FTPD.8
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上传日期:2007-02-01
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操作系统开发
开发平台:
C/C++
- FTPD(8) Minix Programmer's Manual FTPD(8)
- NAME
- ftpd, in.ftpd, setup.anonftp - DARPA Internet File Transfer Protocol
- server
- SYNOPSIS
- ftp stream tcp nowait root /usr/sbin/in.ftpd in.ftpd
- tcpd ftp /usr/sbin/in.ftpd
- DESCRIPTION
- Ftpd is the DARPA Internet File Transfer Prototocol server process. The
- server uses the TCP protocol and listens at the port specified in the
- ``ftp'' service specification; see services(5).
- The ftp server currently supports the following ftp requests; case is
- not distinguished.
- Request Description
- ABOR abort previous command
- ACCT specify account (ignored)
- ALLO allocate storage (vacuously)
- APPE append to a file
- CDUP change to parent of current working directory
- CWD change working directory
- DELE delete a file
- HELP give help information
- LIST give list files in a directory (``ls -lA'')
- MKD make a directory
- MODE specify data transfer mode
- NLST give name list of files in directory (``ls'')
- NOOP do nothing
- PASS specify password
- PASV prepare for server-to-server transfer
- PORT specify data connection port
- PWD print the current working directory
- QUIT terminate session
- RETR retrieve a file
- RMD remove a directory
- RNFR specify rename-from file name
- RNTO specify rename-to file name
- STOR store a file
- STOU store a file with a unique name
- STRU specify data transfer structure
- TYPE specify data transfer type
- USER specify user name
- XCUP change to parent of current working directory
- XCWD change working directory
- XMKD make a directory
- XPWD print the current working directory
- XRMD remove a directory
- 1
- FTPD(8) Minix Programmer's Manual FTPD(8)
- The remaining ftp requests specified in Internet RFC 959 are recognized,
- but not implemented.
- The ftp server will abort an active file transfer only when the ABOR
- command is preceded by a Telnet "Interrupt Process" (IP) signal and a
- Telnet "Synch" signal in the command Telnet stream, as described in
- Internet RFC 959.
- Ftpd interprets file names according to the ``globbing'' conventions used
- by csh(1). This allows users to utilize the metacharacters ``*?[]{}~''.
- Ftpd authenticates users according to three rules.
- 1) The user name must be in the password data base, /etc/passwd, and
- not have a null password. In this case a password must be provided
- by the client before any file operations may be performed.
- 2) The user name must not appear in the file /etc/ftpusers.
- 3) If the user name is ``anonymous'' or ``ftp'', an anonymous ftp
- account must be present in the password file (user ``ftp''). In
- this case the user is allowed to log in by specifying any password
- (by convention this is given as the client host's name).
- In the last case, ftpd takes special measures to restrict the client's
- access privileges. The server performs a chroot(2) command to the home
- directory of the ``ftp'' user. In order that system security is not
- breached, it is recommended that the ``ftp'' subtree be constructed with
- care; the following rules are recommended.
- ~ftp)
- Make the home directory owned by ``ftp'' and unwritable by anyone.
- ~ftp/bin)
- Make this directory owned by the super-user and unwritable by
- anyone. The program ls(1) must be present to support the list
- commands. This program should have mode 111.
- ~ftp/etc)
- Make this directory owned by the super-user and unwritable by
- anyone. The files passwd(5) and group(5) must be present for the ls
- command to work properly. These files should be mode 444.
- ~ftp/pub)
- Make this directory mode 755 and owned by the super-user. Create
- directories in it owned by users if those users want to manage an
- anonymous ftp directory.
- 2
- FTPD(8) Minix Programmer's Manual FTPD(8)
- ~ftp/pub/incoming)
- Optionally create this directory for anonymous uploads. Make it
- mode 777. The FTP daemon will create files with mode 266, so remote
- users can write a file, but only local users can do something with
- it.
- The script setup.anonftp can be used to create or check an anonymous FTP
- tree.
- SEE ALSO
- ftp(1).
- BUGS
- The anonymous account is inherently dangerous and should avoided when
- possible.
- 3