uIP hostname resolver functions

The uIP DNS resolver functions are used to lookup a hostname and map it to a numerical IP address.

It maintains a list of resolved hostnames that can be queried with the resolv_lookup() function. New hostnames can be resolved using the resolv_query() function.

The event resolv_event_found is posted when a hostname has been resolved. It is up to the receiving process to determine if the correct hostname has been found by calling the resolv_lookup() function with the hostname.

Data Structures
struct	dns_answer
struct	dns_hdr
struct	dns_question
struct	namemap

Files
file	mdns.c
	DNS host name to IP address resolver.
file	resolv.c
	DNS host name to IP address resolver.

Macros
#define	_DEBUG_   CONTIKI_TARGET_COOJA
#define	CONTIKI_CONF_DEFAULT_HOSTNAME   "contiki-"CONTIKI_TARGET_NAME
#define	CONTIKI_CONF_DEFAULT_HOSTNAME   "contiki"
#define	CONTIKI_TARGET_NAME   stringy(BOARD)
#define	DEBUG_PRINTF(...)   do { } while(0)
#define	DNS_CLASS_ANY   (255)
#define	DNS_CLASS_ANY   255
#define	DNS_CLASS_IN   (1)
#define	DNS_CLASS_IN   1
#define	DNS_PORT   (53)
#define	DNS_PORT   53
#define	DNS_TYPE_A   (1)
#define	DNS_TYPE_A   1
#define	DNS_TYPE_AAAA   (1) /* XXX temporarily fake A records */
#define	DNS_TYPE_AAAA   28
#define	DNS_TYPE_ANY   (255)
#define	DNS_TYPE_ANY   255
#define	DNS_TYPE_CNAME   (5)
#define	DNS_TYPE_CNAME   5
#define	DNS_TYPE_MX   (15)
#define	DNS_TYPE_MX   15
#define	DNS_TYPE_NSEC   47
#define	DNS_TYPE_PTR   (12)
#define	DNS_TYPE_PTR   12
#define	DNS_TYPE_SRV   (33)
#define	DNS_TYPE_SRV   33
#define	DNS_TYPE_TXT   (16)
#define	DNS_TYPE_TXT   16
#define	MDNS_CONF_MAX_DOMAIN_NAME_SIZE   (32)
#define	MDNS_CONF_MAX_MDNS_RETRIES   (3)
#define	MDNS_CONF_MAX_RETRIES   (8)
#define	MDNS_CONF_MDNS_INCLUDE_GLOBAL_V6_ADDRS   (0)
#define	MDNS_CONF_MDNS_RESPONDER   0
#define	MDNS_CONF_SUPPORTS_MDNS   0
#define	MDNS_DECODE_INDEX(i)   (unsigned char)(uip_ntohs(i) - 61616)
#define	MDNS_ENCODE_INDEX(i)   (uip_htons(i + 61616))
#define	MDNS_ENTRIES   4
#define	MDNS_PORT   (5353)
#define	MDNS_PORT   5353
#define	MDNS_RESPONDER_PORT   (5354)
#define	MDNS_RESPONDER_PORT   5354
#define	NATIVE_DNS_TYPE   DNS_TYPE_AAAA /* IPv6 */
#define	PRINTF(...)   do { } while(0)
#define	RESOLV_AUTO_REMOVE_TRAILING_DOTS   RESOLV_CONF_SUPPORTS_MDNS
#define	RESOLV_CONF_MAX_DOMAIN_NAME_SIZE   32
#define	RESOLV_CONF_MAX_MDNS_RETRIES   3
#define	RESOLV_CONF_MAX_RETRIES   4
	The maximum number of retries when asking for a name. More...
#define	RESOLV_CONF_MDNS_INCLUDE_GLOBAL_V6_ADDRS   0
#define	RESOLV_DECODE_INDEX(i)   (unsigned char)(uip_ntohs(i-1))
#define	RESOLV_ENCODE_INDEX(i)   (uip_htons(i+1))
#define	RESOLV_ENTRIES   4
#define	RESOLV_SUPPORTS_RECORD_EXPIRATION   1
#define	RESOLV_VERIFY_ANSWER_NAMES   RESOLV_CONF_SUPPORTS_MDNS
#define	stringy(x)   stringy2(x)
#define	stringy2(x)   #x
#define	UIP_UDP_BUF   ((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])
#define	VERBOSE_DEBUG   0
#define	VERBOSE_DEBUG   0
#define	WITH_EDNS_LIMIT_UDP_RES_PAYLOAD   1

