Bonjour - Bonjour/Zerconf library

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Dirk-Willem van Gulik (NXP/mbed) / Mbed 2 deprecated Bonjour

Bonjour/Zerconf library

lwip/core/dns.c@5:8e53abda9900, 2010-08-14 (annotated)

Committer:: dirkx
Date:: Sat Aug 14 15:54:31 2010 +0000
Revision:: 5:8e53abda9900
Parent:: 0:355018f44c9f

Who changed what in which revision?

User	Revision	Line number	New contents of line
dirkx	0:355018f44c9f	1	/**
dirkx	0:355018f44c9f	2	* @file
dirkx	0:355018f44c9f	3	* DNS - host name to IP address resolver.
dirkx	0:355018f44c9f	4	*
dirkx	0:355018f44c9f	5	*/
dirkx	0:355018f44c9f	6
dirkx	0:355018f44c9f	7	/**
dirkx	0:355018f44c9f	8
dirkx	0:355018f44c9f	9	* This file implements a DNS host name to IP address resolver.
dirkx	0:355018f44c9f	10
dirkx	0:355018f44c9f	11	* Port to lwIP from uIP
dirkx	0:355018f44c9f	12	* by Jim Pettinato April 2007
dirkx	0:355018f44c9f	13
dirkx	0:355018f44c9f	14	* uIP version Copyright (c) 2002-2003, Adam Dunkels.
dirkx	0:355018f44c9f	15	* All rights reserved.
dirkx	0:355018f44c9f	16	*
dirkx	0:355018f44c9f	17	* Redistribution and use in source and binary forms, with or without
dirkx	0:355018f44c9f	18	* modification, are permitted provided that the following conditions
dirkx	0:355018f44c9f	19	* are met:
dirkx	0:355018f44c9f	20	* 1. Redistributions of source code must retain the above copyright
dirkx	0:355018f44c9f	21	* notice, this list of conditions and the following disclaimer.
dirkx	0:355018f44c9f	22	* 2. Redistributions in binary form must reproduce the above copyright
dirkx	0:355018f44c9f	23	* notice, this list of conditions and the following disclaimer in the
dirkx	0:355018f44c9f	24	* documentation and/or other materials provided with the distribution.
dirkx	0:355018f44c9f	25	* 3. The name of the author may not be used to endorse or promote
dirkx	0:355018f44c9f	26	* products derived from this software without specific prior
dirkx	0:355018f44c9f	27	* written permission.
dirkx	0:355018f44c9f	28	*
dirkx	0:355018f44c9f	29	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
dirkx	0:355018f44c9f	30	* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
dirkx	0:355018f44c9f	31	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
dirkx	0:355018f44c9f	32	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
dirkx	0:355018f44c9f	33	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
dirkx	0:355018f44c9f	34	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
dirkx	0:355018f44c9f	35	* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
dirkx	0:355018f44c9f	36	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
dirkx	0:355018f44c9f	37	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
dirkx	0:355018f44c9f	38	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
dirkx	0:355018f44c9f	39	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
dirkx	0:355018f44c9f	40	*
dirkx	0:355018f44c9f	41	*
dirkx	0:355018f44c9f	42	* DNS.C
dirkx	0:355018f44c9f	43	*
dirkx	0:355018f44c9f	44	* The lwIP DNS resolver functions are used to lookup a host name and
dirkx	0:355018f44c9f	45	* map it to a numerical IP address. It maintains a list of resolved
dirkx	0:355018f44c9f	46	* hostnames that can be queried with the dns_lookup() function.
dirkx	0:355018f44c9f	47	* New hostnames can be resolved using the dns_query() function.
dirkx	0:355018f44c9f	48	*
dirkx	0:355018f44c9f	49	* The lwIP version of the resolver also adds a non-blocking version of
dirkx	0:355018f44c9f	50	* gethostbyname() that will work with a raw API application. This function
dirkx	0:355018f44c9f	51	* checks for an IP address string first and converts it if it is valid.
dirkx	0:355018f44c9f	52	* gethostbyname() then does a dns_lookup() to see if the name is
dirkx	0:355018f44c9f	53	* already in the table. If so, the IP is returned. If not, a query is
dirkx	0:355018f44c9f	54	* issued and the function returns with a ERR_INPROGRESS status. The app
dirkx	0:355018f44c9f	55	* using the dns client must then go into a waiting state.
dirkx	0:355018f44c9f	56	*
dirkx	0:355018f44c9f	57	* Once a hostname has been resolved (or found to be non-existent),
dirkx	0:355018f44c9f	58	* the resolver code calls a specified callback function (which
dirkx	0:355018f44c9f	59	* must be implemented by the module that uses the resolver).
dirkx	0:355018f44c9f	60	*/
dirkx	0:355018f44c9f	61
dirkx	0:355018f44c9f	62	/*-----------------------------------------------------------------------------
dirkx	0:355018f44c9f	63	* RFC 1035 - Domain names - implementation and specification
dirkx	0:355018f44c9f	64	* RFC 2181 - Clarifications to the DNS Specification
dirkx	0:355018f44c9f	65	----------------------------------------------------------------------------/
dirkx	0:355018f44c9f	66
dirkx	0:355018f44c9f	67	/** @todo: define good default values (rfc compliance) */
dirkx	0:355018f44c9f	68	/** @todo: improve answer parsing, more checkings... */
dirkx	0:355018f44c9f	69	/** @todo: check RFC1035 - 7.3. Processing responses */
dirkx	0:355018f44c9f	70
dirkx	0:355018f44c9f	71	/*-----------------------------------------------------------------------------
dirkx	0:355018f44c9f	72	* Includes
dirkx	0:355018f44c9f	73	----------------------------------------------------------------------------/
dirkx	0:355018f44c9f	74
dirkx	0:355018f44c9f	75	#include "lwip/opt.h"
dirkx	0:355018f44c9f	76
dirkx	0:355018f44c9f	77	#if LWIP_DNS /* don't build if not configured for use in lwipopts.h */
dirkx	0:355018f44c9f	78
dirkx	0:355018f44c9f	79	#include "lwip/udp.h"
dirkx	0:355018f44c9f	80	#include "lwip/mem.h"
dirkx	0:355018f44c9f	81	#include "lwip/memp.h"
dirkx	0:355018f44c9f	82	#include "lwip/dns.h"
dirkx	0:355018f44c9f	83	#include "lwip/debug.h"
dirkx	0:355018f44c9f	84
dirkx	0:355018f44c9f	85	#include <string.h>
dirkx	0:355018f44c9f	86
dirkx	0:355018f44c9f	87	/** DNS server IP address */
dirkx	0:355018f44c9f	88	#ifndef DNS_SERVER_ADDRESS
dirkx	0:355018f44c9f	89	#define DNS_SERVER_ADDRESS(ipaddr) (ip4_addr_set_u32(ipaddr, ipaddr_addr("208.67.222.222"))) /* resolver1.opendns.com */
dirkx	0:355018f44c9f	90	#endif
dirkx	0:355018f44c9f	91
dirkx	0:355018f44c9f	92	/** DNS server port address */
dirkx	0:355018f44c9f	93	#ifndef DNS_SERVER_PORT
dirkx	0:355018f44c9f	94	#define DNS_SERVER_PORT 53
dirkx	0:355018f44c9f	95	#endif
dirkx	0:355018f44c9f	96
dirkx	0:355018f44c9f	97	/** DNS maximum number of retries when asking for a name, before "timeout". */
dirkx	0:355018f44c9f	98	#ifndef DNS_MAX_RETRIES
dirkx	0:355018f44c9f	99	#define DNS_MAX_RETRIES 4
dirkx	0:355018f44c9f	100	#endif
dirkx	0:355018f44c9f	101
dirkx	0:355018f44c9f	102	/** DNS resource record max. TTL (one week as default) */
dirkx	0:355018f44c9f	103	#ifndef DNS_MAX_TTL
dirkx	0:355018f44c9f	104	#define DNS_MAX_TTL 604800
dirkx	0:355018f44c9f	105	#endif
dirkx	0:355018f44c9f	106
dirkx	0:355018f44c9f	107	/* DNS protocol flags */
dirkx	0:355018f44c9f	108	#define DNS_FLAG1_RESPONSE 0x80
dirkx	0:355018f44c9f	109	#define DNS_FLAG1_OPCODE_STATUS 0x10
dirkx	0:355018f44c9f	110	#define DNS_FLAG1_OPCODE_INVERSE 0x08
dirkx	0:355018f44c9f	111	#define DNS_FLAG1_OPCODE_STANDARD 0x00
dirkx	0:355018f44c9f	112	#define DNS_FLAG1_AUTHORATIVE 0x04
dirkx	0:355018f44c9f	113	#define DNS_FLAG1_TRUNC 0x02
dirkx	0:355018f44c9f	114	#define DNS_FLAG1_RD 0x01
dirkx	0:355018f44c9f	115	#define DNS_FLAG2_RA 0x80
dirkx	0:355018f44c9f	116	#define DNS_FLAG2_ERR_MASK 0x0f
dirkx	0:355018f44c9f	117	#define DNS_FLAG2_ERR_NONE 0x00
dirkx	0:355018f44c9f	118	#define DNS_FLAG2_ERR_NAME 0x03
dirkx	0:355018f44c9f	119
dirkx	0:355018f44c9f	120	/* DNS protocol states */
dirkx	0:355018f44c9f	121	#define DNS_STATE_UNUSED 0
dirkx	0:355018f44c9f	122	#define DNS_STATE_NEW 1
dirkx	0:355018f44c9f	123	#define DNS_STATE_ASKING 2
dirkx	0:355018f44c9f	124	#define DNS_STATE_DONE 3
dirkx	0:355018f44c9f	125
dirkx	0:355018f44c9f	126	#ifdef PACK_STRUCT_USE_INCLUDES
dirkx	0:355018f44c9f	127	# include "arch/bpstruct.h"
dirkx	0:355018f44c9f	128	#endif
dirkx	0:355018f44c9f	129	PACK_STRUCT_BEGIN
dirkx	0:355018f44c9f	130	/** DNS message header */
dirkx	0:355018f44c9f	131	struct dns_hdr {
dirkx	0:355018f44c9f	132	PACK_STRUCT_FIELD(u16_t id);
dirkx	0:355018f44c9f	133	PACK_STRUCT_FIELD(u8_t flags1);
dirkx	0:355018f44c9f	134	PACK_STRUCT_FIELD(u8_t flags2);
dirkx	0:355018f44c9f	135	PACK_STRUCT_FIELD(u16_t numquestions);
dirkx	0:355018f44c9f	136	PACK_STRUCT_FIELD(u16_t numanswers);
dirkx	0:355018f44c9f	137	PACK_STRUCT_FIELD(u16_t numauthrr);
dirkx	0:355018f44c9f	138	PACK_STRUCT_FIELD(u16_t numextrarr);
dirkx	0:355018f44c9f	139	} PACK_STRUCT_STRUCT;
dirkx	0:355018f44c9f	140	PACK_STRUCT_END
dirkx	0:355018f44c9f	141	#ifdef PACK_STRUCT_USE_INCLUDES
dirkx	0:355018f44c9f	142	# include "arch/epstruct.h"
dirkx	0:355018f44c9f	143	#endif
dirkx	0:355018f44c9f	144	#define SIZEOF_DNS_HDR 12
dirkx	0:355018f44c9f	145
dirkx	0:355018f44c9f	146	/** DNS query message structure.
