solanum/extensions/ip_cloaking_old.c
Elizabeth Myers 04f832b778 Bump all extensions to AV2
Most do not yet have descriptions, but that's trivial.
2016-03-06 23:57:10 -06:00

172 lines
4.6 KiB
C

#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, NULL);
static void
distribute_hostchange(struct Client *client_p, char *newhost)
{
if (newhost != client_p->orighost)
sendto_one_numeric(client_p, RPL_HOSTHIDDEN, "%s :is now your hidden host",
newhost);
else
sendto_one_numeric(client_p, RPL_HOSTHIDDEN, "%s :hostname reset",
newhost);
sendto_server(NULL, NULL,
CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s :%s",
use_id(&me), use_id(client_p), newhost);
sendto_server(NULL, NULL,
CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
use_id(&me), use_id(client_p), newhost);
change_nick_user_host(client_p, client_p->name, client_p->username, newhost, 0, "Changing host");
if (newhost != client_p->orighost)
SetDynSpoof(client_p);
else
ClearDynSpoof(client_p);
}
static void
do_host_cloak(const char *inbuf, char *outbuf, int ipmask)
{
unsigned int cyc;
unsigned int hosthash = 1, hosthash2 = 1;
unsigned int maxcycle = strlen(inbuf);
int len1;
const char *rest, *next;
for (cyc = 0; cyc < maxcycle - 2; cyc += 2)
hosthash *= (unsigned int) inbuf[cyc];
/* safety: decrement ourselves two steps back */
for (cyc = maxcycle - 1; cyc >= 1; cyc -= 2)
hosthash2 *= (unsigned int) inbuf[cyc];
/* lets do some bitshifting -- this pretty much destroys the IP
* sequence, while still providing a checksum. exactly what
* we're shooting for. --nenolod
*/
hosthash += (hosthash2 / KEY);
hosthash2 += (hosthash / KEY);
if (ipmask == 0)
{
snprintf(outbuf, HOSTLEN, "%s-%X%X",
ServerInfo.network_name, hosthash2, hosthash);
len1 = strlen(outbuf);
rest = strchr(inbuf, '.');
if (rest == NULL)
rest = ".";
/* try to avoid truncation -- jilles */
while (len1 + strlen(rest) >= HOSTLEN && (next = strchr(rest + 1, '.')) != NULL)
rest = next;
rb_strlcat(outbuf, rest, HOSTLEN);
}
else
snprintf(outbuf, HOSTLEN, "%X%X.%s",
hosthash2, hosthash, ServerInfo.network_name);
}
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))
{
distribute_hostchange(source_p, source_p->localClient->mangledhost);
}
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))
{
distribute_hostchange(source_p, source_p->orighost);
}
}
}
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(source_p->orighost, source_p->localClient->mangledhost, 1);
else
do_host_cloak(source_p->orighost, source_p->localClient->mangledhost, 0);
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);
}
}