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dnsblast.go
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dnsblast.go
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// MIT License
// Copyright (c) [2022] [Bohdan Ivashko (https://github.com/Arriven)]
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package job
import (
"context"
"errors"
"fmt"
"sync"
"time"
"go.uber.org/zap"
"github.com/Arriven/db1000n/src/core/dnsblast"
"github.com/Arriven/db1000n/src/job/config"
)
type dnsBlastConfig struct {
BasicJobConfig
RootDomain string
Protocol string // "udp", "tcp", "tcp-tls"
SeedDomains []string
ParallelQueries int
}
func dnsBlastJob(ctx context.Context, logger *zap.Logger, globalConfig *GlobalConfig, args config.Args) (data any, err error) {
jobConfig, err := getDNSBlastConfig(args, globalConfig)
if err != nil {
return nil, err
}
var wg sync.WaitGroup
err = dnsblast.Start(ctx, logger, &wg, &dnsblast.Config{
RootDomain: jobConfig.RootDomain,
Protocol: jobConfig.Protocol,
SeedDomains: jobConfig.SeedDomains,
ParallelQueries: jobConfig.ParallelQueries,
Delay: time.Duration(jobConfig.IntervalMs) * time.Millisecond,
ClientID: globalConfig.ClientID,
})
wg.Wait()
return nil, err
}
func getDNSBlastConfig(args config.Args, globalConfig *GlobalConfig) (*dnsBlastConfig, error) {
const (
defaultParallelQueriesPerCycle = 5
defaultIntervalMS = 10
)
var jobConfig dnsBlastConfig
if err := ParseConfig(&jobConfig, args, *globalConfig); err != nil {
return nil, fmt.Errorf("failed to parse DNS Blast job configurations: %w", err)
}
//
// Default settings and early misconfiguration prevention
//
switch {
case len(jobConfig.RootDomain) == 0:
return nil, errors.New("no root domain provided, consider adding it")
case len(jobConfig.SeedDomains) == 0:
return nil, errors.New("no seed domains provided, at least one is required")
}
switch jobConfig.Protocol {
case dnsblast.UDPProtoName, dnsblast.TCPProtoName, dnsblast.TCPTLSProtoName:
// All good
case "":
// Default to UDP
jobConfig.Protocol = dnsblast.UDPProtoName
default:
return nil, fmt.Errorf("unrecognized DNS protocol %q, expected one of [%q, %q, %q]", jobConfig.Protocol,
dnsblast.UDPProtoName, dnsblast.TCPProtoName, dnsblast.TCPTLSProtoName)
}
if jobConfig.ParallelQueries == 0 {
jobConfig.ParallelQueries = defaultParallelQueriesPerCycle
}
if jobConfig.IntervalMs == 0 {
jobConfig.IntervalMs = defaultIntervalMS
}
return &jobConfig, nil
}