Команды для tftp linux

Команды для tftp linux

get remotefile localfile

get file1 file2 file3. Get a file or set of files from the specified sources. A remote filename can be in one of two forms: a plain filename on the remote host, if the host has already been specified, or a string of the form host:filename to specify both a host and filename at the same time. If the latter form is used, the last hostname specified becomes the default for future transfers. mode transfer-mode Specify the mode for transfers; transfer-mode may be one of ascii (or netascii ) or binary (or octet .) The default is ascii . put file

put localfile remotefile

put file1 file2 file3. remote-directory Put a file or set of files to the specified remote file or directory. The destination can be in one of two forms: a filename on the remote host, if the host has already been specified, or a string of the form host:filename to specify both a host and filename at the same time. If the latter form is used, the hostname specified becomes the default for future transfers. If the remote-directory form is used, the remote host is assumed to be a UNIX system or another system using / as directory separator. quit Exit tftp . End-of-file will also exit. rexmt retransmission-timeout Set the per-packet retransmission timeout, in seconds. status Show current status. timeout total-transmission-timeout Set the total transmission timeout, in seconds. trace Toggle packet tracing (a debugging feature.) verbose Toggle verbose mode.

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How To Install, Configure, and Run Linux Tftp Client?

Tftp (Trivial File Transfer Protocol) is a very simple client-server protocol used to transfer data and files over the network. Ftp is a very popular protocol but it has a lot of features that may not be needed always. Tftp is a lightweight alternative to Ftp protocol. We can say that Tftp is a featureless protocol because it only downloads and uploads files.

• Tftp has no authentication or authorization mechanism.
• Tftp protocol does not have a file listing feature.
• Tftp is clear text or not encrypted protocol
• Tftp is fast and simple to implement
• TFTP uses generally UDP

Install Tftp

The installation of Tftp tools is as simple as the protocol. As TFTP lightweight there is no dependency for other libraries.

Ubuntu, Debian, Mint, Kali:

We will install tftp for Debian, Mint, Ubuntu and Kali like below.

Fedora, CentOS, RedHat:

We can install tftp with the following command on Fedora, CentOS, RedHat.

tftp Command Syntax

We will use following syntax for tftp command in normal command-line usage.

tftp Command Help

Connect TFTP Server From Command Line

Connecting to the Tftp server is very easy. As stated at the beginning of the post Tftp does not have any authentication and authorization mechanisms. so Just providing the hostname of the server of IP address is enough to connect the Tftp server. In this example, we will connect 192.168.122.239 IP address.

TFTP Server Command Line Interactive Shell

After connection to the Tftp server, we will get an interactive shell. In this shell, we will issue commands to get information about status of the connection, download or get files, upload, or put files to the server. We can list available commands provided by Tftp shell with ? .

Upload or Put File To The TFTP Server

We can upload or put files to the TFTP server with the put command. In the example, we upload a file named body.txt

Download or Get File From TFTP Server

We can also download or get files from the Tftp server to get command. In the example, we get a file named body.txt from the Tftp server.

Show TFTP Connection Status

As TFTP works generally on the UDP protocol there is no session like TCP. But we can query current connection status with the status command. This status command will provide us information about the connected server IP address, current working mode, Rexmt-interval, Max-timeout, etc.

Disconnect From TFTP Server by Exiting From TFTP Shell

In order to quit from the Tftp shell we need to issue the q command.

Verbose Mode

While making transfer we may need more information about the transmission. We can get more information about the transfer with the verbose mode.

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Команды для tftp linux

tftp is the user interface to the Internet TFTP (Trivial File Transfer Protocol), which allows users to transfer files to and from a remote machine. The remote host and optional port may be specified on the command line, in which case tftp uses host as the default host, and if specified, port as the default port, for future transfers. See the connect command below.

USAGE

Once tftp is running, it issues the prompt tftp> and recognizes the following commands:

Commands

connect host-name [ port ]

Set the host , and optionally port , for transfers. The TFTP protocol, unlike the FTP protocol, does not maintain connections between transfers; thus, the connect command does not actually create a connection, but merely remembers what host is to be used for transfers. You do not have to use the connect command; the remote host can be specified as part of the get or put commands.

