fix tls dialer when tls.enabled is false #3505
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We mistakenly believed that `libresolv`'s `search` function worked correctly in NetworkExtension, but it seems only `getaddrinfo` does. This commit changes the behavior of the `local` DNS server in NetworkExtension to prefer DHCP, falling back to `getaddrinfo` if DHCP servers are unavailable. It's worth noting that `prefer_go` does not disable DHCP since it respects Dial Fields, but `getaddrinfo` does the opposite. The new behavior only applies to NetworkExtension, not to all scenarios (primarily command-line binaries) as it did previously. In addition, this commit also improves the DHCP DNS server to use the same robust query logic as `local`.
We do not have the `com.apple.developer.networking.multicast` entitlement and are unable to obtain it for non-technical reasons.
…for local DNS server
`tls.NewDialer()` should return nil if `config` is nil. Because `tls.NewClientWithOptions()` always return nil` when `tls.Enabled == false`. fixed SagerNet#3419, SagerNet#3466 Signed-off-by: nunu6689 <[email protected]>
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tls.NewDialer()should return nil ifconfigis nil. Becausetls.NewClientWithOptions()always return nilwhentls.Enabled == false`.fixed #3419, #3466