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189935b1 | 1 | /* |
2 | * IRC - Internet Relay Chat, ircd/m_kill.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_kill.c,v 1.31 2005/08/21 13:46:07 entrope Exp $ | |
24 | */ | |
25 | ||
26 | /* | |
27 | * m_functions execute protocol messages on this server: | |
28 | * | |
29 | * cptr is always NON-NULL, pointing to a *LOCAL* client | |
30 | * structure (with an open socket connected!). This | |
31 | * identifies the physical socket where the message | |
32 | * originated (or which caused the m_function to be | |
33 | * executed--some m_functions may call others...). | |
34 | * | |
35 | * sptr is the source of the message, defined by the | |
36 | * prefix part of the message if present. If not | |
37 | * or prefix not found, then sptr==cptr. | |
38 | * | |
39 | * (!IsServer(cptr)) => (cptr == sptr), because | |
40 | * prefixes are taken *only* from servers... | |
41 | * | |
42 | * (IsServer(cptr)) | |
43 | * (sptr == cptr) => the message didn't | |
44 | * have the prefix. | |
45 | * | |
46 | * (sptr != cptr && IsServer(sptr) means | |
47 | * the prefix specified servername. (?) | |
48 | * | |
49 | * (sptr != cptr && !IsServer(sptr) means | |
50 | * that message originated from a remote | |
51 | * user (not local). | |
52 | * | |
53 | * combining | |
54 | * | |
55 | * (!IsServer(sptr)) means that, sptr can safely | |
56 | * taken as defining the target structure of the | |
57 | * message in this server. | |
58 | * | |
59 | * *Always* true (if 'parse' and others are working correct): | |
60 | * | |
61 | * 1) sptr->from == cptr (note: cptr->from == cptr) | |
62 | * | |
63 | * 2) MyConnect(sptr) <=> sptr == cptr (e.g. sptr | |
64 | * *cannot* be a local connection, unless it's | |
65 | * actually cptr!). [MyConnect(x) should probably | |
66 | * be defined as (x == x->from) --msa ] | |
67 | * | |
68 | * parc number of variable parameter strings (if zero, | |
69 | * parv is allowed to be NULL) | |
70 | * | |
71 | * parv a NULL terminated list of parameter pointers, | |
72 | * | |
73 | * parv[0], sender (prefix string), if not present | |
74 | * this points to an empty string. | |
75 | * parv[1]...parv[parc-1] | |
76 | * pointers to additional parameters | |
77 | * parv[parc] == NULL, *always* | |
78 | * | |
79 | * note: it is guaranteed that parv[0]..parv[parc-1] are all | |
80 | * non-NULL pointers. | |
81 | */ | |
82 | #include "config.h" | |
83 | ||
84 | #include "client.h" | |
85 | #include "hash.h" | |
86 | #include "ircd.h" | |
87 | #include "ircd_features.h" | |
88 | #include "ircd_log.h" | |
89 | #include "ircd_reply.h" | |
90 | #include "ircd_snprintf.h" | |
91 | #include "ircd_string.h" | |
92 | #include "msg.h" | |
93 | #include "numeric.h" | |
94 | #include "numnicks.h" | |
95 | #include "s_misc.h" | |
96 | #include "send.h" | |
97 | #include "whowas.h" | |
98 | ||
99 | /* #include <assert.h> -- Now using assert in ircd_log.h */ | |
100 | #include <string.h> | |
101 | ||
102 | /* | |
103 | * do_kill - Performs the generic work involved in killing a client | |
104 | * | |
105 | */ | |
106 | static int do_kill(struct Client* cptr, struct Client* sptr, | |
107 | struct Client* victim, char* inpath, char* path, char* msg) | |
108 | { | |
109 | assert(0 != cptr); | |
110 | assert(0 != sptr); | |
111 | assert(!IsServer(victim)); | |
112 | ||
113 | /* | |
114 | * Notify all *local* opers about the KILL (this includes the one | |
115 | * originating the kill, if from this server--the special numeric | |
116 | * reply message is not generated anymore). | |
117 | * | |
