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# $OpenBSD: funcs.pl,v 1.6 2017/08/15 04:11:20 bluhm Exp $
# Copyright (c) 2010-2015 Alexander Bluhm <bluhm@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
use strict;
use warnings;
use Socket;
use Socket6;
########################################################################
# Client and Server funcs
########################################################################
sub write_read_stream {
my $self = shift;
my $out = ref($self). "\n";
print $out;
IO::Handle::flush(\*STDOUT);
print STDERR ">>> $out";
my $in = <STDIN>;
print STDERR "<<< $in";
}
sub write_datagram {
my $self = shift;
my $dgram = shift;
my $out = $dgram || ref($self). "\n";
my $addr = $self->{toaddr};
my $port = $self->{toport};
if ($addr) {
my ($to, $netaddr);
if ($self->{af} eq "inet") {
$netaddr = inet_pton(AF_INET, $addr);
$to = pack_sockaddr_in($port, $netaddr);
} else {
$netaddr = inet_pton(AF_INET6, $addr);
$to = pack_sockaddr_in6($port, $netaddr);
}
$self->{toaddr} = $addr;
$self->{toport} = $port;
print STDERR "send to: $addr $port\n";
send(STDOUT, $out, 0, $to)
or die ref($self), " send to failed: $!";
} else {
send(STDOUT, $out, 0)
or die ref($self), " send failed: $!";
}
unless ($dgram) {
print STDERR ">>> $out";
}
}
sub read_datagram {
my $self = shift;
my $dgram = shift;
my $from = recv(STDIN, my $in, 70000, 0)
or die ref($self), " recv from failed: $!";
# Raw sockets include the IPv4 header.
if ($self->{socktype} && $self->{socktype} == Socket::SOCK_RAW &&
$self->{af} eq "inet") {
substr($in, 0, 20, "");
}
my ($port, $netaddr, $addr);
if ($self->{af} eq "inet") {
($port, $netaddr) = unpack_sockaddr_in($from);
$addr = inet_ntop(AF_INET, $netaddr);
} else {
($port, $netaddr) = unpack_sockaddr_in6($from);
$addr = inet_ntop(AF_INET6, $netaddr);
}
$self->{fromaddr} = $addr;
$self->{fromport} = $port;
print STDERR "recv from: $addr $port\n";
if ($dgram) {
$$dgram = $in;
} else {
print STDERR "<<< $in";
}
}
sub write_read_datagram {
my $self = shift;
write_datagram($self);
read_datagram($self);
}
sub read_write_datagram {
my $self = shift;
read_datagram($self);
$self->{toaddr} = $self->{fromaddr};
$self->{toport} = $self->{fromport};
write_datagram($self);
}
sub read_write_packet {
my $self = shift;
my $packet;
read_datagram($self, \$packet);
my $hexin = unpack("H*", $packet);
print STDERR "<<< $hexin\n";
$packet =~ s/Client|Server/Packet/;
$self->{toaddr} = $self->{fromaddr};
$self->{toport} = $self->{fromport};
write_datagram($self, $packet);
my $hexout = unpack("H*", $packet);
print STDERR ">>> $hexout\n";
}
sub in_cksum {
my $data = shift;
my $sum = 0;
$data .= pack("x") if (length($data) & 1);
while (length($data)) {
$sum += unpack("n", substr($data, 0, 2, ""));
$sum = ($sum >> 16) + ($sum & 0xffff) if ($sum > 0xffff);
}
return (~$sum & 0xffff);
}
use constant IPPROTO_ICMPV6 => 58;
use constant ICMP_ECHO => 8;
use constant ICMP_ECHOREPLY => 0;
use constant ICMP6_ECHO_REQUEST => 128;
use constant ICMP6_ECHO_REPLY => 129;
my $seq = 0;
sub write_icmp_echo {
