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authorPéter Dimitrov <[email protected]>2018-03-20 11:26:01 +0100
committerPéter Dimitrov <[email protected]>2018-03-28 10:19:38 +0200
commit09ccfa2a6a8f8df55c7d808f5ad26324ac1e81b6 (patch)
treedb6e9a1172ee8bb761041e352b6dc637fd765d28 /lib/tftp/doc/src
parent3c41882115f2cd9bfda8318925b4352cd1ec06b7 (diff)
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inets,tftp: Break out TFTP from inets
- Create directory structure - Move code, tests, documentation from inets - Add inets_tftp_wrapper - Add tftp app to run-dialyzer script Change-Id: I6a142ae66cecb9a1821cbf9ea6a45f66a836763d
Diffstat (limited to 'lib/tftp/doc/src')
-rw-r--r--lib/tftp/doc/src/Makefile153
-rw-r--r--lib/tftp/doc/src/book.xml49
-rw-r--r--lib/tftp/doc/src/introduction.xml46
-rw-r--r--lib/tftp/doc/src/notes.xml53
-rw-r--r--lib/tftp/doc/src/part.xml36
-rw-r--r--lib/tftp/doc/src/ref_man.xml36
-rw-r--r--lib/tftp/doc/src/tftp.xml643
7 files changed, 1016 insertions, 0 deletions
diff --git a/lib/tftp/doc/src/Makefile b/lib/tftp/doc/src/Makefile
new file mode 100644
index 0000000000..cd97bdf7ff
--- /dev/null
+++ b/lib/tftp/doc/src/Makefile
@@ -0,0 +1,153 @@
+#
+# %CopyrightBegin%
+#
+# Copyright Ericsson AB 1997-2018. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# %CopyrightEnd%
+#
+#
+include $(ERL_TOP)/make/target.mk
+include $(ERL_TOP)/make/$(TARGET)/otp.mk
+
+# ----------------------------------------------------
+# Application version
+# ----------------------------------------------------
+include ../../vsn.mk
+VSN=$(TFTP_VSN)
+
+# ----------------------------------------------------
+# Release directory specification
+# ----------------------------------------------------
+RELSYSDIR = $(RELEASE_PATH)/lib/$(APPLICATION)-$(VSN)
+
+
+# ----------------------------------------------------
+# Target Specs
+# ----------------------------------------------------
+XML_APPLICATION_FILES = ref_man.xml
+
+XML_CHAPTER_FILES = \
+ introduction.xml \
+ notes.xml
+
+XML_REF3_FILES = \
+ tftp.xml
+
+XML_PART_FILES = \
+ part.xml
+
+BOOK_FILES = book.xml
+
+XML_FILES = \
+ $(BOOK_FILES) \
+ $(XML_CHAPTER_FILES) \
+ $(XML_PART_FILES) \
+ $(XML_REF6_FILES) \
+ $(XML_REF3_FILES) \
+ $(XML_APPLICATION_FILES)
+
+# GIF_FILES = tftp.gif
+
+
+# ----------------------------------------------------
+
+HTML_FILES = \
+ $(XML_APPLICATION_FILES:%.xml=$(HTMLDIR)/%.html) \
+ $(XML_PART_FILES:%.xml=$(HTMLDIR)/%.html)
+
+INFO_FILE = ../../info
+EXTRA_FILES = \
+ $(XML_REF3_FILES:%.xml=$(HTMLDIR)/%.html) \
+ $(XML_REF6_FILES:%.xml=$(HTMLDIR)/%.html) \
+ $(XML_CHAPTER_FILES:%.xml=$(HTMLDIR)/%.html)
+
+MAN3_FILES = $(XML_REF3_FILES:%.xml=$(MAN3DIR)/%.3)
+
+HTML_REF_MAN_FILE = $(HTMLDIR)/index.html
+
+TOP_PDF_FILE = $(PDFDIR)/$(APPLICATION)-$(VSN).pdf
+
+# ----------------------------------------------------
+# FLAGS
+# ----------------------------------------------------
+XML_FLAGS +=
+DVIPS_FLAGS +=
+
+# ----------------------------------------------------
+# Targets
+# ----------------------------------------------------
+$(HTMLDIR)/%.gif: %.gif
+ $(INSTALL_DATA) $< $@
+
+docs: pdf html man
+
+ldocs: local_docs
+
+$(TOP_PDF_FILE): $(XML_FILES)
+
+pdf: $(TOP_PDF_FILE)
+
+html: gifs $(HTML_REF_MAN_FILE)
+
