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Make DNS resolution order selectable during runtime or compile time (#6865)

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* Make DNS resolution order selectable during runtime or compile time (only in dual stack mode).

* Extend IPv6 example to show usage of new hostByName function with selectable resolving order

* Fix function definition of fqdn_rt in IPv6.ino.

* Fix function call.

* Fix missing bracket...

* Only run if built with dual stack support

* Make DNS resolution order selectable during runtime or compile time (only in dual stack mode).

* Extend IPv6 example to show usage of new hostByName function with selectable resolving order

* Fix function definition of fqdn_rt in IPv6 example.

* Implement enum class for resolve type

* Fix example IPv6.ino

* Fix typedef in ESP8266WiFiGeneric.h function call

* Change enum class definition to not depend on lwip/dns.h

* Move err_t err definition outside switch. Fix typecast.

* Always define DNSResolveType as pio test otherwise failes even if the enum class isn't used.

Co-authored-by: altelch <heiko.krupp@rhrk.uni-kl.de>
Co-authored-by: david gauchard <gauchard@laas.fr>
This commit is contained in:
Heiko Krupp
2020-04-09 18:17:54 +02:00
committed by GitHub
parent bc170e6d63
commit fad056442d
3 changed files with 88 additions and 4 deletions
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24
libraries/ESP8266WiFi/examples/IPv6/IPv6.ino
View File

@ -1,4 +1,3 @@
/*
arduino IPv6 example
released to public domain
@ -27,7 +26,8 @@
#define STAPSK "your-password"
#endif
#define FQDN F("www.google.com") // with both IPv4 & IPv6 addresses
#define FQDN F("www.google.com") // with both IPv4 & IPv6 addresses
#define FQDN2 F("www.yahoo.com") // with both IPv4 & IPv6 addresses
#define FQDN6 F("ipv6.google.com") // does not resolve in IPv4
#define STATUSDELAY_MS 10000
#define TCP_PORT 23
@ -50,6 +50,21 @@ void fqdn(Print& out, const String& fqdn) {
}
}
#if LWIP_IPV4 && LWIP_IPV6
void fqdn_rt(Print& out, const String& fqdn, DNSResolveType resolveType) {
out.print(F("resolving "));
out.print(fqdn);
out.print(F(": "));
IPAddress result;
if (WiFi.hostByName(fqdn.c_str(), result, 10000, resolveType)) {
result.printTo(out);
out.println();
} else {
out.println(F("timeout or not found"));
}
}
#endif
void status(Print& out) {
out.println(F("------------------------------"));
out.println(ESP.getFullVersion());
@ -85,7 +100,10 @@ void status(Print& out) {
// an example is provided with a fqdn which does not resolve with IPv4
fqdn(out, FQDN);
fqdn(out, FQDN6);
#if LWIP_IPV4 && LWIP_IPV6
fqdn_rt(out, FQDN, DNSResolveType::DNS_AddrType_IPv4_IPv6); // IPv4 before IPv6
fqdn_rt(out, FQDN2, DNSResolveType::DNS_AddrType_IPv6_IPv4); // IPv6 before IPv4
#endif
out.println(F("------------------------------"));
}