/* Ping.rex
 *
 * Demonstrates an example of a Ping using RexxSock 0.2
 * with Reginald REXX.
 */

/* Register all REXXSOCK functions */
LIBRARY rexxsock

/* FUNCDEF some needed Windows functions */
DO
   icmp_options = "8u, 8u, 8u, 8u, 32u"
   icmp_echo_reply = "32u, 32u, 32u, 16u, 16u, 32u, 8u, 8u, 8u, 8u, 32u"
   FUNCDEF("IcmpCreateFile", "void", "ICMP")
   FUNCDEF("IcmpCloseHandle", ", void", "ICMP")
   FUNCDEF("IcmpSendEcho", "32u, void, 32u, 32u, 32u, struct ICMP_OPTIONS *, struct ICMP_ECHO_REPLY * stor, 32u, 32u", "ICMP")

   CATCH FAILURE
      CONDITION('M')
END

/* Ask user to enter the host name (ie, microsoft.com) or IP address
 * (199.100.0.1)
 */
SAY "Enter host name (microsoft.com) or IP address (199.100.0.1):"
PULL NAME

/* Assume he entered a host name */
err = SockGetHostByName(NAME, 'server.!')

/* Tell REXXSOCK that we want it to raise USER 10 condition for any
 * error (besides SYNTAX errors of course). We also want SockErrNo
 * set (instead of ErrNo)
 */
SockInit(10, 1)

/* If SockGetHostByName failed, then assume he entered an IP address instead */
IF err == 0 THEN SockGetHostByAddr(NAME, 'server.!')

/* Get the IP address as a single numeric value */
addr = VALUEIN(sockaddrconvert(server.!addr),,4,'V')

/* Get an ICMP echo request handle */
hndlfile = icmpcreatefile()
IF hndlfile \== 0 THEN DO 4

   ipinfo.1 = 255
   ipinfo.2 = 0
   ipinfo.3 = 0
   ipinfo.4 = 0
   ipinfo.5 = 0

   /* Request an ICMP echo */
   icmpsendecho(hndlfile, addr, , , ipinfo, icmpecho, 28, 5000 /* Time to wait in milliseconds */)

   /* Print the results */
   SAY "Reply from" NAME  "Time=" || icmpecho.3 || "ms" "TTL=" || icmpecho.7
   IF icmpecho.2 \== 0 THEN DO
      SAY "Error Status=" icmpecho.2
      SIGNAL done
   END
END
ELSE
   SAY "Can't get an ICMP echo request handle"

done:
IF hndlfile \== 0 THEN icmpclosehandle(hndlfile)

RETURN


/* CATCH USER 10 condition which we are using for REXXSOCK functions
 * when they report errors. We told REXXSOCK to raise the USER 10
 * condition if there is ever any error (other than a SYNTAX error).
 * So we jump here if it is raised. So, if we're here, then some
 * REXXSOCK function has had an error.
 */
CATCH user 10
   SockPSock_Errno()