dirkx	0:355018f44c9f	147	No packing needed: only used locally on the stack. */
dirkx	0:355018f44c9f	148	struct dns_query {
dirkx	0:355018f44c9f	149	/* DNS query record starts with either a domain name or a pointer
dirkx	0:355018f44c9f	150	to a name already present somewhere in the packet. */
dirkx	0:355018f44c9f	151	u16_t type;
dirkx	0:355018f44c9f	152	u16_t cls;
dirkx	0:355018f44c9f	153	};
dirkx	0:355018f44c9f	154	#define SIZEOF_DNS_QUERY 4
dirkx	0:355018f44c9f	155
dirkx	0:355018f44c9f	156	/** DNS answer message structure.
dirkx	0:355018f44c9f	157	No packing needed: only used locally on the stack. */
dirkx	0:355018f44c9f	158	struct dns_answer {
dirkx	0:355018f44c9f	159	/* DNS answer record starts with either a domain name or a pointer
dirkx	0:355018f44c9f	160	to a name already present somewhere in the packet. */
dirkx	0:355018f44c9f	161	u16_t type;
dirkx	0:355018f44c9f	162	u16_t cls;
dirkx	0:355018f44c9f	163	u32_t ttl;
dirkx	0:355018f44c9f	164	u16_t len;
dirkx	0:355018f44c9f	165	};
dirkx	0:355018f44c9f	166	#define SIZEOF_DNS_ANSWER 10
dirkx	0:355018f44c9f	167
dirkx	0:355018f44c9f	168	/** DNS table entry */
dirkx	0:355018f44c9f	169	struct dns_table_entry {
dirkx	0:355018f44c9f	170	u8_t state;
dirkx	0:355018f44c9f	171	u8_t numdns;
dirkx	0:355018f44c9f	172	u8_t tmr;
dirkx	0:355018f44c9f	173	u8_t retries;
dirkx	0:355018f44c9f	174	u8_t seqno;
dirkx	0:355018f44c9f	175	u8_t err;
dirkx	0:355018f44c9f	176	u32_t ttl;
dirkx	0:355018f44c9f	177	char name[DNS_MAX_NAME_LENGTH];
dirkx	0:355018f44c9f	178	ip_addr_t ipaddr;
dirkx	0:355018f44c9f	179	/* pointer to callback on DNS query done */
dirkx	0:355018f44c9f	180	dns_found_callback found;
dirkx	0:355018f44c9f	181	void *arg;
dirkx	0:355018f44c9f	182	};
dirkx	0:355018f44c9f	183
dirkx	0:355018f44c9f	184	#if DNS_LOCAL_HOSTLIST
dirkx	0:355018f44c9f	185
dirkx	0:355018f44c9f	186	#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
dirkx	0:355018f44c9f	187	/** Local host-list. For hostnames in this list, no
dirkx	0:355018f44c9f	188	* external name resolution is performed */
dirkx	0:355018f44c9f	189	static struct local_hostlist_entry *local_hostlist_dynamic;
dirkx	0:355018f44c9f	190	#else /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
dirkx	0:355018f44c9f	191
dirkx	0:355018f44c9f	192	/** Defining this allows the local_hostlist_static to be placed in a different
dirkx	0:355018f44c9f	193	* linker section (e.g. FLASH) */
dirkx	0:355018f44c9f	194	#ifndef DNS_LOCAL_HOSTLIST_STORAGE_PRE
dirkx	0:355018f44c9f	195	#define DNS_LOCAL_HOSTLIST_STORAGE_PRE static
dirkx	0:355018f44c9f	196	#endif /* DNS_LOCAL_HOSTLIST_STORAGE_PRE */
dirkx	0:355018f44c9f	197	/** Defining this allows the local_hostlist_static to be placed in a different
dirkx	0:355018f44c9f	198	* linker section (e.g. FLASH) */
dirkx	0:355018f44c9f	199	#ifndef DNS_LOCAL_HOSTLIST_STORAGE_POST
dirkx	0:355018f44c9f	200	#define DNS_LOCAL_HOSTLIST_STORAGE_POST
dirkx	0:355018f44c9f	201	#endif /* DNS_LOCAL_HOSTLIST_STORAGE_POST */
dirkx	0:355018f44c9f	202	DNS_LOCAL_HOSTLIST_STORAGE_PRE struct local_hostlist_entry local_hostlist_static[]
dirkx	0:355018f44c9f	203	DNS_LOCAL_HOSTLIST_STORAGE_POST = DNS_LOCAL_HOSTLIST_INIT;
dirkx	0:355018f44c9f	204
dirkx	0:355018f44c9f	205	#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
dirkx	0:355018f44c9f	206
dirkx	0:355018f44c9f	207	static void dns_init_local();
dirkx	0:355018f44c9f	208	#endif /* DNS_LOCAL_HOSTLIST */
dirkx	0:355018f44c9f	209
dirkx	0:355018f44c9f	210
dirkx	0:355018f44c9f	211	/* forward declarations */
dirkx	0:355018f44c9f	212	static void dns_recv(void s, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port);
dirkx	0:355018f44c9f	213	static void dns_check_entries(void);
dirkx	0:355018f44c9f	214
dirkx	0:355018f44c9f	215	/*-----------------------------------------------------------------------------
dirkx	0:355018f44c9f	216	* Globales
dirkx	0:355018f44c9f	217	----------------------------------------------------------------------------/
dirkx	0:355018f44c9f	218
dirkx	0:355018f44c9f	219	/* DNS variables */
dirkx	0:355018f44c9f	220	static struct udp_pcb *dns_pcb;
dirkx	0:355018f44c9f	221	static u8_t dns_seqno;
dirkx	0:355018f44c9f	222	static struct dns_table_entry dns_table[DNS_TABLE_SIZE];
dirkx	0:355018f44c9f	223	static ip_addr_t dns_servers[DNS_MAX_SERVERS];
dirkx	0:355018f44c9f	224	/** Contiguous buffer for processing responses */
dirkx	0:355018f44c9f	225	static u8_t dns_payload_buffer[LWIP_MEM_ALIGN_BUFFER(DNS_MSG_SIZE)];
dirkx	0:355018f44c9f	226	static u8_t* dns_payload;
dirkx	0:355018f44c9f	227
dirkx	0:355018f44c9f	228	/**
dirkx	0:355018f44c9f	229	* Initialize the resolver: set up the UDP pcb and configure the default server
dirkx	0:355018f44c9f	230	* (DNS_SERVER_ADDRESS).
