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921b508b AC |
1 | /* |
2 | * modules/um_callerid.c | |
3 | * Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org> | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions are | |
7 | * met: | |
8 | * | |
9 | * 1. Redistributions of source code must retain the above copyright notice, | |
10 | * this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * 3. The name of the author may not be used to endorse or promote products | |
15 | * derived from this software without specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
19 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
20 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | |
21 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
22 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
23 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
25 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
26 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
27 | * POSSIBILITY OF SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | #include "stdinc.h" | |
31 | #include "modules.h" | |
32 | #include "hook.h" | |
33 | #include "client.h" | |
34 | #include "ircd.h" | |
35 | #include "send.h" | |
36 | #include "hash.h" | |
37 | #include "s_conf.h" | |
38 | #include "s_user.h" | |
39 | #include "s_serv.h" | |
40 | #include "numeric.h" | |
41 | #include "privilege.h" | |
42 | #include "s_newconf.h" | |
43 | #include "hook.h" | |
44 | #include "supported.h" | |
fdff78f8 | 45 | #include "logger.h" |
921b508b AC |
46 | |
47 | static int | |
48 | um_callerid_modinit(void) | |
49 | { | |
50 | user_modes['g'] = find_umode_slot(); | |
fdff78f8 AC |
51 | if (!user_modes['g']) |
52 | { | |
53 | ierror("um_callerid: unable to allocate usermode slot for +g; unloading module."); | |
54 | return -1; | |
55 | } | |
56 | ||
7b60cca0 | 57 | user_modes['G'] = find_umode_slot(); |
fdff78f8 AC |
58 | if (!user_modes['G']) |
59 | { | |
915bb561 AC |
60 | user_modes['g'] = 0; |
61 | ||
fdff78f8 AC |
62 | ierror("um_callerid: unable to allocate usermode slot for +G; unloading module."); |
63 | return -1; | |
64 | } | |
65 | ||
921b508b AC |
66 | construct_umodebuf(); |
67 | ||
3ed61fba | 68 | add_isupport("CALLERID", isupport_umode, "g"); |
921b508b AC |
69 | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static void | |
74 | um_callerid_moddeinit(void) | |
75 | { | |
76 | user_modes['g'] = 0; | |
7b60cca0 | 77 | user_modes['G'] = 0; |
921b508b AC |
78 | construct_umodebuf(); |
79 | ||
80 | delete_isupport("CALLERID"); | |
81 | } | |
82 | ||
83 | #define IsSetCallerID(c) ((c->umodes & user_modes['g']) == user_modes['g']) | |
7b60cca0 | 84 | #define IsSetRelaxedCallerID(c) ((c->umodes & user_modes['G']) == user_modes['G']) |
921b508b AC |
85 | |
86 | static const char um_callerid_desc[] = | |
4d07382c | 87 | "Provides usermodes +g and +G which restrict messages from unauthorized users."; |
921b508b | 88 | |
7b60cca0 AC |
89 | static bool |
90 | has_common_channel(struct Client *source_p, struct Client *target_p) | |
91 | { | |
92 | rb_dlink_node *ptr; | |
93 | ||
94 | RB_DLINK_FOREACH(ptr, source_p->user->channel.head) | |
95 | { | |
96 | struct membership *msptr = ptr->data; | |
97 | if (IsMember(target_p, msptr->chptr)) | |
5d4cce6c | 98 | return true; |
7b60cca0 AC |
99 | } |
100 | ||
5d4cce6c | 101 | return false; |
7b60cca0 AC |
102 | } |
103 | ||
921b508b AC |
104 | static bool |
105 | allow_message(struct Client *source_p, struct Client *target_p) | |
106 | { | |
107 | if (!MyClient(target_p)) | |
108 | return true; | |
109 | ||
110 | if (!IsSetCallerID(target_p)) | |
111 | return true; | |
112 | ||
7b60cca0 AC |
113 | if (IsSetRelaxedCallerID(target_p) && has_common_channel(source_p, target_p)) |
114 | return true; | |
115 | ||
921b508b AC |
116 | if (IsServer(source_p)) |
117 | return true; | |
118 | ||
119 | /* XXX: controversial? allow opers to send through +g */ | |
120 | if (IsOper(source_p)) | |
121 | return true; | |
122 | ||
123 | if (accept_message(source_p, target_p)) | |
124 | return true; | |
125 | ||
126 | return false; | |
127 | } | |
128 | ||
129 | static void | |
