[solanum.git] / ircd / dns.c

/*
 *  dns.c: An interface to the resolver module in authd
 *  (based somewhat on ircd-ratbox dns.c)
 *
 *  Copyright (C) 2005 Aaron Sethman <androsyn@ratbox.org>
 *  Copyright (C) 2005-2012 ircd-ratbox development team
 *  Copyright (C) 2016 William Pitcock <nenolod@dereferenced.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
 *  USA
 */

#include <stdinc.h>
#include <ratbox_lib.h>
#include <struct.h>
#include <ircd_defs.h>
#include <parse.h>
#include <dns.h>
#include <match.h>
#include <logger.h>
#include <s_conf.h>
#include <client.h>
#include <send.h>
#include <numeric.h>
#include <msg.h>

#define DNS_IDTABLE_SIZE 0x2000

#define DNS_HOST	((char)'H')
#define DNS_REVERSE	((char)'I')

static void submit_dns(const char, uint16_t id, int aftype, const char *addr);

struct dnsreq
{
	DNSCB callback;
	void *data;
};

static struct dnsreq querytable[DNS_IDTABLE_SIZE];

static uint16_t
assign_dns_id(void)
{
	static uint16_t id = 1;
	int loopcnt = 0;
	while(1)
	{
		if(++loopcnt > DNS_IDTABLE_SIZE)
			return 0;
		if(id < DNS_IDTABLE_SIZE - 1 || id == 0)
			id++;
		else
			id = 1;
		if(querytable[id].callback == NULL)
			break;
	}
	return (id);
}

static void
handle_dns_failure(uint16_t xid)
{
	struct dnsreq *req;

	req = &querytable[xid];
	if(req->callback == NULL)
		return;

	req->callback("FAILED", 0, 0, req->data);
	req->callback = NULL;
	req->data = NULL;
}

void
cancel_lookup(uint16_t xid)
{
	querytable[xid].callback = NULL;
	querytable[xid].data = NULL;
}

uint16_t
lookup_hostname(const char *hostname, int aftype, DNSCB callback, void *data)
{
	struct dnsreq *req;
	int aft;
	uint16_t nid;
	check_authd();
	nid = assign_dns_id();
	if((nid = assign_dns_id()) == 0)
		return 0;

	req = &querytable[nid];

	req->callback = callback;
	req->data = data;

#ifdef RB_IPV6
	if(aftype == AF_INET6)
		aft = 6;
	else
#endif
		aft = 4;

	submit_dns(DNS_HOST, nid, aft, hostname);
	return (nid);
}

uint16_t
lookup_ip(const char *addr, int aftype, DNSCB callback, void *data)
{
	struct dnsreq *req;
	int aft;
	uint16_t nid;
	check_authd();

	if((nid = assign_dns_id()) == 0)
		return 0;
		
	req = &querytable[nid];

	req->callback = callback;
	req->data = data;

#ifdef RB_IPV6
	if(aftype == AF_INET6)
		aft = 6;
	else
#endif
		aft = 4;

	submit_dns(DNS_REVERSE, nid, aft, addr);
	return (nid);
}

void
dns_results_callback(const char *callid, const char *status, const char *aftype, const char *results)
{
	struct dnsreq *req;
	uint16_t nid;
	int st;
	int aft;
	long lnid = strtol(callid, NULL, 16);

	if(lnid > DNS_IDTABLE_SIZE || lnid == 0)
		return;
	nid = (uint16_t)lnid;
	req = &querytable[nid];
	st = atoi(status);
	aft = atoi(aftype);
	if(req->callback == NULL)
	{
		/* got cancelled..oh well */
		req->data = NULL;
		return;
	}
#ifdef RB_IPV6
	if(aft == 6)
		aft = AF_INET6;
	else
#endif
		aft = AF_INET;

	req->callback(results, st, aft, req->data);
	req->callback = NULL;
	req->data = NULL;
}

void
report_dns_servers(struct Client *source_p)
{
#if 0
	rb_dlink_node *ptr;
	RB_DLINK_FOREACH(ptr, nameservers.head)
	{
		sendto_one_numeric(source_p, RPL_STATSDEBUG, "A %s", (char *)ptr->data);
	}
#endif
}

