[solanum.git] / extensions / override.c

/*
 * oper-override for solanum.
 *
 * adds usermode +p and has a timer event that is iterated over to disable
 * usermode +p after a while...
 *
 * you need to have oper:override permission on the opers you want to be
 * able to use this extension.
 */

#include "stdinc.h"
#include "modules.h"
#include "hook.h"
#include "client.h"
#include "ircd.h"
#include "send.h"
#include "hash.h"
#include "s_conf.h"
#include "s_user.h"
#include "s_serv.h"
#include "numeric.h"
#include "privilege.h"
#include "s_newconf.h"

static const char override_desc[] =
	"Adds user mode +p, an operator-only user mode that grants temporary privileges to override anything";

static void check_umode_change(void *data);
static void hack_channel_access(void *data);
static void hack_can_join(void *data);
static void hack_can_kick(void *data);
static void hack_can_send(void *data);
static void handle_client_exit(void *data);

mapi_hfn_list_av1 override_hfnlist[] = {
	{ "umode_changed", (hookfn) check_umode_change },
	{ "get_channel_access", (hookfn) hack_channel_access, HOOK_HIGHEST },
	{ "can_join", (hookfn) hack_can_join, HOOK_HIGHEST },
	{ "can_kick", (hookfn) hack_can_kick, HOOK_HIGHEST },
	{ "can_send", (hookfn) hack_can_send, HOOK_HIGHEST },
	{ "client_exit", (hookfn) handle_client_exit },
	{ NULL, NULL }
};

#define CHFL_OVERRIDE		0x0004
#define IsOperOverride(x)	(HasPrivilege((x), "oper:override"))

struct OverrideSession {
	rb_dlink_node node;

	struct Client *client;
	time_t deadline;
};

rb_dlink_list overriding_opers = { NULL, NULL, 0 };

static void
update_session_deadline(struct Client *source_p, struct OverrideSession *session_p)
{
	if (session_p == NULL)
	{
		rb_dlink_node *n;

		RB_DLINK_FOREACH(n, overriding_opers.head)
		{
			struct OverrideSession *s = n->data;

			if (s->client == source_p)
			{
				session_p = s;
				break;
			}
		}
	}

	if (session_p == NULL)
	{
		session_p = rb_malloc(sizeof(struct OverrideSession));
		session_p->client = source_p;
	}

	session_p->deadline = rb_current_time() + 1800;

	rb_dlinkDelete(&session_p->node, &overriding_opers);
	rb_dlinkAdd(session_p, &session_p->node, &overriding_opers);
}

static void
expire_override_deadlines(void *unused)
{
	rb_dlink_node *n, *tn;

	RB_DLINK_FOREACH_SAFE(n, tn, overriding_opers.head)
	{
		struct OverrideSession *session_p = n->data;

		if (session_p->deadline > rb_current_time())
			break;
		else if (session_p->deadline < rb_current_time())
		{
			const char *parv[4] = {session_p->client->name, session_p->client->name, "-p", NULL};
			user_mode(session_p->client, session_p->client, 3, parv);
		}
	}
}

static void
check_umode_change(void *vdata)
{
	hook_data_umode_changed *data = (hook_data_umode_changed *)vdata;
	bool changed = false;
	struct Client *source_p = data->client;

	if (!MyClient(source_p))
		return;

	if (data->oldumodes & UMODE_OPER && !IsOper(source_p))
		source_p->umodes &= ~user_modes['p'];

	changed = ((data->oldumodes ^ source_p->umodes) & user_modes['p']);

	if (source_p->umodes & user_modes['p'])
	{
		if (!IsOperOverride(source_p))
		{
			sendto_one_notice(source_p, ":*** You need oper:override privilege for +p");
			source_p->umodes &= ~user_modes['p'];
			return;
		}

		if (changed)
		{
			update_session_deadline(source_p, NULL);
		}
	}
	else if (changed && !(source_p->umodes & user_modes['p']))
	{
		rb_dlink_node *n, *tn;

		RB_DLINK_FOREACH_SAFE(n, tn, overriding_opers.head)
		{
			struct OverrideSession *session_p = n->data;

			if (session_p->client != source_p)
				continue;

			rb_dlinkDelete(n, &overriding_opers);
			rb_free(session_p);
		}
	}
}

static void
hack_channel_access(void *vdata)
{
	hook_data_channel_approval *data = (hook_data_channel_approval *) vdata;

	if (data->dir == MODE_QUERY)
		return;

	if (data->approved == CHFL_CHANOP)
		return;

	if (data->client->umodes & user_modes['p'])
	{
		update_session_deadline(data->client, NULL);
		data->approved = CHFL_OVERRIDE;

