tinyservices.h File Reference

Tiny DNS Server.

Copyright (c) 2016-2018 Microchip Technology Inc. and its subsidiaries.

#include "lwip/ip_addr.h"
#include "lwip/pbuf.h"
#include "lwip/sys.h"

Data Structures
struct	label_t

Macros
#define	COMPRESSED_STR_SIZE   (2)
#define	DHCP_OPTION_DOMAIN_NAME   15
#define	DHCP_OPTION_VENDOR_SPECIFIC_INFO   43
#define	DHCP_RESPONSE_DEFAULT_SIZE   (512)
	Handle slightly smaller response than standard implementations. More...
#define	DNS_ANCOUNT_OFFSET   (6)
#define	DNS_ARCOUNT_OFFSET   (10)
#define	DNS_CLIENT_PORT   (53000)
	DNS client port is set to 53000. More...
#define	DNS_DEFAULT_REQUEST_LEN   (300)
	Default to slightly smaller DNS request than normal. More...
#define	DNS_FLAG1_AUTHORATIVE   0x04
#define	DNS_FLAG1_OPCODE_INVERSE   0x08
#define	DNS_FLAG1_OPCODE_STANDARD   0x00
#define	DNS_FLAG1_OPCODE_STATUS   0x10
#define	DNS_FLAG1_RD   0x01
#define	DNS_FLAG1_RESPONSE   0x80
#define	DNS_FLAG1_TRUNC   0x02
#define	DNS_FLAG2_ERR_MASK   0x0f
#define	DNS_FLAG2_ERR_NAME   0x03
#define	DNS_FLAG2_ERR_NONE   0x00
#define	DNS_FLAG2_RA   0x80
#define	DNS_FLAGS_OFFSET   (2)
#define	DNS_NSCOUNT_OFFSET   (8)
#define	DNS_QDCOUNT_OFFSET   (4)
#define	DNS_RESPONSE_DEFAULT_SIZE   (512)
	Handle default DNS Response size. More...
#define	DNS_RRCLASS_IN   1 /* internet class */
#define	DNS_RRTYPE_A   1 /* a host address */
#define	DNS_RRTYPE_AAAA   (28)
#define	DNS_RRTYPE_CNAME   5 /* the canonical name for an alias */
#define	DNS_RRTYPE_NS   2 /* an authoritative name server */
#define	DNS_RRTYPE_PTR   12 /* a domain name pointer */
#define	DNS_RRTYPE_SRV   33 /* a service locator */
#define	DNS_RRTYPE_TXT   16 /* arbitrary text - used by DNS-SD and others */
#define	DNS_RTYPE_A_FLAG   (1 << 0)
#define	DNS_RTYPE_NS_FLAG   (1 << 1)
#define	DNS_RTYPE_PTR_FLAG   (1 << 2)
#define	DNS_RTYPE_SRV_FLAG   (1 << 3)
#define	DNS_RTYPE_TXT_FLAG   (1 << 4)
#define	DNS_SD   "_dns-sd"
#define	DNS_SD_RR   SERVICES "." DNS_SD "." UDP_PROTO "." LOCAL_DOMAIN
#define	DNS_SERVER_PORT   (53)
#define	DNS_SRV_PRIORITY   0
#define	DNS_SRV_WEIGHT   0
#define	DNS_TID_OFFSET   (0)
#define	HTTP_SRV   "_http"
#define	HTTP_SRV_LOCAL_NAME_RR   HTTP_SRV_LOCAL_NAME "." HTTP_SRV "." TCP_PROTO "." LOCAL_DOMAIN
#define	HTTP_SRV_RR   HTTP_SRV "." TCP_PROTO "." LOCAL_DOMAIN
#define	HTTP_SRV_SHORT_NAME_RR   HTTP_SRV_LOCAL_NAME "." LOCAL_DOMAIN
#define	LOCAL_DOMAIN   "local"
#define	MDNS_ADDR_IP   _tiny_ip4_addr(MDNS_ADDRESS)
#define	MDNS_ADDRESS   224, 0, 0, 251
#define	MDNS_PORT   (5353)
#define	MFI_RR   "_mfi-config." TCP_PROTO "." LOCAL_DOMAIN
#define	MFI_SRV_LOCAL_NAME_RR   HTTP_SRV_LOCAL_NAME "." MFI_RR
#define	MSG_COMPRESSION_FLAGS   (0xc0)
#define	MSG_COMPRESSION_FLAGS16   (0xc000)
#define	MSG_OFFSET_MASK   (0x3FF)
#define	QUERY_STRING_LEN   (30)
#define	SERVICES   "_services"
#define	SIZEOF_ANCOUNTFIELD   (2)
#define	SIZEOF_ARCOUNTFIELD   (2)
#define	SIZEOF_CLASSFIELD   (2)
#define	SIZEOF_DNS_HDR   (12)
#define	SIZEOF_IPADDR   (4)
#define	SIZEOF_LENFIELD   (2)
#define	SIZEOF_MIN_DNS_QUERY   (5)
#define	SIZEOF_MIN_DNS_STR   (2)
#define	SIZEOF_NSCOUNTFIELD   (2)
#define	SIZEOF_PORTFIELD   (2)
#define	SIZEOF_PRIOFIELD   (2)
#define	SIZEOF_QDCOUNTFIELD   (2)
#define	SIZEOF_SRV_PORTFIELD   (2)
#define	SIZEOF_SRV_PRIORITYFIELD   (2)
#define	SIZEOF_SRV_RDATA_HDR   (SIZEOF_SRV_PRIORITYFIELD + SIZEOF_SRV_WEIGHTFIELD + SIZEOF_SRV_PORTFIELD)
#define	SIZEOF_SRV_WEIGHTFIELD   (2)
#define	SIZEOF_TTLFIELD   (4)
#define	SIZEOF_TYPEFIELD   (2)
#define	SIZEOF_WEIGHTFIELD   (2)
#define	TCP_PROTO   "_tcp"
#define	TINY_DNS_CLIENT_TIMEOUT   (5000) /* default to 5 seconds */
#define	UDP_PROTO   "_udp"

