Index: src/settings.cr
==================================================================
--- src/settings.cr
+++ src/settings.cr
@@ -1,47 +1,69 @@
 require "time"
 
 module AsyncDNS
   class Settings
     @local_domain : String?
+    @reload_period : Time::Span
     @last_reload : Time?
 
-    getter :static_hosts, :name_servers, :local_domain, :search_domains,
-      :timeout, :max_attempts, :abs_num_dots, :uses_tcp
-    setter :static_hosts, :name_servers, :local_domain, :search_domains,
-      :uses_tcp
+    property static_hosts, nameservers, local_domain, search_domains, uses_tcp
+    getter timeout, max_attempts, abs_num_dots
+
+    def timeout=(timeout)
+      raise ArgumentError.new("timeout must be positive") if timeout < 0
+
+      @timeout = timeout
+    end
+
+    def max_attempts=(max_attempts)
+      if max_attempts < 0
+        raise ArgumentError.new("max_attempts must be positive")
+      end
+
+      @max_attempts = max_attempts
+    end
+
+    def abs_num_dots=(abs_num_dots)
+      if abs_num_dots < 0
+        raise ArgumentError.new("abs_num_dots must be positive")
+      end
+
+      @abs_num_dots = abs_num_dots
+    end
 
     def initialize
       @static_hosts = Hash(String, Array(String)).new
-      @name_servers = [] of String
+      @nameservers = [] of String
       @search_domains = [] of String
       @timeout = Time::Span.new(seconds: 2)
-      @max_attempts = 2
+      @max_attempts = 3
       @abs_num_dots = 1
       @uses_tcp = false
+      @reload_period = Time::Span.new(seconds: 2)
 
       self.reload
     end
 
     def reload
       {% if flag?(:unix) %}
-      self.parse_hosts "/etc/hosts"
+        self.parse_hosts "/etc/hosts"
+        self.parse_resolv_conf "/etc/resolv.conf"
       {% else %}
       {% raise "Your OS is not supported by AsyncDNS" %}
       {% end %}
     end
 
     def parse_hosts(path)
-      file = File.open(path, "r")
-
       @static_hosts.clear
-      file.each_line do |line|
+
+      File.each_line(path, chomp: true) do |line|
         pos = line.index('#')
         line = line[0, pos] if pos
 
         split = line.split(/[ \t]/, remove_empty: true)
-        next unless split.size >= 2
+        next if split.size < 2
 
         address = split[0]
         split[1, split.size - 1].each do |host|
           addresses = @static_hosts[host]?
           if addresses.nil?
@@ -51,7 +73,49 @@
 
           addresses << address
         end
       end
     end
+
+    def parse_resolv_conf(path)
+      @nameservers.clear
+      @local_domain = nil
+      @search_domains.clear
+
+      File.each_line(path, chomp: true) do |line|
+        pos = line.index(/[#;]/)
+        line = line[0, pos] if pos
+
+        split = line.split(/[ \t]/, remove_empty: true)
+        next if split.size < 2
+
+        case split[0]
+        when "nameserver"
+          next if split.size != 2
+          @nameservers << split[1]
+        when "domain"
+          next if split.size != 2
+          @local_domain = split[1]
+        when "search"
+          @search_domains = split[1, split.size - 1]
+        when "options"
+          split[1, split.size - 1].each { |option| parse_resolv_option(option) }
+        end
+      end
+    end
+
+    private def parse_resolv_option(option)
+      if option.starts_with?("ndots:")
+        @abs_num_dots = option[6, option.size - 6].to_i
+      elsif option.starts_with?("timeout:")
+        @timeout = Time::Span.new(seconds: option[8, option.size - 8].to_i)
+      elsif option.starts_with?("attempts:")
+        @max_attempts = option[9, option.size - 9].to_i
+      elsif option.starts_with?("reload-period:")
+        @reload_period = Time::Span.new(
+          seconds: option[14, option.size - 14].to_i)
+      elsif option = "tcp"
+        @uses_tcp = true
+      end
+    end
   end
 end

Index: tests/example.cr
==================================================================
--- tests/example.cr
+++ tests/example.cr
@@ -3,5 +3,12 @@
 AsyncDNS::Query.new("crystal-lang.org", AsyncDNS::DNSClass::IN,
   AsyncDNS::RRType::A)
 
 settings = AsyncDNS::Settings.new
 p settings.static_hosts
+p settings.nameservers
+p settings.local_domain
+p settings.search_domains
+p settings.uses_tcp
+p settings.timeout
+p settings.max_attempts
+p settings.abs_num_dots