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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 | ||
ace0c865 | 83 | #define IsSetStrictCallerID(c) ((c->umodes & user_modes['g']) == user_modes['g']) |
7b60cca0 | 84 | #define IsSetRelaxedCallerID(c) ((c->umodes & user_modes['G']) == user_modes['G']) |
ace0c865 | 85 | #define IsSetAnyCallerID(c) (IsSetStrictCallerID(c) || IsSetRelaxedCallerID(c)) |
921b508b AC |
86 | |
87 | static const char um_callerid_desc[] = | |
4d07382c | 88 | "Provides usermodes +g and +G which restrict messages from unauthorized users."; |
921b508b | 89 | |
7b60cca0 AC |
90 | static bool |
91 | has_common_channel(struct Client *source_p, struct Client *target_p) | |
92 | { | |
93 | rb_dlink_node *ptr; | |
94 | ||
95 | RB_DLINK_FOREACH(ptr, source_p->user->channel.head) | |
96 | { | |
97 | struct membership *msptr = ptr->data; | |
98 | if (IsMember(target_p, msptr->chptr)) | |
5d4cce6c | 99 | return true; |
7b60cca0 AC |
100 | } |
101 | ||
5d4cce6c | 102 | return false; |
7b60cca0 AC |
103 | } |
104 | ||
921b508b AC |
105 | static bool |
106 | allow_message(struct Client *source_p, struct Client *target_p) | |
107 | { | |
108 | if (!MyClient(target_p)) | |
109 | return true; | |
110 | ||
ace0c865 | 111 | if (!IsSetAnyCallerID(target_p)) |
921b508b AC |
112 | return true; |
113 | ||
ace0c865 | 114 | if (IsSetRelaxedCallerID(target_p) && has_common_channel(source_p, target_p) && !IsSetStrictCallerID(target_p)) |
7b60cca0 AC |
115 | return true; |
116 | ||
921b508b AC |
117 | if (IsServer(source_p)) |
118 | return true; | |
119 | ||
120 | /* XXX: controversial? allow opers to send through +g */ | |
121 | if (IsOper(source_p)) | |
122 | return true; | |
123 | ||
124 | if (accept_message(source_p, target_p)) | |
125 | return true; | |
126 | ||
127 | return false; | |
128 | } | |
129 | ||
130 | static void | |
131 | send_callerid_notice(enum message_type msgtype, struct Client *source_p, struct Client *target_p) | |
132 | { | |
133 | if (!MyClient(target_p)) | |
134 | return; | |
135 | ||
136 | if (msgtype == MESSAGE_TYPE_NOTICE) | |
137 | return; | |
138 | ||
139 | sendto_one_numeric(source_p, ERR_TARGUMODEG, form_str(ERR_TARGUMODEG), | |
ace0c865 | 140 | target_p->name, IsSetStrictCallerID(target_p) ? "+g" : "+G"); |
921b508b AC |
141 | |
142 | if ((target_p->localClient->last_caller_id_time + ConfigFileEntry.caller_id_wait) < rb_current_time()) | |
143 | { | |
144 | sendto_one_numeric(source_p, RPL_TARGNOTIFY, form_str(RPL_TARGNOTIFY), | |
145 | target_p->name); | |
146 | ||
147 | sendto_one(target_p, form_str(RPL_UMODEGMSG), | |
148 | me.name, target_p->name, source_p->name, | |
ace0c865 | 149 | source_p->username, source_p->host, IsSetStrictCallerID(target_p) ? "+g" : "+G"); |
921b508b AC |
150 | |
151 | target_p->localClient->last_caller_id_time = rb_current_time(); | |
152 | } | |
153 | } | |
154 | ||
155 | static bool | |
156 | add_callerid_accept_for_source(enum message_type msgtype, struct Client *source_p, struct Client *target_p) | |
157 | { | |
4abf8eb2 AC |
158 | /* only do this on source_p's server */ |
159 | if (!MyClient(source_p)) | |
4841ad61 AC |
