send-email: improve RFC2047 quote parsing

The RFC2047 unquoting, used to parse email addresses in From and Cc
headers, is broken in several ways:

* It erroneously substitutes ' ' for '_' in *the whole* header, even
  outside the quoted field. [Noticed by Christoph.]

* It is too liberal in its matching, and happily matches the start
  of one quoted chunk against the end of another, or even just
  something that looks like such an end. [Noticed by Junio.]

* It fundamentally cannot cope with encodings that are not a
  superset of ASCII, nor several (incompatible) encodings in the
  same header.

This patch fixes the first two by doing a more careful decoding of
the outer quoting (e.g. "=AB" to represent an octet whose value is
0xAB).  Fixing the fundamental issues is left for a future, more
intrusive, patch.

Noticed-by: Christoph Miebach <christoph.miebach@web.de>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-send-email.perl b/git-send-email.perl
index ef30c557c7dee549e891fe7605902ba58d0566a3..664713709c0b6e6e4974faa8f0800df2f0beb8e5 100755 (executable)
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -862,11 +862,13 @@ $time = time - scalar $#files;
 sub unquote_rfc2047 {
        local ($_) = @_;
        my $encoding;
-       if (s/=\?([^?]+)\?q\?(.*)\?=/$2/g) {
+       s{=\?([^?]+)\?q\?(.*?)\?=}{
                $encoding = $1;
-               s/_/ /g;
-               s/=([0-9A-F]{2})/chr(hex($1))/eg;
-       }
+               my $e = $2;
+               $e =~ s/_/ /g;
+               $e =~ s/=([0-9A-F]{2})/chr(hex($1))/eg;
+               $e;
+       }eg;
        return wantarray ? ($_, $encoding) : $_;
 }
 

diff --git a/t/t9001-send-email.sh b/t/t9001-send-email.sh
index 8c12c65c72658acb37fa715fc93756381bc824bb..035122808b6e859810ee70daf381c2c895527894 100755 (executable)
--- a/t/t9001-send-email.sh
+++ b/t/t9001-send-email.sh
@@ -841,6 +841,19 @@ test_expect_success $PREREQ '--compose adds MIME for utf8 subject' '
        grep "^Subject: =?UTF-8?q?utf8-s=C3=BCbj=C3=ABct?=" msgtxt1
 '
 
+test_expect_success $PREREQ 'utf8 author is correctly passed on' '
+       clean_fake_sendmail &&
+       test_commit weird_author &&
+       test_when_finished "git reset --hard HEAD^" &&
+       git commit --amend --author "Füñný Nâmé <odd_?=mail@example.com>" &&
+       git format-patch --stdout -1 >funny_name.patch &&
+       git send-email --from="Example <nobody@example.com>" \
+         --to=nobody@example.com \
+         --smtp-server="$(pwd)/fake.sendmail" \
+         funny_name.patch &&
+       grep "^From: Füñný Nâmé <odd_?=mail@example.com>" msgtxt1
+'
+
 test_expect_success $PREREQ 'detects ambiguous reference/file conflict' '
        echo master > master &&
        git add master &&