Conf: Better error message when reading iproute2 config

Reported by: Martin Weinelt <martin@darmstadt.freifunk.net>

1 files changed, 8 insertions, 4 deletions

diff --git a/sysdep/unix/main.c b/sysdep/unix/main.c
index d9d9ad84..5209b9b3 100644
--- a/sysdep/unix/main.c
+++ b/sysdep/unix/main.c
@@ -95,11 +95,15 @@ drop_gid(gid_t gid)
 #ifdef PATH_IPROUTE_DIR
 
 static inline void
-add_num_const(char *name, int val)
+add_num_const(char *name, int val, const char *file, const uint line)
 {
   struct f_val *v = cfg_alloc(sizeof(struct f_val));
   *v = (struct f_val) { .type = T_INT, .val.i = val };
-  cf_define_symbol(cf_get_symbol(name), SYM_CONSTANT | T_INT, val, v);
+  struct symbol *sym = cf_get_symbol(name);
+  if (sym->class && (sym->scope == conf_this_scope))
+    cf_error("Error reading value for %s from %s:%d: already defined", name, file, line);
+
+  cf_define_symbol(sym, SYM_CONSTANT | T_INT, val, v);
 }
 
 /* the code of read_iproute_table() is based on
@@ -119,7 +123,7 @@ read_iproute_table(char *file, char *prefix, int max)
   if (!fp)
     return;
 
-  while (fgets(buf, sizeof(buf), fp))
+  for (uint line = 1; fgets(buf, sizeof(buf), fp); line++)
   {
     char *p = buf;
 
@@ -142,7 +146,7 @@ read_iproute_table(char *file, char *prefix, int max)
       if ((*p < 'a' || *p > 'z') && (*p < 'A' || *p > 'Z') && (*p < '0' || *p > '9') && (*p != '_'))
 	*p = '_';
 
-    add_num_const(namebuf, val);
+    add_num_const(namebuf, val, file, line);
   }
 
   fclose(fp);