ATENÇÃO - Correção da função de logoff para firefox e IE. (16/06/2015).
quando implementei a função de logoff, não fiz os testes adequadamente no Firefox e no IE e acabou que a função funcionou apenas para o Chrome.
Fiz as devidas correções e agora está funcionando corretamente (pelo menos nos testes que fiz com Firefox e IE)
o código corrigido ficou assim:
void html_logoff(EthernetClient &client){
client.print(F(
"HTTP/1.1 401 Authorization Required\n"
"Content-Type: text/html\n"
"Connnection: close\n\n"
"<!DOCTYPE HTML>\n"
"<html><head><title>Logoff</title>\n"
"<script>document.execCommand('ClearAuthenticationCache', 'false');</script>" //IE logoff
"<script>try {" //mozila logoff
" var agt=navigator.userAgent.toLowerCase();"
" if (agt.indexOf(\"msie\") != -1) { document.execCommand(\"ClearAuthenticationCache\"); }"
" else {"
" var xmlhttp = createXMLObject();"
" xmlhttp.open(\"GET\",\"URL\",true,\"logout\",\"logout\");"
" xmlhttp.send(\"\");"
" xmlhttp.abort();"
" }"
" } catch(e) {"
" alert(\"erro ao fazer logoff\");"
" }"
"function createXMLObject() {"
" try {if (window.XMLHttpRequest) {xmlhttp = new XMLHttpRequest();} else if (window.ActiveXObject) {xmlhttp=new ActiveXObject(\"Microsoft.XMLHTTP\");}} catch (e) {xmlhttp=false;}"
" return xmlhttp;"
"}</script>"
"</head><body><h1>Voce nao esta mais conectado</h1></body></html>\n"));
}
Código completo Corrigido;
/*
Web Server - HTTP Autentication
Baseado na versão de exemplo do Arduino.
ATENÇÃO: esse código é apenas para exemplo e não deve ser encarado como solução
completa para segurança de informações de qualquer aplicação.
modified 25 feb 2015
by Fabiano A. Arndt (fabianoallex)
*/
/*
descrição Original:
Web Server
A simple web server that shows the value of the analog input pins.
using an Arduino Wiznet Ethernet shield.
Circuit:
* Ethernet shield attached to pins 10, 11, 12, 13
* Analog inputs attached to pins A0 through A5 (optional)
created 18 Dec 2009
by David A. Mellis
modified 9 Apr 2012
by Tom Igoe
*/
/**********************************************************************************
************************************BIBLIOTECAS************************************
**********************************************************************************/
#include <SPI.h>
#include <Ethernet.h>
/**********************************************************************************
********************************FIM BIBLIOTECAS************************************
**********************************************************************************/
/**********************************************************************************
*************************ROTINAS USUARIO E SENHA***********************************
***********************************************************************************/
boolean validar_usuario(char * linebuf) {
/*
nesse exemplo o usuario e senha estão definidos dentro do código fonte.
mas o usuário e senha poderiam ser autenticados de diversas maneiras,
lendo os dados de um servidor web, arquivo texto, etc, bastando apenas atribuir
o valor lido para a variável usuario_senha.
