RealTimeCompLab2
RealtimeCompLab2
Dependencies: mbed
Fork of
PPP-Blinky
by 
Nicolas Nackel
Diff: main.cpp
- Revision:
- 31:e000c1b9c565
- Parent:
- 30:273431bccb02
- Child:
- 32:512228c29209
--- a/main.cpp Thu Jan 05 02:00:04 2017 +0000
+++ b/main.cpp Thu Jan 05 02:16:53 2017 +0000
@@ -50,7 +50,7 @@
int online;
int ident;
int sync;
- int seq;
+ unsigned int seq;
int crc;
int ledState;
struct {
@@ -66,7 +66,7 @@
char * buf;
} pkt; // ppp buffer
};
-
+
pppType ppp; // our global - definitely not thread safe
// intitialize our globals
@@ -100,8 +100,8 @@
int crcBuf(char * buf, int size) // crc on an entire block of memory
{
- crcReset();
- for(int i=0; i<size; i++)crcDo(*buf++);
+ crcReset();
+ for(int i=0; i<size; i++)crcDo(*buf++);
return ppp.crc;
}
@@ -447,8 +447,8 @@
char * seqtcp = tcpStart + 4; // 4 bytes
char * acktcp = tcpStart + 8; // 4 bytes
char * flagbitstcp = tcpStart + 12; // 9 bits
- int seq = (seqtcp[0]<<24)|(seqtcp[1]<<16)|(seqtcp[2]<<8)|(seqtcp[3]);
- int ack = (acktcp[0]<<24)|(acktcp[1]<<16)|(acktcp[2]<<8)|(acktcp[3]);
+ unsigned int seq = (seqtcp[0]<<24)|(seqtcp[1]<<16)|(seqtcp[2]<<8)|(seqtcp[3]);
+ unsigned int ack = (acktcp[0]<<24)|(acktcp[1]<<16)|(acktcp[2]<<8)|(acktcp[3]);
int flags = ((flagbitstcp[0]&1)<<8)|flagbitstcp[1];
char flagInfo[10];
@@ -497,8 +497,8 @@
int tcpHeaderLen = ((offset[0]>>4)&0x0f)*4; // size of tcp header only
int dataLen = tcpSize - tcpHeaderLen; // data is what's left after the header
- int seq = (seqtcp[0]<<24)|(seqtcp[1]<<16)|(seqtcp[2]<<8)|(seqtcp[3]);
- int ack = (acktcp[0]<<24)|(acktcp[1]<<16)|(acktcp[2]<<8)|(acktcp[3]);
+ unsigned int seq = (seqtcp[0]<<24)|(seqtcp[1]<<16)|(seqtcp[2]<<8)|(seqtcp[3]);
+ unsigned int ack = (acktcp[0]<<24)|(acktcp[1]<<16)|(acktcp[2]<<8)|(acktcp[3]);
char * dataStart = s + tcpHeaderLen; // start of data
@@ -535,35 +535,45 @@
ack = seq + 1; // when you see SYN you increment their sequence
seq = ppp.seq-1; // we cheat - our sequence will be one higher hereafter
} else if ( (flagsTCP & TCP_FLAG_PSH) != 0 ) { // they are pushing data
-
- // Ok, we are done with figuring out the flags. Now we start preparing to respond
-
- int temp = ack;
- ack = seq + incomingLen; // acknowledge the number of bytes they sent by adding it to seq
- ppp.seq = temp; // adopt their calculation of our sequence number
- seq = ppp.seq;
- // let's check incoming text for an HTTP home page GET request
- if ( strncmp(dataStart, "GET / HTTP/1.1", 14) == 0) {
- flagbitstcp[1] = TCP_FLAG_FIN; // close connection after delivering page
- dataLen = 15*32; // this block has to hold the web page below, but keep it under 1k
- memset(dataStart,'x', dataLen ); // initialize the block
- int n=0; // number of bytes we have printed so far
- n=n+sprintf(n+dataStart,"HTTP/1.1 200 OK\r\nServer: PPP-Blinky\r\n"); // http header
- n=n+sprintf(n+dataStart,"Content-Length: 378\r\n"); // http header
- n=n+sprintf(n+dataStart,"Content-Type: text/html;charset=us-ascii\r\n\r\n"); // http header
- int nHeader=n; // byte total of all headers
- n=n+sprintf(n+dataStart,"<html><head><title>mbed-PPP-Blinky</title><script>window.onload=function()"); // html
