XBeeWiFi_common - EthernetNetIf Compatibility.

Users » ban4jp » Code » XBeeWiFi_common

ban4jp - / XBeeWiFi_common

EthernetNetIf Compatibility.

Dependents: XBeeWiFi_SPI_example

Fork of NetServicesSource by Donatien Garnier

lwip/core/dns.c@2:a4f97773c90f, 2010-06-18 (annotated)

Committer:: donatien
Date:: Fri Jun 18 09:22:54 2010 +0000
Revision:: 2:a4f97773c90f
Parent:: 0:632c9925f013
Child:: 5:dd63a1e02b1b

Who changed what in which revision?

User	Revision	Line number	New contents of line
donatien	2:a4f97773c90f	1	/**
donatien	2:a4f97773c90f	2	* @file
donatien	2:a4f97773c90f	3	* DNS - host name to IP address resolver.
donatien	2:a4f97773c90f	4	*
donatien	2:a4f97773c90f	5	*/
donatien	2:a4f97773c90f	6
donatien	2:a4f97773c90f	7	/**
donatien	2:a4f97773c90f	8
donatien	2:a4f97773c90f	9	* This file implements a DNS host name to IP address resolver.
donatien	2:a4f97773c90f	10
donatien	2:a4f97773c90f	11	* Port to lwIP from uIP
donatien	2:a4f97773c90f	12	* by Jim Pettinato April 2007
donatien	2:a4f97773c90f	13
donatien	2:a4f97773c90f	14	* uIP version Copyright (c) 2002-2003, Adam Dunkels.
donatien	2:a4f97773c90f	15	* All rights reserved.
donatien	2:a4f97773c90f	16	*
donatien	2:a4f97773c90f	17	* Redistribution and use in source and binary forms, with or without
donatien	2:a4f97773c90f	18	* modification, are permitted provided that the following conditions
donatien	2:a4f97773c90f	19	* are met:
donatien	2:a4f97773c90f	20	* 1. Redistributions of source code must retain the above copyright
donatien	2:a4f97773c90f	21	* notice, this list of conditions and the following disclaimer.
donatien	2:a4f97773c90f	22	* 2. Redistributions in binary form must reproduce the above copyright
donatien	2:a4f97773c90f	23	* notice, this list of conditions and the following disclaimer in the
donatien	2:a4f97773c90f	24	* documentation and/or other materials provided with the distribution.
donatien	2:a4f97773c90f	25	* 3. The name of the author may not be used to endorse or promote
donatien	2:a4f97773c90f	26	* products derived from this software without specific prior
donatien	2:a4f97773c90f	27	* written permission.
donatien	2:a4f97773c90f	28	*
donatien	2:a4f97773c90f	29	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
donatien	2:a4f97773c90f	30	* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
donatien	2:a4f97773c90f	31	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
donatien	2:a4f97773c90f	32	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
donatien	2:a4f97773c90f	33	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
donatien	2:a4f97773c90f	34	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
donatien	2:a4f97773c90f	35	* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien	2:a4f97773c90f	36	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
donatien	2:a4f97773c90f	37	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
donatien	2:a4f97773c90f	38	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
donatien	2:a4f97773c90f	39	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
donatien	2:a4f97773c90f	40	*
donatien	2:a4f97773c90f	41	*
donatien	2:a4f97773c90f	42	* DNS.C
donatien	2:a4f97773c90f	43	*
donatien	2:a4f97773c90f	44	* The lwIP DNS resolver functions are used to lookup a host name and
donatien	2:a4f97773c90f	45	* map it to a numerical IP address. It maintains a list of resolved
donatien	2:a4f97773c90f	46	* hostnames that can be queried with the dns_lookup() function.
donatien	2:a4f97773c90f	47	* New hostnames can be resolved using the dns_query() function.
donatien	2:a4f97773c90f	48	*
donatien	2:a4f97773c90f	49	* The lwIP version of the resolver also adds a non-blocking version of
donatien	2:a4f97773c90f	50	* gethostbyname() that will work with a raw API application. This function
donatien	2:a4f97773c90f	51	* checks for an IP address string first and converts it if it is valid.
donatien	2:a4f97773c90f	52	* gethostbyname() then does a dns_lookup() to see if the name is
donatien	2:a4f97773c90f	53	* already in the table. If so, the IP is returned. If not, a query is
donatien	2:a4f97773c90f	54	* issued and the function returns with a ERR_INPROGRESS status. The app
donatien	2:a4f97773c90f	55	* using the dns client must then go into a waiting state.
donatien	2:a4f97773c90f	56	*
donatien	2:a4f97773c90f	57	* Once a hostname has been resolved (or found to be non-existent),
donatien	2:a4f97773c90f	58	* the resolver code calls a specified callback function (which
donatien	2:a4f97773c90f	59	* must be implemented by the module that uses the resolver).
donatien	2:a4f97773c90f	60	*/
donatien	2:a4f97773c90f	61
donatien	2:a4f97773c90f	62	/*-----------------------------------------------------------------------------
donatien	2:a4f97773c90f	63	* RFC 1035 - Domain names - implementation and specification
donatien	2:a4f97773c90f	64	* RFC 2181 - Clarifications to the DNS Specification
donatien	2:a4f97773c90f	65	----------------------------------------------------------------------------/
donatien	2:a4f97773c90f	66
donatien	2:a4f97773c90f	67	/** @todo: define good default values (rfc compliance) */
donatien	2:a4f97773c90f	68	/** @todo: improve answer parsing, more checkings... */
donatien	2:a4f97773c90f	69	/** @todo: check RFC1035 - 7.3. Processing responses */
donatien	2:a4f97773c90f	70
donatien	2:a4f97773c90f	71	/*-----------------------------------------------------------------------------
donatien	2:a4f97773c90f	72	* Includes
donatien	2:a4f97773c90f	73	----------------------------------------------------------------------------/
donatien	2:a4f97773c90f	74
donatien	2:a4f97773c90f	75	#include "lwip/opt.h"
donatien	2:a4f97773c90f	76
donatien	2:a4f97773c90f	77	#if LWIP_DNS /* don't build if not configured for use in lwipopts.h */
donatien	2:a4f97773c90f	78
donatien	2:a4f97773c90f	79	#include "lwip/udp.h"
donatien	2:a4f97773c90f	80	#include "lwip/mem.h"
donatien	2:a4f97773c90f	81	#include "lwip/memp.h"
donatien	2:a4f97773c90f	82	#include "lwip/dns.h"
donatien	2:a4f97773c90f	83	#include "lwip/debug.h"
donatien	2:a4f97773c90f	84
donatien	2:a4f97773c90f	85	#include <string.h>
donatien	2:a4f97773c90f	86
donatien	2:a4f97773c90f	87	/** DNS server IP address */
donatien	2:a4f97773c90f	88	#ifndef DNS_SERVER_ADDRESS
donatien	2:a4f97773c90f	89	#define DNS_SERVER_ADDRESS(ipaddr) (ip4_addr_set_u32(ipaddr, ipaddr_addr("208.67.222.222"))) /* resolver1.opendns.com */
donatien	2:a4f97773c90f	90	#endif
donatien	2:a4f97773c90f	91
donatien	2:a4f97773c90f	92	/** DNS server port address */
donatien	2:a4f97773c90f	93	#ifndef DNS_SERVER_PORT
donatien	2:a4f97773c90f	94	#define DNS_SERVER_PORT 53
donatien	2:a4f97773c90f	95	#endif
donatien	2:a4f97773c90f	96
donatien	2:a4f97773c90f	97	/** DNS maximum number of retries when asking for a name, before "timeout". */
donatien	2:a4f97773c90f	98	#ifndef DNS_MAX_RETRIES
donatien	2:a4f97773c90f	99	#define DNS_MAX_RETRIES 4
donatien	2:a4f97773c90f	100	#endif
donatien	2:a4f97773c90f	101
donatien	2:a4f97773c90f	102	/** DNS resource record max. TTL (one week as default) */