*/
char usuario_senha[] = "admin:admin";
int t = strlen(usuario_senha);
int tamanhoEnc = (((t-1) / 3) + 1) * 4; //tamanho da string codificada
char out[tamanhoEnc];
base64_encode(out, usuario_senha, t+1 );
//---desconta é usado pra eliminar os caracteres '='
int desconta = 0;
if ((t%3) == 1) { desconta = 2; }
if ((t%3) == 2) { desconta = 1; }
char out2[tamanhoEnc-desconta];
byte i;
for (i=0; i<(tamanhoEnc-desconta);i++){ out2[i] = out[i]; }
out2[i] = '\0';
return ( strstr(linebuf, out2)>0 );
}
/**********************************************************************************
*************************FIM ROTINA USUARIO E SENHA********************************
***********************************************************************************/
/**********************************************************************************
***********************************PAGINAS HTML************************************
***********************************************************************************/
EthernetServer * server;
void iniciar_ethernet(){
byte ip[4] = {192,168,200,188};
//byte gateway[4] = {192,168,200,254};
//byte subnet[4] = {255,255,255,0};
byte mac[6] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
int porta = 80;
server = new EthernetServer(porta);
//Ethernet.begin(mac, ip, gateway, subnet); //caso necessario gateway utilizar essa linha
Ethernet.begin(mac, ip);
server->begin();
}
void html_logoff(EthernetClient &client){
client.print(F(
"HTTP/1.1 401 Authorization Required\n"
"Content-Type: text/html\n"
"Connnection: close\n\n"
"<!DOCTYPE HTML>\n"
"<html><head><title>Logoff</title>\n"
"<script>document.execCommand('ClearAuthenticationCache', 'false');</script>" //IE logoff
"<script>try {" //mozila logoff
" var agt=navigator.userAgent.toLowerCase();"
" if (agt.indexOf(\"msie\") != -1) { document.execCommand(\"ClearAuthenticationCache\"); }"
" else {"
" var xmlhttp = createXMLObject();"
" xmlhttp.open(\"GET\",\"URL\",true,\"logout\",\"logout\");"
" xmlhttp.send(\"\");"
" xmlhttp.abort();"
" }"
" } catch(e) {"
" alert(\"erro ao fazer logoff\");"
" }"
"function createXMLObject() {"
" try {if (window.XMLHttpRequest) {xmlhttp = new XMLHttpRequest();} else if (window.ActiveXObject) {xmlhttp=new ActiveXObject(\"Microsoft.XMLHTTP\");}} catch (e) {xmlhttp=false;}"
" return xmlhttp;"
"}</script>"
"</head><body><h1>Voce nao esta mais conectado</h1></body></html>\n"));
}
void html_autenticar(EthernetClient &client) {
client.print(F("HTTP/1.1 401 Authorization Required\n"
"WWW-Authenticate: Basic realm=\"Area Restrita\"\n"
"Content-Type: text/html\n"
"Connnection: close\n\n"
"<!DOCTYPE HTML>\n"
"<html><head><title>Error</title>\n"
"</head><body><h1>401 Acesso nao autorizado</h1></body></html>\n"));
}
void html_autenticado(EthernetClient &client){
client.println(F("HTTP/1.1 200 OK\n"
"Content-Type: text/html\n"
"Connection: keep-alive\n\n"
"<!DOCTYPE HTML>"
"<html>"));
for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
int sensorReading = analogRead(analogChannel);
client.print(F("analog input "));
client.print(analogChannel);
client.print(F(" is "));
client.print(sensorReading);
client.println(F("<br>"));
}
client.println(F("<br><a href='/logoff'>Logoff</a></html>"));
}
void exec_ethernet(){
EthernetClient client = server->available();
if (client) {
char linebuf[80];
memset(linebuf, 0, sizeof(linebuf));
int charCount = 0;
boolean autenticado = false;
boolean currentLineIsBlank = true;
boolean logoff = false;
while (client.connected()) {
if (client.available()) {
char c = client.read();
linebuf[charCount] = c;
if (charCount<sizeof(linebuf)-1) { charCount++; }
Serial.write(c);
if (c == '\n' && currentLineIsBlank) {
if (autenticado && !logoff ){
html_autenticado(client);
} else {
logoff ? html_logoff(client) : html_autenticar(client);
}
break;
}
if (c == '\n') {
currentLineIsBlank = true;
if (strstr(linebuf, "GET /logoff" )>0 ) { logoff = true; }
