/usr/lib/exmh/receipt.tcl is in exmh 1:2.8.0-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Handling of message disposition notifications
#
# removes any disposition-notification-to header and puts a brand new one
proc MDNAskReceipt { draft t } {
global miscRE mime env faces
if {[info exists mime(mdnTo)] && $mime(mdnTo) != {}} {
set mdnTo $mime(mdnTo)
} else {
set host [exec hostname --fqdn]
set domain $faces(defaultDomain)
if {$domain == ""} {
catch {set domain [exec domainname]'}
}
if {$domain == ""} {
catch {set domain [exec grep domain /etc/resolv.conf | cut -f2 -d\ ]'}
}
if {$domain == ""} {
set domain "PLEASE CONFIGURE DISPOSITION NOTIFICATION UNDER PREFS/MIME"
}
set mdnTo $env(USER)@$host.$domain
}
SeditSave $draft $t
set linenb 1
set line [$t get $linenb.0 $linenb.end]
while {![regexp $miscRE(headerend) $line]} {
if [regexp -nocase {^disposition-notification-to:} $line] {
set line " dummy"
while {[regexp "^\[ \t]" $line]} {
$t delete $linenb.0 [expr {$linenb + 1}].0
set line [$t get $linenb.0 $linenb.end]
}
} else {
set linenb [expr {$linenb + 1}]
}
set line [$t get $linenb.0 $linenb.end]
}
$t insert 1.0 "Disposition-Notification-To: $mdnTo\n"
}
proc MDNGenerate { file address choice mode } {
global exwin mimeHdr
if {$choice != "ignored"} {
set mdnfile [MDNBuildDraft $file $address $choice $mode]
if [catch {exec send -nopush $mdnfile} result] {
Exmh_Debug "send result: $result"
Exmh_Status "Could not send message disposition notification" error
return
}
}
MDNAddHeaderToDraft $file "X-ExmhMDN: $choice"
MsgShowInText $exwin(mtext) $mimeHdr(0,rawfile)
}
proc MDNAddHeaderToDraft { draft header } {
if [catch {open $draft} in] {
error "Cannot read draft to add header"
}
if [catch {open $draft.new w} out] {
close $in
error "Cannot add header"
}
set state header
for {set len [gets $in line]} {! [eof $in]} {set len [gets $in line]} {
if {$state == "header"} {
if {$len == 0 || [regexp ^-- $line]} {
set state body
puts $out $header
}
}
puts $out $line
}
close $out
close $in
Mh_Rename $draft.new $draft
}
proc MDNAsk {tkw address explain} {
global mimeHdr exmh
$tkw insert insert " The sender wants you to acknowledge that you have\
seen this mail."
if {[string compare $explain {}] != 0} {
$tkw insert insert "\n\n NOTE! For the reason(s) listed below, it may\
be unsafe to send the disposition notification. Please check the\
message carefully. Unless you are sure that it is safe to send\
the notification, press \"Ignore silently\""
$tkw insert insert $explain
}
$tkw insert insert "\n\n Do you want to send a disposition notification\
(receipt) to \n $address?"
