add syslog and klog support

1 files changed, 139 insertions, 0 deletions

diff --git a/log.c b/log.c
new file mode 100644
index 0000000..d2a7158
--- /dev/null
+++ b/log.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <libubox/uloop.h>
+#include <libubox/blobmsg_json.h>
+
+#include "procd.h"
+#include "syslog.h"
+
+static struct ubus_subscriber log_event;
+
+static int notify;
+struct ubus_context *_ctx;
+static struct blob_buf b;
+
+static const struct blobmsg_policy read_policy =
+	{ .name = "lines", .type = BLOBMSG_TYPE_INT32 };
+
+static const struct blobmsg_policy write_policy =
+	{ .name = "event", .type = BLOBMSG_TYPE_STRING };
+
+static int read_log(struct ubus_context *ctx, struct ubus_object *obj,
+		struct ubus_request_data *req, const char *method,
+		struct blob_attr *msg)
+{
+	struct blob_attr *tb;
+	struct log_head *l;
+	void *lines, *entry;
+	int count = 0;
+
+	if (msg) {
+		blobmsg_parse(&read_policy, 1, &tb, blob_data(msg), blob_len(msg));
+		if (tb)
+			count = blobmsg_get_u32(tb);
+	}
+
+	blob_buf_init(&b, 0);
+	lines = blobmsg_open_array(&b, "lines");
+
+	l = log_list(count, NULL);
+
+	while (l) {
+		entry = blobmsg_open_table(&b, NULL);
+		blobmsg_add_string(&b, "msg", l->data);
+		blobmsg_add_u32(&b, "id", l->id);
+		blobmsg_add_u32(&b, "priority", l->priority);
+		blobmsg_add_u32(&b, "source", l->source);
+		blobmsg_add_u64(&b, "time", (l->ts.tv_sec * 1000) + (l->ts.tv_nsec / 1000000));
+		blobmsg_close_table(&b, entry);
+		l = log_list(count, l);
+	}
+	blobmsg_close_table(&b, lines);
+	ubus_send_reply(ctx, req, b.head);
+
+	return 0;
+}
+
+static int write_log(struct ubus_context *ctx, struct ubus_object *obj,
+		struct ubus_request_data *req, const char *method,
+		struct blob_attr *msg)
+{
+	struct blob_attr *tb;
+	char *event;
+
+	if (msg) {
+		blobmsg_parse(&write_policy, 1, &tb, blob_data(msg), blob_len(msg));
+		if (tb) {
+			event = blobmsg_get_string(tb);
+			log_add(event, strlen(event) + 1, SOURCE_SYSLOG);
+		}
+	}
+
+	return 0;
+}
+
+static void log_subscribe_cb(struct ubus_context *ctx, struct ubus_object *obj)
+{
+	notify = obj->has_subscribers;
+}
+
+static const struct ubus_method log_methods[] = {
+	{ .name = "read", .handler = read_log, .policy = &read_policy, .n_policy = 1 },
+	{ .name = "write", .handler = write_log, .policy = &write_policy, .n_policy = 1 },
+};
+
+static struct ubus_object_type log_object_type =
+	UBUS_OBJECT_TYPE("log", log_methods);
+
+static struct ubus_object log_object = {
+	.name = "log",
+	.type = &log_object_type,
+	.methods = log_methods,
+	.n_methods = ARRAY_SIZE(log_methods),
+	.subscribe_cb = log_subscribe_cb,
+};
+
+void ubus_notify_log(struct log_head *l)
+{
+	int ret;
+
+	if (!notify)
+		return;
+
+	blob_buf_init(&b, 0);
+	blobmsg_add_u32(&b, "id", l->id);
+	blobmsg_add_u32(&b, "priority", l->priority);
+	blobmsg_add_u32(&b, "source", l->source);
+	blobmsg_add_u64(&b, "time", (l->ts.tv_sec * 1000) + (l->ts.tv_nsec / 1000000));
+
+	ret = ubus_notify(_ctx, &log_object, l->data, b.head, -1);
+	if (ret)
+		ERROR("Failed to notify log: %s\n", ubus_strerror(ret));
+}
+
+void ubus_init_log(struct ubus_context *ctx)
+{
+	int ret;
+
+	_ctx = ctx;
+
+	ret = ubus_add_object(ctx, &log_object);
+	if (ret)
+		ERROR("Failed to add object: %s\n", ubus_strerror(ret));
+
+	ret = ubus_register_subscriber(ctx, &log_event);
+	if (ret)
+		ERROR("Failed to add watch handler: %s\n", ubus_strerror(ret));
+}