Enumerations
enum	{   MDNS_STATE_WAIT_BEFORE_PROBE,   MDNS_STATE_PROBING,   MDNS_STATE_READY }

Functions
static void	check_entries (void)
static uint8_t	decode_name (const unsigned char *query, char *dest, const unsigned char *packet)
	Decodes a DNS name from the DNS format into the given string. More...
static uint8_t	dns_name_isequal (const unsigned char *queryptr, const char *name, const unsigned char *packet)
static unsigned char *	encode_name (unsigned char *query, char *nameptr)
static unsigned char *	encode_name (unsigned char *query, const char *nameptr)
static void	mdns_announce_requested (void)
void	mdns_conf (const uip_ipaddr_t *dnsserver)
	Configure a DNS server. More...
static void	mdns_found (char *name, uip_ipaddr_t *ipaddr)
uip_ipaddr_t *	mdns_getserver (void)
	Obtain the currently configured DNS server. More...
void	mdns_init (void)
uip_ipaddr_t *	mdns_lookup (const char *name)
	Look up a hostname in the array of known hostnames. More...
static size_t	mdns_prep_host_announce_packet (void)
void	mdns_query (const char *name)
	Queues a name so that a question for the name will be sent out. More...
static unsigned char *	mdns_write_announce_records (unsigned char *queryptr, uint8_t *count)
static void	newdata (void)
static unsigned char *	parse_name (unsigned char *query)
	PROCESS (mdns_process,"DNS mdnser")
	PROCESS (resolv_process,"DNS resolver")
	PROCESS (mdns_probe_process,"mDNS probe")
	PROCESS_THREAD (mdns_process, ev, data)
	PROCESS_THREAD (mdns_probe_process, ev, data)
	PROCESS_THREAD (resolv_process, ev, data)
static const char *	remove_trailing_dots (const char *name)
void	resolv_conf (const uip_ipaddr_t *dnsserver)
	Configure a DNS server. More...
static void	resolv_found (char *name, uip_ipaddr_t *ipaddr)
const char *	resolv_get_hostname (void)
	Returns the local hostname being advertised via MDNS. More...
uip_ipaddr_t *	resolv_getserver (void)
	Obtain the currently configured DNS server. More...
resolv_status_t	resolv_lookup (const char *name, uip_ipaddr_t **ipaddr)
	Look up a hostname in the array of known hostnames. More...
void	resolv_query (const char *name)
	Queues a name so that a question for the name will be sent out. More...
void	resolv_set_hostname (const char *hostname)
	Changes the local hostname advertised by MDNS. More...
static unsigned char *	skip_name (unsigned char *query)
static void	start_name_collision_check (clock_time_t after)
int	strcasecmp (const char *s1, const char *s2)
int	strncasecmp (const char *s1, const char *s2, size_t n)

Variables
static char	dns_name_without_dots [MDNS_CONF_MAX_DOMAIN_NAME_SIZE+1]
static uip_ipaddr_t	dns_server
static uint8_t	dns_server_configured = 0
static struct uip_udp_conn *	mdns_conn = NULL
process_event_t	mdns_event_found
	Event that is broadcasted when a DNS name has been resolved. More...
static const uip_ipaddr_t	mdns_mdns_addr
static int	mdns_needs_host_announce
static uint8_t	mdns_state
static struct namemap	names [MDNS_ENTRIES]
static struct namemap	names [RESOLV_ENTRIES]
static struct uip_udp_conn *	resolv_conn = NULL
static uip_ipaddr_t	resolv_default_dns_server
	These default values for the DNS server are Google's public DNS: https://developers.google.com/speed/public-dns/docs/using More...
process_event_t	resolv_event_found
	Event that is broadcasted when a DNS name has been resolved. More...
static char	resolv_hostname [RESOLV_CONF_MAX_DOMAIN_NAME_SIZE+1]
static const uip_ipaddr_t	resolv_mdns_addr
static struct etimer	retry
static struct etimer	retry
static uint8_t	seqno
static uint8_t	seqno

#define _DEBUG_   CONTIKI_TARGET_COOJA

#define CONTIKI_CONF_DEFAULT_HOSTNAME   "contiki-"CONTIKI_TARGET_NAME

Referenced by PROCESS_THREAD().

