extensions/ip_cloaking_old.c

   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"
  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         if (irccmp(client->host, client->orighost))
  63                 SetDynSpoof(client);
  64         else
  65                 ClearDynSpoof(client);
  66 }
  67
  68 static void
  69 do_host_cloak(const char *inbuf, char *outbuf, int ipmask)
  70 {
  71         int cyc;
  72         unsigned int hosthash = 1, hosthash2 = 1;
  73         unsigned int maxcycle = strlen(inbuf);
  74         int len1;
  75         const char *rest, *next;
  76
  77         for (cyc = 0; cyc < maxcycle - 2; cyc += 2)
  78                 hosthash *= (unsigned int) inbuf[cyc];
  79
  80         /* safety: decrement ourselves two steps back */
  81         for (cyc = maxcycle - 1; cyc >= 1; cyc -= 2)
  82                 hosthash2 *= (unsigned int) inbuf[cyc];
  83
  84         /* lets do some bitshifting -- this pretty much destroys the IP
  85          * sequence, while still providing a checksum. exactly what
  86          * we're shooting for. --nenolod
  87          */
  88         hosthash += (hosthash2 / KEY);
  89         hosthash2 += (hosthash / KEY);
  90
  91         if (ipmask == 0)
  92         {
  93                 rb_snprintf(outbuf, HOSTLEN, "%s-%X%X",
  94                         ServerInfo.network_name, hosthash2, hosthash);
  95                 len1 = strlen(outbuf);
  96                 rest = strchr(inbuf, '.');
  97                 if (rest == NULL)
  98                         rest = ".";
  99                 /* try to avoid truncation -- jilles */
 100                 while (len1 + strlen(rest) >= HOSTLEN && (next = strchr(rest + 1, '.')) != NULL)
 101                         rest = next;
 102                 rb_strlcat(outbuf, rest, HOSTLEN);
 103         }
 104         else
 105                 rb_snprintf(outbuf, HOSTLEN, "%X%X.%s",
 106                         hosthash2, hosthash, ServerInfo.network_name);
 107 }
 108
 109 static void
 110 check_umode_change(void *vdata)
 111 {
 112         hook_data_umode_changed *data = (hook_data_umode_changed *)vdata;
 113         struct Client *source_p = data->client;
 114
 115         if (!MyClient(source_p))
 116                 return;
 117
 118         /* didn't change +h umode, we don't need to do anything */
 119         if (!((data->oldumodes ^ source_p->umodes) & user_modes['h']))
 120                 return;
 121
 122         if (source_p->umodes & user_modes['h'])
 123         {
 124                 if (IsIPSpoof(source_p) || source_p->localClient->mangledhost == NULL || (IsDynSpoof(source_p) && strcmp(source_p->host, source_p->localClient->mangledhost)))
 125                 {
 126                         source_p->umodes &= ~user_modes['h'];
 127                         return;
 128                 }
 129                 if (strcmp(source_p->host, source_p->localClient->mangledhost))
 130                 {
 131                         rb_strlcpy(source_p->host, source_p->localClient->mangledhost, HOSTLEN);
 132                         distribute_hostchange(source_p);
 133                 }
 134                 else /* not really nice, but we need to send this numeric here */
 135                         sendto_one_numeric(source_p, RPL_HOSTHIDDEN, "%s :is now your hidden host",
 136                                 source_p->host);
 137         }
 138         else if (!(source_p->umodes & user_modes['h']))
 139         {
 140                 if (source_p->localClient->mangledhost != NULL &&
 141                                 !strcmp(source_p->host, source_p->localClient->mangledhost))
 142                 {
 143                         rb_strlcpy(source_p->host, source_p->orighost, HOSTLEN);
 144                         distribute_hostchange(source_p);
 145                 }
 146         }
 147 }
 148
 149 static void
 150 check_new_user(void *vdata)
 151 {
 152         struct Client *source_p = (void *)vdata;
 153
 154         if (IsIPSpoof(source_p))
 155         {
 156                 source_p->umodes &= ~user_modes['h'];
 157                 return;
 158         }
 159         source_p->localClient->mangledhost = rb_malloc(HOSTLEN);
 160         if (!irccmp(source_p->orighost, source_p->sockhost))
 161                 do_host_cloak(source_p->orighost, source_p->localClient->mangledhost, 1);
 162         else
 163                 do_host_cloak(source_p->orighost, source_p->localClient->mangledhost, 0);
 164         if (IsDynSpoof(source_p))
 165                 source_p->umodes &= ~user_modes['h'];
 166         if (source_p->umodes & user_modes['h'])
 167         {
 168                 rb_strlcpy(source_p->host, source_p->localClient->mangledhost, sizeof(source_p->host));
 169                 if (irccmp(source_p->host, source_p->orighost))
 170                         SetDynSpoof(source_p);
 171         }
 172 }