3 FTP: Client Downloading

(require net/ftp)

The net/ftp library provides utilities for FTP client operations.

The library was written by Micah Flatt.

3.1 Functions

(ftp-connection? v) → boolean?

v : any/c

Returns #t if v represents an FTP connection as returned by ftp-establish-connection, #f otherwise.

(ftp-establish-connection   server             port-no             user             passwd)   →   ftp-connection?

server : string?

port-no : (integer-in 0 65535)

user : string?

passwd : string?

Establishes an FTP connection with the given server using the supplied username and password.

The username and password strings are encoded to bytes using the current locale’s encoding.

(ftp-close-connection ftp-conn) → void?

ftp-conn : ftp-connection?

Closes an FTP connection.

(ftp-cd ftp-conn new-dir) → void?

ftp-conn : ftp-connection?

new-dir : string?

Changes the current directory on the FTP server to new-dir. The new-dir argument is not interpreted at all, but simply passed on to the server (encoded using the current locale’s encoding); it must not contain a newline.

(ftp-directory-list ftp-conn)

→   (listof (list/c (one-of/c "-" "d" "l")                 string?                 string?))

ftp-conn : ftp-connection?

Returns a list of files and directories in the current directory of the server, assuming that the server provides directory information in the quasi-standard Unix format.

Each file or directory is represented by a list of three strings. The first string is either "-", "d", or "l", depending on whether the items is a file, directory, or link, respectively. The second item is the file’s date; to convert this value to seconds consistent with file-seconds, pass the date string to ftp-make-file-seconds, below. The third string is the name of the file or directory.

All strings are decoded from bytes using the current locale’s encoding.

(ftp-make-file-seconds ftp-date) → exact-integer?

ftp-date : string?

Takes a date string produced by ftp-directory-list and converts it to seconds (which can be used with seconds->date).

(ftp-download-file ftp-conn local-dir file) → void?

ftp-conn : ftp-connection?

local-dir : path-string?

file : string?

Downloads file from the server’s current directory and puts it in local-dir using the same name. If the file already exists in the local directory, it is replaced, but only after the transfer succeeds (i.e., the file is first downloaded to a temporary file, then moved into place on success).

3.2 FTP Unit

(require net/ftp-unit)

ftp@ : unit?

Imports nothing, exports ftp^.

3.3 FTP Signature

(require net/ftp-sig)

ftp^ : signature

Includes everything exported by the net/ftp module.