2 * IRC - Internet Relay Chat, ircd/m_ping.c
3 * Copyright (C) 1990 Jarkko Oikarinen and
4 * University of Oulu, Computing Center
6 * See file AUTHORS in IRC package for additional names of
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 1, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 * Excerpt from conversation on #coder-com:
29 * > the number horks it
31 * > thinks it's a numeric?
34 * > why would the number hork it
35 * <Gte-> why is it even looking up servers in a client ping :)
36 * > it's a server ping
41 * > destination = parv[2];
42 * > acptr = FindClient(origin);
43 * > if (acptr && acptr != sptr)
44 * > origin = cptr->name;
45 * > heh, that's a bug :)
46 * <Gte-> yea, client/server handling in the same function sucks :P
47 * > blindly pass a bogus origin around, and where do you send the reply to?
48 * <Gte-> I tried /quote ping 12345 uworld.blah.net locally, and uworld
49 * +recieved -> ":Gte- PING N :Uworld.blah.net"
50 * <Gte-> oh no, sorry, I did ping N :)
51 * > right, it's broken
52 * <Gte-> good thing it doesn't have a fit replying to it
54 * *** plano.tx.us.undernet.org: PONG received from plano.tx.us.undernet.org
55 * > you can send a number for the first ping .. but if you ping a remote server
56 * +it goes to the remote end where it's received as a unsolicited pong by the
57 * +server closest to the target
60 * <Gte-> Parsing: :Gte PING 12345 :widnes.uk.eu.blah.net
61 * <Gte-> Sending [:widnes.uk.eu.blah.net PONG widnes.uk.eu.blah.net
62 * +:12345] to alphatest.blah.net
63 * <Gte-> Parsing: :alphatest.blah.net 402 widnes.uk.eu.blah.net
64 * +12345 :No such server
65 * > oh even better, the pongee sends no such server :)
67 * <Gte-> for a second, I thought you could trigger a loop, which would be
68 * +hideously nasty, but it doesn't look like
69 * > it goes a ------ > b ------- > c ------- > d then c <------- d then c -----
72 * <Gte-> [04:15] -> Server: ping Gte- Dallas-R.Tx.US.Undernet.org
73 * <Gte-> *** PONG from Dallas-R.Tx.US.Undernet.org: Gte-
75 * <Gte-> I can get a ping reply from a server I'm not on :)
78 * m_functions execute protocol messages on this server:
80 * cptr is always NON-NULL, pointing to a *LOCAL* client
81 * structure (with an open socket connected!). This
82 * identifies the physical socket where the message
83 * originated (or which caused the m_function to be
84 * executed--some m_functions may call others...).
86 * sptr is the source of the message, defined by the
87 * prefix part of the message if present. If not
88 * or prefix not found, then sptr==cptr.
90 * (!IsServer(cptr)) => (cptr == sptr), because
91 * prefixes are taken *only* from servers...
94 * (sptr == cptr) => the message didn't
97 * (sptr != cptr && IsServer(sptr) means
98 * the prefix specified servername. (?)
100 * (sptr != cptr && !IsServer(sptr) means
101 * that message originated from a remote
106 * (!IsServer(sptr)) means that, sptr can safely
107 * taken as defining the target structure of the
108 * message in this server.
110 * *Always* true (if 'parse' and others are working correct):
112 * 1) sptr->from == cptr (note: cptr->from == cptr)
114 * 2) MyConnect(sptr) <=> sptr == cptr (e.g. sptr
115 * *cannot* be a local connection, unless it's
116 * actually cptr!). [MyConnect(x) should probably
117 * be defined as (x == x->from) --msa ]
119 * parc number of variable parameter strings (if zero,
120 * parv is allowed to be NULL)
122 * parv a NULL terminated list of parameter pointers,
124 * parv[0], sender (prefix string), if not present
125 * this points to an empty string.
