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189935b1 | 1 | /* |
2 | * IRC - Internet Relay Chat, ircd/m_create.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 | * | |
9f8856e9 | 23 | * $Id: m_create.c,v 1.18.2.3 2006/03/18 15:52:58 entrope Exp $ |
189935b1 | 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 "channel.h" | |
85 | #include "client.h" | |
86 | #include "hash.h" | |
87 | #include "ircd.h" | |
88 | #include "ircd_log.h" | |
89 | #include "ircd_reply.h" | |
90 | #include "ircd_string.h" | |
91 | #include "msg.h" | |
92 | #include "numeric.h" | |
93 | #include "numnicks.h" | |
94 | #include "s_debug.h" | |
95 | #include "s_misc.h" | |
96 | #include "s_user.h" | |
97 | #include "send.h" | |
98 | ||
99 | /* #include <assert.h> -- Now using assert in ircd_log.h */ | |
100 | #include <stdlib.h> | |
101 | #include <string.h> | |
102 | ||
103 | /* | |
104 | * ms_create - server message handler | |
105 | */ | |
106 | int ms_create(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) | |
107 | { | |
108 | time_t chanTS; /* channel creation time */ | |
109 | char *p; /* strtok state */ | |
110 | char *name; /* channel name */ | |
111 | struct Channel *chptr; /* channel */ | |
112 | struct JoinBuf join; /* join and create buffers */ | |
113 | struct JoinBuf create; | |
114 | struct ModeBuf mbuf; /* a mode buffer */ | |
115 | int badop; /* a flag */ | |
116 | ||
117 | if (IsServer(sptr)) | |
118 | return protocol_violation(sptr,"%s tried to CREATE a channel", cli_name(sptr)); | |
119 | ||
120 | /* sanity checks: Only accept CREATE messages from servers */ | |
121 | if (parc < 3 || *parv[2] == '\0') | |
122 | return need_more_params(sptr,"CREATE"); | |
123 | ||
124 | chanTS = atoi(parv[2]); | |
125 | ||
126 | /* A create that didn't appear during a burst has that servers idea of | |
127 | * the current time. Use it for lag calculations. | |
128 | */ | |
052b069e | 129 | if (!IsBurstOrBurstAck(sptr) && 0 != chanTS) |
189935b1 | 130 | cli_serv(cli_user(sptr)->server)->lag = TStime() - chanTS; |
131 | ||
132 | /* If this server is >1 minute fast, warn */ | |
133 | if (TStime() - chanTS<-60) | |
134 | { | |
135 | static time_t rate; | |
136 | sendto_opmask_butone_ratelimited(0, SNO_NETWORK, &rate, | |
137 | "Timestamp drift from %C (%is); issuing " | |
138 | "SETTIME to correct this", | |
139 | cli_user(sptr)->server, | |
140 | chanTS - TStime()); | |
141 | /* Now issue a SETTIME to resync. If we're in the wrong, our | |
142 | * (RELIABLE_CLOCK) hub will bounce a SETTIME back to us. | |
143 | */ | |
144 | sendcmdto_prio_one(&me, CMD_SETTIME, cli_user(sptr)->server, | |
145 | "%Tu %C", TStime(), cli_user(sptr)->server); | |
146 | } | |
147 | ||
148 | joinbuf_init(&join, sptr, cptr, JOINBUF_TYPE_JOIN, 0, 0); | |
149 | joinbuf_init(&create, sptr, cptr, JOINBUF_TYPE_CREATE, 0, chanTS); | |
150 | ||
151 | /* For each channel in the comma separated list: */ | |
152 | for (name = ircd_strtok(&p, parv[1], ","); name; | |
153 | name = ircd_strtok(&p, 0, ",")) { | |
154 | badop = 0; | |
155 | ||
156 | if (IsLocalChannel(name)) | |
157 | continue; | |
158 | ||
159 | if ((chptr = FindChannel(name))) | |
160 | { | |
161 | /* Is the remote server confused? */ | |
162 | if (find_member_link(chptr, sptr)) { | |
163 | protocol_violation(sptr, "%s tried to CREATE a channel already joined", cli_name(sptr)); | |