donatien	2:a4f97773c90f	103	#ifndef DNS_MAX_TTL
donatien	2:a4f97773c90f	104	#define DNS_MAX_TTL 604800
donatien	2:a4f97773c90f	105	#endif
donatien	2:a4f97773c90f	106
donatien	2:a4f97773c90f	107	/* DNS protocol flags */
donatien	2:a4f97773c90f	108	#define DNS_FLAG1_RESPONSE 0x80
donatien	2:a4f97773c90f	109	#define DNS_FLAG1_OPCODE_STATUS 0x10
donatien	2:a4f97773c90f	110	#define DNS_FLAG1_OPCODE_INVERSE 0x08
donatien	2:a4f97773c90f	111	#define DNS_FLAG1_OPCODE_STANDARD 0x00
donatien	2:a4f97773c90f	112	#define DNS_FLAG1_AUTHORATIVE 0x04
donatien	2:a4f97773c90f	113	#define DNS_FLAG1_TRUNC 0x02
donatien	2:a4f97773c90f	114	#define DNS_FLAG1_RD 0x01
donatien	2:a4f97773c90f	115	#define DNS_FLAG2_RA 0x80
donatien	2:a4f97773c90f	116	#define DNS_FLAG2_ERR_MASK 0x0f
donatien	2:a4f97773c90f	117	#define DNS_FLAG2_ERR_NONE 0x00
donatien	2:a4f97773c90f	118	#define DNS_FLAG2_ERR_NAME 0x03
donatien	2:a4f97773c90f	119
donatien	2:a4f97773c90f	120	/* DNS protocol states */
donatien	2:a4f97773c90f	121	#define DNS_STATE_UNUSED 0
donatien	2:a4f97773c90f	122	#define DNS_STATE_NEW 1
donatien	2:a4f97773c90f	123	#define DNS_STATE_ASKING 2
donatien	2:a4f97773c90f	124	#define DNS_STATE_DONE 3
donatien	2:a4f97773c90f	125
donatien	2:a4f97773c90f	126	#ifdef PACK_STRUCT_USE_INCLUDES
donatien	2:a4f97773c90f	127	# include "arch/bpstruct.h"
donatien	2:a4f97773c90f	128	#endif
donatien	2:a4f97773c90f	129	PACK_STRUCT_BEGIN
donatien	2:a4f97773c90f	130	/** DNS message header */
donatien	2:a4f97773c90f	131	struct dns_hdr {
donatien	2:a4f97773c90f	132	PACK_STRUCT_FIELD(u16_t id);
donatien	2:a4f97773c90f	133	PACK_STRUCT_FIELD(u8_t flags1);
donatien	2:a4f97773c90f	134	PACK_STRUCT_FIELD(u8_t flags2);
donatien	2:a4f97773c90f	135	PACK_STRUCT_FIELD(u16_t numquestions);
donatien	2:a4f97773c90f	136	PACK_STRUCT_FIELD(u16_t numanswers);
donatien	2:a4f97773c90f	137	PACK_STRUCT_FIELD(u16_t numauthrr);
donatien	2:a4f97773c90f	138	PACK_STRUCT_FIELD(u16_t numextrarr);
donatien	2:a4f97773c90f	139	} PACK_STRUCT_STRUCT;
donatien	2:a4f97773c90f	140	PACK_STRUCT_END
donatien	2:a4f97773c90f	141	#ifdef PACK_STRUCT_USE_INCLUDES
donatien	2:a4f97773c90f	142	# include "arch/epstruct.h"
donatien	2:a4f97773c90f	143	#endif
donatien	2:a4f97773c90f	144	#define SIZEOF_DNS_HDR 12
donatien	2:a4f97773c90f	145
donatien	2:a4f97773c90f	146	/** DNS query message structure.
donatien	2:a4f97773c90f	147	No packing needed: only used locally on the stack. */
donatien	2:a4f97773c90f	148	struct dns_query {
donatien	2:a4f97773c90f	149	/* DNS query record starts with either a domain name or a pointer
donatien	2:a4f97773c90f	150	to a name already present somewhere in the packet. */
donatien	2:a4f97773c90f	151	u16_t type;
donatien	2:a4f97773c90f	152	u16_t cls;
donatien	2:a4f97773c90f	153	};
donatien	2:a4f97773c90f	154	#define SIZEOF_DNS_QUERY 4
donatien	2:a4f97773c90f	155
donatien	2:a4f97773c90f	156	/** DNS answer message structure.
donatien	2:a4f97773c90f	157	No packing needed: only used locally on the stack. */
donatien	2:a4f97773c90f	158	struct dns_answer {
donatien	2:a4f97773c90f	159	/* DNS answer record starts with either a domain name or a pointer
donatien	2:a4f97773c90f	160	to a name already present somewhere in the packet. */
donatien	2:a4f97773c90f	161	u16_t type;
donatien	2:a4f97773c90f	162	u16_t cls;
donatien	2:a4f97773c90f	163	u32_t ttl;
donatien	2:a4f97773c90f	164	u16_t len;
donatien	2:a4f97773c90f	165	};
donatien	2:a4f97773c90f	166	#define SIZEOF_DNS_ANSWER 10
donatien	2:a4f97773c90f	167
donatien	2:a4f97773c90f	168	/** DNS table entry */
donatien	2:a4f97773c90f	169	struct dns_table_entry {
donatien	2:a4f97773c90f	170	u8_t state;
donatien	2:a4f97773c90f	171	u8_t numdns;
donatien	2:a4f97773c90f	172	u8_t tmr;
donatien	2:a4f97773c90f	173	u8_t retries;
donatien	2:a4f97773c90f	174	u8_t seqno;
donatien	2:a4f97773c90f	175	u8_t err;
donatien	2:a4f97773c90f	176	u32_t ttl;
donatien	2:a4f97773c90f	177	char name[DNS_MAX_NAME_LENGTH];
donatien	2:a4f97773c90f	178	ip_addr_t ipaddr;
donatien	2:a4f97773c90f	179	/* pointer to callback on DNS query done */
donatien	2:a4f97773c90f	180	dns_found_callback found;
donatien	2:a4f97773c90f	181	void *arg;
donatien	2:a4f97773c90f	182	};
donatien	2:a4f97773c90f	183
donatien	2:a4f97773c90f	184	#if DNS_LOCAL_HOSTLIST
donatien	2:a4f97773c90f	185
donatien	2:a4f97773c90f	186	#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
donatien	2:a4f97773c90f	187	/** Local host-list. For hostnames in this list, no
donatien	2:a4f97773c90f	188	* external name resolution is performed */
donatien	2:a4f97773c90f	189	static struct local_hostlist_entry *local_hostlist_dynamic;
donatien	2:a4f97773c90f	190	#else /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
donatien	2:a4f97773c90f	191
donatien	2:a4f97773c90f	192	/** Defining this allows the local_hostlist_static to be placed in a different
donatien	2:a4f97773c90f	193	* linker section (e.g. FLASH) */
donatien	2:a4f97773c90f	194	#ifndef DNS_LOCAL_HOSTLIST_STORAGE_PRE
donatien	2:a4f97773c90f	195	#define DNS_LOCAL_HOSTLIST_STORAGE_PRE static
donatien	2:a4f97773c90f	196	#endif /* DNS_LOCAL_HOSTLIST_STORAGE_PRE */
donatien	2:a4f97773c90f	197	/** Defining this allows the local_hostlist_static to be placed in a different
donatien	2:a4f97773c90f	198	* linker section (e.g. FLASH) */
donatien	2:a4f97773c90f	199	#ifndef DNS_LOCAL_HOSTLIST_STORAGE_POST
donatien	2:a4f97773c90f	200	#define DNS_LOCAL_HOSTLIST_STORAGE_POST
donatien	2:a4f97773c90f	201	#endif /* DNS_LOCAL_HOSTLIST_STORAGE_POST */
donatien	2:a4f97773c90f	202	DNS_LOCAL_HOSTLIST_STORAGE_PRE struct local_hostlist_entry local_hostlist_static[]
donatien	2:a4f97773c90f	203	DNS_LOCAL_HOSTLIST_STORAGE_POST = DNS_LOCAL_HOSTLIST_INIT;
donatien	2:a4f97773c90f	204
donatien	2:a4f97773c90f	205	#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
donatien	2:a4f97773c90f	206
donatien	2:a4f97773c90f	207	static void dns_init_local();
donatien	2:a4f97773c90f	208	#endif /* DNS_LOCAL_HOSTLIST */
donatien	2:a4f97773c90f	209
donatien	2:a4f97773c90f	210
donatien	2:a4f97773c90f	211	/* forward declarations */
donatien	2:a4f97773c90f	212	static void dns_recv(void s, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port);
donatien	2:a4f97773c90f	213	static void dns_check_entries(void);
donatien	2:a4f97773c90f	214
donatien	2:a4f97773c90f	215	/*-----------------------------------------------------------------------------
donatien	2:a4f97773c90f	216	* Globales
donatien	2:a4f97773c90f	217	----------------------------------------------------------------------------/
donatien	2:a4f97773c90f	218
donatien	2:a4f97773c90f	219	/* DNS variables */
donatien	2:a4f97773c90f	220	static struct udp_pcb *dns_pcb;
donatien	2:a4f97773c90f	221	static u8_t dns_seqno;
donatien	2:a4f97773c90f	222	static struct dns_table_entry dns_table[DNS_TABLE_SIZE];
donatien	2:a4f97773c90f	223	static ip_addr_t dns_servers[DNS_MAX_SERVERS];
donatien	2:a4f97773c90f	224	/** Contiguous buffer for processing responses */
donatien	2:a4f97773c90f	225	static u8_t dns_payload_buffer[LWIP_MEM_ALIGN_BUFFER(DNS_MSG_SIZE)];
