263 lines
8.1 KiB
Go
263 lines
8.1 KiB
Go
package render
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import (
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_ "embed"
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"encoding/base64"
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"fmt"
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"strings"
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"go.yaml.in/yaml/v3"
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"git.g3e.fr/syonad/two/internal/lab/topology"
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)
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const (
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SwitchScript = "/usr/local/sbin/lab-switch"
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SwitchNFT = "/etc/lab-switch.nft"
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SwitchUnit = "/etc/systemd/system/lab-switch.service"
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NodeScript = "/usr/local/sbin/lab-node"
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NodeUnit = "/etc/systemd/system/lab-node.service"
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FRRKey = "/usr/share/keyrings/frrouting.gpg"
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FRRConfig = "/etc/lab/frr.conf"
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FRRScript = "/usr/local/sbin/lab-frr"
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FRRSuite = "frr-stable"
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FRRRepo = "https://deb.frrouting.org/frr"
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FRRPackages = "frr frr-pythontools"
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)
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//go:embed frrouting.gpg
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var frrKey []byte
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type metaDoc struct {
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InstanceID string `yaml:"instance-id"`
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LocalHostname string `yaml:"local-hostname"`
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}
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type writeFile struct {
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Path string `yaml:"path"`
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Permissions string `yaml:"permissions"`
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Encoding string `yaml:"encoding,omitempty"`
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Content string `yaml:"content"`
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}
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type cloudConfig struct {
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Hostname string `yaml:"hostname"`
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SSHPwauth bool `yaml:"ssh_pwauth"`
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DisableRoot bool `yaml:"disable_root"`
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SSHAuthorizedKeys []string `yaml:"ssh_authorized_keys"`
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Packages []string `yaml:"packages,omitempty"`
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WriteFiles []writeFile `yaml:"write_files,omitempty"`
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Runcmd [][]string `yaml:"runcmd,omitempty"`
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}
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type match struct {
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MACAddress string `yaml:"macaddress"`
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}
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type route struct {
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To string `yaml:"to"`
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Via string `yaml:"via"`
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}
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type nameservers struct {
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Addresses []string `yaml:"addresses"`
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}
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type ethernet struct {
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Match match `yaml:"match"`
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SetName string `yaml:"set-name"`
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DHCP4 bool `yaml:"dhcp4"`
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MTU int `yaml:"mtu,omitempty"`
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Addresses []string `yaml:"addresses,omitempty"`
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Routes []route `yaml:"routes,omitempty"`
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Nameservers *nameservers `yaml:"nameservers,omitempty"`
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}
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type networkDoc struct {
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Version int `yaml:"version"`
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Ethernets map[string]ethernet `yaml:"ethernets"`
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}
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func metaData(p *topology.Plan, n topology.NodePlan) ([]byte, error) {
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return yaml.Marshal(metaDoc{InstanceID: p.Name + "-" + n.Name, LocalHostname: n.Name})
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}
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func userData(p *topology.Plan, n topology.NodePlan, o Options) ([]byte, error) {
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cfg := cloudConfig{
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Hostname: n.Name,
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SSHPwauth: false,
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DisableRoot: true,
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SSHAuthorizedKeys: o.AuthorizedKeys,
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}
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switch {
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case n.Role == topology.RoleSwitch:
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cfg.Packages = []string{"nftables"}
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cfg.WriteFiles = []writeFile{
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{Path: SwitchScript, Permissions: "0755", Content: switchScript(p, n)},
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{Path: SwitchNFT, Permissions: "0644", Content: switchNFT(p, n.Name)},
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{Path: SwitchUnit, Permissions: "0644", Content: unit("Lab switch: bridges, gateways and NAT", SwitchScript)},
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}
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cfg.Runcmd = [][]string{
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{"systemctl", "daemon-reload"},
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{"systemctl", "enable", "--now", "lab-switch.service"},
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}
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case n.Loopback.IsValid():
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cfg.WriteFiles = []writeFile{
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{Path: NodeScript, Permissions: "0755", Content: "#!/bin/sh\nset -eu\n" + loopbackLines(n)},
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{Path: NodeUnit, Permissions: "0644", Content: unit("Lab node: loopback", NodeScript)},
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}
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cfg.Runcmd = [][]string{
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{"systemctl", "daemon-reload"},
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{"systemctl", "enable", "--now", "lab-node.service"},
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}
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}
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if n.FRR != "" {
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cfg.WriteFiles = append(cfg.WriteFiles,
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writeFile{Path: FRRKey, Permissions: "0644", Encoding: "b64", Content: base64.StdEncoding.EncodeToString(frrKey)},
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writeFile{Path: FRRConfig, Permissions: "0640", Content: o.FRR[n.Name]},
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writeFile{Path: FRRScript, Permissions: "0755", Content: frrScript(n)},
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)
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cfg.Runcmd = append(cfg.Runcmd, []string{FRRScript})
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}
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body, err := yaml.Marshal(cfg)
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if err != nil {
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return nil, err
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}
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return append([]byte("#cloud-config\n"), body...), nil
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}
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func frrDaemons(n topology.NodePlan) []string {
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if n.Role == topology.RoleHypervisor {
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return []string{"bgpd"}
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}
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return []string{"bgpd", "bfdd"}
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}
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func frrScript(n topology.NodePlan) string {
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var b strings.Builder
