forked from Mirror/pve-network
sdn: dhcp: add dnsmasq plugin
The plugin creates a dnsmasq@<zone> service that spawns a dnsmasq instance that handles dhcp for that zone. The configuration files for a dnsmasq instance lie within /etc/dnsmasq.d/<zone> The plugin generates the following configuration files: * 00-default.conf Contains the default global configuration for dnsmasq. Disables DNS, enables some specific options for Windows, does some security-related configuration and makes dnsmasq bind only to the interfaces it is responsible for * 10-<subnet>.conf Contains the default settings for a subnet. Sets dhcp options for DNS and gateway. * 10-<subnet>.ranges.conf Contains the configuration of DHCP ranges for a subnet. * ethers Contains the MAC address to IP mappings for a zone. Every subnet gets assigned a tag in the dnsmasq configuration that is equal to the subnet_id. This can be used to override / set additional configuration options on a per-subnet basis. Additionally it creates the file /etc/default/dnsmasq.<zone> that provides default options for the dnsmasq service. Leases are stored in /var/lib/misc/dnsmasq.<zone>. Co-Authored-By: Alexandre Derumier <aderumier@odiso.com> Signed-off-by: Stefan Hanreich <s.hanreich@proxmox.com>
This commit is contained in:
Stefan Hanreich
Thomas Lamprecht
parent
b240ff0b1f
commit
33074dfbee
1
debian/control
vendored
1
debian/control
vendored
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@ -24,6 +24,7 @@ Depends: libpve-common-perl (>= 5.0-45),
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${misc:Depends},
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${perl:Depends},
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Recommends: frr-pythontools (>= 8.5.1~), ifupdown2
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Suggests: dnsmasq
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Description: Proxmox VE's SDN (Software Defined Network) stack
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This package contains the Software Defined Network (tech preview) for
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Proxmox VE.
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198
src/PVE/Network/SDN/Dhcp/Dnsmasq.pm
Normal file
198
src/PVE/Network/SDN/Dhcp/Dnsmasq.pm
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@ -0,0 +1,198 @@
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package PVE::Network::SDN::Dhcp::Dnsmasq;
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use strict;
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use warnings;
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use base qw(PVE::Network::SDN::Dhcp::Plugin);
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use Net::IP qw(:PROC);
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use PVE::Tools qw(file_set_contents run_command lock_file);
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use File::Copy;
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my $DNSMASQ_CONFIG_ROOT = '/etc/dnsmasq.d';
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my $DNSMASQ_DEFAULT_ROOT = '/etc/default';
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my $DNSMASQ_LEASE_ROOT = '/var/lib/misc';
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sub type {
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return 'dnsmasq';
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}
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sub del_ip_mapping {
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my ($class, $dhcpid, $mac) = @_;
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my $ethers_file = "$DNSMASQ_CONFIG_ROOT/$dhcpid/ethers";
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my $ethers_tmp_file = "$ethers_file.tmp";
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my $removeFn = sub {
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open(my $in, '<', $ethers_file) or die "Could not open file '$ethers_file' $!\n";
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open(my $out, '>', $ethers_tmp_file) or die "Could not open file '$ethers_tmp_file' $!\n";
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while (my $line = <$in>) {
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next if $line =~ m/^$mac/;
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print $out $line;
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}
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close $in;
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close $out;
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move $ethers_tmp_file, $ethers_file;
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chmod 0644, $ethers_file;
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};
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PVE::Tools::lock_file($ethers_file, 10, $removeFn);
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if ($@) {
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warn "Unable to remove $mac from the dnsmasq configuration: $@\n";
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return;
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}
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my $service_name = "dnsmasq\@$dhcpid";
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PVE::Tools::run_command(['systemctl', 'reload', $service_name]);
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}
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sub add_ip_mapping {
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my ($class, $dhcpid, $mac, $ip) = @_;
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my $ethers_file = "$DNSMASQ_CONFIG_ROOT/$dhcpid/ethers";
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my $ethers_tmp_file = "$ethers_file.tmp";
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my $appendFn = sub {
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open(my $in, '<', $ethers_file) or die "Could not open file '$ethers_file' $!\n";
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open(my $out, '>', $ethers_tmp_file) or die "Could not open file '$ethers_tmp_file' $!\n";
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while (my $line = <$in>) {
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next if $line =~ m/^$mac/;
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print $out $line;
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}
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print $out "$mac,$ip\n";
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close $in;
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close $out;
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move $ethers_tmp_file, $ethers_file;
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chmod 0644, $ethers_file;
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};
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PVE::Tools::lock_file($ethers_file, 10, $appendFn);
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if ($@) {
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warn "Unable to add $mac/$ip to the dnsmasq configuration: $@\n";
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return;
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}
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my $service_name = "dnsmasq\@$dhcpid";
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PVE::Tools::run_command(['systemctl', 'reload', $service_name]);
