listen address configurable

  * new flag: '-l' to configure the address where the
    webserver listens

  * example - to listen on 192.168.1.20:5555:

       zfs-snap-diff -l 192.168.1.20 -p 5555

  * i keep the '-a' flag for backward compatibility

Author: j-keck

README.md

@@ -9,24 +9,25 @@ _Next features of `zfs-snap-diff`: [feature poll](https://github.com/j-keck/zfs-
 With `zfs-snap-diff` you can explore file differences and restore changes from older file versions in different zfs snapshots.
 You can restore the whole file from a older version, or select single changes to revert in the 'Diff' view.
 
-  
+
 `zfs-snap-diff` has a web frontend, so it can run on your local work machine or on your remote file / backup server (no Xserver necesarry).
 
 To keep it protable and independent, it's made as a single executable with all html / js stuff included.
 The backend is implemented in golang, the frontend with [angularjs](https://angularjs.org), [bootstrap](http://getbootstrap.com) and [highlight.js](https://github.com/isagalaev/highlight.js).
 
 
-  
+
 ##Usage
 _under linux, you need the '-use-sudo' flag if you don't run it as root - see the options below_
 
 ### Startup a server instance
 
       ./zfs-snap-diff [OPT_ARGS] <ZFS_NAME>
-  
+
   * starts a web server on port http://127.0.0.1:12345
   * optional arguments:
     * -a: listen on all interfaces (default: listen only on localhost)
+    * -l: listen on the given address (default: 127.0.0.1)
     * -p: web server port (default: 12345)
     * -default-file-action: file action when a file is selected (default: view):
       * off: no action
@@ -49,7 +50,7 @@ _under linux, you need the '-use-sudo' flag if you don't run it as root - see th
       * adjust sudo rules (see [doc/etc/sudoers.d/zfs-snap-diff](https://github.com/j-keck/zfs-snap-diff/blob/master/doc/etc/sudoers.d/zfs-snap-diff))
 
 
-  
+
 
 ### Connect with your web browser
 
@@ -59,29 +60,29 @@ _under linux, you need the '-use-sudo' flag if you don't run it as root - see th
 
 ## User guide
 
-### Browse actual filesystem state 
+### Browse actual filesystem state
 
 #### Select a dataset
 
 Select a dataset which you would explore. If you start `zfs-snap-diff` on a dataset with no childrens, the current dataset are selected.
 
 ![Datasets](doc/zsd-ba-datasets.png)
 
-  
+
 #### Search a file
-  
+
 Search a file to compare in the file browser.
-    
+
 ![File browser](doc/zsd-ba-file-browser.png)
 
 
-   
+
 #### Select a file
 
 When a file is selected, `zsd-snap-diff` search all snapshots where the selected file was modified (it compares text files per md5, others per size+modTime).
-    
+
 ![File selected](doc/zsd-ba-snapshots.png)
-  
+
 
 #### Select a snapshot
 
@@ -94,10 +95,10 @@ View the file content from an older file version.
 ###### Diff
 Explore file differences and pick single changes to revert.
 
-intext diff:  
+intext diff:
 ![intext diff](doc/zsd-ba-diff-intext.png)
 
-  
+
 side by side diff:
 ![side by side diff](doc/zsd-ba-diff-side-by-side.png)
 
@@ -108,7 +109,7 @@ side by side diff:
 #### Search a snaphot
 
 Search a snapshot in the snapshot browser. All snapshots from the selected dataset are displayed in this view.
-  
+
 ![Snapshot Browser](doc/zsd-bs-snapshots.png)
 
 
@@ -118,23 +119,23 @@ When a snapshot is selected, the file-browser shows the content from this snapsh
 
 ![File Browser](doc/zsd-bs-file-browser.png)
 
-  
+
 From here you can easy view / restore a deleted file.
-  
+
 ![File View](doc/zsd-bs-file-selected.png)
 
 
- 
+
 
 
 ## Installation
-  
+
 ### Prebuild
 
   Get a package for your platform from: https://github.com/j-keck/zfs-snap-diff/releases/latest
 
  *ping me if your platform is missing*
-    
+
 ### Manual build
 
   * clone the repository
@@ -168,11 +169,11 @@ From here you can easy view / restore a deleted file.
 