+clean clean_docs: clean_html clean_man clean_pdf
+ rm -f errs core *~
+
+man: $(MAN3_FILES)
+
+gifs: $(GIF_FILES:%=$(HTMLDIR)/%)
+
+debug opt:
+
+clean_pdf:
+ rm -f $(TOP_PDF_FILE) $(TOP_PDF_FILE:%.pdf=%.fo)
+
+clean_html:
+ rm -rf $(TOP_HTML_FILES) $(HTMLDIR)/*
+
+clean_man:
+ rm -f $(MAN3_FILES)
+
+
+# ----------------------------------------------------
+# Release Target
+# ----------------------------------------------------
+include $(ERL_TOP)/make/otp_release_targets.mk
+
+release_docs_spec: docs
+ $(INSTALL_DIR) "$(RELSYSDIR)/doc/pdf"
+ $(INSTALL_DATA) $(TOP_PDF_FILE) "$(RELSYSDIR)/doc/pdf"
+ $(INSTALL_DIR) "$(RELSYSDIR)/doc/html"
+ $(INSTALL_DATA) $(HTMLDIR)/* "$(RELSYSDIR)/doc/html"
+ $(INSTALL_DATA) $(INFO_FILE) "$(RELSYSDIR)"
+ $(INSTALL_DIR) "$(RELEASE_PATH)/man/man3"
+ $(INSTALL_DATA) $(MAN3DIR)/* "$(RELEASE_PATH)/man/man3"
+
+release_spec:
+
+info:
+ @echo "GIF_FILES:\n$(GIF_FILES)"
+ @echo ""
+ @echo "EXTRA_FILES:\n$(EXTRA_FILES)"
+ @echo ""
+ @echo "HTML_FILES:\n$(HTML_FILES)"
+ @echo ""
+ @echo "TOP_HTML_FILES:\n$(TOP_HTML_FILES)"
+ @echo ""
+ @echo "XML_REF3_FILES:\n$(XML_REF3_FILES)"
+ @echo ""
+ @echo "XML_REF6_FILES:\n$(XML_REF6_FILES)"
+ @echo ""
+ @echo "XML_CHAPTER_FILES:\n$(XML_CHAPTER_FILES)"
+ @echo ""
diff --git a/lib/tftp/doc/src/book.xml b/lib/tftp/doc/src/book.xml
new file mode 100644
index 0000000000..cf8032a4e9
--- /dev/null
+++ b/lib/tftp/doc/src/book.xml
@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE book SYSTEM "book.dtd">
+
+<book xmlns:xi="http://www.w3.org/2001/XInclude">
+ <header titlestyle="normal">
+ <copyright>
+ <year>1997</year><year>2018</year>
+ <holder>Ericsson AB. All Rights Reserved.</holder>
+ </copyright>
+ <legalnotice>
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+ </legalnotice>
+
+ <title>TFTP</title>
+ <prepared>Péter Dimitrov</prepared>
+ <docno></docno>
+ <date>2018-03-22</date>
+ <rev>1.0</rev>
+ <file>book.sgml</file>
+ </header>
+ <insidecover>
+ </insidecover>
+ <pagetext>TFTP</pagetext>
+ <preamble>
+ <contents level="2"></contents>
+ </preamble>
+ <parts lift="no">
+ <xi:include href="part.xml"/>
+ </parts>
+ <applications>
+ <xi:include href="ref_man.xml"/>
+ </applications>
+ <releasenotes>
+ <xi:include href="notes.xml"/>
+ </releasenotes>
+ <listofterms></listofterms>
+ <index></index>
+</book>
diff --git a/lib/tftp/doc/src/introduction.xml b/lib/tftp/doc/src/introduction.xml
new file mode 100644
index 0000000000..949438ae92
--- /dev/null
+++ b/lib/tftp/doc/src/introduction.xml
@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE chapter SYSTEM "chapter.dtd">
+
+<chapter>
+ <header>
+ <copyright>
+ <year>1997</year><year>2018</year>
+ <holder>Ericsson AB. All Rights Reserved.</holder>
+ </copyright>
+ <legalnotice>
+ The contents of this file are subject to the Erlang Public License,
+ Version 1.1, (the "License"); you may not use this file except in
+ compliance with the License. You should have received a copy of the
+ Erlang Public License along with this software. If not, it can be
+ retrieved online at http://www.erlang.org/.
+
+ Software distributed under the License is distributed on an "AS IS"
+ basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ the License for the specific language governing rights and limitations
+ under the License.
