Testing various option constraints.
   
   -- Testcase --
   {%
           include("./root/usr/share/firewall4/main.uc", {
                   getenv: function(varname) {
                           switch (varname) {
                           case 'ACTION':
                                   return 'print';
                          }
                  }
          })
  %}
  -- End --
  
  -- File uci/helpers.json --
  {}
  -- End --
  
  -- File uci/firewall.json --
  {
          "zone": [
                  {
                          "name": "lan"
                  }
          ],
          "rule": [
                  {
                          ".description": "Helper rules require an explicit source zone",
                          "proto": "any",
                          "name": "Helper rule #1",
                          "target": "helper"
                  },
                  {
                          ".description": "Helper rules require a set_helper option",
                          "proto": "any",
                          "name": "Helper rule #2",
                          "src": "lan",
                          "target": "helper"
                  },
  
                  {
                          ".description": "Notrack rules require an explicit source zone",
                          "proto": "any",
                          "name": "Notrack rule",
                          "target": "notrack"
                  },
  
                  {
                          ".description": "DSCP target rules require a set_dscp option",
                          "proto": "any",
                          "name": "DSCP target rule #1",
                          "target": "dscp"
                  },
  
                  {
                          ".description": "DSCP matches enforce AF specific rules due to required ip/ip6 prefix",
                          "proto": "any",
                          "name": "DSCP match rule #1",
                          "dscp": "0x0"
                  },
  
                  {
                          ".description": "Mark rules require a set_xmark or set_mark option",
                          "proto": "any",
                          "name": "Mark rule #1",
                          "target": "mark"
                  },
          ]
  }
  -- End --
  
  -- Expect stderr --
  [!] Section @rule[0] (Helper rule #1) must specify a source zone for target 'helper'
  [!] Section @rule[1] (Helper rule #2) must specify option 'set_helper' for target 'helper'
  [!] Section @rule[2] (Notrack rule) must specify a source zone for target 'notrack'
  [!] Section @rule[3] (DSCP target rule #1) must specify option 'set_dscp' for target 'dscp'
  [!] Section @rule[5] (Mark rule #1) must specify option 'set_mark' or 'set_xmark' for target 'mark'
  -- End --
  
  -- Expect stdout --
  table inet fw4
  flush table inet fw4
  
  table inet fw4 {
          #
          # Defines
          #
  
          define lan_devices = {  }
          define lan_subnets = {  }
  
  
          #
          # User includes
          #
  
          include "/etc/nftables.d/*.nft"
  
 
         #
         # Filter rules
         #
 
         chain input {
                 type filter hook input priority filter; policy drop;
 
                 iif "lo" accept comment "!fw4: Accept traffic from loopback"
 
                 ct state vmap { established : accept, related : accept } comment "!fw4: Handle inbound flows"
         }
 
         chain forward {
                 type filter hook forward priority filter; policy drop;
 
                 ct state vmap { established : accept, related : accept } comment "!fw4: Handle forwarded flows"
         }
 
         chain output {
                 type filter hook output priority filter; policy drop;
 
                 oif "lo" accept comment "!fw4: Accept traffic towards loopback"
 
                 ct state vmap { established : accept, related : accept } comment "!fw4: Handle outbound flows"
                 meta nfproto ipv4 ip dscp 0x0 counter comment "!fw4: DSCP match rule #1"
                 meta nfproto ipv6 ip6 dscp 0x0 counter comment "!fw4: DSCP match rule #1"
         }
 
         chain prerouting {
                 type filter hook prerouting priority filter; policy accept;
         }
 
         chain handle_reject {
                 meta l4proto tcp reject with tcp reset comment "!fw4: Reject TCP traffic"
                 reject with icmpx type port-unreachable comment "!fw4: Reject any other traffic"
         }
 
         chain input_lan {
                 jump drop_from_lan
         }
 
         chain output_lan {
                 jump drop_to_lan
         }
 
         chain forward_lan {
                 jump drop_to_lan
         }
 
         chain helper_lan {
         }
 
         chain drop_from_lan {
         }
 
         chain drop_to_lan {
         }
 
 
         #
         # NAT rules
         #
 
         chain dstnat {
                 type nat hook prerouting priority dstnat; policy accept;
         }
 
         chain srcnat {
                 type nat hook postrouting priority srcnat; policy accept;
         }
 
 
         #
         # Raw rules (notrack)
         #
 
         chain raw_prerouting {
                 type filter hook prerouting priority raw; policy accept;
         }
 
         chain raw_output {
                 type filter hook output priority raw; policy accept;
         }
 
 
         #
         # Mangle rules
         #
 
         chain mangle_prerouting {
                 type filter hook prerouting priority mangle; policy accept;
         }
 
         chain mangle_postrouting {
                 type filter hook postrouting priority mangle; policy accept;
         }
 
         chain mangle_input {
                 type filter hook input priority mangle; policy accept;
         }
 
         chain mangle_output {
                 type route hook output priority mangle; policy accept;
         }
 
         chain mangle_forward {
                 type filter hook forward priority mangle; policy accept;
         }
 }
 -- End --

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