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b.WriteString("#!/bin/sh\nset -eu\nexport DEBIAN_FRONTEND=noninteractive\n. /etc/os-release\n")
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fmt.Fprintf(&b, "echo \"deb [signed-by=%s] %s ${VERSION_CODENAME} %s\" > /etc/apt/sources.list.d/frr.list\n", FRRKey, FRRRepo, FRRSuite)
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b.WriteString("n=0\nuntil apt-get update -qq --error-on=any; do\n n=$((n + 1))\n [ \"$n\" -lt 30 ] || exit 1\n sleep 10\ndone\n")
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fmt.Fprintf(&b, "apt-get install -y -qq --no-install-recommends %s\n", FRRPackages)
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for _, d := range frrDaemons(n) {
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fmt.Fprintf(&b, "sed -i 's/^%s=no/%s=yes/' /etc/frr/daemons\n", d, d)
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}
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fmt.Fprintf(&b, "install -o frr -g frr -m 0640 %s /etc/frr/frr.conf\n", FRRConfig)
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b.WriteString("systemctl restart frr\n")
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return b.String()
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}
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func loopbackLines(n topology.NodePlan) string {
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if !n.Loopback.IsValid() {
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return ""
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}
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return fmt.Sprintf("ip link add %s type dummy 2>/dev/null || true\nip addr replace %s dev %s\nip link set dev %s up\n",
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topology.LoopbackInterface, n.Loopback, topology.LoopbackInterface, topology.LoopbackInterface)
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}
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func networkConfig(p *topology.Plan, n topology.NodePlan, index int) ([]byte, error) {
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doc := networkDoc{Version: 2, Ethernets: map[string]ethernet{}}
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admin := ethernet{
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Match: match{MACAddress: adminMAC(index).String()},
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SetName: AdminInterface,
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Addresses: []string{AdminAddress},
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}
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if n.Role == topology.RoleSwitch {
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admin.Routes = []route{{To: "0.0.0.0/0", Via: AdminGateway}}
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admin.Nameservers = &nameservers{Addresses: []string{AdminDNS}}
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for _, c := range switchCables(p, n.Name) {
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doc.Ethernets[c.SwitchInterface] = ethernet{
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Match: match{MACAddress: c.SwitchMAC.String()},
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SetName: c.SwitchInterface,
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MTU: c.MTU,
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}
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}
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}
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doc.Ethernets[AdminInterface] = admin
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for i, c := range nodeCables(p, n.Name) {
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e := ethernet{
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Match: match{MACAddress: c.NodeMAC.String()},
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SetName: c.NodeInterface,
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MTU: c.MTU,
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Addresses: []string{c.NodeAddress.String()},
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}
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for _, prefix := range n.Secondary[c.Segment] {
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e.Addresses = append(e.Addresses, prefix.String())
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}
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if i == 0 {
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e.Routes = []route{{To: "0.0.0.0/0", Via: gatewayOf(p, c.Segment)}}
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e.Nameservers = &nameservers{Addresses: Nameservers}
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}
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doc.Ethernets[c.NodeInterface] = e
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}
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return yaml.Marshal(doc)
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}
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func gatewayOf(p *topology.Plan, segment string) string {
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for _, s := range p.Segments {
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if s.Name == segment {
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return s.Gateway.String()
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}
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}
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return ""
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}
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func switchScript(p *topology.Plan, n topology.NodePlan) string {
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name := n.Name
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var b strings.Builder
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b.WriteString("#!/bin/sh\nset -eu\nsysctl -qw net.ipv4.ip_forward=1\n")
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for _, s := range switchSegments(p, name) {
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fmt.Fprintf(&b, "ip link add %s type bridge stp_state 0 2>/dev/null || true\n", s.Bridge)
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for _, c := range switchCables(p, name) {
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if c.Segment != s.Name {
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continue
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}
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fmt.Fprintf(&b, "ip link set dev %s master %s\n", c.SwitchInterface, s.Bridge)
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fmt.Fprintf(&b, "ip link set dev %s up\n", c.SwitchInterface)
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}
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fmt.Fprintf(&b, "ip link set dev %s mtu %d\n", s.Bridge, s.MTU)
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fmt.Fprintf(&b, "ip addr replace %s/%d dev %s\n", s.Gateway, s.Network.Bits(), s.Bridge)
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for _, prefix := range n.Secondary[s.Name] {
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fmt.Fprintf(&b, "ip addr replace %s dev %s\n", prefix, s.Bridge)
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}
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fmt.Fprintf(&b, "ip link set dev %s up\n", s.Bridge)
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}
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b.WriteString(loopbackLines(n))
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fmt.Fprintf(&b, "nft -f %s\n", SwitchNFT)
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return b.String()
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}
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func switchNFT(p *topology.Plan, name string) string {
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var networks []string
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for _, s := range switchSegments(p, name) {
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networks = append(networks, s.Network.String())
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}
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return fmt.Sprintf(`add table ip lab_nat
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delete table ip lab_nat
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table ip lab_nat {
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chain postrouting {
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type nat hook postrouting priority srcnat; policy accept;
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ip saddr { %s } oifname "%s" masquerade
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}
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}
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`, strings.Join(networks, ", "), AdminInterface)
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}
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func unit(description, script string) string {
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return fmt.Sprintf(`[Unit]
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Description=%s
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Wants=network-online.target
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After=network-online.target
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[Service]
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Type=oneshot
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RemainAfterExit=yes
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ExecStart=%s
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[Install]
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WantedBy=multi-user.target
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`, description, script)
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}
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