Diff: main.cpp

Revision:

0:68a0003c4cb8

Child:

1:3d9c83af7246

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Sep 15 11:17:50 2014 +0000
@@ -0,0 +1,192 @@
+/* In this example LED1 is switched on/off using a web browser connected to this HTTP server.
+ * The example is based on the Tuxgraphics Web Switch <tuxgraphics.org>.
+ * This HTTP server is built around the UIPEthernet library for the ENC28J60 chip <https://github.com/ntruchsess/arduino_uip>
+ * ported to mbed.
+ */
+
+#include <mbed.h>
+#include <UIPEthernet.h>
+#include <UIPServer.h>
+#include <UIPClient.h>
+#include <string>
+
+using namespace std;
+
+// UIPEthernet is the name of a global instance of UIPEthernetClass.
+// Do not change the name! It is used within the UIPEthernet library.
+// Adapt the SPI pin names to your mbed platform/board if not present yet.
+#if defined(TARGET_LPC1768)
+UIPEthernetClass UIPEthernet(p11, p12, p13, p8);        // mosi, miso, sck, cs
+#elif defined(TARGET_LPC1114)
+UIPEthernetClass UIPEthernet(dp2, dp1, dp6, dp25);      // mosi, miso, sck, cs
+#elif defined(TARGET_LPC11U68)
+UIPEthernetClass UIPEthernet(P0_9, P0_8, P1_29, P0_2);  // mosi, miso, sck, cs
+#elif defined (TARGET_NUCLEO_F103RB)
+UIPEthernetClass UIPEthernet(PB_5, PB_4, PB_3, PB_6);   // mosi, miso, sck, cs
+#endif
+
+
+// MAC number must be unique within the connected network. Modify as appropriate.
+const uint8_t    MY_MAC[6] = {0x00,0x01,0x02,0x03,0x04,0x05};
+// IP address must be also unique and compatible with your network. Change as appropriate.
+const IPAddress  MY_IP(192,168,1,181);
+const uint16_t   MY_PORT = 80;      // for HTTP connection
+EthernetServer   myServer = EthernetServer(MY_PORT);
+// In this example we are turning on/off LED1.
+// Change the pin name if you would like to switch on/off something else.
+// However, make sure you avoid SPI pin names used already for UIPEthernet.
+DigitalOut       sw(LED1);
+
+const string PASSWORD     = "secret";   // change as you like
+const string HTTP_OK      = "HTTP/1.0 200 OK";
+const string MOVED_PERM   = "HTTP/1.0 301 Moved Permanently\r\nLocation: ";
+const string UNAUTHORIZED = "HTTP/1.0 401 Unauthorized";
+string       httpHeader;     // HTTP header
+string       httpContent;    // HTTP content
+
+
+// analyse the url given
+// return values: -1 invalid password
+//                -2 no command given but password valid
+//                -3 just refresh page
+//                 0 switch off
+//                 1 switch on
+//
+//                The string passed to this function will look like this:
+//                GET /password HTTP/1.....
+//                GET /password/ HTTP/1.....
+//                GET /password/?sw=1 HTTP/1.....
+//                GET /password/?sw=0 HTTP/1.....
+
+int8_t analyse_get_url(string& str)
+{
+    if(str.substr(5, PASSWORD.size()) != PASSWORD)
+        return(-1);
+
+    uint8_t pos = 5 + PASSWORD.size();
+
+    if(str.substr(pos, 1) == " ")
+        return(-2);
+
+    if(str.substr(pos, 1) != "/")
+        return(-1);
+
+    pos++;
+
+    string cmd(str.substr(pos, 5));
+
+    if(cmd == "?sw=0")
+        return(0);
+
+    if(cmd == "?sw=1")
+        return(1);
+
+    return(-3);
+}
+
+string& moved_perm(uint8_t flag)
+{
+    if(flag == 1)
+        httpContent = "/" +  PASSWORD + "/";
+    else
+        httpContent = "";
+
+    httpContent += "<h1>301 Moved Permanently</h1>\r\n";
+
+    return (httpContent);
+}
+
+string& page(uint8_t status)
+{
+    httpContent = "<h2>Web Switch</h2>\r\n";
+
+    if(status == 1) {
+        httpContent += "<pre>\r\n  <font color=#FF0000>ON</font>";
+        httpContent += " <a href=\"./?sw=0\">[switch off]</a>\r\n";
+    } else {
+        httpContent += "<pre>\r\n  <font color=#00FF00>OFF</font>";
+        httpContent += " <a href=\"./?sw=1\">[switch on]</a>\r\n";
+    }
+
+    httpContent += "  <a href=\".\">[refresh status]</a>\r\n";
+    httpContent += "</pre>\r\n";
+    httpContent += "<hr>\r\n";
+    return httpContent;
+}
+
+void http_send(EthernetClient& client, string& header, string& content)
+{
+    char content_length[5] = {};
+
+    header += "\r\nContent-Type: text\r\n";
+    header += "Content-Length: ";
+    sprintf(content_length, "%d", content.length());
+    header += string(content_length) + "\r\n";
+    header += "Pragma: no-cache\r\n";
+    header += "Connection: About to close\r\n";
+    header += "\r\n";
+    string webpage = header + content;
+    client.write((uint8_t*)webpage.c_str(),webpage.length());
+}
+
+int main()
+{
+    Ethernet.begin(MY_MAC,MY_IP);
+    myServer.begin();
+    while(1) {
+        EthernetClient client = myServer.available();
+        if (client) {
+            size_t size = client.available();
+            if(size > 0) {
+                uint8_t* buf = (uint8_t*)malloc(size);
+                size = client.read(buf, size);
+                string received((char*)buf);
+                free(buf);
+                if(received.substr(0, 3) != "GET") {
+                    // head, post or other method
+                    // for possible status codes see:
+                    // http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
+                    httpHeader = HTTP_OK;
+                    httpContent = "<h1>200 OK</h1>";
+                    http_send(client, httpHeader, httpContent);
+                    continue;
+                }
+
+                if(received.substr(0, 6) == "GET / ") {
+                    httpHeader = HTTP_OK;
+                    httpContent = "<p>Usage: http://host_or_ip/password</p>\r\n";
+                    http_send(client, httpHeader, httpContent);
+                    continue;
+                }
+
+                int cmd = analyse_get_url(received);
+
+                if(cmd == -2) {
+                    // redirect to the right base url
+                    httpHeader = MOVED_PERM;
+                    http_send(client, httpHeader, moved_perm(1));
+                    continue;
+                }
+
+                if(cmd == -1) {
+                    httpHeader = UNAUTHORIZED;
+                    httpContent = "<h1>401 Unauthorized</h1>";
+                    http_send(client, httpHeader, httpContent);
+                    continue;
+                }
+
+                if(cmd == 1) {
+                    sw = 1;     // switch on
+                }
+
+                if(cmd == 0) {
+                    sw = 0;    // switch off
+                }
+
+                httpHeader = HTTP_OK;
+                http_send(client, httpHeader, page(sw));
+            }
+        }
+    }
+}
+