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189935b1 | 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: m_ping.c,v 1.12 2005/09/11 17:40:21 decampos Exp $ | |
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 | */ | |
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 | */ | |
178 | int mo_ping(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) | |
179 | { | |
180 | struct Client* acptr; | |
181 | char *destination, *origin; | |
182 | assert(0 != cptr); | |
183 | assert(cptr == sptr); | |
184 | ||
185 | if (parc < 2 || EmptyString(parv[1])) | |
186 | return send_reply(sptr, ERR_NOORIGIN); | |
187 | ||
188 | origin = parv[1]; | |
189 | destination = parv[2]; /* Will get NULL or pointer (parc >= 2!!) */ | |
190 | ||
191 | if (!EmptyString(destination) && 0 != ircd_strcmp(destination, cli_name(&me))) { | |
192 | if ((acptr = FindServer(destination))) | |
193 | sendcmdto_one(sptr, CMD_PING, acptr, "%C :%s", sptr, destination); | |
194 | else | |
195 | send_reply(sptr, ERR_NOSUCHSERVER, destination); | |
196 | } | |
197 | else { | |
198 | /* | |
199 | * NOTE: clients rely on this to return the origin string. | |
200 | * it's pointless to send more than 64 bytes back tho' | |
201 | */ | |
202 | char* origin = parv[1]; | |
203 | ||
204 | /* Is this supposed to be here? */ | |
205 | acptr = FindClient(origin); | |
206 | if (acptr && acptr != sptr) | |
207 | origin = cli_name(cptr); | |
208 | ||
209 | if (strlen(origin) > 64) | |
210 | origin[64] = '\0'; | |
211 | sendcmdto_one(&me, CMD_PONG, sptr, "%C :%s", &me, origin); | |
212 | } | |
213 | return 0; | |
214 | } | |
215 | ||
216 | /* | |
217 | * Extension notes | |
218 | * | |
219 | * <Vek> bleep: here's the change you make to PING: | |
220 | * <Vek> F TOK_PING F G 7777777777.7777777 | |
221 | * <Vek> then optional parameter for further enhancement | |
222 | * <Vek> G TOK_PONG G F 7777777777.7777777 0.1734637 | |
223 | */ | |
224 | ||
225 | /* | |
226 | * ms_ping - server message handler | |
227 | */ | |
228 | int ms_ping(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) | |
229 | { | |
230 | struct Client* acptr; | |
231 | char* origin; | |
232 | char* destination; | |
233 | ||
234 | assert(0 != cptr); | |
235 | assert(0 != sptr); | |
236 | assert(IsServer(cptr)); | |
237 | ||
238 | if (parc < 2 || EmptyString(parv[1])) { | |
239 | /* | |
240 | * don't bother sending the error back | |
241 | */ | |
242 | return 0; | |
243 | } | |
244 | origin = parv[1]; | |
245 | destination = parv[2]; /* Will get NULL or pointer (parc >= 2!!) */ | |
246 | ||
247 | if (parc > 3) | |
248 | { | |
249 | /* AsLL ping, send reply back */ | |
250 | int diff = atoi(militime_float(parv[3])); | |
251 | sendcmdto_one(&me, CMD_PONG, sptr, "%C %s %s %i %s", &me, origin, | |
252 | parv[3], diff, militime_float(NULL)); | |
253 | return 0; | |
254 | } | |
255 | if (!EmptyString(destination) && 0 != ircd_strcmp(destination, cli_name(&me))) { | |
256 | if ((acptr = FindServer(destination))) { | |
257 | /* | |
258 | * Servers can just forward the origin | |
259 | */ | |
260 | sendcmdto_one(sptr, CMD_PING, acptr, "%s :%s", origin, destination); | |
261 | } | |
262 | else { | |
263 | /* | |
264 | * this can happen if server split before the ping got here | |
265 | */ | |
266 | send_reply(sptr, ERR_NOSUCHSERVER, destination); | |
267 | } | |
268 | } | |
269 | else { | |
270 | /* | |
271 | * send pong back | |
272 | * NOTE: sptr is never local so if pong handles numerics everywhere we | |
273 | * could send a numeric here. | |
274 | */ | |
275 | sendcmdto_one(&me, CMD_PONG, sptr, "%C :%s", &me, origin); | |
276 | } | |
277 | return 0; | |
278 | } |