// Perform all processing to resolve a hostname to IP address.
// Returns 1 for successful Name resolution, 0 otherwise
uint8_t EtherShield::resolveHostname(uint8_t *buf, uint16_t buffer_size, uint8_t *hostname ) {
uint16_t dat_p;
int plen = 0;
long lastDnsRequest = millis();
uint8_t dns_state = DNS_STATE_INIT;
boolean gotAddress = false;
uint8_t dnsTries = 3; // After 10 attempts fail gracefully so other action can be carried out
while( !gotAddress ) {
// handle ping and wait for a tcp packet
plen = enc28j60PacketReceive(buffer_size, buf);
dat_p=packetloop_icmp_tcp(buf,plen);
// We have a packet
// Check if IP data
if (dat_p == 0) {
if (client_waiting_gw() ) {
// No ARP received for gateway
continue;
}
// It has IP data
if (dns_state==DNS_STATE_INIT) {
dns_state=DNS_STATE_REQUESTED;
lastDnsRequest = millis();
dnslkup_request(buf,hostname);
continue;
}
if (dns_state!=DNS_STATE_ANSWER){
// retry every minute if dns-lookup failed:
if (millis() > (lastDnsRequest + 60000L) ){
if( --dnsTries <= 0 )
return 0; // Failed to allocate address
dns_state=DNS_STATE_INIT;
lastDnsRequest = millis();
}
// don't try to use client before
// we have a result of dns-lookup
continue;
}
}
else {
if (dns_state==DNS_STATE_REQUESTED && udp_client_check_for_dns_answer( buf, plen ) ){
dns_state=DNS_STATE_ANSWER;
//client_set_wwwip(dnslkup_getip());
client_tcp_set_serverip(dnslkup_getip());
gotAddress = true;
}
}
}
return 1;
}
// prepare the webpage by writing the data to the tcp send buffer
uint16_t print_webpage(uint8_t *buf)
{
uint16_t plen;
char vstr[15];
plen=http200ok();
plen=fill_tcp_data_p(buf,plen,PSTR("<a href=/>[refresh]</a>"));
plen=fill_tcp_data_p(buf,plen,PSTR("<h2>identi.ca notification status</h2>\n<pre>\n"));
if (client_waiting_gw()){
plen=fill_tcp_data_p(buf,plen,PSTR("waiting for GW IP to answer arp.\n"));
return(plen);
}
if (dns_state==1){
plen=fill_tcp_data_p(buf,plen,PSTR("waiting for DNS answer.\n"));
return(plen);
}
/* // debug
plen=fill_tcp_data_p(buf,plen,PSTR("\nweb IP:\n"));
mk_net_str(vstr, dnslkup_getip() ,4,'.',10);
plen=fill_tcp_data(buf,plen,vstr);
plen=fill_tcp_data_p(buf,plen,PSTR("\n"));
*/
plen=fill_tcp_data_p(buf,plen,PSTR("Num of PD6 to GND connections: "));
// convert number to string:
itoa(contact_onoff_cnt,vstr,10);
plen=fill_tcp_data(buf,plen,vstr);
plen=fill_tcp_data_p(buf,plen,PSTR("\nNum of identi.ca attempts: "));
// convert number to string:
itoa(web_client_attempts,vstr,10);
plen=fill_tcp_data(buf,plen,vstr);
plen=fill_tcp_data_p(buf,plen,PSTR("\nNum successful identi.ca: "));
// convert number to string:
itoa(web_client_sendok,vstr,10);
plen=fill_tcp_data(buf,plen,vstr);
plen=fill_tcp_data_p(buf,plen,PSTR("\nDate of last identi.ca: "));
plen=fill_tcp_data(buf,plen,datebuf);
plen=fill_tcp_data_p(buf,plen,PSTR("\nTwitter notify is: "));
if (start_web_client==4){
plen=fill_tcp_data_p(buf,plen,PSTR("OFF"));
}else{
plen=fill_tcp_data_p(buf,plen,PSTR("ON"));
}
plen=fill_tcp_data_p(buf,plen,PSTR("\n<form action=/ method=get>\npassw: <input type=password size=8 name=pw><input type=hidden name=mn "));
if (start_web_client==4){
plen=fill_tcp_data_p(buf,plen,PSTR("value=1><input type=submit value=\"enable identi.ca msg\">"));
}else{
plen=fill_tcp_data_p(buf,plen,PSTR("value=0><input type=submit value=\"disable identi.ca msg\">"));
}
plen=fill_tcp_data_p(buf,plen,PSTR("</form>\n</pre><br><hr>tuxgraphics.org"));
return(plen);
}
int main(void){
uint16_t dat_p,plen;
int8_t cmd;
// Set the clock speed to "no pre-scaler" (8MHz with internal osc or
// full external speed)
// set the clock prescaler. First write CLKPCE to enable setting
// of clock the next four instructions.
