forked from vtolstov/cloudmeta
/
server.go
298 lines (254 loc) · 7.16 KB
/
server.go
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package main
import (
"encoding/xml"
"errors"
"fmt"
"net"
"net/http"
"os/exec"
"reflect"
"strings"
"sync"
"syscall"
"time"
"crypto/tls"
"golang.org/x/net/ipv4"
"golang.org/x/net/ipv6"
"gopkg.in/alexzorin/libvirt-go.v2"
)
type IP struct {
Family string `xml:"family,attr"`
Address string `xml:"address,attr"`
Prefix string `xml:"prefix,attr,omitempty"`
Peer string `xml:"peer,attr,omitempty"`
Host string `xml:"host,attr,omitempty"`
Gateway string `xml:"gateway,attr,omitempty"`
}
type Storage struct {
Size string `xml:"size"`
Target string `xml:"target"`
}
type CloudConfig struct {
URL string `xml:"url,omitempty"`
}
type Network struct {
NameServer []string `xml:"nameserver,omitempty"`
DomainName string `xml:"domainname,omitempty"`
IP []IP `xml:"ip"`
}
type ISO struct {
Disks []ISODisk `xml:"disk"`
}
type ISODisk struct {
Name string `xml:"driver->name,attr"`
Type string `xml:"driver->type,attr"`
Source string `xml:"source->url,attr"`
Target string `xml:"target->name,attr"`
}
type Metadata struct {
Network Network `xml:"network"`
CloudConfig CloudConfig `xml:"cloud-config"`
ISO ISO `xml:"iso,omitempty"`
}
var httpconn net.Listener
type Server struct {
// shutdown flag
shutdown bool
// domain name
name string
// domain metadata
metadata *Metadata
// DHCPv4 conn
ipv4conn *ipv4.RawConn
// RA conn
ipv6conn *ipv6.PacketConn
// thread safe
sync.RWMutex
}
var httpTransport *http.Transport = &http.Transport{
Dial: (&net.Dialer{DualStack: true}).Dial,
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
var httpClient *http.Client = &http.Client{Transport: httpTransport, Timeout: 10 * time.Second}
func cleanExists(name string, ips []IP) []IP {
ret := make([]IP, len(ips))
copy(ret[:], ips[:])
iface, err := net.InterfaceByName("tap" + name)
if err != nil {
return ips
}
addrs, err := iface.Addrs()
if err != nil {
return ips
}
for _, addr := range addrs {
loop:
for i, ip := range ret {
if ip.Address+"/"+ip.Prefix == addr.String() {
copy(ret[i:], ret[i+1:])
ret[len(ret)-1] = IP{}
ret = ret[:len(ret)-1]
break loop
}
}
}
return ret
}
var servers map[string]*Server
func init() {
servers = make(map[string]*Server, 1024)
}
func (s *Server) Start() error {
var buf string
var err error
var domain libvirt.VirDomain
if s.name == "" {
return errors.New("invalid server config")
}
s.Lock()
defer s.Unlock()
virconn = getVirConn()
domain, err = virconn.LookupDomainByName(s.name)
if err != nil {
l.Info("failed to lookup to libvirt: " + err.Error())
return err
}
defer domain.Free()
buf, err = domain.GetMetadata(libvirt.VIR_DOMAIN_METADATA_ELEMENT, "http://simplecloud.ru/", libvirt.VIR_DOMAIN_MEM_LIVE)
if err != nil {
l.Info("failed to get metadata from libvirt: " + err.Error())
return err
}
s.metadata = &Metadata{}
if err = xml.Unmarshal([]byte(buf), s.metadata); err != nil {
l.Info("failed to get unmarshal xml from libvirt: " + err.Error())
return err
}
if len(s.metadata.Network.NameServer) == 0 {
s.metadata.Network.NameServer = []string{"8.8.8.8"}
}
if s.metadata.Network.DomainName == "" {
s.metadata.Network.DomainName = "simplecloud.club"
}
iface, err := net.InterfaceByName(master_iface)
if err != nil {
l.Info("failed to get data from master_iface: " + err.Error())
return err
}
addrs, err := iface.Addrs()
if err != nil {
l.Info("failed to get ifaces: " + err.Error())
return err
}
var peer string
for _, addr := range addrs {
