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762cc38c AC |
1 | /* $Id: ip_cloaking_old.c 3522 2007-07-06 07:48:28Z nenolod $ */ |
2 | ||
3 | #include "stdinc.h" | |
4 | #include "modules.h" | |
5 | #include "hook.h" | |
6 | #include "client.h" | |
7 | #include "ircd.h" | |
8 | #include "send.h" | |
9 | #include "s_conf.h" | |
10 | #include "s_user.h" | |
11 | #include "s_serv.h" | |
762cc38c AC |
12 | #include "numeric.h" |
13 | ||
14 | /* if you're modifying this module, you'll probably to change this */ | |
15 | #define KEY 0x13748cfa | |
16 | ||
17 | static int | |
18 | _modinit(void) | |
19 | { | |
20 | /* add the usermode to the available slot */ | |
21 | user_modes['h'] = find_umode_slot(); | |
22 | construct_umodebuf(); | |
23 | ||
24 | return 0; | |
25 | } | |
26 | ||
27 | static void | |
28 | _moddeinit(void) | |
29 | { | |
30 | /* disable the umode and remove it from the available list */ | |
31 | user_modes['h'] = 0; | |
32 | construct_umodebuf(); | |
33 | } | |
34 | ||
35 | static void check_umode_change(void *data); | |
36 | static void check_new_user(void *data); | |
37 | mapi_hfn_list_av1 ip_cloaking_hfnlist[] = { | |
38 | { "umode_changed", (hookfn) check_umode_change }, | |
39 | { "new_local_user", (hookfn) check_new_user }, | |
40 | { NULL, NULL } | |
41 | }; | |
42 | ||
43 | DECLARE_MODULE_AV1(ip_cloaking, _modinit, _moddeinit, NULL, NULL, | |
44 | ip_cloaking_hfnlist, "$Revision: 3522 $"); | |
45 | ||
46 | static void | |
47 | distribute_hostchange(struct Client *client) | |
48 | { | |
49 | if (irccmp(client->host, client->orighost)) | |
50 | sendto_one_numeric(client, RPL_HOSTHIDDEN, "%s :is now your hidden host", | |
51 | client->host); | |
52 | else | |
53 | sendto_one_numeric(client, RPL_HOSTHIDDEN, "%s :hostname reset", | |
54 | client->host); | |
55 | ||
56 | sendto_server(NULL, NULL, | |
57 | CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s :%s", | |
58 | use_id(&me), use_id(client), client->host); | |
59 | sendto_server(NULL, NULL, | |
60 | CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s", | |
61 | use_id(&me), use_id(client), client->host); | |
62 | sendto_server(NULL, NULL, | |
63 | NOCAPS, CAP_TS6, ":%s ENCAP * CHGHOST %s :%s", | |
64 | me.name, client->name, client->host); | |
65 | if (irccmp(client->host, client->orighost)) | |
66 | SetDynSpoof(client); | |
67 | else | |
68 | ClearDynSpoof(client); | |
69 | } | |
70 | ||
71 | static void | |
72 | do_host_cloak(const char *inbuf, char *outbuf, int ipmask) | |
73 | { | |
74 | int cyc; | |
75 | unsigned int hosthash = 1, hosthash2 = 1; | |
76 | unsigned int maxcycle = strlen(inbuf); | |
77 | int len1; | |
78 | const char *rest, *next; | |
79 | ||
80 | for (cyc = 0; cyc < maxcycle - 2; cyc += 2) | |
81 | hosthash *= (unsigned int) inbuf[cyc]; | |
82 | ||
83 | /* safety: decrement ourselves two steps back */ | |
84 | for (cyc = maxcycle - 1; cyc >= 1; cyc -= 2) | |
85 | hosthash2 *= (unsigned int) inbuf[cyc]; | |
86 | ||
87 | /* lets do some bitshifting -- this pretty much destroys the IP | |
88 | * sequence, while still providing a checksum. exactly what | |
89 | * we're shooting for. --nenolod | |
90 | */ | |
91 | hosthash += (hosthash2 / KEY); | |