if (strstr(linebuf, "Authorization: Basic")>0 ) { if ( validar_usuario(linebuf) ) { autenticado = true; } }
memset(linebuf, 0, sizeof(linebuf));
charCount = 0;
} else if (c != '\r') {
currentLineIsBlank = false; // you've gotten a character on the current line
}
}
}
delay(1); // give the web browser time to receive the data
client.stop(); // close the connection:
}
}
/**********************************************************************************
**************************************** FIM PAGINAS HTML**************************
***********************************************************************************/
/**********************************************************************************
*************************BASE 64 CODE/DECODE DO USUARIO E SENHA********************
***********************************************************************************/
void a3_to_a4(unsigned char * a4, unsigned char * a3);
void a4_to_a3(unsigned char * a3, unsigned char * a4);
unsigned char b64_lookup(char c);
int base64_encode(char *output, char *input, int inputLen) {
const char b64_alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int i=0, j=0, encLen=0;
unsigned char a3[3], a4[4];
while(inputLen--) {
a3[i++] = *(input++);
if(i == 3) {
a3_to_a4(a4, a3);
for(i=0; i<4; i++) { output[encLen++] = b64_alphabet[a4[i]]; }
i = 0;
}
}
if (i) {
for(j = i; j < 3; j++) { a3[j] = '\0'; }
a3_to_a4(a4, a3);
for(j = 0; j < i + 1; j++) { output[encLen++] = b64_alphabet[a4[j]]; }
while((i++ < 3)) { output[encLen++] = '='; }
}
output[encLen] = '\0';
return encLen;
}
/*
int base64_decode(char * output, char * input, int inputLen) {
int i = 0, j = 0;
int decLen = 0;
unsigned char a3[3];
unsigned char a4[4];
while (inputLen--) {
if (*input == '=') { break; }
a4[i++] = *(input++);
if (i == 4) {
for (i = 0; i <4; i++) { a4[i] = b64_lookup(a4[i]); }
a4_to_a3(a3,a4);
for (i = 0; i < 3; i++) { output[decLen++] = a3[i]; }
i = 0;
}
}
if (i) {
for (j=i; j<4; j++) { a4[j] = '\0'; }
for (j=0; j<4; j++) { a4[j] = b64_lookup(a4[j]);}
a4_to_a3(a3,a4);
for (j=0; j<i-1; j++) { output[decLen++] = a3[j]; }
}
output[decLen] = '\0';
return decLen;
}
*/
//int base64_enc_len(int plainLen) {
// int n = plainLen;
// return (n + 2 - ((n + 2) % 3)) / 3 * 4;
//}
//int base64_dec_len(char * input, int inputLen) {
// int i = 0;
// int numEq = 0;
// for(i = inputLen - 1; input[i] == '='; i--) { numEq++; }
// return ((6 * inputLen) / 8) - numEq;
//}
void a3_to_a4(unsigned char * a4, unsigned char * a3) {
a4[0] = (a3[0] & 0xfc) >> 2;
a4[1] = ((a3[0] & 0x03) << 4) + ((a3[1] & 0xf0) >> 4);
a4[2] = ((a3[1] & 0x0f) << 2) + ((a3[2] & 0xc0) >> 6);
a4[3] = (a3[2] & 0x3f);
}
//void a4_to_a3(unsigned char * a3, unsigned char * a4) {
// a3[0] = (a4[0] << 2) + ((a4[1] & 0x30) >> 4);
// a3[1] = ((a4[1] & 0xf) << 4) + ((a4[2] & 0x3c) >> 2);
// a3[2] = ((a4[2] & 0x3) << 6) + a4[3];
//}
unsigned char b64_lookup(char c) {
if(c >='A' && c <='Z') return c - 'A';
if(c >='a' && c <='z') return c - 71;
if(c >='0' && c <='9') return c + 4;
if(c == '+') return 62;
if(c == '/') return 63;
return -1;
}
/**********************************************************************************
*************************FIM BASE 64 CODE/DECODE DO USUARIO E SENHA****************
***********************************************************************************/
/**********************************************************************************
**************************************** VOID / LOOP ******************************
***********************************************************************************/
void setup() {
Serial.begin(9600);
iniciar_ethernet();
}
void loop() {
exec_ethernet();
}
/**********************************************************************************
*************************************FIM VOID / LOOP*******************************
***********************************************************************************/
