1 /*
2 * IRC - Internet Relay Chat, ircd/m_ping.c
3 * Copyright (C) 1990 Jarkko Oikarinen and
4 * University of Oulu, Computing Center
5 *
6 * See file AUTHORS in IRC package for additional names of
7 * the programmers.
8 *
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)
12 * any later version.
13 *
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.
18 *
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.
22 *
23 * $Id$
24 */
25
26 /*
27 * Stupid ircd Tricks
28 * Excerpt from conversation on #coder-com:
29 * > the number horks it
30 * <Gte-> yea
31 * > thinks it's a numeric?
32 * > no
33 * <Gte-> hm
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
37 * <Gte-> true
38 * > oh
39 * > I know why :)
40 * > origin = parv[1];
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
53 * > hmm
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
58 * > hahaha
59 * <Gte-> cool
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 :)
66 * > bwhahahah
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 -----
70 * +> d :)
71 * <Gte-> weeee
72 * <Gte-> [04:15] -> Server: ping Gte- Dallas-R.Tx.US.Undernet.org
73 * <Gte-> *** PONG from Dallas-R.Tx.US.Undernet.org: Gte-
74 * <Gte-> there we go
75 * <Gte-> I can get a ping reply from a server I'm not on :)
76 */
77 /*
78 * m_functions execute protocol messages on this server:
79 *
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...).
85 *
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.
89 *
90 * (!IsServer(cptr)) => (cptr == sptr), because
91 * prefixes are taken *only* from servers...
92 *
93 * (IsServer(cptr))
94 * (sptr == cptr) => the message didn't
95 * have the prefix.
96 *
97 * (sptr != cptr && IsServer(sptr) means
98 * the prefix specified servername. (?)
99 *
100 * (sptr != cptr && !IsServer(sptr) means
101 * that message originated from a remote
102 * user (not local).
103 *
104 * combining
105 *
106 * (!IsServer(sptr)) means that, sptr can safely
107 * taken as defining the target structure of the
108 * message in this server.
109 *
110 * *Always* true (if 'parse' and others are working correct):
111 *
112 * 1) sptr->from == cptr (note: cptr->from == cptr)
113 *
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 ]
118 *
119 * parc number of variable parameter strings (if zero,
120 * parv is allowed to be NULL)
121 *
122 * parv a NULL terminated list of parameter pointers,
123 *
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*
129 *
130 * note: it is guaranteed that parv[0]..parv[parc-1] are all
131 * non-NULL pointers.
132 */
133 #include "config.h"
134
135 #include "client.h"
136 #include "hash.h"
137 #include "ircd_log.h"
138 #include "ircd_reply.h"
139 #include "ircd_string.h"
140 #include "ircd.h"
141 #include "msg.h"
142 #include "numeric.h"
143 #include "numnicks.h"
144 #include "opercmds.h"
145 #include "s_debug.h"
146 #include "send.h"
147
148 /* #include <assert.h> -- Now using assert in ircd_log.h */
149 #include <stdlib.h>
150 #include <string.h>
151
152 /*
153 * m_ping - generic message handler
154 *
155 * parv[0] = sender prefix
156 * parv[1] = origin
157 * parv[2] = destination
158 */
m_ping(struct Client * cptr,struct Client * sptr,int parc,char * parv[])159 int m_ping(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
160 {
161 assert(0 != cptr);
162 assert(cptr == sptr);
163
164 if (parc < 2 || EmptyString(parv[1]))
165 return send_reply(sptr, ERR_NOORIGIN);
166
167 sendcmdto_one(&me, CMD_PONG, sptr, "%C :%s", &me, parv[1]);
168 return 0;
169 }
170
171 /*
172 * mo_ping - oper message handler
173 *
174 * parv[0] = sender prefix
175 * parv[1] = origin
176 * parv[2] = destination
177 */
mo_ping(struct Client * cptr,struct Client * sptr,int parc,char * parv[])178 int mo_ping(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
179 {
180 struct Client* acptr;
181 char *origin;
182 char *destination;
183 assert(0 != cptr);
184 assert(cptr == sptr);
185
186 if (parc < 2 || EmptyString(parv[1]))
187 return send_reply(sptr, ERR_NOORIGIN);
188
189 /* Historically, the text here was truncated to 64 bytes. */
190 origin = parv[1];
191 if (strlen(origin) > 64)
192 origin[64] = '\0';
193 destination = parv[2]; /* Will get NULL or pointer (parc >= 2!!) */
194
195 if (!EmptyString(destination) && 0 != ircd_strcmp(destination, cli_name(&me))) {
196 if ((acptr = FindServer(destination)))
197 sendcmdto_one(sptr, CMD_PING, acptr, "%s :%s", origin, destination);
198 else
199 send_reply(sptr, ERR_NOSUCHSERVER, destination);
200 }
201 else {
202 sendcmdto_one(&me, CMD_PONG, sptr, "%C :%s", &me, origin);
203 }
204 return 0;
205 }
206
207 /*
208 * Extension notes
209 *
210 * <Vek> bleep: here's the change you make to PING:
211 * <Vek> F TOK_PING F G 7777777777.7777777
212 * <Vek> then optional parameter for further enhancement
213 * <Vek> G TOK_PONG G F 7777777777.7777777 0.1734637
214 */
215
216 /*
217 * ms_ping - server message handler
218 */
ms_ping(struct Client * cptr,struct Client * sptr,int parc,char * parv[])219 int ms_ping(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
220 {
221 struct Client* acptr;
222 char* origin;
223 char* destination;
224
225 assert(0 != cptr);
226 assert(0 != sptr);
227 assert(IsServer(cptr));
228
229 if (parc < 2 || EmptyString(parv[1])) {
230 /*
231 * don't bother sending the error back
232 */
233 return 0;
234 }
235 origin = parv[1];
236 destination = parv[2]; /* Will get NULL or pointer (parc >= 2!!) */
237
238 if (parc > 3)
239 {
240 /* AsLL ping, send reply back */
241 int diff = atoi(militime_float(parv[3]));
242 sendcmdto_one(&me, CMD_PONG, sptr, "%C %s %s %i %s", &me, origin,
243 parv[3], diff, militime_float(NULL));
244 return 0;
245 }
246 if (!EmptyString(destination) && 0 != ircd_strcmp(destination, cli_name(&me))) {
247 if ((acptr = FindServer(destination))) {
248 /*
249 * Servers can just forward the origin
250 */
251 sendcmdto_one(sptr, CMD_PING, acptr, "%s :%s", origin, destination);
252 }
253 else {
254 /*
255 * this can happen if server split before the ping got here
256 */
257 send_reply(sptr, ERR_NOSUCHSERVER, destination);
258 }
259 }
260 else {
261 /*
262 * send pong back
263 * NOTE: sptr is never local so if pong handles numerics everywhere we
264 * could send a numeric here.
265 */
266 sendcmdto_one(&me, CMD_PONG, sptr, "%s :%C", origin, sptr);
267 }
268 return 0;
269 }
270