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1 | /* | |
2 | * ircd-ratbox: A slightly useful ircd. | |
3 | * m_knock.c: Requests to be invited to a channel. | |
4 | * | |
5 | * Copyright (C) 1996-2002 Hybrid Development Team | |
6 | * Copyright (C) 2002-2005 ircd-ratbox development team | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
21 | * USA | |
22 | */ | |
23 | ||
24 | #include "stdinc.h" | |
25 | #include "channel.h" | |
26 | #include "client.h" | |
27 | #include "hash.h" | |
28 | #include "match.h" | |
29 | #include "ircd.h" | |
30 | #include "numeric.h" | |
31 | #include "send.h" | |
32 | #include "s_conf.h" | |
33 | #include "msg.h" | |
34 | #include "parse.h" | |
35 | #include "modules.h" | |
36 | #include "s_serv.h" | |
37 | #include "supported.h" | |
38 | ||
39 | static const char knock_desc[] = "Provides the KNOCK command to ask for an invite to an invite-only channel"; | |
40 | ||
41 | static void m_knock(struct MsgBuf *, struct Client *, struct Client *, int, const char **); | |
42 | ||
43 | struct Message knock_msgtab = { | |
44 | "KNOCK", 0, 0, 0, 0, | |
45 | {mg_unreg, {m_knock, 2}, {m_knock, 2}, mg_ignore, mg_ignore, {m_knock, 2}} | |
46 | }; | |
47 | ||
48 | static int | |
49 | _modinit(void) | |
50 | { | |
51 | add_isupport("KNOCK", isupport_boolean, &ConfigChannel.use_knock); | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static void | |
56 | _moddeinit(void) | |
57 | { | |
58 | delete_isupport("KNOCK"); | |
59 | } | |
60 | ||
61 | mapi_clist_av1 knock_clist[] = { &knock_msgtab, NULL }; | |
62 | ||
63 | DECLARE_MODULE_AV2(knock, _modinit, _moddeinit, knock_clist, NULL, NULL, NULL, NULL, knock_desc); | |
64 | ||
65 | /* m_knock | |
66 | * parv[1] = channel | |
67 | * | |
68 | * The KNOCK command has the following syntax: | |
69 | * :<sender> KNOCK <channel> | |
70 | * | |
71 | * If a user is not banned from the channel they can use the KNOCK | |
72 | * command to have the server NOTICE the channel operators notifying | |
73 | * they would like to join. Helpful if the channel is invite-only, the | |
74 | * key is forgotten, or the channel is full (INVITE can bypass each one | |
75 | * of these conditions. Concept by Dianora <db@db.net> and written by | |
76 | * <anonymous> | |
77 | */ | |
78 | static void | |
79 | m_knock(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[]) | |
80 | { | |
81 | struct Channel *chptr; | |
82 | char *p, *name; | |
83 | ||
84 | if(MyClient(source_p) && ConfigChannel.use_knock == 0) | |
85 | { | |
86 | sendto_one(source_p, form_str(ERR_KNOCKDISABLED), | |
87 | me.name, source_p->name); | |
88 | return; | |
89 | } | |
90 | ||
91 | name = LOCAL_COPY(parv[1]); | |
92 | ||
93 | /* dont allow one knock to multiple chans */ | |
94 | if((p = strchr(name, ','))) | |
95 | *p = '\0'; | |
96 | ||
97 | if((chptr = find_channel(name)) == NULL) | |
98 | { | |
99 | sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL, | |
100 | form_str(ERR_NOSUCHCHANNEL), name); | |
101 | return; | |
102 | } | |
103 | ||
104 | if(IsMember(source_p, chptr)) | |
105 | { | |
106 | if(MyClient(source_p)) | |
107 | sendto_one(source_p, form_str(ERR_KNOCKONCHAN), | |
108 | me.name, source_p->name, name); | |
109 | return; | |
110 | } | |
111 | ||
112 | if(!((chptr->mode.mode & MODE_INVITEONLY) || (*chptr->mode.key) || | |
113 | (chptr->mode.limit && | |
114 | rb_dlink_list_length(&chptr->members) >= (unsigned long)chptr->mode.limit))) | |
115 | { | |
116 | sendto_one_numeric(source_p, ERR_CHANOPEN, | |
117 | form_str(ERR_CHANOPEN), name); | |
118 | return; | |
119 | } | |
120 | ||
121 | /* cant knock to a +p channel */ | |
122 | if(HiddenChannel(chptr)) | |
123 | { | |
124 | sendto_one_numeric(source_p, ERR_CANNOTSENDTOCHAN, | |
125 | form_str(ERR_CANNOTSENDTOCHAN), name); | |
126 | return; | |
127 | } | |
128 | ||
129 | ||
130 | if(MyClient(source_p)) | |
131 | { | |
132 | /* don't allow a knock if the user is banned */ | |
133 | if(is_banned(chptr, source_p, NULL, NULL, NULL, NULL) == CHFL_BAN || | |
134 | is_quieted(chptr, source_p, NULL, NULL, NULL) == CHFL_BAN) | |
135 | { | |
136 | sendto_one_numeric(source_p, ERR_CANNOTSENDTOCHAN, | |
137 | form_str(ERR_CANNOTSENDTOCHAN), name); | |
138 | return; | |
139 | } | |
140 | ||
141 | /* local flood protection: | |
142 | * allow one knock per user per knock_delay | |
143 | * allow one knock per channel per knock_delay_channel | |
144 | */ | |
145 | if(!IsOper(source_p) && | |
146 | (source_p->localClient->last_knock + ConfigChannel.knock_delay) > rb_current_time()) | |
147 | { | |
148 | sendto_one(source_p, form_str(ERR_TOOMANYKNOCK), | |
149 | me.name, source_p->name, name, "user"); | |
150 | return; | |
151 | } | |
152 | else if((chptr->last_knock + ConfigChannel.knock_delay_channel) > rb_current_time()) | |
153 | { | |
154 | sendto_one(source_p, form_str(ERR_TOOMANYKNOCK), | |
155 | me.name, source_p->name, name, "channel"); | |
156 | return; | |
157 | } | |
158 | ||
159 | /* ok, we actually can send the knock, tell client */ | |
160 | source_p->localClient->last_knock = rb_current_time(); | |
161 | ||
162 | sendto_one(source_p, form_str(RPL_KNOCKDLVR), | |
163 | me.name, source_p->name, name); | |
164 | } | |
165 | ||
166 | chptr->last_knock = rb_current_time(); | |
167 | ||
168 | if(ConfigChannel.use_knock) | |
169 | sendto_channel_local(chptr->mode.mode & MODE_FREEINVITE ? ALL_MEMBERS : ONLY_CHANOPS, | |
170 | chptr, form_str(RPL_KNOCK), | |
171 | me.name, name, name, source_p->name, | |
172 | source_p->username, source_p->host); | |
173 | ||
174 | sendto_server(client_p, chptr, CAP_KNOCK|CAP_TS6, NOCAPS, | |
175 | ":%s KNOCK %s", use_id(source_p), name); | |
176 | sendto_server(client_p, chptr, CAP_KNOCK, CAP_TS6, | |
177 | ":%s KNOCK %s", source_p->name, name); | |
178 | } | |
179 |