1 files changed, 54 insertions, 0 deletions
diff --git a/src/src/environment.c b/src/src/environment.c
new file mode 100644
index 000000000..aaa84f817
--- /dev/null
+++ b/src/src/environment.c
@@ -0,0 +1,54 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) Heiko Schlittermann 2016
+ * hs@schlittermann.de
+ * See the file NOTICE for conditions of use and distribution.
+ */
+
+#include "exim.h"
+
+/* The cleanup_environment() function is used during the startup phase
+of the Exim process, right after reading the configurations main
+part, before any expansions take place. It retains the environment
+variables we trust (via the keep_environment option) and allows to
+set additional variables (via add_environment).
+
+Returns:    TRUE if successful
+            FALSE otherwise
+*/
+
+BOOL
+cleanup_environment()
+{
+if (!keep_environment || *keep_environment == '\0')
+  clearenv();
+else if (Ustrcmp(keep_environment, "*") != 0)
+  {
+  uschar **p;
+  if (environ) for (p = USS environ; *p; /* see below */)
+    {
+    uschar *name = string_copyn(*p, US Ustrchr(*p, '=') - *p);
+
+    if (OK != match_isinlist(name, CUSS &keep_environment,
+        0, NULL, NULL, MCL_NOEXPAND, FALSE, NULL))
+      if (unsetenv(CS name) < 0) return FALSE;
+      else /* nothing */;
+    else
+      p++;
+
+    store_reset(name);
+    }
+  }
+if (add_environment)
+  {
+    uschar *p;
+    int sep = 0;
+    const uschar* envlist = add_environment;
+    while ((p = string_nextinlist(&envlist, &sep, NULL, 0)))
+        putenv(CS p);
+  }
+
+  return TRUE;
+}