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212380e3 AC |
1 | /* |
2 | * Copyright (c) 2005 William Pitcock <nenolod -at- nenolod.net> | |
3 | * and Jilles Tjoelker <jilles -at- stack.nl> | |
4 | * All rights reserved. | |
5 | * | |
6 | * Redistribution in both source and binary forms are permitted | |
7 | * provided that the above copyright notice remains unchanged. | |
8 | * | |
9 | * m_chghost.c: A module for handling spoofing dynamically. | |
10 | */ | |
11 | ||
12 | #include "stdinc.h" | |
212380e3 AC |
13 | #include "send.h" |
14 | #include "channel.h" | |
15 | #include "client.h" | |
16 | #include "common.h" | |
9b8e9eb3 | 17 | #include "defaults.h" |
212380e3 AC |
18 | #include "ircd.h" |
19 | #include "numeric.h" | |
212380e3 AC |
20 | #include "s_conf.h" |
21 | #include "s_newconf.h" | |
22 | #include "s_serv.h" | |
23 | #include "s_user.h" | |
24 | #include "hash.h" | |
25 | #include "msg.h" | |
26 | #include "parse.h" | |
27 | #include "modules.h" | |
212380e3 AC |
28 | #include "whowas.h" |
29 | #include "monitor.h" | |
30 | ||
eeabf33a EM |
31 | static const char chghost_desc[] = "Provides commands used to change and retrieve client hostnames"; |
32 | ||
3c7d6fcc EM |
33 | static void me_realhost(struct MsgBuf *, struct Client *, struct Client *, int, const char **); |
34 | static void ms_chghost(struct MsgBuf *, struct Client *, struct Client *, int, const char **); | |
35 | static void me_chghost(struct MsgBuf *, struct Client *, struct Client *, int, const char **); | |
36 | static void mo_chghost(struct MsgBuf *, struct Client *, struct Client *, int, const char **); | |
212380e3 AC |
37 | |
38 | struct Message realhost_msgtab = { | |
7baa37a9 | 39 | "REALHOST", 0, 0, 0, 0, |
212380e3 AC |
40 | {mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_realhost, 2}, mg_ignore} |
41 | }; | |
42 | ||
43 | struct Message chghost_msgtab = { | |
7baa37a9 | 44 | "CHGHOST", 0, 0, 0, 0, |
212380e3 AC |
45 | {mg_ignore, mg_not_oper, {ms_chghost, 3}, {ms_chghost, 3}, {me_chghost, 3}, {mo_chghost, 3}} |
46 | }; | |
47 | ||
48 | mapi_clist_av1 chghost_clist[] = { &chghost_msgtab, &realhost_msgtab, NULL }; | |
49 | ||
5544da98 | 50 | DECLARE_MODULE_AV2(chghost, NULL, NULL, chghost_clist, NULL, NULL, NULL, NULL, chghost_desc); |
212380e3 AC |
51 | |
52 | /* clean_host() | |
53 | * | |
54 | * input - host to check | |
b8b72cbd | 55 | * output - false if erroneous, else true |
212380e3 AC |
56 | * side effects - |
57 | */ | |
b8b72cbd | 58 | static bool |
212380e3 AC |
59 | clean_host(const char *host) |
60 | { | |
61 | int len = 0; | |
9a180ae3 | 62 | const char *last_slash = 0; |
55abcbb2 | 63 | |
822a4a25 | 64 | if (*host == '\0' || *host == ':') |
b8b72cbd | 65 | return false; |
212380e3 AC |
66 | |
67 | for(; *host; host++) | |
68 | { | |
69 | len++; | |
70 | ||
71 | if(!IsHostChar(*host)) | |
b8b72cbd | 72 | return false; |
9a180ae3 SB |
73 | if(*host == '/') |
74 | last_slash = host; | |
212380e3 AC |
75 | } |
76 | ||
77 | if(len > HOSTLEN) | |
b8b72cbd | 78 | return false; |
212380e3 | 79 | |
9a180ae3 | 80 | if(last_slash && IsDigit(last_slash[1])) |
b8b72cbd | 81 | return false; |
9a180ae3 | 82 | |
b8b72cbd | 83 | return true; |
212380e3 AC |
84 | } |
85 | ||
86 | /* | |
87 | * me_realhost | |
212380e3 AC |
88 | * parv[1] = real host |
89 | * | |
90 | * Yes this contains a little race condition if someone does a whois | |
91 | * in between the UID and REALHOST and use_whois_actually is enabled. | |
92 | * I don't think that's a big problem as the whole thing is a | |
93 | * race condition. | |
94 | */ | |
3c7d6fcc | 95 | static void |
428ca87b | 96 | me_realhost(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, |
212380e3 AC |
97 | int parc, const char *parv[]) |
98 | { | |
99 | if (!IsPerson(source_p)) | |
3c7d6fcc | 100 | return; |
212380e3 AC |
101 | |
102 | del_from_hostname_hash(source_p->orighost, source_p); | |
f427c8b0 | 103 | rb_strlcpy(source_p->orighost, parv[1], sizeof source_p->orighost); |
212380e3 AC |
104 | if (irccmp(source_p->host, source_p->orighost)) |
105 | SetDynSpoof(source_p); | |
106 | else | |
107 | ClearDynSpoof(source_p); | |
108 | add_to_hostname_hash(source_p->orighost, source_p); | |
212380e3 AC |
109 | } |
110 | ||
b8b72cbd | 111 | static bool |
212380e3 AC |
112 | do_chghost(struct Client *source_p, struct Client *target_p, |
113 | const char *newhost, int is_encap) | |
114 | { | |
115 | if (!clean_host(newhost)) | |
116 | { | |
117 | sendto_realops_snomask(SNO_GENERAL, is_encap ? L_ALL : L_NETWIDE, "%s attempted to change hostname for %s to %s (invalid)", | |
118 | IsServer(source_p) ? source_p->name : get_oper_name(source_p), | |
