SSH library for Java

Question

Does anyone have an example of an SSH library connection using Java

User · Answer

Take a look at the very recently released SSHD  which is based on the Apache MINA project

User · Answer

Update  The GSOC project and the code there isn t active  but this is  https   github com hierynomus sshj  hierynomus took over as maintainer since early 2015   Here is the older  no longer maintained  Github link   https   github com shikhar sshj    There was a GSOC project    http   code google com p commons-net-ssh   Code quality seem to be better than JSch  which  while a complete and working implementation  lacks documentation  Project page spots an upcoming beta release  last commit to the repository was mid-august   Compare the APIs   http   code google com p commons-net-ssh       SSHClient ssh   new SSHClient          ssh useCompression         ssh loadKnownHosts        ssh connect  localhost        try           ssh authPublickey System getProperty  user name             new SCPDownloadClient ssh  copy  ten     tmp          finally           ssh disconnect            http   www jcraft com jsch   Session session   null  Channel channel   null   try    JSch jsch   new JSch    session   jsch getSession username  host  22   java util Properties config   new java util Properties    config put  StrictHostKeyChecking    no    session setConfig config   session setPassword password   session connect        exec  scp -f rfile  remotely String command    scp -f     remoteFilename  channel   session openChannel  exec      ChannelExec  channel  setCommand command       get I O streams for remote scp OutputStream out   channel getOutputStream    InputStream in   channel getInputStream     channel connect     byte   buf   new byte 1024       send   0  buf 0    0  out write buf  0  1   out flush     while  true        int c   checkAck in       if  c     C             break                read  0644       in read buf  0  5        long filesize   0L      while  true            if  in read buf  0  1   lt  0                   error             break                    if  buf 0                        break                    filesize   filesize   10L    long   buf 0  -  0               String file   null      for  int i   0   i              in read buf  i  1           if  buf i      byte  0x0a                file   new String buf  0  i               break                          send   0      buf 0    0      out write buf  0  1       out flush            read a content of lfile     FileOutputStream fos   null       fos   new FileOutputStream localFilename       int foo      while  true            if  buf length  lt  filesize                foo   buf length            else               foo    int  filesize                    foo   in read buf  0  foo           if  foo  lt  0                   error             break                    fos write buf  0  foo           filesize -  foo          if  filesize    0L                break                      fos close        fos   null       if  checkAck in     0            System exit 0                 send   0      buf 0    0      out write buf  0  1       out flush         channel disconnect        session disconnect         catch  JSchException jsche        System err println jsche getLocalizedMessage       catch  IOException ioe        System err println ioe getLocalizedMessage       finally       channel disconnect        session disconnect