+
+ </legalnotice>
+
+ <title>Introduction</title>
+ <prepared>Péter Dimitrov</prepared>
+ <responsible></responsible>
+ <docno></docno>
+ <approved></approved>
+ <checked></checked>
+ <date>2018-03-22</date>
+ <rev>A</rev>
+ <file>introduction.xml</file>
+ </header>
+
+ <section>
+ <title>Purpose</title>
+ <p>A <c>TFTP</c> client and server.</p>
+ </section>
+
+ <section>
+ <title>Prerequisites</title>
+ <p>It is assumed that the reader is familiar with the Erlang
+ programming language, concepts of OTP, and has a basic
+ understanding of the TFTP protocol.</p>
+ </section>
+</chapter>
diff --git a/lib/tftp/doc/src/notes.xml b/lib/tftp/doc/src/notes.xml
new file mode 100644
index 0000000000..f7525c8f3e
--- /dev/null
+++ b/lib/tftp/doc/src/notes.xml
@@ -0,0 +1,53 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE chapter SYSTEM "chapter.dtd">
+
+<chapter>
+ <header>
+ <copyright>
+ <year>2002</year><year>2018</year>
+ <holder>Ericsson AB. All Rights Reserved.</holder>
+ </copyright>
+ <legalnotice>
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+ </legalnotice>
+
+ <title>TFTP Release Notes</title>
+ <prepared></prepared>
+ <responsible></responsible>
+ <docno></docno>
+ <approved></approved>
+ <checked></checked>
+ <date>2018-03-22</date>
+ <rev>A</rev>
+ <file>notes.xml</file>
+ </header>
+
+ <section><title>TFTP 1.0.0</title>
+
+ <section><title>First released version</title>
+ <list>
+ <item>
+ <p>
+ Inets application was split into multiple smaller protocol specific applications.
+ The TFTP application is a standalone TFTP client and server with the same functionality as
+ TFTP in Inets.</p>
+ <p>
+ Own Id: OTP-14113</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+</chapter>
diff --git a/lib/tftp/doc/src/part.xml b/lib/tftp/doc/src/part.xml
new file mode 100644
index 0000000000..abbe0edcbf
--- /dev/null
+++ b/lib/tftp/doc/src/part.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE part SYSTEM "part.dtd">
+
+<part xmlns:xi="http://www.w3.org/2001/XInclude">
+ <header>
+ <copyright>
+ <year>2004</year><year>2018</year>
+ <holder>Ericsson AB. All Rights Reserved.</holder>
+ </copyright>
+ <legalnotice>
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+ </legalnotice>
+
+ <title>TFTP User's Guide</title>
+ <prepared>Péter Dimitrov</prepared>
+ <docno></docno>
+ <date>2018-03-22</date>
+ <rev>A</rev>
+ <file>part.sgml</file>
+ </header>
+ <description>
+ <p>The <c>TFTP</c> application provides a TFTP client and server.</p>
+ </description>
+ <xi:include href="introduction.xml"/>
+</part>
diff --git a/lib/tftp/doc/src/ref_man.xml b/lib/tftp/doc/src/ref_man.xml
new file mode 100644
index 0000000000..41a6cc6d52
--- /dev/null
+++ b/lib/tftp/doc/src/ref_man.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE application SYSTEM "application.dtd">
+
+<application xmlns:xi="http://www.w3.org/2001/XInclude">
+ <header>
+ <copyright>
+ <year>1997</year><year>2018</year>
+ <holder>Ericsson AB. All Rights Reserved.</holder>
+ </copyright>
+ <legalnotice>
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+ </legalnotice>
+
+ <title>TFTP Reference Manual</title>
+ <prepared>Péter Dimitrov</prepared>
+ <docno></docno>
+ <date>2018-03-22</date>
+ <rev>1.0</rev>
+ <file>ref_man.xml</file>
+ </header>
+ <description>
+ <p>The <c>TFTP</c> application.</p>
+ </description>
+ <xi:include href="tftp.xml"/>
+</application>
diff --git a/lib/tftp/doc/src/tftp.xml b/lib/tftp/doc/src/tftp.xml
new file mode 100644
index 0000000000..c4d6a4e6d0
--- /dev/null
+++ b/lib/tftp/doc/src/tftp.xml
@@ -0,0 +1,643 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE erlref SYSTEM "erlref.dtd">
+
+<erlref>
+ <header>
+ <copyright>
+ <year>2006</year><year>2018</year>
+ <holder>Ericsson AB. All Rights Reserved.</holder>
+ </copyright>
+ <legalnotice>
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+ </legalnotice>
+
+ <title>tftp</title>
+ <prepared></prepared>
+ <docno></docno>
+ <date></date>
+ <rev></rev>
+ </header>
+ <module>tftp</module>
+ <modulesummary>Trivial FTP.</modulesummary>
+ <description>
+ <p>This is a complete implementation of the following IETF standards:</p>
+ <list type="bulleted">
+ <item>RFC 1350, The TFTP Protocol (revision 2)</item>
+ <item>RFC 2347, TFTP Option Extension</item>
+ <item>RFC 2348, TFTP Blocksize Option</item>
+ <item>RFC 2349, TFTP Timeout Interval and Transfer Size Options</item>
+ </list>
+ <p>The only feature that not is implemented is
+ the "netascii" transfer mode.</p>
+ <p>The <seealso marker="#start/1">start/1</seealso> function starts
+ a daemon process listening for UDP packets on a port. When it
+ receives a request for read or write, it spawns a temporary server
+ process handling the transfer.</p>
+ <p>On the client side,
+ function <seealso marker="#read_file/3">read_file/3</seealso>
+ and <seealso marker="#write_file/3">write_file/3</seealso>
+ spawn a temporary client process establishing
+ contact with a TFTP daemon and perform the file transfer.</p>
+ <p><c>tftp</c> uses a callback module to handle the file
+ transfer. Two such callback modules are provided,
+ <c>tftp_binary</c> and <c>tftp_file</c>. See
+ <seealso marker="#read_file/3">read_file/3</seealso> and
+ <seealso marker="#write_file/3">write_file/3</seealso> for details.
