set TEST_NAME_BASE "ipaddr"
if {![installtest_p]} { untested $TEST_NAME_BASE; return }

# nc server management variables
set IPV4_ONLY -1
set nc_pipe 0

# Start an 'nc' server.  To start an IPv4 server, pass 1 as the
# argument.  To start an IPv6 server, pass 0 as the argument.
proc start_nc_server { IPV4 } {
    global TEST_NAME IPV4_ONLY nc_pipe
    if {$IPV4_ONLY < 0} {
	# First, does 'nc' exist on this system?
	if {[catch { exec which nc } res]} {
	    fail "$TEST_NAME find 'nc'"
	    return -1
	}
	pass "$TEST_NAME find 'nc'"

	# Older versions of 'nc' (on RHEL4 for instance) don't support
	# IPv6. Does this 'nc' support IPv6?
	set IPV4_ONLY 0
	if {[catch { exec sh -c "nc -h 2>&1 | grep -qi IPv6" } res]} {
	    # If we're here, 'nc' doesn't support IPv6.  So, it
	    # supports IPv4 only.
	    set IPV4_ONLY 1
	}
    }

    # Figure out the 'nc' command line.
    if {$IPV4} {
	if {$IPV4_ONLY} {
	    set nc_cmd "| nc -l localhost -p 8079"
	} else {
	    set nc_cmd "| nc -l -4 localhost 8079"
	}
    } else {
	if {$IPV4_ONLY} {
	    untested "$TEST_NAME starting IPv6 nc server"
	    return -1
	}
	set nc_cmd "| nc -l -6 localhost6 8079"
    }

    # Actually start the 'nc' server.
    verbose -log "starting $nc_cmd"
    if {[catch {open $nc_cmd} nc_pipe]} {
	verbose -log "nc command failed: $fl"
	fail "$TEST_NAME nc server start"
	return -1
    }

    pass "$TEST_NAME nc server start"
    return 0
}

# Stop the nc server.
proc stop_nc_server {} {
    global TEST_NAME nc_pipe

    kill -INT [pid $nc_pipe] 5
    catch { close $nc_pipe } res
    pass "$TEST_NAME nc server stop"
    return
}

# "load" generation function for stap_run.  It runs a client version
# of 'nc' and sends some IPv4 data through it.
proc run_ipv4_client {} {
    global srcdir subdir
    global IPV4_ONLY

    catch {
        exec bash -c "cat $srcdir/$subdir/ipaddr.txt > /dev/tcp/127.0.0.1/8079"
    }
    return 0
}

# "load" generation function for stap_run.  It runs a client version
# of 'nc' and sends some IPv6 data through it.
proc run_ipv6_client {} {
    global srcdir subdir
    global IPV4_ONLY

    if {$IPV4_ONLY} {
	verbose -log "error: nc only supports IPv4"
	return 1
    }
    catch {
        exec bash -c "cat $srcdir/$subdir/ipaddr.txt > /dev/tcp/::1/8079"
    }
    return 0
}

# Start the 1st IPv4 test
set TEST_NAME "${TEST_NAME_BASE}_IPv4_recvmsg"
if {[start_nc_server 1]} {
    # If we couldn't start the server, we're done.
    return
}
set script_output "packets = \[0-9\]+\r\naddress errors = 0\r\nbad family errors = 0\r\n"
stap_run $TEST_NAME run_ipv4_client $script_output $srcdir/$subdir/ipaddr1.stp

# Stop/cleanup the IPv4 server.
stop_nc_server

# Start the 2nd IPv4 test
set TEST_NAME "${TEST_NAME_BASE}_IPv4_receive"
if {[start_nc_server 1]} {
    # If we couldn't start the server, we're done.
    return
}
stap_run $TEST_NAME run_ipv4_client $script_output $srcdir/$subdir/ipaddr2.stp

# Stop/cleanup the IPv4 server
stop_nc_server

# Start the 1st IPv6 test
set TEST_NAME "${TEST_NAME_BASE}_IPv6_recvmsg"
if {[start_nc_server 0]} {
    # If we couldn't start the server, we're done.
    return
}
stap_run $TEST_NAME run_ipv6_client $script_output $srcdir/$subdir/ipaddr1.stp

# Stop/cleanup the IPv6 server.
stop_nc_server

# Start the 2nd IPv6 test
set TEST_NAME "${TEST_NAME_BASE}_IPv6_receive"
if {[start_nc_server 0]} {
    # If we couldn't start the server, we're done.
    return
}
stap_run $TEST_NAME run_ipv6_client $script_output $srcdir/$subdir/ipaddr2.stp

# Stop/cleanup the IPv6 server.
stop_nc_server