1 files changed, 198 insertions, 0 deletions
diff --git a/src/replication/replicator/notify-connection.c b/src/replication/replicator/notify-connection.c
new file mode 100644
index 0000000..cfc2e20
--- /dev/null
+++ b/src/replication/replicator/notify-connection.c
@@ -0,0 +1,198 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "llist.h"
+#include "istream.h"
+#include "ostream.h"
+#include "strescape.h"
+#include "master-service.h"
+#include "replicator-queue.h"
+#include "notify-connection.h"
+
+#include <unistd.h>
+
+#define MAX_INBUF_SIZE (1024*64)
+#define NOTIFY_CLIENT_PROTOCOL_MAJOR_VERSION 1
+#define NOTIFY_CLIENT_PROTOCOL_MINOR_VERSION 0
+
+struct notify_connection {
+	struct notify_connection *prev, *next;
+	int refcount;
+
+	int fd;
+	struct io *io;
+	struct istream *input;
+	struct ostream *output;
+
+	struct replicator_queue *queue;
+
+	bool version_received:1;
+	bool destroyed:1;
+};
+
+struct notify_sync_request {
+	struct notify_connection *conn;
+	unsigned int id;
+};
+
+static struct notify_connection *connections;
+
+static void notify_connection_destroy(struct notify_connection *conn);
+
+static void notify_sync_callback(bool success, void *context)
+{
+	struct notify_sync_request *request = context;
+
+	o_stream_nsend_str(request->conn->output, t_strdup_printf(
+		"%c\t%u\n", success ? '+' : '-', request->id));
+
+	notify_connection_unref(&request->conn);
+	i_free(request);
+}
+
+static int
+notify_connection_input_line(struct notify_connection *conn, const char *line)
+{
+	struct notify_sync_request *request;
+	const char *const *args;
+	enum replication_priority priority;
+	unsigned int id;
+
+	/* U \t <username> \t <priority> [\t <sync id>] */
+	args = t_strsplit_tabescaped(line);
+	if (str_array_length(args) < 2) {
+		i_error("notify client sent invalid input: %s", line);
+		return -1;
+	}
+	if (strcmp(args[0], "U") != 0) {
+		i_error("notify client sent unknown command: %s", args[0]);
+		return -1;
+	}
+	if (replication_priority_parse(args[2], &priority) < 0) {
+		i_error("notify client sent invalid priority: %s", args[2]);
+		return -1;
+	}
+	if (priority != REPLICATION_PRIORITY_SYNC)
+		(void)replicator_queue_add(conn->queue, args[1], priority);
+	else if (args[3] == NULL || str_to_uint(args[3], &id) < 0) {
+		i_error("notify client sent invalid sync id: %s", line);
+		return -1;
+	} else {
+		request = i_new(struct notify_sync_request, 1);
+		request->conn = conn;
+		request->id = id;
+		notify_connection_ref(conn);
+		replicator_queue_add_sync(conn->queue, args[1],
+					  notify_sync_callback, request);
+	}
+	return 0;
+}
+
+static void notify_connection_input(struct notify_connection *conn)
+{
+	const char *line;
+	int ret;
+
+	switch (i_stream_read(conn->input)) {
+	case -2:
+		i_error("BUG: Client connection sent too much data");
+		notify_connection_destroy(conn);
+		return;
+	case -1:
+		notify_connection_destroy(conn);
+		return;
+	}
+
+	if (!conn->version_received) {
+		if ((line = i_stream_next_line(conn->input)) == NULL)
+			return;
+
+		if (!version_string_verify(line, "replicator-notify",
+				NOTIFY_CLIENT_PROTOCOL_MAJOR_VERSION)) {
+			i_error("Notify client not compatible with this server "
+				"(mixed old and new binaries?)");
+			notify_connection_destroy(conn);
+			return;
+		}
+		conn->version_received = TRUE;
+	}
+
+	while ((line = i_stream_next_line(conn->input)) != NULL) {
+		T_BEGIN {
+			ret = notify_connection_input_line(conn, line);
+		} T_END;
+		if (ret < 0) {
+			notify_connection_destroy(conn);
+			break;
+		}
+	}
+}
+
+struct notify_connection *
+notify_connection_create(int fd, struct replicator_queue *queue)
+{
+	struct notify_connection *conn;
+
+	i_assert(fd >= 0);
+
+	conn = i_new(struct notify_connection, 1);
+	conn->refcount = 1;
+	conn->queue = queue;
+	conn->fd = fd;
+	conn->input = i_stream_create_fd(fd, MAX_INBUF_SIZE);
+	conn->output = o_stream_create_fd(fd, SIZE_MAX);
+	o_stream_set_no_error_handling(conn->output, TRUE);
+	conn->io = io_add(fd, IO_READ, notify_connection_input, conn);
+	conn->queue = queue;
+
+	DLLIST_PREPEND(&connections, conn);
+	return conn;
+}
+
+static void notify_connection_destroy(struct notify_connection *conn)
+{
+	if (conn->destroyed)
+		return;
+	conn->destroyed = TRUE;
+
+	DLLIST_REMOVE(&connections, conn);
+
+	io_remove(&conn->io);
+	i_stream_close(conn->input);
+	o_stream_close(conn->output);
+	if (close(conn->fd) < 0)
+		i_error("close(notify connection) failed: %m");
+	conn->fd = -1;
+
+	notify_connection_unref(&conn);
+	master_service_client_connection_destroyed(master_service);
+}
+
+void notify_connection_ref(struct notify_connection *conn)
+{
+	i_assert(conn->refcount > 0);
+
+	conn->refcount++;
+}
+
+void notify_connection_unref(struct notify_connection **_conn)
+{
+	struct notify_connection *conn = *_conn;
+
+	i_assert(conn->refcount > 0);
+
+	*_conn = NULL;
+	if (--conn->refcount > 0)
+		return;
+
+	notify_connection_destroy(conn);
+	i_stream_unref(&conn->input);
+	o_stream_unref(&conn->output);
+	i_free(conn);
+}
+
+void notify_connections_destroy_all(void)
+{
+	while (connections != NULL)
+		notify_connection_destroy(connections);
+}