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[exim.git] / src / src / routers / rf_get_ugid.c

diff --git a/src/src/routers/rf_get_ugid.c b/src/src/routers/rf_get_ugid.c
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+++ b/src/src/routers/rf_get_ugid.c
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+/* $Cambridge: exim/src/src/routers/rf_get_ugid.c,v 1.1 2004/10/07 13:10:02 ph10 Exp $ */
+
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 1995 - 2004 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+#include "../exim.h"
+#include "rf_functions.h"
+
+
+/*************************************************
+*            Get uid/gid for a router            *
+*************************************************/
+
+/* This function is called by routers to sort out the uid/gid values which are
+passed with an address for use by local transports.
+
+Arguments:
+  rblock       the router block
+  addr         the address being worked on
+  ugid         pointer to a ugid block to fill in
+
+Returns:       TRUE if all goes well, else FALSE
+*/
+
+BOOL
+rf_get_ugid(router_instance *rblock, address_item *addr, ugid_block *ugid)
+{
+struct passwd *upw = NULL;
+
+/* Initialize from fixed values */
+
+ugid->uid = rblock->uid;
+ugid->gid = rblock->gid;
+ugid->uid_set = rblock->uid_set;
+ugid->gid_set = rblock->gid_set;
+ugid->initgroups = rblock->initgroups;
+
+/* If there is no fixed uid set, see if there's a dynamic one that can
+be expanded and possibly looked up. */
+
+if (!ugid->uid_set && rblock->expand_uid != NULL)
+  {
+  if (route_find_expanded_user(rblock->expand_uid, rblock->name, US"router",
+    &upw, &(ugid->uid), &(addr->message))) ugid->uid_set = TRUE;
+  else return FALSE;
+  }
+
+/* Likewise for the gid */
+
+if (!ugid->gid_set && rblock->expand_gid != NULL)
+  {
+  if (route_find_expanded_group(rblock->expand_gid, rblock->name, US"router",
+    &(ugid->gid), &(addr->message))) ugid->gid_set = TRUE;
+  else return FALSE;
+  }
+
+/* If a uid is set, then a gid must also be available; use one from the passwd
+lookup if it happened. */
+
+if (ugid->uid_set && !ugid->gid_set)
+  {
+  if (upw != NULL)
+    {
+    ugid->gid = upw->pw_gid;
+    ugid->gid_set = TRUE;
+    }
+  else
+    {
+    addr->message = string_sprintf("user set without group for %s router",
+      rblock->name);
+    return FALSE;
+    }
+  }
+
+return TRUE;
+}
+
+/* End of rf_get_ugid.c */