Rolf Meyer
A simple Ethernet sniffer. A demonstration how to use the Ethernet interface.
main.cpp@0:29e2df9de9f1, 2009-09-04 (annotated)
- Committer:
- rolf
- Date:
- Fri Sep 04 12:24:03 2009 +0000
- Revision:
- 0:29e2df9de9f1
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| rolf | 0:29e2df9de9f1 | 1 | #include "mbed.h" |
| rolf | 0:29e2df9de9f1 | 2 | #include "Ethernet.h" |
| rolf | 0:29e2df9de9f1 | 3 | #include "hexview.h" |
| rolf | 0:29e2df9de9f1 | 4 | |
| rolf | 0:29e2df9de9f1 | 5 | using namespace mbed; |
| rolf | 0:29e2df9de9f1 | 6 | |
| rolf | 0:29e2df9de9f1 | 7 | DigitalOut led4(LED4); |
| rolf | 0:29e2df9de9f1 | 8 | |
| rolf | 0:29e2df9de9f1 | 9 | Ethernet eth; |
| rolf | 0:29e2df9de9f1 | 10 | |
| rolf | 0:29e2df9de9f1 | 11 | /* |
| rolf | 0:29e2df9de9f1 | 12 | __packed struct eth { |
| rolf | 0:29e2df9de9f1 | 13 | unsigned char dst[6]; |
| rolf | 0:29e2df9de9f1 | 14 | unsigned char src[6]; |
| rolf | 0:29e2df9de9f1 | 15 | unsigned short type; |
| rolf | 0:29e2df9de9f1 | 16 | }; |
| rolf | 0:29e2df9de9f1 | 17 | |
| rolf | 0:29e2df9de9f1 | 18 | void show(char *buffer, int size) { |
| rolf | 0:29e2df9de9f1 | 19 | eth *e = (eth *)buffer; |
| rolf | 0:29e2df9de9f1 | 20 | printf("Destination: %02hx:%02hx:%02hx:%02hx:%02hx:%02hx\n", |
| rolf | 0:29e2df9de9f1 | 21 | e->dst[0], e->dst[1], e->dst[2], e->dst[3], e->dst[4], e->dst[5]); |
| rolf | 0:29e2df9de9f1 | 22 | printf("Source: %02hx:%02hx:%02hx:%02hx:%02hx:%02hx\n", |
| rolf | 0:29e2df9de9f1 | 23 | e->src[0], e->src[1], e->src[2], e->src[3], e->src[4], e->src[5]); |
| rolf | 0:29e2df9de9f1 | 24 | |
| rolf | 0:29e2df9de9f1 | 25 | printf("Type %hd\n", eth->type); |
| rolf | 0:29e2df9de9f1 | 26 | hexview(buffer, size); |
| rolf | 0:29e2df9de9f1 | 27 | } |
| rolf | 0:29e2df9de9f1 | 28 | */ |
| rolf | 0:29e2df9de9f1 | 29 | |
| rolf | 0:29e2df9de9f1 | 30 | unsigned short htons(unsigned short n) { // Host short to network shor |
| rolf | 0:29e2df9de9f1 | 31 | return ((n & 0xff) << 8) | ((n & 0xff00) >> 8); // Byte swapping |
| rolf | 0:29e2df9de9f1 | 32 | } |
| rolf | 0:29e2df9de9f1 | 33 | |
| rolf | 0:29e2df9de9f1 | 34 | void show(char *buf, int size) { |
| rolf | 0:29e2df9de9f1 | 35 | printf("Destination: %02hx:%02hx:%02hx:%02hx:%02hx:%02hx\n", |
| rolf | 0:29e2df9de9f1 | 36 | buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]); |
| rolf | 0:29e2df9de9f1 | 37 | printf("Source: %02hx:%02hx:%02hx:%02hx:%02hx:%02hx\n", |
| rolf | 0:29e2df9de9f1 | 38 | buf[6], buf[7], buf[8], buf[9], buf[10], buf[11]); |
| rolf | 0:29e2df9de9f1 | 39 | |
| rolf | 0:29e2df9de9f1 | 40 | printf("Type %hd\n", htons((short)buf[12])); |
| rolf | 0:29e2df9de9f1 | 41 | |
| rolf | 0:29e2df9de9f1 | 42 | hexview(buf, size); |
| rolf | 0:29e2df9de9f1 | 43 | } |
| rolf | 0:29e2df9de9f1 | 44 | |
| rolf | 0:29e2df9de9f1 | 45 | |
| rolf | 0:29e2df9de9f1 | 46 | int main() { |
| rolf | 0:29e2df9de9f1 | 47 | char buffer[0x600]; |
| rolf | 0:29e2df9de9f1 | 48 | int size = 0; |
| rolf | 0:29e2df9de9f1 | 49 | |
| rolf | 0:29e2df9de9f1 | 50 | while(1) { |
| rolf | 0:29e2df9de9f1 | 51 | if((size = eth.receive()) != 0) { |
| rolf | 0:29e2df9de9f1 | 52 | eth.read(buffer, size); |
| rolf | 0:29e2df9de9f1 | 53 | show(buffer, size); |
| rolf | 0:29e2df9de9f1 | 54 | } |
| rolf | 0:29e2df9de9f1 | 55 | |
| rolf | 0:29e2df9de9f1 | 56 | led4 = 1; |
| rolf | 0:29e2df9de9f1 | 57 | wait(0.2); |
| rolf | 0:29e2df9de9f1 | 58 | led4 = 0; |
| rolf | 0:29e2df9de9f1 | 59 | wait(0.2); |
| rolf | 0:29e2df9de9f1 | 60 | } |
| rolf | 0:29e2df9de9f1 | 61 | } |