#define CONTIKI_CONF_DEFAULT_HOSTNAME   "contiki"

#define CONTIKI_TARGET_NAME   stringy(BOARD)

#define DEBUG_PRINTF

(

...

)

do { } while(0)

Referenced by newdata(), resolv_lookup(), and skip_name().

#define DNS_CLASS_ANY   (255)

#define DNS_CLASS_ANY   255

#define DNS_CLASS_IN   (1)

Referenced by check_entries(), and newdata().

#define DNS_CLASS_IN   1

Referenced by check_entries(), mdns_prep_host_announce_packet(), mdns_write_announce_records(), and newdata().

#define DNS_PORT   (53)

Referenced by check_entries().

#define DNS_PORT   53

Referenced by check_entries().

#define DNS_TYPE_A   (1)

Referenced by check_entries(), and newdata().

#define DNS_TYPE_A   1

#define DNS_TYPE_AAAA   (1) /* XXX temporarily fake A records */

Referenced by check_entries(), and newdata().

#define DNS_TYPE_AAAA   28

#define DNS_TYPE_ANY   (255)

Referenced by newdata().

#define DNS_TYPE_ANY   255

Referenced by check_entries(), and newdata().

#define DNS_TYPE_CNAME   (5)

#define DNS_TYPE_CNAME   5

#define DNS_TYPE_MX   (15)

#define DNS_TYPE_MX   15

#define DNS_TYPE_NSEC   47

Referenced by mdns_prep_host_announce_packet().

#define DNS_TYPE_PTR   (12)

#define DNS_TYPE_PTR   12

#define DNS_TYPE_SRV   (33)

#define DNS_TYPE_SRV   33

#define DNS_TYPE_TXT   (16)

#define DNS_TYPE_TXT   16

#define MDNS_CONF_MAX_DOMAIN_NAME_SIZE   (32)

#define MDNS_CONF_MAX_MDNS_RETRIES   (3)

Referenced by check_entries().

#define MDNS_CONF_MAX_RETRIES   (8)

The maximum number of retries when asking for a name.

Referenced by check_entries().

#define MDNS_CONF_MDNS_INCLUDE_GLOBAL_V6_ADDRS   (0)

Referenced by newdata().

#define MDNS_CONF_MDNS_RESPONDER   0

#define MDNS_CONF_SUPPORTS_MDNS   0

Referenced by check_entries().

#define MDNS_DECODE_INDEX

(

i

)

(unsigned char)(uip_ntohs(i) - 61616)

Referenced by newdata().

#define MDNS_ENCODE_INDEX

(

i

)

(uip_htons(i + 61616))

Referenced by check_entries().

#define MDNS_ENTRIES   4

Referenced by check_entries(), mdns_lookup(), mdns_query(), and newdata().

#define MDNS_PORT   (5353)

Referenced by check_entries(), newdata(), and PROCESS_THREAD().

#define MDNS_PORT   5353

Referenced by check_entries(), newdata(), and PROCESS_THREAD().

#define MDNS_RESPONDER_PORT   (5354)

#define MDNS_RESPONDER_PORT   5354

#define NATIVE_DNS_TYPE   DNS_TYPE_AAAA /* IPv6 */

Referenced by check_entries(), mdns_write_announce_records(), and newdata().

#define PRINTF

(

...

)

do { } while(0)

Referenced by check_entries(), newdata(), PROCESS_THREAD(), resolv_found(), resolv_lookup(), resolv_query(), and resolv_set_hostname().

#define RESOLV_AUTO_REMOVE_TRAILING_DOTS   RESOLV_CONF_SUPPORTS_MDNS

#define RESOLV_CONF_MAX_DOMAIN_NAME_SIZE   32

Referenced by decode_name(), remove_trailing_dots(), resolv_found(), and resolv_set_hostname().

#define RESOLV_CONF_MAX_MDNS_RETRIES   3

Referenced by check_entries().

#define RESOLV_CONF_MAX_RETRIES   4

The maximum number of retries when asking for a name.

Referenced by check_entries().

#define RESOLV_CONF_MDNS_INCLUDE_GLOBAL_V6_ADDRS   0

Referenced by mdns_write_announce_records().

