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DNSServer refactoring, switch to AsyncUDP #7482

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Merged
merged 11 commits into from
Dec 18, 2023
Merged

DNSServer refactoring, switch to AsyncUDP #7482

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9f08964
DNSServer: switch to AsyncUDP instead of WiFiUDP
vortigont Nov 15, 2022
d8b8993
DNSServer code refactoring
vortigont Nov 16, 2022
e50dfef
DNSServer drop dynamically allocated member structs
vortigont Nov 16, 2022
545a946
DNSServer: labels min length checks, simplified labels parser
vortigont Nov 20, 2022
5daade1
DNSServer use default settings for catch-all setup
vortigont Dec 11, 2022
77fbc2a
CaptivePortal example refactored
vortigont Dec 11, 2022
4998243
DNSServer status getters added
vortigont Dec 22, 2022
97b8bf9
Merge branch 'master' into dnssrvasync
vortigont Apr 28, 2023
19b25c2
Merge branch 'master' into dnssrvasync
vortigont Aug 8, 2023
c0e48f8
Merge branch 'master' into dnssrvasync
lucasssvaz Nov 27, 2023
c5c8636
Merge branch 'master' into dnssrvasync
me-no-dev Dec 18, 2023
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81 changes: 44 additions & 37 deletions libraries/DNSServer/examples/CaptivePortal/CaptivePortal.ino
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Original file line number Diff line number Diff line change
@@ -1,52 +1,59 @@
/*
This example enables catch-all Captive portal for ESP32 Access-Point
It will allow modern devices/OSes to detect that WiFi connection is
limited and offer a user to access a banner web-page.
There is no need to find and open device's IP address/URL, i.e. http://192.168.4.1/
This works for Android, Ubuntu, FireFox, Windows, maybe others...
*/

#include <Arduino.h>
#include <WiFi.h>
#include <DNSServer.h>
#include <WebServer.h>


const byte DNS_PORT = 53;
IPAddress apIP(8,8,4,4); // The default android DNS
DNSServer dnsServer;
WiFiServer server(80);
WebServer server(80);

static const char responsePortal[] = R"===(
<!DOCTYPE html><html><head><title>ESP32 CaptivePortal</title></head><body>
<h1>Hello World!</h1><p>This is a captive portal example page. All unknown http requests will
be redirected here.</p></body></html>
)===";

// index page handler
void handleRoot() {
server.send(200, "text/plain", "Hello from esp32!");
}

String responseHTML = ""
"<!DOCTYPE html><html><head><title>CaptivePortal</title></head><body>"
"<h1>Hello World!</h1><p>This is a captive portal example. All requests will "
"be redirected here.</p></body></html>";
// this will redirect unknown http req's to our captive portal page
// based on this redirect various systems could detect that WiFi AP has a captive portal page
void handleNotFound() {
server.sendHeader("Location", "/portal");
server.send(302, "text/plain", "redirect to captive portal");
}

void setup() {
void setup() {
Serial.begin(115200);
WiFi.mode(WIFI_AP);
WiFi.softAP("ESP32-DNSServer");
WiFi.softAPConfig(apIP, apIP, IPAddress(255, 255, 255, 0));

// if DNSServer is started with "*" for domain name, it will reply with
// provided IP to all DNS request
dnsServer.start(DNS_PORT, "*", apIP);
// by default DNSServer is started serving any "*" domain name. It will reply
// AccessPoint's IP to all DNS request (this is requred for Captive Portal detection)
dnsServer.start();

// serve a simple root page
server.on("/", handleRoot);

// serve portal page
server.on("/portal",[](){server.send(200, "text/html", responsePortal);});

// all unknown pages are redirected to captive portal
server.onNotFound(handleNotFound);
server.begin();
}

void loop() {
dnsServer.processNextRequest();
WiFiClient client = server.available(); // listen for incoming clients

if (client) {
String currentLine = "";
while (client.connected()) {
if (client.available()) {
char c = client.read();
if (c == '\n') {
if (currentLine.length() == 0) {
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println();
client.print(responseHTML);
break;
} else {
currentLine = "";
}
} else if (c != '\r') {
currentLine += c;
}
}
}
client.stop();
}
server.handleClient();
delay(5); // give CPU some idle time
}
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