         zfs allow -u <USER_NAME> diff <ZFS_NAME>
 
-   
+
 
 ## Coding Notes
 
-  * if you change something under 'webapp/' 
+  * if you change something under 'webapp/'
 
     * start `zfs-snap-diff` per `./build.pl webdev <ZFS_NAME>`
       to serve the static content from the `webapp` folder
@@ -198,59 +199,59 @@ From here you can easy view / restore a deleted file.
   * add size informations to dataset (to match 'zfs list' output)
   * small fixes
   * code cleanup
-  
+
 [all commits from 0.0.7...0.0.8](https://github.com/j-keck/zfs-snap-diff/compare/0.0.7...0.0.8)
-  
+
 0.0.7:
   * support sub zfs filesystems (datasets)
   * optional use sudo when execute zfs commands
     * necessary under linux when running as non root
     * needs sudo rules (see [doc/etc/sudoers.d/zfs-snap-diff](https://github.com/j-keck/zfs-snap-diff/blob/master/doc/etc/sudoers.d/zfs-snap-diff))
     * start `zfs-snap-diff` with '-use-sudo'
   * new view for server messages
-  
+
 [all commits from 0.0.6...0.0.7](https://github.com/j-keck/zfs-snap-diff/compare/0.0.6...0.0.7)
-  
+
 0.0.6:
   * check if file in snapshot has changed filetype depend:
     * text files: md5
     * others: size+modTime
   * diffs created in the backend (per [go-diff](https://github.com/sergi/go-diff))
     * different presentation: intext / side by side
     * possibility to revert single changes
-  
-[all commits from 0.0.5...0.0.6](https://github.com/j-keck/zfs-snap-diff/compare/0.0.5...0.0.6)  
-   
-  
+
+[all commits from 0.0.5...0.0.6](https://github.com/j-keck/zfs-snap-diff/compare/0.0.5...0.0.6)
+
+
 0.0.5:
   * file compare method configurable: size+modTime (default) or md5
   * optional limit how many snapshots are scan to search older file version
   * autohide notifications in frontend
   * show message if no snapshots found
-  
-[all commits from 0.0.4...0.0.5](https://github.com/j-keck/zfs-snap-diff/compare/0.0.4...0.0.5)  
-  
+
+[all commits from 0.0.4...0.0.5](https://github.com/j-keck/zfs-snap-diff/compare/0.0.4...0.0.5)
+
 0.0.4:
   * view, diff, download or restore file from a snapshot
   * view file with syntax highlight
   * browse old snapshot versions
   * easy switch "versions" per 'Older' / 'Newer' buttons
   * cleanup frontend
   * refactor backend
-  
-[all commits 0.0.3...0.0.4](https://github.com/j-keck/zfs-snap-diff/compare/0.0.3...0.0.4)    
-  
+
+[all commits 0.0.3...0.0.4](https://github.com/j-keck/zfs-snap-diff/compare/0.0.3...0.0.4)
+
 0.0.3:
   * show server errors on frontend
   * show waiting spinner when loading
 
-[all commits 0.0.2...0.0.3](https://github.com/j-keck/zfs-snap-diff/compare/0.0.2...0.0.3)        
-  
+[all commits 0.0.2...0.0.3](https://github.com/j-keck/zfs-snap-diff/compare/0.0.2...0.0.3)
+
 0.0.2 :
   * partial frontend configuration from server
   * fix firefox ui
 
-[all commits 0.0.1...0.0.2](https://github.com/j-keck/zfs-snap-diff/compare/0.0.1...0.0.2)      
+[all commits 0.0.1...0.0.2](https://github.com/j-keck/zfs-snap-diff/compare/0.0.1...0.0.2)
 
 0.0.1:
-  * prototype  
+  * prototype

main.go

@@ -25,6 +25,7 @@ var (
 )
 
 type webServerConfig struct {
+	addr     string
 	useTLS   bool
 	certFile string
 	keyFile  string
@@ -40,6 +41,7 @@ func main() {
 	}
 