Set the mode for transfers; transfer-mode may be one of ascii or binary . The default is ascii .

put filename
put localfile remotefile
put filename1 filename2 . filenameN remote-directory

Transfer a file, or a set of files, to the specified remote file or directory. The destination can be in one of two forms: a filename on the remote host if the host has already been specified, or a string of the form:

to specify both a host and filename at the same time. If the latter form is used, the specified host becomes the default for future transfers. If the remote-directory form is used, the remote host is assumed to be running the UNIX system.

The host can be a host name (see hosts (4)) or an IPv4 or IPv6 address string (see inet (7P) or inet6 (7P)). Since IPv6 addresses already contain «:»s , the host should be enclosed in square brackets when an IPv6 address is used. Otherwise, the first occurrence of a colon will be interpreted as the separator between the host and the filename . For example,

Files may be written only if they already exist and are publicly writable. See in.tftpd (1M).

get filename
get remotename localname
get filename1 filename2 filename3 . filenameN

Get a file or set of files (three or more) from the specified remote sources . source can be in one of two forms: a filename on the remote host if the host has already been specified, or a string of the form:

to specify both a host and filename at the same time. If the latter form is used, the last host specified becomes the default for future transfers. See the put command regarding specifying a host .

Exit tftp . An EOF also exits.

Toggle verbose mode.

Toggle packet tracing.

Show current status.

Set the per-packet retransmission timeout, in seconds.

Set the total transmission timeout, in seconds.

Shorthand for mode ascii .

Shorthand for mode binary .

The value of the transfer blocksize option to negotiate with the server. A value of 0 disables the negotiation of this option.

The value of the retransmission timeout option to request that the server uses. A value of 0 disables the negotiation of this option.

A toggle that sends the transfer size option to the server. By default, the option is not sent. The transfer size option is not sent with a write request when the transfer-mode is ascii .

Print help information.

ATTRIBUTES

See attributes (5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE Availability SUNWtftp

SEE ALSO

Malkin, G. and Harkin, A. RFC 2347, TFTP Option Extension . The Internet Society. May 1998

Malkin, G. and Harkin, A. RFC 2348, TFTP Blocksize Option . The Internet Society. May 1998

Malkin, G. and Harkin, A. RFC 2349, TFTP Timeout Interval and Transfer Size Options . The Internet Society. May 1998

Sollins, K.R. RFC 1350, The TFTP Protocol (Revision 2) . Network Working Group. July 1992.

NOTES

The default transfer-mode is ascii . This differs from pre-SunOS 4.0 and pre-4.3BSD systems, so explicit action must be taken when transferring non-ASCII binary files such as executable commands.

Because there is no user-login or validation within the TFTP protocol, many remote sites restrict file access in various ways. Approved methods for file access are specific to each site, and therefore cannot be documented here.

When using the get command to transfer multiple files from a remote host, three or more files must be specified. If two files are specified, the second file is used as a local file.

With the default block size of 512 octets and a 16- bit block counter, some TFTP implementations might have problems with files over 33,553,919 octets ( 513 octets short of 32MB ) in size. The Solaris implementation can transfer files up to 4GB in size.

By default, the Solaris TFTP client does not enable the blocksize or transfer size options. Setting the blocksize option to a higher value is sometimes useful as a workaround when dealing with peers that have a 32MB limit.

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Ubuntu Documentation

A network administrator may find the need to deploy a TFTP server quickly and cost effectively. The reader may find that there is more than one TFTP server package available for Ubuntu systems.

including tftpd, atftpd, and tftpd-hpa. tftpd-hpa was chosen in this scenario because of its relative «up-to-date-ness» and availability of documentation.

Introduction

This document will guide the reader on how to setup a TFTP server that will allow clients to both download and upload files.

(This process has been completely tested and verified on 11/18/2015 using Ubuntu 14.04.3 Server and the latest version of tftpd-hpa available from the apt repositories (tftpd-hpa_5.2-7ubuntu3_amd64.deb))

Installation

Once the installation is complete, you will have a running TFTP server on your system that will be listening on all active network interfaces, on both IPv4 and IPv6. All you will be able to do is download files from the TFTP server. Uploading will not work. We will fix that in the Configuration section below.
You can confirm this by running.

The default configuration file for tftpd-hpa is /etc/default/tftpd-hpa.
The default root directory where files will be stored is /var/lib/tftpboot.

