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         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         {
  96                 rb_snprintf(outbuf, HOSTLEN, "%s-%X%X",
  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;
 105                 strlcat(outbuf, rest, HOSTLEN);
 106         }
 107         else
 108                 rb_snprintf(outbuf, HOSTLEN, "%X%X.%s",
 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                 {
 134                         rb_strlcpy(source_p->host, source_p->localClient->mangledhost, HOSTLEN);
 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                 {
 146                         rb_strlcpy(source_p->host, source_p->orighost, HOSTLEN);
 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         }
 162         source_p->localClient->mangledhost = rb_malloc(HOSTLEN);
 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         {
 171                 rb_strlcpy(source_p->host, source_p->localClient->mangledhost, sizeof(source_p->host));
 172                 if (irccmp(source_p->host, source_p->orighost))
 173                         SetDynSpoof(source_p);
 174         }
 175 }