#define RESOLV_DECODE_INDEX

(

i

)

(unsigned char)(uip_ntohs(i-1))

Referenced by newdata().

#define RESOLV_ENCODE_INDEX

(

i

)

(uip_htons(i+1))

Referenced by check_entries().

#define RESOLV_ENTRIES   4

Referenced by check_entries(), newdata(), resolv_lookup(), and resolv_query().

#define RESOLV_SUPPORTS_RECORD_EXPIRATION   1

Referenced by newdata(), and resolv_query().

#define RESOLV_VERIFY_ANSWER_NAMES   RESOLV_CONF_SUPPORTS_MDNS

#define stringy

(

x

)

stringy2(x)

#define stringy2

(

x

)

#x

#define UIP_UDP_BUF   ((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])

Referenced by newdata().

#define VERBOSE_DEBUG   0

#define VERBOSE_DEBUG   0

#define WITH_EDNS_LIMIT_UDP_RES_PAYLOAD   1

anonymous enum

Enumerator
MDNS_STATE_WAIT_BEFORE_PROBE
MDNS_STATE_PROBING
MDNS_STATE_READY

static void check_entries ( void  )

static

Runs through the list of names to see if there are any that have not yet been queried and, if so, sends out a query.

References CLOCK_SECOND, clock_seconds(), DNS_CLASS_IN, DNS_FLAG1_RD, DNS_PORT, DNS_TYPE_ANY, encode_name(), etimer_set(), namemap::expiration, dns_hdr::flags1, i, dns_hdr::id, namemap::is_mdns, namemap::is_probe, MDNS_PORT, mdns_write_announce_records(), namemap::name, names, NATIVE_DNS_TYPE, NULL, dns_hdr::numauthrr, dns_hdr::numquestions, PRINTF, RESOLV_CONF_MAX_MDNS_RETRIES, RESOLV_CONF_MAX_RETRIES, RESOLV_ENCODE_INDEX, RESOLV_ENTRIES, resolv_found(), namemap::retries, retry, namemap::state, STATE_ASKING, STATE_ERROR, STATE_NEW, namemap::tmr, uip_appdata, and uip_udp_packet_sendto().

Referenced by PROCESS_THREAD().

static uint8_t decode_name ( const unsigned char *  query, char *  dest, const unsigned char *  packet  )

static

Decodes a DNS name from the DNS format into the given string.

Returns

1 upon success, 0 if the size of the name would be too large.

Note

dest must point to a buffer with at least RESOLV_CONF_MAX_DOMAIN_NAME_SIZE+1 bytes large.

References len, n, and RESOLV_CONF_MAX_DOMAIN_NAME_SIZE.

Referenced by newdata().

static uint8_t dns_name_isequal ( const unsigned char *  queryptr, const char *  name, const unsigned char *  packet  )

static

References n.

Referenced by newdata().

static unsigned char* encode_name ( unsigned char *  query, char *  nameptr  )

static

References n.

Referenced by check_entries(), and newdata().

static unsigned char* encode_name ( unsigned char *  query, const char *  nameptr  )

static

References n.

Referenced by check_entries(), mdns_prep_host_announce_packet(), and mdns_write_announce_records().

static void mdns_announce_requested ( void  )

static

References mdns_needs_host_announce.

Referenced by newdata(), and PROCESS_THREAD().

void mdns_conf

(

const uip_ipaddr_t *

dnsserver

)

Configure a DNS server.

Parameters

dnsserver

A pointer to a 4-byte representation of the IP address of the DNS server to be configured.

References NULL.

Referenced by PROCESS_THREAD().

static void mdns_found ( char *  name, uip_ipaddr_t *  ipaddr  )

static

Callback function which is called when a hostname is found.

References printf, PROCESS_BROADCAST, and process_post().

Referenced by check_entries(), and newdata().

uip_ipaddr_t* mdns_getserver

(

void

)

Obtain the currently configured DNS server.

Returns

A pointer to a 4-byte representation of the IP address of the currently configured DNS server or NULL if no DNS server has been configured.

References dns_server, and NULL.

void mdns_init

(

void

)

References NULL, and process_start().

Referenced by PROCESS_THREAD().

uip_ipaddr_t* mdns_lookup

(

const char *

name

)

Look up a hostname in the array of known hostnames.

