'\" '\" Generated from file 'receiver\&.man' by tcllib/doctools with format 'nroff' '\" Copyright (c) 2006 Andreas Kupries '\" .TH "transfer::receiver" 3tcl 0\&.2 tcllib "Data transfer facilities" .\" The -*- nroff -*- definitions below are for supplemental macros used .\" in Tcl/Tk manual entries. .\" .\" .AP type name in/out ?indent? .\" Start paragraph describing an argument to a library procedure. .\" type is type of argument (int, etc.), in/out is either "in", "out", .\" or "in/out" to describe whether procedure reads or modifies arg, .\" and indent is equivalent to second arg of .IP (shouldn't ever be .\" needed; use .AS below instead) .\" .\" .AS ?type? ?name? .\" Give maximum sizes of arguments for setting tab stops. Type and .\" name are examples of largest possible arguments that will be passed .\" to .AP later. If args are omitted, default tab stops are used. .\" .\" .BS .\" Start box enclosure. From here until next .BE, everything will be .\" enclosed in one large box. .\" .\" .BE .\" End of box enclosure. .\" .\" .CS .\" Begin code excerpt. .\" .\" .CE .\" End code excerpt. .\" .\" .VS ?version? ?br? .\" Begin vertical sidebar, for use in marking newly-changed parts .\" of man pages. The first argument is ignored and used for recording .\" the version when the .VS was added, so that the sidebars can be .\" found and removed when they reach a certain age. If another argument .\" is present, then a line break is forced before starting the sidebar. .\" .\" .VE .\" End of vertical sidebar. .\" .\" .DS .\" Begin an indented unfilled display. .\" .\" .DE .\" End of indented unfilled display. .\" .\" .SO ?manpage? .\" Start of list of standard options for a Tk widget. The manpage .\" argument defines where to look up the standard options; if .\" omitted, defaults to "options". The options follow on successive .\" lines, in three columns separated by tabs. .\" .\" .SE .\" End of list of standard options for a Tk widget. .\" .\" .OP cmdName dbName dbClass .\" Start of description of a specific option. cmdName gives the .\" option's name as specified in the class command, dbName gives .\" the option's name in the option database, and dbClass gives .\" the option's class in the option database. .\" .\" .UL arg1 arg2 .\" Print arg1 underlined, then print arg2 normally. .\" .\" .QW arg1 ?arg2? .\" Print arg1 in quotes, then arg2 normally (for trailing punctuation). .\" .\" .PQ arg1 ?arg2? .\" Print an open parenthesis, arg1 in quotes, then arg2 normally .\" (for trailing punctuation) and then a closing parenthesis. .\" .\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages. .if t .wh -1.3i ^B .nr ^l \n(.l .ad b .\" # Start an argument description .de AP .ie !"\\$4"" .TP \\$4 .el \{\ . ie !"\\$2"" .TP \\n()Cu . el .TP 15 .\} .ta \\n()Au \\n()Bu .ie !"\\$3"" \{\ \&\\$1 \\fI\\$2\\fP (\\$3) .\".b .\} .el \{\ .br .ie !"\\$2"" \{\ \&\\$1 \\fI\\$2\\fP .\} .el \{\ \&\\fI\\$1\\fP .\} .\} .. .\" # define tabbing values for .AP .de AS .nr )A 10n .if !"\\$1"" .nr )A \\w'\\$1'u+3n .nr )B \\n()Au+15n .\" .if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n .nr )C \\n()Bu+\\w'(in/out)'u+2n .. .AS Tcl_Interp Tcl_CreateInterp in/out .\" # BS - start boxed text .\" # ^y = starting y location .\" # ^b = 1 .de BS .br .mk ^y .nr ^b 1u .if n .nf .if n .ti 0 .if n \l'\\n(.lu\(ul' .if n .fi .. .\" # BE - end boxed text (draw box now) .de BE .nf .ti 0 .mk ^t .ie n \l'\\n(^lu\(ul' .el \{\ .\" Draw four-sided box normally, but don't draw top of .\" box if the box started on an earlier page. .ie !\\n(^b-1 \{\ \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul' .\} .el \}\ \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul' .\} .\} .fi .br .nr ^b 0 .. .\" # VS - start vertical sidebar .\" # ^Y = starting y location .\" # ^v = 1 (for troff; for nroff this doesn't matter) .de VS .if !"\\$2"" .br .mk ^Y .ie n 'mc \s12\(br\s0 .el .nr ^v 1u .. .\" # VE - end of vertical sidebar .de VE .ie n 'mc .el \{\ .ev 2 .nf .ti 0 .mk ^t \h'|\\n(^lu+3n'\L'|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-|\\n(^lu+3n' .sp -1 .fi .ev .\} .nr ^v 0 .. .\" # Special macro to handle page bottom: finish off current .\" # box/sidebar if in box/sidebar mode, then invoked standard .\" # page bottom macro. .de ^B .ev 2 'ti 0 'nf .mk ^t .if \\n(^b \{\ .