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############################################################################
#
# File: tnet.icn
#
# Subject: Program to talk to telnet port
#
# Author: Gregg M. Townsend
#
# Date: August 4, 2000
#
############################################################################
#
# Usage: tnet hostname portnumber
#
# This is a VERY simple telnet client. It connects to a remote port
# and exchanges data between the port and the terminal. The port is
# read and echoed to the terminal until the port is quiet for 200 msec;
# then one line from the terminal is sent to the port. This process
# repeats until an EOF is read from either source.
#
# Some interesting port numbers can usually be found in /etc/services.
# For example, network news is read from a news server using port 119.
#
# This program does not work under Irix because poll(2) always returns 1.
#
############################################################################
link cfunc # link standard C functions transparently
procedure main(args)
local h, p, f, s
h := args[1] | &host # default is current host
p := integer(args[2]) | 13 # default is port 13 (time of day)
f := tconnect(h, p) | stop("can't connect to port ", p, " of ", h)
fpoll(f, 2000) # wait up to 2 sec for initial response
repeat {
while fpoll(f, 200) do # read characters from port until timeout
writes(reads(f)) | { write("EOF"); break break }
writes("\n> ") # issue prompt
s := read() | break # read line from terminal
seek(f) # enable switch from input to output
flush(f) # workaround for Dec Alpha bug
write(f, s) # write terminal input to port
seek(f) # enable switch from output to input
}
end
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