119 | target_p->name, newhost); | |
120 | /* sending this remotely may disclose important | |
121 | * routing information -- jilles */ | |
122 | if (is_encap ? MyClient(target_p) : !ConfigServerHide.flatten_links) | |
123 | sendto_one_notice(target_p, ":*** Notice -- %s attempted to change your hostname to %s (invalid)", | |
124 | source_p->name, newhost); | |
b8b72cbd | 125 | return false; |
212380e3 AC |
126 | } |
127 | change_nick_user_host(target_p, target_p->name, target_p->username, newhost, 0, "Changing host"); | |
128 | if (irccmp(target_p->host, target_p->orighost)) | |
129 | { | |
130 | SetDynSpoof(target_p); | |
131 | if (MyClient(target_p)) | |
132 | sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :is now your hidden host (set by %s)", target_p->host, source_p->name); | |
133 | } | |
134 | else | |
135 | { | |
136 | ClearDynSpoof(target_p); | |
137 | if (MyClient(target_p)) | |
138 | sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :hostname reset by %s", target_p->host, source_p->name); | |
139 | } | |
140 | if (MyClient(source_p)) | |
141 | sendto_one_notice(source_p, ":Changed hostname for %s to %s", target_p->name, target_p->host); | |
142 | if (!IsServer(source_p) && !IsService(source_p)) | |
143 | sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s changed hostname for %s to %s", get_oper_name(source_p), target_p->name, target_p->host); | |
b8b72cbd | 144 | return true; |
212380e3 AC |
145 | } |
146 | ||
147 | /* | |
148 | * ms_chghost | |
212380e3 AC |
149 | * parv[1] = target |
150 | * parv[2] = host | |
151 | */ | |
3c7d6fcc | 152 | static void |
428ca87b | 153 | ms_chghost(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, |
212380e3 AC |
154 | int parc, const char *parv[]) |
155 | { | |
156 | struct Client *target_p; | |
157 | ||
158 | if (!(target_p = find_person(parv[1]))) | |
3c7d6fcc | 159 | return; |
212380e3 AC |
160 | |
161 | if (do_chghost(source_p, target_p, parv[2], 0)) | |
162 | { | |
163 | sendto_server(client_p, NULL, | |
164 | CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s %s", | |
165 | use_id(source_p), use_id(target_p), parv[2]); | |
166 | sendto_server(client_p, NULL, | |
167 | CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s", | |
168 | use_id(source_p), use_id(target_p), parv[2]); | |
212380e3 AC |
169 | } |
170 | ||
3c7d6fcc | 171 | return; |
212380e3 AC |
172 | } |
173 | ||
174 | /* | |
175 | * me_chghost | |
212380e3 AC |
176 | * parv[1] = target |
177 | * parv[2] = host | |
178 | */ | |
3c7d6fcc | 179 | static void |
428ca87b | 180 | me_chghost(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, |
212380e3 AC |
181 | int parc, const char *parv[]) |
182 | { | |
183 | struct Client *target_p; | |
184 | ||
185 | if (!(target_p = find_person(parv[1]))) | |
3c7d6fcc | 186 | return; |
212380e3 AC |
187 | |
188 | do_chghost(source_p, target_p, parv[2], 1); | |
212380e3 AC |
189 | } |
190 | ||
191 | /* | |
192 | * mo_chghost | |
212380e3 AC |
193 | * parv[1] = target |
194 | * parv[2] = host | |
195 | */ | |
196 | /* Disable this because of the abuse potential -- jilles | |
197 | * No, make it toggleable via ./configure. --nenolod | |
198 | */ | |
3c7d6fcc | 199 | static void |
428ca87b | 200 | mo_chghost(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, |
212380e3 AC |
201 | int parc, const char *parv[]) |
202 | { | |
203 | #ifdef ENABLE_OPER_CHGHOST | |
204 | struct Client *target_p; | |
205 | ||
206 | if(!IsOperAdmin(source_p)) | |
207 | { | |
208 | sendto_one(source_p, form_str(ERR_NOPRIVS), | |
209 | me.name, source_p->name, "admin"); | |
3c7d6fcc | 210 | return; |
212380e3 AC |
211 | } |
212 | ||
213 | if (!(target_p = find_named_person(parv[1]))) | |
214 | { | |
215 | sendto_one_numeric(source_p, ERR_NOSUCHNICK, | |
216 | form_str(ERR_NOSUCHNICK), parv[1]); | |
3c7d6fcc | 217 | return; |
212380e3 AC |
218 | } |
219 | ||
220 | if (!clean_host(parv[2])) | |
221 | { | |
222 | sendto_one_notice(source_p, ":Hostname %s is invalid", parv[2]); | |
3c7d6fcc | 223 | return; |
212380e3 AC |
224 | } |
225 | ||
226 | do_chghost(source_p, target_p, parv[2], 0); | |
227 | ||
228 | sendto_server(NULL, NULL, | |
229 | CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s %s", | |
230 | use_id(source_p), use_id(target_p), parv[2]); | |
231 | sendto_server(NULL, NULL, | |
232 | CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s", | |
233 | use_id(source_p), use_id(target_p), parv[2]); | |
212380e3 | 234 | #else |
22f2f68a JT |
235 | sendto_one_numeric(source_p, ERR_DISABLED, form_str(ERR_DISABLED), |
236 | "CHGHOST"); | |
212380e3 | 237 | #endif |
212380e3 AC |
238 | } |
239 |