*-login: Add client_vfuncs.send_raw_data()

This allows login plugins to hook into seeing all the data that is sent to
the imap/pop3 client.

src/imap-login/imap-login-client.c

@@ -775,6 +775,7 @@ static struct client_vfuncs imap_client_vfuncs = {
 	imap_proxy_parse_line,
 	imap_proxy_error,
 	imap_proxy_get_state,
+	client_common_send_raw_data,
 };
 
 static const struct login_binary imap_login_binary = {

src/imap-urlauth/imap-urlauth-login.c

@@ -174,6 +174,7 @@ static struct client_vfuncs imap_urlauth_vfuncs = {
 	NULL,
 	NULL,
 	NULL,
+	client_common_send_raw_data,
 };
 
 static const struct login_binary imap_urlauth_login_binary = {

src/login-common/client-common.c

@@ -883,7 +883,8 @@ void client_notify_status(struct client *client, bool bad, const char *text)
 		client->v.notify_status(client, bad, text);
 }
 
-void client_send_raw_data(struct client *client, const void *data, size_t size)
+void client_common_send_raw_data(struct client *client,
+				 const void *data, size_t size)
 {
 	ssize_t ret;
 
@@ -897,6 +898,15 @@ void client_send_raw_data(struct client *client, const void *data, size_t size)
 	}
 }
 
+void client_send_raw_data(struct client *client, const void *data, size_t size)
+{
+	/* FIXME: NULL check is only for backwards compatibility - remove */
+	if (client->v.send_raw_data != NULL)
+		client->v.send_raw_data(client, data, size);
+	else
+		client_common_send_raw_data(client, data, size);
+}
+
 void client_send_raw(struct client *client, const char *data)
 {
 	client_send_raw_data(client, data, strlen(data));

src/login-common/client-common.h

@@ -120,6 +120,8 @@ struct client_vfuncs {
 	int (*proxy_parse_line)(struct client *client, const char *line);
 	void (*proxy_error)(struct client *client, const char *text);
 	const char *(*proxy_get_state)(struct client *client);
+	void (*send_raw_data)(struct client *client,
+			      const void *data, size_t size);
 };
 
 struct client {
@@ -268,6 +270,8 @@ void client_notify_disconnect(struct client *client,
 
 void client_send_raw_data(struct client *client, const void *data, size_t size);
 void client_send_raw(struct client *client, const char *data);
+void client_common_send_raw_data(struct client *client,
+				 const void *data, size_t size);
 
 void client_set_auth_waiting(struct client *client);
 void client_auth_send_challenge(struct client *client, const char *data);

src/pop3-login/client.c

@@ -323,6 +323,7 @@ static struct client_vfuncs pop3_client_vfuncs = {
 	pop3_proxy_parse_line,
 	pop3_proxy_error,
 	pop3_proxy_get_state,
+	client_common_send_raw_data,
 };
 
 static const struct login_binary pop3_login_binary = {