-/* $Id: ip_cloaking.c 3526 2007-07-06 07:56:14Z nenolod $ */
-
-#include "stdinc.h"
-#include "modules.h"
-#include "hook.h"
-#include "client.h"
-#include "ircd.h"
-#include "send.h"
-#include "s_conf.h"
-#include "s_user.h"
-#include "s_serv.h"
-#include "numeric.h"
-
-/* if you're modifying this module, you'll probably to change this */
-#define KEY 0x13748cfa
-
-static int
-_modinit(void)
-{
- /* add the usermode to the available slot */
- user_modes['h'] = find_umode_slot();
- construct_umodebuf();
-
- return 0;
-}
-
-static void
-_moddeinit(void)
-{
- /* disable the umode and remove it from the available list */
- user_modes['h'] = 0;
- construct_umodebuf();
-}
-
-static void check_umode_change(void *data);
-static void check_new_user(void *data);
-mapi_hfn_list_av1 ip_cloaking_hfnlist[] = {
- { "umode_changed", (hookfn) check_umode_change },
- { "new_local_user", (hookfn) check_new_user },
- { NULL, NULL }
-};
-
-DECLARE_MODULE_AV1(ip_cloaking, _modinit, _moddeinit, NULL, NULL,
- ip_cloaking_hfnlist, "$Revision: 3526 $");
-
-static void
-distribute_hostchange(struct Client *client)
-{
- if (irccmp(client->host, client->orighost))
- sendto_one_numeric(client, RPL_HOSTHIDDEN, "%s :is now your hidden host",
- client->host);
- else
- sendto_one_numeric(client, RPL_HOSTHIDDEN, "%s :hostname reset",
- client->host);
-
- sendto_server(NULL, NULL,
- CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s :%s",
- use_id(&me), use_id(client), client->host);
- sendto_server(NULL, NULL,
- CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
- use_id(&me), use_id(client), client->host);
- if (irccmp(client->host, client->orighost))
- SetDynSpoof(client);
- else
- ClearDynSpoof(client);
-}
-
-#define Nval 0x8c3a48ac
-#define HOSTLEN 63
-#define INITDATA "98fwqefnoiqefv03f423t34gbv3vb89tg432t3b8" /* change this */
-
-static inline unsigned int
-get_string_entropy(const char *inbuf)
-{
- unsigned int accum = 1;
-
- while(*inbuf != '\0')
- accum += *inbuf++;
-
- return accum;
-}
-
-/* calls get_string_entropy() and toasts it against INITDATA */
-static inline unsigned int
-get_string_weighted_entropy(const char *inbuf)
-{
- static int base_entropy = 0;
- unsigned int accum = get_string_entropy(inbuf);
-
- /* initialize the algorithm if it is not yet ready */
- if (base_entropy == 0)
- base_entropy = get_string_entropy(INITDATA);
-
- return (Nval * accum) ^ base_entropy;
-}
-
-static void
-do_host_cloak_ip(const char *inbuf, char *outbuf)
-{
- char *tptr;
- unsigned int accum = get_string_weighted_entropy(inbuf);
- char buf[HOSTLEN];
- int ipv6 = 0;
-
- strncpy(buf, inbuf, HOSTLEN);
- tptr = strrchr(buf, '.');
-
- if (tptr == NULL)
- {
- tptr = strrchr(buf, ':');
- ipv6 = 1;
- }
-
- if (tptr == NULL)
- {
- strncpy(outbuf, inbuf, HOSTLEN);
- return;
- }
-
- *tptr++ = '\0';
-
- if(ipv6)
- {
- rb_snprintf(outbuf, HOSTLEN, "%s:%x", buf, accum);
- }
- else
- {
- rb_snprintf(outbuf, HOSTLEN, "%s.%x", buf, accum);
- }
-}
-
-static void
-do_host_cloak_host(const char *inbuf, char *outbuf)
-{
- char b26_alphabet[] = "abcdefghijklmnopqrstuvwxyz";
- char *tptr;
- unsigned int accum = get_string_weighted_entropy(inbuf);
-
- strncpy(outbuf, inbuf, HOSTLEN);
-
- /* pass 1: scramble first section of hostname using base26
- * alphabet toasted against the weighted entropy of the string.
- *
- * numbers are not changed at this time, only letters.
- */
- for (tptr = outbuf; *tptr != '\0'; tptr++)
- {
- if (*tptr == '.')
- break;
-
- if (isdigit(*tptr) || *tptr == '-')
- continue;
-
- *tptr = b26_alphabet[(*tptr * accum) % 26];
- }
-
- /* pass 2: scramble each number in the address */
- for (tptr = outbuf; *tptr != '\0'; tptr++)
- {
- if (isdigit(*tptr))
- {
- *tptr = 48 + ((*tptr * accum) % 10);
- }
- }
-}
-
-static void
-check_umode_change(void *vdata)
-{
- hook_data_umode_changed *data = (hook_data_umode_changed *)vdata;
- struct Client *source_p = data->client;
-
- if (!MyClient(source_p))
- return;
-
- /* didn't change +h umode, we don't need to do anything */
- if (!((data->oldumodes ^ source_p->umodes) & user_modes['h']))
- return;
-
- if (source_p->umodes & user_modes['h'])
- {
- if (IsIPSpoof(source_p) || source_p->localClient->mangledhost == NULL || (IsDynSpoof(source_p) && strcmp(source_p->host, source_p->localClient->mangledhost)))
- {
- source_p->umodes &= ~user_modes['h'];
- return;
- }
- if (strcmp(source_p->host, source_p->localClient->mangledhost))
- {
- rb_strlcpy(source_p->host, source_p->localClient->mangledhost, HOSTLEN);
- distribute_hostchange(source_p);
- }
- else /* not really nice, but we need to send this numeric here */
- sendto_one_numeric(source_p, RPL_HOSTHIDDEN, "%s :is now your hidden host",
- source_p->host);
- }
- else if (!(source_p->umodes & user_modes['h']))
- {
- if (source_p->localClient->mangledhost != NULL &&
- !strcmp(source_p->host, source_p->localClient->mangledhost))
- {
- rb_strlcpy(source_p->host, source_p->orighost, HOSTLEN);
- distribute_hostchange(source_p);
- }
- }
-}
-
-static void
-check_new_user(void *vdata)
-{
- struct Client *source_p = (void *)vdata;
-
- if (IsIPSpoof(source_p))
- {
- source_p->umodes &= ~user_modes['h'];
- return;
- }
- source_p->localClient->mangledhost = rb_malloc(HOSTLEN);
- if (!irccmp(source_p->orighost, source_p->sockhost))
- do_host_cloak_ip(source_p->orighost, source_p->localClient->mangledhost);
- else
- do_host_cloak_host(source_p->orighost, source_p->localClient->mangledhost);
- if (IsDynSpoof(source_p))
- source_p->umodes &= ~user_modes['h'];
- if (source_p->umodes & user_modes['h'])
- {
- rb_strlcpy(source_p->host, source_p->localClient->mangledhost, sizeof(source_p->host));
- if (irccmp(source_p->host, source_p->orighost))
- SetDynSpoof(source_p);
- }
-}
projects / irc / rqf / shadowircd.git / commitdiff
