elemental-ircd/modules/m_chghost.c

248 lines
6.3 KiB
C

/*
* Copyright (c) 2005 William Pitcock <nenolod -at- nenolod.net>
* and Jilles Tjoelker <jilles -at- stack.nl>
* All rights reserved.
*
* Redistribution in both source and binary forms are permitted
* provided that the above copyright notice remains unchanged.
*
* m_chghost.c: A module for handling spoofing dynamically.
*/
#include "stdinc.h"
#include "send.h"
#include "channel.h"
#include "client.h"
#include "common.h"
#include "config.h"
#include "ircd.h"
#include "numeric.h"
#include "s_conf.h"
#include "s_newconf.h"
#include "s_serv.h"
#include "s_user.h"
#include "hash.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
#include "sprintf_irc.h"
#include "whowas.h"
#include "monitor.h"
static int me_realhost(struct Client *, struct Client *, int, const char **);
static int ms_chghost(struct Client *, struct Client *, int, const char **);
static int me_chghost(struct Client *, struct Client *, int, const char **);
static int mo_chghost(struct Client *, struct Client *, int, const char **);
struct Message realhost_msgtab = {
"REALHOST", 0, 0, 0, MFLG_SLOW,
{mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_realhost, 2}, mg_ignore}
};
struct Message chghost_msgtab = {
"CHGHOST", 0, 0, 0, MFLG_SLOW,
{mg_ignore, mg_not_oper, {ms_chghost, 3}, {ms_chghost, 3}, {me_chghost, 3}, {mo_chghost, 3}}
};
mapi_clist_av1 chghost_clist[] = { &chghost_msgtab, &realhost_msgtab, NULL };
DECLARE_MODULE_AV1(chghost, NULL, NULL, chghost_clist, NULL, NULL, "$Revision: 3424 $");
/* clean_host()
*
* input - host to check
* output - 0 if erroneous, else 0
* side effects -
*/
static int
clean_host(const char *host)
{
int len = 0;
if (*host == '\0' || *host == ':')
return 0;
for(; *host; host++)
{
len++;
if(!IsHostChar(*host))
return 0;
}
if(len > HOSTLEN)
return 0;
return 1;
}
/*
* me_realhost
* parv[0] = origin
* parv[1] = real host
*
* Yes this contains a little race condition if someone does a whois
* in between the UID and REALHOST and use_whois_actually is enabled.
* I don't think that's a big problem as the whole thing is a
* race condition.
*/
static int
me_realhost(struct Client *client_p, struct Client *source_p,
int parc, const char *parv[])
{
if (!IsPerson(source_p))
return 0;
del_from_hostname_hash(source_p->orighost, source_p);
strlcpy(source_p->orighost, parv[1], sizeof source_p->orighost);
if (irccmp(source_p->host, source_p->orighost))
SetDynSpoof(source_p);
else
ClearDynSpoof(source_p);
add_to_hostname_hash(source_p->orighost, source_p);
return 0;
}
static int
do_chghost(struct Client *source_p, struct Client *target_p,
const char *newhost, int is_encap)
{
if (!clean_host(newhost))
{
sendto_realops_snomask(SNO_GENERAL, is_encap ? L_ALL : L_NETWIDE, "%s attempted to change hostname for %s to %s (invalid)",
IsServer(source_p) ? source_p->name : get_oper_name(source_p),
target_p->name, newhost);
/* sending this remotely may disclose important
* routing information -- jilles */
if (is_encap ? MyClient(target_p) : !ConfigServerHide.flatten_links)
sendto_one_notice(target_p, ":*** Notice -- %s attempted to change your hostname to %s (invalid)",
source_p->name, newhost);
return 0;
}
change_nick_user_host(target_p, target_p->name, target_p->username, newhost, 0, "Changing host");
if (irccmp(target_p->host, target_p->orighost))
{
SetDynSpoof(target_p);
if (MyClient(target_p))
sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :is now your hidden host (set by %s)", target_p->host, source_p->name);
}
else
{
ClearDynSpoof(target_p);
if (MyClient(target_p))
sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :hostname reset by %s", target_p->host, source_p->name);
}
if (MyClient(source_p))
sendto_one_notice(source_p, ":Changed hostname for %s to %s", target_p->name, target_p->host);
if (!IsServer(source_p) && !IsService(source_p))
sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s changed hostname for %s to %s", get_oper_name(source_p), target_p->name, target_p->host);
return 1;
}
/*
* ms_chghost
* parv[0] = origin
* parv[1] = target
* parv[2] = host
*/
static int
ms_chghost(struct Client *client_p, struct Client *source_p,
int parc, const char *parv[])
{
struct Client *target_p;
if (!(target_p = find_person(parv[1])))
return -1;
if (do_chghost(source_p, target_p, parv[2], 0))
{
sendto_server(client_p, NULL,
CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s %s",
use_id(source_p), use_id(target_p), parv[2]);
sendto_server(client_p, NULL,
CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
use_id(source_p), use_id(target_p), parv[2]);
sendto_server(client_p, NULL,
NOCAPS, CAP_TS6, ":%s ENCAP * CHGHOST %s :%s",
source_p->name, target_p->name, parv[2]);
}
return 0;
}
/*
* me_chghost
* parv[0] = origin
* parv[1] = target
* parv[2] = host
*/
static int
me_chghost(struct Client *client_p, struct Client *source_p,
int parc, const char *parv[])
{
struct Client *target_p;
if (!(target_p = find_person(parv[1])))
return -1;
do_chghost(source_p, target_p, parv[2], 1);
return 0;
}
/*
* mo_chghost
* parv[0] = origin
* parv[1] = target
* parv[2] = host
*/
/* Disable this because of the abuse potential -- jilles
* No, make it toggleable via ./configure. --nenolod
*/
static int
mo_chghost(struct Client *client_p, struct Client *source_p,
int parc, const char *parv[])
{
#ifdef ENABLE_OPER_CHGHOST
struct Client *target_p;
if(!IsOperAdmin(source_p))
{
sendto_one(source_p, form_str(ERR_NOPRIVS),
me.name, source_p->name, "admin");
return 0;
}
if (!(target_p = find_named_person(parv[1])))
{
sendto_one_numeric(source_p, ERR_NOSUCHNICK,
form_str(ERR_NOSUCHNICK), parv[1]);
return 0;
}
if (!clean_host(parv[2]))
{
sendto_one_notice(source_p, ":Hostname %s is invalid", parv[2]);
return 0;
}
do_chghost(source_p, target_p, parv[2], 0);
sendto_server(NULL, NULL,
CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s %s",
use_id(source_p), use_id(target_p), parv[2]);
sendto_server(NULL, NULL,
CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
use_id(source_p), use_id(target_p), parv[2]);
sendto_server(NULL, NULL,
NOCAPS, CAP_TS6, ":%s ENCAP * CHGHOST %s :%s",
source_p->name, target_p->name, parv[2]);
#else
sendto_one_numeric(source_p, ERR_DISABLED, form_str(ERR_DISABLED),
"CHGHOST");
#endif
return 0;
}