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ircu2/ircd/m_ping.c

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/*
* IRC - Internet Relay Chat, ircd/m_ping.c
* Copyright (C) 1990 Jarkko Oikarinen and
* University of Oulu, Computing Center
*
* See file AUTHORS in IRC package for additional names of
* the programmers.
*
* 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
* the Free Software Foundation; either version 1, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: m_ping.c 1477 2005-09-11 17:40:21Z decampos $
*/
/*
* Stupid ircd Tricks
* Excerpt from conversation on #coder-com:
* > the number horks it
* <Gte-> yea
* > thinks it's a numeric?
* > no
* <Gte-> hm
* > why would the number hork it
* <Gte-> why is it even looking up servers in a client ping :)
* > it's a server ping
* <Gte-> true
* > oh
* > I know why :)
* > origin = parv[1];
* > destination = parv[2];
* > acptr = FindClient(origin);
* > if (acptr && acptr != sptr)
* > origin = cptr->name;
* > heh, that's a bug :)
* <Gte-> yea, client/server handling in the same function sucks :P
* > blindly pass a bogus origin around, and where do you send the reply to?
* <Gte-> I tried /quote ping 12345 uworld.blah.net locally, and uworld
* +recieved -> ":Gte- PING N :Uworld.blah.net"
* <Gte-> oh no, sorry, I did ping N :)
* > right, it's broken
* <Gte-> good thing it doesn't have a fit replying to it
* > hmm
* *** plano.tx.us.undernet.org: PONG received from plano.tx.us.undernet.org
* > you can send a number for the first ping .. but if you ping a remote server
* +it goes to the remote end where it's received as a unsolicited pong by the
* +server closest to the target
* > hahaha
* <Gte-> cool
* <Gte-> Parsing: :Gte PING 12345 :widnes.uk.eu.blah.net
* <Gte-> Sending [:widnes.uk.eu.blah.net PONG widnes.uk.eu.blah.net
* +:12345] to alphatest.blah.net
* <Gte-> Parsing: :alphatest.blah.net 402 widnes.uk.eu.blah.net
* +12345 :No such server
* > oh even better, the pongee sends no such server :)
* > bwhahahah
* <Gte-> for a second, I thought you could trigger a loop, which would be
* +hideously nasty, but it doesn't look like
* > it goes a ------ > b ------- > c ------- > d then c <------- d then c -----
* +> d :)
* <Gte-> weeee
* <Gte-> [04:15] -> Server: ping Gte- Dallas-R.Tx.US.Undernet.org
* <Gte-> *** PONG from Dallas-R.Tx.US.Undernet.org: Gte-
* <Gte-> there we go
* <Gte-> I can get a ping reply from a server I'm not on :)
*/
/*
* m_functions execute protocol messages on this server:
*
* cptr is always NON-NULL, pointing to a *LOCAL* client
* structure (with an open socket connected!). This
* identifies the physical socket where the message
* originated (or which caused the m_function to be
* executed--some m_functions may call others...).
*
* sptr is the source of the message, defined by the
* prefix part of the message if present. If not
* or prefix not found, then sptr==cptr.
*
* (!IsServer(cptr)) => (cptr == sptr), because
* prefixes are taken *only* from servers...
*
* (IsServer(cptr))
* (sptr == cptr) => the message didn't
* have the prefix.
*
* (sptr != cptr && IsServer(sptr) means
* the prefix specified servername. (?)
*
* (sptr != cptr && !IsServer(sptr) means
* that message originated from a remote
* user (not local).
*
* combining
*
* (!IsServer(sptr)) means that, sptr can safely
* taken as defining the target structure of the
* message in this server.
*
* *Always* true (if 'parse' and others are working correct):
*
* 1) sptr->from == cptr (note: cptr->from == cptr)
*
* 2) MyConnect(sptr) <=> sptr == cptr (e.g. sptr
* *cannot* be a local connection, unless it's
* actually cptr!). [MyConnect(x) should probably
* be defined as (x == x->from) --msa ]
*
* parc number of variable parameter strings (if zero,
* parv is allowed to be NULL)
*
* parv a NULL terminated list of parameter pointers,
*
* parv[0], sender (prefix string), if not present
* this points to an empty string.
