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setup_parse.go
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setup_parse.go
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/*
* Copyright 2018 - 2020 Christian Müller <[email protected]>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ads
import (
"fmt"
"net"
"net/url"
"time"
"github.com/coredns/caddy"
"github.com/coredns/coredns/plugin"
"golang.org/x/net/idna"
)
type adsPluginConfig struct {
BlacklistURLs []string
WhitelistURLs []string
BlacklistFiles []string
WhitelistFiles []string
BlacklistRules []string
WhitelistRules []string
RegexBlacklistRules []string
RegexWhitelistRules []string
TargetIP net.IP
TargetIPv6 net.IP
HttpListRenewalInterval time.Duration
FileListRenewalInterval time.Duration
ListRenewalRetryCount int
ListRenewalRetryInterval time.Duration
ListPersistencePath string
EnableLogging bool
EnableAutoUpdate bool
EnableListPersistence bool
WriteNXDomain bool
}
func parsePluginConfiguration(c *caddy.Controller) (*adsPluginConfig, error) {
config := defaultConfigWithoutRules
for c.NextBlock() {
value := c.Val()
switch value {
case "default-lists":
config.BlacklistURLs = append(config.BlacklistURLs, defaultBlacklists...)
case "strict-default-lists":
config.BlacklistURLs = append(config.BlacklistURLs, strictDefaultBlacklists...)
config.WhitelistURLs = append(config.WhitelistURLs, strictDefaultWhitelists...)
case "unfiltered-strict-default-lists":
config.BlacklistURLs = append(config.BlacklistURLs, strictDefaultBlacklists...)
case "blacklist":
if !c.NextArg() {
return nil, plugin.Error("ads", c.Err("No URL found after list token"))
}
parsedUrl, err := url.Parse(c.Val())
if err != nil {
return nil, plugin.Error("ads", c.Err(fmt.Sprintf("Invaild URL. Got error while parsing %s", err.Error())))
} else if parsedUrl.Scheme != "http" && parsedUrl.Scheme != "https" && parsedUrl.Scheme != "file" {
return nil, plugin.Error("ads", c.Err(fmt.Sprintf("Invaild URL. The scheme %s is not supported!", parsedUrl.Scheme)))
} else if parsedUrl.Scheme == "http" || parsedUrl.Scheme == "https" {
config.BlacklistURLs = append(config.BlacklistURLs, c.Val())
} else {
config.BlacklistFiles = append(config.BlacklistFiles, parsedUrl.Path)
}
case "whitelist":
if !c.NextArg() {
return nil, plugin.Error("ads", c.Err("No URL found after list token"))
}
parsedUrl, err := url.Parse(c.Val())
if err != nil {
return nil, plugin.Error("ads", c.Err(fmt.Sprintf("Invaild URL. Got error while parsing %s", err.Error())))
} else if parsedUrl.Scheme != "http" && parsedUrl.Scheme != "https" && parsedUrl.Scheme != "file" {
return nil, plugin.Error("ads", c.Err(fmt.Sprintf("Invaild URL. The scheme %s is not supported!", parsedUrl.Scheme)))
} else if parsedUrl.Scheme == "http" || parsedUrl.Scheme == "https" {
config.WhitelistURLs = append(config.WhitelistURLs, c.Val())
} else {
config.WhitelistFiles = append(config.WhitelistFiles, parsedUrl.Path)
}
case "target":
if !c.NextArg() {
return nil, plugin.Error("ads", c.Err("No target IP specified"))
}
ip := net.ParseIP(c.Val())
if ip == nil {
return nil, plugin.Error("ads", c.Err("Invalid target IP specified"))
}
config.TargetIP = ip
case "target-ipv6":
if !c.NextArg() {
return nil, plugin.Error("ads", c.Err("No target IP specified"))
}
ip := net.ParseIP(c.Val())
if ip == nil {
return nil, plugin.Error("ads", c.Err("Invalid target IP specified"))
}
config.TargetIPv6 = ip
case "disable-auto-update":
config.EnableAutoUpdate = false
break
case "auto-update-interval":
if !c.NextArg() {
return nil, plugin.Error("ads", c.Err("No update interval defined"))
}
i, err := time.ParseDuration(c.Val())
if err != nil {
return nil, plugin.Error("ads", err)
}
config.ListRenewalRetryInterval = i
break
//TODO Add Options for Failure Retry interval and Failure retry count
case "list-store":
if !c.NextArg() {
return nil, plugin.Error("ads", c.Err("No filepath for blocklist persistency defined"))
}
if config.EnableListPersistence {
return nil, plugin.Error("ads", c.Err("Only one filepath for blocklist persistency can be defined"))
}
path := c.Val()
//TODO implement check if path is valid
config.EnableListPersistence = true
config.ListPersistencePath = path
break
case "log":
config.EnableLogging = true
case "block":
if !c.NextArg() {
return nil, plugin.Error("ads", c.Err("No name for blacklist (block) entry defined"))
}
v := c.Val()
encoded, err := idna.ToASCII(v)
if err != nil {
return nil, plugin.Error("ads", c.Err(fmt.Sprintf("Could not decode IDN of qname %q", v)))
}
config.BlacklistRules = append(config.BlacklistRules, encoded)
break
case "block-regex":
if !c.NextArg() {
return nil, plugin.Error("ads", c.Err("No name for blacklist regex (block-regex) entry defined"))
}
config.RegexBlacklistRules = append(config.RegexBlacklistRules, c.Val())
break
case "permit":
if !c.NextArg() {
return nil, plugin.Error("ads", c.Err("No name for whitelist (permit) entry defined"))
}
v := c.Val()
encoded, err := idna.ToASCII(v)
if err != nil {
return nil, plugin.Error("ads", c.Err(fmt.Sprintf("Could not decode IDN of qname %q", v)))
}
config.WhitelistRules = append(config.WhitelistRules, encoded)
break
case "permit-regex":
if !c.NextArg() {
return nil, plugin.Error("ads", c.Err("No name for whitelist regex (permit-regex) entry defined"))
}
config.RegexWhitelistRules = append(config.RegexWhitelistRules, c.Val())
break
case "nxdomain":
config.WriteNXDomain = true
break
case "}":
break
case "{":
break
}
}
if len(config.BlacklistURLs) == 0 {
config.BlacklistURLs = defaultBlacklists
}
return &config, nil
}
func buildRulesetFromConfig(cfg *adsPluginConfig) (*ConfiguredRuleSet, error) {
ruleset := BuildRuleset(cfg.WhitelistRules, cfg.BlacklistRules)
for _, v := range cfg.RegexWhitelistRules {
if err := ruleset.AddRegexToWhitelist(v); err != nil {
return nil, err
}
}
for _, v := range cfg.RegexBlacklistRules {
if err := ruleset.AddRegexToBlacklist(v); err != nil {
return nil, err
}
}
return &ruleset, nil
}