dirkx	0:355018f44c9f	231	*/
dirkx	0:355018f44c9f	232	void
dirkx	0:355018f44c9f	233	dns_init()
dirkx	0:355018f44c9f	234	{
dirkx	0:355018f44c9f	235	ip_addr_t dnsserver;
dirkx	0:355018f44c9f	236
dirkx	0:355018f44c9f	237	dns_payload = (u8_t *)LWIP_MEM_ALIGN(dns_payload_buffer);
dirkx	0:355018f44c9f	238
dirkx	0:355018f44c9f	239	/* initialize default DNS server address */
dirkx	0:355018f44c9f	240	DNS_SERVER_ADDRESS(&dnsserver);
dirkx	0:355018f44c9f	241
dirkx	0:355018f44c9f	242	LWIP_DEBUGF(DNS_DEBUG, ("dns_init: initializing\n"));
dirkx	0:355018f44c9f	243
dirkx	0:355018f44c9f	244	/* if dns client not yet initialized... */
dirkx	0:355018f44c9f	245	if (dns_pcb == NULL) {
dirkx	0:355018f44c9f	246	dns_pcb = udp_new();
dirkx	0:355018f44c9f	247
dirkx	0:355018f44c9f	248	if (dns_pcb != NULL) {
dirkx	0:355018f44c9f	249	/* initialize DNS table not needed (initialized to zero since it is a
dirkx	0:355018f44c9f	250	* global variable) */
dirkx	0:355018f44c9f	251	LWIP_ASSERT("For implicit initialization to work, DNS_STATE_UNUSED needs to be 0",
dirkx	0:355018f44c9f	252	DNS_STATE_UNUSED == 0);
dirkx	0:355018f44c9f	253
dirkx	0:355018f44c9f	254	/* initialize DNS client */
dirkx	0:355018f44c9f	255	udp_bind(dns_pcb, IP_ADDR_ANY, 0);
dirkx	0:355018f44c9f	256	udp_recv(dns_pcb, dns_recv, NULL);
dirkx	0:355018f44c9f	257
dirkx	0:355018f44c9f	258	/* initialize default DNS primary server */
dirkx	0:355018f44c9f	259	dns_setserver(0, &dnsserver);
dirkx	0:355018f44c9f	260	}
dirkx	0:355018f44c9f	261	}
dirkx	0:355018f44c9f	262	#if DNS_LOCAL_HOSTLIST
dirkx	0:355018f44c9f	263	dns_init_local();
dirkx	0:355018f44c9f	264	#endif
dirkx	0:355018f44c9f	265	}
dirkx	0:355018f44c9f	266
dirkx	0:355018f44c9f	267	/**
dirkx	0:355018f44c9f	268	* Initialize one of the DNS servers.
dirkx	0:355018f44c9f	269	*
dirkx	0:355018f44c9f	270	* @param numdns the index of the DNS server to set must be < DNS_MAX_SERVERS
dirkx	0:355018f44c9f	271	* @param dnsserver IP address of the DNS server to set
dirkx	0:355018f44c9f	272	*/
dirkx	0:355018f44c9f	273	void
dirkx	0:355018f44c9f	274	dns_setserver(u8_t numdns, ip_addr_t *dnsserver)
dirkx	0:355018f44c9f	275	{
dirkx	0:355018f44c9f	276	if ((numdns < DNS_MAX_SERVERS) && (dns_pcb != NULL) &&
dirkx	0:355018f44c9f	277	(dnsserver != NULL) && !ip_addr_isany(dnsserver)) {
dirkx	0:355018f44c9f	278	dns_servers[numdns] = (*dnsserver);
dirkx	0:355018f44c9f	279	}
dirkx	0:355018f44c9f	280	}
dirkx	0:355018f44c9f	281
dirkx	0:355018f44c9f	282	/**
dirkx	0:355018f44c9f	283	* Obtain one of the currently configured DNS server.
dirkx	0:355018f44c9f	284	*
dirkx	0:355018f44c9f	285	* @param numdns the index of the DNS server
dirkx	0:355018f44c9f	286	* @return IP address of the indexed DNS server or "ip_addr_any" if the DNS
dirkx	0:355018f44c9f	287	* server has not been configured.
dirkx	0:355018f44c9f	288	*/
dirkx	0:355018f44c9f	289	ip_addr_t
dirkx	0:355018f44c9f	290	dns_getserver(u8_t numdns)
dirkx	0:355018f44c9f	291	{
dirkx	0:355018f44c9f	292	if (numdns < DNS_MAX_SERVERS) {
dirkx	0:355018f44c9f	293	return dns_servers[numdns];
dirkx	0:355018f44c9f	294	} else {
dirkx	0:355018f44c9f	295	return *IP_ADDR_ANY;
dirkx	0:355018f44c9f	296	}
dirkx	0:355018f44c9f	297	}
dirkx	0:355018f44c9f	298
dirkx	0:355018f44c9f	299	/**
dirkx	0:355018f44c9f	300	* The DNS resolver client timer - handle retries and timeouts and should
dirkx	0:355018f44c9f	301	* be called every DNS_TMR_INTERVAL milliseconds (every second by default).
dirkx	0:355018f44c9f	302	*/
dirkx	0:355018f44c9f	303	void
dirkx	0:355018f44c9f	304	dns_tmr(void)
dirkx	0:355018f44c9f	305	{
dirkx	0:355018f44c9f	306	if (dns_pcb != NULL) {
dirkx	0:355018f44c9f	307	LWIP_DEBUGF(DNS_DEBUG, ("dns_tmr: dns_check_entries\n"));
dirkx	0:355018f44c9f	308	dns_check_entries();
dirkx	0:355018f44c9f	309	}
dirkx	0:355018f44c9f	310	}
dirkx	0:355018f44c9f	311
dirkx	0:355018f44c9f	312	#if DNS_LOCAL_HOSTLIST
dirkx	0:355018f44c9f	313	static void
dirkx	0:355018f44c9f	314	dns_init_local()
dirkx	0:355018f44c9f	315	{
dirkx	0:355018f44c9f	316	#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC && defined(DNS_LOCAL_HOSTLIST_INIT)
dirkx	0:355018f44c9f	317	int i;
dirkx	0:355018f44c9f	318	struct local_hostlist_entry *entry;
dirkx	0:355018f44c9f	319	/* Dynamic: copy entries from DNS_LOCAL_HOSTLIST_INIT to list */
dirkx	0:355018f44c9f	320	struct local_hostlist_entry local_hostlist_init[] = DNS_LOCAL_HOSTLIST_INIT;
dirkx	0:355018f44c9f	321	size_t namelen;
dirkx	0:355018f44c9f	322	for (i = 0; i < sizeof(local_hostlist_init) / sizeof(struct local_hostlist_entry); i++) {
dirkx	0:355018f44c9f	323	struct local_hostlist_entry *init_entry = &local_hostlist_init[i];
dirkx	0:355018f44c9f	324	LWIP_ASSERT("invalid host name (NULL)", init_entry->name != NULL);
dirkx	0:355018f44c9f	325	namelen = strlen(init_entry->name);
dirkx	0:355018f44c9f	326	LWIP_ASSERT("namelen <= DNS_LOCAL_HOSTLIST_MAX_NAMELEN", namelen <= DNS_LOCAL_HOSTLIST_MAX_NAMELEN);
dirkx	0:355018f44c9f	327	entry = (struct local_hostlist_entry *)memp_malloc(MEMP_LOCALHOSTLIST);
dirkx	0:355018f44c9f	328	LWIP_ASSERT("mem-error in dns_init_local", entry != NULL);
dirkx	0:355018f44c9f	329	if (entry != NULL) {
dirkx	0:355018f44c9f	330	entry->name = (char*)entry + sizeof(struct local_hostlist_entry);
dirkx	0:355018f44c9f	331	MEMCPY((char*)entry->name, init_entry->name, namelen);
dirkx	0:355018f44c9f	332	((char*)entry->name)[namelen] = 0;
dirkx	0:355018f44c9f	333	entry->addr = init_entry->addr;
dirkx	0:355018f44c9f	334	entry->next = local_hostlist_dynamic;
dirkx	0:355018f44c9f	335	local_hostlist_dynamic = entry;
dirkx	0:355018f44c9f	336	}
dirkx	0:355018f44c9f	337	}
dirkx	0:355018f44c9f	338	#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC && defined(DNS_LOCAL_HOSTLIST_INIT) */
dirkx	0:355018f44c9f	339	}
dirkx	0:355018f44c9f	340
dirkx	0:355018f44c9f	341	/**
dirkx	0:355018f44c9f	342	* Scans the local host-list for a hostname.
dirkx	0:355018f44c9f	343	*
dirkx	0:355018f44c9f	344	* @param hostname Hostname to look for in the local host-list
dirkx	0:355018f44c9f	345	* @return The first IP address for the hostname in the local host-list or
dirkx	0:355018f44c9f	346	* IPADDR_NONE if not found.
