submission: relay backend: Turn client_proxy_create() into a proper b…

…ackend constructor.

src/submission/submission-backend-relay.c

@@ -745,16 +745,17 @@ backend_relay_cmd_quit(struct submission_backend *_backend,
  * Relay backend
  */
 
-void client_proxy_create(struct client *client,
-			 const struct submission_settings *set)
+struct submission_backend *
+submission_backend_relay_create(struct client *client,
+				const struct submission_settings *set)
 {
 	struct submission_backend_relay *backend;
 	struct mail_user *user = client->user;
 	struct ssl_iostream_settings ssl_set;
 	struct smtp_client_settings smtp_set;
 	enum smtp_client_connection_ssl_mode ssl_mode;
 
-	backend = &client->backend;
+	backend = i_new(struct submission_backend_relay, 1);
 	submission_backend_init(&backend->backend, client,
 				&backend_relay_vfuncs);
 
@@ -804,6 +805,8 @@ void client_proxy_create(struct client *client,
 	backend->conn = smtp_client_connection_create(
 		smtp_client, SMTP_PROTOCOL_SMTP, set->submission_relay_host,
 		set->submission_relay_port, ssl_mode, &smtp_set);
+
+	return &backend->backend;
 }
 
 static void backend_relay_destroy(struct submission_backend *_backend)
@@ -813,6 +816,7 @@ static void backend_relay_destroy(struct submission_backend *_backend)
 
 	if (backend->conn != NULL)
 		smtp_client_connection_close(&backend->conn);
+	i_free(backend);
 }
 
 static void backend_relay_ready_cb(const struct smtp_reply *reply,

src/submission/submission-backend-relay.h

@@ -15,7 +15,8 @@ struct submission_backend_relay {
 	bool xclient_sent:1;
 };
 
-void client_proxy_create(struct client *client,
-			 const struct submission_settings *set);
+struct submission_backend *
+submission_backend_relay_create(struct client *client,
+				const struct submission_settings *set);
 
 #endif

src/submission/submission-client.c

@@ -125,8 +125,8 @@ static void
 client_create_backend_default(struct client *client,
 			      const struct submission_settings *set)
 {
-	client_proxy_create(client, set);
-	client->backend_default = &client->backend.backend;
+	client->backend_default =
+		submission_backend_relay_create(client, set);
 }
 
 static void client_init_urlauth(struct client *client)

src/submission/submission-client.h

@@ -2,7 +2,6 @@
 #define CLIENT_H
 
 #include "net.h"
-#include "submission-backend-relay.h"
 
 struct smtp_reply;
 
@@ -38,7 +37,6 @@ struct client {
 	struct smtp_server_stats stats;
 
 	enum smtp_capability backend_capabilities;
-	struct submission_backend_relay backend;
 	struct submission_backend *backend_default;
 	struct submission_backend *backends;
 	unsigned int backends_count;