118 | * Note: "victim->name" is used instead of "user" because we may | |
119 | * have changed the target because of the nickname change. | |
120 | */ | |
121 | sendto_opmask_butone(0, IsServer(sptr) ? SNO_SERVKILL : SNO_OPERKILL, | |
122 | "Received KILL message for %s. From %s Path: %s!%s %s", | |
123 | get_client_name(victim, SHOW_IP), cli_name(sptr), | |
124 | inpath, path, msg); | |
125 | log_write_kill(victim, sptr, inpath, path, msg); | |
126 | ||
127 | /* | |
128 | * And pass on the message to other servers. Note, that if KILL | |
129 | * was changed, the message has to be sent to all links, also | |
130 | * back. | |
131 | * Client suicide kills are NOT passed on --SRB | |
132 | */ | |
133 | if (IsServer(cptr) || !MyConnect(victim)) { | |
134 | sendcmdto_serv_butone(sptr, CMD_KILL, cptr, "%C :%s!%s %s", victim, | |
135 | inpath, path, msg); | |
136 | ||
137 | /* | |
138 | * Set FLAG_KILLED. This prevents exit_one_client from sending | |
139 | * the unnecessary QUIT for this. (This flag should never be | |
140 | * set in any other place) | |
141 | */ | |
142 | SetFlag(victim, FLAG_KILLED); | |
143 | } | |
144 | ||
145 | /* | |
146 | * Tell the victim she/he has been zapped, but *only* if | |
147 | * the victim is on current server--no sense in sending the | |
148 | * notification chasing the above kill, it won't get far | |
149 | * anyway (as this user don't exist there any more either) | |
150 | * In accordance with the new hiding rules, the victim | |
151 | * always sees the kill as coming from me. | |
152 | */ | |
153 | if (MyConnect(victim)) | |
154 | sendcmdto_one(feature_bool(FEAT_HIS_KILLWHO) ? &his : sptr, CMD_KILL, | |
155 | victim, "%C :%s %s", victim, feature_bool(FEAT_HIS_KILLWHO) | |
156 | ? feature_str(FEAT_HIS_SERVERNAME) : cli_name(sptr), msg); | |
157 | return exit_client_msg(cptr, victim, feature_bool(FEAT_HIS_KILLWHO) | |
158 | ? &me : sptr, "Killed (%s %s)", | |
159 | feature_bool(FEAT_HIS_KILLWHO) ? | |
160 | feature_str(FEAT_HIS_SERVERNAME) : cli_name(sptr), | |
161 | msg); | |
162 | } | |
163 | ||
164 | /* | |
165 | * ms_kill - server message handler | |
166 | * | |
167 | * NOTE: IsServer(cptr) == true; | |
168 | * | |
169 | * parv[0] = sender prefix | |
170 | * parv[1] = kill victim | |
171 | * parv[parc-1] = kill path | |
172 | */ | |
173 | int ms_kill(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) | |
174 | { | |
175 | struct Client* victim; | |
176 | char* path; | |
177 | char* msg; | |
178 | ||
179 | assert(0 != cptr); | |
180 | assert(0 != sptr); | |
181 | assert(IsServer(cptr)); | |
182 | ||
183 | /* | |
184 | * XXX - a server sending less than 3 params could really desync | |
185 | * things | |
186 | */ | |
187 | if (parc < 3) { | |
188 | protocol_violation(sptr,"Too few arguments for KILL"); | |
189 | return need_more_params(sptr, "KILL"); | |
190 | } | |
191 | ||
192 | path = parv[parc - 1]; /* Either defined or NULL (parc >= 3) */ | |
193 | ||
194 | if (!(msg = strchr(path, ' '))) /* Extract out the message */ | |
195 | msg = "(No reason supplied)"; | |
196 | else | |
197 | *(msg++) = '\0'; /* Remove first character (space) and terminate path */ | |
198 | ||
199 | if (!(victim = findNUser(parv[1]))) { | |
200 | if (IsUser(sptr)) | |
201 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :KILL target disconnected " | |
202 | "before I got him :(", sptr); | |
203 | return 0; | |
204 | } | |
205 | ||
206 | /* | |
207 | * We *can* have crossed a NICK with this numeric... --Run | |
208 | * | |
209 | * Note the following situation: | |
210 | * KILL SAA --> X | |
