t_stat udp_create (DEVICE *dptr, char *premote, int32 *pln)
{
// Create a logical UDP link to the specified remote system. The "remote"
// string specifies both the remote host name or IP and a port number. The
// port number is both the port we send datagrams to, and also the port we
// listen on for incoming datagrams. UDP doesn't have any real concept of a
// "connection" of course, and this routine simply creates the necessary
// sockets in this host. We have no way of knowing whether the remote host is
// listening or even if it exists.
//
// We return SCPE_OK if we're successful and an error code if we aren't. If
// we are successful, then the ln parameter is assigned the link number,
// which is a handle used to identify this connection to all future udp_xyz()
// calls.
t_stat ret;
int32 link = udp_find_free_link();
if (link < 0) return SCPE_MEM;
// Make sure WINSOCK is initialized ...
if ((ret = udp_startup(dptr)) != SCPE_OK) return ret;
// Parse the remote name and set up the ipaddr and port ...
if ((ret = udp_parse_remote(link, premote)) != SCPE_OK) return ret;
// Create the sockets for the transmitter and receiver ...
if ((ret = udp_create_rx_socket(link)) != SCPE_OK) return ret;
if ((ret = udp_create_tx_socket(link)) != SCPE_OK) return ret;
// All done - mark the TCP_LINK data as "used" and return the index.
udp_links[link].used = TRUE; *pln = link;
sim_debug(IMP_DBG_UDP, dptr, "link %d - listening on port %d and sending to %s\n", link, udp_links[link].rxport, udp_format_remote(link));
return SCPE_OK;
}
int udp_create (char * premote, int * pln)
{
int rc;
// Create a logical UDP link to the specified remote system. The "remote"
// string specifies both the remote host name or IP and a port number. The
// port number is both the port we send datagrams to, and also the port we
// listen on for incoming datagrams. UDP doesn't have any real concept of a
// "connection" of course, and this routine simply creates the necessary
// sockets in this host. We have no way of knowing whether the remote host is
// listening or even if it exists.
//
// We return SCPE_OK if we're successful and an error code if we aren't. If
// we are successful, then the ln parameter is assigned the link number,
// which is a handle used to identify this connection to all future udp_xyz()
// calls.
int link = udp_find_free_link ();
if (link < 0)
return -1; // out of links
// Parse the remote name and set up the ipaddr and port ...
if (udp_parse_remote (link, premote) != 0)
return -2;
#if 0
// Create the socket connection to the destination ...
sprintf(linkinfo, "Buffer=%d,Line=%d,%s,UDP,Connect=%s", (int)(sizeof(UDP_PACKET)+sizeof(int32_t)), link, udp_links[link].lport, udp_links[link].rhostport);
ret = tmxr_open_master (&udp_tmxr, linkinfo);
if (ret != SCPE_OK) return ret;
#endif
int sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sock == -1)
return -3;
rc = fcntl (sock, F_SETFL, fcntl (sock, F_GETFL, 0) | O_NONBLOCK);
if (sock == -1)
return -4;
struct sockaddr_in si_me;
memset ((char *) & si_me, 0, sizeof (si_me));
si_me . sin_family = AF_INET;
si_me . sin_port = udp_links [link] . lportno;
si_me . sin_addr . s_addr = INADDR_ANY;
rc = bind (sock, (struct sockaddr *) & si_me, sizeof (si_me));
if (rc == -1)
return -5;
// As I understand it, a connect on UDP sets the send address and limits
// recieving to the specifed address; creating a 'connection'; I am not
// sure the udplib wants that. The alternative is to use sendto().
struct addrinfo * ai;
rc = getaddrinfo (udp_links [link] . rhost, udp_links [link] . rport, NULL,
& ai);
if (rc == -1)
return -6;
rc = connect (sock, ai -> ai_addr, sizeof (struct sockaddr));
if (rc == -1)
return -7;
freeaddrinfo (ai);
udp_links [link] . sock = sock;
// All done - mark the TCP_LINK data as "used" and return the index.
udp_links [link] . used = true;
* pln = link;
printf ("link %d - listening on port %s and sending to %s:%s\n", link, udp_links [link] . lport, udp_links [link] . rhost, udp_links [link] . rport);
return 0;
}