164 | continue; | |
165 | } | |
166 | ||
167 | /* Check if we need to bounce a mode */ | |
168 | if (TStime() - chanTS > TS_LAG_TIME || | |
169 | (chptr->creationtime && chanTS > chptr->creationtime && | |
052b069e | 170 | /* Accept CREATE for zannels. This is only really necessary on a network |
171 | with servers prior to 2.10.12.02: we just accept their TS and ignore | |
172 | the fact that it was a zannel. The influence of this on a network | |
173 | that is completely 2.10.12.03 or higher is neglectable: Normally | |
174 | a server only sends a CREATE after first sending a DESTRUCT. Thus, | |
9f8856e9 | 175 | by receiving a CREATE for a zannel one of three things happened: |
052b069e | 176 | 1. The DESTRUCT was sent during a net.break; this could mean that |
177 | our zannel is at the verge of expiring too, it should have been | |
178 | destructed. It is correct to copy the newer TS now, all modes | |
179 | already have been reset, so it will be as if it was destructed | |
180 | and immediately recreated. In order to avoid desyncs of modes, | |
181 | we don't accept a CREATE for channels that have +A set. | |
182 | 2. The DESTRUCT passed, then someone created the channel on our | |
183 | side and left it again. In this situation we have a near | |
184 | simultaneous creation on two servers; the person on our side | |
185 | already left within the time span of a message propagation. | |
186 | The channel will therefore be less than 48 hours old and no | |
187 | 'protection' is necessary. | |
9f8856e9 | 188 | 3. The source server sent the CREATE while linking, |
189 | before it got the BURST for our zannel. If this | |
190 | happens, we should reset the channel back to the old | |
191 | timestamp. This can be distinguished from case #1 by | |
192 | checking IsBurstOrBurstAck(cli_user(sptr)->server). | |
052b069e | 193 | */ |
194 | !(chptr->users == 0 && !chptr->mode.apass[0]))) { | |
9f8856e9 | 195 | if (!IsBurstOrBurstAck(cli_user(sptr)->server)) { |
196 | modebuf_init(&mbuf, sptr, cptr, chptr, | |
197 | (MODEBUF_DEST_SERVER | /* Send mode to server */ | |
198 | MODEBUF_DEST_HACK2 | /* Send a HACK(2) message */ | |
199 | MODEBUF_DEST_BOUNCE)); /* And bounce the mode */ | |
200 | ||
201 | modebuf_mode_client(&mbuf, MODE_ADD | MODE_CHANOP, sptr, MAXOPLEVEL + 1); | |
202 | ||
203 | modebuf_flush(&mbuf); | |
204 | ||
205 | badop = 1; | |
206 | } else if (chanTS > chptr->creationtime + 4) { | |
207 | /* If their handling of the BURST will lead to deopping the | |
208 | * user, have the user join without getting ops (if the | |
209 | * server's handling of the BURST keeps their ops, the channel | |
210 | * will use our timestamp). | |
211 | */ | |
212 | badop = 1; | |
213 | } | |
214 | ||
215 | if (badop) | |
216 | joinbuf_join(&join, chptr, 0); | |
189935b1 | 217 | } |
218 | } | |
219 | else /* Channel doesn't exist: create it */ | |
220 | chptr = get_channel(sptr, name, CGT_CREATE); | |
221 | ||
9f8856e9 | 222 | if (!badop) { |
223 | /* Set (or correct) our copy of the TS */ | |
189935b1 | 224 | chptr->creationtime = chanTS; |
9f8856e9 | 225 | joinbuf_join(&create, chptr, CHFL_CHANOP); |
226 | } | |
189935b1 | 227 | } |
228 | ||
229 | joinbuf_flush(&join); /* flush out the joins and creates */ | |
230 | joinbuf_flush(&create); | |
231 | ||
232 | return 0; | |
233 | } |