initial commit

README.md

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+# @BayernWLAN login with ESP
+
+This repository contains two example how to log in to the captive portal of `@BayernWLAN` wifi networks using an ESP.
+
+Normally after connecting to the network you would click the connect button in the captive portal of your browser to get access to the internet.
+
+![Captive Portal](images/captive-portal.png)
+
+Of course this is difficult to do with the ESP since you have neither a web browser with a graphical interface, nor a mouse to click any buttons.
+
+Instead, we can emulate the click on the button by sending a specific `HTTP GET` request to the access point.
+
+There is [one example][micropython-example] for use with MicroPython and a [second example][arduino-example] for the Arduino IDEBoards Manager.
+The arduino code uses the libraries `HTTPClient.h` and `WiFi.h` which should be built-in.
+
+[micropython-example]: example_micropython.py
+[arduino-example]: example_arduino.ino

example_arduino.ino

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+/* 
+ *  Example of how to log in to captive portal of @BayernWLAN with an 
+ *  ESP32
+ *  
+ *  The program connect to the @BayernWLAN wifi and sends a HTTP request
+ *  that emulates the click on the Connect button in the captive portal.
+ * 
+ */
+
+#include <WiFi.h>
+#include <HTTPClient.h>
+
+const char* ssid = "@BayernWLAN"; //Enter SSID
+const char* password = "";
+
+// root certificate for the vodafone hotspot
+const char* root_ca= \
+"-----BEGIN CERTIFICATE-----\n"
+"MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh\n"
+"MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3\n"
+"d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBD\n"
+"QTAeFw0wNjExMTAwMDAwMDBaFw0zMTExMTAwMDAwMDBaMGExCzAJBgNVBAYTAlVT\n"
+"MRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5j\n"
+"b20xIDAeBgNVBAMTF0RpZ2lDZXJ0IEdsb2JhbCBSb290IENBMIIBIjANBgkqhkiG\n"
+"9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4jvhEXLeqKTTo1eqUKKPC3eQyaKl7hLOllsB\n"
+"CSDMAZOnTjC3U/dDxGkAV53ijSLdhwZAAIEJzs4bg7/fzTtxRuLWZscFs3YnFo97\n"
+"nh6Vfe63SKMI2tavegw5BmV/Sl0fvBf4q77uKNd0f3p4mVmFaG5cIzJLv07A6Fpt\n"
+"43C/dxC//AH2hdmoRBBYMql1GNXRor5H4idq9Joz+EkIYIvUX7Q6hL+hqkpMfT7P\n"
+"T19sdl6gSzeRntwi5m3OFBqOasv+zbMUZBfHWymeMr/y7vrTC0LUq7dBMtoM1O/4\n"
+"gdW7jVg/tRvoSSiicNoxBN33shbyTApOB6jtSj1etX+jkMOvJwIDAQABo2MwYTAO\n"
+"BgNVHQ8BAf8EBAMCAYYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUA95QNVbR\n"
+"TLtm8KPiGxvDl7I90VUwHwYDVR0jBBgwFoAUA95QNVbRTLtm8KPiGxvDl7I90VUw\n"
+"DQYJKoZIhvcNAQEFBQADggEBAMucN6pIExIK+t1EnE9SsPTfrgT1eXkIoyQY/Esr\n"
+"hMAtudXH/vTBH1jLuG2cenTnmCmrEbXjcKChzUyImZOMkXDiqw8cvpOp/2PV5Adg\n"
+"06O/nVsJ8dWO41P0jmP6P6fbtGbfYmbW0W5BjfIttep3Sp+dWOIrWcBAI+0tKIJF\n"
+"PnlUkiaY4IBIqDfv8NZ5YBberOgOzW6sRBc4L0na4UU+Krk2U886UAb3LujEV0ls\n"
+"YSEY1QSteDwsOoBrp+uvFRTp2InBuThs4pFsiv9kuXclVzDAGySj4dzp30d8tbQk\n"
+"CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=\n"
+"-----END CERTIFICATE-----\n";
+
+void setup() {
+    Serial.begin(115200);
+
+    // Connect to wifi
+    WiFi.begin(ssid, password);
+
+    // Wait some time to connect to wifi
+    for(int i = 0; i < 10 && WiFi.status() != WL_CONNECTED; i++) {
+        Serial.print(".");
+        delay(1000);
+    }
+    Serial.println("WiFi connected!");
+
+    // Send HTTP request for login
+    HTTPClient http;
+    http.begin("hotspot.vodafone.de", 443, "/api/v4/login?loginProfile=6", root_ca);
+    String payload = String("Accept: */*\r\n\r\n");
+    size_t payload_size = payload.length();
+    int httpCode = http.sendRequest("GET", (uint8_t *) payload.c_str(), payload_size);
+
+    if (httpCode > 0) { //Check for the returning code
+       String payload = http.getString();
+       Serial.println(httpCode);
+       Serial.println(payload);
+    }
+    else {
+       Serial.println("Error on HTTP request");
+       Serial.println(httpCode);
+    }
+
+    http.end();
+    
+    Serial.println("IP address: ");
+    Serial.println(WiFi.localIP());
+}
+
+void loop() {
+
+}

example_micropython.py

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+import network
+import ussl
+import socket
+import time
+
+def sock(host, port, ssl = False):
+    s = socket.socket()
+    ai = socket.getaddrinfo(host, port)
+    addr = ai[0][-1]
+    s.connect(addr)
+    if ssl:
+        return ussl.wrap_socket(s)
+    else:
+        return s
+
+def http_get(sock, host, path):
+    sock.write(("GET " + path + " HTTP/1.1\r\nHost: " + host + "\r\nUser-Agent: curl/7.60.0\r\nAccept: */*\r\n\r\n").encode('utf-8'))
+    return sock
+
+def connect_wlan(timeout = None):
+    wlan = network.WLAN(network.STA_IF)
+    wlan.active(True)
+    if not wlan.isconnected():
+        start = time.ticks_ms()
+        wlan.connect('@BayernWLAN')
+        while wlan.status() != network.STAT_GOT_IP and (not timeout or time.ticks_diff(time.ticks_ms(), start) < timeout):
+            time.sleep_ms(100)
+    return wlan.status()
+
+def login_wlan():
+    s = sock("hotspot.vodafone.de", 443, True)
+    http_get(s, "hotspot.vodafone.de", "/api/v4/login?loginProfile=6")
+    return s
+
+connect_wlan()
+login_wlan().read(32)