Note

This function only looks in the internal array of known hostnames, it does not send out a query for the hostname if none was found. The function mdns_query() can be used to send a query for a hostname.

Returns

A pointer to a 4-byte representation of the hostname's IP address, or NULL if the hostname was not found in the array of hostnames.

References addr, dns_name_without_dots, i, namemap::ipaddr, len, MDNS_ENTRIES, namemap::name, names, NULL, printf, namemap::state, STATE_DONE, and uip_ip6addr_t::u8.

static size_t mdns_prep_host_announce_packet ( void  )

static

Called when we need to announce ourselves

References DNS_CLASS_IN, DNS_FLAG1_AUTHORATIVE, DNS_FLAG1_RESPONSE, DNS_TYPE_NSEC, encode_name(), dns_hdr::flags1, dns_answer::len, mdns_write_announce_records(), dns_hdr::numanswers, dns_hdr::numextrarr, resolv_hostname, dns_answer::ttl, dns_answer::type, and uip_appdata.

Referenced by newdata(), and PROCESS_THREAD().

void mdns_query

(

const char *

name

)

Queues a name so that a question for the name will be sent out.

Parameters

name	The hostname that is to be queried.

References dns_name_without_dots, i, namemap::is_mdns, len, MDNS_ENTRIES, namemap::name, names, printf, PROCESS_EVENT_TIMER, process_post(), seqno, namemap::seqno, namemap::state, STATE_NEW, and STATE_UNUSED.

Referenced by PROCESS_THREAD().

static unsigned char* mdns_write_announce_records ( unsigned char *  queryptr, uint8_t *  count  )

static

References uip_ds6_netif::addr_list, dns_answer::class, DNS_CLASS_IN, encode_name(), i, uip_ds6_addr::ipaddr, dns_answer::ipaddr, uip_ds6_addr::isused, dns_answer::len, NATIVE_DNS_TYPE, RESOLV_CONF_MDNS_INCLUDE_GLOBAL_V6_ADDRS, resolv_hostname, dns_answer::ttl, dns_answer::type, UIP_DS6_ADDR_NB, uip_ds6_if, uip_gethostaddr, and uip_is_addr_link_local.

Referenced by check_entries(), and mdns_prep_host_announce_packet().

static void newdata ( void  )

static

Called when new UDP data arrives.

QUESTION HANDLING SECTION

ANSWER HANDLING SECTION

References dns_answer::class, dns_question::class, CLOCK_SECOND, clock_seconds(), DEBUG_PRINTF, decode_name(), DNS_CLASS_IN, DNS_FLAG2_ERR_MASK, dns_name_isequal(), DNS_TYPE_ANY, namemap::err, namemap::expiration, dns_hdr::flags1, dns_hdr::flags2, i, dns_hdr::id, dns_answer::ipaddr, namemap::ipaddr, dns_answer::len, mdns_announce_requested(), MDNS_PORT, mdns_prep_host_announce_packet(), mdns_state, MDNS_STATE_READY, namemap::name, names, NATIVE_DNS_TYPE, NULL, dns_hdr::numanswers, dns_hdr::numauthrr, dns_hdr::numextrarr, dns_hdr::numquestions, PRINTF, RESOLV_DECODE_INDEX, RESOLV_ENTRIES, resolv_found(), resolv_hostname, RESOLV_SUPPORTS_RECORD_EXPIRATION, skip_name(), start_name_collision_check(), namemap::state, state, STATE_ASKING, STATE_DONE, STATE_ERROR, STATE_UNUSED, dns_answer::ttl, dns_answer::type, dns_question::type, uip_appdata, uip_htons(), UIP_UDP_BUF, and uip_udp_packet_sendto().

Referenced by PROCESS_THREAD().

static unsigned char* parse_name ( unsigned char *  query )

static

Walk through a compact encoded DNS name and return the end of it.

Returns

The end of the name.

References n, and printf.

Referenced by newdata().