\" Draw three-sided box if this is the box's first page, .\" draw two sides but no top otherwise. .ie !\\n(^b-1 \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c .el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c .\} .if \\n(^v \{\ .nr ^x \\n(^tu+1v-\\n(^Yu \kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c .\} .bp 'fi .ev .if \\n(^b \{\ .mk ^y .nr ^b 2 .\} .if \\n(^v \{\ .mk ^Y .\} .. .\" # DS - begin display .de DS .RS .nf .sp .. .\" # DE - end display .de DE .fi .RE .sp .. .\" # SO - start of list of standard options .de SO 'ie '\\$1'' .ds So \\fBoptions\\fR 'el .ds So \\fB\\$1\\fR .SH "STANDARD OPTIONS" .LP .nf .ta 5.5c 11c .ft B .. .\" # SE - end of list of standard options .de SE .fi .ft R .LP See the \\*(So manual entry for details on the standard options. .. .\" # OP - start of full description for a single option .de OP .LP .nf .ta 4c Command-Line Name: \\fB\\$1\\fR Database Name: \\fB\\$2\\fR Database Class: \\fB\\$3\\fR .fi .IP .. .\" # CS - begin code excerpt .de CS .RS .nf .ta .25i .5i .75i 1i .. .\" # CE - end code excerpt .de CE .fi .RE .. .\" # UL - underline word .de UL \\$1\l'|0\(ul'\\$2 .. .\" # QW - apply quotation marks to word .de QW .ie '\\*(lq'"' ``\\$1''\\$2 .\"" fix emacs highlighting .el \\*(lq\\$1\\*(rq\\$2 .. .\" # PQ - apply parens and quotation marks to word .de PQ .ie '\\*(lq'"' (``\\$1''\\$2)\\$3 .\"" fix emacs highlighting .el (\\*(lq\\$1\\*(rq\\$2)\\$3 .. .\" # QR - quoted range .de QR .ie '\\*(lq'"' ``\\$1''\\-``\\$2''\\$3 .\"" fix emacs highlighting .el \\*(lq\\$1\\*(rq\\-\\*(lq\\$2\\*(rq\\$3 .. .\" # MT - "empty" string .de MT .QW "" .. .BS .SH NAME transfer::receiver \- Data source .SH SYNOPSIS package require \fBTcl 8\&.4\fR .sp package require \fBsnit ?1\&.0?\fR .sp package require \fBtransfer::data::destination ?0\&.2?\fR .sp package require \fBtransfer::connect ?0\&.2?\fR .sp package require \fBtransfer::receiver ?0\&.2?\fR .sp \fBtransfer::receiver\fR \fIobject\fR ?\fIoptions\fR\&.\&.\&.? .sp \fBtransfer::receiver\fR \fBstream channel\fR \fIchan\fR \fIhost\fR \fIport\fR ?\fIarg\fR\&.\&.\&.? .sp \fBtransfer::receiver\fR \fBstream file\fR \fIpath\fR \fIhost\fR \fIport\fR ?\fIarg\fR\&.\&.\&.? .sp \fIobjectName\fR \fBmethod\fR ?\fIarg arg \&.\&.\&.\fR? .sp \fIobjectName\fR \fBdestroy\fR .sp \fIobjectName\fR \fBstart\fR .sp \fIobjectName\fR \fBbusy\fR .sp .BE .SH DESCRIPTION .PP This package pulls data destinations and connection setup together into a combined object for the reception of information coming in over a socket\&. These objects understand all the options from objects created by the packages \fBtransfer::data::destination\fR and \fBtransfer::connect\fR\&. .SH API .SS "PACKAGE COMMANDS" .TP \fBtransfer::receiver\fR \fIobject\fR ?\fIoptions\fR\&.\&.\&.? This command creates a new receiver object with an associated Tcl command whose name is \fIobjectName\fR\&. This \fIobject\fR command is explained in full detail in the sections \fBObject command\fR and \fBObject methods\fR\&. The set of supported \fIoptions\fR is explained in section \fBOptions\fR\&. .sp The object command will be created under the current namespace if the \fIobjectName\fR is not fully qualified, and in the specified namespace otherwise\&. The fully qualified name of the object command is returned as the result of the command\&. .TP \fBtransfer::receiver\fR \fBstream channel\fR \fIchan\fR \fIhost\fR \fIport\fR ?\fIarg\fR\&.\&.\&.? This method creates a fire-and-forget transfer for the data coming from the source at host/port (details below) and writing to the channel \fIchan\fR, starting at the current seek location\&. The channel is configured to use binary translation and encoding for the transfer\&. The channel is \fInot\fR closed when the transfer has completed\&. This is left to the completion callback\&. .sp If both \fIhost\fR and \fIport\fR are provided an \fBactive\fR connection to the data source is made\&. If only a \fIport\fR is specified (with \fIhost\fR the empty string) then a \fBpassive\fR connection is made instead, i\&.e\&. the receiver then waits for a conneciton by the transmitter\&. .sp Any arguments after the port are treated as options and are used to configure the internal receiver object\&. See the section \fBOptions\fR for a list