126 * parv[1]...parv[parc-1]
127 * pointers to additional parameters
128 * parv[parc] == NULL, *always*
130 * note: it is guaranteed that parv[0]..parv[parc-1] are all
137 * No need to include handlers.h here the signatures must match
138 * and we don't need to force a rebuild of all the handlers everytime
139 * we add a new one to the list. --Bleep
141 #include "handlers.h"
145 #include "ircd_reply.h"
146 #include "ircd_string.h"
150 #include "numnicks.h"
158 * m_ping - generic message handler
160 * parv[0] = sender prefix
162 * parv[2] = destination
164 int m_ping(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
166 struct Client* acptr;
169 assert(cptr == sptr);
171 if (parc < 2 || EmptyString(parv[1]))
172 return send_reply(sptr, ERR_NOORIGIN);
174 destination = parv[2]; /* Will get NULL or pointer (parc >= 2!!) */
176 if (!EmptyString(destination) && 0 != ircd_strcmp(destination, cli_name(&me))) {
177 if ((acptr = FindServer(destination)))
178 sendcmdto_one(sptr, CMD_PING, acptr, "%C :%s", sptr, destination);
180 send_reply(sptr, ERR_NOSUCHSERVER, destination);
184 * NOTE: clients rely on this to return the origin string.
185 * it's pointless to send more than 64 bytes back tho'
187 char* origin = parv[1];
189 /* Is this supposed to be here? */
190 acptr = FindClient(origin);
191 if (acptr && acptr != sptr)
192 origin = cli_name(cptr);
194 if (strlen(origin) > 64)
196 sendcmdto_one(&me, CMD_PONG, sptr, "%C :%s", &me, origin);
204 * <Vek> bleep: here's the change you make to PING:
205 * <Vek> F TOK_PING F G 7777777777.7777777
206 * <Vek> then optional parameter for further enhancement
207 * <Vek> G TOK_PONG G F 7777777777.7777777 0.1734637
211 * ms_ping - server message handler template
213 int ms_ping(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
215 struct Client* acptr;
221 assert(IsServer(cptr));
223 if (parc < 2 || EmptyString(parv[1])) {
225 * don't bother sending the error back
230 destination = parv[2]; /* Will get NULL or pointer (parc >= 2!!) */
232 if (!EmptyString(destination) && 0 != ircd_strcmp(destination, cli_name(&me))) {
233 if ((acptr = FindServer(destination))) {
235 * Servers can just forward the origin
237 sendcmdto_one(sptr, CMD_PING, acptr, "%s :%s", origin, destination);
241 * this can happen if server split before the ping got here
243 send_reply(sptr, ERR_NOSUCHSERVER, destination);
249 * NOTE: sptr is never local so if pong handles numerics everywhere we
250 * could send a numeric here.
252 sendcmdto_one(&me, CMD_PONG, sptr, "%C :%s", &me, origin);
262 * parv[0] = sender prefix
264 * parv[2] = destination
266 int m_ping(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
268 struct Client *acptr;
269 char *origin, *destination;
271 if (parc < 2 || *parv[1] == '\0')
273 sendto_one(sptr, err_str(ERR_NOORIGIN), me.name, parv[0]); /* XXX DEAD */
277 destination = parv[2]; /* Will get NULL or pointer (parc >= 2!!) */
279 acptr = FindClient(origin);
280 if (acptr && acptr != sptr)
283 if (!EmptyString(destination) && 0 != ircd_strcmp(destination, me.name) != 0)
285 if ((acptr = FindServer(destination)))
286 sendto_one(acptr, ":%s PING %s :%s", parv[0], origin, destination); /* XXX DEAD */
289 sendto_one(sptr, err_str(ERR_NOSUCHSERVER), /* XXX DEAD */
290 me.name, parv[0], destination);
295 sendto_one(sptr, ":%s PONG %s :%s", me.name, me.name, origin); /* XXX DEAD */