PROCESS	(	mdns_process	,
		"DNS mdnser"
	)

PROCESS	(	resolv_process	,
		"DNS resolver"
	)

PROCESS	(	mdns_probe_process	,
		"mDNS probe"
	)

PROCESS_THREAD	(	mdns_process	,
		ev	,
		data
	)

References check_entries(), MDNS_PORT, mdns_query(), names, newdata(), NULL, printf, process_alloc_event(), PROCESS_BEGIN, PROCESS_END, PROCESS_EVENT_TIMER, PROCESS_WAIT_EVENT, uip_udp_conn::rport, start_name_collision_check(), tcpip_event, tcpip_poll_udp(), udp_new(), uip_ds6_maddr_add(), uip_newdata, uip_poll, and uip_udp_bind.

PROCESS_THREAD	(	mdns_probe_process	,
		ev	,
		data
	)

Process for probing for name conflicts.

References CLOCK_SECOND, etimer_set(), mdns_announce_requested(), mdns_state, MDNS_STATE_PROBING, MDNS_STATE_READY, MDNS_STATE_WAIT_BEFORE_PROBE, NULL, PRINTF, PROCESS_BEGIN, PROCESS_END, PROCESS_EVENT_TIMER, PROCESS_WAIT_EVENT_UNTIL, random_rand(), resolv_event_found, resolv_hostname, resolv_query(), and strcasecmp().

PROCESS_THREAD	(	resolv_process	,
		ev	,
		data
	)

The main UDP function.

References check_entries(), CONTIKI_CONF_DEFAULT_HOSTNAME, len, mdns_needs_host_announce, MDNS_PORT, mdns_prep_host_announce_packet(), names, newdata(), NULL, PRINTF, process_alloc_event(), PROCESS_BEGIN, PROCESS_END, PROCESS_EVENT_TIMER, PROCESS_WAIT_EVENT, resolv_event_found, resolv_hostname, resolv_set_hostname(), tcpip_event, tcpip_poll_udp(), udp_new(), uip_appdata, uip_ds6_maddr_add(), uip_newdata, uip_poll, uip_udp_bind, and uip_udp_packet_sendto().

static const char* remove_trailing_dots ( const char *  name )

static

References dns_name_without_dots, len, and RESOLV_CONF_MAX_DOMAIN_NAME_SIZE.

Referenced by resolv_lookup(), and resolv_query().

void resolv_conf

(

const uip_ipaddr_t *

dnsserver

)

Configure a DNS server.

Parameters

dnsserver

A pointer to a 4-byte representation of the IP address of the DNS server to be configured.

static void resolv_found ( char *  name, uip_ipaddr_t *  ipaddr  )

static

Callback function which is called when a hostname is found.

References uip_802154_longaddr::addr, CLOCK_SECOND, i, mdns_state, MDNS_STATE_PROBING, MDNS_STATE_READY, PRINTF, PROCESS_BROADCAST, process_post(), RESOLV_CONF_MAX_DOMAIN_NAME_SIZE, resolv_event_found, resolv_hostname, start_name_collision_check(), strncasecmp(), UIP_CONF_IPV6, uip_ds6_is_my_addr, uip_hostaddr, uip_ipaddr_cmp, uip_lladdr, and UIP_LLADDR_LEN.

Referenced by check_entries(), and newdata().

const char* resolv_get_hostname

(

void

)

Returns the local hostname being advertised via MDNS.

Returns

C-string containing the local hostname.

References resolv_hostname.

uip_ipaddr_t* resolv_getserver

(

void

)

Obtain the currently configured DNS server.

Returns

A pointer to a 4-byte representation of the IP address of the currently configured DNS server or NULL if no DNS server has been configured.

References resolv_default_dns_server.

resolv_status_t resolv_lookup	(	const char *	name,
		uip_ipaddr_t **	ipaddr
	)

Look up a hostname in the array of known hostnames.

Note

This function only looks in the internal array of known hostnames, it does not send out a query for the hostname if none was found. The function resolv_query() can be used to send a query for a hostname.

References addr, clock_seconds(), DEBUG_PRINTF, namemap::expiration, i, ipaddr, namemap::ipaddr, namemap::name, names, PRINTF, remove_trailing_dots(), RESOLV_ENTRIES, RESOLV_STATUS_CACHED, RESOLV_STATUS_EXPIRED, RESOLV_STATUS_NOT_FOUND, RESOLV_STATUS_RESOLVING, RESOLV_STATUS_UNCACHED, namemap::state, STATE_ASKING, STATE_DONE, STATE_ERROR, STATE_NEW, and strcasecmp().

void resolv_query

(

const char *

name

)

Queues a name so that a question for the name will be sent out.

