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main.go
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main.go
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package main
import (
"context"
"fmt"
"log"
"os"
"time"
"github.com/cordalace/waterflow/internal/resolver"
"github.com/cordalace/waterflow/internal/rublacklist"
"github.com/spf13/pflag"
)
type args struct {
numWorkers int
timeout time.Duration
bootstrapServers []string
upstreamServers []string
}
func parseArgs() *args {
numWorkers := pflag.Int("workers", resolver.DefaultNumWorkers(), "number of workers")
timeout := pflag.Float64("timeout", resolver.DefaultTimeout().Seconds(), "timeout for DNS requests (in seconds)")
bootstrapServers := pflag.StringArray("bootstrap", resolver.DefaultBootstrapServers(), "bootstrap DNS servers")
upstreamServers := pflag.StringArray("upstream", resolver.DefaultUpstreamServers(), "upstream DNS servers")
pflag.Parse()
return &args{
numWorkers: *numWorkers,
timeout: time.Duration(*timeout * 1e09),
bootstrapServers: *bootstrapServers,
upstreamServers: *upstreamServers,
}
}
func mainWithExitCode() int {
args := parseArgs()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
domains := make(chan string)
go func() {
if err := rublacklist.GetDomains(ctx, domains); err != nil {
log.Printf("error receiving domains: %v", err)
return
}
}()
resolveResults := make(chan resolver.Result)
r := resolver.NewResolver().WithOptions(
resolver.WithNumWorkers(args.numWorkers),
resolver.WithTimeout(args.timeout),
resolver.WithBootstrapServers(args.bootstrapServers),
resolver.WithUpstreamServers(args.upstreamServers),
)
if err := r.Init(); err != nil {
log.Printf("error initializing resolver: %v", err)
return 1
}
go r.Resolve(ctx, domains, resolveResults)
uniqueIPs := make(map[string]struct{})
for result := range resolveResults {
for _, ip := range result.IPs {
if ip.To4() != nil {
ipString := ip.String()
if _, ok := uniqueIPs[ipString]; !ok {
uniqueIPs[ipString] = struct{}{}
fmt.Println(ipString)
}
}
}
}
return 0
}
func main() {
os.Exit(mainWithExitCode())
}