Implement plus addressing for virtualdomains

1 files changed, 24 insertions, 1 deletions

diff --git a/realrcptto.c b/realrcptto.c
index 866bd57..e18a21f 100644
--- a/realrcptto.c
+++ b/realrcptto.c
@@ -165,6 +165,25 @@ static int userext()
   }
 }
 
+static char *virtualext(stralloc *localpart, unsigned int at)
+{
+  static stralloc newaddr = {0};
+  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;
+
+  localpart->s[i] = '-';
+  return x;
+}
+
 // max lookups
 #define MAXRECURSION 5
 
@@ -286,7 +305,11 @@ int depth;
     unsigned int xlen,newlen;
     char *x;
     for (i = 0;;++i) {
-      if (i > localpart.len) return denyaddr(addr, depth);
+      if (i > localpart.len) {
+        x = virtualext(&localpart, at);
+        if (x) break;
+        return denyaddr(addr, depth);
+      }
       if (!i || (i == at + 1) || (i == localpart.len) ||
           ((i > at) && (localpart.s[i] == '.'))) {
         x = constmap(&mapvdoms,localpart.s + i,localpart.len - i);