extensions/ip_cloaking_old.c

   1
   2 #include "stdinc.h"
   3 #include "modules.h"
   4 #include "hook.h"
   5 #include "client.h"
   6 #include "ircd.h"
   7 #include "send.h"
   8 #include "s_conf.h"
   9 #include "s_user.h"
  10 #include "s_serv.h"
  11 #include "numeric.h"
  12
  13 /* if you're modifying this module, you'll probably to change this */
  14 #define KEY 0x13748cfa
  15
  16 static int
  17 _modinit(void)
  18 {
  19         /* add the usermode to the available slot */
  20         user_modes['h'] = find_umode_slot();
  21         construct_umodebuf();
  22
  23         return 0;
  24 }
  25
  26 static void
  27 _moddeinit(void)
  28 {
  29         /* disable the umode and remove it from the available list */
  30         user_modes['h'] = 0;
  31         construct_umodebuf();
  32 }
  33
  34 static void check_umode_change(void *data);
  35 static void check_new_user(void *data);
  36 mapi_hfn_list_av1 ip_cloaking_hfnlist[] = {
  37         { "umode_changed", (hookfn) check_umode_change },
  38         { "new_local_user", (hookfn) check_new_user },
  39         { NULL, NULL }
  40 };
  41
  42 DECLARE_MODULE_AV1(ip_cloaking, _modinit, _moddeinit, NULL, NULL,
  43                         ip_cloaking_hfnlist, NULL);
  44
  45 static void
  46 distribute_hostchange(struct Client *client_p, char *newhost)
  47 {
  48         if (newhost != client_p->orighost)
  49                 sendto_one_numeric(client_p, RPL_HOSTHIDDEN, "%s :is now your hidden host",
  50                         newhost);
  51         else
  52                 sendto_one_numeric(client_p, RPL_HOSTHIDDEN, "%s :hostname reset",
  53                         newhost);
  54
  55         sendto_server(NULL, NULL,
  56                 CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s :%s",
  57                 use_id(&me), use_id(client_p), newhost);
  58         sendto_server(NULL, NULL,
  59                 CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
  60                 use_id(&me), use_id(client_p), newhost);
  61
  62         change_nick_user_host(client_p, client_p->name, client_p->username, newhost, 0, "Changing host");
  63
  64         if (newhost != client_p->orighost)
  65                 SetDynSpoof(client_p);
  66         else
  67                 ClearDynSpoof(client_p);
  68 }
  69
  70 static void
  71 do_host_cloak(const char *inbuf, char *outbuf, int ipmask)
  72 {
  73         unsigned int cyc;
  74         unsigned int hosthash = 1, hosthash2 = 1;
  75         unsigned int maxcycle = strlen(inbuf);
  76         int len1;
  77         const char *rest, *next;
  78
  79         for (cyc = 0; cyc < maxcycle - 2; cyc += 2)
  80                 hosthash *= (unsigned int) inbuf[cyc];
  81
  82         /* safety: decrement ourselves two steps back */
  83         for (cyc = maxcycle - 1; cyc >= 1; cyc -= 2)
  84                 hosthash2 *= (unsigned int) inbuf[cyc];
  85
  86         /* lets do some bitshifting -- this pretty much destroys the IP
  87          * sequence, while still providing a checksum. exactly what
  88          * we're shooting for. --nenolod
  89          */
  90         hosthash += (hosthash2 / KEY);
  91         hosthash2 += (hosthash / KEY);
  92
  93         if (ipmask == 0)
  94         {
  95                 snprintf(outbuf, HOSTLEN, "%s-%X%X",
  96                         ServerInfo.network_name, hosthash2, hosthash);
  97                 len1 = strlen(outbuf);
  98                 rest = strchr(inbuf, '.');
  99                 if (rest == NULL)
 100                         rest = ".";
 101                 /* try to avoid truncation -- jilles */
 102                 while (len1 + strlen(rest) >= HOSTLEN && (next = strchr(rest + 1, '.')) != NULL)
 103                         rest = next;
 104                 rb_strlcat(outbuf, rest, HOSTLEN);
 105         }
 106         else
 107                 snprintf(outbuf, HOSTLEN, "%X%X.%s",
 108                         hosthash2, hosthash, ServerInfo.network_name);
 109 }
 110
 111 static void
 112 check_umode_change(void *vdata)
 113 {
 114         hook_data_umode_changed *data = (hook_data_umode_changed *)vdata;
 115         struct Client *source_p = data->client;
 116
 117         if (!MyClient(source_p))
 118                 return;
 119
 120         /* didn't change +h umode, we don't need to do anything */
 121         if (!((data->oldumodes ^ source_p->umodes) & user_modes['h']))
 122                 return;
 123
 124         if (source_p->umodes & user_modes['h'])
 125         {
 126                 if (IsIPSpoof(source_p) || source_p->localClient->mangledhost == NULL || (IsDynSpoof(source_p) && strcmp(source_p->host, source_p->localClient->mangledhost)))
 127                 {
 128                         source_p->umodes &= ~user_modes['h'];
 129                         return;
 130                 }
 131                 if (strcmp(source_p->host, source_p->localClient->mangledhost))
 132                 {
 133                         distribute_hostchange(source_p, source_p->localClient->mangledhost);
 134                 }
 135                 else /* not really nice, but we need to send this numeric here */
 136                         sendto_one_numeric(source_p, RPL_HOSTHIDDEN, "%s :is now your hidden host",
 137                                 source_p->host);
 138         }
 139         else if (!(source_p->umodes & user_modes['h']))
 140         {
 141                 if (source_p->localClient->mangledhost != NULL &&
 142                                 !strcmp(source_p->host, source_p->localClient->mangledhost))
 143                 {
 144                         distribute_hostchange(source_p, source_p->orighost);
 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 }