Fix deletion of dhcp-options from inotify dynamic files.

These were not deleted except in the case that a dhcp-optsfile
option was coincidentally provided.

CHANGELOG

@@ -46,6 +46,10 @@ version 2.79
 	http://cs.northwestern.edu/~ychen/Papers/DNS_ToN15.pdf
 	Thanks to Mattias Hellström for the initial patch.
 
+	Fix failure to delete dynamically created dhcp options
+	from files in -dhcp-optsdir directories. Thanks to
+	Lindgren Fredrik for the bug report.
+	
 
 version 2.78
         Fix logic of appending ".<layer>" to PXE basename. Thanks to Chris

src/dnsmasq.c

@@ -1511,9 +1511,6 @@ void clear_cache_and_reload(time_t now)
       if (option_bool(OPT_ETHERS))
 	dhcp_read_ethers();
       reread_dhcp();
-#ifdef HAVE_INOTIFY
-      set_dynamic_inotify(AH_DHCP_HST | AH_DHCP_OPT, 0, NULL, 0);
-#endif
       dhcp_update_configs(daemon->dhcp_conf);
       lease_update_from_configs(); 
       lease_update_file(now); 

src/option.c

@@ -4328,7 +4328,7 @@ static void read_file(char *file, FILE *f, int hard_opt)
   fclose(f);
 }
 
-#ifdef HAVE_DHCP
+#if defined(HAVE_DHCP) && defined(HAVE_INOTIFY)
 int option_read_dynfile(char *file, int flags)
 {
   my_syslog(MS_DHCP | LOG_INFO, _("read %s"), file);
@@ -4529,12 +4529,8 @@ void read_servers_file(void)
  
 
 #ifdef HAVE_DHCP
-void reread_dhcp(void)
+static void clear_dynamic_conf(void)
 {
-  struct hostsfile *hf;
-
-  if (daemon->dhcp_hosts_file)
-    {
   struct dhcp_config *configs, *cp, **up;
   
   /* remove existing... */
@@ -4572,18 +4568,10 @@ void reread_dhcp(void)
       else
 	up = &configs->next;
     }
+}
 
-      daemon->dhcp_hosts_file = expand_filelist(daemon->dhcp_hosts_file);
-      for (hf = daemon->dhcp_hosts_file; hf; hf = hf->next)
-	 if (!(hf->flags & AH_INACTIVE))
-	   {
-	     if (one_file(hf->fname, LOPT_BANK))  
-	       my_syslog(MS_DHCP | LOG_INFO, _("read %s"), hf->fname);
-	   }
-    }
-
-  if (daemon->dhcp_opts_file)
-    {
+static void clear_dynamic_opt(void)
+{
   struct dhcp_opt *opts, *cp, **up;
   struct dhcp_netid *id, *next;
 
@@ -4608,7 +4596,32 @@ void reread_dhcp(void)
       else
 	up = &opts->next;
     }
+}
 
+void reread_dhcp(void)
+{
+   struct hostsfile *hf;
+
+   /* Do these even if there is no daemon->dhcp_hosts_file or
+      daemon->dhcp_opts_file since entries may have been created by the
+      inotify dynamic file reading system. */
+   
+   clear_dynamic_conf();
+   clear_dynamic_opt();
+
+   if (daemon->dhcp_hosts_file)
+    {
+      daemon->dhcp_hosts_file = expand_filelist(daemon->dhcp_hosts_file);
+      for (hf = daemon->dhcp_hosts_file; hf; hf = hf->next)
+	if (!(hf->flags & AH_INACTIVE))
+	  {
+	    if (one_file(hf->fname, LOPT_BANK))  
+	      my_syslog(MS_DHCP | LOG_INFO, _("read %s"), hf->fname);
+	  }
+    }
+
+  if (daemon->dhcp_opts_file)
+    {
       daemon->dhcp_opts_file = expand_filelist(daemon->dhcp_opts_file);
       for (hf = daemon->dhcp_opts_file; hf; hf = hf->next)
 	if (!(hf->flags & AH_INACTIVE))
@@ -4617,6 +4630,11 @@ void reread_dhcp(void)
 	      my_syslog(MS_DHCP | LOG_INFO, _("read %s"), hf->fname);
 	  }
     }
+
+#  ifdef HAVE_INOTIFY
+  /* Setup notify and read pre-existing files. */
+  set_dynamic_inotify(AH_DHCP_HST | AH_DHCP_OPT, 0, NULL, 0);
+#  endif
 }
 #endif