		/* we only want to report modehacks, which are always non-NULL */
		if (data->modestr)
			sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (modehacking: %s)",
					       get_oper_name(data->client), data->chptr->chname, data->modestr);
	}
}

static void
hack_can_join(void *vdata)
{
	hook_data_channel *data = (hook_data_channel *) vdata;

	if (data->approved == 0)
		return;

	if (data->client->umodes & user_modes['p'])
	{
		update_session_deadline(data->client, NULL);
		data->approved = 0;

		sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (banwalking)",
				       get_oper_name(data->client), data->chptr->chname);
	}
}

static void
hack_can_kick(void *vdata)
{
	hook_data_channel_approval *data = (hook_data_channel_approval *) vdata;
	int alevel;

	alevel = get_channel_access(data->client, data->chptr, data->msptr, data->dir, NULL);
	if (alevel != CHFL_OVERRIDE)
		return;

	if (data->client->umodes & user_modes['p'])
	{
		update_session_deadline(data->client, NULL);
		sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (KICK %s)",
				       get_oper_name(data->client), data->chptr->chname, data->target->name);
	}
}

static void
hack_can_send(void *vdata)
{
	hook_data_channel_approval *data = (hook_data_channel_approval *) vdata;

	if (data->dir == MODE_QUERY)
		return;

	if (data->approved == CAN_SEND_NONOP || data->approved == CAN_SEND_OPV)
		return;

	if (data->client->umodes & user_modes['p'])
	{
		data->approved = CAN_SEND_NONOP;

		if (MyClient(data->client))
		{
			update_session_deadline(data->client, NULL);
			sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (forcing message)",
					       get_oper_name(data->client), data->chptr->chname);
		}
	}
}

static void
handle_client_exit(void *vdata)
{
	hook_data_client_exit *data = (hook_data_client_exit *) vdata;
	rb_dlink_node *n, *tn;
	struct Client *source_p = data->target;

	RB_DLINK_FOREACH_SAFE(n, tn, overriding_opers.head)
	{
		struct OverrideSession *session_p = n->data;

		if (session_p->client != source_p)
			continue;

		rb_dlinkDelete(n, &overriding_opers);
		rb_free(session_p);
	}
}

struct ev_entry *expire_override_deadlines_ev = NULL;

static int
_modinit(void)
{
	rb_dlink_node *ptr;

	/* add the usermode to the available slot */
	user_modes['p'] = find_umode_slot();
	construct_umodebuf();

	RB_DLINK_FOREACH(ptr, lclient_list.head)
	{
		struct Client *client_p = ptr->data;
		if (IsPerson(client_p) && (client_p->umodes & user_modes['p']))
			update_session_deadline(client_p, NULL);
	}

	expire_override_deadlines_ev = rb_event_add("expire_override_deadlines", expire_override_deadlines, NULL, 60);

	return 0;
}

static void
_moddeinit(void)
{
	rb_dlink_node *n, *tn;

	/* disable the umode and remove it from the available list */
	user_modes['p'] = 0;
	construct_umodebuf();

	RB_DLINK_FOREACH_SAFE(n, tn, overriding_opers.head)
	{
		rb_dlinkDelete(n, &overriding_opers);
		rb_free(n->data);
	}