 	// define flags / parse flags
+	addrFlag := flag.String("l", "127.0.0.1", "web server listen address")
 	portFlag := flag.Int("p", 12345, "web server port")
 	useTLSFlag := flag.Bool("tls", false, "use TLS - NOTE: -cert <CERT_FILE> -key <KEY_FILE> are mandatory")
 	certFileFlag := flag.String("cert", "", "certificate file for TLS")
@@ -69,6 +71,7 @@ func main() {
 	} else {
 		initLogHandlers(ioutil.Discard, os.Stdout, os.Stdout, os.Stdout, os.Stderr)
 	}
+	logDebug.Printf("zfs-snap-diff version: %s\n", VERSION)
 
 	// last argument is the zfs name
 	zfsName := flag.Arg(0)
@@ -98,7 +101,6 @@ func main() {
 			os.Exit(1)
 		}
 	}
-	webServerCfg := webServerConfig{*useTLSFlag, *certFileFlag, *keyFileFlag}
 
 	// initialize zfs handler
 	var err error
@@ -109,7 +111,7 @@ func main() {
 	}
 	logInfo.Printf("work on zfs: %s which is mounted under: %s\n", zfs.Datasets.Root().Name, zfs.Datasets.Root().MountPoint)
 
-	// listen on localhost - if flag '-a' is given, listen on all interfaces
+	// listen on the given address - or if flag '-a' is given, listen on all interfaces
 	var addr string
 	if *listenOnAllInterfacesFlag {
 		fmt.Println("")
@@ -120,9 +122,9 @@ func main() {
 			fmt.Println("\nHINT: USE -tls -cert <CERT_FILE> -key <KEY_FILE> to enable encryption!")
 		}
 		fmt.Println("")
-		addr = fmt.Sprintf(":%d", *portFlag)
+		addr = fmt.Sprintf("0.0.0.0:%d", *portFlag)
 	} else {
-		addr = fmt.Sprintf("127.0.0.1:%d", *portFlag)
+		addr = fmt.Sprintf("%s:%d", *addrFlag, *portFlag)
 	}
 
 	// print warning if file-compare method md5 is used
@@ -134,6 +136,14 @@ func main() {
 		}
 	}
 
+	// webserver config
+	webServerCfg := webServerConfig{
+		addr:     addr,
+		useTLS:   *useTLSFlag,
+		certFile: *certFileFlag,
+		keyFile:  *keyFileFlag,
+	}
+
 	// frontend-config
 	frontendCfg := frontendConfig{
 		"diffContextSize":   *diffContextSizeFlag,
@@ -147,7 +157,7 @@ func main() {
 	}
 
 	// startup web server
-	listenAndServe(addr, webServerCfg, frontendCfg)
+	listenAndServe(webServerCfg, frontendCfg)
 }
 
 func initLogHandlers(debugHndl, infoHndl, noticeHndl, warnHndl, errorHndl io.Writer) {

web.go

@@ -19,7 +19,7 @@ var mimeTypes = map[string]string{
 }
 
 // registers response handlers and starts the web server
-func listenAndServe(addr string, webServerCfg webServerConfig, frontendCfg frontendConfig) {
+func listenAndServe(webServerCfg webServerConfig, frontendCfg frontendConfig) {
 	http.HandleFunc("/config", configHndl(frontendCfg))
 	http.HandleFunc("/snapshots-for-dataset", snapshotsForDatasetHndl)
 	http.HandleFunc("/snapshots-for-file", snapshotsForFileHndl)
@@ -39,12 +39,13 @@ func listenAndServe(addr string, webServerCfg webServerConfig, frontendCfg front
 		http.HandleFunc("/", serveStaticContentFromBinaryHndl)
 	}
 
+	logInfo.Printf("start server and listen on: '%s'\n", webServerCfg.addr)
 	if webServerCfg.useTLS {
-		logInfo.Printf("start server and listen on: 'https://%s'\n", addr)
-		logError.Println(http.ListenAndServeTLS(addr, webServerCfg.certFile, webServerCfg.keyFile, nil))
+		logInfo.Printf("open 'https://%s' in your browser\n", webServerCfg.addr)
+		logError.Println(http.ListenAndServeTLS(webServerCfg.addr, webServerCfg.certFile, webServerCfg.keyFile, nil))
 	} else {
-		logInfo.Printf("start server and listen on: 'http://%s'\n", addr)
-		logError.Println(http.ListenAndServe(addr, nil))
+		logInfo.Printf("open 'http://%s' in your browser\n", webServerCfg.addr)
+		logError.Println(http.ListenAndServe(webServerCfg.addr, nil))
 	}
 }