279 lines
7.0 KiB
Perl
Executable File
279 lines
7.0 KiB
Perl
Executable File
#!/usr/bin/perl -w
|
|
|
|
=head1 NAME
|
|
|
|
serial-console
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
serial-console [options]
|
|
|
|
Options:
|
|
|
|
-h,--help Display brief help message
|
|
-v,--verbose Increase verbosity
|
|
-q,--quiet Decrease verbosity
|
|
-l,--log FILE Log output to file
|
|
-r,--rcfile FILE Modify specified bochsrc file
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
C<serial-console> provides a virtual serial console for use with
|
|
Bochs. Running C<serial-console> creates a pseudo-tty. The master
|
|
side of this pty is made available to the user for interaction; the
|
|
slave device is written to the Bochs configuration file
|
|
(C<bochsrc.txt>) for use by a subsequent Bochs session.
|
|
|
|
=head1 EXAMPLES
|
|
|
|
=over 4
|
|
|
|
=item C<serial-console>
|
|
|
|
Create a virtual serial console for Bochs, modify C<bochsrc.txt>
|
|
appropriately.
|
|
|
|
=item C<serial-console -r ../.bochsrc -l serial.log>
|
|
|
|
Create a virtual serial console for Bochs, modify C<../.bochsrc>
|
|
appropriately, log output to C<serial.log>.
|
|
|
|
=back
|
|
|
|
=head1 INVOCATION
|
|
|
|
Before starting Bochs, run C<serial-console> in a different session
|
|
(e.g. a different xterm window). When you subsequently start Bochs,
|
|
anything that the emulated machine writes to its serial port will
|
|
appear in the window running C<serial-console>, and anything typed in
|
|
the C<serial-console> window will arrive on the emulated machine's
|
|
serial port.
|
|
|
|
You do B<not> need to rerun C<serial-console> afresh for each Bochs
|
|
session.
|
|
|
|
=head1 OPTIONS
|
|
|
|
=over 4
|
|
|
|
=item B<-l,--log FILE>
|
|
|
|
Log all output (i.e. everything that is printed in the
|
|
C<serial-console> window) to the specified file.
|
|
|
|
=item B<-r,--rcfile FILE>
|
|
|
|
Modify the specified bochsrc file. The file will be updated to
|
|
contain the path to the slave side of the psuedo tty that we create.
|
|
The original file will be restored when C<serial-console> exits. The
|
|
default is to modify the file C<bochsrc.txt> in the current directory.
|
|
|
|
To avoid modifying any bochsrc file, use C<--norcfile>.
|
|
|
|
=back
|
|
|
|
=cut
|
|
|
|
use IO::Pty;
|
|
use IO::Select;
|
|
use File::Spec::Functions qw ( :ALL );
|
|
use Getopt::Long;
|
|
use Pod::Usage;
|
|
use POSIX qw ( :termios_h );
|
|
use strict;
|
|
use warnings;
|
|
|
|
my $o;
|
|
my $restore_file = {};
|
|
my $restore_termios;
|
|
use constant BLOCKSIZE => 8192;
|
|
|
|
##############################################################################
|
|
#
|
|
# Parse command line options into options hash ($o)
|
|
#
|
|
# $o = parse_opts();
|
|
|
|
sub parse_opts {
|
|
# $o is the hash that will hold the options
|
|
my $o = {
|
|
verbosity => 1,
|
|
rcfile => 'bochsrc.txt',
|
|
};
|
|
# Special handlers for some options
|
|
my $opt_handlers = {
|
|
verbose => sub { $o->{verbosity}++; },
|
|
quiet => sub { $o->{verbosity}--; },
|
|
help => sub { pod2usage(1); },
|
|
norcfile => sub { delete $o->{rcfile}; },
|
|
};
|
|
# Merge handlers into main options hash (so that Getopt::Long can find them)
|
|
$o->{$_} = $opt_handlers->{$_} foreach keys %$opt_handlers;
|
|
# Option specifiers for Getopt::Long
|
|
my @optspec = ( 'help|h|?',
|
|
'quiet|q+',
|
|
'verbose|v+',
|
|
'log|l=s',
|
|
'rcfile|r=s',
|
|
'norcfile',
|
|
);
|
|
# Do option parsing
|
|
Getopt::Long::Configure ( 'bundling' );
|
|
pod2usage("Error parsing command-line options") unless GetOptions (
|
|
$o, @optspec );
|
|
# Clean up $o by removing the handlers
|
|
delete $o->{$_} foreach keys %$opt_handlers;
|
|
return $o;
|
|
}
|
|
|
|
##############################################################################
|
|
#
|
|
# Modify bochsrc file
|
|
|
|
sub patch_bochsrc {
|
|
my $active = shift;
|
|
my $pty = shift;
|
|
|
|
# Rename active file to backup file
|
|
( my $vol, my $dir, my $file ) = splitpath ( $active );
|
|
$file = '.'.$file.".serial-console";
|
|
my $backup = catpath ( $vol, $dir, $file );
|
|
rename $active, $backup
|
|
or die "Could not back up $active to $backup: $!\n";
|
|
|
|
# Derive line to be inserted
|
|
my $patch = "com1: enabled=1, dev=$pty\n";
|
|
|
|
# Modify file
|
|
open my $old, "<$backup" or die "Could not open $backup: $!\n";
|
|
open my $new, ">$active" or die "Could not open $active: $!\n";
|
|
print $new <<"EOF";