donatien	2:a4f97773c90f	226	static u8_t* dns_payload;
donatien	2:a4f97773c90f	227
donatien	2:a4f97773c90f	228	/**
donatien	2:a4f97773c90f	229	* Initialize the resolver: set up the UDP pcb and configure the default server
donatien	2:a4f97773c90f	230	* (DNS_SERVER_ADDRESS).
donatien	2:a4f97773c90f	231	*/
donatien	2:a4f97773c90f	232	void
donatien	2:a4f97773c90f	233	dns_init()
donatien	2:a4f97773c90f	234	{
donatien	2:a4f97773c90f	235	ip_addr_t dnsserver;
donatien	2:a4f97773c90f	236
donatien	2:a4f97773c90f	237	dns_payload = (u8_t *)LWIP_MEM_ALIGN(dns_payload_buffer);
donatien	2:a4f97773c90f	238
donatien	2:a4f97773c90f	239	/* initialize default DNS server address */
donatien	2:a4f97773c90f	240	DNS_SERVER_ADDRESS(&dnsserver);
donatien	2:a4f97773c90f	241
donatien	2:a4f97773c90f	242	LWIP_DEBUGF(DNS_DEBUG, ("dns_init: initializing\n"));
donatien	2:a4f97773c90f	243
donatien	2:a4f97773c90f	244	/* if dns client not yet initialized... */
donatien	2:a4f97773c90f	245	if (dns_pcb == NULL) {
donatien	2:a4f97773c90f	246	dns_pcb = udp_new();
donatien	2:a4f97773c90f	247
donatien	2:a4f97773c90f	248	if (dns_pcb != NULL) {
donatien	2:a4f97773c90f	249	/* initialize DNS table not needed (initialized to zero since it is a
donatien	2:a4f97773c90f	250	* global variable) */
donatien	2:a4f97773c90f	251	LWIP_ASSERT("For implicit initialization to work, DNS_STATE_UNUSED needs to be 0",
donatien	2:a4f97773c90f	252	DNS_STATE_UNUSED == 0);
donatien	2:a4f97773c90f	253
donatien	2:a4f97773c90f	254	/* initialize DNS client */
donatien	2:a4f97773c90f	255	udp_bind(dns_pcb, IP_ADDR_ANY, 0);
donatien	2:a4f97773c90f	256	udp_recv(dns_pcb, dns_recv, NULL);
donatien	2:a4f97773c90f	257
donatien	2:a4f97773c90f	258	/* initialize default DNS primary server */
donatien	2:a4f97773c90f	259	dns_setserver(0, &dnsserver);
donatien	2:a4f97773c90f	260	}
donatien	2:a4f97773c90f	261	}
donatien	2:a4f97773c90f	262	#if DNS_LOCAL_HOSTLIST
donatien	2:a4f97773c90f	263	dns_init_local();
donatien	2:a4f97773c90f	264	#endif
donatien	2:a4f97773c90f	265	}
donatien	2:a4f97773c90f	266
donatien	2:a4f97773c90f	267	/**
donatien	2:a4f97773c90f	268	* Initialize one of the DNS servers.
donatien	2:a4f97773c90f	269	*
donatien	2:a4f97773c90f	270	* @param numdns the index of the DNS server to set must be < DNS_MAX_SERVERS
donatien	2:a4f97773c90f	271	* @param dnsserver IP address of the DNS server to set
donatien	2:a4f97773c90f	272	*/
donatien	2:a4f97773c90f	273	void
donatien	2:a4f97773c90f	274	dns_setserver(u8_t numdns, ip_addr_t *dnsserver)
donatien	2:a4f97773c90f	275	{
donatien	2:a4f97773c90f	276	if ((numdns < DNS_MAX_SERVERS) && (dns_pcb != NULL) &&
donatien	2:a4f97773c90f	277	(dnsserver != NULL) && !ip_addr_isany(dnsserver)) {
donatien	2:a4f97773c90f	278	dns_servers[numdns] = (*dnsserver);
donatien	2:a4f97773c90f	279	}
donatien	2:a4f97773c90f	280	}
donatien	2:a4f97773c90f	281
donatien	2:a4f97773c90f	282	/**
donatien	2:a4f97773c90f	283	* Obtain one of the currently configured DNS server.
donatien	2:a4f97773c90f	284	*
donatien	2:a4f97773c90f	285	* @param numdns the index of the DNS server
donatien	2:a4f97773c90f	286	* @return IP address of the indexed DNS server or "ip_addr_any" if the DNS
donatien	2:a4f97773c90f	287	* server has not been configured.
donatien	2:a4f97773c90f	288	*/
donatien	2:a4f97773c90f	289	ip_addr_t
donatien	2:a4f97773c90f	290	dns_getserver(u8_t numdns)
donatien	2:a4f97773c90f	291	{
donatien	2:a4f97773c90f	292	if (numdns < DNS_MAX_SERVERS) {
donatien	2:a4f97773c90f	293	return dns_servers[numdns];
donatien	2:a4f97773c90f	294	} else {
donatien	2:a4f97773c90f	295	return *IP_ADDR_ANY;
donatien	2:a4f97773c90f	296	}
donatien	2:a4f97773c90f	297	}
donatien	2:a4f97773c90f	298
donatien	2:a4f97773c90f	299	/**
donatien	2:a4f97773c90f	300	* The DNS resolver client timer - handle retries and timeouts and should
donatien	2:a4f97773c90f	301	* be called every DNS_TMR_INTERVAL milliseconds (every second by default).
donatien	2:a4f97773c90f	302	*/
donatien	2:a4f97773c90f	303	void
donatien	2:a4f97773c90f	304	dns_tmr(void)
donatien	2:a4f97773c90f	305	{
donatien	2:a4f97773c90f	306	if (dns_pcb != NULL) {
donatien	2:a4f97773c90f	307	LWIP_DEBUGF(DNS_DEBUG, ("dns_tmr: dns_check_entries\n"));
donatien	2:a4f97773c90f	308	dns_check_entries();
donatien	2:a4f97773c90f	309	}
donatien	2:a4f97773c90f	310	}
donatien	2:a4f97773c90f	311
donatien	2:a4f97773c90f	312	#if DNS_LOCAL_HOSTLIST
donatien	2:a4f97773c90f	313	static void
donatien	2:a4f97773c90f	314	dns_init_local()
donatien	2:a4f97773c90f	315	{
donatien	2:a4f97773c90f	316	#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC && defined(DNS_LOCAL_HOSTLIST_INIT)
donatien	2:a4f97773c90f	317	int i;
donatien	2:a4f97773c90f	318	struct local_hostlist_entry *entry;
donatien	2:a4f97773c90f	319	/* Dynamic: copy entries from DNS_LOCAL_HOSTLIST_INIT to list */
donatien	2:a4f97773c90f	320	struct local_hostlist_entry local_hostlist_init[] = DNS_LOCAL_HOSTLIST_INIT;
donatien	2:a4f97773c90f	321	size_t namelen;
donatien	2:a4f97773c90f	322	for (i = 0; i < sizeof(local_hostlist_init) / sizeof(struct local_hostlist_entry); i++) {
donatien	2:a4f97773c90f	323	struct local_hostlist_entry *init_entry = &local_hostlist_init[i];
donatien	2:a4f97773c90f	324	LWIP_ASSERT("invalid host name (NULL)", init_entry->name != NULL);
donatien	2:a4f97773c90f	325	namelen = strlen(init_entry->name);
donatien	2:a4f97773c90f	326	LWIP_ASSERT("namelen <= DNS_LOCAL_HOSTLIST_MAX_NAMELEN", namelen <= DNS_LOCAL_HOSTLIST_MAX_NAMELEN);
donatien	2:a4f97773c90f	327	entry = (struct local_hostlist_entry *)memp_malloc(MEMP_LOCALHOSTLIST);
donatien	2:a4f97773c90f	328	LWIP_ASSERT("mem-error in dns_init_local", entry != NULL);
donatien	2:a4f97773c90f	329	if (entry != NULL) {
donatien	2:a4f97773c90f	330	entry->name = (char*)entry + sizeof(struct local_hostlist_entry);
donatien	2:a4f97773c90f	331	MEMCPY((char*)entry->name, init_entry->name, namelen);
donatien	2:a4f97773c90f	332	((char*)entry->name)[namelen] = 0;
donatien	2:a4f97773c90f	333	entry->addr = init_entry->addr;
donatien	2:a4f97773c90f	334	entry->next = local_hostlist_dynamic;
donatien	2:a4f97773c90f	335	local_hostlist_dynamic = entry;
donatien	2:a4f97773c90f	336	}
donatien	2:a4f97773c90f	337	}
donatien	2:a4f97773c90f	338	#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC && defined(DNS_LOCAL_HOSTLIST_INIT) */
donatien	2:a4f97773c90f	339	}
donatien	2:a4f97773c90f	340
donatien	2:a4f97773c90f	341	/**
donatien	2:a4f97773c90f	342	* Scans the local host-list for a hostname.
donatien	2:a4f97773c90f	343	*
donatien	2:a4f97773c90f	344	* @param hostname Hostname to look for in the local host-list
donatien	2:a4f97773c90f	345	* @return The first IP address for the hostname in the local host-list or
donatien	2:a4f97773c90f	346	* IPADDR_NONE if not found.
donatien	2:a4f97773c90f	347	*/
donatien	2:a4f97773c90f	348	static u32_t
donatien	2:a4f97773c90f	349	dns_lookup_local(const char *hostname)
donatien	2:a4f97773c90f	350	{