dirkx	0:355018f44c9f	347	*/
dirkx	0:355018f44c9f	348	static u32_t
dirkx	0:355018f44c9f	349	dns_lookup_local(const char *hostname)
dirkx	0:355018f44c9f	350	{
dirkx	0:355018f44c9f	351	#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
dirkx	0:355018f44c9f	352	struct local_hostlist_entry *entry = local_hostlist_dynamic;
dirkx	0:355018f44c9f	353	while(entry != NULL) {
dirkx	0:355018f44c9f	354	if(strcmp(entry->name, hostname) == 0) {
dirkx	0:355018f44c9f	355	return ip4_addr_get_u32(&entry->addr);
dirkx	0:355018f44c9f	356	}
dirkx	0:355018f44c9f	357	entry = entry->next;
dirkx	0:355018f44c9f	358	}
dirkx	0:355018f44c9f	359	#else /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
dirkx	0:355018f44c9f	360	int i;
dirkx	0:355018f44c9f	361	for (i = 0; i < sizeof(local_hostlist_static) / sizeof(struct local_hostlist_entry); i++) {
dirkx	0:355018f44c9f	362	if(strcmp(local_hostlist_static[i].name, hostname) == 0) {
dirkx	0:355018f44c9f	363	return ip4_addr_get_u32(&local_hostlist_static[i].addr);
dirkx	0:355018f44c9f	364	}
dirkx	0:355018f44c9f	365	}
dirkx	0:355018f44c9f	366	#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
dirkx	0:355018f44c9f	367	return IPADDR_NONE;
dirkx	0:355018f44c9f	368	}
dirkx	0:355018f44c9f	369
dirkx	0:355018f44c9f	370	#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
dirkx	0:355018f44c9f	371	/** Remove all entries from the local host-list for a specific hostname
dirkx	0:355018f44c9f	372	* and/or IP addess
dirkx	0:355018f44c9f	373	*
dirkx	0:355018f44c9f	374	* @param hostname hostname for which entries shall be removed from the local
dirkx	0:355018f44c9f	375	* host-list
dirkx	0:355018f44c9f	376	* @param addr address for which entries shall be removed from the local host-list
dirkx	0:355018f44c9f	377	* @return the number of removed entries
dirkx	0:355018f44c9f	378	*/
dirkx	0:355018f44c9f	379	int
dirkx	0:355018f44c9f	380	dns_local_removehost(const char hostname, const ip_addr_t addr)
dirkx	0:355018f44c9f	381	{
dirkx	0:355018f44c9f	382	int removed = 0;
dirkx	0:355018f44c9f	383	struct local_hostlist_entry *entry = local_hostlist_dynamic;
dirkx	0:355018f44c9f	384	struct local_hostlist_entry *last_entry = NULL;
dirkx	0:355018f44c9f	385	while (entry != NULL) {
dirkx	0:355018f44c9f	386	if (((hostname == NULL) \|\| !strcmp(entry->name, hostname)) &&
dirkx	0:355018f44c9f	387	((addr == NULL) \|\| ip_addr_cmp(&entry->addr, addr))) {
dirkx	0:355018f44c9f	388	struct local_hostlist_entry *free_entry;
dirkx	0:355018f44c9f	389	if (last_entry != NULL) {
dirkx	0:355018f44c9f	390	last_entry->next = entry->next;
dirkx	0:355018f44c9f	391	} else {
dirkx	0:355018f44c9f	392	local_hostlist_dynamic = entry->next;
dirkx	0:355018f44c9f	393	}
dirkx	0:355018f44c9f	394	free_entry = entry;
dirkx	0:355018f44c9f	395	entry = entry->next;
dirkx	0:355018f44c9f	396	memp_free(MEMP_LOCALHOSTLIST, free_entry);
dirkx	0:355018f44c9f	397	removed++;
dirkx	0:355018f44c9f	398	} else {
dirkx	0:355018f44c9f	399	last_entry = entry;
dirkx	0:355018f44c9f	400	entry = entry->next;
dirkx	0:355018f44c9f	401	}
dirkx	0:355018f44c9f	402	}
dirkx	0:355018f44c9f	403	return removed;
dirkx	0:355018f44c9f	404	}
dirkx	0:355018f44c9f	405
dirkx	0:355018f44c9f	406	/**
dirkx	0:355018f44c9f	407	* Add a hostname/IP address pair to the local host-list.
dirkx	0:355018f44c9f	408	* Duplicates are not checked.
dirkx	0:355018f44c9f	409	*
dirkx	0:355018f44c9f	410	* @param hostname hostname of the new entry
dirkx	0:355018f44c9f	411	* @param addr IP address of the new entry
dirkx	0:355018f44c9f	412	* @return ERR_OK if succeeded or ERR_MEM on memory error
dirkx	0:355018f44c9f	413	*/
dirkx	0:355018f44c9f	414	err_t
dirkx	0:355018f44c9f	415	dns_local_addhost(const char hostname, const ip_addr_t addr)
dirkx	0:355018f44c9f	416	{
dirkx	0:355018f44c9f	417	struct local_hostlist_entry *entry;
dirkx	0:355018f44c9f	418	size_t namelen;
dirkx	0:355018f44c9f	419	LWIP_ASSERT("invalid host name (NULL)", hostname != NULL);
dirkx	0:355018f44c9f	420	namelen = strlen(hostname);
dirkx	0:355018f44c9f	421	LWIP_ASSERT("namelen <= DNS_LOCAL_HOSTLIST_MAX_NAMELEN", namelen <= DNS_LOCAL_HOSTLIST_MAX_NAMELEN);
dirkx	0:355018f44c9f	422	entry = (struct local_hostlist_entry *)memp_malloc(MEMP_LOCALHOSTLIST);
dirkx	0:355018f44c9f	423	if (entry == NULL) {
dirkx	0:355018f44c9f	424	return ERR_MEM;
dirkx	0:355018f44c9f	425	}
dirkx	0:355018f44c9f	426	entry->name = (char*)entry + sizeof(struct local_hostlist_entry);
dirkx	0:355018f44c9f	427	MEMCPY((char*)entry->name, hostname, namelen);
dirkx	0:355018f44c9f	428	((char*)entry->name)[namelen] = 0;
dirkx	0:355018f44c9f	429	ip_addr_copy(entry->addr, *addr);
dirkx	0:355018f44c9f	430	entry->next = local_hostlist_dynamic;
dirkx	0:355018f44c9f	431	local_hostlist_dynamic = entry;
dirkx	0:355018f44c9f	432	return ERR_OK;
dirkx	0:355018f44c9f	433	}
dirkx	0:355018f44c9f	434	#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC*/
dirkx	0:355018f44c9f	435	#endif /* DNS_LOCAL_HOSTLIST */
dirkx	0:355018f44c9f	436
dirkx	0:355018f44c9f	437	/**
dirkx	0:355018f44c9f	438	* Look up a hostname in the array of known hostnames.
dirkx	0:355018f44c9f	439	*
dirkx	0:355018f44c9f	440	* @note This function only looks in the internal array of known
dirkx	0:355018f44c9f	441	* hostnames, it does not send out a query for the hostname if none
dirkx	0:355018f44c9f	442	* was found. The function dns_enqueue() can be used to send a query
dirkx	0:355018f44c9f	443	* for a hostname.
dirkx	0:355018f44c9f	444	*
dirkx	0:355018f44c9f	445	* @param name the hostname to look up
dirkx	0:355018f44c9f	446	* @return the hostname's IP address, as u32_t (instead of ip_addr_t to
dirkx	0:355018f44c9f	447	* better check for failure: != IPADDR_NONE) or IPADDR_NONE if the hostname
dirkx	0:355018f44c9f	448	* was not found in the cached dns_table.
dirkx	0:355018f44c9f	449	*/
dirkx	0:355018f44c9f	450	static u32_t
dirkx	0:355018f44c9f	451	dns_lookup(const char *name)
dirkx	0:355018f44c9f	452	{
dirkx	0:355018f44c9f	453	u8_t i;
dirkx	0:355018f44c9f	454	#if DNS_LOCAL_HOSTLIST \|\| defined(DNS_LOOKUP_LOCAL_EXTERN)
dirkx	0:355018f44c9f	455	u32_t addr;
dirkx	0:355018f44c9f	456	#endif /* DNS_LOCAL_HOSTLIST \|\| defined(DNS_LOOKUP_LOCAL_EXTERN) */
dirkx	0:355018f44c9f	457	#if DNS_LOCAL_HOSTLIST
dirkx	0:355018f44c9f	458	if ((addr = dns_lookup_local(name)) != IPADDR_NONE) {
dirkx	0:355018f44c9f	459	return addr;
dirkx	0:355018f44c9f	460	}
dirkx	0:355018f44c9f	461	#endif /* DNS_LOCAL_HOSTLIST */
dirkx	0:355018f44c9f	462	#ifdef DNS_LOOKUP_LOCAL_EXTERN
dirkx	0:355018f44c9f	463	if((addr = DNS_LOOKUP_LOCAL_EXTERN(name)) != IPADDR_NONE) {
dirkx	0:355018f44c9f	464	return addr;
dirkx	0:355018f44c9f	465	}
dirkx	0:355018f44c9f	466	#endif /* DNS_LOOKUP_LOCAL_EXTERN */
dirkx	0:355018f44c9f	467
dirkx	0:355018f44c9f	468	/* Walk through name list, return entry if found. If not, return NULL. */
dirkx	0:355018f44c9f	469	for (i = 0; i < DNS_TABLE_SIZE; ++i) {
dirkx	0:355018f44c9f	470	if ((dns_table[i].state == DNS_STATE_DONE) &&
dirkx	0:355018f44c9f	471	(strcmp(name, dns_table[i].name) == 0)) {
dirkx	0:355018f44c9f	472	LWIP_DEBUGF(DNS_DEBUG, ("dns_lookup: \"%s\": found = ", name));
dirkx	0:355018f44c9f	473	ip_addr_debug_print(DNS_DEBUG, &(dns_table[i].ipaddr));
dirkx	0:355018f44c9f	474	LWIP_DEBUGF(DNS_DEBUG, ("\n"));
dirkx	0:355018f44c9f	475	return ip4_addr_get_u32(&dns_table[i].ipaddr);
dirkx	0:355018f44c9f	476	}
dirkx	0:355018f44c9f	477	}
dirkx	0:355018f44c9f	478
dirkx	0:355018f44c9f	479	return IPADDR_NONE;
dirkx	0:355018f44c9f	480	}
dirkx	0:355018f44c9f	481
dirkx	0:355018f44c9f	482	#if DNS_DOES_NAME_CHECK
dirkx	0:355018f44c9f	483	/**
dirkx	0:355018f44c9f	484	* Compare the "dotted" name "query" with the encoded name "response"
dirkx	0:355018f44c9f	485	* to make sure an answer from the DNS server matches the current dns_table
dirkx	0:355018f44c9f	486	* entry (otherwise, answers might arrive late for hostname not on the list
dirkx	0:355018f44c9f	487	* any more).
