common: Prepare for parsing mail sub-addresses.

* common/mbox-util.c (mailbox_from_userid): Add arg subaddress and
implement.  Change all callers to pass false for it.

* common/t-mbox-util.c (run_mbox_no_sub_test): New.
(run_filter): Add arg no_sub.
(main): Call new test and add option --no-sub.
--

Some stats: In the about 5300000 keys on the SKS servers we found 3055
unique mailboxes with a '+' in it.  After removing leading and
trailing '+' as well as multiple '+' (e.g. "c++" or "foo+bar+baz")
2697 were left which seem to be valid sub-addresses.

To filter mailboxes out from a line delimited list with
user-ids (e.g. an SQL output), the command

   t-mbox-util --verbose --filter

can be used; to output w/o sub-addresses add --no-sub.

GnuPG-bug-id: 4200
Signed-off-by: Werner Koch <[email protected]>

1 files changed, 2 insertions, 2 deletions

diff --git a/dirmngr/server.c b/dirmngr/server.c
index 05a530bce..a21e1abb6 100644
--- a/dirmngr/server.c
+++ b/dirmngr/server.c
@@ -731,7 +731,7 @@ cmd_dns_cert (assuan_context_t ctx, char *line)
       /* We lowercase ascii characters but the DANE I-D does not allow
          this.  FIXME: Check after the release of the RFC whether to
          change this.  */
-      mbox = mailbox_from_userid (line);
+      mbox = mailbox_from_userid (line, 0);
       if (!mbox || !(domain = strchr (mbox, '@')))
         {
           err = set_error (GPG_ERR_INV_USER_ID, "no mailbox in user id");
@@ -855,7 +855,7 @@ proc_wkd_get (ctrl_t ctrl, assuan_context_t ctx, char *line)
   line = skip_options (line);
   is_wkd_query = !(opt_policy_flags || opt_submission_addr);
 
-  mbox = mailbox_from_userid (line);
+  mbox = mailbox_from_userid (line, 0);
   if (!mbox || !(domain = strchr (mbox, '@')))
     {
       err = set_error (GPG_ERR_INV_USER_ID, "no mailbox in user id");