* parv[1]...parv[parc-1]
* pointers to additional parameters
* parv[parc] == NULL, *always*
*
* note: it is guaranteed that parv[0]..parv[parc-1] are all
* non-NULL pointers.
*/
#include "config.h"
#include "client.h"
#include "hash.h"
#include "ircd_log.h"
#include "ircd_reply.h"
#include "ircd_string.h"
#include "ircd.h"
#include "msg.h"
#include "numeric.h"
#include "numnicks.h"
#include "opercmds.h"
#include "s_debug.h"
#include "send.h"
/* #include <assert.h> -- Now using assert in ircd_log.h */
#include <stdlib.h>
#include <string.h>
/*
* m_ping - generic message handler
*
* parv[0] = sender prefix
* parv[1] = origin
* parv[2] = destination
*/
int m_ping(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
assert(0 != cptr);
assert(cptr == sptr);
if (parc < 2 || EmptyString(parv[1]))
return send_reply(sptr, ERR_NOORIGIN);
sendcmdto_one(&me, CMD_PONG, sptr, "%C :%s", &me, parv[1]);
return 0;
}
/*
* mo_ping - oper message handler
*
* parv[0] = sender prefix
* parv[1] = origin
* parv[2] = destination
*/
int mo_ping(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
struct Client* acptr;
char *destination;
assert(0 != cptr);
assert(cptr == sptr);
if (parc < 2 || EmptyString(parv[1]))
return send_reply(sptr, ERR_NOORIGIN);
destination = parv[2]; /* Will get NULL or pointer (parc >= 2!!) */
if (!EmptyString(destination) && 0 != ircd_strcmp(destination, cli_name(&me))) {
if ((acptr = FindServer(destination)))
sendcmdto_one(sptr, CMD_PING, acptr, "%C :%s", sptr, destination);
else
send_reply(sptr, ERR_NOSUCHSERVER, destination);
}
else {
/*
* NOTE: clients rely on this to return the origin string.
* it's pointless to send more than 64 bytes back tho'
*/
char* origin = parv[1];
/* Is this supposed to be here? */
acptr = FindClient(origin);
if (acptr && acptr != sptr)
origin = cli_name(cptr);
if (strlen(origin) > 64)
origin[64] = '\0';
sendcmdto_one(&me, CMD_PONG, sptr, "%C :%s", &me, origin);
}
return 0;
}
/*
* Extension notes
*
* <Vek> bleep: here's the change you make to PING:
* <Vek> F TOK_PING F G 7777777777.7777777
* <Vek> then optional parameter for further enhancement
* <Vek> G TOK_PONG G F 7777777777.7777777 0.1734637
*/
/*
* ms_ping - server message handler
*/
int ms_ping(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
struct Client* acptr;
char* origin;
char* destination;
assert(0 != cptr);
assert(0 != sptr);
assert(IsServer(cptr));
if (parc < 2 || EmptyString(parv[1])) {
/*
* don't bother sending the error back
*/
return 0;
}
origin = parv[1];
destination = parv[2]; /* Will get NULL or pointer (parc >= 2!!) */
if (parc > 3)
{
/* AsLL ping, send reply back */
int diff = atoi(militime_float(parv[3]));
sendcmdto_one(&me, CMD_PONG, sptr, "%C %s %s %i %s", &me, origin,
parv[3], diff, militime_float(NULL));
return 0;
}
if (!EmptyString(destination) && 0 != ircd_strcmp(destination, cli_name(&me))) {
if ((acptr = FindServer(destination))) {
/*
* Servers can just forward the origin
*/
sendcmdto_one(sptr, CMD_PING, acptr, "%s :%s", origin, destination);
}
else {
/*
* this can happen if server split before the ping got here
*/
send_reply(sptr, ERR_NOSUCHSERVER, destination);
}
}
else {
/*
* send pong back
* NOTE: sptr is never local so if pong handles numerics everywhere we
* could send a numeric here.
*/
sendcmdto_one(&me, CMD_PONG, sptr, "%C :%s", &me, origin);
}
return 0;
}
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