dirkx	0:355018f44c9f	488	*
dirkx	0:355018f44c9f	489	* @param query hostname (not encoded) from the dns_table
dirkx	0:355018f44c9f	490	* @param response encoded hostname in the DNS response
dirkx	0:355018f44c9f	491	* @return 0: names equal; 1: names differ
dirkx	0:355018f44c9f	492	*/
dirkx	0:355018f44c9f	493	static u8_t
dirkx	0:355018f44c9f	494	dns_compare_name(unsigned char query, unsigned char response)
dirkx	0:355018f44c9f	495	{
dirkx	0:355018f44c9f	496	unsigned char n;
dirkx	0:355018f44c9f	497
dirkx	0:355018f44c9f	498	do {
dirkx	0:355018f44c9f	499	n = *response++;
dirkx	0:355018f44c9f	500	/** @see RFC 1035 - 4.1.4. Message compression */
dirkx	0:355018f44c9f	501	if ((n & 0xc0) == 0xc0) {
dirkx	0:355018f44c9f	502	/* Compressed name */
dirkx	0:355018f44c9f	503	break;
dirkx	0:355018f44c9f	504	} else {
dirkx	0:355018f44c9f	505	/* Not compressed name */
dirkx	0:355018f44c9f	506	while (n > 0) {
dirkx	0:355018f44c9f	507	if ((query) != (response)) {
dirkx	0:355018f44c9f	508	return 1;
dirkx	0:355018f44c9f	509	}
dirkx	0:355018f44c9f	510	++response;
dirkx	0:355018f44c9f	511	++query;
dirkx	0:355018f44c9f	512	--n;
dirkx	0:355018f44c9f	513	};
dirkx	0:355018f44c9f	514	++query;
dirkx	0:355018f44c9f	515	}
dirkx	0:355018f44c9f	516	} while (*response != 0);
dirkx	0:355018f44c9f	517
dirkx	0:355018f44c9f	518	return 0;
dirkx	0:355018f44c9f	519	}
dirkx	0:355018f44c9f	520	#endif /* DNS_DOES_NAME_CHECK */
dirkx	0:355018f44c9f	521
dirkx	0:355018f44c9f	522	/**
dirkx	0:355018f44c9f	523	* Walk through a compact encoded DNS name and return the end of the name.
dirkx	0:355018f44c9f	524	*
dirkx	0:355018f44c9f	525	* @param query encoded DNS name in the DNS server response
dirkx	0:355018f44c9f	526	* @return end of the name
dirkx	0:355018f44c9f	527	*/
dirkx	0:355018f44c9f	528	static unsigned char *
dirkx	0:355018f44c9f	529	dns_parse_name(unsigned char *query)
dirkx	0:355018f44c9f	530	{
dirkx	0:355018f44c9f	531	unsigned char n;
dirkx	0:355018f44c9f	532
dirkx	0:355018f44c9f	533	do {
dirkx	0:355018f44c9f	534	n = *query++;
dirkx	0:355018f44c9f	535	/** @see RFC 1035 - 4.1.4. Message compression */
dirkx	0:355018f44c9f	536	if ((n & 0xc0) == 0xc0) {
dirkx	0:355018f44c9f	537	/* Compressed name */
dirkx	0:355018f44c9f	538	break;
dirkx	0:355018f44c9f	539	} else {
dirkx	0:355018f44c9f	540	/* Not compressed name */
dirkx	0:355018f44c9f	541	while (n > 0) {
dirkx	0:355018f44c9f	542	++query;
dirkx	0:355018f44c9f	543	--n;
dirkx	0:355018f44c9f	544	};
dirkx	0:355018f44c9f	545	}
dirkx	0:355018f44c9f	546	} while (*query != 0);
dirkx	0:355018f44c9f	547
dirkx	0:355018f44c9f	548	return query + 1;
dirkx	0:355018f44c9f	549	}
dirkx	0:355018f44c9f	550
dirkx	0:355018f44c9f	551	/**
dirkx	0:355018f44c9f	552	* Send a DNS query packet.
dirkx	0:355018f44c9f	553	*
dirkx	0:355018f44c9f	554	* @param numdns index of the DNS server in the dns_servers table
dirkx	0:355018f44c9f	555	* @param name hostname to query
dirkx	0:355018f44c9f	556	* @param id index of the hostname in dns_table, used as transaction ID in the
dirkx	0:355018f44c9f	557	* DNS query packet
dirkx	0:355018f44c9f	558	* @return ERR_OK if packet is sent; an err_t indicating the problem otherwise
dirkx	0:355018f44c9f	559	*/
dirkx	0:355018f44c9f	560	static err_t
dirkx	0:355018f44c9f	561	dns_send(u8_t numdns, const char* name, u8_t id)
dirkx	0:355018f44c9f	562	{
dirkx	0:355018f44c9f	563	err_t err;
dirkx	0:355018f44c9f	564	struct dns_hdr *hdr;
dirkx	0:355018f44c9f	565	struct dns_query qry;
dirkx	0:355018f44c9f	566	struct pbuf *p;
dirkx	0:355018f44c9f	567	char query, nptr;
dirkx	0:355018f44c9f	568	const char *pHostname;
dirkx	0:355018f44c9f	569	u8_t n;
dirkx	0:355018f44c9f	570
dirkx	0:355018f44c9f	571	LWIP_DEBUGF(DNS_DEBUG, ("dns_send: dns_servers[%"U16_F"] \"%s\": request\n",
dirkx	0:355018f44c9f	572	(u16_t)(numdns), name));
dirkx	0:355018f44c9f	573	LWIP_ASSERT("dns server out of array", numdns < DNS_MAX_SERVERS);
dirkx	0:355018f44c9f	574	LWIP_ASSERT("dns server has no IP address set", !ip_addr_isany(&dns_servers[numdns]));
dirkx	0:355018f44c9f	575
dirkx	0:355018f44c9f	576	/* if here, we have either a new query or a retry on a previous query to process */
dirkx	0:355018f44c9f	577	p = pbuf_alloc(PBUF_TRANSPORT, SIZEOF_DNS_HDR + DNS_MAX_NAME_LENGTH +
dirkx	0:355018f44c9f	578	SIZEOF_DNS_QUERY, PBUF_RAM);
dirkx	0:355018f44c9f	579	if (p != NULL) {
dirkx	0:355018f44c9f	580	LWIP_ASSERT("pbuf must be in one piece", p->next == NULL);
dirkx	0:355018f44c9f	581	/* fill dns header */
dirkx	0:355018f44c9f	582	hdr = (struct dns_hdr*)p->payload;
dirkx	0:355018f44c9f	583	memset(hdr, 0, SIZEOF_DNS_HDR);
dirkx	0:355018f44c9f	584	hdr->id = htons(id);
dirkx	0:355018f44c9f	585	hdr->flags1 = DNS_FLAG1_RD;
dirkx	0:355018f44c9f	586	hdr->numquestions = PP_HTONS(1);
dirkx	0:355018f44c9f	587	query = (char*)hdr + SIZEOF_DNS_HDR;
dirkx	0:355018f44c9f	588	pHostname = name;
dirkx	0:355018f44c9f	589	--pHostname;
dirkx	0:355018f44c9f	590
dirkx	0:355018f44c9f	591	/* convert hostname into suitable query format. */
dirkx	0:355018f44c9f	592	do {
dirkx	0:355018f44c9f	593	++pHostname;
dirkx	0:355018f44c9f	594	nptr = query;
dirkx	0:355018f44c9f	595	++query;
dirkx	0:355018f44c9f	596	for(n = 0; pHostname != '.' && pHostname != 0; ++pHostname) {
dirkx	0:355018f44c9f	597	query = pHostname;
dirkx	0:355018f44c9f	598	++query;
dirkx	0:355018f44c9f	599	++n;
dirkx	0:355018f44c9f	600	}
dirkx	0:355018f44c9f	601	*nptr = n;
dirkx	0:355018f44c9f	602	} while(*pHostname != 0);
dirkx	0:355018f44c9f	603	*query++='\0';
dirkx	0:355018f44c9f	604
dirkx	0:355018f44c9f	605	/* fill dns query */
dirkx	0:355018f44c9f	606	qry.type = PP_HTONS(DNS_RRTYPE_A);
dirkx	0:355018f44c9f	607	qry.cls = PP_HTONS(DNS_RRCLASS_IN);
dirkx	0:355018f44c9f	608	SMEMCPY(query, &qry, SIZEOF_DNS_QUERY);
dirkx	0:355018f44c9f	609
dirkx	0:355018f44c9f	610	/* resize pbuf to the exact dns query */
dirkx	0:355018f44c9f	611	pbuf_realloc(p, (u16_t)((query + SIZEOF_DNS_QUERY) - ((char*)(p->payload))));
dirkx	0:355018f44c9f	612
dirkx	0:355018f44c9f	613	/* connect to the server for faster receiving */
dirkx	0:355018f44c9f	614	udp_connect(dns_pcb, &dns_servers[numdns], DNS_SERVER_PORT);
dirkx	0:355018f44c9f	615	/* send dns packet */
dirkx	0:355018f44c9f	616	err = udp_sendto(dns_pcb, p, &dns_servers[numdns], DNS_SERVER_PORT);
dirkx	0:355018f44c9f	617
dirkx	0:355018f44c9f	618	/* free pbuf */
dirkx	0:355018f44c9f	619	pbuf_free(p);
dirkx	0:355018f44c9f	620	} else {
dirkx	0:355018f44c9f	621	err = ERR_MEM;
dirkx	0:355018f44c9f	622	}
dirkx	0:355018f44c9f	623
dirkx	0:355018f44c9f	624	return err;
dirkx	0:355018f44c9f	625	}
dirkx	0:355018f44c9f	626
dirkx	0:355018f44c9f	627	/**
dirkx	0:355018f44c9f	628	* dns_check_entry() - see if pEntry has not yet been queried and, if so, sends out a query.