Typedefs
typedef enum dns_transmission_type	dns_transmission_type_t
typedef enum subqry	subqry_t

Enumerations
enum	dns_transmission_type {   DNS_MULTICAST,   DNS_UNICAST }
enum	subqry {   DNS_QRY_REVERSE_NAME_LOOKUP_FOR_LOCAL_IP,   DNS_QRY_HTTP_LOCAL,   DNS_QRY_DNS_SD_LOCAL,   DNS_QRY_MFI_LOCAL,   DNS_QRY_UNKNOWN,   DNS_QRY_NONE }

Functions
static ip_addr_t	_tiny_ip4_addr (uint8_t a, uint8_t b, uint8_t c, uint8_t d)
uint32_t	lwip_dns_hton_string (struct pbuf *pbuf, uint32_t offset, char const *name, bool flag, uint32_t *plen)
	Put host name into DNS RDATA format. More...
uint32_t	pbuf_read16be (struct pbuf *pbuf, uint32_t offset, uint16_t *pval)
	Read two bytes (big-endian) from a pbuf. More...
uint32_t	pbuf_read32le (struct pbuf *pbuf, uint32_t offset, uint32_t *pval)
	Read four bytes (little-endian) from a pbuf. More...
uint32_t	pbuf_read8 (struct pbuf *pbuf, uint32_t offset, uint8_t *pval)
	Read a byte from a pbuf. More...
static uint32_t	pbuf_read_ip (struct pbuf *pbuf, uint32_t offset, ip_addr_t *p_addr)
err_t	pbuf_take_partial (struct pbuf *buf, uint32_t offset, const void *dataptr, u16_t len)
	Copy application supplied data into a pbuf. More...
uint32_t	pbuf_write16be (struct pbuf *pbuf, uint32_t offset, uint16_t val)
	Write two bytes (big-endian) to a pbuf. More...
uint32_t	pbuf_write32be (struct pbuf *pbuf, uint32_t offset, uint32_t val)
	Write four bytes (big-endian) to a pbuf. More...
uint32_t	pbuf_write32le (struct pbuf *pbuf, uint32_t offset, uint32_t val)
	Write four bytes (little-endian) to a pbuf. More...
uint32_t	pbuf_write8 (struct pbuf *pbuf, uint32_t offset, uint8_t val)
	Write a byte to a pbuf. More...
static uint32_t	pbuf_write_ip (struct pbuf *pbuf, uint32_t offset, ip_addr_t addr)

