first commit

sketch_aug22a.ino

@@ -0,0 +1,113 @@
+#include <Ethernet.h>
+#include "MD5.h"
+
+EthernetServer server(80);
+
+void setup(void) {
+  pinMode(4, OUTPUT);
+  digitalWrite(4, HIGH);
+  Ethernet.init(10);
+
+  byte mac[] = { 0xA8, 0x61, 0x0A, 0xAE, 0x6F, 0x4A };
+  while (Ethernet.begin(mac) == 0) {
+    delay(1000);
+  }
+
+  server.begin();
+}
+
+
+void loop() {
+  EthernetClient client = server.accept();
+
+  if (client) {
+    byte cmd = client.read();
+    switch (cmd) {
+      case 1:
+        {
+          sendSMS(client);
+          break;
+        }
+    }
+    client.stop();
+  }
+  delay(15);
+}
+
+char* readWithSize(EthernetClient client, byte size) {
+  while (client.available() == 0) {
+    delay(250);
+  }
+
+  char* result = (char*) malloc(sizeof(char) * size+1);
+  for (int i = 0; i < size; i++) {
+    result[i] = client.read();
+  }
+  result[size] = '\0';
+  return result;
+}
+
+char* readStringUntil(EthernetClient client, char c) {
+  while (client.available() == 0) {
+    delay(250);
+  }
+
+  char last = '\0';
+  const byte size = 140;
+  char* result = (char*) malloc(sizeof(char) * size);
+  for (byte i = 0; i < size; i++) {
+    result[i] = ' ';
+  }
+  result[size] = '\0';
+  byte i = 0;
+  while (last != c && i < size) {
+    last = client.read();
+    if (last != c) {
+      result[i] = last;
+      i++;
+    }
+  }
+  result[i] = '\0';
+  return result;
+}
+
+void sendSMS(EthernetClient client) {
+  // get all from client
+  char* phone = readWithSize(client, 10);
+  char* hash = readWithSize(client, 32);
+  char* msg = readStringUntil(client, 1);
+
+  // Check hash
+  unsigned char* h = MD5::make_hash(msg);
+  char* md5str = MD5::make_digest(h, 16);
+
+  if (strcmp(md5str, hash) != 0) {
+    // do something
+    write(client, "error: corrupted message: hash not matching");
+    free(md5str);
+    free(h);
+    free(msg);
+    free(hash);
+    free(phone);
+    return;
+  }
+  free(md5str);
+  free(h);
+  free(hash);
+
+  // do the sms thing
+
+  // Clean all
+  free(msg);
+  free(phone);
+  write(client, "done");
+}
+
+void write(EthernetClient client, char* payload) {
+  while (!client.availableForWrite()) {
+    delay(250);
+  }
+
+  client.print(payload);
+  client.flush();
+}