RFC 1784 - TFTP Timeout Interval and Transfer Size Options

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The first allows the client and server to negotiate the Timeout Interval. The second allows the side receiving the file to determine the ultimate size of the transfer before it begins. [STANDARDS-TRACK]"> <meta property="og:type" content="article"> <meta property="og:image" content="https://static.ietf.org/dt/12.37.0/ietf/images/ietf-logo-card.png"> <meta property="og:image:alt" content="Logo of the IETF"> <meta property="article:section" content="IETF - Internet Engineering Task Force"> <meta property="og:image:type" content="image/png"> <meta property="og:image:width" content="1200"> <meta property="og:image:height" content="630"> <meta name="twitter:card" content="summary_large_image"> <meta property="article:author" content="Gary S. 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Proposed Standard </span> <br>March 1995 <br> <a class="btn btn-sm btn-warning" title="Click to report an error in the document." href="https://www.rfc-editor.org/errata.php#reportnew" target="_blank"> Report errata </a> <div>Obsoleted by <a href="/doc/html/rfc2349" title="TFTP Timeout Interval and Transfer Size Options">RFC 2349</a></div> <div>Updates <a href="/doc/html/rfc1350" title="The TFTP Protocol (Revision 2)">RFC 1350</a></div> <div> Was <a href="/doc/draft-ietf-tftpexts-options/00/">draft-ietf-tftpexts-options</a> (<a href="/wg/tftpexts/about/">tftpexts WG</a>) </div> </td> </tr> <tr> <td></td> <th scope="row">Select version</th> <td class="edit"></td> <td> <ul class="revision-list pagination pagination-sm text-center flex-wrap my-0"> <li class="page-item"> <a class="page-link" href="/doc/html/draft-ietf-tftpexts-options-00" rel="nofollow"> 00 </a> </li> <li class="page-item rfc active"> <a class="page-link" href="/doc/html/rfc1784"> RFC 1784 </a> </li> </ul> </td> </tr> <tr> <td></td> <th scope="row">Compare versions</th> <td class="edit"></td> <td> <form class="form-horizontal diff-form" action="https://author-tools.ietf.org/iddiff" method="get" target="_blank"> <select class="form-select form-select-sm mb-1 select2-field" data-max-entries="1" data-width="resolve" data-allow-clear="false" data-minimum-input-length="0" aria-label="From revision" name="url1"> <option value="rfc1784"> RFC 1784 </option> <option value="draft-ietf-tftpexts-options-00" selected> draft-ietf-tftpexts-options-00 </option> </select> <select class="form-select form-select-sm mb-1 select2-field" data-max-entries="1" data-width="resolve" data-allow-clear="false" data-minimum-input-length="0" aria-label="To revision" name="url2"> <option value="rfc1784" selected> RFC 1784 </option> <option value="draft-ietf-tftpexts-options-00"> draft-ietf-tftpexts-options-00 </option> </select> <button type="submit" class="btn btn-primary btn-sm" value="--html" name="difftype"> Side-by-side </button> <button type="submit" class="btn btn-primary btn-sm" value="--hwdiff" name="difftype"> Inline </button> </form> </td> </tr> <tr> <td></td> <th scope="row">Authors</th> <td class="edit"> </td> <td> <span ><a title="Datatracker profile of Gary S. Malkin" href="/person/gmalkin@baynetworks.com" >Gary S. Malkin</a> <a href="mailto:gmalkin%40baynetworks.com" aria-label="Compose email to gmalkin@baynetworks.com" title="Compose email to gmalkin@baynetworks.com"> <i class="bi bi-envelope"></i></a></span>, <span ><a title="Datatracker profile of Art Harkin" href="/person/ash@cup.hp.com" >Art Harkin</a> <a href="mailto:ash%40cup.hp.com" aria-label="Compose email to ash@cup.hp.com" title="Compose email to ash@cup.hp.com"> <i class="bi bi-envelope"></i></a></span> <br> <a class="btn btn-primary btn-sm mt-1" href="mailto:rfc1784@ietf.org?subject=rfc1784" title="Send email to the document authors">Email authors</a> </td> </tr> <tr> <td></td> <th scope="row"> RFC stream </th> <td class="edit"> </td> <td > <img alt="IETF Logo" class="d-lm-none w-25 mt-1" src="https://static.ietf.org/dt/12.37.0/ietf/images/ietf-logo-nor-white.svg" > <img alt="IETF Logo" class="d-dm-none w-25 