92 | hosthash2 += (hosthash / KEY); | |
93 | ||
94 | if (ipmask == 0) | |
95 | { | |
036a10a9 | 96 | rb_snprintf(outbuf, HOSTLEN, "%s-%X%X", |
762cc38c AC |
97 | ServerInfo.network_name, hosthash2, hosthash); |
98 | len1 = strlen(outbuf); | |
99 | rest = strchr(inbuf, '.'); | |
100 | if (rest == NULL) | |
101 | rest = "."; | |
102 | /* try to avoid truncation -- jilles */ | |
103 | while (len1 + strlen(rest) >= HOSTLEN && (next = strchr(rest + 1, '.')) != NULL) | |
104 | rest = next; | |
1f9de103 | 105 | rb_strlcat(outbuf, rest, HOSTLEN); |
762cc38c AC |
106 | } |
107 | else | |
036a10a9 | 108 | rb_snprintf(outbuf, HOSTLEN, "%X%X.%s", |
762cc38c AC |
109 | hosthash2, hosthash, ServerInfo.network_name); |
110 | } | |
111 | ||
112 | static void | |
113 | check_umode_change(void *vdata) | |
114 | { | |
115 | hook_data_umode_changed *data = (hook_data_umode_changed *)vdata; | |
116 | struct Client *source_p = data->client; | |
117 | ||
118 | if (!MyClient(source_p)) | |
119 | return; | |
120 | ||
121 | /* didn't change +h umode, we don't need to do anything */ | |
122 | if (!((data->oldumodes ^ source_p->umodes) & user_modes['h'])) | |
123 | return; | |
124 | ||
125 | if (source_p->umodes & user_modes['h']) | |
126 | { | |
127 | if (IsIPSpoof(source_p) || source_p->localClient->mangledhost == NULL || (IsDynSpoof(source_p) && strcmp(source_p->host, source_p->localClient->mangledhost))) | |
128 | { | |
129 | source_p->umodes &= ~user_modes['h']; | |
130 | return; | |
131 | } | |
132 | if (strcmp(source_p->host, source_p->localClient->mangledhost)) | |
133 | { | |
f427c8b0 | 134 | rb_strlcpy(source_p->host, source_p->localClient->mangledhost, HOSTLEN); |
762cc38c AC |
135 | distribute_hostchange(source_p); |
136 | } | |
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", | |
139 | source_p->host); | |
140 | } | |
141 | else if (!(source_p->umodes & user_modes['h'])) | |
142 | { | |
143 | if (source_p->localClient->mangledhost != NULL && | |
144 | !strcmp(source_p->host, source_p->localClient->mangledhost)) | |
145 | { | |
f427c8b0 | 146 | rb_strlcpy(source_p->host, source_p->orighost, HOSTLEN); |
762cc38c AC |
147 | distribute_hostchange(source_p); |
148 | } | |
149 | } | |
150 | } | |
151 | ||
152 | static void | |
153 | check_new_user(void *vdata) | |
154 | { | |
155 | struct Client *source_p = (void *)vdata; | |
156 | ||
157 | if (IsIPSpoof(source_p)) | |
158 | { | |
159 | source_p->umodes &= ~user_modes['h']; | |
160 | return; | |
161 | } | |
954012d3 | 162 | source_p->localClient->mangledhost = rb_malloc(HOSTLEN); |
762cc38c AC |
163 | if (!irccmp(source_p->orighost, source_p->sockhost)) |
164 | do_host_cloak(source_p->orighost, source_p->localClient->mangledhost, 1); | |
165 | else | |
166 | do_host_cloak(source_p->orighost, source_p->localClient->mangledhost, 0); | |
167 | if (IsDynSpoof(source_p)) | |
168 | source_p->umodes &= ~user_modes['h']; | |
169 | if (source_p->umodes & user_modes['h']) | |
170 | { | |
f427c8b0 | 171 | rb_strlcpy(source_p->host, source_p->localClient->mangledhost, sizeof(source_p->host)); |
762cc38c AC |
172 | if (irccmp(source_p->host, source_p->orighost)) |
173 | SetDynSpoof(source_p); | |
174 | } | |
175 | } |