AntiGuide: ArduinoEtherCardTcpDump

// Simple demo tcpdump http://anntguide.free.fr

#include <EtherCard.h>


// ethernet interface mac address, must be unique on the LAN
byte mymac[] = { 0,1,2,3,4,5 };


byte Ethernet::buffer[700];
uint32_t timer;
char website[] PROGMEM = "wolpoox;logsm.net" ; //"api.pachube.com";
static int sent=0;
static int biglen;
int ICMP=1;
int TCP=0;

void setup () {
  Serial.begin(9600);
  Serial.println("\n[TcpDump]");

  if (ether.begin(sizeof Ethernet::buffer, mymac,10) == 0) 
    Serial.println( "Failed to access Ethernet controller");
  if (!ether.dhcpSetup())
    Serial.println("DHCP failed");

  ether.printIp("IP:  ", ether.myip);
  ether.printIp("GW:  ", ether.gwip);  
  ether.printIp("DNS: ", ether.dnsip);  
  if (!ether.dnsLookup(website))
    Serial.println("DNS failed");
    
  ether.printIp("SRV: ", ether.hisip);

  prtdump("andiamo",10);
 
}

void prhexa(int base,int nb, char *t){
  for (int iii=0;iii<nb;iii=iii+1) {
      Serial.print((byte) ether.buffer[base+iii]);
      Serial.print(" ");
  }
  Serial.print("<-- ");
  Serial.println(t);
}

void dump (int deb, int fin){
  for (int iii=deb;iii<fin;iii=iii+1) Serial.print ((char)ether.buffer[iii]);
  Serial.println("");
   Serial.println("------------------");
  for (int iii=deb;iii<fin;iii=iii+1) { 
       Serial.print (ether.buffer[iii]);
       Serial.print(" ");
  }
}
void prtdump(char *tt,int tout){
Serial.println("------------------");
Serial.println(tt);
Serial.println("------------------");
  prhexa(0,6,"to mac ");
  prhexa(6,6,"from mac ");
  prhexa(12,2,"ehr type (8) ");
  prhexa(14,1," version ");
  prhexa(15,1," service ");
  prhexa(16,2," big len ");
 biglen=ether.buffer[16]*256+ether.buffer[17];
 Serial.print("           ");  Serial.print(biglen);Serial.println(" decimal ");
  prhexa(18,2," id ");
  prhexa(20,2," flag ");
  prhexa(22,1," ttl ");
  prhexa(23,1," next ");
  if (ether.buffer[23]==1){ ICMP=1;Serial.println("ICMP");}
  if (ether.buffer[23]==1) {TCP=1;Serial.print("TCP");}
  prhexa(24,2," chk ");
  prhexa(26,4," source ip ");
  prhexa(30,4," dest ip ");
  if (ICMP) {
  prhexa(34,1," type 8 ");
  prhexa(35,1," code 0 ");
  prhexa(36,2," chk ");
  prhexa(38,2," id 4019 ");
  prhexa(40,2," seq num ");
  dump (42,biglen);
  }
  if (TCP) {
  prhexa(34,2," source port ");
  prhexa(36,2," dest port ");
  prhexa(38,4," seq num ");
  prhexa(42,4," ack num ");
  prhexa(46,2," hdr len ");
  prhexa(48,2," reserved ");
  dump (50,biglen);
  }
  
  Serial.println("");
Serial.println("------------------");
}

void loop () {
word q=  ether.packetReceive();

if (q>64) {
  prtdump("recu",q);
  }
  
  if (!sent){
sent=1;
Stash::prepare(PSTR("Bonjour"));
   prtdump("envoi",10);
 
   ether.tcpSend();
  }
word resu=  ether.packetLoop(q);
if (resu>0){ Serial.print(resu);
 Serial.println("");}
 }