	rb_event_delete(expire_override_deadlines_ev);
}

DECLARE_MODULE_AV2(override, _modinit, _moddeinit, NULL, NULL,
			override_hfnlist, NULL, NULL, override_desc);
Commit	Line	Data
429cf1b7	1	/*
a6f63a82	2	* oper-override for solanum.
429cf1b7 AC	3	*
	4	* adds usermode +p and has a timer event that is iterated over to disable
	5	* usermode +p after a while...
	6	*
	7	* you need to have oper:override permission on the opers you want to be
	8	* able to use this extension.
	9	*/
	10
	11	#include "stdinc.h"
	12	#include "modules.h"
	13	#include "hook.h"
	14	#include "client.h"
	15	#include "ircd.h"
	16	#include "send.h"
	17	#include "hash.h"
	18	#include "s_conf.h"
	19	#include "s_user.h"
	20	#include "s_serv.h"
	21	#include "numeric.h"
	22	#include "privilege.h"
	23	#include "s_newconf.h"
	24
3fd3d7e1 EM	25	static const char override_desc[] =
	26	"Adds user mode +p, an operator-only user mode that grants temporary privileges to override anything";
	27
429cf1b7 AC	28	static void check_umode_change(void *data);
429cf1b7 AC	29	static void hack_channel_access(void *data);
d3076881	30	static void hack_can_join(void *data);
f69d7feb	31	static void hack_can_kick(void *data);
9101dbcd	32	static void hack_can_send(void *data);
5c3014d0	33	static void handle_client_exit(void *data);
429cf1b7 AC	34
	35	mapi_hfn_list_av1 override_hfnlist[] = {
	36	{ "umode_changed", (hookfn) check_umode_change },
c500b0bd EK	37	{ "get_channel_access", (hookfn) hack_channel_access, HOOK_HIGHEST },
	38	{ "can_join", (hookfn) hack_can_join, HOOK_HIGHEST },
	39	{ "can_kick", (hookfn) hack_can_kick, HOOK_HIGHEST },
	40	{ "can_send", (hookfn) hack_can_send, HOOK_HIGHEST },
5c3014d0	41	{ "client_exit", (hookfn) handle_client_exit },
429cf1b7 AC	42	{ NULL, NULL }
	43	};
	44
f69d7feb	45	#define CHFL_OVERRIDE 0x0004
429cf1b7 AC	46	#define IsOperOverride(x) (HasPrivilege((x), "oper:override"))
	47
	48	struct OverrideSession {
	49	rb_dlink_node node;
	50
	51	struct Client *client;
	52	time_t deadline;
	53	};
	54
	55	rb_dlink_list overriding_opers = { NULL, NULL, 0 };
	56
	57	static void
	58	update_session_deadline(struct Client source_p, struct OverrideSession session_p)
	59	{
	60	if (session_p == NULL)
	61	{
	62	rb_dlink_node *n;
	63
	64	RB_DLINK_FOREACH(n, overriding_opers.head)
	65	{
	66	struct OverrideSession *s = n->data;
	67
	68	if (s->client == source_p)
	69	{
	70	session_p = s;
	71	break;
	72	}
	73	}
	74	}
	75
	76	if (session_p == NULL)
	77	{
	78	session_p = rb_malloc(sizeof(struct OverrideSession));
	79	session_p->client = source_p;
	80	}
	81
	82	session_p->deadline = rb_current_time() + 1800;
	83
	84	rb_dlinkDelete(&session_p->node, &overriding_opers);
	85	rb_dlinkAdd(session_p, &session_p->node, &overriding_opers);
	86	}
	87
	88	static void
	89	expire_override_deadlines(void *unused)
	90	{
	91	rb_dlink_node n, tn;
	92
	93	RB_DLINK_FOREACH_SAFE(n, tn, overriding_opers.head)
	94	{
	95	struct OverrideSession *session_p = n->data;
	96
	97	if (session_p->deadline > rb_current_time())
	98	break;
	99	else if (session_p->deadline < rb_current_time())
	100	{
bd2c29f7	101	const char *parv[4] = {session_p->client->name, session_p->client->name, "-p", NULL};
429cf1b7 AC	102	user_mode(session_p->client, session_p->client, 3, parv);
	103	}
	104	}
	105	}
	106
	107	static void
	108	check_umode_change(void *vdata)
	109	{
	110	hook_data_umode_changed data = (hook_data_umode_changed )vdata;
dbeda234	111	bool changed = false;
429cf1b7 AC	112	struct Client *source_p = data->client;
	113
	114	if (!MyClient(source_p))
	115	return;
	116
e5c254d7 JT	117	if (data->oldumodes & UMODE_OPER && !IsOper(source_p))
	118	source_p->umodes &= ~user_modes['p'];
	119
dbeda234	120	changed = ((data->oldumodes ^ source_p->umodes) & user_modes['p']);
429cf1b7	121
429cf1b7 AC	122	if (source_p->umodes & user_modes['p'])
429cf1b7 AC	123	{
e5c254d7 JT	124	if (!IsOperOverride(source_p))
	125	{
	126	sendto_one_notice(source_p, ":*** You need oper:override privilege for +p");
	127	source_p->umodes &= ~user_modes['p'];
	128	return;
	129	}
	130
dbeda234 EK	131	if (changed)
	132	{
	133	update_session_deadline(source_p, NULL);
dbeda234	134	}
429cf1b7	135	}
dbeda234	136	else if (changed && !(source_p->umodes & user_modes['p']))
429cf1b7 AC	137	{
	138	rb_dlink_node n, tn;
	139
	140	RB_DLINK_FOREACH_SAFE(n, tn, overriding_opers.head)
	141	{
	142	struct OverrideSession *session_p = n->data;
	143
	144	if (session_p->client != source_p)
