From ebb74077eee67e729300b3be193482192975fa19 Mon Sep 17 00:00:00 2001
From: manuel <manuel@mausz.at>
Date: Mon, 15 Oct 2018 13:58:07 +0200
Subject: plus addressing improvements

* first `+` splits local part from sub-address
* prioritize plus addressing over domain wildcards
---
 qmail-send.c | 34 +++++++++++++++++++++-------------
 realrcptto.c | 23 +++++++++++++----------
 2 files changed, 34 insertions(+), 23 deletions(-)

diff --git a/qmail-send.c b/qmail-send.c
index 6eac4d5..8c6237e 100644
--- a/qmail-send.c
+++ b/qmail-send.c
@@ -149,21 +149,18 @@ char *recip;
     return 1;
   }
 
-  for (i = 0;i <= addr.len;++i)
-    if (!i || (i == at + 1) || (i == addr.len) || ((i > at) && (addr.s[i] == '.')))
-      if (x = constmap(&mapvdoms,addr.s + i,addr.len - i)) {
-        if (!*x) break;
-        if (!stralloc_cats(&rwline,x)) return 0;
-        if (!stralloc_cats(&rwline,"-")) return 0;
-        if (!stralloc_cat(&rwline,&addr)) return 0;
-        if (!stralloc_0(&rwline)) return 0;
-        return 1;
-      }
- 
+  if ((x = constmap(&mapvdoms, addr.s, addr.len)) && (*x)) {
+    if (!stralloc_cats(&rwline,x)) return 0;
+    if (!stralloc_cats(&rwline,"-")) return 0;
+    if (!stralloc_cat(&rwline,&addr)) return 0;
+    if (!stralloc_0(&rwline)) return 0;
+    return 1;
+  }
+
+  /* sub-addressing: ignore first and last character in local part */
   static stralloc newaddr = {0};
-  for (i = at; i > 0; --i) {
+  for (i = 1; i < at - 1; ++i) {
     if (addr.s[i] == '+' /*|| addr.s[i] == '-'*/) {
-      if (i == at - 1) break;
       if (!stralloc_copyb(&newaddr, addr.s, i)) return 0;
       if (!stralloc_catb(&newaddr, addr.s + at, addr.len - at)) return 0;
       if (x = constmap(&mapvdoms, newaddr.s, newaddr.len)) {
@@ -179,6 +176,17 @@ char *recip;
     }
   }
 
+  for (i = at + 1;i <= addr.len;++i)
+    if ((i == at + 1) || (i == addr.len) || ((i > at) && (addr.s[i] == '.')))
+      if (x = constmap(&mapvdoms,addr.s + i,addr.len - i)) {
+        if (!*x) break;
+        if (!stralloc_cats(&rwline,x)) return 0;
+        if (!stralloc_cats(&rwline,"-")) return 0;
+        if (!stralloc_cat(&rwline,&addr)) return 0;
+        if (!stralloc_0(&rwline)) return 0;
+        return 1;
+      }
+
   if (!stralloc_cat(&rwline,&addr)) return 0;
   if (!stralloc_0(&rwline)) return 0;
   return 2;
diff --git a/realrcptto.c b/realrcptto.c
index 93a7aad..0f275ba 100644
--- a/realrcptto.c
+++ b/realrcptto.c
@@ -173,17 +173,20 @@ static char *virtualext(stralloc *localpart, unsigned int at)
   unsigned int i;
   char *x;
 
-  for (i = at; i > 0; --i)
-    if (localpart->s[i] == '+' /*|| localpart->s[i] == '-'*/) break;
-  if (i == 0 || i == at - 1) return NULL;
-
-  if (!stralloc_copyb(&newaddr, localpart->s, i)) die_nomem();
-  if (!stralloc_catb(&newaddr, localpart->s + at, localpart->len - at)) die_nomem();
-  x = constmap(&mapvdoms, newaddr.s, newaddr.len);
-  if (!x) return NULL;
+  /* sub-addressing: ignore first and last character in local part */
+  for (i = 1; i < at - 1; ++i) {
+    if (localpart->s[i] == '+' /*|| localpart->s[i] == '-'*/) {
+      if (!stralloc_copyb(&newaddr, localpart->s, i)) die_nomem();
+      if (!stralloc_catb(&newaddr, localpart->s + at, localpart->len - at)) die_nomem();
+      x = constmap(&mapvdoms, newaddr.s, newaddr.len);
+      if (!x) return NULL;
+
+      localpart->s[i] = '-';
+      return x;
+    }
+  }
 
-  localpart->s[i] = '-';
-  return x;
+  return NULL;
 }
 
 // max lookups
-- 
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