// Note that the CKDIV8 Fuse determines the initial
// value of the CKKPS bits.
CLKPR=(1<<CLKPCE); // change enable
CLKPR=0; // "no pre-scaler"
_delay_loop_1(0); // 60us
/*initialize enc28j60*/
enc28j60Init(mymac);
enc28j60clkout(2); // change clkout from 6.25MHz to 12.5MHz
_delay_loop_1(0); // 60us
/* Magjack leds configuration, see enc28j60 datasheet, page 11 */
// LEDB=yellow LEDA=green
//
// 0x476 is PHLCON LEDA=links status, LEDB=receive/transmit
// enc28j60PhyWrite(PHLCON,0b0000 0100 0111 01 10);
enc28j60PhyWrite(PHLCON,0x476);
DDRB|= (1<<DDB1); // LED, enable PB1, LED as output
LEDOFF;
DDRD&= ~(1<<DDD6); // enable PB6, as input
PORTD|= (1<<PIND6); // internal pullup resistor on
init_cnt2();
sei();
//init the web server ethernet/ip layer:
init_ip_arp_udp_tcp(mymac,myip,MYWWWPORT);
// init the web client:
client_set_gwip(gwip); // e.g internal IP of dsl router
//
while(1){
// handle ping and wait for a tcp packet
plen=enc28j60PacketReceive(BUFFER_SIZE, buf);
dat_p=packetloop_icmp_tcp(buf,plen);
if(plen==0){
// we are idle here
if (client_waiting_gw() ){
continue;
}
if (dns_state==0){
sec=0;
dns_state=1;
dnslkup_request(buf,PSTR(WEBSERVER_VHOST));
continue;
}
if (dns_state==1 && dnslkup_haveanswer()){
dns_state=2;
client_set_wwwip(dnslkup_getip());
}
if (dns_state!=2){
// retry every minute if dns-lookup failed:
if (sec > 60){
dns_state=0;
}
// don't try to use web client before
// we have a result of dns-lookup
continue;
}
//----------
if (start_web_client==1){
LEDON;
start_web_client=2;
sec=0;
web_client_attempts++;
// the identi.ca line is status=Url_encoded_string
strcat(statusstr,"status=");
// the text to send to identi.ca (append after status=):
//urlencode("Meals are ready",&(statusstr[7]));
urlencode("I like tuxgraphics eth boards, ",&(statusstr[7]));
// append a number:
itoa(web_client_attempts,&(statusstr[strlen(statusstr)]),10);
// The BLOGGACCOUNT Authorization code can be generated from
// username and password of your identi.ca account
// by using this encoder: http://tuxgraphics.org/~guido/javascript/base64-javascript.html
client_http_post(PSTR("/api/statuses/update.xml"),PSTR(WEBSERVER_VHOST),PSTR(BLOGGACCOUNT),statusstr,&browserresult_callback);
}
// count how often the switch was triggered at all:
if (contact_debounce==0 && bit_is_clear(PIND,PIND6)){
contact_onoff_cnt++;
contact_debounce=1;
}
// we send only a request if we are in the right state (do
// not flood with request):
if (start_web_client==0 && bit_is_clear(PIND,PIND6)){
resend=1; // resend once if it failed
start_web_client=1;
}
// Reset after a delay of 3 min to prevent email sending.
// We reset only if the contact on PD6 was released.
if (start_web_client<=3 && sec==180 && !bit_is_clear(PIND,PIND6)){
start_web_client=0;
}
// Resend the message if it failed:
if (start_web_client==2 && sec==7 && resend){
start_web_client=1;
resend--;
}
continue;
}
if(dat_p==0){ // plen!=0
// check for incomming messages not processed
// as part of packetloop_icmp_tcp, e.g udp messages
udp_client_check_for_dns_answer(buf,plen);
continue;
}
if (strncmp("GET ",(char *)&(buf[dat_p]),4)!=0){
// head, post and other methods:
//
// for possible status codes see:
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
dat_p=http200ok();
dat_p=fill_tcp_data_p(buf,dat_p,PSTR("<h1>200 OK</h1>"));
goto SENDTCP;
}
cmd=analyse_get_url((char *)&(buf[dat_p+4]));
// for possible status codes see:
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
if (cmd==-1){
dat_p=fill_tcp_data_p(buf,0,PSTR("HTTP/1.0 401 Unauthorized\r\nContent-Type: text/html\r\n\r\n<h1>401 Unauthorized</h1>"));
goto SENDTCP;
}
if (cmd==1 && start_web_client==4){
// email was off, switch on
start_web_client=0;
}
if (cmd==0 ){
start_web_client=4; // email off
}
dat_p=http200ok();
dat_p=print_webpage(buf);
//
SENDTCP:
www_server_reply(buf,dat_p); // send data
}
return (0);
}
uint8_t EtherShield::ES_client_waiting_gw() {
return( client_waiting_gw() );
}
