Added bool_lax{} expansion operator, which uses Router condition logic to

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

diff --git a/src/src/expand.c b/src/src/expand.c
index 0e7d31d973afbf437de421c556621f930d334a83..9f9cbb7befffed14bd4074ac55af4b8bc2ece200 100644 (file)
--- a/src/src/expand.c
+++ b/src/src/expand.c
@@ -1,10 +1,10 @@
-/* $Cambridge: exim/src/src/expand.c,v 1.104 2009/10/16 09:10:40 tom Exp $ */
+/* $Cambridge: exim/src/src/expand.c,v 1.107 2010/06/07 08:23:20 pdp Exp $ */
 
 /*************************************************
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2007 */
+/* Copyright (c) University of Cambridge 1995 - 2009 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 
@@ -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 };
 
@@ -245,6 +247,7 @@ static uschar *cond_table[] = {
   US">=",
   US"and",
   US"bool",
+  US"bool_lax",
   US"crypteq",
   US"def",
   US"eq",
@@ -287,6 +290,7 @@ enum {
   ECOND_NUM_GE,
   ECOND_AND,
   ECOND_BOOL,
+  ECOND_BOOL_LAX,
   ECOND_CRYPTEQ,
   ECOND_DEF,
   ECOND_STR_EQ,
@@ -732,6 +736,8 @@ or "false" value. Failure of the expansion yields FALSE; logged unless it was a
 forced fail or lookup defer. All store used by the function can be released on
 exit.
 
+The actual false-value tests should be replicated for ECOND_BOOL_LAX.
+
 Arguments:
   condition     the condition string
   m1            text to be incorporated in panic error
@@ -2489,19 +2495,25 @@ switch(cond_type)
   interpretation, where general data can be used and only a few values
   map to FALSE.
   Note that readconf.c boolean matching, for boolean configuration options,
-  only matches true/yes/false/no. */
+  only matches true/yes/false/no.
+  The bool_lax{} condition matches the Router logic, which is much more
+  liberal. */
   case ECOND_BOOL:
+  case ECOND_BOOL_LAX:
     {
     uschar *sub_arg[1];
     uschar *t;
+    uschar *ourname;
     size_t len;
     BOOL boolvalue = FALSE;
     while (isspace(*s)) s++;
     if (*s != '{') goto COND_FAILED_CURLY_START;
-    switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, US"bool"))
+    ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool";
+    switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, ourname))
       {
-      case 1: expand_string_message = US"too few arguments or bracketing "
-        "error for bool";
+      case 1: expand_string_message = string_sprintf(
+                  "too few arguments or bracketing error for %s",
+                  ourname);
       /*FALLTHROUGH*/
       case 2:
       case 3: return NULL;
@@ -2510,15 +2522,25 @@ switch(cond_type)
     while (isspace(*t)) t++;
     len = Ustrlen(t);
     DEBUG(D_expand)
-      debug_printf("considering bool: %s\n", len ? t : US"<empty>");
+      debug_printf("considering %s: %s\n", ourname, len ? t : US"<empty>");
+    /* logic for the lax case from expand_check_condition(), which also does
+    expands, and the logic is both short and stable enough that there should
+    be no maintenance burden from replicating it. */
     if (len == 0)
       boolvalue = FALSE;
     else if (Ustrspn(t, "0123456789") == len)
+      {
       boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
+      /* expand_check_condition only does a literal string "0" check */
+      if ((cond_type == ECOND_BOOL_LAX) && (len > 1))
+        boolvalue = TRUE;
+      }
     else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0)
       boolvalue = TRUE;
     else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0)
       boolvalue = FALSE;
+    else if (cond_type == ECOND_BOOL_LAX)
+      boolvalue = TRUE;
     else
       {
       expand_string_message = string_sprintf("unrecognised boolean "
@@ -5790,6 +5812,25 @@ 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: