Don't erroneously reject some option names in --dhcp-match

CHANGELOG

@@ -46,6 +46,9 @@ version 2.66
 	    Add --ipset option. Thanks to Jason A. Donenfeld for the 
 	    patch.
 
+	    Don't erroneously reject some option names in --dhcp-match
+	    options. Thnaks to Benedikt Hochstrasser for the bug report.
+
 
 version 2.65
 	    Fix regression which broke forwarding of queries sent via

src/dhcp-common.c

@@ -518,8 +518,7 @@ u16 lookup_dhcp_opt(int prot, char *name)
     t = opttab;
 
   for (i = 0; t[i].name; i++)
-    if (!(t[i].size & OT_INTERNAL) &&
-	strcasecmp(t[i].name, name) == 0)
+    if (strcasecmp(t[i].name, name) == 0)
       return t[i].val;
   
   return 0;
@@ -539,14 +538,9 @@ u16 lookup_dhcp_len(int prot, u16 val)
 
   for (i = 0; t[i].name; i++)
     if (val == t[i].val)
-      {
-	if (t[i].size & OT_INTERNAL)
-	  return 0;
-	
-	return t[i].size & ~OT_DEC;
-      }
- 
-  return 0;
+      return t[i].size & ~OT_DEC;
+
+   return 0;
 }
 
 char *option_string(int prot, unsigned int opt, unsigned char *val, int opt_len, char *buf, int buf_len)

src/option.c

@@ -768,6 +768,8 @@ static int parse_dhcp_opt(char *errstr, char *arg, int flags)
 	  new->opt = lookup_dhcp_opt(AF_INET, arg+7);
 	  opt_len = lookup_dhcp_len(AF_INET, new->opt);
 	  /* option:<optname> must follow tag and vendor string. */
+	  if ((opt_len & OT_INTERNAL) && flags != DHOPT_MATCH)
+	    new->opt = 0;
 	  break;
 	}
 #ifdef HAVE_DHCP6
@@ -786,6 +788,8 @@ static int parse_dhcp_opt(char *errstr, char *arg, int flags)
 	    {
 	      new->opt = lookup_dhcp_opt(AF_INET6, arg+8);
 	      opt_len = lookup_dhcp_len(AF_INET6, new->opt);
+	      if ((opt_len & OT_INTERNAL) && flags != DHOPT_MATCH)
+		new->opt = 0;
 	    }
 	  /* option6:<opt>|<optname> must follow tag and vendor string. */
 	  is6 = 1;