donatien	2:a4f97773c90f	351	#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
donatien	2:a4f97773c90f	352	struct local_hostlist_entry *entry = local_hostlist_dynamic;
donatien	2:a4f97773c90f	353	while(entry != NULL) {
donatien	2:a4f97773c90f	354	if(strcmp(entry->name, hostname) == 0) {
donatien	2:a4f97773c90f	355	return ip4_addr_get_u32(&entry->addr);
donatien	2:a4f97773c90f	356	}
donatien	2:a4f97773c90f	357	entry = entry->next;
donatien	2:a4f97773c90f	358	}
donatien	2:a4f97773c90f	359	#else /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
donatien	2:a4f97773c90f	360	int i;
donatien	2:a4f97773c90f	361	for (i = 0; i < sizeof(local_hostlist_static) / sizeof(struct local_hostlist_entry); i++) {
donatien	2:a4f97773c90f	362	if(strcmp(local_hostlist_static[i].name, hostname) == 0) {
donatien	2:a4f97773c90f	363	return ip4_addr_get_u32(&local_hostlist_static[i].addr);
donatien	2:a4f97773c90f	364	}
donatien	2:a4f97773c90f	365	}
donatien	2:a4f97773c90f	366	#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
donatien	2:a4f97773c90f	367	return IPADDR_NONE;
donatien	2:a4f97773c90f	368	}
donatien	2:a4f97773c90f	369
donatien	2:a4f97773c90f	370	#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
donatien	2:a4f97773c90f	371	/** Remove all entries from the local host-list for a specific hostname
donatien	2:a4f97773c90f	372	* and/or IP addess
donatien	2:a4f97773c90f	373	*
donatien	2:a4f97773c90f	374	* @param hostname hostname for which entries shall be removed from the local
donatien	2:a4f97773c90f	375	* host-list
donatien	2:a4f97773c90f	376	* @param addr address for which entries shall be removed from the local host-list
donatien	2:a4f97773c90f	377	* @return the number of removed entries
donatien	2:a4f97773c90f	378	*/
donatien	2:a4f97773c90f	379	int
donatien	2:a4f97773c90f	380	dns_local_removehost(const char hostname, const ip_addr_t addr)
donatien	2:a4f97773c90f	381	{
donatien	2:a4f97773c90f	382	int removed = 0;
donatien	2:a4f97773c90f	383	struct local_hostlist_entry *entry = local_hostlist_dynamic;
donatien	2:a4f97773c90f	384	struct local_hostlist_entry *last_entry = NULL;
donatien	2:a4f97773c90f	385	while (entry != NULL) {
donatien	2:a4f97773c90f	386	if (((hostname == NULL) \|\| !strcmp(entry->name, hostname)) &&
donatien	2:a4f97773c90f	387	((addr == NULL) \|\| ip_addr_cmp(&entry->addr, addr))) {
donatien	2:a4f97773c90f	388	struct local_hostlist_entry *free_entry;
donatien	2:a4f97773c90f	389	if (last_entry != NULL) {
donatien	2:a4f97773c90f	390	last_entry->next = entry->next;
donatien	2:a4f97773c90f	391	} else {
donatien	2:a4f97773c90f	392	local_hostlist_dynamic = entry->next;
donatien	2:a4f97773c90f	393	}
donatien	2:a4f97773c90f	394	free_entry = entry;
donatien	2:a4f97773c90f	395	entry = entry->next;
donatien	2:a4f97773c90f	396	memp_free(MEMP_LOCALHOSTLIST, free_entry);
donatien	2:a4f97773c90f	397	removed++;
donatien	2:a4f97773c90f	398	} else {
donatien	2:a4f97773c90f	399	last_entry = entry;
donatien	2:a4f97773c90f	400	entry = entry->next;
donatien	2:a4f97773c90f	401	}
donatien	2:a4f97773c90f	402	}
donatien	2:a4f97773c90f	403	return removed;
donatien	2:a4f97773c90f	404	}
donatien	2:a4f97773c90f	405
donatien	2:a4f97773c90f	406	/**
donatien	2:a4f97773c90f	407	* Add a hostname/IP address pair to the local host-list.
donatien	2:a4f97773c90f	408	* Duplicates are not checked.
donatien	2:a4f97773c90f	409	*
donatien	2:a4f97773c90f	410	* @param hostname hostname of the new entry
donatien	2:a4f97773c90f	411	* @param addr IP address of the new entry
donatien	2:a4f97773c90f	412	* @return ERR_OK if succeeded or ERR_MEM on memory error
donatien	2:a4f97773c90f	413	*/
donatien	2:a4f97773c90f	414	err_t
donatien	2:a4f97773c90f	415	dns_local_addhost(const char hostname, const ip_addr_t addr)
donatien	2:a4f97773c90f	416	{
donatien	2:a4f97773c90f	417	struct local_hostlist_entry *entry;
donatien	2:a4f97773c90f	418	size_t namelen;
donatien	2:a4f97773c90f	419	LWIP_ASSERT("invalid host name (NULL)", hostname != NULL);
donatien	2:a4f97773c90f	420	namelen = strlen(hostname);
donatien	2:a4f97773c90f	421	LWIP_ASSERT("namelen <= DNS_LOCAL_HOSTLIST_MAX_NAMELEN", namelen <= DNS_LOCAL_HOSTLIST_MAX_NAMELEN);
donatien	2:a4f97773c90f	422	entry = (struct local_hostlist_entry *)memp_malloc(MEMP_LOCALHOSTLIST);
donatien	2:a4f97773c90f	423	if (entry == NULL) {
donatien	2:a4f97773c90f	424	return ERR_MEM;
donatien	2:a4f97773c90f	425	}
donatien	2:a4f97773c90f	426	entry->name = (char*)entry + sizeof(struct local_hostlist_entry);
donatien	2:a4f97773c90f	427	MEMCPY((char*)entry->name, hostname, namelen);
donatien	2:a4f97773c90f	428	((char*)entry->name)[namelen] = 0;
donatien	2:a4f97773c90f	429	ip_addr_copy(entry->addr, *addr);
donatien	2:a4f97773c90f	430	entry->next = local_hostlist_dynamic;
donatien	2:a4f97773c90f	431	local_hostlist_dynamic = entry;
donatien	2:a4f97773c90f	432	return ERR_OK;
donatien	2:a4f97773c90f	433	}
donatien	2:a4f97773c90f	434	#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC*/
donatien	2:a4f97773c90f	435	#endif /* DNS_LOCAL_HOSTLIST */
donatien	2:a4f97773c90f	436
donatien	2:a4f97773c90f	437	/**
donatien	2:a4f97773c90f	438	* Look up a hostname in the array of known hostnames.
donatien	2:a4f97773c90f	439	*
donatien	2:a4f97773c90f	440	* @note This function only looks in the internal array of known
donatien	2:a4f97773c90f	441	* hostnames, it does not send out a query for the hostname if none
donatien	2:a4f97773c90f	442	* was found. The function dns_enqueue() can be used to send a query
donatien	2:a4f97773c90f	443	* for a hostname.
donatien	2:a4f97773c90f	444	*
donatien	2:a4f97773c90f	445	* @param name the hostname to look up
donatien	2:a4f97773c90f	446	* @return the hostname's IP address, as u32_t (instead of ip_addr_t to
donatien	2:a4f97773c90f	447	* better check for failure: != IPADDR_NONE) or IPADDR_NONE if the hostname
donatien	2:a4f97773c90f	448	* was not found in the cached dns_table.
donatien	2:a4f97773c90f	449	*/
donatien	2:a4f97773c90f	450	static u32_t
donatien	2:a4f97773c90f	451	dns_lookup(const char *name)
donatien	2:a4f97773c90f	452	{
donatien	2:a4f97773c90f	453	u8_t i;
donatien	2:a4f97773c90f	454	#if DNS_LOCAL_HOSTLIST \|\| defined(DNS_LOOKUP_LOCAL_EXTERN)
donatien	2:a4f97773c90f	455	u32_t addr;
donatien	2:a4f97773c90f	456	#endif /* DNS_LOCAL_HOSTLIST \|\| defined(DNS_LOOKUP_LOCAL_EXTERN) */
donatien	2:a4f97773c90f	457	#if DNS_LOCAL_HOSTLIST
donatien	2:a4f97773c90f	458	if ((addr = dns_lookup_local(name)) != IPADDR_NONE) {
donatien	2:a4f97773c90f	459	return addr;
donatien	2:a4f97773c90f	460	}
donatien	2:a4f97773c90f	461	#endif /* DNS_LOCAL_HOSTLIST */
donatien	2:a4f97773c90f	462	#ifdef DNS_LOOKUP_LOCAL_EXTERN
donatien	2:a4f97773c90f	463	if((addr = DNS_LOOKUP_LOCAL_EXTERN(name)) != IPADDR_NONE) {
donatien	2:a4f97773c90f	464	return addr;
donatien	2:a4f97773c90f	465	}
donatien	2:a4f97773c90f	466	#endif /* DNS_LOOKUP_LOCAL_EXTERN */
donatien	2:a4f97773c90f	467
donatien	2:a4f97773c90f	468	/* Walk through name list, return entry if found. If not, return NULL. */
donatien	2:a4f97773c90f	469	for (i = 0; i < DNS_TABLE_SIZE; ++i) {