Parameters

name	The hostname that is to be queried.

References clock_seconds(), namemap::expiration, i, namemap::is_mdns, namemap::is_probe, mdns_state, MDNS_STATE_PROBING, namemap::name, names, PRINTF, PROCESS_EVENT_TIMER, process_post(), remove_trailing_dots(), RESOLV_ENTRIES, resolv_hostname, RESOLV_SUPPORTS_RECORD_EXPIRATION, namemap::seqno, seqno, namemap::state, STATE_DONE, STATE_NEW, STATE_UNUSED, and strcasecmp().

Referenced by PROCESS_THREAD().

void resolv_set_hostname

(

const char *

hostname

)

Changes the local hostname advertised by MDNS.

Parameters

hostname

The new hostname to advertise.

References PRINTF, RESOLV_CONF_MAX_DOMAIN_NAME_SIZE, resolv_hostname, start_name_collision_check(), and strcasecmp().

Referenced by PROCESS_THREAD().

static unsigned char* skip_name ( unsigned char *  query )

static

References DEBUG_PRINTF, and n.

Referenced by newdata().

static void start_name_collision_check ( clock_time_t  after )

static

References process_exit(), and process_start().

Referenced by newdata(), PROCESS_THREAD(), resolv_found(), and resolv_set_hostname().

int strcasecmp	(	const char *	s1,
		const char *	s2
	)

Referenced by newdata(), PROCESS_THREAD(), resolv_lookup(), resolv_query(), and resolv_set_hostname().

int strncasecmp	(	const char *	s1,
		const char *	s2,
		size_t	n
	)

Referenced by newdata(), and resolv_found().

char dns_name_without_dots[MDNS_CONF_MAX_DOMAIN_NAME_SIZE+1]

static

Referenced by mdns_lookup(), mdns_query(), and remove_trailing_dots().

uip_ipaddr_t dns_server

static

Referenced by mdns_getserver().

uint8_t dns_server_configured = 0

static

struct uip_udp_conn* mdns_conn = NULL

static

process_event_t mdns_event_found

Event that is broadcasted when a DNS name has been resolved.

const uip_ipaddr_t mdns_mdns_addr

static

Initial value:

= {
  .u8 = {
         0xff, 0x02, 0x00, 0x00,
         0x00, 0x00, 0x00, 0x00,
         0x00, 0x00, 0x00, 0x00,
         0x00, 0x00, 0x00, 0xfb,
         }
}

int mdns_needs_host_announce

static

Referenced by mdns_announce_requested(), and PROCESS_THREAD().

uint8_t mdns_state

static

Referenced by newdata(), PROCESS_THREAD(), resolv_found(), and resolv_query().

struct namemap names[MDNS_ENTRIES]

static

Referenced by check_entries(), mdns_lookup(), mdns_query(), newdata(), and PROCESS_THREAD().

struct namemap names[RESOLV_ENTRIES]

static

Referenced by check_entries(), newdata(), PROCESS_THREAD(), resolv_lookup(), and resolv_query().

struct uip_udp_conn* resolv_conn = NULL

static

uip_ipaddr_t resolv_default_dns_server

static

Initial value:

=

  { { 0x20, 0x01, 0x48, 0x60, 0x48, 0x60, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x88, 0x88 } }

These default values for the DNS server are Google's public DNS: https://developers.google.com/speed/public-dns/docs/using

Referenced by resolv_getserver().

process_event_t resolv_event_found

Event that is broadcasted when a DNS name has been resolved.

Referenced by PROCESS_THREAD(), and resolv_found().

char resolv_hostname[RESOLV_CONF_MAX_DOMAIN_NAME_SIZE+1]

static

Referenced by mdns_prep_host_announce_packet(), mdns_write_announce_records(), newdata(), PROCESS_THREAD(), resolv_found(), resolv_get_hostname(), resolv_query(), and resolv_set_hostname().

const uip_ipaddr_t resolv_mdns_addr

static

Initial value:

=

  { { 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfb } }

struct etimer retry

static

Referenced by check_entries().

struct etimer retry

static

Referenced by check_entries().

uint8_t seqno

static

Referenced by mdns_query().

uint8_t seqno

static

Referenced by resolv_query(), send_packet(), send_rerr(), and send_rrep().