130 | send_callerid_notice(enum message_type msgtype, struct Client *source_p, struct Client *target_p) | |
131 | { | |
132 | if (!MyClient(target_p)) | |
133 | return; | |
134 | ||
135 | if (msgtype == MESSAGE_TYPE_NOTICE) | |
136 | return; | |
137 | ||
138 | sendto_one_numeric(source_p, ERR_TARGUMODEG, form_str(ERR_TARGUMODEG), | |
139 | target_p->name); | |
140 | ||
141 | if ((target_p->localClient->last_caller_id_time + ConfigFileEntry.caller_id_wait) < rb_current_time()) | |
142 | { | |
143 | sendto_one_numeric(source_p, RPL_TARGNOTIFY, form_str(RPL_TARGNOTIFY), | |
144 | target_p->name); | |
145 | ||
146 | sendto_one(target_p, form_str(RPL_UMODEGMSG), | |
147 | me.name, target_p->name, source_p->name, | |
148 | source_p->username, source_p->host); | |
149 | ||
150 | target_p->localClient->last_caller_id_time = rb_current_time(); | |
151 | } | |
152 | } | |
153 | ||
154 | static bool | |
155 | add_callerid_accept_for_source(enum message_type msgtype, struct Client *source_p, struct Client *target_p) | |
156 | { | |
4abf8eb2 AC |
157 | /* only do this on source_p's server */ |
158 | if (!MyClient(source_p)) | |
4841ad61 AC |
159 | return true; |
160 | ||
921b508b AC |
161 | /* |
162 | * XXX: Controversial? Allow target users to send replies | |
163 | * through a +g. Rationale is that people can presently use +g | |
164 | * as a way to taunt users, e.g. harass them and hide behind +g | |
165 | * as a way of griefing. --nenolod | |
166 | */ | |
167 | if(msgtype != MESSAGE_TYPE_NOTICE && | |
4841ad61 AC |
168 | IsSetCallerID(source_p) && |
169 | !accept_message(target_p, source_p) && | |
170 | !IsOper(target_p)) | |
921b508b AC |
171 | { |
172 | if(rb_dlink_list_length(&source_p->localClient->allow_list) < | |
173 | (unsigned long)ConfigFileEntry.max_accept) | |
174 | { | |
175 | rb_dlinkAddAlloc(target_p, &source_p->localClient->allow_list); | |
176 | rb_dlinkAddAlloc(source_p, &target_p->on_allow_list); | |
177 | } | |
178 | else | |
179 | { | |
180 | sendto_one_numeric(source_p, ERR_OWNMODE, | |
181 | form_str(ERR_OWNMODE), | |
182 | target_p->name, "+g"); | |
183 | return false; | |
184 | } | |
185 | } | |
186 | ||
187 | return true; | |
188 | } | |
189 | ||
190 | static void | |
db807634 | 191 | h_hdl_invite(void *vdata) |
921b508b AC |
192 | { |
193 | hook_data_channel_approval *data = vdata; | |
194 | struct Client *source_p = data->client; | |
195 | struct Client *target_p = data->target; | |
c6edf654 | 196 | static char errorbuf[BUFSIZE]; |
921b508b | 197 | |
6558648d AC |
198 | if (data->approved) |
199 | return; | |
200 | ||
921b508b AC |
201 | if (!add_callerid_accept_for_source(MESSAGE_TYPE_PRIVMSG, source_p, target_p)) |
202 | { | |
203 | data->approved = ERR_TARGUMODEG; | |
204 | return; | |
205 | } | |
206 | ||
207 | if (allow_message(source_p, target_p)) | |
208 | return; | |
209 | ||
c6edf654 AC |
210 | snprintf(errorbuf, sizeof errorbuf, form_str(ERR_TARGUMODEG), |
211 | target_p->name); | |
921b508b AC |
212 | |
213 | data->approved = ERR_TARGUMODEG; | |
c6edf654 | 214 | data->error = errorbuf; |
921b508b AC |
215 | } |
216 | ||
217 | static void | |
218 | h_hdl_privmsg_user(void *vdata) | |
219 | { | |
220 | hook_data_privmsg_user *data = vdata; | |
221 | enum message_type msgtype = data->msgtype; | |
222 | struct Client *source_p = data->source_p; | |
223 | struct Client *target_p = data->target_p; | |
224 | ||
6558648d AC |
225 | if (data->approved) |
226 | return; | |
227 | ||
921b508b AC |
228 | if (!add_callerid_accept_for_source(msgtype, source_p, target_p)) |
229 | { | |
230 | data->approved = ERR_TARGUMODEG; | |
231 | return; | |
232 | } | |
233 | ||
234 | if (allow_message(source_p, target_p)) | |
235 | return; | |
236 | ||
237 | send_callerid_notice(msgtype, source_p, target_p); | |
238 | ||
239 | data->approved = ERR_TARGUMODEG; | |
240 | } | |
241 | ||
242 | static mapi_hfn_list_av1 um_callerid_hfnlist[] = { | |
db807634 | 243 | { "invite", h_hdl_invite }, |
921b508b AC |
244 | { "privmsg_user", h_hdl_privmsg_user }, |
245 | { NULL, NULL } | |
246 | }; | |
247 | ||
248 | DECLARE_MODULE_AV2(um_callerid, um_callerid_modinit, um_callerid_moddeinit, | |
249 | NULL, NULL, um_callerid_hfnlist, NULL, NULL, um_callerid_desc); |