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-rw-r--r--logread.c199
1 files changed, 199 insertions, 0 deletions
diff --git a/logread.c b/logread.c
new file mode 100644
index 0000000..b7f9ebe
--- /dev/null
+++ b/logread.c
@@ -0,0 +1,199 @@
+/*
+ * 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 <time.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#include <libubox/blobmsg_json.h>
+#include <libubox/uloop.h>
+#include "libubus.h"
+
+enum {
+ LOG_MSG,
+ LOG_ID,
+ LOG_PRIO,
+ LOG_SOURCE,
+ LOG_TIME,
+ __LOG_MAX
+};
+
+static const struct blobmsg_policy log_policy[] = {
+ [LOG_MSG] = { .name = "msg", .type = BLOBMSG_TYPE_STRING },
+ [LOG_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 },
+ [LOG_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
+ [LOG_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_INT32 },
+ [LOG_TIME] = { .name = "time", .type = BLOBMSG_TYPE_INT64 },
+};
+
+enum {
+ WATCH_ID,
+ WATCH_COUNTER,
+ __WATCH_MAX
+};
+
+static struct ubus_subscriber log_event;
+
+static void log_handle_remove(struct ubus_context *ctx, struct ubus_subscriber *s,
+ uint32_t id)
+{
+ fprintf(stderr, "Object %08x went away\n", id);
+}
+
+static int log_notify(struct ubus_context *ctx, struct ubus_object *obj,
+ struct ubus_request_data *req, const char *method,
+ struct blob_attr *msg)
+{
+ struct blob_attr *tb[__LOG_MAX];
+ char *str;
+ time_t t;
+ char *c;
+
+ blobmsg_parse(log_policy, ARRAY_SIZE(log_policy), tb, blob_data(msg), blob_len(msg));
+ if (!tb[LOG_ID] || !tb[LOG_PRIO] || !tb[LOG_SOURCE] || !tb[LOG_TIME])
+ return 1;
+
+ t = blobmsg_get_u64(tb[LOG_TIME]) / 1000;
+ c = ctime(&t);
+ c[strlen(c) - 1] = '\0';
+ str = blobmsg_format_json(msg, true);
+ printf("%s - %s: %s\n",
+ c, (blobmsg_get_u32(tb[LOG_SOURCE])) ? ("syslog") : ("kernel"), method);
+ free(str);
+
+ return 0;
+}
+
+static void follow_log(struct ubus_context *ctx, int id)
+{
+ int ret;
+
+ uloop_init();
+ ubus_add_uloop(ctx);
+
+ log_event.remove_cb = log_handle_remove;
+ log_event.cb = log_notify;
+ ret = ubus_register_subscriber(ctx, &log_event);
+ if (ret)
+ fprintf(stderr, "Failed to add watch handler: %s\n", ubus_strerror(ret));
+
+ ret = ubus_subscribe(ctx, &log_event, id);
+ if (ret)
+ fprintf(stderr, "Failed to add watch handler: %s\n", ubus_strerror(ret));
+
+ uloop_run();
+ ubus_free(ctx);
+ uloop_done();
+}
+
+enum {
+ READ_LINE,
+ __READ_MAX
+};
+
+static const struct blobmsg_policy read_policy[] = {
+ [READ_LINE] = { .name = "lines", .type = BLOBMSG_TYPE_ARRAY },
+};
+
+static void read_cb(struct ubus_request *req, int type, struct blob_attr *msg)
+{
+ struct blob_attr *cur;
+ struct blob_attr *_tb[__READ_MAX];
+ time_t t;
+ int rem;
+
+ if (!msg)
+ return;
+
+ blobmsg_parse(read_policy, ARRAY_SIZE(read_policy), _tb, blob_data(msg), blob_len(msg));
+ if (!_tb[READ_LINE])
+ return;
+ blobmsg_for_each_attr(cur, _tb[READ_LINE], rem) {
+ struct blob_attr *tb[__LOG_MAX];
+ char *c;
+
+ if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE)
+ continue;
+
+ blobmsg_parse(log_policy, ARRAY_SIZE(log_policy), tb, blobmsg_data(cur), blobmsg_data_len(cur));
+ if (!tb[LOG_MSG] || !tb[LOG_ID] || !tb[LOG_PRIO] || !tb[LOG_SOURCE] || !tb[LOG_TIME])
+ continue;
+
+ t = blobmsg_get_u64(tb[LOG_TIME]) / 1000;
+ c = ctime(&t);
+ c[strlen(c) - 1] = '\0';
+ printf("%s - %s: %s\n",
+ c, (blobmsg_get_u32(tb[LOG_SOURCE])) ? ("syslog") : ("kernel"),
+ blobmsg_get_string(tb[LOG_MSG]));
+ }
+}
+
+static int usage(const char *prog)
+{
+ fprintf(stderr, "Usage: %s [options]\n"
+ "Options:\n"
+ " -s <path> Path to ubus socket\n"
+ " -l <count> Got only the last 'count' messages\n"
+ " -f Follow log messages\n"
+ "\n", prog);
+ return 1;
+}
+
+int main(int argc, char **argv)
+{
+ struct ubus_context *ctx;
+ uint32_t id;
+ const char *ubus_socket = NULL;
+ int ch, ret, subscribe = 0, lines = 0;
+ static struct blob_buf b;
+
+ while ((ch = getopt(argc, argv, "fs:l:")) != -1) {
+ switch (ch) {
+ case 's':
+ ubus_socket = optarg;
+ break;
+ case 'f':
+ subscribe = 1;
+ break;
+ case 'l':
+ lines = atoi(optarg);
+ break;
+ default:
+ usage(*argv);
+ break;
+ }
+ }
+
+ ctx = ubus_connect(ubus_socket);
+ if (!ctx) {
+ fprintf(stderr, "Failed to connect to ubus\n");
+ return -1;
+ }
+
+ ret = ubus_lookup_id(ctx, "log", &id);
+ if (ret)
+ fprintf(stderr, "Failed to find log object: %s\n", ubus_strerror(ret));
+
+ if (!subscribe || lines) {
+ blob_buf_init(&b, 0);
+ if (lines)
+ blobmsg_add_u32(&b, "lines", lines);
+ ubus_invoke(ctx, id, "read", b.head, read_cb, 0, 3000);
+ }
+
+ if (subscribe)
+ follow_log(ctx, id);
+
+ return 0;
+}