lwIP  2.0.2
Lightweight IP stack
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
pbufPointer to pbuf with the partially constructed DNS packet
offsetStart 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.
domainThe 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
domainThe domain to add a label to
labelThe label to add, like <hostname>, 'local', 'com' or ''
lenThe 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
aDomain name to compare 1
bDomain 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
pThe packet
offsetstart position of domain name in packet
domainThe domain name destination
Returns
The new offset after the domain, or MDNS_READNAME_ERROR if reading failed