$tkw insert insert "\n\n "
TextButton $tkw " Send confirmation " \
[list MDNGenerate $mimeHdr(0,rawfile) \
$mimeHdr(0=1,hdr,disposition-notification-to) \
"displayed" "manual-action/MDN-sent-manually"]
$tkw insert insert " "
TextButton $tkw " Send denial " \
[list MDNGenerate $mimeHdr(0,rawfile) \
$mimeHdr(0=1,hdr,disposition-notification-to) \
"denied" "manual-action/MDN-sent-manually"]
$tkw insert insert " "
TextButton $tkw " Ignore silently " \
[list MDNGenerate $mimeHdr(0,rawfile) \
$mimeHdr(0=1,hdr,disposition-notification-to) \
"ignored" {}]
$tkw insert insert "\n"
MimeInsertSeparator $tkw 0 6
}
proc MDNCheck { tkw } {
global mimeHdr mime
if {![info exists mimeHdr(0=1,hdr,x-exmhmdn)] && \
[info exists mimeHdr(0=1,hdr,disposition-notification-to)]} {
if [info exists mime(mdnDone)] {
unset mime(mdnDone)
} else {
set dnt $mimeHdr(0=1,hdr,disposition-notification-to)
switch $mime(mdnSend) {
"never" {
set mdnAction1 "ignored"
set mdnAction2 "ignored"
}
"deny" {
set mdnAction1 "denied"
set mdnAction2 "ignored"
}
"ask user" {
set mdnAction1 "ask"
set mdnAction2 "ask"
}
"auto/ask" {
set mdnAction1 "displayed"
set mdnAction2 "ask"
}
"auto/ignore" {
set mdnAction1 "displayed"
set mdnAction2 "ignored"
}
default {
set mdnAction1 "ask"
set mdnAction2 "ask"
}
}
set mdnExplain {}
set line [string trim $dnt]
if [regsub {\(.*\)} $line {} newline] {
set line $newline
}
if {[string first "|" $line] != -1} {
set mdnAction1 "ignore"
set mdnExplain "$mdnExplain
* The address(es) for the disposition notification contains a pipe symbol (|)
*** THIS MAY BE A SERIOUS SECURITY HOLE."
}
if {[string first "," $line] != -1} {
set mdnAction1 $mdnAction2
set mdnExplain "$mdnExplain
* The sender appears to have requested a disposition notification to be
sent to more than one address. If you are not sure that there is a valid
reason to send disposition notifications to each of these addresses,
the request should be ignored and no disposition notifications sent."
}
if [info exists mimeHdr(0=1,hdr,return-path)] {
if {[string compare \
[MsgParseFrom $mimeHdr(0=1,hdr,return-path) {}] \
[MsgParseFrom $line {}]] != 0} {
set mdnAction1 $mdnAction2
set mdnExplain "$mdnExplain
* The disposition notification appears to be directed somewhere else than
to the sender of the message. If you are not sure that there is a valid
reason for this, the request should be ignored and no disposition
notifications sent."
}
} else {
set mdnAction1 $mdnAction2
set mdnExplain "$mdnExplain
* The message does not have a Return-path header field, and therefore it
is not possible to verify that the disposition notification address(es)
is valid."
}
if [info exists mimeHdr(0=1,hdr,disposition-notification-options)]\
{
set mdnAction1 $mdnAction2
set mdnExplain "$mdnExplain
* The message has a Disposition-notification-options header requesting
some special processing which exmh does not know about."
if [regexp -nocase {=[ ]*required[ ]*,} \
$mimeHdr(0=1,hdr,disposition-notification-options)] {
set mdnAction1 "ignored"
set mdnExplain "$mdnExplain
Since one or more of the unknown options are required to be taken into
account for generating a proper disposition notification, no disposition
notification at all should be generated."
}
}
if {[string compare $mdnAction1 "ask"] == 0} {
MDNAsk $tkw $dnt $mdnExplain
} else {
MDNGenerate $mimeHdr(0,rawfile) $dnt $mdnAction1 \
"manual-action/MDN-sent-automatically"
}
}
}
}
proc MDNExplainDisposition { tkw reportVar } {
upvar $reportVar report
set disp $report(disposition)
$tkw insert insert "The disposition code is:
$disp
which means:
"
if [regsub -all {(\(.*\))|([ ]+)} $disp {} newline] {
set disp $newline
}
set disp [string tolower $disp]
if [regexp {^([-a-z]+)/([-a-z]+);([-a-z]+)(/(.*))?$} $disp match \
action_mode sending_mode disp_type match2 disp_modifiers] {
switch $action_mode {
"manual-action" {
$tkw insert insert "
The recipient acted manually on the message:\n"
}
"automatic-action" {
$tkw insert insert "
The recipient's computer system has been set up to act automatically
on incoming messages:\n"
}
default {
$tkw insert insert "
Unable to tell whether the message was acted on manually or automatically.
