Bug #503: Use Ulstat() instead of Ustat() in dsearch lookup.

2 files changed, 15 insertions, 8 deletions

diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index d292d99ec..d3ee4bc16 100644
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -1,4 +1,4 @@
-$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.509 2007/05/17 19:58:48 tom Exp $
+$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.510 2007/05/31 12:41:49 magnus Exp $
 
 Change log file for Exim from version 4.21
 -------------------------------------------
@@ -38,6 +38,13 @@ MH/01 The "spam" ACL condition code contained a sscanf() call with a %s
 TK/02 Bugzilla 502: Apply patch to make the SPF-Received: header use
       $primary_hostname instead of what libspf2 thinks the hosts name is.
 
+MH/02 The dsearch lookup now uses lstat(2) instead of stat(2) to look for
+      a directory entry by the name of the lookup key. Previously, if a
+      symlink pointed to a non-existing file or a file in a directory that
+      Exim lacked permissions to read, a lookup for a key matching that
+      symlink would fail. Now it is enough that a matching directory entry
+      exists, symlink or not. (Bugzilla 503.)
+
 
 Exim version 4.67
 -----------------
diff --git a/src/src/lookups/dsearch.c b/src/src/lookups/dsearch.c
index 38bedc28c..ecdf242a0 100644
--- a/src/src/lookups/dsearch.c
+++ b/src/src/lookups/dsearch.c
@@ -1,4 +1,4 @@
-/* $Cambridge: exim/src/src/lookups/dsearch.c,v 1.4 2007/01/08 10:50:19 ph10 Exp $ */
+/* $Cambridge: exim/src/src/lookups/dsearch.c,v 1.5 2007/05/31 12:42:07 magnus Exp $ */
 
 /*************************************************
 *     Exim - an Internet mail transport agent    *
@@ -8,8 +8,8 @@
 /* See the file NOTICE for conditions of use and distribution. */
 
 /* The idea for this code came from Matthew Byng-Maddick, but his original has
-been heavily reworked a lot for Exim 4 (and it now uses stat() rather than a
-directory scan). */
+been heavily reworked a lot for Exim 4 (and it now uses stat() (more precisely:
+lstat()) rather than a directory scan). */
 
 
 #include "../exim.h"
@@ -24,7 +24,7 @@ directory scan). */
 
 /* See local README for interface description. We open the directory to test
 whether it exists and whether it is searchable. However, we don't need to keep
-it open, because the "search" can be done by a call to stat() rather than
+it open, because the "search" can be done by a call to lstat() rather than
 actually scanning through the list of files. */
 
 void *
@@ -64,7 +64,7 @@ return lf_check_file(-1, filename, S_IFDIR, modemask, owners, owngroups,
 *              Find entry point                  *
 *************************************************/
 
-/* See local README for interface description. We use stat() instead of
+/* See local README for interface description. We use lstat() instead of
 scanning the directory, as it is hopefully faster to let the OS do the scanning
 for us. */
 
@@ -93,7 +93,7 @@ if (!string_format(filename, sizeof(filename), "%s/%s", dirname, keystring))
   return DEFER;
   }
 
-if (Ustat(filename, &statbuf) >= 0)
+if (Ulstat(filename, &statbuf) >= 0)
   {
   *result = string_copy(keystring);
   return OK;
@@ -102,7 +102,7 @@ if (Ustat(filename, &statbuf) >= 0)
 if (errno == ENOENT) return FAIL;
 
 save_errno = errno;
-*errmsg = string_sprintf("%s: stat failed", filename);
+*errmsg = string_sprintf("%s: lstat failed", filename);
 errno = save_errno;
 return DEFER;
 }