iX 6.5)

Chapter 5 71

TFTP Service

Conﬁguring tftpd

Specifying a Search Path

As an option, you can use the [path…] parameter in the inetd

conﬁguration ﬁle entry to specify the list of ﬁles or directories that are

available to TFTP clients. For example, if you would like to have the

/tmp and /bin directories available to TFTP clients in addition to the

home group of the TFTP user, edit the line to look like this:

tftp dgram udp wait USER.TFTP /SYS/NET/TFTPD tftpd /tmp

/bin

When a ﬁle is requested by a TFTP client, tftpd ﬁrst looks for a ﬁle

relative to the home directory of the user speciﬁed in the inetd

conﬁguration ﬁle. If it does not ﬁnd the ﬁle there, it then checks to see if

the following two conditions are met:

• File requested is at or below [path].

• User speciﬁed in the inetd conﬁguration ﬁle (in the previous

examples, USER.TFTP) has access to the ﬁle.

When invoked with no path arguments, tftpd cannot follow symbolic

links that refer to paths outside of the home directory of the user

speciﬁed in the inetd conﬁguration ﬁle.

Permission to Retrieve Files

If permission is given to remote systems to retrieve a ﬁle through TFTP,

then the ﬁle must be readable by the user speciﬁed in the inetd

conﬁguration ﬁle. If permission is given to remote systems to transmit a

ﬁle through TFTP, then the ﬁle must already exist and be writable by

the user speciﬁed in the inetd conﬁguration ﬁle.