	145	continue;
	146
429cf1b7 AC	147	rb_dlinkDelete(n, &overriding_opers);
	148	rb_free(session_p);
	149	}
	150	}
	151	}
	152
	153	static void
	154	hack_channel_access(void *vdata)
	155	{
	156	hook_data_channel_approval data = (hook_data_channel_approval ) vdata;
	157
202d4966 AC	158	if (data->dir == MODE_QUERY)
	159	return;
	160
429cf1b7 AC	161	if (data->approved == CHFL_CHANOP)
	162	return;
	163
	164	if (data->client->umodes & user_modes['p'])
	165	{
	166	update_session_deadline(data->client, NULL);
f69d7feb	167	data->approved = CHFL_OVERRIDE;
429cf1b7	168
b870a5f8 AC	169	/* we only want to report modehacks, which are always non-NULL */
	170	if (data->modestr)
	171	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (modehacking: %s)",
	172	get_oper_name(data->client), data->chptr->chname, data->modestr);
429cf1b7 AC	173	}
	174	}
	175
d3076881 AC	176	static void
	177	hack_can_join(void *vdata)
	178	{
	179	hook_data_channel data = (hook_data_channel ) vdata;
	180
	181	if (data->approved == 0)
	182	return;
	183
	184	if (data->client->umodes & user_modes['p'])
	185	{
	186	update_session_deadline(data->client, NULL);
	187	data->approved = 0;
	188
	189	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (banwalking)",
	190	get_oper_name(data->client), data->chptr->chname);
	191	}
	192	}
	193
f69d7feb AC	194	static void
	195	hack_can_kick(void *vdata)
	196	{
	197	hook_data_channel_approval data = (hook_data_channel_approval ) vdata;
	198	int alevel;
	199
103a1bfd	200	alevel = get_channel_access(data->client, data->chptr, data->msptr, data->dir, NULL);
f69d7feb AC	201	if (alevel != CHFL_OVERRIDE)
	202	return;
	203
	204	if (data->client->umodes & user_modes['p'])
	205	{
	206	update_session_deadline(data->client, NULL);
	207	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (KICK %s)",
	208	get_oper_name(data->client), data->chptr->chname, data->target->name);
	209	}
	210	}
	211
9101dbcd AC	212	static void
	213	hack_can_send(void *vdata)
	214	{
	215	hook_data_channel_approval data = (hook_data_channel_approval ) vdata;
	216
202d4966 AC	217	if (data->dir == MODE_QUERY)
	218	return;
	219
9101dbcd AC	220	if (data->approved == CAN_SEND_NONOP \|\| data->approved == CAN_SEND_OPV)
	221	return;
	222
	223	if (data->client->umodes & user_modes['p'])
	224	{
0d165b52	225	data->approved = CAN_SEND_NONOP;
9101dbcd	226
b4cdedaa JT	227	if (MyClient(data->client))
	228	{
	229	update_session_deadline(data->client, NULL);
	230	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (forcing message)",
	231	get_oper_name(data->client), data->chptr->chname);
	232	}
9101dbcd AC	233	}
	234	}
	235
5c3014d0 AC	236	static void
	237	handle_client_exit(void *vdata)
	238	{
	239	hook_data_client_exit data = (hook_data_client_exit ) vdata;
	240	rb_dlink_node n, tn;
	241	struct Client *source_p = data->target;
	242
	243	RB_DLINK_FOREACH_SAFE(n, tn, overriding_opers.head)
	244	{
	245	struct OverrideSession *session_p = n->data;
	246
	247	if (session_p->client != source_p)
	248	continue;
	249
	250	rb_dlinkDelete(n, &overriding_opers);
	251	rb_free(session_p);
55abcbb2	252	}
5c3014d0 AC	253	}
5c3014d0 AC	254
429cf1b7 AC	255	struct ev_entry *expire_override_deadlines_ev = NULL;
	256
	257	static int
	258	_modinit(void)
	259	{
cc75db3f EK	260	rb_dlink_node *ptr;
cc75db3f EK	261
429cf1b7 AC	262	/* add the usermode to the available slot */
	263	user_modes['p'] = find_umode_slot();
	264	construct_umodebuf();
	265
cc75db3f EK	266	RB_DLINK_FOREACH(ptr, lclient_list.head)
	267	{
	268	struct Client *client_p = ptr->data;
	269	if (IsPerson(client_p) && (client_p->umodes & user_modes['p']))
	270	update_session_deadline(client_p, NULL);
	271	}
	272
bd2c29f7	273	expire_override_deadlines_ev = rb_event_add("expire_override_deadlines", expire_override_deadlines, NULL, 60);
429cf1b7 AC	274
	275	return 0;
	276	}
	277
	278	static void
	279	_moddeinit(void)
	280	{
6637a547 EK	281	rb_dlink_node n, tn;
6637a547 EK	282
429cf1b7 AC	283	/* disable the umode and remove it from the available list */
	284	user_modes['p'] = 0;
	285	construct_umodebuf();
	286
6637a547 EK	287	RB_DLINK_FOREACH_SAFE(n, tn, overriding_opers.head)
	288	{
	289	rb_dlinkDelete(n, &overriding_opers);
	290	rb_free(n->data);
	291	}
	292
429cf1b7 AC	293	rb_event_delete(expire_override_deadlines_ev);
	294	}
	295
3fd3d7e1 EM	296	DECLARE_MODULE_AV2(override, _modinit, _moddeinit, NULL, NULL,
3fd3d7e1 EM	297	override_hfnlist, NULL, NULL, override_desc);