mdns.c File Reference

#include "lwip/apps/mdns.h"
#include "lwip/apps/mdns_priv.h"
#include "lwip/netif.h"
#include "lwip/udp.h"
#include "lwip/ip_addr.h"
#include "lwip/mem.h"
#include "lwip/prot/dns.h"
#include <string.h>
#include "lwip/igmp.h"
#include "lwip/mld6.h"

Data Structures
struct	mdns_service
struct	mdns_host
struct	mdns_packet
struct	mdns_outpacket
struct	mdns_rr_info

Functions
err_t	mdns_domain_add_label (struct mdns_domain *domain, const char *label, u8_t len)
u16_t	mdns_readname (struct pbuf *p, u16_t offset, struct mdns_domain *domain)
int	mdns_domain_eq (struct mdns_domain *a, struct mdns_domain *b)
u16_t	mdns_compress_domain (struct pbuf *pbuf, u16_t *offset, struct mdns_domain *domain)
void	mdns_resp_init (void)
void	mdns_resp_netif_settings_changed (struct netif *netif)
err_t	mdns_resp_add_netif (struct netif *netif, const char *hostname, u32_t dns_ttl)
err_t	mdns_resp_remove_netif (struct netif *netif)
err_t	mdns_resp_add_service (struct netif *netif, const char *name, const char *service, enum mdns_sd_proto proto, u16_t port, u32_t dns_ttl, service_get_txt_fn_t txt_fn, void *txt_data)
err_t	mdns_resp_add_service_txtitem (struct mdns_service *service, const char *txt, u8_t txt_len)

Detailed Description

MDNS responder implementation

Function Documentation

mdns_compress_domain()

u16_t mdns_compress_domain	(	struct pbuf *	pbuf,
		u16_t *	offset,
		struct mdns_domain *	domain
	)

Return bytes needed to write before jump for best result of compressing supplied domain against domain in outpacket starting at specified offset. If a match is found, offset is updated to where to jump to

Parameters

pbuf	Pointer to pbuf with the partially constructed DNS packet
offset	Start position of a domain written earlier. If this location is suitable for compression, the pointer is updated to where in the domain to jump to.
domain	The domain to write

Returns

Number of bytes to write of the new domain before writing a jump to the offset. If compression can not be done against this previous domain name, the full new domain length is returned.

mdns_domain_add_label()

err_t mdns_domain_add_label	(	struct mdns_domain *	domain,
		const char *	label,
		u8_t	len
	)

Add a label part to a domain

Parameters

domain	The domain to add a label to
label	The label to add, like <hostname>, 'local', 'com' or ''
len	The length of the label

Returns

ERR_OK on success, an err_t otherwise if label too long

mdns_domain_eq()

int mdns_domain_eq	(	struct mdns_domain *	a,
		struct mdns_domain *	b
	)

Return 1 if contents of domains match (case-insensitive)

Parameters

a	Domain name to compare 1
b	Domain name to compare 2

Returns

1 if domains are equal ignoring case, 0 otherwise

mdns_readname()

u16_t mdns_readname	(	struct pbuf *	p,
		u16_t	offset,
		struct mdns_domain *	domain
	)

Read possibly compressed domain name from packet buffer

Parameters

p	The packet
offset	start position of domain name in packet
domain	The domain name destination

Returns

The new offset after the domain, or MDNS_READNAME_ERROR if reading failed