Testing that `option log 1` enables rule logging and sets the rule name as
   log prefix. Also testing that setting settin `option log` to a non-boolean
   string uses that string verbatim as log prefix.
   
   -- 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": "wan"
                  }
          ],
          "rule": [
                  {
                          "proto": "any",
                          "log": "1"
                  },
                  {
                          "name": "Explicit rule name",
                          "proto": "any",
                          "log": "1"
                  },
                  {       "proto": "any",
                          "log": "Explicit prefix: "
                  }
          ],
          "redirect": [
                  {
                          "proto": "tcp",
                          "src": "wan",
                          "dest_ip": "10.0.0.2",
                          "dest_port": "22",
                          "log": "1"
                  },
                  {
                          "name": "Explicit redirect name",
                          "proto": "tcp",
                          "src": "wan",
                          "dest_ip": "10.0.0.3",
                          "dest_port": "23",
                          "log": "1"
                  },
                  {
                          "proto": "tcp",
                          "src": "wan",
                          "dest_ip": "10.0.0.4",
                          "dest_port": "24",
                          "log": "Explicit prefix: "
                  }
          ],
          "nat": [
                  {
                          "src": "wan",
                          "target": "MASQUERADE",
                          "log": "1"
                  },
                  {
                          "name": "Explicit nat name",
                          "src": "wan",
                          "target": "MASQUERADE",
                          "log": "1"
                  },
                  {
                          "src": "wan",
                          "target": "MASQUERADE",
                          "log": "Explicit log prefix: "
                  }
          ]
  }
  -- End --
  
  -- Expect stdout --
  table inet fw4
  flush table inet fw4
  
  table inet fw4 {
          #
          # Defines
          #
  
          define wan_devices = {  }
          define wan_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"
                 counter log prefix "@rule[0]: " comment "!fw4: @rule[0]"
                 counter log prefix "Explicit rule name: " comment "!fw4: Explicit rule name"
                 counter log prefix "Explicit prefix: " comment "!fw4: @rule[2]"
         }
 
         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_wan {
                 ct status dnat accept comment "!fw4: Accept port redirections"
                 jump drop_from_wan
         }
 
         chain output_wan {
                 jump drop_to_wan
         }
 
         chain forward_wan {
                 ct status dnat accept comment "!fw4: Accept port forwards"
                 jump drop_to_wan
         }
 
         chain helper_wan {
         }
 
         chain drop_from_wan {
         }
 
         chain drop_to_wan {
         }
 
 
         #
         # NAT rules
         #
 
         chain dstnat {
                 type nat hook prerouting priority dstnat; policy accept;
         }
 
         chain srcnat {
                 type nat hook postrouting priority srcnat; policy accept;
         }
 
         chain dstnat_wan {
                 meta nfproto ipv4 counter log prefix "@redirect[0]: " dnat 10.0.0.2:22 comment "!fw4: @redirect[0]"
                 meta nfproto ipv4 counter log prefix "Explicit redirect name: " dnat 10.0.0.3:23 comment "!fw4: Explicit redirect name"
                 meta nfproto ipv4 counter log prefix "Explicit prefix: " dnat 10.0.0.4:24 comment "!fw4: @redirect[2]"
         }
 
         chain srcnat_wan {
                 meta nfproto ipv4 counter log prefix "@nat[0]: " masquerade comment "!fw4: @nat[0]"
                 meta nfproto ipv4 counter log prefix "Explicit nat name: " masquerade comment "!fw4: Explicit nat name"
                 meta nfproto ipv4 counter log prefix "Explicit log prefix: " masquerade comment "!fw4: @nat[2]"
         }
 
 
         #
         # 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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