|
|
##################################################
|
|
#
|
|
# This file has been modified by serial-console.
|
|
#
|
|
# Do not modify this file; it will be erased when
|
|
# serial-console (pid $$) exits and will be
|
|
# replaced with the backup copy held in
|
|
# $backup.
|
|
#
|
|
##################################################
|
|
|
|
|
|
EOF
|
|
my $patched;
|
|
while ( my $line = <$old> ) {
|
|
if ( $line =~ /^\s*\#?\s*com1:\s*\S/ ) {
|
|
if ( ! $patched ) {
|
|
$line = $patch;
|
|
$patched = 1;
|
|
} else {
|
|
$line = '# '.$line unless $line =~ /^\s*\#/;
|
|
}
|
|
}
|
|
print $new $line;
|
|
}
|
|
print $new $patch unless $patched;
|
|
close $old;
|
|
close $new;
|
|
|
|
return $backup;
|
|
}
|
|
|
|
##############################################################################
|
|
#
|
|
# Attach/detach message printing and terminal settings
|
|
|
|
sub bochs_attached {
|
|
print STDERR "Bochs attached.\n\n\n"
|
|
if $o->{verbosity} >= 1;
|
|
}
|
|
|
|
sub bochs_detached {
|
|
print STDERR "\n\nWaiting for bochs to attach...\n"
|
|
if $o->{verbosity} >= 1;
|
|
}
|
|
|
|
##############################################################################
|
|
#
|
|
# Main program
|
|
|
|
$o = parse_opts();
|
|
pod2usage(1) if @ARGV;
|
|
|
|
# Catch signals
|
|
my $sigdie = sub { die "Exiting via signal\n"; };
|
|
$SIG{INT} = $sigdie;
|
|
|
|
# Create Pty, close slave side
|
|
my $pty = IO::Pty->new();
|
|
$pty->close_slave();
|
|
$pty->set_raw();
|
|
print STDERR "Slave pty is ".$pty->ttyname."\n" if $o->{verbosity} >= 1;
|
|
|
|
# Open logfile
|
|
my $log;
|
|
if ( $o->{log} ) {
|
|
open $log, ">$o->{log}" or die "Could not open $o->{log}: $!\n";
|
|
}
|
|
|
|
# Set up terminal
|
|
my $termios;
|
|
if ( -t STDIN ) {
|
|
$termios = POSIX::Termios->new;
|
|
$restore_termios = POSIX::Termios->new;
|
|
$termios->getattr ( fileno(STDIN) );
|
|
$restore_termios->getattr ( fileno(STDIN) );
|
|
$termios->setlflag ( $termios->getlflag &
|
|
~(ICANON) & ~(ECHO) );
|
|
$termios->setattr ( fileno(STDIN), TCSANOW );
|
|
}
|
|
|
|
# Modify bochsrc file
|
|
$restore_file = { $o->{rcfile} =>
|
|
patch_bochsrc ( $o->{rcfile}, $pty->ttyname ) }
|
|
if $o->{rcfile};
|
|
|
|
# Start character shunt
|
|
my $attached = 1;
|
|
my $select = IO::Select->new ( \*STDIN, $pty );
|
|
while ( 1 ) {
|
|
my %can_read = map { $_ => 1 }
|
|
$select->can_read ( $attached ? undef : 1 );
|
|
if ( $can_read{\*STDIN} ) {
|
|
sysread ( STDIN, my $data, BLOCKSIZE )
|
|
or die "Cannot read from STDIN: $!\n";
|
|
$pty->syswrite ( $data );
|
|
}
|
|
if ( $can_read{$pty} ) {
|
|
if ( $pty->sysread ( my $data, BLOCKSIZE ) ) {
|
|
# Actual data available
|
|
bochs_attached() if $attached == 0;
|
|
$attached = 1;
|
|
syswrite ( STDOUT, $data );
|
|
$log->syswrite ( $data ) if $log;
|
|
} else {
|
|
# No data available but select() says we can read. This almost
|
|
# certainly indicates that nothing is attached to the slave.
|
|
bochs_detached() if $attached == 1;
|
|
$attached = 0;
|
|
sleep ( 1 );
|
|
}
|
|
} else {
|
|
bochs_attached() if $attached == 0;
|
|
$attached = 1;
|
|
}
|
|
}
|
|
|
|
END {
|
|
# Restore bochsrc file if applicable
|
|
if ( ( my $orig_file, my $backup_file ) = %$restore_file ) {
|
|
unlink $orig_file;
|
|
rename $backup_file, $orig_file;
|
|
}
|
|
# Restore terminal settings if applicable
|
|
if ( $restore_termios ) {
|
|
$restore_termios->setattr ( fileno(STDIN), TCSANOW );
|
|
}
|
|
}
|