/
server.go
432 lines (377 loc) · 10 KB
/
server.go
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package restful
import (
"bufio"
"crypto/tls"
"fmt"
"io"
"net"
"net/http"
"os"
"strconv"
"strings"
"syscall"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/pkg/listenbuffer"
"github.com/docker/docker/pkg/sockets"
"github.com/gorilla/mux"
systemdActivation "github.com/coreos/go-systemd/activation"
systemdDaemon "github.com/coreos/go-systemd/daemon"
)
type Server struct {
cfg *Config
router *mux.Router
start chan struct{}
servers []serverCloser
}
func NewServer(cfg *Config) *Server {
srv := &Server{
cfg: cfg,
start: make(chan struct{}, 1),
}
return srv
}
type ServFunc func(w http.ResponseWriter, r *http.Request, vars map[string]string, body io.ReadCloser) (int, interface{}, error)
// Prepare loops through all of the protocols sent in to spawns
// off a go routine to setup a serving http.Server for each.
func (s *Server) Prepare(protoAddrs []string, m map[string]map[string]ServFunc) error {
s.createRouter(m, s.cfg)
var chErrors = make(chan error, len(protoAddrs))
for _, protoAddr := range protoAddrs {
protoAddrParts := strings.SplitN(protoAddr, "://", 2)
if len(protoAddrParts) != 2 {
return fmt.Errorf("bad format, expected PROTO://ADDR")
}
srvs, err := s.newServer(protoAddrParts[0], protoAddrParts[1])
if err != nil {
return err
}
s.servers = append(s.servers, srvs...)
for _, srv := range srvs {
logrus.Infof("Listening for HTTP on %s (%s)", protoAddrParts[0], protoAddrParts[1])
go func(v serverCloser) {
if err := v.Serve(); err != nil && strings.Contains(err.Error(), "use of closed network connection") {
err = nil
}
chErrors <- err
}(srv)
}
}
for i := 0; i < len(protoAddrs); i++ {
err := <-chErrors
if err != nil {
return err
}
}
return nil
}
func (s *Server) AcceptConnections() {
go systemdDaemon.SdNotify("READY=1")
// close the lock so the listeners start accepting connections
select {
case <-s.start:
default:
close(s.start)
}
}
func (s *Server) Close() {
for _, srv := range s.servers {
if err := srv.Close(); err != nil {
logrus.Error(err)
}
}
}
type serverCloser interface {
Serve() error
Close() error
}
type httpServer struct {
srv *http.Server
l net.Listener
}
func (s *httpServer) Serve() error {
return s.srv.Serve(s.l)
}
func (s *httpServer) Close() error {
return s.l.Close()
}
func (s *Server) createRouter(m map[string]map[string]ServFunc, cfg *Config) {
s.router = mux.NewRouter()
// If "api-cors-header" is not given, but "api-enable-cors" is true, we set cors to "*"
// otherwise, all head values will be passed to HTTP handler
corsHeaders := cfg.CorsHeaders
if corsHeaders == "" && cfg.EnableCors {
corsHeaders = "*"
}
for method, routes := range m {
for route, fct := range routes {
logrus.Debugf("Registering %s, %s", method, route)
// NOTE: scope issue, make sure the variables are local and won't be changed
localRoute := route
localFct := fct
localMethod := method
// build the handler function
f := makeHTTPHandler(cfg.Logging, localMethod, localRoute, localFct, corsHeaders)
// add the new route
if localRoute == "" {
s.router.Methods(localMethod).HandlerFunc(f)
} else {
s.router.Path("/v{version:[0-9.]+}" + localRoute).Methods(localMethod).HandlerFunc(f)
s.router.Path(localRoute).Methods(localMethod).HandlerFunc(f)
}
}
}
return
}
func makeHTTPHandler(logging bool, localMethod string, localRoute string, handlerFunc ServFunc, corsHeaders string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
// log the request
logrus.Debugf("Calling %s %s", localMethod, localRoute)
if logging {
logrus.Infof("%s %s", r.Method, r.RequestURI)
}
if corsHeaders != "" {
writeCorsHeaders(w, r, corsHeaders)
}
switch localMethod {
case "POST", "DELETE":
parseMultipartForm(r)
}
// If contentLength is -1, we can assumed chunked encoding
// or more technically that the length is unknown
// https://golang.org/src/pkg/net/http/request.go#L139
// net/http otherwise seems to swallow any headers related to chunked encoding
// including r.TransferEncoding
// allow a nil body for backwards compatibility
var body io.ReadCloser
if r.Body != nil && (r.ContentLength > 0 || r.ContentLength == -1) {
if err := checkForJSON(r); err != nil {
// post body must be json
logrus.Errorf("checkForJSON returned error: %s", err)
httpError(w, err)
return
}
body = r.Body
}
st, out, err := handlerFunc(w, r, mux.Vars(r), body)
if err != nil {
logrus.Errorf("Handler for %s %s returned error: %s", localMethod, localRoute, err)
httpError(w, err)
}
switch {
case out != nil:
writeJSON(w, st, out)
case st != 0:
w.WriteHeader(st)
}
}
}
func (s *Server) initTCPSocket(addr string) (l net.Listener, err error) {
if s.cfg.TLSConfig == nil || s.cfg.TLSConfig.ClientAuth != tls.RequireAndVerifyClientCert {
logrus.Warn("/!\\ DON'T BIND ON ANY IP ADDRESS WITHOUT setting -tlsverify IF YOU DON'T KNOW WHAT YOU'RE DOING /!\\")
}
if l, err = sockets.NewTCPSocket(addr, s.cfg.TLSConfig, s.start); err != nil {
return nil, err
}
return
}
// TODO: mutil-platform support
// newServer sets up the required serverClosers and does protocol specific checking.
func (s *Server) newServer(proto, addr string) ([]serverCloser, error) {
var (
err error
ls []net.Listener
)
switch proto {
case "fd":
ls, err = listenFD(addr)
if err != nil {
return nil, err
}
// We don't want to start serving on these sockets until the
// daemon is initialized and installed. Otherwise required handlers
// won't be ready.