- n=n+sprintf(n+dataStart,"{setInterval(function(){function x(){return document.getElementById('w');};"); // html
- n=n+sprintf(n+dataStart,"x().innerText = parseInt(x().innerText)+1;},100);};</script></head><body>"); // html
- n=n+sprintf(n+dataStart,"<h1>mbed-PPP-Blinky Up and Running</h1><h1 id=\"w\" style=\"text-align:"); // html
- n=n+sprintf(n+dataStart," center\";>0</h1><h1><a href=\"http://bit.ly/pppBlinky\">Source on mbed</h1></body></html>"); // html
- int contentLength = dataLen-nHeader; // this is how to calculate Content-Length, but using curl -v is easier
- contentLength = contentLength+0; // get around unreferenced variable warning
- if (v0) {
- debug(("HTTP GET dataLen %d*32=%d Header %d Content-Length %d Total %d Margin %d\n",dataLen/32,dataLen,nHeader,contentLength,n,dataLen-n-1));
+
+ // Ok, we are done with figuring out the flags. Now we start preparing to respond
+
+ int temp = ack;
+ ack = seq + incomingLen; // acknowledge the number of bytes they sent by adding it to seq
+ ppp.seq = temp; // adopt their calculation of our sequence number
+ seq = ppp.seq;
+
+ // let's check incoming text for an HTTP home page GET request
+ if ( strncmp(dataStart, "GET / HTTP/1.1", 14) == 0) {
+ flagbitstcp[1] = TCP_FLAG_FIN; // close connection after delivering page
+ dataLen = 15*32; // this block has to hold the web page below, but keep it under 1k
+ memset(dataStart,'x', dataLen ); // initialize the block
+ int n=0; // number of bytes we have printed so far
+ n=n+sprintf(n+dataStart,"HTTP/1.1 200 OK\r\nServer: PPP-Blinky\r\n"); // http header
+ n=n+sprintf(n+dataStart,"Content-Length: 378\r\n"); // http header
+ n=n+sprintf(n+dataStart,"Content-Type: text/html;charset=us-ascii\r\n\r\n"); // http header
+ int nHeader=n; // byte total of all headers
+ n=n+sprintf(n+dataStart,"<html><head><title>mbed-PPP-Blinky</title><script>window.onload=function()"); // html
+ n=n+sprintf(n+dataStart,"{setInterval(function(){function x(){return document.getElementById('w');};"); // html
+ n=n+sprintf(n+dataStart,"x().innerText = parseInt(x().innerText)+1;},100);};</script></head><body>"); // html
+ n=n+sprintf(n+dataStart,"<h1>mbed-PPP-Blinky Up and Running</h1><h1 id=\"w\" style=\"text-align:"); // html
+ n=n+sprintf(n+dataStart," center\";>0</h1><h1><a href=\"http://bit.ly/pppBlinky\">Source on mbed</h1></body></html>"); // html
+ int contentLength = dataLen-nHeader; // this is how to calculate Content-Length, but using curl -v is easier
+ contentLength = contentLength+0; // get around unreferenced variable warning
+ if (v0) {
+ debug(("HTTP GET dataLen %d*32=%d Header %d Content-Length %d Total %d Margin %d\n",dataLen/32,dataLen,nHeader,contentLength,n,dataLen-n-1));
+ }
+ } else if ( strncmp(dataStart, "GET /", 4) == 0) {
+ flagbitstcp[1] = TCP_FLAG_FIN; // close connection after delivering page
+ dataLen = 2*32; // this block has to hold the web page below, but keep it under 1k
+ memset(dataStart,'x', dataLen ); // initialize the block
+ int n=0; // number of bytes we have printed so far
+ n=n+sprintf(n+dataStart,"HTTP/1.1 404 Not Found\r\n\r\n\r\n\r\n"); // http header
+ if (v0) {
+ debug(("HTTP 404 Not Found\n"));
+ }
}
}
-}
// now we have to recalculate all the header sizes