+ You can also implement your own callback modules, see
+ <seealso marker="#tftp_callback">CALLBACK FUNCTIONS</seealso>.
+ A callback module provided by
+ the user is registered using option <c>callback</c>, see
+ <seealso marker="#options">DATA TYPES</seealso>.</p>
+ </description>
+
+ <section>
+ <title>TFTP SERVER SERVICE START/STOP</title>
+
+ <p>A TFTP server can be started dynamically
+ (when <c>tftp</c> is already started) by calling the <c>tftp</c> application
+ API <c>tftp:start(ServiceConfig)</c>.
+ The <c>ServiceConfig</c> for TFTP is described in
+ the <seealso marker="#options">DATA TYPES</seealso>
+ section.</p>
+
+ <p>The TFTP server can be stopped using <c>tftp:stop_service(Pid)</c>.</p>
+
+ <p>The TPFT client is of such a temporary nature that it is not
+ handled as a service in the <c>tftp</c> service framework.</p>
+
+ </section>
+
+ <section>
+ <marker id="options"></marker>
+ <title>DATA TYPES</title>
+ <p><c>ServiceConfig = Options</c></p>
+ <p><c>Options = [option()]</c></p>
+ <p>Most of the options are common for both the client and the server
+ side, but some of them differs a little.
+ The available <c>option()</c>s are as follows:</p>
+ <taglist>
+ <tag><c>{debug, Level}</c></tag>
+ <item>
+ <p><c>Level = none | error | warning | brief | normal | verbose | all</c></p>
+ <p>Controls the level of debug printouts.
+ Default is <c>none</c>.</p>
+ </item>
+ <tag><c>{host, Host}</c></tag>
+ <item>
+ <p><c>Host = hostname()</c>, see
+ <seealso marker="kernel:inet">inet(3)</seealso>.</p>
+ <p>The name or IP address of the host where the TFTP daemon
+ resides. This option is only used by the client.</p>
+ </item>
+ <tag><c>{port, Port}</c></tag>
+ <item>
+ <p><c>Port = int()</c></p>
+ <p>The TFTP port where the daemon listens. Defaults is
+ the standardized number 69. On the server side, it can
+ sometimes make sense to set it to 0, meaning that
+ the daemon just picks a free port (which one is
+ returned by function <c>info/1</c>).</p>
+ <p>If a socket is connected already, option
+ <c>{udp, [{fd, integer()}]}</c> can be used to pass the
+ open file descriptor to <c>gen_udp</c>. This can be automated
+ by using a command-line argument stating the
+ prebound file descriptor number. For example, if the
+ port is 69 and file descriptor 22 is opened by
+ <c>setuid_socket_wrap</c>, the command-line argument
+ "-tftpd_69 22" triggers the prebound file
+ descriptor 22 to be used instead of opening port 69.
+ The UDP option <c>{udp, [{fd, 22}]}</c> is automatically added.
+ See <c>init:get_argument/</c> about command-line arguments and
+ <c>gen_udp:open/2</c> about UDP options.</p>
+ </item>
+ <tag><c>{port_policy, Policy}</c></tag>
+ <item>
+ <p><c>Policy = random | Port | {range, MinPort, MaxPort}</c></p>
+ <p><c>Port = MinPort = MaxPort = int()</c></p>
+ <p>Policy for the selection of the temporary port that is used
+ by the server/client during the file transfer. Default is
+ <c>random</c>, which is the standardized policy. With this
+ policy a randomized free port is used. A single port or a range
+ of ports can be useful if the protocol passes through a
+ firewall.</p>
+ </item>
+ <tag><c>{udp, Options}</c></tag>
+ <item>
+ <p><c>Options = [Opt]</c>, see
+ <seealso marker="kernel:gen_udp#open/1">gen_udp:open/2</seealso>.</p>
+ </item>
+ <tag><c>{use_tsize, Bool}</c></tag>
+ <item>
+ <p><c>Bool = bool()</c></p>
+ <p>Flag for automated use of option <c>tsize</c>. With
+ this set to <c>true</c>, the <c>write_file/3</c> client
+ determines the filesize and sends it to the server as
+ the standardized <c>tsize</c> option. A <c>read_file/3</c>
+ client acquires only a filesize from the server by sending
+ a zero <c>tsize</c>.</p>
+ </item>
+ <tag><c>{max_tsize, MaxTsize}</c></tag>
+ <item>
+ <p><c>MaxTsize = int() | infinity</c></p>
+ <p>Threshold for the maximal filesize in bytes. The transfer
+ is aborted if the limit is exceeded.