donatien	2:a4f97773c90f	470	if ((dns_table[i].state == DNS_STATE_DONE) &&
donatien	2:a4f97773c90f	471	(strcmp(name, dns_table[i].name) == 0)) {
donatien	2:a4f97773c90f	472	LWIP_DEBUGF(DNS_DEBUG, ("dns_lookup: \"%s\": found = ", name));
donatien	2:a4f97773c90f	473	ip_addr_debug_print(DNS_DEBUG, &(dns_table[i].ipaddr));
donatien	2:a4f97773c90f	474	LWIP_DEBUGF(DNS_DEBUG, ("\n"));
donatien	2:a4f97773c90f	475	return ip4_addr_get_u32(&dns_table[i].ipaddr);
donatien	2:a4f97773c90f	476	}
donatien	2:a4f97773c90f	477	}
donatien	2:a4f97773c90f	478
donatien	2:a4f97773c90f	479	return IPADDR_NONE;
donatien	2:a4f97773c90f	480	}
donatien	2:a4f97773c90f	481
donatien	2:a4f97773c90f	482	#if DNS_DOES_NAME_CHECK
donatien	2:a4f97773c90f	483	/**
donatien	2:a4f97773c90f	484	* Compare the "dotted" name "query" with the encoded name "response"
donatien	2:a4f97773c90f	485	* to make sure an answer from the DNS server matches the current dns_table
donatien	2:a4f97773c90f	486	* entry (otherwise, answers might arrive late for hostname not on the list
donatien	2:a4f97773c90f	487	* any more).
donatien	2:a4f97773c90f	488	*
donatien	2:a4f97773c90f	489	* @param query hostname (not encoded) from the dns_table
donatien	2:a4f97773c90f	490	* @param response encoded hostname in the DNS response
donatien	2:a4f97773c90f	491	* @return 0: names equal; 1: names differ
donatien	2:a4f97773c90f	492	*/
donatien	2:a4f97773c90f	493	static u8_t
donatien	2:a4f97773c90f	494	dns_compare_name(unsigned char query, unsigned char response)
donatien	2:a4f97773c90f	495	{
donatien	2:a4f97773c90f	496	unsigned char n;
donatien	2:a4f97773c90f	497
donatien	2:a4f97773c90f	498	do {
donatien	2:a4f97773c90f	499	n = *response++;
donatien	2:a4f97773c90f	500	/** @see RFC 1035 - 4.1.4. Message compression */
donatien	2:a4f97773c90f	501	if ((n & 0xc0) == 0xc0) {
donatien	2:a4f97773c90f	502	/* Compressed name */
donatien	2:a4f97773c90f	503	break;
donatien	2:a4f97773c90f	504	} else {
donatien	2:a4f97773c90f	505	/* Not compressed name */
donatien	2:a4f97773c90f	506	while (n > 0) {
donatien	2:a4f97773c90f	507	if ((query) != (response)) {
donatien	2:a4f97773c90f	508	return 1;
donatien	2:a4f97773c90f	509	}
donatien	2:a4f97773c90f	510	++response;
donatien	2:a4f97773c90f	511	++query;
donatien	2:a4f97773c90f	512	--n;
donatien	2:a4f97773c90f	513	};
donatien	2:a4f97773c90f	514	++query;
donatien	2:a4f97773c90f	515	}
donatien	2:a4f97773c90f	516	} while (*response != 0);
donatien	2:a4f97773c90f	517
donatien	2:a4f97773c90f	518	return 0;
donatien	2:a4f97773c90f	519	}
donatien	2:a4f97773c90f	520	#endif /* DNS_DOES_NAME_CHECK */
donatien	2:a4f97773c90f	521
donatien	2:a4f97773c90f	522	/**
donatien	2:a4f97773c90f	523	* Walk through a compact encoded DNS name and return the end of the name.
donatien	2:a4f97773c90f	524	*
donatien	2:a4f97773c90f	525	* @param query encoded DNS name in the DNS server response
donatien	2:a4f97773c90f	526	* @return end of the name
donatien	2:a4f97773c90f	527	*/
donatien	2:a4f97773c90f	528	static unsigned char *
donatien	2:a4f97773c90f	529	dns_parse_name(unsigned char *query)
donatien	2:a4f97773c90f	530	{
donatien	2:a4f97773c90f	531	unsigned char n;
donatien	2:a4f97773c90f	532
donatien	2:a4f97773c90f	533	do {
donatien	2:a4f97773c90f	534	n = *query++;
donatien	2:a4f97773c90f	535	/** @see RFC 1035 - 4.1.4. Message compression */
donatien	2:a4f97773c90f	536	if ((n & 0xc0) == 0xc0) {
donatien	2:a4f97773c90f	537	/* Compressed name */
donatien	2:a4f97773c90f	538	break;
donatien	2:a4f97773c90f	539	} else {
donatien	2:a4f97773c90f	540	/* Not compressed name */
donatien	2:a4f97773c90f	541	while (n > 0) {
donatien	2:a4f97773c90f	542	++query;
donatien	2:a4f97773c90f	543	--n;
donatien	2:a4f97773c90f	544	};
donatien	2:a4f97773c90f	545	}
donatien	2:a4f97773c90f	546	} while (*query != 0);
donatien	2:a4f97773c90f	547
donatien	2:a4f97773c90f	548	return query + 1;
donatien	2:a4f97773c90f	549	}
donatien	2:a4f97773c90f	550
donatien	2:a4f97773c90f	551	/**
donatien	2:a4f97773c90f	552	* Send a DNS query packet.
donatien	2:a4f97773c90f	553	*
donatien	2:a4f97773c90f	554	* @param numdns index of the DNS server in the dns_servers table
donatien	2:a4f97773c90f	555	* @param name hostname to query
donatien	2:a4f97773c90f	556	* @param id index of the hostname in dns_table, used as transaction ID in the
donatien	2:a4f97773c90f	557	* DNS query packet
donatien	2:a4f97773c90f	558	* @return ERR_OK if packet is sent; an err_t indicating the problem otherwise
donatien	2:a4f97773c90f	559	*/
donatien	2:a4f97773c90f	560	static err_t
donatien	2:a4f97773c90f	561	dns_send(u8_t numdns, const char* name, u8_t id)
donatien	2:a4f97773c90f	562	{
donatien	2:a4f97773c90f	563	err_t err;
donatien	2:a4f97773c90f	564	struct dns_hdr *hdr;
donatien	2:a4f97773c90f	565	struct dns_query qry;
donatien	2:a4f97773c90f	566	struct pbuf *p;
donatien	2:a4f97773c90f	567	char query, nptr;
donatien	2:a4f97773c90f	568	const char *pHostname;
donatien	2:a4f97773c90f	569	u8_t n;
donatien	2:a4f97773c90f	570
donatien	2:a4f97773c90f	571	LWIP_DEBUGF(DNS_DEBUG, ("dns_send: dns_servers[%"U16_F"] \"%s\": request\n",
donatien	2:a4f97773c90f	572	(u16_t)(numdns), name));
donatien	2:a4f97773c90f	573	LWIP_ASSERT("dns server out of array", numdns < DNS_MAX_SERVERS);
donatien	2:a4f97773c90f	574	LWIP_ASSERT("dns server has no IP address set", !ip_addr_isany(&dns_servers[numdns]));
donatien	2:a4f97773c90f	575
donatien	2:a4f97773c90f	576	/* if here, we have either a new query or a retry on a previous query to process */
donatien	2:a4f97773c90f	577	p = pbuf_alloc(PBUF_TRANSPORT, SIZEOF_DNS_HDR + DNS_MAX_NAME_LENGTH +
donatien	2:a4f97773c90f	578	SIZEOF_DNS_QUERY, PBUF_RAM);
donatien	2:a4f97773c90f	579	if (p != NULL) {
donatien	2:a4f97773c90f	580	LWIP_ASSERT("pbuf must be in one piece", p->next == NULL);
donatien	2:a4f97773c90f	581	/* fill dns header */
donatien	2:a4f97773c90f	582	hdr = (struct dns_hdr*)p->payload;
donatien	2:a4f97773c90f	583	memset(hdr, 0, SIZEOF_DNS_HDR);
donatien	2:a4f97773c90f	584	hdr->id = htons(id);
donatien	2:a4f97773c90f	585	hdr->flags1 = DNS_FLAG1_RD;
donatien	2:a4f97773c90f	586	hdr->numquestions = PP_HTONS(1);
donatien	2:a4f97773c90f	587	query = (char*)hdr + SIZEOF_DNS_HDR;
donatien	2:a4f97773c90f	588	pHostname = name;
donatien	2:a4f97773c90f	589	--pHostname;
donatien	2:a4f97773c90f	590
donatien	2:a4f97773c90f	591	/* convert hostname into suitable query format. */
donatien	2:a4f97773c90f	592	do {
donatien	2:a4f97773c90f	593	++pHostname;
donatien	2:a4f97773c90f	594	nptr = query;
donatien	2:a4f97773c90f	595	++query;
donatien	2:a4f97773c90f	596	for(n = 0; pHostname != '.' && pHostname != 0; ++pHostname) {
donatien	2:a4f97773c90f	597	query = pHostname;
donatien	2:a4f97773c90f	598	++query;
donatien	2:a4f97773c90f	599	++n;
donatien	2:a4f97773c90f	600	}
donatien	2:a4f97773c90f	601	*nptr = n;
donatien	2:a4f97773c90f	602	} while(*pHostname != 0);
donatien	2:a4f97773c90f	603	*query++='\0';
donatien	2:a4f97773c90f	604
donatien	2:a4f97773c90f	605	/* fill dns query */