of the supported options and their meaning\&. \fINote\fR however that the signature of the command prefix specified for the \fB-command\fR callback differs from the signature for the same option of the receiver object\&. This callback is only given the number of bytes and transfered, and possibly an error message\&. No reference to the internally used receiver object is made\&. .sp The result returned by the command is the empty string if it was set to make an \fIactive\fR connection, and the port the internal receiver object is listening on otherwise, i\&.e when it is configured to connect \fIpassive\fRly\&. See also the package \fBtransfer::connect\fR and the description of the method \fBconnect\fR for where this behaviour comes from\&. .TP \fBtransfer::receiver\fR \fBstream file\fR \fIpath\fR \fIhost\fR \fIport\fR ?\fIarg\fR\&.\&.\&.? This method is like \fBstream channel\fR, except that the received data is written to the file \fIpath\fR, replacing any prior content\&. .PP .SS "OBJECT COMMAND" All objects created by the \fB::transfer::receiver\fR command have the following general form: .TP \fIobjectName\fR \fBmethod\fR ?\fIarg arg \&.\&.\&.\fR? The method \fBmethod\fR and its \fIarg\fR'uments determine the exact behavior of the command\&. See section \fBObject methods\fR for the detailed specifications\&. .PP .SS "OBJECT METHODS" .TP \fIobjectName\fR \fBdestroy\fR This method destroys the object\&. Doing so while a reception is on progress will cause errors later on, when the reception completes and tries to access the now missing data structures of the destroyed object\&. .TP \fIobjectName\fR \fBstart\fR This method initiates the data reception, setting up the connection first and then copying the received information into the destination\&. The method will throw an error if a reception is already/still in progress\&. I\&.e\&. it is not possible to run two receptions in parallel, only in sequence\&. Errors will also be thrown if the configuration of the data destination is invalid, or if no completion callback was specified\&. .sp The result returned by the method is the empty string for an object configured to make an \fIactive\fR connection, and the port the object is listening on otherwise, i\&.e when it is configured to connect \fIpassive\fRly\&. See also the package \fBtransfer::connect\fR and the description of the method \fBconnect\fR for where this behaviour comes from\&. .TP \fIobjectName\fR \fBbusy\fR This method returns a boolean value telling us whether a reception is in progress (\fBTrue\fR), or not (\fBFalse\fR)\&. .PP .SS OPTIONS All receiver objects support the union of the options supported by their connect and data destination components, plus one of their own\&. See also the documentation for the packages \fBtransfer::data::destination\fR and \fBtransfer::connect\fR\&. .TP \fB-command\fR \fIcmdprefix\fR This option specifies the command to invoke when the reception of the information has been completed\&. The arguments given to this command are the same as given to the completion callback of the command \fBtransfer::copy::do\fR provided by the package \fBtransfer::copy\fR\&. .TP \fB-mode\fR \fImode\fR This option specifies the mode the object is in\&. It is optional and defaults to \fBactive\fR mode\&. The two possible modes are: .RS .TP \fBactive\fR In this mode the two options \fB-host\fR and \fB-port\fR are relevant and specify the host and TCP port the object has to connect to\&. The host is given by either name or IP address\&. .TP \fBpassive\fR In this mode the option \fB-host\fR has no relevance and is ignored should it be configured\&. The only option the object needs is \fB-port\fR, and it specifies the TCP port on which the listening socket is opened to await the connection from the partner\&. .RE .TP \fB-host\fR \fIhostname-or-ipaddr\fR This option specifies the host to connect to in \fIactive\fR mode, either by name or ip-address\&. An object configured for \fIpassive\fR mode ignores this option\&. .TP \fB-port\fR \fIint\fR For \fIactive\fR mode this option specifies the port the object is expected to connect to\&. For \fIpassive\fR mode however it is the port where the object creates the listening socket waiting for a connection\&. It defaults to \fB0\fR, which