log.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/types.h>
  16
  17 #include <libubox/uloop.h>
  18 #include <libubox/blobmsg_json.h>
  19
  20 #include "procd.h"
  21 #include "syslog.h"
  22
  23 static int notify;
  24 struct ubus_context *_ctx;
  25 static struct blob_buf b;
  26
  27 static const struct blobmsg_policy read_policy =
  28         { .name = "lines", .type = BLOBMSG_TYPE_INT32 };
  29
  30 static const struct blobmsg_policy write_policy =
  31         { .name = "event", .type = BLOBMSG_TYPE_STRING };
  32
  33 static int read_log(struct ubus_context *ctx, struct ubus_object *obj,
  34                 struct ubus_request_data *req, const char *method,
  35                 struct blob_attr *msg)
  36 {
  37         struct blob_attr *tb;
  38         struct log_head *l;
  39         void *lines, *entry;
  40         int count = 0;
  41
  42         if (msg) {
  43                 blobmsg_parse(&read_policy, 1, &tb, blob_data(msg), blob_len(msg));
  44                 if (tb)
  45                         count = blobmsg_get_u32(tb);
  46         }
  47
  48         blob_buf_init(&b, 0);
  49         lines = blobmsg_open_array(&b, "lines");
  50
  51         l = log_list(count, NULL);
  52
  53         while (l) {
  54                 entry = blobmsg_open_table(&b, NULL);
  55                 blobmsg_add_string(&b, "msg", l->data);
  56                 blobmsg_add_u32(&b, "id", l->id);
  57                 blobmsg_add_u32(&b, "priority", l->priority);
  58                 blobmsg_add_u32(&b, "source", l->source);
  59                 blobmsg_add_u64(&b, "time", l->ts.tv_sec);
  60                 blobmsg_close_table(&b, entry);
  61                 l = log_list(count, l);
  62         }
  63         blobmsg_close_table(&b, lines);
  64         ubus_send_reply(ctx, req, b.head);
  65
  66         return 0;
  67 }
  68
  69 static int write_log(struct ubus_context *ctx, struct ubus_object *obj,
  70                 struct ubus_request_data *req, const char *method,
  71                 struct blob_attr *msg)
  72 {
  73         struct blob_attr *tb;
  74         char *event;
  75
  76         if (msg) {
  77                 blobmsg_parse(&write_policy, 1, &tb, blob_data(msg), blob_len(msg));
  78                 if (tb) {
  79                         event = blobmsg_get_string(tb);
  80                         log_add(event, strlen(event) + 1, SOURCE_SYSLOG);
  81                 }
  82         }
  83
  84         return 0;
  85 }
  86
  87 static void log_subscribe_cb(struct ubus_context *ctx, struct ubus_object *obj)
  88 {
  89         notify = obj->has_subscribers;
  90 }
  91
  92 static const struct ubus_method log_methods[] = {
  93         { .name = "read", .handler = read_log, .policy = &read_policy, .n_policy = 1 },
  94         { .name = "write", .handler = write_log, .policy = &write_policy, .n_policy = 1 },
  95 };
  96
  97 static struct ubus_object_type log_object_type =
  98         UBUS_OBJECT_TYPE("log", log_methods);
  99
 100 static struct ubus_object log_object = {
 101         .name = "log",
 102         .type = &log_object_type,
 103         .methods = log_methods,
 104         .n_methods = ARRAY_SIZE(log_methods),
 105         .subscribe_cb = log_subscribe_cb,
 106 };
 107
 108 void ubus_notify_log(struct log_head *l)
 109 {
 110         int ret;
 111
 112         if (!notify)
 113                 return;
 114
 115         blob_buf_init(&b, 0);
 116         blobmsg_add_u32(&b, "id", l->id);
 117         blobmsg_add_u32(&b, "priority", l->priority);
 118         blobmsg_add_u32(&b, "source", l->source);
 119         blobmsg_add_u64(&b, "time", (((__u64) l->ts.tv_sec) * 1000) + (l->ts.tv_nsec / 1000000));
 120
 121         ret = ubus_notify(_ctx, &log_object, l->data, b.head, -1);
 122         if (ret)
 123                 ERROR("Failed to notify log: %s\n", ubus_strerror(ret));
 124 }
 125
 126 void ubus_init_log(struct ubus_context *ctx)
 127 {
 128         int ret;
 129
 130         _ctx = ctx;
 131
 132         ret = ubus_add_object(ctx, &log_object);
 133         if (ret)
 134                 ERROR("Failed to add object: %s\n", ubus_strerror(ret));
 135 }