mirror of
https://github.com/matrix-construct/construct
synced 2024-08-23 18:14:46 +02:00
This is cleaner. Note this was broken out of a much larger piece of work I did, so if there's any problems, I apologise!
175 lines
4.7 KiB
C
175 lines
4.7 KiB
C
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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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static const char ip_cloaking_desc[] = "Very old IP cloaking mechanism";
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/* if you're modifying this module, you'll probably want 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_AV2(ip_cloaking, _modinit, _moddeinit, NULL, NULL,
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ip_cloaking_hfnlist, NULL, NULL, ip_cloaking_desc);
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static void
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distribute_hostchange(struct Client *client_p, char *newhost)
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{
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if (newhost != client_p->orighost)
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sendto_one_numeric(client_p, RPL_HOSTHIDDEN, "%s :is now your hidden host",
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newhost);
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else
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sendto_one_numeric(client_p, RPL_HOSTHIDDEN, "%s :hostname reset",
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newhost);
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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_p), newhost);
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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_p), newhost);
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change_nick_user_host(client_p, client_p->name, client_p->username, newhost, 0, "Changing host");
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if (newhost != client_p->orighost)
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SetDynSpoof(client_p);
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else
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ClearDynSpoof(client_p);
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}
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static void
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do_host_cloak(const char *inbuf, char *outbuf, int ipmask)
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{
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unsigned int cyc;
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unsigned int hosthash = 1, hosthash2 = 1;
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unsigned int maxcycle = strlen(inbuf);
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int len1;
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const char *rest, *next;
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for (cyc = 0; cyc < maxcycle - 2; cyc += 2)
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hosthash *= (unsigned int) inbuf[cyc];
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/* safety: decrement ourselves two steps back */
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for (cyc = maxcycle - 1; cyc >= 1; cyc -= 2)
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hosthash2 *= (unsigned int) inbuf[cyc];
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/* lets do some bitshifting -- this pretty much destroys the IP
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* sequence, while still providing a checksum. exactly what
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* we're shooting for. --nenolod
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*/
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hosthash += (hosthash2 / KEY);
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hosthash2 += (hosthash / KEY);
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if (ipmask == 0)
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{
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snprintf(outbuf, HOSTLEN, "%s-%X%X",
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ServerInfo.network_name, hosthash2, hosthash);
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len1 = strlen(outbuf);
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rest = strchr(inbuf, '.');
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if (rest == NULL)
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rest = ".";
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/* try to avoid truncation -- jilles */
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while (len1 + strlen(rest) >= HOSTLEN && (next = strchr(rest + 1, '.')) != NULL)
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rest = next;
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rb_strlcat(outbuf, rest, HOSTLEN);
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}
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else
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snprintf(outbuf, HOSTLEN, "%X%X.%s",
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hosthash2, hosthash, ServerInfo.network_name);
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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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distribute_hostchange(source_p, source_p->localClient->mangledhost);
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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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distribute_hostchange(source_p, source_p->orighost);
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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(source_p->orighost, source_p->localClient->mangledhost, 1);
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else
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do_host_cloak(source_p->orighost, source_p->localClient->mangledhost, 0);
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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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