New expansion operator: reverse_ip

[exim.git] / src / src / expand.c

diff --git a/src/src/expand.c b/src/src/expand.c
index 6e47125bb1f177a3fa6af8a9807c9cd600e743da..e5daff1a89447ac1762827c79cd0cab7ba54a591 100644 (file)
--- a/src/src/expand.c
+++ b/src/src/expand.c
@@ -1,4 +1,4 @@
-/* $Cambridge: exim/src/src/expand.c,v 1.105 2009/11/16 19:50:36 nm4 Exp $ */
+/* $Cambridge: exim/src/src/expand.c,v 1.106 2010/06/05 23:50:18 pdp Exp $ */
 
 /*************************************************
 *     Exim - an Internet mail transport agent    *
@@ -156,6 +156,7 @@ static uschar *op_table_underscore[] = {
   US"from_utf8",
   US"local_part",
   US"quote_local_part",
+  US"reverse_ip",
   US"time_eval",
   US"time_interval"};
 
@@ -163,6 +164,7 @@ enum {
   EOP_FROM_UTF8,
   EOP_LOCAL_PART,
   EOP_QUOTE_LOCAL_PART,
+  EOP_REVERSE_IP,
   EOP_TIME_EVAL,
   EOP_TIME_INTERVAL };
 
@@ -5790,6 +5792,25 @@ while (*s != 0)
         continue;
         }
 
+      /* Reverse IP, including IPv6 to dotted-nibble */
+
+      case EOP_REVERSE_IP:
+        {
+        int family, maskptr;
+        uschar reversed[128];
+
+        family = string_is_ip_address(sub, &maskptr);
+        if (family == 0)
+          {
+          expand_string_message = string_sprintf(
+              "reverse_ip() not given an IP address [%s]", sub);
+          goto EXPAND_FAILED;
+          }
+        invert_address(reversed, sub);
+        yield = string_cat(yield, &size, &ptr, reversed, Ustrlen(reversed));
+        continue;
+        }
+
       /* Unknown operator */
 
       default: