feat: Support backend socket connections (UDS)

README.md

@@ -11,7 +11,7 @@ Proxy LDAP requests to different LDAP servers based on base DN. Based on code fr
 - [ ] Default fallback to `/etc/ldap-rp/config.toml`
 - [x] Unix Domain Socket support (incoming requests)
 - [ ] Unix Domain Socket garbage collection (incoming requests)
-- [ ] Unix Domain Socket support (outgoing requests)
+- [x] Unix Domain Socket support (outgoing requests)
 - [ ] **not planned:** TLS termination (incoming requests)
 - [ ] **not planned:** TLS backend connections (outgoing requests)
 - [ ] **not planned:** TLS SNI passthrough
@@ -30,6 +30,10 @@ listen = "[::]:3389"
 [[mapping]]
 from = "a.localhost"
 to = "example.com"
+# The LDAP address of the backend server:
+# - start with `./` or `/` for a socket URI
+# - start with anything else for a TCP connection
+# backend = "/run/lldap/example.com.sock"
 backend = "127.0.0.1:4389"
 [[mapping]]
 from = "b.localhost"