The code describing the action is: $action_mode,
which is not a valid code.\n"
}
}
switch $disp_type {
"displayed" {
$tkw insert insert "
The mail was displayed by the user agent to someone reading the
recipient's mailbox. (This does not guarantee that it is read
or understood.)"
}
"denied" {
$tkw insert insert "
The recipient does not wish you to be informed of the message's
disposition."
}
"dispatched" {
$tkw insert insert "
The mail has been sent somewhere (e.g. printed, faxed, forwarded)
without being displayed to the user. (The user may or may not see
the message later.)"
}
"processed" {
$tkw insert insert "
The message has been processed in some manner (i.e. by some sort of
rules or server) without being displayed to the user. (The user may
or may not see the message later, or there may not even be a human
user associated with the mailbox.)"
}
"failed" {
$tkw insert insert "
A failure occurred that prevented the proper generation of an MDN."
if [info exists report(failure)] {
$tkw insert insert "
The reason for the failure was:
$report(failure)"
}
}
"deleted" {
$tkw insert insert "
The message has been deleted. (The recipient may or may not have
seen the message. The recipient might \"undelete\" the message at a
later time and read the message.)"
}
default {
$tkw insert insert "
Unknown disposition type $disp_type."
}
}
while {[string length $disp_modifiers] > 0} {
set sep [string first "," $disp_modifiers]
if { $sep < 0 } {
set modifier $disp_modifiers
set disp_modifiers ""
} else {
set modifier \
[string range $disp_modifiers 0 [expr $sep - 1]]
set disp_modifiers \
[string range $disp_modifiers \
[expr $sep + 1] \
[string length $disp_modifiers]]
}
switch $modifier {
"error" {
$tkw insert insert "
An error of some sort occurred that prevented successful processing of
the message. "
if [info exists report(error)] {
$tkw insert insert "Error message:
$report(error)"
} else {
$tkw inser insert "(No error message given)"
}
}
"warning" {
$tkw insert insert "
The message was successfully processed but some sort of exceptional
condition occurred. "
if [info exists report(warning)] {
$tkw insert insert "Warning message:
$report(warning)"
} else {
$tkw inser insert "(No warning message given)"
}
}
"superseded" {
$tkw insert insert "
The message has been automatically rendered obsolete by another
message received. (The recipient may still access and read the
message later.)"
}
"expired" {
$tkw insert insert "
The message has reached its expiration date and has been automatically
removed from the recipient's mailbox."
}
"mailbox-terminated" {
$tkw insert insert "
The recipient's mailbox has been terminated and all messages in it
automatically removed."
}
default {
}
}
}
switch $sending_mode {
"mdn-sent-manually" {
$tkw insert insert "
The recipient manually sent (or confirmed that the user agent could send)
this MDN."
}
"mdn-sent-automatically" {
$tkw insert insert " \
This MDN was generated automatically (with no explicit manual
confirmation by the recipient)."
}
default {
$tkw insert insert "
The way the MDN was sent is described as: $sending_mode
(which is not a valid code)."
}
}
} else {
switch $disp {
"displayed" {
$tkw insert insert "
The mail was displayed by the user agent to someone reading the
recipient's mailbox. This does not guarantee that it is read or
understood."
}
"denied" {
$tkw insert insert "
The recipient does not wish you to be informed of the message's
disposition."
}
"processed" {
$tkw insert insert "
The message has been processed in some manner (e.g. printed, faxed,
forwarded) in response to a user command, without being displayed to the
user. The user may or may not see the message later."
}
"autoprocessed" {
$tkw insert insert "
The message has been processed automatically in some manner (e.g. printed,
faxed, forwarded, gatewayed) in response to some user request made in
advance, without being displayed to the user. The user may or may not
see the message later."
}
"deleted" {
$tkw insert insert "
The message has manually been deleted. The recipient may or may not have
seen the message."
}
"autodeleded" {
$tkw insert insert "
The message has been automatically deleted without being displayed to the
recipient."
