From 6141a5694842f6ba9588eae5cc7cddb10830b9e6 Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Wed, 25 Nov 2015 14:43:40 +0000
Subject: [PATCH] Add method to send data to server pipe.

---
 src/libserver/rspamd_control.c | 106 ++++++++++++++++++++++++++++++++-
 src/libserver/rspamd_control.h |  15 ++++-
 2 files changed, 119 insertions(+), 2 deletions(-)

diff --git a/src/libserver/rspamd_control.c b/src/libserver/rspamd_control.c
index f16b095ff..685ffabf8 100644
--- a/src/libserver/rspamd_control.c
+++ b/src/libserver/rspamd_control.c
@@ -568,6 +568,8 @@ rspamd_srv_handler (gint fd, short what, gpointer ud)
 	}
 	else if (what == EV_WRITE) {
 		rdata = ud;
+		worker = rdata->worker;
+		srv = worker->srv;
 
 		memset (&msg, 0, sizeof (msg));
 
@@ -605,11 +607,113 @@ rspamd_srv_handler (gint fd, short what, gpointer ud)
 	}
 }
 
-void rspamd_main_start_watching (struct rspamd_worker *worker,
+void
+rspamd_srv_start_watching (struct rspamd_worker *worker,
 		struct event_base *ev_base)
 {
+	g_assert (worker != NULL);
+
 	event_set (&worker->srv_ev, worker->srv_pipe[0], EV_READ | EV_PERSIST,
 			rspamd_srv_handler, worker);
 	event_base_set (ev_base, &worker->srv_ev);
 	event_add (&worker->srv_ev, NULL);
 }
+
+struct rspamd_srv_request_data {
+	struct rspamd_worker *worker;
+	struct rspamd_srv_command cmd;
+	struct rspamd_srv_reply rep;
+	rspamd_srv_reply_handler handler;
+	struct event io_ev;
+	gpointer ud;
+};
+
+static void
+rspamd_srv_request_handler (gint fd, short what, gpointer ud)
+{
+	struct rspamd_srv_request_data *rd = ud;
+	struct msghdr msg;
+	struct iovec iov;
+	struct cmsghdr *cmsg;
+	guchar fdspace[CMSG_SPACE(sizeof (int))];
+	gssize r;
+	gint rfd = -1;
+
+	if (what == EV_WRITE) {
+		/* Send request to server */
+		r = write (fd, &rd->cmd, sizeof (rd->cmd));
+
+		if (r == -1) {
+			msg_err ("cannot write to server pipe: %s", strerror (errno));
+			goto cleanup;
+		}
+
+		event_del (&rd->io_ev);
+		event_set (&rd->io_ev, rd->worker->srv_pipe[1], EV_READ,
+				rspamd_srv_request_handler, rd);
+		event_add (&rd->io_ev, NULL);
+	}
+	else {
+		iov.iov_base = &rd->rep;
+		iov.iov_len = sizeof (rd->rep);
+		memset (&msg, 0, sizeof (msg));
+		msg.msg_control = fdspace;
+		msg.msg_controllen = sizeof (fdspace);
+		msg.msg_iov = &iov;
+		msg.msg_iovlen = 1;
+
+		r = recvmsg (fd, &msg, 0);
+
+		if (r == -1) {
+			msg_err ("cannot read from server pipe: %s", strerror (errno));
+			goto cleanup;
+		}
+
+		if (r < (gint)sizeof (rd->rep)) {
+			msg_err ("cannot read from server pipe, invalid length: %d",
+					(gint)r);
+			goto cleanup;
+		}
+
+		if (msg.msg_controllen >= CMSG_SPACE(sizeof (int))) {
+			cmsg = CMSG_FIRSTHDR (&msg);
+
+			rfd = *(int *) CMSG_DATA(CMSG_FIRSTHDR (&msg));
+		}
+
+		goto cleanup;
+	}
+
+	return;
+
+cleanup:
+	rd->handler (rd->worker, &rd->rep, rfd, rd->ud);
+	event_del (&rd->io_ev);
+	g_slice_free1 (sizeof (*rd), rd);
+}
+
+void
+rspamd_srv_send_command (struct rspamd_worker *worker,
+		struct event_base *ev_base,
+		struct rspamd_srv_command *cmd,
+		rspamd_srv_reply_handler handler, gpointer ud)
+{
+	struct rspamd_srv_request_data *rd;
+
+	g_assert (cmd != NULL);
+	g_assert (worker != NULL);
+	g_assert (handler != NULL);
+
+	rd = g_slice_alloc0 (sizeof (*rd));
+	memcpy (&rd->cmd, cmd, sizeof (rd->cmd));
+	rd->handler = handler;
+	rd->ud = ud;
+	rd->worker = worker;
+	rd->rep.id = cmd->id;
+	rd->rep.type = cmd->type;
+
+	event_set (&rd->io_ev, worker->srv_pipe[1], EV_WRITE,
+			rspamd_srv_request_handler, rd);
+	event_base_set (ev_base, &rd->io_ev);
+	event_add (&rd->io_ev, NULL);
+}
diff --git a/src/libserver/rspamd_control.h b/src/libserver/rspamd_control.h
index 24874e785..5e8497a0a 100644
--- a/src/libserver/rspamd_control.h
+++ b/src/libserver/rspamd_control.h
@@ -104,6 +104,10 @@ typedef gboolean (*rspamd_worker_control_handler) (struct rspamd_main *rspamd_ma
 		struct rspamd_control_command *cmd,
 		gpointer ud);
 
+typedef void (*rspamd_srv_reply_handler) (struct rspamd_worker *worker,
+		struct rspamd_srv_reply *rep, gint rep_fd,
+		gpointer ud);
+
 /**
  * Process client socket connection
  */
@@ -127,7 +131,16 @@ void rspamd_control_worker_add_cmd_handler (struct rspamd_worker *worker,
 /**
  * Start watching on srv pipe
  */
-void rspamd_main_start_watching (struct rspamd_worker *worker,
+void rspamd_srv_start_watching (struct rspamd_worker *worker,
 		struct event_base *ev_base);
 
+
+/**
+ * Send command to srv pipe and read reply calling the specified callback at the
+ * end
+ */
+void rspamd_srv_send_command (struct rspamd_worker *worker,
+		struct event_base *ev_base,
+		struct rspamd_srv_command *cmd,
+		rspamd_srv_reply_handler handler, gpointer ud);
 #endif
-- 
2.39.5