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package libwebsocketd
import (
"errors"
"fmt"
"net"
"net/http"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/gorilla/websocket"
)
var ScriptNotFoundError = errors.New("script not found")
// WebsocketdHandler is a single request information and processing structure, it handles WS requests out of all that daemon can handle (static, cgi, devconsole)
type WebsocketdHandler struct {
server *WebsocketdServer
Id string
*RemoteInfo
*URLInfo // TODO: I cannot find where it's used except in one single place as URLInfo.FilePath
Env []string
command string
}
// NewWebsocketdHandler constructs the struct and parses all required things in it...
func NewWebsocketdHandler(s *WebsocketdServer, req *http.Request, log *LogScope) (wsh *WebsocketdHandler, err error) {
wsh = &WebsocketdHandler{server: s, Id: generateId()}
log.Associate("id", wsh.Id)
wsh.RemoteInfo, err = GetRemoteInfo(req.RemoteAddr, s.Config.ReverseLookup)
if err != nil {
log.Error("session", "Could not understand remote address '%s': %s", req.RemoteAddr, err)
return nil, err
}
log.Associate("remote", wsh.RemoteInfo.Host)
wsh.URLInfo, err = GetURLInfo(req.URL.Path, s.Config)
if err != nil {
log.Access("session", "NOT FOUND: %s", err)
return nil, err
}
wsh.command = s.Config.CommandName
if s.Config.UsingScriptDir {
wsh.command = wsh.URLInfo.FilePath
}
log.Associate("command", wsh.command)
wsh.Env = createEnv(wsh, req, log)
return wsh, nil
}
func (wsh *WebsocketdHandler) accept(ws *websocket.Conn, log *LogScope) {
defer ws.Close()
log.Access("session", "CONNECT")
defer log.Access("session", "DISCONNECT")
launched, err := launchCmd(wsh.command, wsh.server.Config.CommandArgs, wsh.Env)
if err != nil {
log.Error("process", "Could not launch process %s %s (%s)", wsh.command, strings.Join(wsh.server.Config.CommandArgs, " "), err)
return
}
log.Associate("pid", strconv.Itoa(launched.cmd.Process.Pid))
binary := wsh.server.Config.Binary
process := NewProcessEndpoint(launched, binary, log)
if cms := wsh.server.Config.CloseMs; cms != 0 {
process.closetime += time.Duration(cms) * time.Millisecond
}
wsEndpoint := NewWebSocketEndpoint(ws, binary, log)
PipeEndpoints(process, wsEndpoint)
}
// RemoteInfo holds information about remote http client
type RemoteInfo struct {
Addr, Host, Port string
}
// GetRemoteInfo creates RemoteInfo structure and fills its fields appropriately
func GetRemoteInfo(remote string, doLookup bool) (*RemoteInfo, error) {
addr, port, err := net.SplitHostPort(remote)
if err != nil {
return nil, err
}
var host string
if doLookup {
hosts, err := net.LookupAddr(addr)
if err != nil || len(hosts) == 0 {
host = addr
} else {
host = hosts[0]
}
} else {
host = addr
}
return &RemoteInfo{Addr: addr, Host: host, Port: port}, nil
}
// URLInfo - structure carrying information about current request and it's mapping to filesystem
type URLInfo struct {
ScriptPath string
PathInfo string
FilePath string
}
// GetURLInfo is a function that parses path and provides URL info according to libwebsocketd.Config fields
func GetURLInfo(path string, config *Config) (*URLInfo, error) {
if !config.UsingScriptDir {
return &URLInfo{"/", path, ""}, nil
}
parts := strings.Split(path[1:], "/")
urlInfo := &URLInfo{}
for i, part := range parts {
urlInfo.ScriptPath = strings.Join([]string{urlInfo.ScriptPath, part}, "/")
urlInfo.FilePath = filepath.Join(config.ScriptDir, urlInfo.ScriptPath)
isLastPart := i == len(parts)-1
statInfo, err := os.Stat(urlInfo.FilePath)
// not a valid path
if err != nil {
return nil, ScriptNotFoundError
}
// at the end of url but is a dir
if isLastPart && statInfo.IsDir() {
return nil, ScriptNotFoundError
}
// we've hit a dir, carry on looking
if statInfo.IsDir() {
continue
}
// no extra args
if isLastPart {
return urlInfo, nil
}
// build path info from extra parts of url
urlInfo.PathInfo = "/" + strings.Join(parts[i+1:], "/")
return urlInfo, nil
}
panic(fmt.Sprintf("GetURLInfo cannot parse path %#v", path))
}
func generateId() string {
return strconv.FormatInt(time.Now().UnixNano(), 10)
}
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