<-s.start
case "tcp":
l, err := s.initTCPSocket(addr)
if err != nil {
return nil, err
}
ls = append(ls, l)
case "unix":
l, err := newUnixSocket(addr, s.cfg.SocketGroup, s.start)
if err != nil {
return nil, err
}
ls = append(ls, l)
default:
return nil, fmt.Errorf("Invalid protocol format: %q", proto)
}
var res []serverCloser
for _, l := range ls {
res = append(res, &httpServer{
&http.Server{
Addr: addr,
Handler: s.router,
},
l,
})
}
return res, nil
}
func newUnixSocket(path, group string, activate <-chan struct{}) (net.Listener, error) {
if err := syscall.Unlink(path); err != nil && !os.IsNotExist(err) {
return nil, err
}
mask := syscall.Umask(0777)
defer syscall.Umask(mask)
l, err := listenbuffer.NewListenBuffer("unix", path, activate)
if err != nil {
return nil, err
}
if err := setSocketGroup(path, group); err != nil {
l.Close()
return nil, err
}
if err := os.Chmod(path, 0660); err != nil {
l.Close()
return nil, err
}
return l, nil
}
func setSocketGroup(path, group string) error {
if group == "" {
return nil
}
if err := changeGroup(path, group); err != nil {
logrus.Debugf("Warning: could not change group %s to %v: %v", path, group, err)
}
return nil
}
func changeGroup(path string, nameOrGid string) error {
gid, err := lookupGidByName(nameOrGid)
if err != nil {
return err
}
logrus.Debugf("%s group found. gid: %d", nameOrGid, gid)
return os.Chown(path, 0, gid)
}
func lookupGidByName(nameOrGid string) (int, error) {
groupFile := "/etc/group"
groups, err := parseGroupFileFilter(groupFile, func(g userGroup) bool {
return g.Name == nameOrGid || strconv.Itoa(g.Gid) == nameOrGid
})
if err != nil {
return -1, err
}
if groups != nil && len(groups) > 0 {
return groups[0].Gid, nil
}
gid, err := strconv.Atoi(nameOrGid)
if err == nil {
logrus.Warnf("Could not find GID %d", gid)
return gid, nil
}
return -1, fmt.Errorf("Group %s not found", nameOrGid)
}
type userGroup struct {
Name string
Pass string
Gid int
List []string
}
func parseGroupFileFilter(path string, filter func(userGroup) bool) ([]userGroup, error) {
group, err := os.Open(path)
if err != nil {
return nil, err
}
defer group.Close()
return parseGroupFilter(group, filter)
}
func parseGroupFilter(r io.Reader, filter func(userGroup) bool) ([]userGroup, error) {
if r == nil {
return nil, fmt.Errorf("nil source for group-formatted data")
}
var (
s = bufio.NewScanner(r)
out = []userGroup{}
)
for s.Scan() {
if err := s.Err(); err != nil {
return nil, err
}
text := s.Text()
if text == "" {
continue
}
// see: man 5 group
// group_name:password:GID:user_list
// Name:Pass:Gid:List
// root:x:0:root
// adm:x:4:root,adm,daemon
p := userGroup{}
parseLine(
text,
&p.Name, &p.Pass, &p.Gid, &p.List,
)
if filter == nil || filter(p) {
out = append(out, p)
}
}
return out, nil
}
func parseLine(line string, v ...interface{}) {
if line == "" {
return
}
parts := strings.Split(line, ":")
for i, p := range parts {
if len(v) <= i {
// if we have more "parts" than we have places to put them, bail for great "tolerance" of naughty configuration files
break
}
switch e := v[i].(type) {
case *string:
// "root", "adm", "/bin/bash"
*e = p
case *int:
// "0", "4", "1000"
// ignore string to int conversion errors, for great "tolerance" of naughty configuration files
*e, _ = strconv.Atoi(p)
case *[]string:
// "", "root", "root,adm,daemon"
if p != "" {
*e = strings.Split(p, ",")
} else {
*e = []string{}
}
default:
// panic, because this is a programming/logic error, not a runtime one
panic("parseLine expects only pointers! argument " + strconv.Itoa(i) + " is not a pointer!")
}
}
}
// listenFD returns the specified socket activated files as a slice of
// net.Listeners or all of the activated files if "*" is given.
func listenFD(addr string) ([]net.Listener, error) {
// socket activation
listeners, err := systemdActivation.Listeners(false)
if err != nil {
return nil, err
}
if listeners == nil || len(listeners) == 0 {
return nil, fmt.Errorf("No sockets found")
}
// default to all fds just like unix:// and tcp://
if addr == "" {
addr = "*"
}
fdNum, _ := strconv.Atoi(addr)
fdOffset := fdNum - 3
if (addr != "*") && (len(listeners) < int(fdOffset)+1) {
return nil, fmt.Errorf("Too few socket activated files passed in")
}
if addr == "*" {
return listeners, nil
}
return []net.Listener{listeners[fdOffset]}, nil
}