+#!/usr/bin/env perl
+
+use warnings;
+use strict;
+BEGIN { pop @INC if $INC[-1] eq '.' };
+
+use Fcntl qw(:DEFAULT :flock :seek);
+use File::Find;
+use File::Spec;
+
+use constant MIN_AGE => 60; # seconds
+my $exim = exists $ENV{'EXIM_BINARY'} ? $ENV{'EXIM_BINARY'} : 'exim';
+
+my %known_okay = map {$_=>1} qw( linux darwin freebsd );
+unless (exists $known_okay{$^O}) {
+ warn "for ease, this perl uses flock, not fcntl, assuming they're the same\n";
+ warn "this is not known by this author to be the case on $^O\n";
+ warn "please investigate and either add to allowed-list in script, or rewrite\n";
+ die "bailing out";
+
+ # Another approach to rewriting script: stop all exim receivers and
+ # queue-runners, prevent them from starting, then add your OS to the list and
+ # run, even though the locking type is wrong, relying upon not actually
+ # contending.
+}
+
+my $spool_dir = `$exim -n -bP spool_directory`;
+chomp $spool_dir;
+
+chdir(File::Spec->catfile($spool_dir, 'input'))
+ or die "chdir($spool_dir/input) failed: $!\n";
+
+my $exim_msgid_r = qr/(?:[0-9A-Za-z]{6}-[0-9A-Za-z]{6}-[0-9A-Za-z]{2})/;
+my $spool_dfile_r = qr/^(($exim_msgid_r)-D)\z/o;
+
+sub fh_ends_newline {
+ my ($fh, $dfn, $verbose) = @_;
+ seek($fh, -1, 2) or do { warn "seek(file($dfn)) failed: $!\n"; return -1 };
+ my $count = read $fh, my $ch, 1;
+ if ($count == -1) { warn "failed to read last byte of $dfn\n"; return -1 };
+ if ($count == 0) { warn "file shrunk by one?? problem with $dfn\n"; return -1 };
+ if ($ch eq "\n") { print "okay!\n" if $verbose; return 1 }
+ print "PROBLEM: $dfn missing final newline (got $ch)\n" if $verbose;
+ return 0;
+}
+
+
+sub each_found_file {
+ return unless $_ =~ $spool_dfile_r;
+ my ($msgid, $dfn) = ($2, $1);
+
+ # We should have already upgraded Exim before invoking us, thus any spool
+ # files will be old and we can reduce spending time trying to lock files
+ # still being written to, etc.
+ my @st = lstat($dfn) or return;
+ if ($^T - $st[9] < MIN_AGE) { return };
+ -f "./${msgid}-H" || return;
+
+ print "consider: $dfn\n";
+ open(my $fh, '+<:raw', $dfn) or do {
+ warn "open($dfn) failed: $!\n";
+ return;
+ };
+ # return with a lexical FH in modern Perl should guarantee close, AIUI
+
+ # we do our first check without a lock, so that we can scan past messages
+ # being handled by Exim quickly, and only lock up on those which Exim is
+ # trying and failing to deliver. However, since Exim will be hung on remote
+ # hosts, this is likely. Thus best to kill queue-runners first.
+
+ return if fh_ends_newline($fh, $dfn, 0); # also returns on error
+ print "Problem? $msgid probably missing newline, locking to be sure ...\n";
+ flock($fh, LOCK_EX) or do { warn "flock(file($dfn)) failed: $!\n"; return };
+ return if fh_ends_newline($fh, $dfn, 1); # also returns on error
+
+ fixup_message($msgid, $dfn, $fh);
+
+ close($fh) or warn "close($dfn) failed: $!\n";
+};
+
+sub fixup_message {
+ my ($msgid, $dfn, $fh) = @_;
+ # we can't freeze the message, our lock stops that, which is good!
+
+ seek($fh, 0, 2) or do { warn "seek(file($dfn)) failed: $!\n"; return -1 };
+
+ my $r = inc_message_header_linecount($msgid);
+ if ($r < 0) {
+ warn "failed to fix message headers in ${msgid}-H so not editing message\n";
+ return;
+ }
+
+ print {$fh} "\n";
+
+ print "${msgid}: added newline\n";
+};
+
+sub inc_message_header_linecount {
+ my ($msgid) = @_;
+ my $name_in = "${msgid}-H";
+ my $name_out = "${msgid}-chunkfix";
+
+ open(my $in, '<:perlio', $name_in) or do { warn "open(${name_in}) failed: $!\n"; return -1 };
+ open(my $out, '>:perlio', $name_out) or do { warn "write-open(${name_out}) failed: $!\n"; return -1 };
+ my $seen = 0;
+ my $lc;
+ foreach (<$in>) {
+ if ($seen) {
+ print {$out} $_;
+ next;
+ }
+ if (/^(-body_linecount\s+)(\d+)(\s*)$/) {
+ $lc = $2 + 1;
+ print {$out} "${1}${lc}${3}";
+ $seen = 1;
+ next;
+ }
+ print {$out} $_;
+ }
+ close($in) or do {
+ warn "read-close(${msgid}-H) failed, assuming incomplete: $!\n";
+ close($out);
+ unlink $name_out;
+ return -1;
+ };
+ close($out) or do {
+ warn "write-close(${msgid}-chunkfix) failed, aborting: $!\n";
+ unlink $name_out;
+ return -1;
+ };
+
+ my @target = stat($name_in) or do { warn "stat($name_in) failed: $!\n"; unlink $name_out; return -1 };
+ my @created = stat($name_out) or do { warn "stat($name_out) failed: $!\n"; unlink $name_out; return -1 };
+ # 4=uid, 5=gid, 2=mode
+ if (($created[5] != $target[5]) or ($created[4] != $target[4])) {
+ chown $target[4], $target[5], $name_out or do {
+ warn "chown($name_out) failed: $!\n";
+ unlink $name_out;
+ return -1;
+ };
+ }
+ if (($created[2]&07777) != ($target[2]&0x7777)) {
+ chmod $target[2]&0x7777, $name_out or do {
+ warn "chmod($name_out) failed: $!\n";
+ unlink $name_out;
+ return -1;
+ };
+ }
+
+ rename $name_out, $name_in or do {
+ warn "rename '${msgid}-chunkfix' -> '${msgid}-H' failed: $!\n";
+ unlink $name_out;
+ return -1;
+ };
+
+ print "${msgid}: linecount set to $lc\n";
+ return 1;
+}
+
+find({wanted => \&each_found_file}, '.');
git://git.exim.org / exim.git / commitdiff