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9ae20db92e
107
main.go
Normal file
107
main.go
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@ -0,0 +1,107 @@
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package main
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import (
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"container/ring"
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"fmt"
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"github.com/hpcloud/tail"
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"encoding/json"
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"net/http"
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"os"
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"regexp"
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"strconv"
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"strings"
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"time"
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)
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func fileHandler(w http.ResponseWriter, r *http.Request, s string) {
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fn := r.URL.Path[5:len(r.URL.Path)]
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for _, v := range whitelist {
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if !strings.Contains(v, fn) {
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sendFile(w, fn, "", "Permission denied")
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return
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}
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}
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if _, err := os.Stat(fn); err != nil {
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sendFile(w, fn, "", "No such file or directory")
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return
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}
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if (watch == false) {
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t, err := tail.TailFile(fn, tail.Config{Follow: false})
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watch = true
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}
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if (err == nil) {
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fmt.Println(err)
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}
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var m = ""
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w.WriteHeader(http.StatusOK)
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for line := range t.Lines {
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m += fmt.Sprintf("%s\n", line.Text)
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logring.Value = line.Text
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logring = logring.Next()
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}
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if m != m_prev {
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sendFile(w, fn, m, "")
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m_prev = m
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}
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}
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func sendFile(w http.ResponseWriter, fn string, m string, err string) {
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json.NewEncoder(w).Encode(map[string]string{"time": strconv.FormatInt(t_ms(), 16), "Filename": fn, "Text": m, "error": err})
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}
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func t_ms() (int64) {
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now := time.Now()
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ns := now.UnixNano()
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ms := ns / 1000000
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return ms
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}
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func makeHandler(fn func(http.ResponseWriter, *http.Request, string)) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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m := validPath.FindStringSubmatch(r.URL.Path)
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if m == nil {
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http.NotFound(w, r)
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return
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}
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fmt.Println("makeHandler::request::" + r.RequestURI)
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fn(w, r, m[2])
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}
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}
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var prj = "httptail"
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var version = "0.1.0"
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var server_inet6 = "[fdef:c181:4234:7978:6::1]:8080"
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var whitelist = map[int]string{
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0: "/var/log",
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}
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var logring = ring.New(1000)
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var validPath = regexp.MustCompile("^/(tail*|auth)/(.*)$")
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var watch bool = false
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var m_prev = ""
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func main() {
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uid := os.Getuid()
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t.Filename = ""
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if (uid == -1) {
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fmt.Println("Windows is unsupported")
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}
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if (uid == 0) {
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fmt.Println("Refusing to run as root")
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return
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}
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http.HandleFunc("/tail/", makeHandler(fileHandler))
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fmt.Println("Serving " + prj + " " + version + " on " + server_inet6)
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http.ListenAndServe(server_inet6, nil)
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t.Cleanup()
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}
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