Awesome

paradise_ftp

paradise_ftp is a powerful, 100% native (golang) ftp server that is production ready.

It can handle 1000's of connections and 1000's of files flying back and forward sideways under and through. It does not run out of file descriptors. It does not forget to close any socket connection or socket listener. Ahem hem, cough cough, looking at you https://github.com/goftp/server.

FYI FTP is a big protocol and I only implemented the stuff I needed. Stuff that's here:

passive socket connections (not active ones)
uploading files (not downloading)
directory listing
user authentication (soon to suppport Bitium API https://developer.bitium.com)
Both EPSV and PASV commands
uploads large files without reading entire file into memory
uploads read first 512 bytes of file first into bufffer to check mime type
graceful restarts by sending kill -USR2 pid
There is a good fork here https://github.com/fclairamb/ftpserver with even more stuff!

Sample Run:

$ ftp ftp://auser:secret@127.0.0.1:2121
Connected to 127.0.0.1.
220 Welcome to Paradise
331 User name ok, password required
230 Password ok, continue
Remote system type is UNIX.
Using binary mode to transfer files.
200 Type set to binary

ftp> dir
229 Entering Extended Passive Mode (|||55729|)
150 Opening ASCII mode data connection for file list
-rw-r--r-- 1 paradise ftp        13984 Mar 12 11:51 paradise.txt
-rw-r--r-- 1 paradise ftp        13984 Mar 12 11:51 paradise.txt
-rw-r--r-- 1 paradise ftp        13984 Mar 12 11:51 paradise.txt
-rw-r--r-- 1 paradise ftp        13984 Mar 12 11:51 paradise.txt
-rw-r--r-- 1 paradise ftp        13984 Mar 12 11:51 paradise.txt

226 Closing data connection, sent bytes
ftp> put file_driver.go 
local: file_driver.go remote: file_driver.go
229 Entering Extended Passive Mode (|||55732|)
150 Data transfer starting
100% |**********************************************************************|  4624        8.89 MiB/s    00:00 ETA
226 OK, received some bytes
4624 bytes sent in 00:00 (981.44 KiB/s)
ftp>

Server Output:

$ ./paradise 
listening on:  localhost:2121
Got client on:  127.0.0.1:55728

Web Monitoring Output:

2 client(s), 6 passive(s), Up for 00:00:29
   41949e 00:00:20, user1
     0fbeb0 00:00:08, 59119 LIST 
     7dcdf7 00:00:04, 59441 EPSV 
   2d3beb 00:00:13, user2
     dc6776 00:00:13, 58859 LIST 
     2772a8 00:00:10, 58989 STOR hello.txt