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22. Appendix B - Serial Infrared Port Sniffers
22.1 Sniffer by Gerd KnorrThis programm is a courtesy by Gerd Knorr. You may use it to sniff the traffic which is going trough your IrDA port for details of the protocol (change the default ttyS1 in the source if necessary):
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <termios.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#define BUFSIZE 1024
int
read_and_print(int fd, int sec, int usec)
{
int rc,l,i;
char buf[BUFSIZE+1];
fd_set set;
struct timeval tv;
if (sec || usec) {
FD_ZERO(&set);
FD_SET(fd,&set);
tv.tv_sec = sec;
tv.tv_usec = usec;
if (0 == select(fd+1,&set,NULL,NULL,&tv))
return -1;
}
switch (rc = read(fd,buf,BUFSIZE)) {
case 0:
printf("EOF");
exit(0);
break;
case -1:
perror("read");
exit(1);
default:
for (l = 0; l < rc; l+= 16) {
printf("%04x ",l);
for (i = l; i < l+16; i++) {
if (i < rc)
printf("%02x ",buf[i]);
else
printf("-- ");
if ((i%4) == 3)
printf(" ");
}
for (i = l; i < l+16; i++) {
if (i < rc)
printf("%c",isalnum(buf[i]) ? buf[i] : '.');
}
printf("\n");
}
break;
}
return rc;
}
void
setlines(int fd, int rts, int dtr)
{
int lines = 0;
if (rts) lines |= TIOCM_RTS;
if (dtr) lines |= TIOCM_DTR;
ioctl(fd,TIOCMSET,&lines);
}
int main(int argc, char *argv[])
{
int ser,i;
struct termios saved_attributes,tattr;
struct winsize win;
char buf[16];
if (-1 == (ser = open("/dev/ttyS1",O_RDWR))) {
perror("open /dev/ttyS1");
exit(1);
}
/* Set the terminal mode */
tcgetattr (ser, &tattr);
cfmakeraw (&tattr);
cfsetospeed (&tattr,B9600);
cfsetispeed (&tattr,B9600);
tcsetattr (ser, 0, &tattr);
setlines(ser,0,0);
#if 0
tcsendbreak(ser,0);
#endif
/* main loop */
fprintf(stderr,"setup done\n");
while (-1 != read_and_print(ser,30,0)) {
usleep(100000);
}
return 0;
}
22.2 sersniffWritten by Jonathan McDowell sersniff is a simple program to tunnel/sniff between 2 serial ports. The program was written to aid with the decoding of the protocol used by the Nokia 9000i Communicator to talk to the NServer software Nokia provides, which only runs under Windows.
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