123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101 |
- #!/usr/bin/env perl
- # A simple TCP client that sends some data and expects a response.
- # Usage: tcp_client.pl HOSTNAME PORT DATA1 RESPONSE1
- # DATA: hex-encoded data to send to the server
- # RESPONSE: regexp that must match the server's response
- #
- # Copyright The Mbed TLS Contributors
- # SPDX-License-Identifier: Apache-2.0
- #
- # Licensed under the Apache License, Version 2.0 (the "License"); you may
- # not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- use warnings;
- use strict;
- use IO::Socket::INET;
- # Pack hex digits into a binary string, ignoring whitespace.
- sub parse_hex {
- my ($hex) = @_;
- $hex =~ s/\s+//g;
- return pack('H*', $hex);
- }
- ## Open a TCP connection to the specified host and port.
- sub open_connection {
- my ($host, $port) = @_;
- my $socket = IO::Socket::INET->new(PeerAddr => $host,
- PeerPort => $port,
- Proto => 'tcp',
- Timeout => 1);
- die "Cannot connect to $host:$port: $!" unless $socket;
- return $socket;
- }
- ## Close the TCP connection.
- sub close_connection {
- my ($connection) = @_;
- $connection->shutdown(2);
- # Ignore shutdown failures (at least for now)
- return 1;
- }
- ## Write the given data, expressed as hexadecimal
- sub write_data {
- my ($connection, $hexdata) = @_;
- my $data = parse_hex($hexdata);
- my $total_sent = 0;
- while ($total_sent < length($data)) {
- my $sent = $connection->send($data, 0);
- if (!defined $sent) {
- die "Unable to send data: $!";
- }
- $total_sent += $sent;
- }
- return 1;
- }
- ## Read a response and check it against an expected prefix
- sub read_response {
- my ($connection, $expected_hex) = @_;
- my $expected_data = parse_hex($expected_hex);
- my $start_offset = 0;
- while ($start_offset < length($expected_data)) {
- my $actual_data;
- my $ok = $connection->recv($actual_data, length($expected_data));
- if (!defined $ok) {
- die "Unable to receive data: $!";
- }
- if (($actual_data ^ substr($expected_data, $start_offset)) =~ /[^\000]/) {
- printf STDERR ("Received \\x%02x instead of \\x%02x at offset %d\n",
- ord(substr($actual_data, $-[0], 1)),
- ord(substr($expected_data, $start_offset + $-[0], 1)),
- $start_offset + $-[0]);
- return 0;
- }
- $start_offset += length($actual_data);
- }
- return 1;
- }
- if (@ARGV != 4) {
- print STDERR "Usage: $0 HOSTNAME PORT DATA1 RESPONSE1\n";
- exit(3);
- }
- my ($host, $port, $data1, $response1) = @ARGV;
- my $connection = open_connection($host, $port);
- write_data($connection, $data1);
- if (!read_response($connection, $response1)) {
- exit(1);
- }
- close_connection($connection);
|