TFTPD(8c,C) AIX TCP/IP User's Guide TFTPD(8c,C) ------------------------------------------------------------------------------- tftpd PURPOSE Provides the server function for the Trivial File Transfer Protocol. SYNTAX /etc/tftpd ---| DESCRIPTION The tftpd command is a server which supports the DARPA Trivial File Transfer Protocol. The tftp server operates at the port indicated in the tftp service description (see "services"). The server is normally started by inetd, (see "inetd"). The use of tftp does not require an account or password on the remote system. Due to the lack of verification information, tftpd allows only publicly readable files to be accessed. Files may be written only if they already exist and are publicly writable. Files on the server must be specified with full path names. Since no account information is provided, there is no way to identify a user's home directory. Note that this extends the concept of public to include all users on all hosts that can be reached through the network. This may not be appropriate on all systems, and its implications should be considered before enabling tftp service. The server should have the user ID with the lowest possible privilege. Access to files and directories on the system can be controlled with the file /etc/tftpaccess.ctl. Files and directories can be listed in this file to either allow or deny access through tftp. The format of the file is one entry per line. An entry consists of a keyword (either "deny" or "allow") followed by a colon and an absolute pathname of a file or a directory. Entries should not contain any spaces or tabs. For example, the entry "allow:/tmp/news" will allow tftp acces to the file /tmp/news. The entry "deny:/etc/passwd" denies access to the password file. A deny entry overrides an allow entry. If the /etc/tftpaccess.ctl file exists and a file or directory is not listed, the default is to deny access to that file. To deny access to a file, all links to that file should be listed with deny. Note: If the server site is not running AIX, consult that machine's tftpd documentation for information on restrictions for that site. RELATED INFORMATION In this book: "inetd" "services" "tftp" Processed October 29, 1990 TFTPD(8c,C) 1