+ Default is <c>infinity</c>.</p>
+ </item>
+ <tag><c>{max_conn, MaxConn}</c></tag>
+ <item>
+ <p><c>MaxConn = int() | infinity</c></p>
+ <p>Threshold for the maximal number of active connections.
+ The daemon rejects the setup of new connections if
+ the limit is exceeded. Default is <c>infinity</c>.</p>
+ </item>
+ <tag><c>{TftpKey, TftpVal}</c></tag>
+ <item>
+ <p><c>TftpKey = string()</c> <br></br>
+<c>TftpVal = string()</c></p>
+ <p>Name and value of a TFTP option.</p>
+ </item>
+ <tag><c>{reject, Feature}</c></tag>
+ <item>
+ <p><c>Feature = Mode | TftpKey</c> <br></br>
+<c>&nbsp;Mode = read | write</c> <br></br>
+<c>&nbsp;TftpKey = string()</c></p>
+ <p>Controls which features to reject. This is
+ mostly useful for the server as it can restrict the use
+ of certain TFTP options or read/write access.</p>
+ </item>
+ <tag><c>{callback, {RegExp, Module, State}}</c></tag>
+ <item>
+ <p><c>RegExp = string()</c> <br></br>
+<c>Module = atom()</c> <br></br>
+<c>State = term()</c></p>
+ <p>Registration of a callback module. When a file is to be
+ transferred, its local filename is matched to the regular
+ expressions of the registered callbacks. The first matching
+ callback is used during the transfer. See
+ <seealso marker="#read_file/3">read_file/3</seealso> and
+ <seealso marker="#write_file/3">write_file/3</seealso>.
+ </p>
+ <p>The callback module must implement the <c>tftp</c> behavior, see
+ <seealso marker="#tftp_callback">CALLBACK FUNCTIONS</seealso>.</p>
+ </item>
+
+ <tag><c>{logger, Module}</c></tag>
+ <item>
+ <p><c>Module = module()()</c></p>
+
+ <p>Callback module for customized logging of errors, warnings, and
+ info messages. The callback module must implement the
+ <c>tftp_logger</c> behavior, see
+ <seealso marker="#tftp_logger">LOGGER FUNCTIONS</seealso>.
+ The default module is <c>tftp_logger</c>.</p>
+ </item>
+
+ <tag><c>{max_retries, MaxRetries}</c></tag>
+ <item>
+ <p><c>MaxRetries = int()</c></p>
+
+ <p>Threshold for the maximal number of retries. By default
+ the server/client tries to resend a message up to
+ five times when the time-out expires.</p>
+ </item>
+ </taglist>
+ </section>
+
+ <funcs>
+ <func>
+ <name>change_config(daemons, Options) -> [{Pid, Result}]</name>
+ <fsummary>Changes configuration for all daemons.
+ </fsummary>
+ <type>
+ <v>Options = [option()]</v>
+ <v>Pid = pid()</v>
+ <v>Result = ok | {error, Reason}</v>
+ <v>Reason = term()</v>
+ </type>
+ <desc>
+ <p>Changes configuration for all TFTP daemon processes. </p>
+ </desc>
+ </func>
+
+ <func>
+ <name>change_config(servers, Options) -> [{Pid, Result}]</name>
+ <fsummary>Changes configuration for all servers.
+ </fsummary>
+ <type>
+ <v>Options = [option()]</v>
+ <v>Pid = pid()</v>
+ <v>Result = ok | {error, Reason}</v>
+ <v>Reason = term()</v>
+ </type>
+ <desc>
+ <p>Changes configuration for all TFTP server processes.</p>
+ </desc>
+ </func>
+
+ <func>
+ <name>change_config(Pid, Options) -> Result</name>
+ <fsummary>Changes configuration for a TFTP daemon, server,
+ or client process.</fsummary>
+ <type>
+ <v>Pid = pid()</v>
+ <v>Options = [option()]</v>
+ <v>Result = ok | {error, Reason}</v>
+ <v>Reason = term()</v>
+ </type>
+ <desc>
+ <p>Changes configuration for a TFTP daemon, server, or client process.</p>
+ </desc>
+ </func>
+
+ <func>
+ <name>info(daemons) -> [{Pid, Options}]</name>
+ <fsummary>Returns information about all daemons.</fsummary>
+ <type>
+ <v>Pid = [pid()()]</v>
+ <v>Options = [option()]</v>
+ <v>Reason = term()</v>
+ </type>
+ <desc>
+ <p>Returns information about all TFTP daemon processes.</p>
+ </desc>
+ </func>
+
+ <func>
+ <name>info(servers) -> [{Pid, Options}]</name>
+ <fsummary>Returns information about all servers.</fsummary>
+ <type>
+ <v>Pid = [pid()()]</v>
+ <v>Options = [option()]</v>
+ <v>Reason = term()</v>
+ </type>
+ <desc>
+ <p>Returns information about all TFTP server processes. </p>
+ </desc>
+ </func>
+
+ <func>
+ <name>info(Pid) -> {ok, Options} | {error, Reason}</name>
+ <fsummary>Returns information about a daemon, server, or client process.</fsummary>
+ <type>
+ <v>Options = [option()]</v>
+ <v>Reason = term()</v>
+ </type>
+ <desc>
