PAL.C.T MINI SHELL
# Networking functions for Gentoo 2006+
do 'linux-lib.pl';
$gentoo_net_config = "/etc/conf.d/net";
$min_virtual_number = 1;
# parse_gentoo_net()
# Parses the Gentoo net config file into an array of named sections
sub parse_gentoo_net
{
my @rv;
my $sect;
my $lnum = 0;
open(CONF, "<".$gentoo_net_config);
while(<CONF>) {
s/\r|\n//g;
s/#.*$//;
if (/^\s*(\S+)\s*=\s*\((.*)/) {
# Start of some section, which may span several lines
$sect = { 'name' => $1,
'line' => $lnum };
push(@rv, $sect);
my $v = $2;
if ($v =~ /^(.*)\)/) {
# Ends on same line
$sect->{'values'} = [ &split_gentoo_values("$1") ];
$sect->{'eline'} = $lnum;
$sect = undef;
}
else {
# May span multiple
$sect->{'values'} = [ &split_gentoo_values($v) ];
}
}
elsif (/^\s*\)/ && $sect) {
# End of a section
$sect->{'eline'} = $lnum;
$sect = undef;
}
elsif (/^\s*(".*")\s*\)/ && $sect) {
# End of a section, but with some values before it
push(@{$sect->{'values'}}, &split_gentoo_values("$1"));
$sect->{'eline'} = $lnum;
$sect = undef;
}
elsif (/^\s*(".*")/ && $sect) {
# Values within a section
push(@{$sect->{'values'}}, &split_gentoo_values("$1"));
}
$lnum++;
}
close(CONF);
return @rv;
}
# save_gentoo_net(&old, &new)
# Update or create a Gentoo net config file section
sub save_gentoo_net
{
my ($old, $new) = @_;
my @lines;
if ($new) {
push(@lines, $new->{'name'}."=(");
foreach my $v (@{$new->{'values'}}) {
push(@lines," \"$v\"");
}
push(@lines, ")");
}
my $lref = &read_file_lines($gentoo_net_config);
if ($old && $new) {
# Replace section
splice(@$lref, $old->{'line'}, $old->{'eline'}-$old->{'line'}+1,
@lines);
$new->{'eline'} = $new->{'line'}+scalar(@lines)-1;
}
elsif ($old && !$new) {
# Delete section
splice(@$lref, $old->{'line'}, $old->{'eline'}-$old->{'line'}+1);
}
elsif (!$old && $new) {
# Add section
$new->{'line'} = scalar(@$lref);
$new->{'eline'} = $new->{'line'}+scalar(@lines)-1;
push(@$lref, @lines);
}
&flush_file_lines($gentoo_net_config);
}
# split_gentoo_values(string)
# Splits a string like "foo bar" "smeg spod" into an array
sub split_gentoo_values
{
my ($str) = @_;
my @rv;
while($str =~ /^\s*"([^"]+)",?(.*)/) {
push(@rv, $1);
$str = $2;
}
return @rv;
}
# boot_interfaces()
# Returns a list of interfaces brought up at boot time
sub boot_interfaces
{
my @rv;
foreach my $g (&parse_gentoo_net()) {
if ($g->{'name'} =~ /^config_(\S+)/) {
my $gn = $1;
my $n = 0;
foreach my $v (@{$g->{'values'}}) {
# An interface definition
my $iface = { 'name' => $gn,
'up' => 1,
'edit' => 1,
'index' => scalar(@rv) };
if ($n == 0) {
$iface->{'fullname'} = $gn;
}
else {
$iface->{'fullname'} = $gn.":".$n;
$iface->{'virtual'} = $n;
}
my @w = split(/\s+/, $v);
if ($w[0] eq "dhcp") {
$iface->{'dhcp'} = 1;
}
elsif ($w[0] eq "noop") {
# Skipped, but still uses a up a number
$n++;
next;
}
if (&check_ipaddress($w[0])) {
$iface->{'address'} = $w[0];
}
elsif ($w[0] =~ /^([0-9\.]+)\/(\d+)$/) {
$iface->{'address'} = $1;
$iface->{'netmask'} = &prefix_to_mask($2);
}
for($i=1; $i<@w; $i++) {
if ($w[$i] eq "netmask") {
$iface->{'netmask'} = $w[++$i];
}
elsif ($w[$i] eq "broadcast") {
$iface->{'broadcast'} = $w[++$i];
}
elsif ($w[$i] eq "mtu") {
$iface->{'mtu'} = $w[++$i];
}
}
if ($iface->{'address'} && $iface->{'netmask'}) {
$iface->{'broadcast'} ||= &compute_broadcast(
$iface->{'address'}, $iface->{'netmask'});
}
$iface->{'gentoo'} = $g;
push(@rv, $iface);
$n++;
}
}
elsif ($g->{'name'} =~ /^routes_(\S+)/) {
# A route definition for an interface
my ($iface) = grep { $_->{'fullname'} eq $1 } @rv;
my $spec = $g->{'values'}->[0];
if ($iface) {
if ($spec =~ /default\s+via\s+([0-9\.]+)/ ||
$spec =~ /default\s+([0-9\.]+)/) {
$iface->{'gateway'} = $1;
$iface->{'gentoogw'} = $g;
}
}
}
$lnum++;
}
return @rv;
}
# save_interface(&details)
# Create or update a boot-time interface
sub save_interface
{
my ($iface) = @_;
&lock_file($gentoo_net_config);
# Build the interface line
my @w;
if ($iface->{'dhcp'}) {
push(@w, "dhcp");
}
else {
push(@w, $iface->{'address'});
if ($iface->{'netmask'}) {
push(@w, "netmask", $iface->{'netmask'});
}
if ($iface->{'broadcast'}) {
push(@w, "broadcast", $iface->{'broadcast'});
}
if ($iface->{'mtu'}) {
