->flags &= ~FLAGS_PINGSENT;
/* we need a datalen u16 which we don't have yet... */
length = read(fd, len, (2 - reply->gotdatalen)); /*
if(length <= 0) * Before we even think of parsing what we just read, stick
{ * it on the end of the receive queue and do it when its
if((length == -1) && ignoreErrno(errno)) * turn comes around.
goto nodata; */
error_exit_client(server, length); if(IsHandshake(client_p) || IsUnknown(client_p))
return; binary = 1;
}
lbuf_len = rb_linebuf_parse(&client_p->localClient->buf_recvq, readBuf, length, binary);
if(reply->gotdatalen == 0)
{ lclient_p->actually_read += lbuf_len;
reply->datalen = *len << 8;
reply->gotdatalen++; if(IsAnyDead(client_p))
length--; return;
len++;
} /* Attempt to parse what we have */
if(length && (reply->gotdatalen == 1)) parse_client_queued(client_p);
{
reply->datalen |= *len; if(IsAnyDead(client_p))
reply->gotdatalen++; return;
if(reply->datalen > 0)
reply->data = rb_malloc(reply->datalen); /* Check to make sure we're not flooding */
} if(!IsAnyServer(client_p) &&
(rb_linebuf_alloclen(&client_p->localClient->buf_recvq) > ConfigFileEntry.client_flood))
if(reply->gotdatalen < 2) {
return; /* wait for more data */ if(!(ConfigFileEntry.no_oper_flood && IsOper(client_p)))
} {
exit_client(client_p, client_p, client_p, "Excess Flood");
if(reply->readdata < reply->datalen) /* try to get any remaining data */ return;
{ }
length = read(fd, (reply->data + reply->readdata),
(reply->datalen - reply->readdata)); }
if(length <= 0)
{ /* bail if short read */
if((length == -1) && ignoreErrno(errno)) if(length < READBUF_SIZE)
goto nodata; {
error_exit_client(server, length); rb_setselect(client_p->localClient->F, RB_SELECT_READ, read_packet, client_p);
return; return;
} }
}
reply->readdata += length; }
if(reply->readdata < reply->datalen)
return; /* wait for more data */ /*
} * client_dopacket - copy packet to client buf and parse it
* client_p - pointer to client structure for which the buffer data
#ifdef USE_IODEBUG_HOOKS * applies.
hdata.client = server; * buffer - pointr to the buffer containing the newly read data
hdata.arg1 = NULL; * length - number of valid bytes of data in the buffer
hdata.arg2 = reply->command; *
hdata.data = NULL; * Note:
call_hook(h_iorecvctrl_id, &hdata); * It is implicitly assumed that dopacket is called only
#endif * with client_p of "local" variation, which contains all the
* necessary fields (buffer etc..)
/* we now have the command and any data, pass it off to the handler */ */
(*replydef->handler) (reply->command, reply->datalen, reply->data, server); void
client_dopacket(struct Client *client_p, char *buffer, size_t length)
/* reset SlinkRpl */ {
if(reply->datalen > 0) s_assert(client_p != NULL);
rb_free(reply->data); s_assert(buffer != NULL);
reply->command = 0;
if(client_p == NULL || buffer == NULL)
if(IsAnyDead(server)) return;
return; if(IsAnyDead(client_p))
return;
nodata: /*
/* If we get here, we need to register for another COMM_SELECT_READ */ * Update messages received
rb_setselect(fd, FDLIST_SERVER, COMM_SELECT_READ, read_ctrl_packet, server, 0); */
} ++me.localClient->receiveM;
++client_p->localClient->receiveM;
/*
* read_packet - Read a 'packet' of data from a connection and process it. /*
*/ * Update bytes received
void */
read_packet(int fd, void *data) client_p->localClient->receiveB += length;
{ me.localClient->receiveB += length;
struct Client *client_p = data;
struct LocalUser *lclient_p = client_p->localClient; parse(client_p, buffer, buffer + length);
int length = 0; }
int lbuf_len;
/* flood_endgrace()
int binary = 0; *
#ifdef USE_IODEBUG_HOOKS * marks the end of the clients grace period
hook_data_int hdata; */
#endif void
if(IsAnyDead(client_p)) flood_endgrace(struct Client *client_p)
return; {
SetFloodDone(client_p);
/*
* Read some data. We *used to* do anti-flood protection here, but /* Drop their flood limit back down */
* I personally think it makes the code too hairy to make sane. client_p->localClient->allow_read = MAX_FLOOD;
* -- adrian
*/ /* sent_parsed could be way over MAX_FLOOD but under MAX_FLOOD_BURST,
length = client_p->localClient->F->read_impl(client_p->localClient->F, readBuf, READBUF_SIZE); * so reset it.
