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