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}
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sub configure_subnet {
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my ($class, $dhcpid, $subnet_config) = @_;
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die "No gateway defined for subnet $subnet_config->{id}"
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if !$subnet_config->{gateway};
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my $tag = $subnet_config->{id};
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my @dnsmasq_config = (
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"listen-address=$subnet_config->{gateway}",
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);
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my $option_string;
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if (ip_is_ipv6($subnet_config->{network})) {
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$option_string = 'option6';
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push @dnsmasq_config, "enable-ra";
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} else {
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$option_string = 'option';
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push @dnsmasq_config, "dhcp-option=tag:$tag,$option_string:router,$subnet_config->{gateway}";
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}
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push @dnsmasq_config, "dhcp-option=tag:$tag,$option_string:dns-server,$subnet_config->{'dhcp-dns-server'}"
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if $subnet_config->{'dhcp-dns-server'};
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PVE::Tools::file_set_contents(
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"$DNSMASQ_CONFIG_ROOT/$dhcpid/10-$subnet_config->{id}.conf",
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join("\n", @dnsmasq_config) . "\n"
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);
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}
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sub configure_range {
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my ($class, $dhcpid, $subnet_config, $range_config) = @_;
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my $range_file = "$DNSMASQ_CONFIG_ROOT/$dhcpid/10-$subnet_config->{id}.ranges.conf",
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my $tag = $subnet_config->{id};
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open(my $fh, '>>', $range_file) or die "Could not open file '$range_file' $!\n";
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print $fh "dhcp-range=set:$tag,$range_config->{'start-address'},$range_config->{'end-address'}\n";
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close $fh;
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}
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sub before_configure {
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my ($class, $dhcpid) = @_;
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my $config_directory = "$DNSMASQ_CONFIG_ROOT/$dhcpid";
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mkdir($config_directory, 755) if !-d $config_directory;
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my $default_config = <<CFG;
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CONFIG_DIR='$config_directory,\*.conf'
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DNSMASQ_OPTS="--conf-file=/dev/null"
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CFG
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PVE::Tools::file_set_contents(
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"$DNSMASQ_DEFAULT_ROOT/dnsmasq.$dhcpid",
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$default_config
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);
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my $default_dnsmasq_config = <<CFG;
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except-interface=lo
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bind-dynamic
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no-resolv
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no-hosts
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dhcp-leasefile=$DNSMASQ_LEASE_ROOT/dnsmasq.$dhcpid.leases
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dhcp-hostsfile=$config_directory/ethers
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dhcp-ignore=tag:!known
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# Send an empty WPAD option. This may be REQUIRED to get windows 7 to behave.
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dhcp-option=252,"\\n"
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# Send microsoft-specific option to tell windows to release the DHCP lease
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# when it shuts down. Note the "i" flag, to tell dnsmasq to send the
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# value as a four-byte integer - that's what microsoft wants.
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dhcp-option=vendor:MSFT,2,1i
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# If a DHCP client claims that its name is "wpad", ignore that.
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# This fixes a security hole. see CERT Vulnerability VU#598349
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dhcp-name-match=set:wpad-ignore,wpad
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dhcp-ignore-names=tag:wpad-ignore
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CFG
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PVE::Tools::file_set_contents(
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"$config_directory/00-default.conf",
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$default_dnsmasq_config
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);
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unlink glob "$config_directory/10-*.conf";
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}
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sub after_configure {
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my ($class, $dhcpid) = @_;
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my $service_name = "dnsmasq\@$dhcpid";
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PVE::Tools::run_command(['systemctl', 'enable', $service_name]);
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PVE::Tools::run_command(['systemctl', 'restart', $service_name]);
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}
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sub before_regenerate {
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my ($class) = @_;
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PVE::Tools::run_command(['systemctl', 'stop', "dnsmasq@*"]);
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PVE::Tools::run_command(['systemctl', 'disable', 'dnsmasq@']);
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}
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sub after_regenerate {
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my ($class) = @_;
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# noop
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}
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1;
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