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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
int happy = 0;
int valid_fn (unsigned char fn)
{
switch (fn) {
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
case 0x38:
case 0x08:
case 0x39:
case 0x09:
case 0x43:
case 0x45:
case 0x4E:
case 0x4F:
case 0x50:
case 0x40:
case 0x3F:
case 0x23:
case 0x26:
case 0x41:
case 0x58:
case 0x4C:
case 0x56:
case 0x76:
case 0x49:
return 1;
}
return 0;
}
int ackable (unsigned char fn)
{
switch (fn) {
case 0x09:
case 0x39:
case 0x08:
case 0x38:
case 0x40:
case 0x43:
case 0x58:
return 0;
}
return 1;
}
void ack (int fd)
{
char buf[3];
buf[0] = 0;
buf[1] = 0x38;
buf[2] = 0xff ^ buf[0] ^ buf[1];
write (fd, buf, sizeof (buf));
}
int rx_pkt (int fd, unsigned char *pkt, unsigned len)
{
unsigned char parity = 0xff;
unsigned i;
for (i = 0; i < len; ++i)
parity ^= pkt[i];
if (parity) return -1;
happy++;
for (i = 2; i < len - 1; ++i) {
if ((pkt[i] > 31) && (pkt[i] < 127))
putchar (pkt[i]);
else
printf ("\\x%02x", pkt[i]);
}
printf ("\n");
if ((pkt[0] & 0x40) && ackable (pkt[1])) ack (fd);
return 0;
}
int rx (int fd)
{
static unsigned char pkt[67];
static unsigned ptr;
unsigned char byte;
unsigned len;
if (read (fd, &byte, 1) != 1) {
ptr = 0;
return -1;
}
pkt[ptr++] = byte;
if (ptr > 2 && !valid_fn (pkt[1])) {
ptr = 0;
return 0;
}
len = pkt[0] & 0x3f;
if (ptr == (len + 3)) {
ptr = 0;
return rx_pkt (fd, pkt, len + 3);
}
return 0;
}
int transact (int fd, int ack, unsigned char fn, void *data, unsigned len, int timeout)
{
struct timeval tv = {0};
int rc;
fd_set rfds;
unsigned char buf[67], parity;
unsigned i;
happy = 0;
tv.tv_sec = timeout;
buf[0] = len;
if (ack) buf[0] |= 0x40;
buf[1] = fn;
memcpy (&buf[2], data, len);
parity = 0xff;
for (i = 0; i < (len + 2); ++i)
parity ^= buf[i];
buf[i] = parity;
i++;
write (fd, buf, i);
fwrite (data, 1, len, stdout);
printf (" => ");
fflush (stdout);
while (!happy) {
FD_ZERO (&rfds);
FD_SET (fd, &rfds);
rc = select (fd + 1, &rfds, NULL, NULL, &tv);
if (!rc) break;
rx (fd);
}
return happy;
}
int main (int argc, char *argv[])
{
struct sockaddr_in sin;
int fd;
unsigned char buf[128];
fd = socket (PF_INET, SOCK_STREAM, 0);
sin.sin_family = AF_INET;
sin.sin_port = htons (10005);
inet_aton ("10.32.52.66", &sin.sin_addr);
connect (fd, (struct sockaddr *)&sin, sizeof (sin));
transact (fd, 1, 0x3f, "543210", 6, 4);
transact (fd, 1, 0x43, "SA", 2, 4);
transact (fd, 1, 0x3f, "543210", 6, 4);
transact (fd, 1, 0x43, "SA91", 4, 4);
transact (fd, 1, 0x3f, "543210", 6, 4);
transact (fd, 1, 0x43, "SA92", 4, 4);
if (argc == 2) {
sprintf (buf, "SA1*%s", argv[1]);
transact (fd, 1, 0x3f, "543210", 6, 4);
transact (fd, 1, 0x43, buf, strlen (buf), 4);
}
close (fd);
}
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