Retryable dns resolver
Based on miekg/dns and freely inspired by bogdanovich/dns_resolver.
Features
- Supports both system default DNS resolvers and user-provided ones
- Retries DNS requests in case of I/O errors, timeouts, or network failures
- Allows arbitrary query types
- Resolution with random resolvers
- Compatible with various DNS resolver protocols (TCP, UDP, DoH, and DoT)
Using go get
$ go get github.com/projectdiscovery/retryablednsAfter this command retryabledns library source will be in your $GOPATH
/etc/hosts file processing
By default, the library processes the /etc/hosts file up to a maximum amount of lines for efficiency (4096). If your setup has a larger hosts file and you want to process more lines, you can easily configure this limit by adjusting the hostsfile.MaxLines variable.
For example:
`` go
hostsfile.MaxLines = 10000 // Now the library will process up to 10000 lines from the hosts file
## Example
Usage Example: go package main
import ( "log"
"github.com/projectdiscovery/retryabledns" "github.com/miekg/dns" )
func main() { // It requires a list of resolvers. // Valid protocols are "udp", "tcp", "doh", "dot". Default are "udp". resolvers := []string{"8.8.8.8:53", "8.8.4.4:53", "tcp:1.1.1.1"} retries := 2 hostname := "hackerone.com"
dnsClient, err := retryabledns.New(resolvers, retries) if err != nil { log.Fatal(err) }
ips, err := dnsClient.Resolve(hostname) if err != nil { log.Fatal(err) }
log.Println(ips)
// Query Types: dns.TypeA, dns.TypeNS, dns.TypeCNAME, dns.TypeSOA, dns.TypePTR, dns.TypeMX, dns.TypeANY // dns.TypeTXT, dns.TypeAAAA, dns.TypeSRV (from github.com/miekg/dns) // retryabledns.ErrRetriesExceeded will be returned if a result isn't returned in max retries dnsResponses, err := dnsClient.Query(hostname, dns.TypeA) if err != nil { log.Fatal(err) }
log.Println(dnsResponses)
}
`
Credits:
- https://github.com/lixiangzhong/dnsutil
- https://github.com/rs/dnstrace`