signed-commit remote shell (see also https://github.com/dyne/scorsh)
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90 lines
2.1 KiB
90 lines
2.1 KiB
package main
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import (
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"fmt"
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"github.com/fsnotify/fsnotify"
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"gopkg.in/yaml.v2"
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"io/ioutil"
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"log"
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"os"
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// "time"
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)
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// parse a request file and return a SCORSHmessage
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func parseRequest(fname string, msg *SCORSHmsg) error {
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debug.log("[parseRequest] message at start: %s\n", msg)
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data, err := ioutil.ReadFile(fname)
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if err != nil {
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log.Printf("Unable to open file: %s\n", fname)
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return SCORSHerr(SCORSH_ERR_NO_FILE)
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}
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debug.log("[parseRequest] file contains: \n%s\n", data)
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debug.log("[parseRequest] reading message from file: %s\n", fname)
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err = yaml.Unmarshal([]byte(data), msg)
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if err != nil {
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return fmt.Errorf("Error parsing message: %s", err)
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}
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debug.log("[parseRequest] got message: %s\n", msg)
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return nil
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}
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func spooler(watcher *fsnotify.Watcher, master chan SCORSHmsg) {
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log.Println("Spooler started correctly")
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for {
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select {
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case event := <-watcher.Events:
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// Here we manage genuine events from fsnotify. We catch the
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// "Write" event, which should happen only when the file is
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// created
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if event.Op == fsnotify.Write {
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var msg SCORSHmsg
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debug.log("[spooler] new file %s detected\n", event.Name)
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err := parseRequest(event.Name, &msg)
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if err != nil {
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log.Printf("Invalid packet received. [%s]\n", err)
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}
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debug.log("[spooler] read message: %s\n", msg)
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msg.Path = event.Name
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master <- msg
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}
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case err := <-watcher.Errors:
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// here we manage event errors
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log.Println("[spooler] error: ", err)
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case msg := <-master:
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// Here we receive messages from the master about files to be
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// removed
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log.Printf("[spooler] received deletion request for: %s\n", msg.Path)
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err := os.Remove(msg.Path)
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if err != nil {
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log.Printf("[spooler] error removing file: %s\n", err)
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} else {
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log.Printf("[spooler] file %s successfully removed\n", msg.Path)
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}
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}
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}
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}
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func startSpooler(master *SCORSHmaster) error {
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watcher, err := fsnotify.NewWatcher()
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if err != nil {
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return fmt.Errorf("error creating watcher: %s", err)
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}
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err = watcher.Add(master.Spooldir)
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if err != nil {
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return fmt.Errorf("error adding folder: %s", err)
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}
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go spooler(watcher, master.Spooler)
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return nil
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}
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