+ <p>Returns information about a TFTP daemon, server, or client process.</p>
+ </desc>
+ </func>
+
+ <func>
+ <name>read_file(RemoteFilename, LocalFilename, Options) -> {ok, LastCallbackState} | {error, Reason}</name>
+ <fsummary>Reads a (virtual) file from a TFTP server.</fsummary>
+ <type>
+ <v>RemoteFilename = string()</v>
+ <v>LocalFilename = binary | string()</v>
+ <v>Options = [option()]</v>
+ <v>LastCallbackState = term()</v>
+ <v>Reason = term()</v>
+ </type>
+ <desc>
+ <p>Reads a (virtual) file <c>RemoteFilename</c> from a TFTP
+ server.</p>
+ <p>If <c>LocalFilename</c> is the atom <c>binary</c>,
+ <c>tftp_binary</c> is used as callback module. It concatenates
+ all transferred blocks and returns them as one single binary
+ in <c>LastCallbackState</c>.</p>
+ <p>If <c>LocalFilename</c> is a string and there are no
+ registered callback modules, <c>tftp_file</c> is used as
+ callback module. It writes each transferred block to the file
+ named <c>LocalFilename</c> and returns the number of
+ transferred bytes in <c>LastCallbackState</c>.</p>
+ <p>If <c>LocalFilename</c> is a string and there are registered
+ callback modules, <c>LocalFilename</c> is tested against
+ the regexps of these and the callback module corresponding to
+ the first match is used, or an error tuple is returned if no
+ matching regexp is found.</p>
+ </desc>
+ </func>
+
+ <func>
+ <name>start(Options) -> {ok, Pid} | {error, Reason}</name>
+ <fsummary>Starts a daemon process.</fsummary>
+ <type>
+ <v>Options = [option()]</v>
+ <v>Pid = pid()</v>
+ <v>Reason = term()</v>
+ </type>
+ <desc>
+ <p>Starts a daemon process listening for UDP packets on a
+ port. When it receives a request for read or write, it spawns
+ a temporary server process handling the actual transfer
+ of the (virtual) file.</p>
+ </desc>
+ </func>
+
+ <func>
+ <name>write_file(RemoteFilename, LocalFilename, Options) -> {ok, LastCallbackState} | {error, Reason}</name>
+ <fsummary>Writes a (virtual) file to a TFTP server.</fsummary>
+ <type>
+ <v>RemoteFilename = string()</v>
+ <v>LocalFilename = binary() | string()</v>
+ <v>Options = [option()]</v>
+ <v>LastCallbackState = term()</v>
+ <v>Reason = term()</v>
+ </type>
+ <desc>
+ <p>Writes a (virtual) file <c>RemoteFilename</c> to a TFTP
+ server.</p>
+ <p>If <c>LocalFilename</c> is a binary, <c>tftp_binary</c> is
+ used as callback module. The binary is transferred block by
+ block and the number of transferred bytes is returned in
+ <c>LastCallbackState</c>.</p>
+ <p>If <c>LocalFilename</c> is a string and there are no
+ registered callback modules, <c>tftp_file</c> is used as
+ callback module. It reads the file named <c>LocalFilename</c>
+ block by block and returns the number of transferred bytes
+ in <c>LastCallbackState</c>.</p>
+ <p>If <c>LocalFilename</c> is a string and there are registered
+ callback modules, <c>LocalFilename</c> is tested against
+ the regexps of these and the callback module corresponding to
+ the first match is used, or an error tuple is returned if no
+ matching regexp is found.</p>
+ </desc>
+ </func>
+ </funcs>
+
+ <section>
+ <marker id="tftp_callback"></marker>
+ <title>CALLBACK FUNCTIONS</title>
+ <p>A <c>tftp</c> callback module is to be implemented as a
+ <c>tftp</c> behavior and export the functions listed
+ in the following.</p>
+ <p>On the server side, the callback interaction starts with a call to
+ <c>open/5</c> with the registered initial callback state.
+ <c>open/5</c> is expected to open the (virtual) file. Then either
+ function <c>read/1</c> or <c>write/2</c> is invoked
+ repeatedly, once per transferred block. At each function call,
+ the state returned from the previous call is obtained. When
+ the last block is encountered, function <c>read/1</c> or
+ <c>write/2</c> is expected to close the (virtual) file
+ and return its last state. Function <c>abort/3</c> is only
+ used in error situations. Function <c>prepare/5</c> is not used on
+ the server side.</p>
+ <p>On the client side, the callback interaction is the same, but it
+ starts and ends a bit differently. It starts with a call to
+ <c>prepare/5</c> with the same arguments as <c>open/5</c> takes.
