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net.go
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net.go
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package lib
import (
"fmt"
"net"
"net/url"
)
// ResolveDomain takes a domain name and returns its IP addresses.
func ResolveDomain(domain string) ([]net.IP, error) {
ips, err := net.LookupIP(domain)
if err != nil {
return nil, err
}
if len(ips) == 0 {
return nil, fmt.Errorf("no IPs found for domain %s", domain)
}
return ips, nil
}
// GetIPFromURL takes a URL string, parses it to extract the host,
// and then resolves the host to IP addresses.
func GetIPFromURL(urlStr string) ([]net.IP, error) {
parsedURL, err := url.Parse(urlStr)
if err != nil {
return nil, err
}
host := parsedURL.Hostname()
parsedIP := net.ParseIP(host)
if parsedIP != nil {
return []net.IP{parsedIP}, nil
}
ips, err := ResolveDomain(host)
if err != nil {
return nil, err
}
return ips, nil
}