allows the OS to choose the actual port to listen on\&. .TP \fB-socketcmd\fR \fIcommand\fR This option allows the user to specify which command to use to open a socket\&. The default is to use the builtin \fB::socket\fR\&. Any compatible with that command is allowed\&. .sp The envisioned main use is the specfication of \fBtls::socket\fR\&. I\&.e\&. this option allows the creation of secure transfer channels, without making this package explicitly dependent on the \fBtls\fR package\&. .sp See also section \fBSecure connections\fR\&. .TP \fB-encoding\fR encodingname .TP \fB-eofchar\fR eofspec .TP \fB-translation\fR transspec These options are the same as are recognized by the builtin command \fBfconfigure\fR\&. They provide the configuration to be set for the channel between the two partners after it has been established, but before the callback is invoked (See method \fBconnect\fR)\&. .TP \fB-channel\fR \fIhandle\fR This option specifies that the destination of the data is a channel, and its associated argument is the handle of the channel to write the received data to\&. .TP \fB-file\fR \fIpath\fR This option specifies that the destination of the data is a file, and its associated argument is the path of the file to write the received data to\&. .TP \fB-variable\fR \fIvarname\fR This option specifies that the destination of the data is a variable, and its associated argument contains the name of the variable to write the received data to\&. The variable is assumed to be global or namespaced, anchored at the global namespace\&. .TP \fB-progress\fR \fIcommand\fR This option, if specified, defines a command to be invoked for each chunk of bytes received, allowing the user to monitor the progress of the reception of the data\&. The callback is always invoked with one additional argument, the number of bytes received so far\&. .PP .SH "SECURE CONNECTIONS" One way to secure connections made by objects of this package is to require the package \fBtls\fR and then configure the option \fB-socketcmd\fR to force the use of command \fBtls::socket\fR to open the socket\&. .CS # Load and initialize tls package require tls tls::init -cafile /path/to/ca/cert -keyfile \&.\&.\&. # Create a connector with secure socket setup, transfer::receiver R -socketcmd tls::socket \&.\&.\&. \&.\&.\&. .CE .SH "TLS SECURITY CONSIDERATIONS" This package uses the \fBTLS\fR package to handle the security for \fBhttps\fR urls and other socket connections\&. .PP Policy decisions like the set of protocols to support and what ciphers to use are not the responsibility of \fBTLS\fR, nor of this package itself however\&. Such decisions are the responsibility of whichever application is using the package, and are likely influenced by the set of servers the application will talk to as well\&. .PP For example, in light of the recent \fIPOODLE attack\fR [http://googleonlinesecurity\&.blogspot\&.co\&.uk/2014/10/this-poodle-bites-exploiting-ssl-30\&.html] discovered by Google many servers will disable support for the SSLv3 protocol\&. To handle this change the applications using \fBTLS\fR must be patched, and not this package, nor \fBTLS\fR itself\&. Such a patch may be as simple as generally activating \fBtls1\fR support, as shown in the example below\&. .CS package require tls tls::init -tls1 1 ;# forcibly activate support for the TLS1 protocol \&.\&.\&. your own application code \&.\&.\&. .CE .SH "BUGS, IDEAS, FEEDBACK" This document, and the package it describes, will undoubtedly contain bugs and other problems\&. Please report such in the category \fItransfer\fR of the \fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&. Please also report any ideas for enhancements you may have for either package and/or documentation\&. .PP When proposing code changes, please provide \fIunified diffs\fR, i\&.e the output of \fBdiff -u\fR\&. .PP Note further that \fIattachments\fR are strongly preferred over inlined patches\&. Attachments can be made by going to the \fBEdit\fR form of the ticket immediately after its creation, and then using the left-most button in the secondary navigation bar\&. .SH KEYWORDS channel, copy, data destination, receiver, secure, ssl, tls, transfer .SH CATEGORY Transfer module .SH COPYRIGHT .nf Copyright (c) 2006 Andreas Kupries .fi