160 | return true; |
161 | ||
921b508b AC |
162 | /* |
163 | * XXX: Controversial? Allow target users to send replies | |
164 | * through a +g. Rationale is that people can presently use +g | |
165 | * as a way to taunt users, e.g. harass them and hide behind +g | |
166 | * as a way of griefing. --nenolod | |
167 | */ | |
168 | if(msgtype != MESSAGE_TYPE_NOTICE && | |
ace0c865 | 169 | IsSetAnyCallerID(source_p) && |
4841ad61 AC |
170 | !accept_message(target_p, source_p) && |
171 | !IsOper(target_p)) | |
921b508b AC |
172 | { |
173 | if(rb_dlink_list_length(&source_p->localClient->allow_list) < | |
174 | (unsigned long)ConfigFileEntry.max_accept) | |
175 | { | |
176 | rb_dlinkAddAlloc(target_p, &source_p->localClient->allow_list); | |
177 | rb_dlinkAddAlloc(source_p, &target_p->on_allow_list); | |
178 | } | |
179 | else | |
180 | { | |
181 | sendto_one_numeric(source_p, ERR_OWNMODE, | |
182 | form_str(ERR_OWNMODE), | |
183 | target_p->name, "+g"); | |
184 | return false; | |
185 | } | |
186 | } | |
187 | ||
188 | return true; | |
189 | } | |
190 | ||
191 | static void | |
db807634 | 192 | h_hdl_invite(void *vdata) |
921b508b AC |
193 | { |
194 | hook_data_channel_approval *data = vdata; | |
195 | struct Client *source_p = data->client; | |
196 | struct Client *target_p = data->target; | |
c6edf654 | 197 | static char errorbuf[BUFSIZE]; |
921b508b | 198 | |
6558648d AC |
199 | if (data->approved) |
200 | return; | |
201 | ||
921b508b AC |
202 | if (!add_callerid_accept_for_source(MESSAGE_TYPE_PRIVMSG, source_p, target_p)) |
203 | { | |
204 | data->approved = ERR_TARGUMODEG; | |
205 | return; | |
206 | } | |
207 | ||
208 | if (allow_message(source_p, target_p)) | |
209 | return; | |
210 | ||
c6edf654 | 211 | snprintf(errorbuf, sizeof errorbuf, form_str(ERR_TARGUMODEG), |
c6e584dd | 212 | target_p->name, IsSetStrictCallerID(target_p) ? "+g" : "+G"); |
921b508b AC |
213 | |
214 | data->approved = ERR_TARGUMODEG; | |
c6edf654 | 215 | data->error = errorbuf; |
921b508b AC |
216 | } |
217 | ||
218 | static void | |
219 | h_hdl_privmsg_user(void *vdata) | |
220 | { | |
221 | hook_data_privmsg_user *data = vdata; | |
222 | enum message_type msgtype = data->msgtype; | |
223 | struct Client *source_p = data->source_p; | |
224 | struct Client *target_p = data->target_p; | |
225 | ||
6558648d AC |
226 | if (data->approved) |
227 | return; | |
228 | ||
921b508b AC |
229 | if (!add_callerid_accept_for_source(msgtype, source_p, target_p)) |
230 | { | |
231 | data->approved = ERR_TARGUMODEG; | |
232 | return; | |
233 | } | |
234 | ||
235 | if (allow_message(source_p, target_p)) | |
236 | return; | |
237 | ||
238 | send_callerid_notice(msgtype, source_p, target_p); | |
239 | ||
240 | data->approved = ERR_TARGUMODEG; | |
241 | } | |
242 | ||
243 | static mapi_hfn_list_av1 um_callerid_hfnlist[] = { | |
db807634 | 244 | { "invite", h_hdl_invite }, |
921b508b AC |
245 | { "privmsg_user", h_hdl_privmsg_user }, |
246 | { NULL, NULL } | |
247 | }; | |
248 | ||
249 | DECLARE_MODULE_AV2(um_callerid, um_callerid_modinit, um_callerid_moddeinit, | |
250 | NULL, NULL, um_callerid_hfnlist, NULL, NULL, um_callerid_desc); |