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add TransportDirect transport

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The `TransportDirect` transport allows to tweak outgoing SMTP
connections to remote servers. Currently, it only allows to select
network IP family (ipv4, ipv6 or both).

For example, to disable ipv6 for all outgoing SMTP connections:
- add these lines in mox.conf to create a new transport named
"disableipv6":
```
Transports:
  disableipv6:
    Direct:
      DisableIpv6: true
```
- then add these lines in domains.conf to use this transport:
```
Routes:
  -
    Transport: disableipv6
```

fix #149
This commit is contained in:
Laurent Meunier
2024-04-08 21:50:30 +02:00
parent d74610c345
commit be570d1c7d
14 changed files with 124 additions and 36 deletions
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8
smtpclient/gather.go
View File

@ -170,7 +170,7 @@ func GatherDestinations(ctx context.Context, elog *slog.Logger, resolver dns.Res
// GatherIPs looks up the IPs to try for connecting to host, with the IPs ordered
// to take previous attempts into account. For use with DANE, the CNAME-expanded
// name is returned, and whether the DNS responses were authentic.
func GatherIPs(ctx context.Context, elog *slog.Logger, resolver dns.Resolver, host dns.IPDomain, dialedIPs map[string][]net.IP) (authentic bool, expandedAuthentic bool, expandedHost dns.Domain, ips []net.IP, dualstack bool, rerr error) {
func GatherIPs(ctx context.Context, elog *slog.Logger, resolver dns.Resolver, network string, host dns.IPDomain, dialedIPs map[string][]net.IP) (authentic bool, expandedAuthentic bool, expandedHost dns.Domain, ips []net.IP, dualstack bool, rerr error) {
log := mlog.New("smtpclient", elog)
if len(host.IP) > 0 {
@ -216,7 +216,7 @@ func GatherIPs(ctx context.Context, elog *slog.Logger, resolver dns.Resolver, ho
}
}
ipaddrs, result, err := resolver.LookupIPAddr(ctx, name)
ipaddrs, result, err := resolver.LookupIP(ctx, network, name)
authentic = authentic && result.Authentic
expandedAuthentic = expandedAuthentic && result.Authentic
if err != nil || len(ipaddrs) == 0 {
@ -224,8 +224,8 @@ func GatherIPs(ctx context.Context, elog *slog.Logger, resolver dns.Resolver, ho
}
var have4, have6 bool
for _, ipaddr := range ipaddrs {
ips = append(ips, ipaddr.IP)
if ipaddr.IP.To4() == nil {
ips = append(ips, ipaddr)
if ipaddr.To4() == nil {
have6 = true
} else {
have4 = true