13 static const char ip_cloaking_desc
[] = "Very old IP cloaking mechanism";
15 /* if you're modifying this module, you'll probably want to change this */
16 #define KEY 0x13748cfa
21 /* add the usermode to the available slot */
22 user_modes
['h'] = find_umode_slot();
31 /* disable the umode and remove it from the available list */
36 static void check_umode_change(void *data
);
37 static void check_new_user(void *data
);
38 mapi_hfn_list_av1 ip_cloaking_hfnlist
[] = {
39 { "umode_changed", (hookfn
) check_umode_change
},
40 { "new_local_user", (hookfn
) check_new_user
},
44 DECLARE_MODULE_AV2(ip_cloaking
, _modinit
, _moddeinit
, NULL
, NULL
,
45 ip_cloaking_hfnlist
, NULL
, NULL
, ip_cloaking_desc
);
48 distribute_hostchange(struct Client
*client_p
, char *newhost
)
50 if (newhost
!= client_p
->orighost
)
51 sendto_one_numeric(client_p
, RPL_HOSTHIDDEN
, "%s :is now your hidden host",
54 sendto_one_numeric(client_p
, RPL_HOSTHIDDEN
, "%s :hostname reset",
57 sendto_server(NULL
, NULL
,
58 CAP_EUID
| CAP_TS6
, NOCAPS
, ":%s CHGHOST %s :%s",
59 use_id(&me
), use_id(client_p
), newhost
);
60 sendto_server(NULL
, NULL
,
61 CAP_TS6
, CAP_EUID
, ":%s ENCAP * CHGHOST %s :%s",
62 use_id(&me
), use_id(client_p
), newhost
);
64 change_nick_user_host(client_p
, client_p
->name
, client_p
->username
, newhost
, 0, "Changing host");
66 if (newhost
!= client_p
->orighost
)
67 SetDynSpoof(client_p
);
69 ClearDynSpoof(client_p
);
73 do_host_cloak(const char *inbuf
, char *outbuf
, int ipmask
)
76 unsigned int hosthash
= 1, hosthash2
= 1;
77 unsigned int maxcycle
= strlen(inbuf
);
79 const char *rest
, *next
;
81 for (cyc
= 0; cyc
< maxcycle
- 2; cyc
+= 2)
82 hosthash
*= (unsigned int) inbuf
[cyc
];
84 /* safety: decrement ourselves two steps back */
85 for (cyc
= maxcycle
- 1; cyc
>= 1; cyc
-= 2)
86 hosthash2
*= (unsigned int) inbuf
[cyc
];
88 /* lets do some bitshifting -- this pretty much destroys the IP
89 * sequence, while still providing a checksum. exactly what
90 * we're shooting for. --nenolod
92 hosthash
+= (hosthash2
/ KEY
);
93 hosthash2
+= (hosthash
/ KEY
);
97 snprintf(outbuf
, HOSTLEN
, "%s-%X%X",
98 ServerInfo
.network_name
, hosthash2
, hosthash
);
99 len1
= strlen(outbuf
);
100 rest
= strchr(inbuf
, '.');
103 /* try to avoid truncation -- jilles */
104 while (len1
+ strlen(rest
) >= HOSTLEN
&& (next
= strchr(rest
+ 1, '.')) != NULL
)
106 rb_strlcat(outbuf
, rest
, HOSTLEN
);
109 snprintf(outbuf
, HOSTLEN
, "%X%X.%s",
110 hosthash2
, hosthash
, ServerInfo
.network_name
);
114 check_umode_change(void *vdata
)
116 hook_data_umode_changed
*data
= (hook_data_umode_changed
*)vdata
;
117 struct Client
*source_p
= data
->client
;
119 if (!MyClient(source_p
))
122 /* didn't change +h umode, we don't need to do anything */
123 if (!((data
->oldumodes
^ source_p
->umodes
) & user_modes
['h']))
126 if (source_p
->umodes
& user_modes
['h'])
128 if (IsIPSpoof(source_p
) || source_p
->localClient
->mangledhost
== NULL
|| (IsDynSpoof(source_p
) && strcmp(source_p
->host
, source_p
->localClient
->mangledhost
)))
130 source_p
->umodes
&= ~user_modes
['h'];
133 if (strcmp(source_p
->host
, source_p
->localClient
->mangledhost
))
135 distribute_hostchange(source_p
, source_p
->localClient
->mangledhost
);
137 else /* not really nice, but we need to send this numeric here */
138 sendto_one_numeric(source_p
, RPL_HOSTHIDDEN
, "%s :is now your hidden host",
141 else if (!(source_p
->umodes
& user_modes
['h']))
143 if (source_p
->localClient
->mangledhost
!= NULL
&&
144 !strcmp(source_p
->host
, source_p
->localClient
->mangledhost
))
146 distribute_hostchange(source_p
, source_p
->orighost
);
152 check_new_user(void *vdata
)
154 struct Client
*source_p
= (void *)vdata
;
156 if (IsIPSpoof(source_p
))
158 source_p
->umodes
&= ~user_modes
['h'];
161 source_p
->localClient
->mangledhost
= rb_malloc(HOSTLEN
);
162 if (!irccmp(source_p
->orighost
, source_p
->sockhost
))
163 do_host_cloak(source_p
->orighost
, source_p
->localClient
->mangledhost
, 1);
165 do_host_cloak(source_p
->orighost
, source_p
->localClient
->mangledhost
, 0);
166 if (IsDynSpoof(source_p
))
167 source_p
->umodes
&= ~user_modes
['h'];
168 if (source_p
->umodes
& user_modes
['h'])
170 rb_strlcpy(source_p
->host
, source_p
->localClient
->mangledhost
, sizeof(source_p
->host
));
171 if (irccmp(source_p
->host
, source_p
->orighost
))
172 SetDynSpoof(source_p
);