mt-1" src="https://static.ietf.org/dt/12.37.0/ietf/images/ietf-logo-nor.svg" > </td> </tr> <tr> <td></td> <th scope="row"> Other formats </th> <td class="edit"> </td> <td> <div class="buttonlist"> <a class="btn btn-primary btn-sm" target="_blank" href="https://www.rfc-editor.org/rfc/rfc1784.txt"> <i class="bi bi-file-text"></i> txt </a> <a class="btn btn-primary btn-sm" target="_blank" href="https://www.rfc-editor.org/rfc/rfc1784.html"> <i class="bi bi-file-code"></i> html </a> <a class="btn btn-primary btn-sm" download="rfc1784.pdf" target="_blank" href="https://www.rfc-editor.org/rfc/pdfrfc/rfc1784.txt.pdf"> <i class="bi bi-file-pdf"></i> pdf </a> <a class="btn btn-primary btn-sm" target="_blank" href="/doc/rfc1784/bibtex/"> <i class="bi bi-file-ruled"></i> bibtex </a> </div> </td> </tr> <tr> <td> </td> <th scope="row"> Additional resources </th> <td class="edit"> </td> <td> onet2.cup.hp.com%3A/dist/tftpexts/tftpexts_archive </td> </tr> </tbody> <tr> <th scope="row"></th> <th scope="row"></th> <td class="edit"></td> <td> <a class="btn btn-sm btn-warning mb-3" target="_blank" href="https://github.com/ietf-tools/datatracker/issues/new/choose"> Report a bug <i class="bi bi-bug"></i> </a> </td> </tr> </table> </div> </div> </nav> <div class="row g-0"> <div class="col-md-9 d-flex justify-content-center lh-sm" data-bs-spy="scroll" data-bs-target="#toc-nav" data-bs-smooth-scroll="true" tabindex="0" id="content"> <div class="rfcmarkup"> <br class="noprint">  <div class="rfcmarkup"><pre>Network Working Group G. Malkin Request for Comments: 1784 Xylogics, Inc. Updates: <a href="/doc/html/rfc1350">1350</a> A. Harkin Category: Standards Track Hewlett Packard Co. March 1995 <span class="h1">TFTP Timeout Interval and Transfer Size Options</span> Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Abstract The Trivial File Transfer Protocol [<a href="#ref-1" title=""The TFTP Protocol (Revision 2)"">1</a>] is a simple, lock-step, file transfer protocol which allows a client to get or put a file onto a remote host. This document describes two TFTP options. The first allows the client and server to negotiate the Timeout Interval. The second allows the side receiving the file to determine the ultimate size of the transfer before it begins. The TFTP Option Extension mechanism is described in [<a href="#ref-2" title=""TFTP Option Extension"">2</a>]. This document assumes that the reader is familiar with the terminology and notation of both [<a href="#ref-1" title=""The TFTP Protocol (Revision 2)"">1</a>] and [<a href="#ref-2" title=""TFTP Option Extension"">2</a>]. Timeout Interval Option Specification The TFTP Read Request or Write Request packet is modified to include the timeout option as follows: +-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+ | opc |filename| 0 | mode | 0 | timeout| 0 | #secs | 0 | +-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+ opc The opcode field contains either a 1, for Read Requests, or 2, for Write Requests, as defined in [<a href="#ref-1" title=""The TFTP Protocol (Revision 2)"">1</a>]. filename The name of the file to be read or written, as defined in [<a href="#ref-1" title=""The TFTP Protocol (Revision 2)"">1</a>]. This is a NULL-terminated field. <span class="grey">Malkin & Harkin [Page 1]</span></pre> <hr class='noprint'/><pre class='newpage'><span id="page-2" ></span> <span class="grey"><a href="/doc/html/rfc1784">RFC 1784</a> TFTP Options March 1995</span> mode The mode of the file transfer: "netascii", "octet", or "mail", as defined in [<a href="#ref-1" title=""The TFTP Protocol (Revision 2)"">1</a>]. This is a NULL-terminated field. timeout The Timeout Interval option, "timeout" (case insensitive). This is a NULL-terminated field. #secs The number of seconds to wait before retransmitting, specified in ASCII. Valid values range between "1" and "255" octets, inclusive. This is a NULL-terminated field. For example: +-------+--------+---+--------+---+--------+---+--------+---+ | 1 | foobar | 0 | binary | 0 | timeout| 0 | 1 | 0 | +-------+--------+---+--------+---+--------+---+--------+---+ is a Read Request, for the file named "foobar", in binary transfer mode, with a timeout interval of 