push(@w, "mtu", $iface->{'mtu'});
}
}
# Find the current block for this interface
my @gentoo = &parse_gentoo_net();
my ($g) = grep { $_->{'name'} eq 'config_'.$iface->{'name'} } @gentoo;
if ($g) {
# Found it .. append or replace
while (!$g->{'values'}->[$iface->{'virtual'}]) {
push(@{$g->{'values'}}, "noop");
}
$g->{'values'}->[$iface->{'virtual'}] = join(" ", @w);
&save_gentoo_net($g, $g);
}
else {
# Needs a new block
$g = { 'name' => $iface->{'name'},
'values' => [ join(" ", @w) ] };
&save_gentoo_net(undef, $g);
}
&unlock_file($gentoo_net_config);
}
# delete_interface(&details)
# Delete a boot-time interface
sub delete_interface
{
my ($iface) = @_;
# Find the current block for this interface
&lock_file($gentoo_net_config);
my @gentoo = &parse_gentoo_net();
my ($g) = grep { $_->{'name'} eq 'config_'.$iface->{'name'} } @gentoo;
if ($g) {
# Found it .. take out the interface
if ($iface->{'virtual'} == scalar(@{$g->{'values'}})-1) {
# Last one
pop(@{$g->{'values'}});
}
else {
$g->{'values'}->[$iface->{'virtual'}] = 'noop';
}
&save_gentoo_net($g, $g);
}
&unlock_file($gentoo_net_config);
}
# can_edit(what)
# Can some boot-time interface parameter be edited?
sub can_edit
{
return $_[0] ne 'up' && $_[0] ne 'bootp';
}
sub can_broadcast_def
{
return 0;
}
# valid_boot_address(address)
# Is some address valid for a bootup interface
sub valid_boot_address
{
return &check_ipaddress($_[0]);
}
# get_hostname()
sub get_hostname
{
my %host;
&read_env_file("/etc/conf.d/hostname", \%host);
if ($host{'HOSTNAME'}) {
return $host{'HOSTNAME'};
}
return &get_system_hostname();
}
# save_hostname(name)
sub save_hostname
{
my ($hostname) = @_;
my %host;
&read_env_file("/etc/conf.d/hostname", \%host);
$host{'HOSTNAME'} = $hostname;
&write_env_file("/etc/conf.d/hostname", \%host);
&system_logged("hostname ".quotemeta($hostname)." >/dev/null 2>&1");
}
# routing_input()
# Prints HTML for editing routing settings
sub routing_input
{
my ($gw, $dev) = &get_default_gateway();
my @ifaces = grep { $_->{'virtual'} eq '' } &boot_interfaces();
print &ui_table_row($text{'routes_def'},
&ui_radio("route_def", $gw ? 0 : 1,
[ [ 1, $text{'routes_nogw'}."<br>" ],
[ 0, &text('routes_ggw',
&ui_textbox("gw", $gw, 20),
&ui_select("dev", $dev,
[ map { $_->{'name'} } @ifaces ])) ] ]));
}
# parse_routing()
# Applies settings from routing_input form
sub parse_routing
{
if ($in{'route_def'}) {
&set_default_gateway();
}
else {
&check_ipaddress($in{'gw'}) ||
&error(&text('routes_edefault', &html_escape($in{'gw'})));
&set_default_gateway($in{'gw'}, $in{'dev'});
}
}
# apply_network()
# Apply the interface and routing settings
sub apply_network
{
opendir(DIR, "/etc/init.d");
foreach my $f (readdir(DIR)) {
if ($f =~ /^net.(\S+)/ && $1 ne "lo") {
&system_logged("cd / ; /etc/init.d/$f restart >/dev/null 2>&1 </dev/null");
}
}
closedir(DIR);
}
# get_default_gateway()
# Returns the default gateway IP (if one is set) and device (if set) boot time
# settings.
sub get_default_gateway
{
my @ifaces = &boot_interfaces();
my ($iface) = grep { $_->{'gateway'} } @ifaces;
if ($iface) {
return ( $iface->{'gateway'}, $iface->{'name'} );
}
else {
return ( );
}
}
# set_default_gateway(gateway, device)
# Sets the default gateway to the given IP accessible via the given device,
# in the boot time settings.
sub set_default_gateway
{
my ($gw, $dev) = @_;
&lock_file($gentoo_net_config);
my @ifaces = &boot_interfaces();
my ($iface) = grep { $_->{'gateway'} } @ifaces;
if ($iface && $gw) {
# Change existing default route
$g = $iface->{'gentoogw'};
$g->{'name'} = 'routes_'.$dev;
$g->{'values'}->[0] = "default via $gw";
&save_gentoo_net($g, $g);
}
elsif ($iface && !$gw) {
# Deleting existing default route
$g = $iface->{'gentoogw'};
&save_gentoo_net($g, undef);
}
elsif (!$iface && $gw) {
# Adding new default route
$g = { 'name' => 'routes_'.$dev,
'values' => [ "default via $gw" ] };
&save_gentoo_net(undef, $g);
}
&unlock_file($gentoo_net_config);
}
# supports_address6([&iface])
# Returns 1 if managing IPv6 interfaces is supported
sub supports_address6
{
my ($iface) = @_;
return 0;
}
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