dirkx	0:355018f44c9f	629	* Check an entry in the dns_table:
dirkx	0:355018f44c9f	630	* - send out query for new entries
dirkx	0:355018f44c9f	631	* - retry old pending entries on timeout (also with different servers)
dirkx	0:355018f44c9f	632	* - remove completed entries from the table if their TTL has expired
dirkx	0:355018f44c9f	633	*
dirkx	0:355018f44c9f	634	* @param i index of the dns_table entry to check
dirkx	0:355018f44c9f	635	*/
dirkx	0:355018f44c9f	636	static void
dirkx	0:355018f44c9f	637	dns_check_entry(u8_t i)
dirkx	0:355018f44c9f	638	{
dirkx	0:355018f44c9f	639	err_t err;
dirkx	0:355018f44c9f	640	struct dns_table_entry *pEntry = &dns_table[i];
dirkx	0:355018f44c9f	641
dirkx	0:355018f44c9f	642	LWIP_ASSERT("array index out of bounds", i < DNS_TABLE_SIZE);
dirkx	0:355018f44c9f	643
dirkx	0:355018f44c9f	644	switch(pEntry->state) {
dirkx	0:355018f44c9f	645
dirkx	0:355018f44c9f	646	case DNS_STATE_NEW: {
dirkx	0:355018f44c9f	647	/* initialize new entry */
dirkx	0:355018f44c9f	648	pEntry->state = DNS_STATE_ASKING;
dirkx	0:355018f44c9f	649	pEntry->numdns = 0;
dirkx	0:355018f44c9f	650	pEntry->tmr = 1;
dirkx	0:355018f44c9f	651	pEntry->retries = 0;
dirkx	0:355018f44c9f	652
dirkx	0:355018f44c9f	653	/* send DNS packet for this entry */
dirkx	0:355018f44c9f	654	err = dns_send(pEntry->numdns, pEntry->name, i);
dirkx	0:355018f44c9f	655	if (err != ERR_OK) {
dirkx	0:355018f44c9f	656	LWIP_DEBUGF(DNS_DEBUG \| LWIP_DBG_LEVEL_WARNING,
dirkx	0:355018f44c9f	657	("dns_send returned error: %d\n", err));
dirkx	0:355018f44c9f	658	}
dirkx	0:355018f44c9f	659	break;
dirkx	0:355018f44c9f	660	}
dirkx	0:355018f44c9f	661
dirkx	0:355018f44c9f	662	case DNS_STATE_ASKING: {
dirkx	0:355018f44c9f	663	if (--pEntry->tmr == 0) {
dirkx	0:355018f44c9f	664	if (++pEntry->retries == DNS_MAX_RETRIES) {
dirkx	0:355018f44c9f	665	if ((pEntry->numdns+1<DNS_MAX_SERVERS) && !ip_addr_isany(&dns_servers[pEntry->numdns+1])) {
dirkx	0:355018f44c9f	666	/* change of server */
dirkx	0:355018f44c9f	667	pEntry->numdns++;
dirkx	0:355018f44c9f	668	pEntry->tmr = 1;
dirkx	0:355018f44c9f	669	pEntry->retries = 0;
dirkx	0:355018f44c9f	670	break;
dirkx	0:355018f44c9f	671	} else {
dirkx	0:355018f44c9f	672	LWIP_DEBUGF(DNS_DEBUG, ("dns_check_entry: \"%s\": timeout\n", pEntry->name));
dirkx	0:355018f44c9f	673	/* call specified callback function if provided */
dirkx	0:355018f44c9f	674	if (pEntry->found)
dirkx	0:355018f44c9f	675	(*pEntry->found)(pEntry->name, NULL, pEntry->arg);
dirkx	0:355018f44c9f	676	/* flush this entry */
dirkx	0:355018f44c9f	677	pEntry->state = DNS_STATE_UNUSED;
dirkx	0:355018f44c9f	678	pEntry->found = NULL;
dirkx	0:355018f44c9f	679	break;
dirkx	0:355018f44c9f	680	}
dirkx	0:355018f44c9f	681	}
dirkx	0:355018f44c9f	682
dirkx	0:355018f44c9f	683	/* wait longer for the next retry */
dirkx	0:355018f44c9f	684	pEntry->tmr = pEntry->retries;
dirkx	0:355018f44c9f	685
dirkx	0:355018f44c9f	686	/* send DNS packet for this entry */
dirkx	0:355018f44c9f	687	err = dns_send(pEntry->numdns, pEntry->name, i);
dirkx	0:355018f44c9f	688	if (err != ERR_OK) {
dirkx	0:355018f44c9f	689	LWIP_DEBUGF(DNS_DEBUG \| LWIP_DBG_LEVEL_WARNING,
dirkx	0:355018f44c9f	690	("dns_send returned error: %d\n", err));
dirkx	0:355018f44c9f	691	}
dirkx	0:355018f44c9f	692	}
dirkx	0:355018f44c9f	693	break;
dirkx	0:355018f44c9f	694	}
dirkx	0:355018f44c9f	695
dirkx	0:355018f44c9f	696	case DNS_STATE_DONE: {
dirkx	0:355018f44c9f	697	/* if the time to live is nul */
dirkx	0:355018f44c9f	698	if (--pEntry->ttl == 0) {
dirkx	0:355018f44c9f	699	LWIP_DEBUGF(DNS_DEBUG, ("dns_check_entry: \"%s\": flush\n", pEntry->name));
dirkx	0:355018f44c9f	700	/* flush this entry */
dirkx	0:355018f44c9f	701	pEntry->state = DNS_STATE_UNUSED;
dirkx	0:355018f44c9f	702	pEntry->found = NULL;
dirkx	0:355018f44c9f	703	}
dirkx	0:355018f44c9f	704	break;
dirkx	0:355018f44c9f	705	}
dirkx	0:355018f44c9f	706	case DNS_STATE_UNUSED:
dirkx	0:355018f44c9f	707	/* nothing to do */
dirkx	0:355018f44c9f	708	break;
dirkx	0:355018f44c9f	709	default:
dirkx	0:355018f44c9f	710	LWIP_ASSERT("unknown dns_table entry state:", 0);
dirkx	0:355018f44c9f	711	break;
dirkx	0:355018f44c9f	712	}
dirkx	0:355018f44c9f	713	}
dirkx	0:355018f44c9f	714
dirkx	0:355018f44c9f	715	/**
dirkx	0:355018f44c9f	716	* Call dns_check_entry for each entry in dns_table - check all entries.
dirkx	0:355018f44c9f	717	*/
dirkx	0:355018f44c9f	718	static void
dirkx	0:355018f44c9f	719	dns_check_entries(void)
dirkx	0:355018f44c9f	720	{
dirkx	0:355018f44c9f	721	u8_t i;
dirkx	0:355018f44c9f	722
dirkx	0:355018f44c9f	723	for (i = 0; i < DNS_TABLE_SIZE; ++i) {
dirkx	0:355018f44c9f	724	dns_check_entry(i);
dirkx	0:355018f44c9f	725	}
dirkx	0:355018f44c9f	726	}
dirkx	0:355018f44c9f	727
dirkx	0:355018f44c9f	728	/**
dirkx	0:355018f44c9f	729	* Receive input function for DNS response packets arriving for the dns UDP pcb.
