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https://github.com/foxcpp/maddy.git
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48e21f566e
Allow to override DNS resolver address via the -debug.dnsoverride flag and SMTP port via -debug.smtpport. All flags are not available unless maddy is built using the 'debugflags' tag.
43 lines
1.3 KiB
Go
43 lines
1.3 KiB
Go
// 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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