donatien	2:a4f97773c90f	606	qry.type = PP_HTONS(DNS_RRTYPE_A);
donatien	2:a4f97773c90f	607	qry.cls = PP_HTONS(DNS_RRCLASS_IN);
donatien	2:a4f97773c90f	608	SMEMCPY(query, &qry, SIZEOF_DNS_QUERY);
donatien	2:a4f97773c90f	609
donatien	2:a4f97773c90f	610	/* resize pbuf to the exact dns query */
donatien	2:a4f97773c90f	611	pbuf_realloc(p, (u16_t)((query + SIZEOF_DNS_QUERY) - ((char*)(p->payload))));
donatien	2:a4f97773c90f	612
donatien	2:a4f97773c90f	613	/* connect to the server for faster receiving */
donatien	2:a4f97773c90f	614	udp_connect(dns_pcb, &dns_servers[numdns], DNS_SERVER_PORT);
donatien	2:a4f97773c90f	615	/* send dns packet */
donatien	2:a4f97773c90f	616	err = udp_sendto(dns_pcb, p, &dns_servers[numdns], DNS_SERVER_PORT);
donatien	2:a4f97773c90f	617
donatien	2:a4f97773c90f	618	/* free pbuf */
donatien	2:a4f97773c90f	619	pbuf_free(p);
donatien	2:a4f97773c90f	620	} else {
donatien	2:a4f97773c90f	621	err = ERR_MEM;
donatien	2:a4f97773c90f	622	}
donatien	2:a4f97773c90f	623
donatien	2:a4f97773c90f	624	return err;
donatien	2:a4f97773c90f	625	}
donatien	2:a4f97773c90f	626
donatien	2:a4f97773c90f	627	/**
donatien	2:a4f97773c90f	628	* dns_check_entry() - see if pEntry has not yet been queried and, if so, sends out a query.
donatien	2:a4f97773c90f	629	* Check an entry in the dns_table:
donatien	2:a4f97773c90f	630	* - send out query for new entries
donatien	2:a4f97773c90f	631	* - retry old pending entries on timeout (also with different servers)
donatien	2:a4f97773c90f	632	* - remove completed entries from the table if their TTL has expired
donatien	2:a4f97773c90f	633	*
donatien	2:a4f97773c90f	634	* @param i index of the dns_table entry to check
donatien	2:a4f97773c90f	635	*/
donatien	2:a4f97773c90f	636	static void
donatien	2:a4f97773c90f	637	dns_check_entry(u8_t i)
donatien	2:a4f97773c90f	638	{
donatien	2:a4f97773c90f	639	err_t err;
donatien	2:a4f97773c90f	640	struct dns_table_entry *pEntry = &dns_table[i];
donatien	2:a4f97773c90f	641
donatien	2:a4f97773c90f	642	LWIP_ASSERT("array index out of bounds", i < DNS_TABLE_SIZE);
donatien	2:a4f97773c90f	643
donatien	2:a4f97773c90f	644	switch(pEntry->state) {
donatien	2:a4f97773c90f	645
donatien	2:a4f97773c90f	646	case DNS_STATE_NEW: {
donatien	2:a4f97773c90f	647	/* initialize new entry */
donatien	2:a4f97773c90f	648	pEntry->state = DNS_STATE_ASKING;
donatien	2:a4f97773c90f	649	pEntry->numdns = 0;
donatien	2:a4f97773c90f	650	pEntry->tmr = 1;
donatien	2:a4f97773c90f	651	pEntry->retries = 0;
donatien	2:a4f97773c90f	652
donatien	2:a4f97773c90f	653	/* send DNS packet for this entry */
donatien	2:a4f97773c90f	654	err = dns_send(pEntry->numdns, pEntry->name, i);
donatien	2:a4f97773c90f	655	if (err != ERR_OK) {
donatien	2:a4f97773c90f	656	LWIP_DEBUGF(DNS_DEBUG \| LWIP_DBG_LEVEL_WARNING,
donatien	2:a4f97773c90f	657	("dns_send returned error: %d\n", err));
donatien	2:a4f97773c90f	658	}
donatien	2:a4f97773c90f	659	break;
donatien	2:a4f97773c90f	660	}
donatien	2:a4f97773c90f	661
donatien	2:a4f97773c90f	662	case DNS_STATE_ASKING: {
donatien	2:a4f97773c90f	663	if (--pEntry->tmr == 0) {
donatien	2:a4f97773c90f	664	if (++pEntry->retries == DNS_MAX_RETRIES) {
donatien	2:a4f97773c90f	665	if ((pEntry->numdns+1<DNS_MAX_SERVERS) && !ip_addr_isany(&dns_servers[pEntry->numdns+1])) {
donatien	2:a4f97773c90f	666	/* change of server */
donatien	2:a4f97773c90f	667	pEntry->numdns++;
donatien	2:a4f97773c90f	668	pEntry->tmr = 1;
donatien	2:a4f97773c90f	669	pEntry->retries = 0;
donatien	2:a4f97773c90f	670	break;
donatien	2:a4f97773c90f	671	} else {
donatien	2:a4f97773c90f	672	LWIP_DEBUGF(DNS_DEBUG, ("dns_check_entry: \"%s\": timeout\n", pEntry->name));
donatien	2:a4f97773c90f	673	/* call specified callback function if provided */
donatien	2:a4f97773c90f	674	if (pEntry->found)
donatien	2:a4f97773c90f	675	(*pEntry->found)(pEntry->name, NULL, pEntry->arg);
donatien	2:a4f97773c90f	676	/* flush this entry */
donatien	2:a4f97773c90f	677	pEntry->state = DNS_STATE_UNUSED;
donatien	2:a4f97773c90f	678	pEntry->found = NULL;
donatien	2:a4f97773c90f	679	break;
donatien	2:a4f97773c90f	680	}
donatien	2:a4f97773c90f	681	}
donatien	2:a4f97773c90f	682
donatien	2:a4f97773c90f	683	/* wait longer for the next retry */
donatien	2:a4f97773c90f	684	pEntry->tmr = pEntry->retries;
donatien	2:a4f97773c90f	685
donatien	2:a4f97773c90f	686	/* send DNS packet for this entry */
donatien	2:a4f97773c90f	687	err = dns_send(pEntry->numdns, pEntry->name, i);
donatien	2:a4f97773c90f	688	if (err != ERR_OK) {
donatien	2:a4f97773c90f	689	LWIP_DEBUGF(DNS_DEBUG \| LWIP_DBG_LEVEL_WARNING,
donatien	2:a4f97773c90f	690	("dns_send returned error: %d\n", err));
donatien	2:a4f97773c90f	691	}
donatien	2:a4f97773c90f	692	}
donatien	2:a4f97773c90f	693	break;
donatien	2:a4f97773c90f	694	}
donatien	2:a4f97773c90f	695
donatien	2:a4f97773c90f	696	case DNS_STATE_DONE: {
donatien	2:a4f97773c90f	697	/* if the time to live is nul */
donatien	2:a4f97773c90f	698	if (--pEntry->ttl == 0) {
donatien	2:a4f97773c90f	699	LWIP_DEBUGF(DNS_DEBUG, ("dns_check_entry: \"%s\": flush\n", pEntry->name));
donatien	2:a4f97773c90f	700	/* flush this entry */
donatien	2:a4f97773c90f	701	pEntry->state = DNS_STATE_UNUSED;
donatien	2:a4f97773c90f	702	pEntry->found = NULL;
donatien	2:a4f97773c90f	703	}
donatien	2:a4f97773c90f	704	break;
donatien	2:a4f97773c90f	705	}
donatien	2:a4f97773c90f	706	case DNS_STATE_UNUSED:
donatien	2:a4f97773c90f	707	/* nothing to do */
donatien	2:a4f97773c90f	708	break;
donatien	2:a4f97773c90f	709	default:
donatien	2:a4f97773c90f	710	LWIP_ASSERT("unknown dns_table entry state:", 0);
donatien	2:a4f97773c90f	711	break;
donatien	2:a4f97773c90f	712	}
donatien	2:a4f97773c90f	713	}
donatien	2:a4f97773c90f	714
donatien	2:a4f97773c90f	715	/**
donatien	2:a4f97773c90f	716	* Call dns_check_entry for each entry in dns_table - check all entries.
donatien	2:a4f97773c90f	717	*/
donatien	2:a4f97773c90f	718	static void
donatien	2:a4f97773c90f	719	dns_check_entries(void)
donatien	2:a4f97773c90f	720	{
donatien	2:a4f97773c90f	721	u8_t i;
donatien	2:a4f97773c90f	722
donatien	2:a4f97773c90f	723	for (i = 0; i < DNS_TABLE_SIZE; ++i) {
donatien	2:a4f97773c90f	724	dns_check_entry(i);
donatien	2:a4f97773c90f	725	}
donatien	2:a4f97773c90f	726	}
donatien	2:a4f97773c90f	727
donatien	2:a4f97773c90f	728	/**
donatien	2:a4f97773c90f	729	* Receive input function for DNS response packets arriving for the dns UDP pcb.
donatien	2:a4f97773c90f	730	*
donatien	2:a4f97773c90f	731	* @params see udp.h
donatien	2:a4f97773c90f	732	*/
donatien	2:a4f97773c90f	733	static void
donatien	2:a4f97773c90f	734	dns_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port)
donatien	2:a4f97773c90f	735	{
donatien	2:a4f97773c90f	736	u16_t i;
donatien	2:a4f97773c90f	737	char *pHostname;
donatien	2:a4f97773c90f	738	struct dns_hdr *hdr;
donatien	2:a4f97773c90f	739	struct dns_answer ans;
donatien	2:a4f97773c90f	740	struct dns_table_entry *pEntry;
donatien	2:a4f97773c90f	741	u16_t nquestions, nanswers;
donatien	2:a4f97773c90f	742
donatien	2:a4f97773c90f	743	LWIP_UNUSED_ARG(arg);