dirkx	0:355018f44c9f	730	*
dirkx	0:355018f44c9f	731	* @params see udp.h
dirkx	0:355018f44c9f	732	*/
dirkx	0:355018f44c9f	733	static void
dirkx	0:355018f44c9f	734	dns_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port)
dirkx	0:355018f44c9f	735	{
dirkx	0:355018f44c9f	736	u16_t i;
dirkx	0:355018f44c9f	737	char *pHostname;
dirkx	0:355018f44c9f	738	struct dns_hdr *hdr;
dirkx	0:355018f44c9f	739	struct dns_answer ans;
dirkx	0:355018f44c9f	740	struct dns_table_entry *pEntry;
dirkx	0:355018f44c9f	741	u16_t nquestions, nanswers;
dirkx	0:355018f44c9f	742
dirkx	0:355018f44c9f	743	LWIP_UNUSED_ARG(arg);
dirkx	0:355018f44c9f	744	LWIP_UNUSED_ARG(pcb);
dirkx	0:355018f44c9f	745	LWIP_UNUSED_ARG(addr);
dirkx	0:355018f44c9f	746	LWIP_UNUSED_ARG(port);
dirkx	0:355018f44c9f	747
dirkx	0:355018f44c9f	748	/* is the dns message too big ? */
dirkx	0:355018f44c9f	749	if (p->tot_len > DNS_MSG_SIZE) {
dirkx	0:355018f44c9f	750	LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: pbuf too big\n"));
dirkx	0:355018f44c9f	751	/* free pbuf and return */
dirkx	0:355018f44c9f	752	goto memerr;
dirkx	0:355018f44c9f	753	}
dirkx	0:355018f44c9f	754
dirkx	0:355018f44c9f	755	/* is the dns message big enough ? */
dirkx	0:355018f44c9f	756	if (p->tot_len < (SIZEOF_DNS_HDR + SIZEOF_DNS_QUERY + SIZEOF_DNS_ANSWER)) {
dirkx	0:355018f44c9f	757	LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: pbuf too small\n"));
dirkx	0:355018f44c9f	758	/* free pbuf and return */
dirkx	0:355018f44c9f	759	goto memerr;
dirkx	0:355018f44c9f	760	}
dirkx	0:355018f44c9f	761
dirkx	0:355018f44c9f	762	/* copy dns payload inside static buffer for processing */
dirkx	0:355018f44c9f	763	if (pbuf_copy_partial(p, dns_payload, p->tot_len, 0) == p->tot_len) {
dirkx	0:355018f44c9f	764	/* The ID in the DNS header should be our entry into the name table. */
dirkx	0:355018f44c9f	765	hdr = (struct dns_hdr*)dns_payload;
dirkx	0:355018f44c9f	766	i = htons(hdr->id);
dirkx	0:355018f44c9f	767	if (i < DNS_TABLE_SIZE) {
dirkx	0:355018f44c9f	768	pEntry = &dns_table[i];
dirkx	0:355018f44c9f	769	if(pEntry->state == DNS_STATE_ASKING) {
dirkx	0:355018f44c9f	770	/* This entry is now completed. */
dirkx	0:355018f44c9f	771	pEntry->state = DNS_STATE_DONE;
dirkx	0:355018f44c9f	772	pEntry->err = hdr->flags2 & DNS_FLAG2_ERR_MASK;
dirkx	0:355018f44c9f	773
dirkx	0:355018f44c9f	774	/* We only care about the question(s) and the answers. The authrr
dirkx	0:355018f44c9f	775	and the extrarr are simply discarded. */
dirkx	0:355018f44c9f	776	nquestions = htons(hdr->numquestions);
dirkx	0:355018f44c9f	777	nanswers = htons(hdr->numanswers);
dirkx	0:355018f44c9f	778
dirkx	0:355018f44c9f	779	/* Check for error. If so, call callback to inform. */
dirkx	0:355018f44c9f	780	if (((hdr->flags1 & DNS_FLAG1_RESPONSE) == 0) \|\| (pEntry->err != 0) \|\| (nquestions != 1)) {
dirkx	0:355018f44c9f	781	LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": error in flags\n", pEntry->name));
dirkx	0:355018f44c9f	782	/* call callback to indicate error, clean up memory and return */
dirkx	0:355018f44c9f	783	goto responseerr;
dirkx	0:355018f44c9f	784	}
dirkx	0:355018f44c9f	785
dirkx	0:355018f44c9f	786	#if DNS_DOES_NAME_CHECK
dirkx	0:355018f44c9f	787	/* Check if the name in the "question" part match with the name in the entry. */
dirkx	0:355018f44c9f	788	if (dns_compare_name((unsigned char )(pEntry->name), (unsigned char )dns_payload + SIZEOF_DNS_HDR) != 0) {
dirkx	0:355018f44c9f	789	LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response not match to query\n", pEntry->name));
dirkx	0:355018f44c9f	790	/* call callback to indicate error, clean up memory and return */
dirkx	0:355018f44c9f	791	goto responseerr;
dirkx	0:355018f44c9f	792	}
dirkx	0:355018f44c9f	793	#endif /* DNS_DOES_NAME_CHECK */
dirkx	0:355018f44c9f	794
dirkx	0:355018f44c9f	795	/* Skip the name in the "question" part */
dirkx	0:355018f44c9f	796	pHostname = (char ) dns_parse_name((unsigned char )dns_payload + SIZEOF_DNS_HDR) + SIZEOF_DNS_QUERY;
dirkx	0:355018f44c9f	797
dirkx	0:355018f44c9f	798	while (nanswers > 0) {
dirkx	0:355018f44c9f	799	/* skip answer resource record's host name */
dirkx	0:355018f44c9f	800	pHostname = (char ) dns_parse_name((unsigned char )pHostname);
dirkx	0:355018f44c9f	801
dirkx	0:355018f44c9f	802	/* Check for IP address type and Internet class. Others are discarded. */
dirkx	0:355018f44c9f	803	SMEMCPY(&ans, pHostname, SIZEOF_DNS_ANSWER);
dirkx	0:355018f44c9f	804	if((ans.type == PP_HTONS(DNS_RRTYPE_A)) && (ans.cls == PP_HTONS(DNS_RRCLASS_IN)) &&
dirkx	0:355018f44c9f	805	(ans.len == PP_HTONS(sizeof(ip_addr_t))) ) {
dirkx	0:355018f44c9f	806	/* read the answer resource record's TTL, and maximize it if needed */
dirkx	0:355018f44c9f	807	pEntry->ttl = ntohl(ans.ttl);
dirkx	0:355018f44c9f	808	if (pEntry->ttl > DNS_MAX_TTL) {
dirkx	0:355018f44c9f	809	pEntry->ttl = DNS_MAX_TTL;
dirkx	0:355018f44c9f	810	}
dirkx	0:355018f44c9f	811	/* read the IP address after answer resource record's header */
dirkx	0:355018f44c9f	812	SMEMCPY(&(pEntry->ipaddr), (pHostname+SIZEOF_DNS_ANSWER), sizeof(ip_addr_t));
dirkx	0:355018f44c9f	813	LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response = ", pEntry->name));
dirkx	0:355018f44c9f	814	ip_addr_debug_print(DNS_DEBUG, (&(pEntry->ipaddr)));
dirkx	0:355018f44c9f	815	LWIP_DEBUGF(DNS_DEBUG, ("\n"));
dirkx	0:355018f44c9f	816	/* call specified callback function if provided */
dirkx	0:355018f44c9f	817	if (pEntry->found) {
dirkx	0:355018f44c9f	818	(*pEntry->found)(pEntry->name, &pEntry->ipaddr, pEntry->arg);
dirkx	0:355018f44c9f	819	}
dirkx	0:355018f44c9f	820	/* deallocate memory and return */
dirkx	0:355018f44c9f	821	goto memerr;
dirkx	0:355018f44c9f	822	} else {
dirkx	0:355018f44c9f	823	pHostname = pHostname + SIZEOF_DNS_ANSWER + htons(ans.len);
dirkx	0:355018f44c9f	824	}
dirkx	0:355018f44c9f	825	--nanswers;
dirkx	0:355018f44c9f	826	}
dirkx	0:355018f44c9f	827	LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": error in response\n", pEntry->name));
dirkx	0:355018f44c9f	828	/* call callback to indicate error, clean up memory and return */
dirkx	0:355018f44c9f	829	goto responseerr;
dirkx	0:355018f44c9f	830	}
dirkx	0:355018f44c9f	831	}
dirkx	0:355018f44c9f	832	}
dirkx	0:355018f44c9f	833
dirkx	0:355018f44c9f	834	/* deallocate memory and return */
dirkx	0:355018f44c9f	835	goto memerr;
dirkx	0:355018f44c9f	836
dirkx	0:355018f44c9f	837	responseerr:
dirkx	0:355018f44c9f	838	/* ERROR: call specified callback function with NULL as name to indicate an error */
dirkx	0:355018f44c9f	839	if (pEntry->found) {
dirkx	0:355018f44c9f	840	(*pEntry->found)(pEntry->name, NULL, pEntry->arg);
dirkx	0:355018f44c9f	841	}
dirkx	0:355018f44c9f	842	/* flush this entry */
dirkx	0:355018f44c9f	843	pEntry->state = DNS_STATE_UNUSED;
dirkx	0:355018f44c9f	844	pEntry->found = NULL;
dirkx	0:355018f44c9f	845
dirkx	0:355018f44c9f	846	memerr:
dirkx	0:355018f44c9f	847	/* free pbuf */
dirkx	0:355018f44c9f	848	pbuf_free(p);
dirkx	0:355018f44c9f	849	return;
dirkx	0:355018f44c9f	850	}
dirkx	0:355018f44c9f	851
dirkx	0:355018f44c9f	852	/**
dirkx	0:355018f44c9f	853	* Queues a new hostname to resolve and sends out a DNS query for that hostname
dirkx	0:355018f44c9f	854	*
dirkx	0:355018f44c9f	855	* @param name the hostname that is to be queried
dirkx	0:355018f44c9f	856	* @param found a callback founction to be called on success, failure or timeout
dirkx	0:355018f44c9f	857	* @param callback_arg argument to pass to the callback function
dirkx	0:355018f44c9f	858	* @return @return a err_t return code.