1 second. If the server is willing to accept the timeout option, it sends an Option Acknowledgment (OACK) to the client. The specified timeout value must match the value specified by the client. Transfer Size Option Specification The TFTP Read Request or Write Request packet is modified to include the tsize option as follows: +-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+ | opc |filename| 0 | mode | 0 | tsize | 0 | size | 0 | +-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+ opc The opcode field contains either a 1, for Read Requests, or 2, for Write Requests, as defined in [<a href="#ref-1" title=""The TFTP Protocol (Revision 2)"">1</a>]. filename The name of the file to be read or written, as defined in [<a href="#ref-1" title=""The TFTP Protocol (Revision 2)"">1</a>]. This is a NULL-terminated field. mode The mode of the file transfer: "netascii", "octet", or "mail", as defined in [<a href="#ref-1" title=""The TFTP Protocol (Revision 2)"">1</a>]. This is a NULL-terminated field. <span class="grey">Malkin & Harkin [Page 2]</span></pre> <hr class='noprint'/><pre class='newpage'><span id="page-3" ></span> <span class="grey"><a href="/doc/html/rfc1784">RFC 1784</a> TFTP Options March 1995</span> tsize The Transfer Size option, "tsize" (case insensitive). This is a NULL-terminated field. size The size of the file to be transfered, specified as a NULL-terminated ASCII string. For example: +-------+--------+---+--------+---+--------+---+--------+---+ | 2 | foobar | 0 | binary | 0 | tsize | 0 | 673312 | 0 | +-------+--------+---+--------+---+--------+---+--------+---+ is a Write Request, with the 673312-octet file named "foobar", in binary transfer mode. In Read Request packets, a size of "0" is specified in the request and the size of the file, in octets, is returned in the OACK. If the file is too large for the client to handle, it may abort the transfer with an Error packet (error code 3). In Write Request packets, the size of the file, in octets, is specified in the request and echoed back in the OACK. If the file is too large for the server to handle, it may abort the transfer with an Error packet (error code 3). Security Considerations Security issues are not discussed in this memo. References [<a id="ref-1">1</a>] Sollins, K., "The TFTP Protocol (Revision 2)", STD 33, <a href="/doc/html/rfc1350">RFC 1350</a>, MIT, July 1992. [<a id="ref-2">2</a>] Malkin, G., and A. Harkin, "TFTP Option Extension", <a href="/doc/html/rfc1782">RFC 1782</a>, Xylogics, Inc., Hewlett Packard Co., March 1995. <span class="grey">Malkin & Harkin [Page 3]</span></pre> <hr class='noprint'/><pre class='newpage'><span id="page-4" ></span> <span class="grey"><a href="/doc/html/rfc1784">RFC 1784</a> TFTP Options March 1995</span> Authors' Addresses Gary Scott Malkin Xylogics, Inc. 53 Third Avenue Burlington, MA 01803 Phone: (617) 272-8140 EMail: gmalkin@xylogics.com Art Harkin Internet Services Project Information Networks Division 19420 Homestead Road MS 43LN Cupertino, CA 95014 Phone: (408) 447-3755 EMail: ash@cup.hp.com Malkin & Harkin [Page 4] </pre></div> </div> </div> <div class="d-print-none col-md-3 bg-light-subtle collapse show" id="sidebar"> <div class="position-fixed border-start sidebar overflow-scroll overscroll-none no-scrollbar"> <div class="d-flex flex-column vh-100 pt-2 pt-lg-3 ps-3 pl-md-2 pl-lg-3"> <div> <a class="btn btn-primary btn-sm" href="/doc/rfc1784/">Datatracker</a> <p class="fw-bold pt-2"> RFC 1784 <br> <span class="text-success">RFC - Proposed Standard </span> </p> </div> <ul class="nav nav-tabs nav-fill small me-2" role="tablist"> <li class="nav-item" role="presentation" title="Document information"> <button class="nav-link px-2" id="docinfo-tab" data-bs-toggle="tab" data-bs-target="#docinfo-tab-pane" type="button" role="tab" aria-controls="docinfo-tab-pane" aria-selected="true"> <i class="bi bi-info-circle"></i><span class="d-none d-md-block d-xl-inline ms-xl-1">Info</span> </button> </li> <li class="nav-item" role="presentation" title="Table of contents"> <button class="nav-link