90 lines
1.8 KiB
Go
90 lines
1.8 KiB
Go
package dnsforward
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import (
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"net"
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"sort"
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"strings"
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"github.com/AdguardTeam/golibs/utils"
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)
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// ipFromAddr gets IP address from addr.
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func ipFromAddr(addr net.Addr) (ip net.IP) {
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switch addr := addr.(type) {
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case *net.UDPAddr:
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return addr.IP
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case *net.TCPAddr:
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return addr.IP
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}
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return nil
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}
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// IPStringFromAddr extracts IP address from net.Addr.
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// Note: we can't use net.SplitHostPort(a.String()) because of IPv6 zone:
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// https://github.com/AdguardTeam/AdGuardHome/internal/issues/1261
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func IPStringFromAddr(addr net.Addr) (ipstr string) {
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if ip := ipFromAddr(addr); ip != nil {
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return ip.String()
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}
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return ""
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}
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func stringArrayDup(a []string) []string {
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a2 := make([]string, len(a))
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copy(a2, a)
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return a2
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}
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// Find value in a sorted array
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func findSorted(ar []string, val string) int {
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i := sort.SearchStrings(ar, val)
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if i == len(ar) || ar[i] != val {
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return -1
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}
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return i
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}
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func isWildcard(host string) bool {
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return len(host) >= 2 &&
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host[0] == '*' && host[1] == '.'
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}
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// Return TRUE if host name matches a wildcard pattern
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func matchDomainWildcard(host, wildcard string) bool {
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return isWildcard(wildcard) &&
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strings.HasSuffix(host, wildcard[1:])
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}
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// Return TRUE if client's SNI value matches DNS names from certificate
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func matchDNSName(dnsNames []string, sni string) bool {
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if utils.IsValidHostname(sni) != nil {
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return false
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}
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if findSorted(dnsNames, sni) != -1 {
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return true
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}
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for _, dn := range dnsNames {
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if matchDomainWildcard(sni, dn) {
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return true
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}
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}
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return false
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}
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// Is not comment
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func isUpstream(line string) bool {
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return !strings.HasPrefix(line, "#")
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}
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func filterOutComments(lines []string) []string {
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var filtered []string
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for _, l := range lines {
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if isUpstream(l) {
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filtered = append(filtered, l)
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}
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}
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return filtered
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}
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