donatien	2:a4f97773c90f	744	LWIP_UNUSED_ARG(pcb);
donatien	2:a4f97773c90f	745	LWIP_UNUSED_ARG(addr);
donatien	2:a4f97773c90f	746	LWIP_UNUSED_ARG(port);
donatien	2:a4f97773c90f	747
donatien	2:a4f97773c90f	748	/* is the dns message too big ? */
donatien	2:a4f97773c90f	749	if (p->tot_len > DNS_MSG_SIZE) {
donatien	2:a4f97773c90f	750	LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: pbuf too big\n"));
donatien	2:a4f97773c90f	751	/* free pbuf and return */
donatien	2:a4f97773c90f	752	goto memerr;
donatien	2:a4f97773c90f	753	}
donatien	2:a4f97773c90f	754
donatien	2:a4f97773c90f	755	/* is the dns message big enough ? */
donatien	2:a4f97773c90f	756	if (p->tot_len < (SIZEOF_DNS_HDR + SIZEOF_DNS_QUERY + SIZEOF_DNS_ANSWER)) {
donatien	2:a4f97773c90f	757	LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: pbuf too small\n"));
donatien	2:a4f97773c90f	758	/* free pbuf and return */
donatien	2:a4f97773c90f	759	goto memerr;
donatien	2:a4f97773c90f	760	}
donatien	2:a4f97773c90f	761
donatien	2:a4f97773c90f	762	/* copy dns payload inside static buffer for processing */
donatien	2:a4f97773c90f	763	if (pbuf_copy_partial(p, dns_payload, p->tot_len, 0) == p->tot_len) {
donatien	2:a4f97773c90f	764	/* The ID in the DNS header should be our entry into the name table. */
donatien	2:a4f97773c90f	765	hdr = (struct dns_hdr*)dns_payload;
donatien	2:a4f97773c90f	766	i = htons(hdr->id);
donatien	2:a4f97773c90f	767	if (i < DNS_TABLE_SIZE) {
donatien	2:a4f97773c90f	768	pEntry = &dns_table[i];
donatien	2:a4f97773c90f	769	if(pEntry->state == DNS_STATE_ASKING) {
donatien	2:a4f97773c90f	770	/* This entry is now completed. */
donatien	2:a4f97773c90f	771	pEntry->state = DNS_STATE_DONE;
donatien	2:a4f97773c90f	772	pEntry->err = hdr->flags2 & DNS_FLAG2_ERR_MASK;
donatien	2:a4f97773c90f	773
donatien	2:a4f97773c90f	774	/* We only care about the question(s) and the answers. The authrr
donatien	2:a4f97773c90f	775	and the extrarr are simply discarded. */
donatien	2:a4f97773c90f	776	nquestions = htons(hdr->numquestions);
donatien	2:a4f97773c90f	777	nanswers = htons(hdr->numanswers);
donatien	2:a4f97773c90f	778
donatien	2:a4f97773c90f	779	/* Check for error. If so, call callback to inform. */
donatien	2:a4f97773c90f	780	if (((hdr->flags1 & DNS_FLAG1_RESPONSE) == 0) \|\| (pEntry->err != 0) \|\| (nquestions != 1)) {
donatien	2:a4f97773c90f	781	LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": error in flags\n", pEntry->name));
donatien	2:a4f97773c90f	782	/* call callback to indicate error, clean up memory and return */
donatien	2:a4f97773c90f	783	goto responseerr;
donatien	2:a4f97773c90f	784	}
donatien	2:a4f97773c90f	785
donatien	2:a4f97773c90f	786	#if DNS_DOES_NAME_CHECK
donatien	2:a4f97773c90f	787	/* Check if the name in the "question" part match with the name in the entry. */
donatien	2:a4f97773c90f	788	if (dns_compare_name((unsigned char )(pEntry->name), (unsigned char )dns_payload + SIZEOF_DNS_HDR) != 0) {
donatien	2:a4f97773c90f	789	LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response not match to query\n", pEntry->name));
donatien	2:a4f97773c90f	790	/* call callback to indicate error, clean up memory and return */
donatien	2:a4f97773c90f	791	goto responseerr;
donatien	2:a4f97773c90f	792	}
donatien	2:a4f97773c90f	793	#endif /* DNS_DOES_NAME_CHECK */
donatien	2:a4f97773c90f	794
donatien	2:a4f97773c90f	795	/* Skip the name in the "question" part */
donatien	2:a4f97773c90f	796	pHostname = (char ) dns_parse_name((unsigned char )dns_payload + SIZEOF_DNS_HDR) + SIZEOF_DNS_QUERY;
donatien	2:a4f97773c90f	797
donatien	2:a4f97773c90f	798	while (nanswers > 0) {
donatien	2:a4f97773c90f	799	/* skip answer resource record's host name */
donatien	2:a4f97773c90f	800	pHostname = (char ) dns_parse_name((unsigned char )pHostname);
donatien	2:a4f97773c90f	801
donatien	2:a4f97773c90f	802	/* Check for IP address type and Internet class. Others are discarded. */
donatien	2:a4f97773c90f	803	SMEMCPY(&ans, pHostname, SIZEOF_DNS_ANSWER);
donatien	2:a4f97773c90f	804	if((ans.type == PP_HTONS(DNS_RRTYPE_A)) && (ans.cls == PP_HTONS(DNS_RRCLASS_IN)) &&
donatien	2:a4f97773c90f	805	(ans.len == PP_HTONS(sizeof(ip_addr_t))) ) {
donatien	2:a4f97773c90f	806	/* read the answer resource record's TTL, and maximize it if needed */
donatien	2:a4f97773c90f	807	pEntry->ttl = ntohl(ans.ttl);
donatien	2:a4f97773c90f	808	if (pEntry->ttl > DNS_MAX_TTL) {
donatien	2:a4f97773c90f	809	pEntry->ttl = DNS_MAX_TTL;
donatien	2:a4f97773c90f	810	}
donatien	2:a4f97773c90f	811	/* read the IP address after answer resource record's header */
donatien	2:a4f97773c90f	812	SMEMCPY(&(pEntry->ipaddr), (pHostname+SIZEOF_DNS_ANSWER), sizeof(ip_addr_t));
donatien	2:a4f97773c90f	813	LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response = ", pEntry->name));
donatien	2:a4f97773c90f	814	ip_addr_debug_print(DNS_DEBUG, (&(pEntry->ipaddr)));
donatien	2:a4f97773c90f	815	LWIP_DEBUGF(DNS_DEBUG, ("\n"));
donatien	2:a4f97773c90f	816	/* call specified callback function if provided */
donatien	2:a4f97773c90f	817	if (pEntry->found) {
donatien	2:a4f97773c90f	818	(*pEntry->found)(pEntry->name, &pEntry->ipaddr, pEntry->arg);
donatien	2:a4f97773c90f	819	}
donatien	2:a4f97773c90f	820	/* deallocate memory and return */
donatien	2:a4f97773c90f	821	goto memerr;
donatien	2:a4f97773c90f	822	} else {
donatien	2:a4f97773c90f	823	pHostname = pHostname + SIZEOF_DNS_ANSWER + htons(ans.len);
donatien	2:a4f97773c90f	824	}
donatien	2:a4f97773c90f	825	--nanswers;
donatien	2:a4f97773c90f	826	}
donatien	2:a4f97773c90f	827	LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": error in response\n", pEntry->name));
donatien	2:a4f97773c90f	828	/* call callback to indicate error, clean up memory and return */
donatien	2:a4f97773c90f	829	goto responseerr;
donatien	2:a4f97773c90f	830	}
donatien	2:a4f97773c90f	831	}
donatien	2:a4f97773c90f	832	}
donatien	2:a4f97773c90f	833
donatien	2:a4f97773c90f	834	/* deallocate memory and return */
donatien	2:a4f97773c90f	835	goto memerr;
donatien	2:a4f97773c90f	836
donatien	2:a4f97773c90f	837	responseerr:
donatien	2:a4f97773c90f	838	/* ERROR: call specified callback function with NULL as name to indicate an error */
donatien	2:a4f97773c90f	839	if (pEntry->found) {
donatien	2:a4f97773c90f	840	(*pEntry->found)(pEntry->name, NULL, pEntry->arg);
donatien	2:a4f97773c90f	841	}
donatien	2:a4f97773c90f	842	/* flush this entry */
donatien	2:a4f97773c90f	843	pEntry->state = DNS_STATE_UNUSED;
donatien	2:a4f97773c90f	844	pEntry->found = NULL;
donatien	2:a4f97773c90f	845
donatien	2:a4f97773c90f	846	memerr:
donatien	2:a4f97773c90f	847	/* free pbuf */
donatien	2:a4f97773c90f	848	pbuf_free(p);
donatien	2:a4f97773c90f	849	return;
donatien	2:a4f97773c90f	850	}
donatien	2:a4f97773c90f	851
donatien	2:a4f97773c90f	852	/**
donatien	2:a4f97773c90f	853	* Queues a new hostname to resolve and sends out a DNS query for that hostname
donatien	2:a4f97773c90f	854	*
donatien	2:a4f97773c90f	855	* @param name the hostname that is to be queried
