mirror of
https://github.com/foxcpp/maddy.git
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61 lines
2.1 KiB
Go
61 lines
2.1 KiB
Go
/*
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Maddy Mail Server - Composable all-in-one email server.
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Copyright © 2019-2020 Max Mazurov <fox.cpp@disroot.org>, Maddy Mail Server contributors
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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// Package dns defines interfaces used by maddy modules to perform DNS
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// lookups.
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//
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// Currently, there is only Resolver interface which is implemented
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// by dns.DefaultResolver(). In the future, DNSSEC-enabled stub resolver
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// implementation will be added here.
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package dns
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import (
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"context"
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"net"
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"strings"
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)
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// Resolver is an interface that describes DNS-related methods used by maddy.
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//
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// It is implemented by dns.DefaultResolver(). Methods behave the same way.
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type Resolver interface {
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LookupAddr(ctx context.Context, addr string) (names []string, err error)
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LookupHost(ctx context.Context, host string) (addrs []string, err error)
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LookupMX(ctx context.Context, name string) ([]*net.MX, error)
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LookupTXT(ctx context.Context, name string) ([]string, error)
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LookupIPAddr(ctx context.Context, host string) ([]net.IPAddr, error)
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}
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// LookupAddr is a convenience wrapper for Resolver.LookupAddr.
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//
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// It returns the first name with trailing dot stripped.
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func LookupAddr(ctx context.Context, r Resolver, ip net.IP) (string, error) {
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names, err := r.LookupAddr(ctx, ip.String())
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if err != nil || len(names) == 0 {
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return "", err
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}
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return strings.TrimRight(names[0], "."), nil
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}
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func DefaultResolver() Resolver {
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if overrideServ != "" && overrideServ != "system-default" {
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override(overrideServ)
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}
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return net.DefaultResolver
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}
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