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TFTPD(8C)                                                            TFTPD(8C)



NAME
       tftpd, in.tftpd - TCP/IP Trivial File Transfer Protocol server

SYNOPSIS
       /usr/etc/in.tftpd [-s] [ homedir ]

Sun386i SYNOPSIS
       /usr/etc/in.tftpd [-s] [-p] [ homedir ]

AVAILABILITY
       This  program  is  available  with the Networking software installation
       option.  Refer to for information on how to install optional software.

DESCRIPTION
       tftpd is a server that supports the TCP/IP Trivial File Transfer Proto-
       col  (TFTP).  This server is normally started by inetd(8C) and operates
       at the port indicated in the tftp Internet service description  in  the
       /etc/inetd.conf  file;  see  inetd.conf(5)  for  details.   The default
       /etc/inetd.conf file starts this server in secure mode, that  is,  with
       the  -s  option  enabled.   To run unsecure tftpd, modify this file and
       remove the -s option.

       Before responding to a request, the server attempts to change its  cur-
       rent directory to homedir; the default value is /tftpboot.

Sun386i DESCRIPTION
       The  tftpd  daemon acts as described above, except that it will perform
       certain filename mapping operations unless instructed otherwise by  the
       -p  command  line  argument  or when operating in a secure environment.
       This mapping affects only  TFTP  boot  requests  and  will  not  affect
       requests for existing files.

       The semantics of the changes are as follows. Only filenames of the for-
       mat ip-address or ip-address.arch, where ip-address is the  IP  address
       in  hex,  and  arch  is  the  hosts's  architecture (as returned by the
       arch(1) command), that do not correspond to  files  in  /tftpboot,  are
       mapped.   If the address is known through a Network Information Service
       (NIS) lookup, any file of the form /tftpboot/ip-address* (with or with-
       out  a  suffix)  is returned. If there are multiple such files, any one
       may be returned. If the ip-address is unknown (that is if  the  ipalloc
       (8C)  service  says  the  name  service does not know the address), the
       filename is mapped as follows: Names without the arch suffix are mapped
       into  the name pnp.SUN3, and names with the suffix are mapped into pnp.
       arch.  That file is returned if it exists.

OPTIONS
       -s     Secure.  When specified, the directory change must succeed;  and
              the  daemon  also  changes  its root directory to homedir.  This
              option is set in the default /etc/inetd.conf file.

              The use of tftp 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.  Note: 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 this service.

       tftpd  runs  with the user ID (UID) and group ID (GID) set to -2, under
       the assumption that no files exist with that owner or group.   However,
       nothing checks this assumption or enforces this restriction.

Sun386i OPTIONS
       -p     Disable pnp entirely. Do not map filenames.

Sun386i FILES
       /tftpboot/*         filenames are IP addresses

SEE ALSO
       tftp(1C) inetd(8C), ipallocd(8C), netconfig(8C),

       Sollins,  K.R., The TFTP Protocol (Revision 2), RFC 783, Network Infor-
       mation Center, SRI International, Menlo Park, Calif., June 1981.

NOTES
       The Network Information Service (NIS) was formerly known as Sun  Yellow
       Pages  (YP).   The  functionality of the two remains the same; only the
       name has changed.

Sun386i WARNINGS
       A request for an ip-address from a Sun-4 can be  satisfied  by  a  file
       named ip-address.386 for compatibility with some early Sun-4 PROM moni-
       tors.



4.2 Berkeley Distribution       7 October 1990                       TFTPD(8C)