Fix bugs in OSPF MD5 authentication. First bug is that default

values for MD5 password ID changed during reconfigure, Second
bug is that BIRD chooses password in first-fit manner, but RFC
says that it should use the one with the latest generate-from.

It also modifies the syntax for multiple passwords.
Now it is possible to just add more 'password' statements
to the interface section and it is not needed to use
'passwords' section. Old syntax can be used too.

nest/config.Y

@@ -20,6 +20,16 @@ static struct proto_config *this_proto;
 static struct iface_patt *this_ipatt;
 static list *this_p_list;
 static struct password_item *this_p_item;
+static int password_id;
+
+static list *
+get_passwords(void)
+{
+  list *rv = this_p_list;
+  this_p_list = NULL;
+  return rv;
+}
+
 
 CF_DECLS
 
@@ -37,7 +47,6 @@ CF_ENUM(T_ENUM_RTD, RTD_, ROUTER, DEVICE, BLACKHOLE, UNREACHABLE, PROHIBIT)
 %type <i32> idval
 %type <f> imexport
 %type <r> rtable
-%type <p> password_list password_begin password_begin_list
 %type <s> optsym
 %type <ra> r_args
 %type <i> echo_mask echo_size debug_mask debug_list debug_flag import_or_proto
@@ -197,6 +206,11 @@ debug_flag:
 
 /* Password lists */
 
+password_list:
+   PASSWORDS '{' password_items '}'
+ | password_item
+;
+
 password_items: 
     /* empty */
   | password_item ';' password_items
@@ -209,14 +223,18 @@ password_item:
 
 password_item_begin:
    PASSWORD TEXT {
-     static int id = 1;
+     if (!this_p_list) {
+     	this_p_list = cfg_alloc(sizeof(list));
+     	init_list(this_p_list);
+        password_id = 1;
+     }
      this_p_item = cfg_alloc(sizeof (struct password_item));
      this_p_item->password = $2;
      this_p_item->genfrom = 0;
      this_p_item->gento = TIME_INFINITY;
      this_p_item->accfrom = 0;
      this_p_item->accto = TIME_INFINITY;
-     this_p_item->id = id++;
+     this_p_item->id = password_id++;
      add_tail(this_p_list, &this_p_item->n);
    }
 ;
@@ -230,36 +248,6 @@ password_item_params:
  | ID expr ';' password_item_params { this_p_item->id = $2; if ($2 <= 0) cf_error("Password ID has to be greated than zero."); }
  ;
 
-password_list:
-   password_begin_list '{' password_items '}' {
-     $$ = $1;
-   }
- | password_begin
-;
-
-password_begin_list:
-  PASSWORDS {
-     this_p_list = cfg_alloc(sizeof(list));
-     init_list(this_p_list);
-     $$ = (void *) this_p_list;
-  }
-;
-
-password_begin:
-  PASSWORD TEXT {
-     this_p_list = cfg_alloc(sizeof(list));
-     init_list(this_p_list);
-     this_p_item = cfg_alloc(sizeof (struct password_item));
-     this_p_item->password = $2;
-     this_p_item->genfrom = 0;
-     this_p_item->gento = TIME_INFINITY;
-     this_p_item->accfrom = 0;
-     this_p_item->accto = TIME_INFINITY;
-     this_p_item->id = 1;
-     add_tail(this_p_list, &this_p_item->n);
-     $$ = (void *) this_p_list;
-  }
-;
 
 /* Core commands */
 CF_CLI_HELP(SHOW, ..., [[Show status information]])

nest/password.c

@@ -14,19 +14,26 @@
 struct password_item *last_password_item = NULL;
 
 struct password_item *
-password_find(list *l)
+password_find(list *l, int first_fit)
 {
   struct password_item *pi;
+  struct password_item *pf = NULL;
 
   if (l)
   {
     WALK_LIST(pi, *l)
     {
       if ((pi->genfrom < now_real) && (pi->gento > now_real))
-        return pi;
+      {
+	if (first_fit)
+	  return pi;
+
+	if (!pf || pf->genfrom < pi->genfrom)
+	  pf = pi;
+      }
     }
   }
-  return NULL;
+  return pf;
 }
 
 void password_cpy(char *dst, char *src, int size)

nest/password.h

@@ -22,7 +22,7 @@ struct password_item {
 
 extern struct password_item *last_password_item;
 
-struct password_item *password_find(list *);
+struct password_item *password_find(list *l, int first_fit);
 void password_cpy(char *dst, char *src, int size);
 
 #endif