px-2" id="toc-tab" data-bs-toggle="tab" data-bs-target="#toc-tab-pane" type="button" role="tab" aria-controls="toc-tab-pane" aria-selected="false"> <i class="bi bi-list-ol"></i><span class="d-none d-md-block d-xl-inline ms-xl-1">Contents</span> </button> </li> <li class="nav-item" role="presentation" title="Preferences"> <button class="nav-link px-2" id="pref-tab" data-bs-toggle="tab" data-bs-target="#pref-tab-pane" type="button" role="tab" aria-controls="pref-tab-pane" aria-selected="false"> <i class="bi bi-gear"></i><span class="d-none d-md-block d-xl-inline ms-xl-1">Prefs</span> </button> </li> </ul> <div class="overflow-auto tab-content pt-2 me-2"> <div class="tab-pane" id="docinfo-tab-pane" role="tabpanel" aria-labelledby="docinfo-tab" tabindex="0"> <table class="table table-sm table-borderless"> <tbody class="meta align-top "> <tr> <th scope="row">Document</th> <th scope="row">Document type</th> <td class="edit"></td> <td> <span class="text-success">RFC - Proposed Standard </span> <br>March 1995 <br> <a class="btn btn-sm btn-warning" title="Click to report an error in the document." href="https://www.rfc-editor.org/errata.php#reportnew" target="_blank"> Report errata </a> <div>Obsoleted by <a href="/doc/html/rfc2349" title="TFTP Timeout Interval and Transfer Size Options">RFC 2349</a></div> <div>Updates <a href="/doc/html/rfc1350" title="The TFTP Protocol (Revision 2)">RFC 1350</a></div> <div> Was <a href="/doc/draft-ietf-tftpexts-options/00/">draft-ietf-tftpexts-options</a> (<a href="/wg/tftpexts/about/">tftpexts WG</a>) </div> </td> </tr> <tr> <td></td> <th scope="row">Select version</th> <td class="edit"></td> <td> <ul class="revision-list pagination pagination-sm text-center flex-wrap my-0"> <li class="page-item"> <a class="page-link" href="/doc/html/draft-ietf-tftpexts-options-00" rel="nofollow"> 00 </a> </li> <li class="page-item rfc active"> <a class="page-link" href="/doc/html/rfc1784"> RFC 1784 </a> </li> </ul> </td> </tr> <tr> <td></td> <th scope="row">Compare versions</th> <td class="edit"></td> <td> <form class="form-horizontal diff-form" action="https://author-tools.ietf.org/iddiff" method="get" target="_blank"> <select class="form-select form-select-sm mb-1 select2-field" data-max-entries="1" data-width="resolve" data-allow-clear="false" data-minimum-input-length="0" aria-label="From revision" name="url1"> <option value="rfc1784"> RFC 1784 </option> <option value="draft-ietf-tftpexts-options-00" selected> draft-ietf-tftpexts-options-00 </option> </select> <select class="form-select form-select-sm mb-1 select2-field" data-max-entries="1" data-width="resolve" data-allow-clear="false" data-minimum-input-length="0" aria-label="To revision" name="url2"> <option value="rfc1784" selected> RFC 1784 </option> <option value="draft-ietf-tftpexts-options-00"> draft-ietf-tftpexts-options-00 </option> </select> <button type="submit" class="btn btn-primary btn-sm" value="--html" name="difftype"> Side-by-side </button> <button type="submit" class="btn btn-primary btn-sm" value="--hwdiff" name="difftype"> Inline </button> </form> </td> </tr> <tr> <td></td> <th scope="row">Authors</th> <td class="edit"> </td> <td> <span ><a title="Datatracker profile of Gary S. 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Malkin</a> <a href="mailto:gmalkin%40baynetworks.com" aria-label="Compose email to gmalkin@baynetworks.com" title="Compose email to gmalkin@baynetworks.com"> <i class="bi bi-envelope"></i></a></span>, <span ><a title="Datatracker profile of Art Harkin" href="/person/ash@cup.hp.com" >Art Harkin</a> <a href="mailto:ash%40cup.hp.com" aria-label="Compose email to ash@cup.hp.com" title="Compose email to ash@cup.hp.com"> <i class="bi bi-envelope"></i></a></span> <br> <a class="btn btn-primary btn-sm mt-1" href="mailto:rfc1784@ietf.org?subject=rfc1784" title="Send email to the document authors">Email authors</a> </td> </tr> <tr> <td></td> <th scope="row"> RFC stream </th> <td class="edit"> </td> <td > <img alt="IETF Logo" class="d-lm-none w-25 mt-1" src="https://static.ietf.org/dt/12.37.0/ietf/images/ietf-logo-nor-white.svg" > <img alt="IETF Logo" class="d-dm-none w-25 mt-1" src="https://static.ietf.org/dt/12.37.0/ietf/images/ietf-logo-nor.svg" > </td> </tr> <tr> <td></td> <th