#define COMPRESSED_STR_SIZE   (2)

#define DHCP_OPTION_DOMAIN_NAME   15

#define DHCP_OPTION_VENDOR_SPECIFIC_INFO   43

#define DHCP_RESPONSE_DEFAULT_SIZE   (512)

Handle slightly smaller response than standard implementations.

#define DNS_ANCOUNT_OFFSET   (6)

#define DNS_ARCOUNT_OFFSET   (10)

#define DNS_CLIENT_PORT   (53000)

DNS client port is set to 53000.

#define DNS_DEFAULT_REQUEST_LEN   (300)

Default to slightly smaller DNS request than normal.

#define DNS_FLAG1_AUTHORATIVE   0x04

#define DNS_FLAG1_OPCODE_INVERSE   0x08

#define DNS_FLAG1_OPCODE_STANDARD   0x00

#define DNS_FLAG1_OPCODE_STATUS   0x10

#define DNS_FLAG1_RD   0x01

#define DNS_FLAG1_RESPONSE   0x80

#define DNS_FLAG1_TRUNC   0x02

#define DNS_FLAG2_ERR_MASK   0x0f

#define DNS_FLAG2_ERR_NAME   0x03

#define DNS_FLAG2_ERR_NONE   0x00

#define DNS_FLAG2_RA   0x80

#define DNS_FLAGS_OFFSET   (2)

#define DNS_NSCOUNT_OFFSET   (8)

#define DNS_QDCOUNT_OFFSET   (4)

#define DNS_RESPONSE_DEFAULT_SIZE   (512)

Handle default DNS Response size.

#define DNS_RRCLASS_IN   1 /* internet class */

#define DNS_RRTYPE_A   1 /* a host address */

#define DNS_RRTYPE_AAAA   (28)

#define DNS_RRTYPE_CNAME   5 /* the canonical name for an alias */

#define DNS_RRTYPE_NS   2 /* an authoritative name server */

#define DNS_RRTYPE_PTR   12 /* a domain name pointer */

#define DNS_RRTYPE_SRV   33 /* a service locator */

#define DNS_RRTYPE_TXT   16 /* arbitrary text - used by DNS-SD and others */

#define DNS_RTYPE_A_FLAG   (1 << 0)

#define DNS_RTYPE_NS_FLAG   (1 << 1)

#define DNS_RTYPE_PTR_FLAG   (1 << 2)

#define DNS_RTYPE_SRV_FLAG   (1 << 3)

#define DNS_RTYPE_TXT_FLAG   (1 << 4)

#define DNS_SD   "_dns-sd"

#define DNS_SD_RR   SERVICES "." DNS_SD "." UDP_PROTO "." LOCAL_DOMAIN

#define DNS_SERVER_PORT   (53)

#define DNS_SRV_PRIORITY   0

#define DNS_SRV_WEIGHT   0

#define DNS_TID_OFFSET   (0)

#define HTTP_SRV   "_http"

#define HTTP_SRV_LOCAL_NAME_RR   HTTP_SRV_LOCAL_NAME "." HTTP_SRV "." TCP_PROTO "." LOCAL_DOMAIN

#define HTTP_SRV_RR   HTTP_SRV "." TCP_PROTO "." LOCAL_DOMAIN

#define HTTP_SRV_SHORT_NAME_RR   HTTP_SRV_LOCAL_NAME "." LOCAL_DOMAIN

#define LOCAL_DOMAIN   "local"

#define MDNS_ADDR_IP   _tiny_ip4_addr(MDNS_ADDRESS)

#define MDNS_ADDRESS   224, 0, 0, 251

#define MDNS_PORT   (5353)