static void
submit_dns(char type, uint16_t nid, int aftype, const char *addr)
{
	if(authd_helper == NULL)
	{
		handle_dns_failure(nid);
		return;
	}
	rb_helper_write(authd_helper, "%c %x %d %s", type, nid, aftype, addr);
}
Commit	Line	Data
7d2852b4 AC	1	/*
	2	* dns.c: An interface to the resolver module in authd
	3	* (based somewhat on ircd-ratbox dns.c)
	4	*
	5	* Copyright (C) 2005 Aaron Sethman <androsyn@ratbox.org>
	6	* Copyright (C) 2005-2012 ircd-ratbox development team
	7	* Copyright (C) 2016 William Pitcock <nenolod@dereferenced.org>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
	22	* USA
	23	*/
	24
	25	#include <stdinc.h>
	26	#include <ratbox_lib.h>
	27	#include <struct.h>
	28	#include <ircd_defs.h>
	29	#include <parse.h>
	30	#include <dns.h>
	31	#include <match.h>
	32	#include <logger.h>
	33	#include <s_conf.h>
	34	#include <client.h>
	35	#include <send.h>
	36	#include <numeric.h>
	37	#include <msg.h>
	38
	39	#define DNS_IDTABLE_SIZE 0x2000
	40
	41	#define DNS_HOST ((char)'H')
	42	#define DNS_REVERSE ((char)'I')
	43
	44	static void submit_dns(const char, uint16_t id, int aftype, const char *addr);
	45
7d2852b4 AC	46	struct dnsreq
	47	{
	48	DNSCB callback;
	49	void *data;
	50	};
	51
	52	static struct dnsreq querytable[DNS_IDTABLE_SIZE];
	53
	54	static uint16_t
	55	assign_dns_id(void)
	56	{
	57	static uint16_t id = 1;
	58	int loopcnt = 0;
	59	while(1)
	60	{
	61	if(++loopcnt > DNS_IDTABLE_SIZE)
	62	return 0;
	63	if(id < DNS_IDTABLE_SIZE - 1 \|\| id == 0)
	64	id++;
	65	else
	66	id = 1;
	67	if(querytable[id].callback == NULL)
	68	break;
	69	}
	70	return (id);
	71	}
	72
7d2852b4 AC	73	static void
	74	handle_dns_failure(uint16_t xid)
	75	{
	76	struct dnsreq *req;
	77
	78	req = &querytable[xid];
	79	if(req->callback == NULL)
	80	return;
	81
	82	req->callback("FAILED", 0, 0, req->data);
	83	req->callback = NULL;
	84	req->data = NULL;
	85	}
	86
	87	void
	88	cancel_lookup(uint16_t xid)
	89	{
	90	querytable[xid].callback = NULL;
	91	querytable[xid].data = NULL;
	92	}
	93
	94	uint16_t
	95	lookup_hostname(const char hostname, int aftype, DNSCB callback, void data)
	96	{
	97	struct dnsreq *req;
	98	int aft;
	99	uint16_t nid;
	100	check_authd();
	101	nid = assign_dns_id();
	102	if((nid = assign_dns_id()) == 0)
	103	return 0;
	104
	105	req = &querytable[nid];
	106
	107	req->callback = callback;
	108	req->data = data;
	109
	110	#ifdef RB_IPV6
	111	if(aftype == AF_INET6)
	112	aft = 6;
	113	else
	114	#endif
	115	aft = 4;
	116
	117	submit_dns(DNS_HOST, nid, aft, hostname);
	118	return (nid);
	119	}
	120
	121	uint16_t
	122	lookup_ip(const char addr, int aftype, DNSCB callback, void data)
	123	{
	124	struct dnsreq *req;
	125	int aft;
	126	uint16_t nid;
	127	check_authd();
	128
	129	if((nid = assign_dns_id()) == 0)
	130	return 0;
	131
	132	req = &querytable[nid];
	133
	134	req->callback = callback;
	135	req->data = data;
	136
137	#ifdef RB_IPV6
138	if(aftype == AF_INET6)
139	aft = 6;
140	else
141	#endif
142	aft = 4;
143
144	submit_dns(DNS_REVERSE, nid, aft, addr);
145	return (nid);
146	}
147
fb7d74ef AC	148	void
fb7d74ef AC	149	dns_results_callback(const char callid, const char status, const char aftype, const char results)
7d2852b4 AC	150	{
	151	struct dnsreq *req;
	152	uint16_t nid;
	153	int st;
	154	int aft;
	155	long lnid = strtol(callid, NULL, 16);
	156
	157	if(lnid > DNS_IDTABLE_SIZE \|\| lnid == 0)
	158	return;
	159	nid = (uint16_t)lnid;
	160	req = &querytable[nid];
	161	st = atoi(status);
	162	aft = atoi(aftype);
	163	if(req->callback == NULL)
	164	{
	165	/* got cancelled..oh well */
	166	req->data = NULL;
	167	return;
	168	}
	169	#ifdef RB_IPV6
	170	if(aft == 6)
	171	aft = AF_INET6;
	172	else
	173	#endif
	174	aft = AF_INET;
	175
	176	req->callback(results, st, aft, req->data);
	177	req->callback = NULL;
	178	req->data = NULL;
	179	}
	180
7d2852b4 AC	181	void
	182	report_dns_servers(struct Client *source_p)
	183	{
	184	#if 0
	185	rb_dlink_node *ptr;
	186	RB_DLINK_FOREACH(ptr, nameservers.head)
	187	{
	188	sendto_one_numeric(source_p, RPL_STATSDEBUG, "A %s", (char *)ptr->data);
	189	}
	190	#endif
	191	}
	192
7d2852b4 AC	193	static void
	194	submit_dns(char type, uint16_t nid, int aftype, const char *addr)
	195	{
	196	if(authd_helper == NULL)
	197	{
	198	handle_dns_failure(nid);
	199	return;
	200	}
	201	rb_helper_write(authd_helper, "%c %x %d %s", type, nid, aftype, addr);
	202	}