scope="row"> Other formats </th> <td class="edit"> </td> <td> <div class="buttonlist"> <a class="btn btn-primary btn-sm" target="_blank" href="https://www.rfc-editor.org/rfc/rfc1784.txt"> <i class="bi bi-file-text"></i> txt </a> <a class="btn btn-primary btn-sm" target="_blank" href="https://www.rfc-editor.org/rfc/rfc1784.html"> <i class="bi bi-file-code"></i> html </a> <a class="btn btn-primary btn-sm" download="rfc1784.pdf" target="_blank" href="https://www.rfc-editor.org/rfc/pdfrfc/rfc1784.txt.pdf"> <i class="bi bi-file-pdf"></i> pdf </a> <a class="btn btn-primary btn-sm" target="_blank" href="/doc/rfc1784/bibtex/"> <i class="bi bi-file-ruled"></i> bibtex </a> </div> </td> </tr> <tr> <td> </td> <th scope="row"> Additional resources </th> <td class="edit"> </td> <td> onet2.cup.hp.com%3A/dist/tftpexts/tftpexts_archive </td> </tr> </tbody> </table> <a class="btn btn-sm btn-warning mb-3" target="_blank" href="https://github.com/ietf-tools/datatracker/issues/new/choose"> Report a datatracker bug <i class="bi bi-bug"></i> </a> </div> <div class="tab-pane mb-5" id="toc-tab-pane" role="tabpanel" aria-labelledby="toc-tab" tabindex="0"> <nav class="nav nav-pills flex-column small" id="toc-nav"> </nav> </div> <div class="tab-pane mb-5 small" id="pref-tab-pane" role="tabpanel" aria-labelledby="pref-tab" tabindex="0"> <label class="form-label fw-bold mb-2">Show sidebar by default</label> <div class="btn-group-vertical btn-group-sm d-flex" role="group"> <input type="radio" class="btn-check" name="sidebar" id="on-radio"> <label class="btn btn-outline-primary" for="on-radio">Yes</label> <input type="radio" class="btn-check" name="sidebar" id="off-radio"> <label class="btn btn-outline-primary" for="off-radio">No</label> </div> <label class="form-label fw-bold mt-4 mb-2">Tab to show by default</label> <div class="btn-group-vertical btn-group-sm d-flex" role="group"> <input type="radio" class="btn-check" name="deftab" id="docinfo-radio"> <label class="btn btn-outline-primary" for="docinfo-radio"> <i class="bi bi-info-circle me-1"></i>Info </label> <input type="radio" class="btn-check" name="deftab" id="toc-radio"> <label class="btn btn-outline-primary" for="toc-radio"> <i class="bi bi-list-ol me-1"></i>Contents </label> </div> <label class="form-label fw-bold mt-4 mb-2">HTMLization configuration</label> <div class="btn-group-vertical btn-group-sm d-flex" role="group"> <input type="radio" class="btn-check" name="htmlconf" id="txt-radio"> <label class="btn btn-outline-primary" for="txt-radio" title="This is the traditional HTMLization method."> <i class="bi bi-badge-sd me-1"></i>HTMLize the plaintext </label> <input type="radio" class="btn-check" name="htmlconf" id="html-radio"> <label class="btn btn-outline-primary" for="html-radio" title="This is the modern HTMLization method."> <i class="bi bi-badge-hd me-1"></i>Plaintextify the HTML </label> </div> <label class="form-label fw-bold mt-4 mb-2" for="ptsize">Maximum font size</label> <input type="range" class="form-range" min="7" max="16" id="ptsize" oninput="ptdemo.value = ptsize.value"> <label class="form-label fw-bold mt-4 mb-2">Page dependencies</label> <div class="btn-group-vertical btn-group-sm d-flex" role="group"> <input type="radio" class="btn-check" name="pagedeps" id="inline-radio"> <label class="btn btn-outline-primary" for="inline-radio" title="Generate larger, standalone web pages that do not require network access to render."> <i class="bi bi-box me-1"></i>Inline </label> <input type="radio" class="btn-check" name="pagedeps" id="reference-radio"> <label class="btn btn-outline-primary" for="reference-radio" title="Generate regular web pages that require network access to render."> <i class="bi bi-link-45deg me-1"></i>Reference </label> </div> <label class="form-label fw-bold mt-4 mb-2">Citation links</label> <div class="btn-group-vertical btn-group-sm d-flex" role="group"> <input type="radio" class="btn-check" name="reflinks" id="refsection-radio"> <label class="btn 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RFC 1784 - TFTP Timeout Interval and Transfer Size Options