#define MFI_RR   "_mfi-config." TCP_PROTO "." LOCAL_DOMAIN

#define MFI_SRV_LOCAL_NAME_RR   HTTP_SRV_LOCAL_NAME "." MFI_RR

#define MSG_COMPRESSION_FLAGS   (0xc0)

#define MSG_COMPRESSION_FLAGS16   (0xc000)

#define MSG_OFFSET_MASK   (0x3FF)

#define QUERY_STRING_LEN   (30)

#define SERVICES   "_services"

#define SIZEOF_ANCOUNTFIELD   (2)

#define SIZEOF_ARCOUNTFIELD   (2)

#define SIZEOF_CLASSFIELD   (2)

#define SIZEOF_DNS_HDR   (12)

#define SIZEOF_IPADDR   (4)

#define SIZEOF_LENFIELD   (2)

#define SIZEOF_MIN_DNS_QUERY   (5)

#define SIZEOF_MIN_DNS_STR   (2)

#define SIZEOF_NSCOUNTFIELD   (2)

#define SIZEOF_PORTFIELD   (2)

#define SIZEOF_PRIOFIELD   (2)

#define SIZEOF_QDCOUNTFIELD   (2)

#define SIZEOF_SRV_PORTFIELD   (2)

#define SIZEOF_SRV_PRIORITYFIELD   (2)

#define SIZEOF_SRV_RDATA_HDR   (SIZEOF_SRV_PRIORITYFIELD + SIZEOF_SRV_WEIGHTFIELD + SIZEOF_SRV_PORTFIELD)

#define SIZEOF_SRV_WEIGHTFIELD   (2)

#define SIZEOF_TTLFIELD   (4)

#define SIZEOF_TYPEFIELD   (2)

#define SIZEOF_WEIGHTFIELD   (2)

#define TCP_PROTO   "_tcp"

#define TINY_DNS_CLIENT_TIMEOUT   (5000) /* default to 5 seconds */

#define UDP_PROTO   "_udp"

typedef enum dns_transmission_type dns_transmission_type_t

typedef enum subqry subqry_t

enum dns_transmission_type

Enumerator
DNS_MULTICAST
DNS_UNICAST

enum subqry

Enumerator
DNS_QRY_REVERSE_NAME_LOOKUP_FOR_LOCAL_IP
DNS_QRY_HTTP_LOCAL
DNS_QRY_DNS_SD_LOCAL
DNS_QRY_MFI_LOCAL
DNS_QRY_UNKNOWN
DNS_QRY_NONE

static ip_addr_t _tiny_ip4_addr ( uint8_t  a, uint8_t  b, uint8_t  c, uint8_t  d  )

inlinestatic

References IP4_ADDR.

uint32_t lwip_dns_hton_string	(	struct pbuf *	pbuf,
		uint32_t	offset,
		char const *	name,
		bool	flag,
		uint32_t *	plen
	)

Put host name into DNS RDATA format.

uint32_t pbuf_read16be	(	struct pbuf *	pbuf,
		uint32_t	offset,
		uint16_t *	pval
	)

Read two bytes (big-endian) from a pbuf.

If the read is beyond the end of the pbuf chain's payload, then return an error instead.

Parameters

buf	pbuf to read data from.
offset	logical offset into pbuf to start reading from
pval	memory to place the read bytes into.

Returns

0 if successful, 1 if the read offset is beyond the end of the pbuf chain's total length.

References _wifi_get16_be(), buffer, pbuf_copy_partial(), and pbuf::tot_len.

uint32_t pbuf_read32le	(	struct pbuf *	pbuf,
		uint32_t	offset,
		uint32_t *	pval
	)

Read four bytes (little-endian) from a pbuf.

If the requested read is beyond the * end of the pbuf chain's payload, then this function does not perform the read. It returns an error instead.

Parameters

buf	pbuf to read data from.
offset	logical offset into pbuf to start reading from.
val	the data to read from the pbuf.

Returns

0 if successful, 1 if the read offset is beyond the end of the pbuf chain's total length.

References _wifi_get32_le(), pbuf_copy_partial(), and pbuf::tot_len.