donatien	2:a4f97773c90f	856	* @param found a callback founction to be called on success, failure or timeout
donatien	2:a4f97773c90f	857	* @param callback_arg argument to pass to the callback function
donatien	2:a4f97773c90f	858	* @return @return a err_t return code.
donatien	2:a4f97773c90f	859	*/
donatien	2:a4f97773c90f	860	static err_t
donatien	2:a4f97773c90f	861	dns_enqueue(const char name, dns_found_callback found, void callback_arg)
donatien	2:a4f97773c90f	862	{
donatien	2:a4f97773c90f	863	u8_t i;
donatien	2:a4f97773c90f	864	u8_t lseq, lseqi;
donatien	2:a4f97773c90f	865	struct dns_table_entry *pEntry = NULL;
donatien	2:a4f97773c90f	866	size_t namelen;
donatien	2:a4f97773c90f	867
donatien	2:a4f97773c90f	868	/* search an unused entry, or the oldest one */
donatien	2:a4f97773c90f	869	lseq = lseqi = 0;
donatien	2:a4f97773c90f	870	for (i = 0; i < DNS_TABLE_SIZE; ++i) {
donatien	2:a4f97773c90f	871	pEntry = &dns_table[i];
donatien	2:a4f97773c90f	872	/* is it an unused entry ? */
donatien	2:a4f97773c90f	873	if (pEntry->state == DNS_STATE_UNUSED)
donatien	2:a4f97773c90f	874	break;
donatien	2:a4f97773c90f	875
donatien	2:a4f97773c90f	876	/* check if this is the oldest completed entry */
donatien	2:a4f97773c90f	877	if (pEntry->state == DNS_STATE_DONE) {
donatien	2:a4f97773c90f	878	if ((dns_seqno - pEntry->seqno) > lseq) {
donatien	2:a4f97773c90f	879	lseq = dns_seqno - pEntry->seqno;
donatien	2:a4f97773c90f	880	lseqi = i;
donatien	2:a4f97773c90f	881	}
donatien	2:a4f97773c90f	882	}
donatien	2:a4f97773c90f	883	}
donatien	2:a4f97773c90f	884
donatien	2:a4f97773c90f	885	/* if we don't have found an unused entry, use the oldest completed one */
donatien	2:a4f97773c90f	886	if (i == DNS_TABLE_SIZE) {
donatien	2:a4f97773c90f	887	if ((lseqi >= DNS_TABLE_SIZE) \|\| (dns_table[lseqi].state != DNS_STATE_DONE)) {
donatien	2:a4f97773c90f	888	/* no entry can't be used now, table is full */
donatien	2:a4f97773c90f	889	LWIP_DEBUGF(DNS_DEBUG, ("dns_enqueue: \"%s\": DNS entries table is full\n", name));
donatien	2:a4f97773c90f	890	return ERR_MEM;
donatien	2:a4f97773c90f	891	} else {
donatien	2:a4f97773c90f	892	/* use the oldest completed one */
donatien	2:a4f97773c90f	893	i = lseqi;
donatien	2:a4f97773c90f	894	pEntry = &dns_table[i];
donatien	2:a4f97773c90f	895	}
donatien	2:a4f97773c90f	896	}
donatien	2:a4f97773c90f	897
donatien	2:a4f97773c90f	898	/* use this entry */
donatien	2:a4f97773c90f	899	LWIP_DEBUGF(DNS_DEBUG, ("dns_enqueue: \"%s\": use DNS entry %"U16_F"\n", name, (u16_t)(i)));
donatien	2:a4f97773c90f	900
donatien	2:a4f97773c90f	901	/* fill the entry */
donatien	2:a4f97773c90f	902	pEntry->state = DNS_STATE_NEW;
donatien	2:a4f97773c90f	903	pEntry->seqno = dns_seqno++;
donatien	2:a4f97773c90f	904	pEntry->found = found;
donatien	2:a4f97773c90f	905	pEntry->arg = callback_arg;
donatien	2:a4f97773c90f	906	namelen = LWIP_MIN(strlen(name), DNS_MAX_NAME_LENGTH-1);
donatien	2:a4f97773c90f	907	MEMCPY(pEntry->name, name, namelen);
donatien	2:a4f97773c90f	908	pEntry->name[namelen] = 0;
donatien	2:a4f97773c90f	909
donatien	2:a4f97773c90f	910	/* force to send query without waiting timer */
donatien	2:a4f97773c90f	911	dns_check_entry(i);
donatien	2:a4f97773c90f	912
donatien	2:a4f97773c90f	913	/* dns query is enqueued */
donatien	2:a4f97773c90f	914	return ERR_INPROGRESS;
donatien	2:a4f97773c90f	915	}
donatien	2:a4f97773c90f	916
donatien	2:a4f97773c90f	917	/**
donatien	2:a4f97773c90f	918	* Resolve a hostname (string) into an IP address.
donatien	2:a4f97773c90f	919	* NON-BLOCKING callback version for use with raw API!!!
donatien	2:a4f97773c90f	920	*
donatien	2:a4f97773c90f	921	* Returns immediately with one of err_t return codes:
donatien	2:a4f97773c90f	922	* - ERR_OK if hostname is a valid IP address string or the host
donatien	2:a4f97773c90f	923	* name is already in the local names table.
donatien	2:a4f97773c90f	924	* - ERR_INPROGRESS enqueue a request to be sent to the DNS server
donatien	2:a4f97773c90f	925	* for resolution if no errors are present.
donatien	2:a4f97773c90f	926	*
donatien	2:a4f97773c90f	927	* @param hostname the hostname that is to be queried
donatien	2:a4f97773c90f	928	* @param addr pointer to a ip_addr_t where to store the address if it is already
donatien	2:a4f97773c90f	929	* cached in the dns_table (only valid if ERR_OK is returned!)
donatien	2:a4f97773c90f	930	* @param found a callback function to be called on success, failure or timeout (only if
donatien	2:a4f97773c90f	931	* ERR_INPROGRESS is returned!)
donatien	2:a4f97773c90f	932	* @param callback_arg argument to pass to the callback function
donatien	2:a4f97773c90f	933	* @return a err_t return code.
donatien	2:a4f97773c90f	934	*/
donatien	2:a4f97773c90f	935	err_t
donatien	2:a4f97773c90f	936	dns_gethostbyname(const char hostname, ip_addr_t addr, dns_found_callback found,
donatien	2:a4f97773c90f	937	void *callback_arg)
donatien	2:a4f97773c90f	938	{
donatien	2:a4f97773c90f	939	u32_t ipaddr;
donatien	2:a4f97773c90f	940	/* not initialized or no valid server yet, or invalid addr pointer
donatien	2:a4f97773c90f	941	* or invalid hostname or invalid hostname length */
donatien	2:a4f97773c90f	942	if ((dns_pcb == NULL) \|\| (addr == NULL) \|\|
donatien	2:a4f97773c90f	943	(!hostname) \|\| (!hostname[0]) \|\|
donatien	2:a4f97773c90f	944	(strlen(hostname) >= DNS_MAX_NAME_LENGTH)) {
donatien	2:a4f97773c90f	945	return ERR_VAL;
donatien	2:a4f97773c90f	946	}
donatien	2:a4f97773c90f	947
donatien	2:a4f97773c90f	948	#if LWIP_HAVE_LOOPIF
donatien	2:a4f97773c90f	949	if (strcmp(hostname, "localhost")==0) {
donatien	2:a4f97773c90f	950	ip_addr_set_loopback(addr);
donatien	2:a4f97773c90f	951	return ERR_OK;
donatien	2:a4f97773c90f	952	}
donatien	2:a4f97773c90f	953	#endif /* LWIP_HAVE_LOOPIF */
donatien	2:a4f97773c90f	954
donatien	2:a4f97773c90f	955	/* host name already in octet notation? set ip addr and return ERR_OK */
donatien	2:a4f97773c90f	956	ipaddr = ipaddr_addr(hostname);
donatien	2:a4f97773c90f	957	if (ipaddr == IPADDR_NONE) {
donatien	2:a4f97773c90f	958	/* already have this address cached? */
donatien	2:a4f97773c90f	959	ipaddr = dns_lookup(hostname);
donatien	2:a4f97773c90f	960	}
donatien	2:a4f97773c90f	961	if (ipaddr != IPADDR_NONE) {
donatien	2:a4f97773c90f	962	ip4_addr_set_u32(addr, ipaddr);
donatien	2:a4f97773c90f	963	return ERR_OK;
donatien	2:a4f97773c90f	964	}
donatien	2:a4f97773c90f	965
donatien	2:a4f97773c90f	966	/* queue query with specified callback */
donatien	2:a4f97773c90f	967	return dns_enqueue(hostname, found, callback_arg);
donatien	2:a4f97773c90f	968	}
donatien	2:a4f97773c90f	969
donatien	2:a4f97773c90f	970	#endif /* LWIP_DNS */

Repository toolbox

Export to desktop IDE

Repository details

Type:	Library
Created:	31 Dec 2013
Imports:	1
Forks:	0
Commits:	13
Dependents:	1
Dependencies:	0
Followers:	1

This repository is Public (Unlisted).

lwip/core/dns.c@2:a4f97773c90f, 2010-06-18 (annotated)

Who changed what in which revision?

Repository toolbox

Repository details

Important Information for this Arm website

Access Warning