Copy ip_cloaking.c to ip_cloaking_3.0.c
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William Pitcock
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ce1cab0ffd
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0469849f16
1 changed files with 230 additions and 0 deletions
230
extensions/ip_cloaking_3.0.c
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230
extensions/ip_cloaking_3.0.c
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/* $Id: ip_cloaking.c 3526 2007-07-06 07:56:14Z nenolod $ */
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#include "stdinc.h"
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#include "modules.h"
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#include "hook.h"
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#include "client.h"
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#include "ircd.h"
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#include "send.h"
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#include "s_conf.h"
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#include "s_user.h"
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#include "s_serv.h"
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#include "numeric.h"
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/* if you're modifying this module, you'll probably to change this */
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#define KEY 0x13748cfa
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static int
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_modinit(void)
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{
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/* add the usermode to the available slot */
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user_modes['h'] = find_umode_slot();
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construct_umodebuf();
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return 0;
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}
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static void
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_moddeinit(void)
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{
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/* disable the umode and remove it from the available list */
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user_modes['h'] = 0;
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construct_umodebuf();
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}
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static void check_umode_change(void *data);
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static void check_new_user(void *data);
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mapi_hfn_list_av1 ip_cloaking_hfnlist[] = {
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{ "umode_changed", (hookfn) check_umode_change },
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{ "new_local_user", (hookfn) check_new_user },
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{ NULL, NULL }
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};
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DECLARE_MODULE_AV1(ip_cloaking, _modinit, _moddeinit, NULL, NULL,
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ip_cloaking_hfnlist, "$Revision: 3526 $");
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static void
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distribute_hostchange(struct Client *client)
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{
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if (irccmp(client->host, client->orighost))
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sendto_one_numeric(client, RPL_HOSTHIDDEN, "%s :is now your hidden host",
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client->host);
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else
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sendto_one_numeric(client, RPL_HOSTHIDDEN, "%s :hostname reset",
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client->host);
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sendto_server(NULL, NULL,
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CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s :%s",
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use_id(&me), use_id(client), client->host);
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sendto_server(NULL, NULL,
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CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
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use_id(&me), use_id(client), client->host);
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if (irccmp(client->host, client->orighost))
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SetDynSpoof(client);
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else
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ClearDynSpoof(client);
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}
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#define Nval 0x8c3a48ac
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#define HOSTLEN 63
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#define INITDATA "98fwqefnoiqefv03f423t34gbv3vb89tg432t3b8" /* change this */
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static inline unsigned int
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get_string_entropy(const char *inbuf)
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{
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unsigned int accum = 1;
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while(*inbuf != '\0')
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accum += *inbuf++;
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return accum;
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}
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/* calls get_string_entropy() and toasts it against INITDATA */
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static inline unsigned int
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get_string_weighted_entropy(const char *inbuf)
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{
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static int base_entropy = 0;
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unsigned int accum = get_string_entropy(inbuf);
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/* initialize the algorithm if it is not yet ready */
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if (base_entropy == 0)
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base_entropy = get_string_entropy(INITDATA);
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return (Nval * accum) ^ base_entropy;
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}
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static void
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do_host_cloak_ip(const char *inbuf, char *outbuf)
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{
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char *tptr;
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unsigned int accum = get_string_weighted_entropy(inbuf);
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char buf[HOSTLEN];
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int ipv6 = 0;
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strncpy(buf, inbuf, HOSTLEN);
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tptr = strrchr(buf, '.');
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if (tptr == NULL)
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{
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tptr = strrchr(buf, ':');
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ipv6 = 1;
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}
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if (tptr == NULL)
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{
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strncpy(outbuf, inbuf, HOSTLEN);
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return;
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}
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*tptr++ = '\0';
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if(ipv6)
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{
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snprintf(outbuf, HOSTLEN, "%s:%x", buf, accum);
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}
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else
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{
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snprintf(outbuf, HOSTLEN, "%s.%x", buf, accum);
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}
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}
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static void
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do_host_cloak_host(const char *inbuf, char *outbuf)
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{
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char b26_alphabet[] = "abcdefghijklmnopqrstuvwxyz";
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char *tptr;
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unsigned int accum = get_string_weighted_entropy(inbuf);
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strncpy(outbuf, inbuf, HOSTLEN);
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/* pass 1: scramble first section of hostname using base26
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* alphabet toasted against the weighted entropy of the string.
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*
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* numbers are not changed at this time, only letters.
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*/
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for (tptr = outbuf; *tptr != '\0'; tptr++)
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{
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if (*tptr == '.')
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break;
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if (isdigit(*tptr) || *tptr == '-')
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continue;
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*tptr = b26_alphabet[(*tptr * accum) % 26];
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}
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/* pass 2: scramble each number in the address */
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for (tptr = outbuf; *tptr != '\0'; tptr++)
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{
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if (isdigit(*tptr))
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{
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*tptr = 48 + ((*tptr * accum) % 10);
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}
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}
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}
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static void
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check_umode_change(void *vdata)
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{
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hook_data_umode_changed *data = (hook_data_umode_changed *)vdata;
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struct Client *source_p = data->client;
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if (!MyClient(source_p))
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return;
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/* didn't change +h umode, we don't need to do anything */
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if (!((data->oldumodes ^ source_p->umodes) & user_modes['h']))
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return;
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if (source_p->umodes & user_modes['h'])
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{
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if (IsIPSpoof(source_p) || source_p->localClient->mangledhost == NULL || (IsDynSpoof(source_p) && strcmp(source_p->host, source_p->localClient->mangledhost)))
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{
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source_p->umodes &= ~user_modes['h'];
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return;
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}
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if (strcmp(source_p->host, source_p->localClient->mangledhost))
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{
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rb_strlcpy(source_p->host, source_p->localClient->mangledhost, HOSTLEN);
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distribute_hostchange(source_p);
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}
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else /* not really nice, but we need to send this numeric here */
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sendto_one_numeric(source_p, RPL_HOSTHIDDEN, "%s :is now your hidden host",
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source_p->host);
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}
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else if (!(source_p->umodes & user_modes['h']))
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{
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if (source_p->localClient->mangledhost != NULL &&
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!strcmp(source_p->host, source_p->localClient->mangledhost))
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{
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rb_strlcpy(source_p->host, source_p->orighost, HOSTLEN);
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distribute_hostchange(source_p);
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}
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}
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}
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static void
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check_new_user(void *vdata)
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{
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struct Client *source_p = (void *)vdata;
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if (IsIPSpoof(source_p))
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{
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source_p->umodes &= ~user_modes['h'];
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return;
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}
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source_p->localClient->mangledhost = rb_malloc(HOSTLEN);
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if (!irccmp(source_p->orighost, source_p->sockhost))
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do_host_cloak_ip(source_p->orighost, source_p->localClient->mangledhost);
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else
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do_host_cloak_host(source_p->orighost, source_p->localClient->mangledhost);
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if (IsDynSpoof(source_p))
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source_p->umodes &= ~user_modes['h'];
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if (source_p->umodes & user_modes['h'])
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{
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rb_strlcpy(source_p->host, source_p->localClient->mangledhost, sizeof(source_p->host));
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if (irccmp(source_p->host, source_p->orighost))
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SetDynSpoof(source_p);
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}
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}
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