211 | * <-- S NICK ... SAA | <-- SAA QUIT <-- S NICK ... SAA <-- SQUIT S | |
212 | * Where the KILL reaches point X before the QUIT does. | |
213 | * This would then *still* cause an orphan because the KILL doesn't reach S | |
214 | * (because of the SQUIT), the QUIT is ignored (because of the KILL) | |
215 | * and the second NICK ... SAA causes an orphan on the server at the | |
216 | * right (which then isn't removed when the SQUIT arrives). | |
217 | * Therefore we still need to detect numeric nick collisions too. | |
218 | * | |
219 | * Bounce the kill back to the originator, if the client can't be found | |
220 | * by the next hop (short lag) the bounce won't propagate further. | |
221 | */ | |
222 | if (MyConnect(victim)) { | |
223 | sendcmdto_one(&me, CMD_KILL, cptr, "%C :%s (Ghost 5 Numeric Collided)", | |
224 | victim, path); | |
225 | } | |
226 | return do_kill(cptr, sptr, victim, cli_name(cptr), path, msg); | |
227 | } | |
228 | ||
229 | /* | |
230 | * mo_kill - oper message handler | |
231 | * | |
232 | * NOTE: IsPrivileged(sptr), IsAnOper(sptr) == true | |
233 | * IsServer(cptr), IsServer(sptr) == false | |
234 | * | |
235 | * parv[0] = sender prefix | |
236 | * parv[1] = kill victim | |
237 | * parv[parc-1] = kill path | |
238 | */ | |
239 | int mo_kill(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) | |
240 | { | |
241 | struct Client* victim; | |
242 | char* user; | |
243 | char msg[TOPICLEN + 3]; /* (, ), and \0 */ | |
244 | ||
245 | assert(0 != cptr); | |
246 | assert(0 != sptr); | |
247 | /* | |
248 | * oper connection to this server, cptr is always sptr | |
249 | */ | |
250 | assert(cptr == sptr); | |
251 | assert(IsAnOper(sptr)); | |
252 | ||
253 | if (parc < 3 || EmptyString(parv[parc - 1])) | |
254 | return need_more_params(sptr, "KILL"); | |
255 | ||
256 | user = parv[1]; | |
257 | ircd_snprintf(0, msg, sizeof(msg), "(%.*s)", TOPICLEN, parv[parc - 1]); | |
258 | ||
259 | if (!(victim = FindClient(user))) { | |
260 | /* | |
261 | * If the user has recently changed nick, we automatically | |
262 | * rewrite the KILL for this new nickname--this keeps | |
263 | * servers in synch when nick change and kill collide | |
264 | */ | |
265 | if (!(victim = get_history(user, (long)15))) | |
266 | return send_reply(sptr, ERR_NOSUCHNICK, user); | |
267 | ||
268 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Changed KILL %s into %s", sptr, | |
269 | user, cli_name(victim)); | |
270 | } | |
271 | if (!HasPriv(sptr, MyConnect(victim) ? PRIV_LOCAL_KILL : PRIV_KILL)) | |
272 | return send_reply(sptr, ERR_NOPRIVILEGES); | |
273 | ||
274 | if (IsServer(victim) || IsMe(victim)) { | |
275 | return send_reply(sptr, ERR_CANTKILLSERVER); | |
276 | } | |
277 | /* | |
278 | * if the user is +k, prevent a kill from local user | |
279 | */ | |
d8e74551 | 280 | /* |
281 | * ASUKA_X: | |
282 | * Allow +X'ed users to kill +k'ed, but not U-lined services. | |
283 | * --Bigfoot | |
284 | */ | |
285 | if (IsChannelService(victim) && IsService(cli_user(victim)->server)) | |
286 | return send_reply(sptr, ERR_ISREALSERVICE, "KILL", cli_name(victim)); | |
287 | ||
288 | if (IsChannelService(victim) && !IsXtraOp(sptr) && !(victim==sptr)) | |
189935b1 | 289 | return send_reply(sptr, ERR_ISCHANSERVICE, "KILL", cli_name(victim)); |
290 | ||
291 | ||
292 | if (!MyConnect(victim) && !HasPriv(sptr, PRIV_KILL)) { | |
293 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Nick %s isn't on your server", | |
294 | sptr, cli_name(victim)); | |
295 | return 0; | |
296 | } | |
297 | return do_kill(cptr, sptr, victim, cli_user(sptr)->host, cli_name(sptr), | |
298 | msg); | |
299 | } |