a := strings.Split(addr.String(), "/")[0]
ip := net.ParseIP(a)
if ip == nil {
continue
}
if ip.To4() != nil {
peer = ip.String()
}
}
l.Info(fmt.Sprintf("add commands"))
var cmds []*exec.Cmd
for _, addr := range s.metadata.Network.IP {
if addr.Family == "ipv4" && addr.Host == "true" && addr.Peer != "" {
cmds = append(cmds, exec.Command("ipset", "-!", "add", "prevent_spoofing", addr.Address+"/"+addr.Prefix+","+"tap"+s.name))
}
if addr.Family == "ipv6" && addr.Host == "false" {
cmds = append(cmds, exec.Command("ipset", "-!", "add", "prevent6_spoofing", addr.Address+","+"tap"+s.name))
}
}
metaIP := cleanExists(s.name, s.metadata.Network.IP)
for _, addr := range metaIP {
if addr.Family == "ipv4" && addr.Host == "true" {
// TODO: use netlink
if addr.Peer != "" {
cmds = append(cmds, exec.Command("ip", "-4", "a", "add", peer, "peer", addr.Address+"/"+addr.Prefix, "dev", "tap"+s.name))
} else {
cmds = append(cmds, exec.Command("ip", "-4", "a", "add", addr.Address+"/"+addr.Prefix, "dev", "tap"+s.name))
}
}
}
cmds = append(cmds, exec.Command("sysctl", "-w", "net.ipv4.conf.tap"+s.name+".proxy_arp=1"))
for _, addr := range metaIP {
if addr.Family == "ipv6" && addr.Host == "true" {
// TODO: use netlink
cmds = append(cmds, exec.Command("ip", "-6", "a", "add", addr.Address+"/"+addr.Prefix, "dev", "tap"+s.name))
cmds = append(cmds, exec.Command("ip", "-6", "r", "replace", addr.Address+"/"+addr.Prefix, "dev", "tap"+s.name, "proto", "static", "table", "200"))
}
}
l.Info(fmt.Sprintf("run commands"))
for _, cmd := range cmds {
l.Info(fmt.Sprintf("exec %s", cmd))
err = cmd.Run()
if err != nil {
l.Info(fmt.Sprintf("Failed to run cmd %s: %s", cmd, err))
return fmt.Errorf("Failed to run cmd %s: %s", cmd, err)
}
}
l.Info(s.name + " ListenAndServeUDPv4")
go s.ListenAndServeUDPv4()
l.Info(s.name + " ListenAndServeICMPv6")
go s.ListenAndServeICMPv6()
return nil
}
func (s *Server) Stop() (err error) {
s.Lock()
defer s.Unlock()
if s == nil {
return nil
}
s.shutdown = true
time.Sleep(2 * time.Second)
l.Info(fmt.Sprintf("shutdown ipv4 conn"))
if s.ipv4conn != nil {
s.ipv4conn.Close()
}
l.Info(fmt.Sprintf("shutdown ipv6 conn"))
if s.ipv6conn != nil {
s.ipv6conn.Close()
}
var cmds []*exec.Cmd
if s.metadata != nil && len(s.metadata.Network.IP) > 0 {
l.Info(fmt.Sprintf("add commands"))
for _, addr := range s.metadata.Network.IP {
if addr.Family == "ipv4" && addr.Host == "true" {
// TODO: use netlink
if addr.Peer != "" {
cmds = append(cmds, exec.Command("ipset", "-!", "del", "prevent_spoofing", addr.Address+"/"+addr.Prefix+","+"tap"+s.name))
}
}
}
for _, addr := range s.metadata.Network.IP {
if addr.Family == "ipv6" && addr.Host == "true" {
// TODO: use netlink
cmds = append(cmds, exec.Command("ipset", "-!", "del", "prevent6_spoofing", addr.Address+"/"+addr.Prefix+","+"tap"+s.name))
}
}
l.Info(fmt.Sprintf("run commands"))
for _, cmd := range cmds {
l.Info(fmt.Sprintf("exec %s", cmd))
err = cmd.Run()
if err != nil {
l.Info(fmt.Sprintf("Failed to run cmd %s: %s", cmd, err))
return fmt.Errorf("Failed to run cmd %s: %s", cmd, err)
}
}
}
s.metadata = nil
return nil
}
func bindToDevice(conn net.PacketConn, device string) error {
ptrVal := reflect.ValueOf(conn)
val := reflect.Indirect(ptrVal)
//next line will get you the net.netFD
fdmember := val.FieldByName("fd")
val1 := reflect.Indirect(fdmember)
netFdPtr := val1.FieldByName("sysfd")
fd := int(netFdPtr.Int())
//fd now has the actual fd for the socket
return syscall.SetsockoptString(fd, syscall.SOL_SOCKET, syscall.SO_BINDTODEVICE, device)
}