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mDNS-responder: ipv6 support and fixes

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* Adds ipv6 support. Compiles with ipv6 enabled and then accepts ipv6
  connections and answers AAAA questions.

* Fixes a few overflows of the reply buffer. Reduce the default reply buffer
  size, name it MDNS_RESPONDER_REPLY_SIZE, and allow overriding.

* Fix mdns_add_TXT.

* Prefer malloc to large stack buffers, to control stack sizes, and try to
  malloc only the buffer size needed where known in advance.

* Determine the IP addresses when responding, eliminating the update function
  and the update task.

* Allow use in SoftAP and StationAP mode too.

* Fix to compile without the debug output.

* Slightly better integration with lwip.

* Accept a NULL TXT entry.

* Some code style changes, not comprehensive.
This commit is contained in:
Our Air Quality 2017-12-07 11:50:43 +11:00
parent 61f23d0cf4
commit 85338ee672
2 changed files with 340 additions and 249 deletions
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26
extras/mdnsresponder/mdnsresponder.h
View file

@ -1,20 +1,25 @@
#ifndef __MDNSRESPONDER_H__
#define __MDNSRESPONDER_H__
#include <lwip/ip_addr.h>
/*
* Basic multicast DNS responder
*
* Advertises the IP address, port, and characteristics of a service to other devices using multicast DNS on the same LAN,
* so they can find devices with addresses dynamically allocated by DHCP. See avahi, Bonjour, etc
* See RFC6762, RFC6763
* Advertises the IP address, port, and characteristics of a service to other
* devices using multicast DNS on the same LAN, so they can find devices with
* addresses dynamically allocated by DHCP. See avahi, Bonjour, etc See RFC6762,
* RFC6763
*
* This sample code is in the public domain.
*
* by M J A Hamel 2016
*/
#ifndef __MDNSRESPONDER_H__
#define __MDNSRESPONDER_H__
#include <lwip/ip_addr.h>
/* The default maximum reply size, increase as necessary. */
#ifndef MDNS_RESPONDER_REPLY_SIZE
#define MDNS_RESPONDER_REPLY_SIZE 320
#endif
// Starts the mDNS responder task, call first
void mdns_init();
@ -42,7 +47,10 @@ void mdns_add_facility( const char* instanceName, // Short user-friendly insta
void mdns_add_PTR(const char* rKey, u32_t ttl, const char* nameStr);
void mdns_add_SRV(const char* rKey, u32_t ttl, u16_t rPort, const char* targname);
void mdns_add_TXT(const char* rKey, u32_t ttl, const char* txtStr);
void mdns_add_A (const char* rKey, u32_t ttl, ip_addr_t addr);
void mdns_add_A (const char* rKey, u32_t ttl, const ip4_addr_t *addr);
#if LWIP_IPV6
void mdns_add_AAAA(const char* rKey, u32_t ttl, const ip6_addr_t *addr);
#endif
/* Sample usage, advertising a secure web service