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 struct ubus_subscriber log_event;
  24
  25 static int notify;
  26 struct ubus_context *_ctx;
  27 static struct blob_buf b;
  28
  29 static const struct blobmsg_policy read_policy =
  30         { .name = "lines", .type = BLOBMSG_TYPE_INT32 };
  31
  32 static const struct blobmsg_policy write_policy =
  33         { .name = "event", .type = BLOBMSG_TYPE_STRING };
  34
  35 static int read_log(struct ubus_context *ctx, struct ubus_object *obj,
  36                 struct ubus_request_data *req, const char *method,
  37                 struct blob_attr *msg)
  38 {
  39         struct blob_attr *tb;
  40         struct log_head *l;
  41         void *lines, *entry;
  42         int count = 0;
  43
  44         if (msg) {
  45                 blobmsg_parse(&read_policy, 1, &tb, blob_data(msg), blob_len(msg));
  46                 if (tb)
  47                         count = blobmsg_get_u32(tb);
  48         }
  49
  50         blob_buf_init(&b, 0);
  51         lines = blobmsg_open_array(&b, "lines");
  52
  53         l = log_list(count, NULL);
  54
  55         while (l) {
  56                 entry = blobmsg_open_table(&b, NULL);
  57                 blobmsg_add_string(&b, "msg", l->data);
  58                 blobmsg_add_u32(&b, "id", l->id);
  59                 blobmsg_add_u32(&b, "priority", l->priority);
  60                 blobmsg_add_u32(&b, "source", l->source);
  61                 blobmsg_add_u64(&b, "time", l->ts.tv_sec);
  62                 blobmsg_close_table(&b, entry);
  63                 l = log_list(count, l);
  64         }
  65         blobmsg_close_table(&b, lines);
  66         ubus_send_reply(ctx, req, b.head);
  67
  68         return 0;
  69 }
  70
  71 static int write_log(struct ubus_context *ctx, struct ubus_object *obj,
  72                 struct ubus_request_data *req, const char *method,
  73                 struct blob_attr *msg)
  74 {
  75         struct blob_attr *tb;
  76         char *event;
  77
  78         if (msg) {
  79                 blobmsg_parse(&write_policy, 1, &tb, blob_data(msg), blob_len(msg));
  80                 if (tb) {
  81                         event = blobmsg_get_string(tb);
  82                         log_add(event, strlen(event) + 1, SOURCE_SYSLOG);
  83                 }
  84         }
  85
  86         return 0;
  87 }
  88
  89 static void log_subscribe_cb(struct ubus_context *ctx, struct ubus_object *obj)
  90 {
  91         notify = obj->has_subscribers;
  92 }
  93
  94 static const struct ubus_method log_methods[] = {
  95         { .name = "read", .handler = read_log, .policy = &read_policy, .n_policy = 1 },
  96         { .name = "write", .handler = write_log, .policy = &write_policy, .n_policy = 1 },
  97 };
  98
  99 static struct ubus_object_type log_object_type =
 100         UBUS_OBJECT_TYPE("log", log_methods);
 101
 102 static struct ubus_object log_object = {
 103         .name = "log",
 104         .type = &log_object_type,
 105         .methods = log_methods,
 106         .n_methods = ARRAY_SIZE(log_methods),
 107         .subscribe_cb = log_subscribe_cb,
 108 };
 109
 110 void ubus_notify_log(struct log_head *l)
 111 {
 112         int ret;
 113
 114         if (!notify)
 115                 return;
 116
 117         blob_buf_init(&b, 0);
 118         blobmsg_add_u32(&b, "id", l->id);
 119         blobmsg_add_u32(&b, "priority", l->priority);
 120         blobmsg_add_u32(&b, "source", l->source);
 121         blobmsg_add_u64(&b, "time", (((__u64) l->ts.tv_sec) * 1000) + (l->ts.tv_nsec / 1000000));
 122
 123         ret = ubus_notify(_ctx, &log_object, l->data, b.head, -1);
 124         if (ret)
 125                 ERROR("Failed to notify log: %s\n", ubus_strerror(ret));
 126 }
 127
 128 void ubus_init_log(struct ubus_context *ctx)
 129 {
 130         int ret;
 131
 132         _ctx = ctx;
 133
 134         ret = ubus_add_object(ctx, &log_object);
 135         if (ret)
 136                 ERROR("Failed to add object: %s\n", ubus_strerror(ret));
 137
 138         ret = ubus_register_subscriber(ctx, &log_event);
 139         if (ret)
 140                 ERROR("Failed to add watch handler: %s\n", ubus_strerror(ret));
 141 }