}
"obsoleted" {
$tkw insert insert "
The message has been automatically rendered obsolete by another message
received. The recipient may still access and read the message later."
}
"terminated" {
$tkw insert insert "
The recipient's mailbox has been terminated and all messages in it
automatically deleted."
}
"autodenied" {
$tkw insert insert "
The recipient does not wish the sender to be informed of the message's
disposition, and has requested that this MDN be sent automatically."
}
default {
$tkw insert insert "
The format of the disposition code is not recognized,
cannot explain it further."
}
}
}
$tkw insert insert "\n\n"
}
proc MDNBuildDraft { draft address doit choice} {
global env mimeHdr faces exmh
set host [exec hostname --fqdn]
# If /bin/hostname has a '.' in it, assume it's already a FQDN.
if [ regexp {\.} $host ] {
set sourcehost $host
} else { #otherwise, try to find a domain from $faces or resolv.conf
set domain $faces(defaultDomain)
if {$domain == ""} {
catch {set domain [exec grep domain /etc/resolv.conf | cut -f2 -d\ ]'}
}
# Try this last, as YP domainname may not match actual DNS domain
if {$domain == ""} {
catch {set domain [exec domainname]}
}
set sourcehost $host.$domain
}
set rcpt $env(USER)@$sourcehost
if [catch {open $draft} in] {
error "Cannot read original message"
}
set mdn [Mime_TempFile mdn]
if [catch {open $mdn w} out] {
close $in
error "Cannot create mdn"
}
puts $out "Subject: Disposition notification\nTo: $address\nFrom: $rcpt"
# if nmh 1.5 or newer, use Envelope-From: to force mail from: <>
catch {exec scan -version} nmhversion
if [ regexp {nmh-(\d+)\.(\d+)} $nmhversion allofit major minor ] {
if {$major >= 1 && $minor >= 5 } {
puts $out "Envelope-From:"
}
}
set bdry [FvMimeStartMulti $out \
"multipart/report; report-type=disposition-notification" 0]
FvMimeAddPart $out $bdry ""
if {$doit == "displayed"} {
puts $out "
The message below has been displayed to $rcpt.
This is no guarantee that it has been read or understood.
"
} else {
puts $out "
The recipient of the message below did not wish the sender to be informed
of the message's disposition.
"
}
FvMimeAddPart $out $bdry "message/disposition-notification"
puts $out "\nReporting-UA: $sourcehost (Exmh $exmh(version))"
if [info exists mimeHdr(0=1,hdr,original-recipient)] {
puts $out "Original-Recipient: $mimeHdr(0=1,hdr,original-recipient)"
}
puts $out "Final-Recipient: rfc822; $rcpt"
if [info exists mimeHdr(0=1,hdr,message-id)] {
puts $out "Original-Message-ID: $mimeHdr(0=1,hdr,message-id)"
}
puts $out "Disposition: $choice; $doit\n"
FvMimeAddPart $out $bdry "message/rfc822\n"
for {gets $in line} {! [eof $in]} {gets $in line} {
puts $out $line
}
puts $out "--$bdry--"
close $out
close $in
return $mdn
}
proc ExtractAddress { string } {
if {[scan $string "%\[^<]%c%\[^>]" * * address] != 3} {
return $string
}
return $address
}
#I use these procedures, which should become part of seditMime.tcl
#but are still part of something I use on the side -Brent
proc FvMimeStartMulti {out contentType level} {
set boundary [SeditBoundary $out $level]
puts $out "Mime-Version: 1.0"
puts $out "Content-Type: $contentType;\n\tboundary=\"$boundary\""
puts $out "\nMultipart\n"
return $boundary
}
proc FvMimeAddPart {out boundary contentType} {
puts $out "--$boundary"
if {$contentType != ""} {
puts $out "Content-Type: $contentType"
} else {
puts $out ""
}
}
proc FvMimeEndMulti {out boundary} {
puts $out "--$boundary--"
}
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