2 * Copyright (c) 2005 William Pitcock <nenolod -at- nenolod.net>
3 * and Jilles Tjoelker <jilles -at- stack.nl>
6 * Redistribution in both source and binary forms are permitted
7 * provided that the above copyright notice remains unchanged.
9 * m_chghost.c: A module for handling spoofing dynamically.
20 #include "s_newconf.h"
30 static const char chghost_desc
[] = "Provides commands used to change and retrieve client hostnames";
32 static void me_realhost(struct MsgBuf
*, struct Client
*, struct Client
*, int, const char **);
33 static void ms_chghost(struct MsgBuf
*, struct Client
*, struct Client
*, int, const char **);
34 static void me_chghost(struct MsgBuf
*, struct Client
*, struct Client
*, int, const char **);
35 static void mo_chghost(struct MsgBuf
*, struct Client
*, struct Client
*, int, const char **);
37 struct Message realhost_msgtab
= {
38 "REALHOST", 0, 0, 0, 0,
39 {mg_ignore
, mg_ignore
, mg_ignore
, mg_ignore
, {me_realhost
, 2}, mg_ignore
}
42 struct Message chghost_msgtab
= {
43 "CHGHOST", 0, 0, 0, 0,
44 {mg_ignore
, mg_not_oper
, {ms_chghost
, 3}, {ms_chghost
, 3}, {me_chghost
, 3}, {mo_chghost
, 3}}
47 mapi_clist_av1 chghost_clist
[] = { &chghost_msgtab
, &realhost_msgtab
, NULL
};
49 DECLARE_MODULE_AV2(chghost
, NULL
, NULL
, chghost_clist
, NULL
, NULL
, NULL
, NULL
, chghost_desc
);
53 * input - host to check
54 * output - false if erroneous, else true
58 clean_host(const char *host
)
61 const char *last_slash
= 0;
63 if (*host
== '\0' || *host
== ':')
70 if(!IsHostChar(*host
))
79 if(last_slash
&& IsDigit(last_slash
[1]))
89 * Yes this contains a little race condition if someone does a whois
90 * in between the UID and REALHOST and use_whois_actually is enabled.
91 * I don't think that's a big problem as the whole thing is a
95 me_realhost(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
96 int parc
, const char *parv
[])
98 if (!IsPerson(source_p
))
101 del_from_hostname_hash(source_p
->orighost
, source_p
);
102 rb_strlcpy(source_p
->orighost
, parv
[1], sizeof source_p
->orighost
);
103 if (irccmp(source_p
->host
, source_p
->orighost
))
104 SetDynSpoof(source_p
);
106 ClearDynSpoof(source_p
);
107 add_to_hostname_hash(source_p
->orighost
, source_p
);
111 do_chghost(struct Client
*source_p
, struct Client
*target_p
,
112 const char *newhost
, int is_encap
)
114 if (!clean_host(newhost
))
116 sendto_realops_snomask(SNO_GENERAL
, is_encap
? L_ALL
: L_NETWIDE
, "%s attempted to change hostname for %s to %s (invalid)",
117 IsServer(source_p
) ? source_p
->name
: get_oper_name(source_p
),
118 target_p
->name
, newhost
);
119 /* sending this remotely may disclose important
120 * routing information -- jilles */
121 if (is_encap
? MyClient(target_p
) : !ConfigServerHide
.flatten_links
)
122 sendto_one_notice(target_p
, ":*** Notice -- %s attempted to change your hostname to %s (invalid)",
123 source_p
->name
, newhost
);
126 change_nick_user_host(target_p
, target_p
->name
, target_p
->username
, newhost
, 0, "Changing host");
127 if (irccmp(target_p
->host
, target_p
->orighost
))
129 SetDynSpoof(target_p
);
130 if (MyClient(target_p
))
131 sendto_one_numeric(target_p
, RPL_HOSTHIDDEN
, "%s :is now your hidden host (set by %s)", target_p
->host
, source_p
->name
);
135 ClearDynSpoof(target_p
);
136 if (MyClient(target_p
))
137 sendto_one_numeric(target_p
, RPL_HOSTHIDDEN
, "%s :hostname reset by %s", target_p
->host
, source_p
->name
);
139 if (MyClient(source_p
))
140 sendto_one_notice(source_p
, ":Changed hostname for %s to %s", target_p
->name
, target_p
->host
);
141 if (!IsServer(source_p
) && !IsService(source_p
))
142 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
);
152 ms_chghost(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
153 int parc
, const char *parv
[])
155 struct Client
*target_p
;
157 if (!(target_p
= find_person(parv
[1])))
160 if (do_chghost(source_p
, target_p
, parv
[2], 0))
162 sendto_server(client_p
, NULL
,
163 CAP_EUID
| CAP_TS6
, NOCAPS
, ":%s CHGHOST %s %s",
164 use_id(source_p
), use_id(target_p
), parv
[2]);
165 sendto_server(client_p
, NULL
,
166 CAP_TS6
, CAP_EUID
, ":%s ENCAP * CHGHOST %s :%s",
167 use_id(source_p
), use_id(target_p
), parv
[2]);
179 me_chghost(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
180 int parc
, const char *parv
[])
182 struct Client
*target_p
;
184 if (!(target_p
= find_person(parv
[1])))
187 do_chghost(source_p
, target_p
, parv
[2], 1);
195 /* Disable this because of the abuse potential -- jilles
196 * No, make it toggleable via ./configure. --nenolod
199 mo_chghost(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
200 int parc
, const char *parv
[])
202 #ifdef ENABLE_OPER_CHGHOST
203 struct Client
*target_p
;
205 if(!IsOperAdmin(source_p
))
207 sendto_one(source_p
, form_str(ERR_NOPRIVS
),
208 me
.name
, source_p
->name
, "admin");
212 if (!(target_p
= find_named_person(parv
[1])))
214 sendto_one_numeric(source_p
, ERR_NOSUCHNICK
,
215 form_str(ERR_NOSUCHNICK
), parv
[1]);
219 if (!clean_host(parv
[2]))
221 sendto_one_notice(source_p
, ":Hostname %s is invalid", parv
[2]);
225 do_chghost(source_p
, target_p
, parv
[2], 0);
227 sendto_server(NULL
, NULL
,
228 CAP_EUID
| CAP_TS6
, NOCAPS
, ":%s CHGHOST %s %s",
229 use_id(source_p
), use_id(target_p
), parv
[2]);
230 sendto_server(NULL
, NULL
,
231 CAP_TS6
, CAP_EUID
, ":%s ENCAP * CHGHOST %s :%s",
232 use_id(source_p
), use_id(target_p
), parv
[2]);
234 sendto_one_numeric(source_p
, ERR_DISABLED
, form_str(ERR_DISABLED
),