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/*
* 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;
}
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