dirkx	0:355018f44c9f	859	*/
dirkx	0:355018f44c9f	860	static err_t
dirkx	0:355018f44c9f	861	dns_enqueue(const char name, dns_found_callback found, void callback_arg)
dirkx	0:355018f44c9f	862	{
dirkx	0:355018f44c9f	863	u8_t i;
dirkx	0:355018f44c9f	864	u8_t lseq, lseqi;
dirkx	0:355018f44c9f	865	struct dns_table_entry *pEntry = NULL;
dirkx	0:355018f44c9f	866	size_t namelen;
dirkx	0:355018f44c9f	867
dirkx	0:355018f44c9f	868	/* search an unused entry, or the oldest one */
dirkx	0:355018f44c9f	869	lseq = lseqi = 0;
dirkx	0:355018f44c9f	870	for (i = 0; i < DNS_TABLE_SIZE; ++i) {
dirkx	0:355018f44c9f	871	pEntry = &dns_table[i];
dirkx	0:355018f44c9f	872	/* is it an unused entry ? */
dirkx	0:355018f44c9f	873	if (pEntry->state == DNS_STATE_UNUSED)
dirkx	0:355018f44c9f	874	break;
dirkx	0:355018f44c9f	875
dirkx	0:355018f44c9f	876	/* check if this is the oldest completed entry */
dirkx	0:355018f44c9f	877	if (pEntry->state == DNS_STATE_DONE) {
dirkx	0:355018f44c9f	878	if ((dns_seqno - pEntry->seqno) > lseq) {
dirkx	0:355018f44c9f	879	lseq = dns_seqno - pEntry->seqno;
dirkx	0:355018f44c9f	880	lseqi = i;
dirkx	0:355018f44c9f	881	}
dirkx	0:355018f44c9f	882	}
dirkx	0:355018f44c9f	883	}
dirkx	0:355018f44c9f	884
dirkx	0:355018f44c9f	885	/* if we don't have found an unused entry, use the oldest completed one */
dirkx	0:355018f44c9f	886	if (i == DNS_TABLE_SIZE) {
dirkx	0:355018f44c9f	887	if ((lseqi >= DNS_TABLE_SIZE) \|\| (dns_table[lseqi].state != DNS_STATE_DONE)) {
dirkx	0:355018f44c9f	888	/* no entry can't be used now, table is full */
dirkx	0:355018f44c9f	889	LWIP_DEBUGF(DNS_DEBUG, ("dns_enqueue: \"%s\": DNS entries table is full\n", name));
dirkx	0:355018f44c9f	890	return ERR_MEM;
dirkx	0:355018f44c9f	891	} else {
dirkx	0:355018f44c9f	892	/* use the oldest completed one */
dirkx	0:355018f44c9f	893	i = lseqi;
dirkx	0:355018f44c9f	894	pEntry = &dns_table[i];
dirkx	0:355018f44c9f	895	}
dirkx	0:355018f44c9f	896	}
dirkx	0:355018f44c9f	897
dirkx	0:355018f44c9f	898	/* use this entry */
dirkx	0:355018f44c9f	899	LWIP_DEBUGF(DNS_DEBUG, ("dns_enqueue: \"%s\": use DNS entry %"U16_F"\n", name, (u16_t)(i)));
dirkx	0:355018f44c9f	900
dirkx	0:355018f44c9f	901	/* fill the entry */
dirkx	0:355018f44c9f	902	pEntry->state = DNS_STATE_NEW;
dirkx	0:355018f44c9f	903	pEntry->seqno = dns_seqno++;
dirkx	0:355018f44c9f	904	pEntry->found = found;
dirkx	0:355018f44c9f	905	pEntry->arg = callback_arg;
dirkx	0:355018f44c9f	906	namelen = LWIP_MIN(strlen(name), DNS_MAX_NAME_LENGTH-1);
dirkx	0:355018f44c9f	907	MEMCPY(pEntry->name, name, namelen);
dirkx	0:355018f44c9f	908	pEntry->name[namelen] = 0;
dirkx	0:355018f44c9f	909
dirkx	0:355018f44c9f	910	/* force to send query without waiting timer */
dirkx	0:355018f44c9f	911	dns_check_entry(i);
dirkx	0:355018f44c9f	912
dirkx	0:355018f44c9f	913	/* dns query is enqueued */
dirkx	0:355018f44c9f	914	return ERR_INPROGRESS;
dirkx	0:355018f44c9f	915	}
dirkx	0:355018f44c9f	916
dirkx	0:355018f44c9f	917	/**
dirkx	0:355018f44c9f	918	* Resolve a hostname (string) into an IP address.
dirkx	0:355018f44c9f	919	* NON-BLOCKING callback version for use with raw API!!!
dirkx	0:355018f44c9f	920	*
dirkx	0:355018f44c9f	921	* Returns immediately with one of err_t return codes:
dirkx	0:355018f44c9f	922	* - ERR_OK if hostname is a valid IP address string or the host
dirkx	0:355018f44c9f	923	* name is already in the local names table.
dirkx	0:355018f44c9f	924	* - ERR_INPROGRESS enqueue a request to be sent to the DNS server
dirkx	0:355018f44c9f	925	* for resolution if no errors are present.
dirkx	0:355018f44c9f	926	*
dirkx	0:355018f44c9f	927	* @param hostname the hostname that is to be queried
dirkx	0:355018f44c9f	928	* @param addr pointer to a ip_addr_t where to store the address if it is already
dirkx	0:355018f44c9f	929	* cached in the dns_table (only valid if ERR_OK is returned!)
dirkx	0:355018f44c9f	930	* @param found a callback function to be called on success, failure or timeout (only if
dirkx	0:355018f44c9f	931	* ERR_INPROGRESS is returned!)
dirkx	0:355018f44c9f	932	* @param callback_arg argument to pass to the callback function
dirkx	0:355018f44c9f	933	* @return a err_t return code.
dirkx	0:355018f44c9f	934	*/
dirkx	0:355018f44c9f	935	err_t
dirkx	0:355018f44c9f	936	dns_gethostbyname(const char hostname, ip_addr_t addr, dns_found_callback found,
dirkx	0:355018f44c9f	937	void *callback_arg)
dirkx	0:355018f44c9f	938	{
dirkx	0:355018f44c9f	939	u32_t ipaddr;
dirkx	0:355018f44c9f	940	/* not initialized or no valid server yet, or invalid addr pointer
dirkx	0:355018f44c9f	941	* or invalid hostname or invalid hostname length */
dirkx	0:355018f44c9f	942	if ((dns_pcb == NULL) \|\| (addr == NULL) \|\|
dirkx	0:355018f44c9f	943	(!hostname) \|\| (!hostname[0]) \|\|
dirkx	0:355018f44c9f	944	(strlen(hostname) >= DNS_MAX_NAME_LENGTH)) {
dirkx	0:355018f44c9f	945	return ERR_VAL;
dirkx	0:355018f44c9f	946	}
dirkx	0:355018f44c9f	947
dirkx	0:355018f44c9f	948	#if LWIP_HAVE_LOOPIF
dirkx	0:355018f44c9f	949	if (strcmp(hostname, "localhost")==0) {
dirkx	0:355018f44c9f	950	ip_addr_set_loopback(addr);
dirkx	0:355018f44c9f	951	return ERR_OK;
dirkx	0:355018f44c9f	952	}
dirkx	0:355018f44c9f	953	#endif /* LWIP_HAVE_LOOPIF */
dirkx	0:355018f44c9f	954
dirkx	0:355018f44c9f	955	/* host name already in octet notation? set ip addr and return ERR_OK */
dirkx	0:355018f44c9f	956	ipaddr = ipaddr_addr(hostname);
dirkx	0:355018f44c9f	957	if (ipaddr == IPADDR_NONE) {
dirkx	0:355018f44c9f	958	/* already have this address cached? */
dirkx	0:355018f44c9f	959	ipaddr = dns_lookup(hostname);
dirkx	0:355018f44c9f	960	}
dirkx	0:355018f44c9f	961	if (ipaddr != IPADDR_NONE) {
dirkx	0:355018f44c9f	962	ip4_addr_set_u32(addr, ipaddr);
dirkx	0:355018f44c9f	963	return ERR_OK;
dirkx	0:355018f44c9f	964	}
dirkx	0:355018f44c9f	965
dirkx	0:355018f44c9f	966	/* queue query with specified callback */
dirkx	0:355018f44c9f	967	return dns_enqueue(hostname, found, callback_arg);
dirkx	0:355018f44c9f	968	}
dirkx	0:355018f44c9f	969
dirkx	0:355018f44c9f	970	#endif /* LWIP_DNS */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	21 Jul 2010
Imports:	99
Forks:	0
Commits:	6
Dependents:	0
Dependencies:	1
Followers:	8

lwip/core/dns.c@5:8e53abda9900, 2010-08-14 (annotated)

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