Configuration

Edit tftpd-hpa Configuration File

As mentioned before, all you will be able to do at this point is download files from the TFTP server. If you want to upload to the TFTP server, read on. To begin with, make a copy of the default tftpd-hpa configuration file.

Then, edit the tftpd-hpa configuration file.

and change the line that reads.

and save the file and exit the vi editor.

Modify Permissions on TFTP Root Directory

The root directory where files must be stored in order to access them via TFTP is /var/lib/tftpboot. If you want to be able to upload to that directory, then perform the following command.

Restart the tftpd-hpa Service

To make the changes take effect, the tftpd-hpa service must be restarted. This can be accomplished by performing the following command.

At this point you should now have a TFTP server that allows you to both download and upload files.

Additional Information

tftpd-hpa seems to be somewhat tied to traditional tftpd. For more information try.

External Links

An external links section can be used to point users towards general information about the subject matter of the page, such as a wikipedia entry or project homepage. This section is optional.

http://chschneider.eu/linux/server/tftpd-hpa.shtml — The first «how to» that I used to go through this process.

TFTP (последним исправлял пользователь tony-fischer 2015-11-19 21:50:29)

The material on this wiki is available under a free license, see Copyright / License for details
You can contribute to this wiki, see Wiki Guide for details

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tftp(1) — Linux man page

tftp — IPv4 Trivial File Transfer Protocol client

Synopsis

Description

tftp is a client for the Trivial file Transfer Protocol, which can be used to transfer files to and from remote machines, including some very minimalistic, usually embedded, systems. The remote host may be specified on the command line, in which case tftp uses host as the default host for future transfers (see the connect command below.)

Options

Connect with IPv4 only, even if IPv6 support was compiled in.

Connect with IPv6 only, if compiled in. -c command Execute command as if it had been entered on the tftp prompt. Must be specified last on the command line. -l

Default to literal mode. Used to avoid special processing of ‘:’ in a file name. -m mode Set the default transfer mode to mode. This is usually used with -c. -R port:port Force the originating port number to be in the specified range of port numbers. -v

Default to verbose mode.

Print the version number and configuration to standard output, then exit gracefully.

Commands

Once tftp is running, it issues the prompt tftp> and recognizes the following commands: ? command-name. help command-name. Print help information ascii

Shorthand for mode ascii.

Shorthand for mode binary. connect host [port] Set the host (and optionally port) for transfers. Note that the TFTP protocol, unlike the FTP protocol, does not maintain connections between transfers; thus, the connect command does not actually create a connection, but merely remembers what host is to be used for transfers. You do not have to use the connect command; the remote host can be specified as part of the get or put commands. get file get remotefile localfile get file1 file2 file3. Get a file or set of files from the specified sources. A remote filename can be in one of two forms: a plain filename on the remote host, if the host has already been specified, or a string of the form host:filename to specify both a host and filename at the same time. If the latter form is used, the last hostname specified becomes the default for future transfers. Enable literal mode to prevent special treatment of the ‘:’ character (e.g. C:\dir\file). literal Toggle literal mode. When set, this mode prevents special treatment of ‘:’ in filenames. mode transfer-mode Specify the mode for transfers; transfer-mode may be one of ascii (or netascii) or binary (or octet.) The default is ascii. put file put localfile remotefile put file1 file2 file3. remote-directory Put a file or set of files to the specified remote file or directory. The destination can be in one of two forms: a filename on the remote host, if the host has already been specified, or a string of the form host:filename to specify both a host and filename at the same time. If the latter form is used, the hostname specified becomes the default for future transfers. If the remote-directory form is used, the remote host is assumed to be a UNIX system or another system using / as directory separator. Enable literal mode to prevent special treatment of the ‘:’ character (e.g. C:\dir\file). quit

Exit tftp. End-of-file will also exit. rexmt retransmission-timeout Set the per-packet retransmission timeout, in seconds. status

Show current status. timeout total-transmission-timeout Set the total transmission timeout, in seconds. trace

Toggle packet tracing (a debugging feature.) verbose Toggle verbose mode.

Notes

The TFTP protocol provides no provisions for authentication or security. Therefore, the remote server will probably implement some kinds of access restriction or firewalling. These access restrictions are likely to be site- and server-specific.

Author

This version of tftp is maintained by H. Peter Anvin . It was derived from, but has substantially diverged from, an OpenBSD source base, with added patches by Markus Gutschke and Gero Kulhman.

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