+ <c>prepare/5</c> is expected to validate the TFTP options
+ suggested by the user and to return the subset of them that it
+ accepts. Then the options are sent to the server, which performs
+ the same TFTP option negotiation procedure. The options that are
+ accepted by the server are forwarded to function <c>open/5</c>
+ on the client side. On the client side, function <c>open/5</c>
+ must accept all option as-is or reject the transfer. Then
+ the callback interaction follows the same pattern as described
+ for the server side. When the last block is encountered in
+ <c>read/1</c> or <c>write/2</c>, the returned state is forwarded to
+ the user and returned from <c>read_file</c>/3 or
+ <c>write_file/3</c>.</p>
+
+ <p> If a callback (performing the file access
+ in the TFTP server) takes too long time (more than
+ the double TFTP time-out), the server aborts the
+ connection and sends an error reply to the client.
+ This implies that the server releases resources
+ attached to the connection faster than before. The
+ server simply assumes that the client has given
+ up.</p>
+
+ <p>If the TFTP server receives yet another request from
+ the same client (same host and port) while it
+ already has an active connection to the client, it
+ ignores the new request if the request is
+ equal to the first one (same filename and options).
+ This implies that the (new) client will be served
+ by the already ongoing connection on the server
+ side. By not setting up yet another connection, in
+ parallel with the ongoing one, the server
+ consumes less resources.</p>
+
+ <marker id="prepare"></marker>
+ </section>
+
+ <funcs>
+ <func>
+ <name>Module:abort(Code, Text, State) -> ok</name>
+ <fsummary>Aborts the file transfer.</fsummary>
+ <type>
+ <v>Code = undef | enoent | eacces | enospc</v>
+ <v>&nbsp;&nbsp;| badop | eexist | baduser | badopt</v>
+ <v>&nbsp;&nbsp;| int()</v>
+ <v>Text = string()</v>
+ <v>State = term()</v>
+ </type>
+ <desc>
+ <p>Invoked when the file transfer is aborted.</p>
+ <p>The callback function is expected to clean
+ up its used resources after the aborted file
+ transfer, such as closing open file
+ descriptors and so on. The function is not
+ invoked if any of the other callback
+ functions returns an error, as it is
+ expected that they already have cleaned up
+ the necessary resources. However, it is
+ invoked if the functions fail (crash).</p>
+ </desc>
+ </func>
+
+ <func>
+ <name>Module:open(Peer, Access, Filename, Mode, SuggestedOptions, State) -> {ok, AcceptedOptions, NewState} | {error, {Code, Text}}</name>
+ <fsummary>Opens a file for read or write access.</fsummary>
+ <type>
+ <v>Peer = {PeerType, PeerHost, PeerPort}</v>
+ <v>PeerType = inet | inet6</v>
+ <v>PeerHost = ip_address()</v>
+ <v>PeerPort = integer()</v>
+ <v>Access = read | write</v>
+ <v>Filename = string()</v>
+ <v>Mode = string()</v>
+ <v>SuggestedOptions = AcceptedOptions = [{Key, Value}]</v>
+ <v>&nbsp;Key = Value = string()</v>
+ <v>State = InitialState | term()</v>
+ <v>&nbsp;InitialState = [] | [{root_dir, string()}]</v>
+ <v>NewState = term()</v>
+ <v>Code = undef | enoent | eacces | enospc</v>
+ <v>&nbsp;&nbsp;| badop | eexist | baduser | badopt</v>
+ <v>&nbsp;&nbsp;| int()</v>
+ <v>Text = string()</v>
+ </type>
+ <desc>
+ <p>Opens a file for read or write access.</p>
+ <p>On the client side, where the <c>open/5</c> call has been
+ preceded by a call to <c>prepare/5</c>, all options must be
+ accepted or rejected.</p>
+ <p>On the server side, where there is no preceding
+ <c>prepare/5</c> call, no new options can be added, but
+ those present in <c>SuggestedOptions</c> can be
+ omitted or replaced with new values in <c>AcceptedOptions</c>.</p>
+
+ <marker id="read"></marker>
+ </desc>
+ </func>
+
+ <func>
+ <name>Module:prepare(Peer, Access, Filename, Mode, SuggestedOptions, InitialState) -> {ok, AcceptedOptions, NewState} | {error, {Code, Text}}</name>
+ <fsummary>Prepares to open a file on the client side.</fsummary>
+ <type>
+ <v>Peer = {PeerType, PeerHost, PeerPort}</v>
+ <v>PeerType = inet | inet6</v>
+ <v>PeerHost = ip_address()</v>
+ <v>PeerPort = integer()</v>
