tftpd
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(5).
The server is normally started by
inetd(8).
The use of
tftp(1)
does not require an account or password on the remote system.
Due to the lack of authentication information,
tftpd
will allow only publicly readable files to be accessed.
Files may be written only if they already exist and are publicly writable,
unless the
-c
flag is specified
(see below).
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,
unless the
-s
flag is specified
(see below),
in which case it must be started with user ID 0.
Access to files may be restricted by invoking
tftpd
with a list of directories by including pathnames
as server program arguments in
/etc/inetd.conf.
In this case access is restricted to files whose
names are prefixed by one of the given directories.
The options are as follows:
-c
Allow new files to be created;
otherwise uploaded files must already exist.
Files are created with default permissions
allowing anyone to read or write to them.
-l
Log the client IP, type of request, and filename using
syslog(3)
with a facility of
LOG_INFO.
-s directory
chroot(2)
to
directory
on startup;
the remote host is not expected to pass the directory
as part of the file name to transfer.
This option is intended primarily for
compatibility with SunOS boot ROMs which do not include a directory name.