User · Answer

I took miku s answer and jsch example code  I then had to download multiple files during the session and preserve original timestamps  This is my example code how to do it  probably many people find it usefull  Please ignore filenameHack   function its my own usecase   package examples   import com jcraft jsch    import java io    import java util     public class ScpFrom2        public static void main String   args  throws Exception           Map lt String String gt  params   parseParams args           if  params isEmpty                  System err println  usage  java ScpFrom2                           user myid password mypwd                          host myhost com port 22                          encoding  lt ISO-8859-1 UTF-8     gt                             remotefile1  some file png                              localfile1 file png                              remotefile2  other file txt                              localfile2 file txt                                return                        default values         if  params get  port      null              params put  port    22            if  params get  encoding      null              params put  encoding    ISO-8859-1       UTF-8           Session session   null          try               JSch jsch new JSch                session jsch getSession                      params get  user        myuserid                     params get  host        my server com                     Integer parseInt params get  port       22                            session setPassword  params get  password                  session setConfig  StrictHostKeyChecking    no       do not prompt for server signature              session connect                    this is exec command and string reply encoding             String encoding   params get  encoding                 int fileIdx 0              while true                    fileIdx                     String remoteFile   params get  remotefile  fileIdx                   String localFile   params get  localfile  fileIdx                   if  remoteFile    null    remoteFile equals                                localFile    null    localFile equals                           break                   remoteFile   filenameHack remoteFile                   localFile    filenameHack localFile                    try                       downloadFile session  remoteFile  localFile  encoding                     catch  Exception ex                        ex printStackTrace                                               catch Exception ex                ex printStackTrace              finally               try  session disconnect      catch Exception ex                         private static void downloadFile Session session               String remoteFile  String localFile  String encoding  throws Exception              send exec command  scp -p -f   some file png             -p   read file timestamps            -f   From remote to local         String command   String format  scp -p -f    s     remoteFile            System console   printf  send command   s n   command           Channel channel session openChannel  exec              ChannelExec channel  setCommand command getBytes encoding                get I O streams for remote scp         byte   buf new byte 32 1024           OutputStream out channel getOutputStream            InputStream in channel getInputStream             channel connect             buf 0  0  out write buf  0  1   out flush       send   0              reply  T lt mtime gt  0  lt atime gt  0 n            times are in seconds  since 1970-01-01 00 00 00 UTC          int c checkAck in           if c   T               throw new IOException  Invalid timestamp reply from server             long tsModified   -1     millis         for int idx 0    idx                 in read buf  idx  1               if tsModified  lt  0  amp  amp  buf idx                          tsModified   Long parseLong new String buf  0  idx   1000                else if buf idx     n                     break                                   buf 0  0  out write buf  0  1   out flush       send   0              reply  C0644  lt binary length gt   lt filename gt  n            length is given as a text  621873  bytes         c checkAck in           if c   C               throw new IOException  Invalid filename reply from server             in read buf  0  5      read  0644   bytes          long filesize -1          for int idx 0    idx                 in read buf  idx  1               if buf idx                          filesize   Long parseLong new String buf  0  idx                    break                                      read remote filename         String origFilename null          for int idx 0    idx                 in read buf  idx  1               if buf idx     n                     origFilename new String buf  0  idx  encoding      UTF-8  ISO-8859-1                 break                                   System console   printf  size  d  modified  d  filename  s n                    filesize  tsModified  origFilename            buf 0  0  out write buf  0  1   out flush       send   0              read binary data  write to local file         FileOutputStream fos   null          try               File file   new File localFile               fos   new FileOutputStream file               while filesize  gt  0                    int read   Math min buf length   int filesize                   read in read buf  0  read                   if read  lt  0                      throw new IOException  Reading data failed                     fos write buf  0  read                   filesize -  read                            fos close       we must close file before updating timestamp             fos   null              if  tsModified  gt  0                  file setLastModified tsModified                            finally               try  if  fos  null  fos close      catch Exception ex                       if checkAck in     0              return           buf 0  0  out write buf  0  1   out flush       send   0          System out println  Binary data read                    private static int checkAck InputStream in  throws IOException              b may be 0 for success                     1 for error                      2 for fatal error                      -1         int b in read            if b  0  return b          else if b  -1  return b          if b  1    b  2                StringBuilder sb new StringBuilder                int c              do                   c in read                    sb append  char c                 while c    n                throw new IOException sb toString                       return b                         Parse key value pairs to hashmap          param args         return             private static Map lt String String gt  parseParams String   args  throws Exception           Map lt String String gt  params   new HashMap lt String String gt             for String keyval   args                int idx   keyval indexOf                   params put                      keyval substring 0  idx                       keyval substring idx 1                                   return params             private static String filenameHack String filename               It s difficult reliably pass unicode input parameters             from Java dos command line             This dirty hack is my very own test use case           if  filename contains    filename1                 filename   filename replace    filename1     Korilla ABC        txt            else if  filename contains    filename2                 filename   filename replace    filename2     test2 ABC        txt                       return filename

User · Answer

I just discovered sshj  which seems to have a much more concise API than JSCH  but it requires Java 6    The documentation is mostly by examples-in-the-repo at this point  and usually that s enough for me to look elsewhere  but it seems good enough for me to give it a shot on a project I just started

User · Answer

The Java Secure Channel  JSCH  is a very popular library  used by maven  ant and eclipse  It is open source with a BSD style license

User · Answer

http   code google com p connectbot   Compile src com trilead ssh2 on windows linux or android   it can create Local Port Forwarder or create Dynamic Port Forwarder or other else

User · Answer

There is a brand new version of Jsch up on github  https   github com vngx vngx-jsch Some of the improvements include  comprehensive javadoc  enhanced performance  improved exception handling  and better RFC spec adherence  If you wish to contribute in any way please open an issue or send a pull request

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