FTPFS(4) FTPFS(4) NAME ftpfs - file transfer protocol (FTP) file system SYNOPSIS ftpfs [ -/dqn ] [ -m mountpoint ] [ -a password ] [ -e ext ] [ -o os ] [ -r remoteroot ] system DESCRIPTION Ftpfs dials the TCP file transfer protocol (FTP) port, 21, on system and mounts itself (see bind(2)) on mountpoint (default /n/ftp) to provide access to files on the remote machine. If required by the remote machine, ftpfs will prompt for a user name and password. The user names ftp and anonymous conventionally offer guest/read-only access to machines. Anonymous FTP may be called without user interac- tion by using the -a option and specifying the password. By default the file seen at the mount point is the user's remote home directory if he has one. The option -/ forces the mount point to correspond to the remote root. The option -r forces the mount point to correspond to the remote directory remoteroot. To avoid seeing startup messages from the server use option -q. To see all messages from the server use option -d. Some systems will hangup an ftp connection that has no activity for a given period. The -k option causes ftp to send a NOP command every 15 seconds to attempt to keep the connection open. This command can cause some servers to hangup, so you'll have to feel your way. To terminate the connection, unmount (see bind(1)) the mount point. Since there is no specified format for metadata retrieved in response to an FTP directory request, ftpfs has to apply heuristics to steer the interpretation. Sometimes, though rarely, these heuristics fail. The following options are meant as last resorts to try to steer interpretation. A major clue to the heuristics is the operating system at the other end. Normally this can be determined automati- cally using the FTP SYST command. However, in some cases the server doesn't implement the SYST command. The -o option will force the case by specifyng the name of the operating system. Known systems types are are: Unix, Sun, Tops, Plan9 VM, VMS, MVS, NetWare, OS/2, TSO, and WINDOWS_NT. Page 1 Plan 9 (printed 12/25/24) FTPFS(4) FTPFS(4) Some systems and/or FTP servers return directory listings that don't include the file extension. The -e option allows the user to specify an extension to append to all remote files (other than directories). Finally, there are two FTP commands to retrieve the contents of a directory, LIST and NLST. LIST is approximately equiv- alent to `ls -l' and NLST to `ls'. Ftpfs normally uses LIST. However, some FTP servers interpret LIST to mean, give a wordy description of the file. Ftpfs normally notices this and switches to using NLST. However, in some rare cases, the user must force the use of NLST with the -n option. EXAMPLE You want anonymous FTP access to the system export.lcs.mit.edu. The first import(4) command is only necessary if your machine does not have access to the desired system, but another, called gateway in this example, does. import gateway /net ftpfs -a yourname@yourmachine export.lcs.mit.edu SOURCE /sys/src/cmd/ftpfs SEE ALSO bind(2) BUGS Symbolic links on remote Unix systems will always have mode 0777 and a length of 8. After connecting to a TOPS-20 system, the mount point will contain only one directory, usually /n/ftp/PS:<ANONYMOUS>. However, walking to any valid directory on that machine will succeed and cause that directory entry to appear under the mount point. Ftpfs caches files and directories. A directory will fall from the cache after 5 quiescent minutes or if the local user changes the directory by writing or removing a file. Otherwise, remote changes to the directory that occur after the directory has been cached might not be immediately visi- ble. There is no way to issue the appropriate commands to handle special synthetic FTP file types such as directories that automatically return a tar of their contents. Page 2 Plan 9 (printed 12/25/24)