+ <v>Access = read | write</v>
+ <v>Filename = string()</v>
+ <v>Mode = string()</v>
+ <v>SuggestedOptions = AcceptedOptions = [{Key, Value}]</v>
+ <v>&nbsp;Key = Value = string()</v>
+ <v>InitialState = [] | [{root_dir, string()}]</v>
+ <v>NewState = term()</v>
+ <v>Code = undef | enoent | eacces | enospc</v>
+ <v>&nbsp;&nbsp;| badop | eexist | baduser | badopt</v>
+ <v>&nbsp;&nbsp;| int()</v>
+ <v>Text = string()</v>
+ </type>
+ <desc>
+ <p>Prepares to open a file on the client side.</p>
+ <p>No new options can be added, but those present in
+ <c>SuggestedOptions</c> can be omitted or replaced with new
+ values in <c>AcceptedOptions</c>.</p>
+ <p>This is followed by a call to <c>open/4</c> before any
+ read/write access is performed. <c>AcceptedOptions</c> is
+ sent to the server, which replies with the options that it
+ accepts. These are then forwarded to <c>open/4</c> as
+ <c>SuggestedOptions</c>.</p>
+
+ <marker id="open"></marker>
+ </desc>
+ </func>
+
+ <func>
+ <name>Module:read(State) -> {more, Bin, NewState} | {last, Bin, FileSize} | {error, {Code, Text}}</name>
+ <fsummary>Reads a chunk from the file.</fsummary>
+ <type>
+ <v>State = NewState = term()</v>
+ <v>Bin = binary()</v>
+ <v>FileSize = int()</v>
+ <v>Code = undef | enoent | eacces | enospc</v>
+ <v>&nbsp;&nbsp;| badop | eexist | baduser | badopt</v>
+ <v>&nbsp;&nbsp;| int()</v>
+ <v>Text = string()</v>
+ </type>
+ <desc>
+ <p>Reads a chunk from the file.</p>
+ <p>The callback function is expected to close
+ the file when the last file chunk is
+ encountered. When an error is encountered,
+ the callback function is expected to clean
+ up after the aborted file transfer, such as
+ closing open file descriptors, and so on. In both
+ cases there will be no more calls to any of
+ the callback functions.</p>
+
+ <marker id="write"></marker>
+ </desc>
+ </func>
+
+ <func>
+ <name>Module:write(Bin, State) -> {more, NewState} | {last, FileSize} | {error, {Code, Text}}</name>
+ <fsummary>Writes a chunk to the file.</fsummary>
+ <type>
+ <v>Bin = binary()</v>
+ <v>State = NewState = term()</v>
+ <v>FileSize = int()</v>
+ <v>Code = undef | enoent | eacces | enospc</v>
+ <v>&nbsp;&nbsp;| badop | eexist | baduser | badopt</v>
+ <v>&nbsp;&nbsp;| int()</v>
+ <v>Text = string()</v>
+ </type>
+ <desc>
+ <p>Writes a chunk to the file.</p>
+ <p>The callback function is expected to close
+ the file when the last file chunk is
+ encountered. When an error is encountered,
+ the callback function is expected to clean
+ up after the aborted file transfer, such as
+ closing open file descriptors, and so on. In both
+ cases there will be no more calls to any of
+ the callback functions.</p>
+
+ <marker id="abort"></marker>
+ </desc>
+ </func>
+ </funcs>
+
+ <section>
+ <marker id="tftp_logger"></marker>
+ <title>LOGGER FUNCTIONS</title>
+
+ <p>A <c>tftp_logger</c> callback module is to be implemented as a
+ <c>tftp_logger</c> behavior and export the following functions:</p>
+
+ <marker id="error_msg"></marker>
+ </section>
+
+ <funcs>
+ <func>
+ <name>Logger:error_msg(Format, Data) -> ok | exit(Reason)</name>
+ <fsummary>Logs an error message.</fsummary>
+ <type>
+ <v>Format = string()</v>
+ <v>Data = [term()]</v>
+ <v>Reason = term()</v>
+ </type>
+ <desc>
+ <p>Logs an error message.
+ See <c>error_logger:error_msg/2</c> for details.</p>
+
+ <marker id="warning_msg"></marker>
+ </desc>
+ </func>
+
+ <func>
+ <name>Logger:info_msg(Format, Data) -> ok | exit(Reason)</name>
+ <fsummary>Logs an info message.</fsummary>
+ <type>
+ <v>Format = string()</v>
+ <v>Data = [term()]</v>
+ <v>Reason = term()</v>
+ </type>
+ <desc>
+ <p>Logs an info message.
+ See <c>error_logger:info_msg/2</c> for details.</p>
+ </desc>
+ </func>
+
+ <func>
+ <name>Logger:warning_msg(Format, Data) -> ok | exit(Reason)</name>
+ <fsummary>Logs a warning message.</fsummary>
+ <type>
+ <v>Format = string()</v>
+ <v>Data = [term()]</v>
+ <v>Reason = term()</v>
+ </type>
+ <desc>
+ <p>Logs a warning message.
+ See <c>error_logger:warning_msg/2</c> for details.</p>
+
+ <marker id="info_msg"></marker>
+ </desc>
+ </func>
+ </funcs>
+</erlref>
+
+