my $self = shift;
my $pid = shift || $$;
my $af = $self->{af};
my $type = $af eq "inet" ? ICMP_ECHO : ICMP6_ECHO_REQUEST;
# type, code, cksum, id, seq
my $icmp = pack("CCnnn", $type, 0, 0, $pid, ++$seq);
if ($af eq "inet") {
substr($icmp, 2, 2, pack("n", in_cksum($icmp)));
} else {
# src, dst, plen, pad, next
my $phdr = "";
$phdr .= inet_pton(AF_INET6, $self->{srcaddr});
$phdr .= inet_pton(AF_INET6, $self->{dstaddr});
$phdr .= pack("NxxxC", length($icmp), IPPROTO_ICMPV6);
print STDERR "pseudo header: ", unpack("H*", $phdr), "\n";
substr($icmp, 2, 2, pack("n", in_cksum($phdr. $icmp)));
}
write_datagram($self, $icmp);
my $text = $af eq "inet" ? "ICMP" : "ICMP6";
print STDERR ">>> $text ", unpack("H*", $icmp), "\n";
}
sub read_icmp_echo {
my $self = shift;
my $reply = shift;
my $af = $self->{af};
my $icmp;
read_datagram($self, \$icmp);
my $text = $af eq "inet" ? "ICMP" : "ICMP6";
$text .= " reply" if $reply;
my $phdr = "";
if ($af eq "inet6") {
# src, dst, plen, pad, next
$phdr .= inet_pton(AF_INET6, $self->{srcaddr});
$phdr .= inet_pton(AF_INET6, $self->{dstaddr});
$phdr .= pack("NxxxC", length($icmp), IPPROTO_ICMPV6);
print STDERR "pseudo header: ", unpack("H*", $phdr), "\n";
}
if (length($icmp) < 8) {
$text = "BAD $text LENGTH";
} elsif (in_cksum($phdr. $icmp) != 0) {
$text = "BAD $text CHECKSUM";
} else {
my($type, $code, $cksum, $id, $seq) = unpack("CCnnn", $icmp);
my $t = $reply ?
($af eq "inet" ? ICMP_ECHOREPLY : ICMP6_ECHO_REPLY) :
($af eq "inet" ? ICMP_ECHO : ICMP6_ECHO_REQUEST);
if ($type != $t) {
$text = "BAD $text TYPE";
} elsif ($code != 0) {
$text = "BAD $text CODE";
}
}
print STDERR "<<< $text ", unpack("H*", $icmp), "\n";
}
########################################################################
# Script funcs
########################################################################
sub check_logs {
my ($c, $r, $s, %args) = @_;
return if $args{nocheck};
check_inout($c, $r, $s, %args);
}
sub check_inout {
my ($c, $r, $s, %args) = @_;
if ($args{client} && !$args{client}{nocheck}) {
my $out = $args{client}{out} || "Client";
$c->loggrep(qr/^>>> $out/) or die "no client output"
unless $args{client}{noout};
my $in = $args{client}{in} || "Server";
$c->loggrep(qr/^<<< $in/) or die "no client input"
unless $args{client}{noin};
}
if ($args{packet} && !$args{packet}{nocheck}) {
my $hex;
my $in = $args{packet}{in} || $args{packet}{noin}
or die "no packet input regex";
$hex = unpack("H*", $in);
$r->loggrep(qr/Packet: <<< .*$hex/) or die "no packet input"
unless $args{packet}{noin};
my $out = $args{packet}{out} || "Packet";
$hex = unpack("H*", $out);
$r->loggrep(qr/Packet: >>> .*$hex/) or die "no packet output"
unless $args{packet}{noout};
}
if ($args{server} && !$args{server}{nocheck}) {
my $in = $args{server}{in} || "Client";
$s->loggrep(qr/^<<< $in/) or die "no server input"
unless $args{server}{noin};
my $out = $args{server}{out} || "Server";
$s->loggrep(qr/^>>> $out/) or die "no server output"
unless $args{server}{noout};
}
}
1;
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