*/
if(length <= 0) client_p->localClient->sent_parsed = 0;
{ }
if((length == -1) && ignoreErrno(errno))
{
rb_setselect(client_p->localClient->F->fd, FDLIST_IDLECLIENT,
COMM_SELECT_READ, read_packet, client_p, 0);
return;
}
error_exit_client(client_p, length);
return;
}
#ifdef USE_IODEBUG_HOOKS
hdata.client = client_p;
hdata.arg1 = readBuf;
hdata.arg2 = length;
call_hook(h_iorecv_id, &hdata);
#endif
if(client_p->localClient->lasttime < rb_current_time())
client_p->localClient->lasttime = rb_current_time();
client_p->flags &= ~FLAGS_PINGSENT;
/*
* Before we even think of parsing what we just read, stick
* it on the end of the receive queue and do it when its
* turn comes around.
*/
if(IsHandshake(client_p) || IsUnknown(client_p))
binary = 1;
lbuf_len = linebuf_parse(&client_p->localClient->buf_recvq, readBuf, length, binary);
lclient_p->actually_read += lbuf_len;
if(IsAnyDead(client_p))
return;
/* Attempt to parse what we have */
parse_client_queued(client_p);
if(IsAnyDead(client_p))
return;
/* Check to make sure we're not flooding */
if(!IsAnyServer(client_p) &&
(linebuf_alloclen(&client_p->localClient->buf_recvq) > ConfigFileEntry.client_flood))
{
if(!(ConfigFileEntry.no_oper_flood && IsOper(client_p)))
{
exit_client(client_p, client_p, client_p, "Excess Flood");
return;
}
}
/* If we get here, we need to register for another COMM_SELECT_READ */
if(PARSE_AS_SERVER(client_p))
{
rb_setselect(client_p->localClient->F->fd, FDLIST_SERVER, COMM_SELECT_READ,
read_packet, client_p, 0);
}
else
{
rb_setselect(client_p->localClient->F->fd, FDLIST_IDLECLIENT,
COMM_SELECT_READ, read_packet, client_p, 0);
}
}
/*
* client_dopacket - copy packet to client buf and parse it
* client_p - pointer to client structure for which the buffer data
* applies.
* buffer - pointr to the buffer containing the newly read data
* length - number of valid bytes of data in the buffer
*
* Note:
* It is implicitly assumed that dopacket is called only
* with client_p of "local" variation, which contains all the
* necessary fields (buffer etc..)
*/
void
client_dopacket(struct Client *client_p, char *buffer, size_t length)
{
s_assert(client_p != NULL);
s_assert(buffer != NULL);
if(client_p == NULL || buffer == NULL)
return;
if(IsAnyDead(client_p))
return;
/*
* Update messages received
*/
++me.localClient->receiveM;
++client_p->localClient->receiveM;
/*
* Update bytes received
*/
client_p->localClient->receiveB += length;
if(client_p->localClient->receiveB > 1023)
{
client_p->localClient->receiveK += (client_p->localClient->receiveB >> 10);
client_p->localClient->receiveB &= 0x03ff; /* 2^10 = 1024, 3ff = 1023 */
}
me.localClient->receiveB += length;
if(me.localClient->receiveB > 1023)
{
me.localClient->receiveK += (me.localClient->receiveB >> 10);
me.localClient->receiveB &= 0x03ff;
}
parse(client_p, buffer, buffer + length);
}