Referenced by pbuf_read_ip().

uint32_t pbuf_read8	(	struct pbuf *	pbuf,
		uint32_t	offset,
		uint8_t *	pval
	)

Read a byte from a pbuf.

If the read is beyond the end of the pbuf chain's payload, then return an error instead.

Parameters

buf	pbuf to read data from.
offset	logical offset into pbuf to start reading from
pval	memory to place the read byte into.

Returns

0 if successful, 1 if the read offset is beyond the end of the pbuf chain's total length.

References pbuf_get_at(), and pbuf::tot_len.

static uint32_t pbuf_read_ip ( struct pbuf *  pbuf, uint32_t  offset, ip_addr_t *  p_addr  )

inlinestatic

References pbuf_read32le().

err_t pbuf_take_partial	(	struct pbuf *	pbuf,
		uint32_t	offset,
		const void *	dataptr,
		u16_t	len
	)

Copy application supplied data into a pbuf.

This function can only be used to copy the equivalent of buf->tot_len data.

Parameters

buf	pbuf to fill with data
offset	logical offset into pbuf to start writing data into
dataptr	application supplied data buffer
len	length of the application supplied data buffer

Returns

ERR_OK if successful, ERR_MEM if the pbuf is not big enough

References Assert, ERR_ARG, ERR_OK, pbuf::len, pbuf::next, NULL, and pbuf::payload.

Referenced by pbuf_write16be(), pbuf_write32be(), pbuf_write32le(), and pbuf_write8().

uint32_t pbuf_write16be	(	struct pbuf *	pbuf,
		uint32_t	offset,
		uint16_t	val
	)

Write two bytes (big-endian) to a pbuf.

If the requested write is beyond the * end of the pbuf chain's payload, then this function does not perform the write. It returns an error instead.

Parameters

buf	pbuf to write data to.
offset	logical offset into pbuf to start writing to.
val	the data to write to the pbuf.

Returns

0 if successful, 1 if the write offset is beyond the end of the pbuf chain's total length.

References _wifi_put16_be(), ERR_OK, pbuf_take_partial(), and pbuf::tot_len.

uint32_t pbuf_write32be	(	struct pbuf *	pbuf,
		uint32_t	offset,
		uint32_t	val
	)

Write four bytes (big-endian) to a pbuf.

If the requested write is beyond the * end of the pbuf chain's payload, then this function does not perform the write. It returns an error instead.

Parameters

buf	pbuf to write data to.
offset	logical offset into pbuf to start writing to.
val	the data to write to the pbuf.

Returns

0 if successful, 1 if the write offset is beyond the end of the pbuf chain's total length.

References _wifi_put32_be(), ERR_OK, pbuf_take_partial(), and pbuf::tot_len.

uint32_t pbuf_write32le	(	struct pbuf *	pbuf,
		uint32_t	offset,
		uint32_t	val
	)

Write four bytes (little-endian) to a pbuf.

If the requested write is beyond the * end of the pbuf chain's payload, then this function does not perform the write. It returns an error instead.

Parameters

buf	pbuf to write data to.
offset	logical offset into pbuf to start writing to.
val	the data to write to the pbuf.

Returns

0 if successful, 1 if the write offset is beyond the end of the pbuf chain's total length.

References _wifi_put32_le(), ERR_OK, pbuf_take_partial(), and pbuf::tot_len.

Referenced by pbuf_write_ip().

uint32_t pbuf_write8	(	struct pbuf *	pbuf,
		uint32_t	offset,
		uint8_t	val
	)

Write a byte to a pbuf.

If the requested write is beyond the end of the pbuf chain's payload, then this function does not perform the write. It returns an error instead.

Parameters

buf	pbuf to write data to.
offset	logical offset into pbuf to start writing to.
val	the data to write to the pbuf.

Returns

0 if successful, 1 if the write offset is beyond the end of the pbuf chain's total length.

References ERR_OK, pbuf_take_partial(), and pbuf::tot_len.

static uint32_t pbuf_write_ip ( struct pbuf *  pbuf, uint32_t  offset, ip_addr_t  addr  )

inlinestatic

References pbuf_write32le().