log/logd.c

   1 /*
   2  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License version 2.1
   6  * as published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <stdio.h>
  15 #include <syslog.h>
  16
  17 #include <linux/types.h>
  18
  19 #include <libubox/uloop.h>
  20 #include <libubox/blobmsg.h>
  21 #include <libubus.h>
  22
  23 #include "syslog.h"
  24
  25 int debug = 0;
  26 static int notify;
  27 static struct blob_buf b;
  28 static struct ubus_auto_conn conn;
  29
  30 static const struct blobmsg_policy read_policy =
  31         { .name = "lines", .type = BLOBMSG_TYPE_INT32 };
  32
  33 static const struct blobmsg_policy write_policy =
  34         { .name = "event", .type = BLOBMSG_TYPE_STRING };
  35
  36 static int
  37 read_log(struct ubus_context *ctx, struct ubus_object *obj,
  38                 struct ubus_request_data *req, const char *method,
  39                 struct blob_attr *msg)
  40 {
  41         struct blob_attr *tb;
  42         struct log_head *l;
  43         void *lines, *entry;
  44         int count = 0;
  45
  46         if (msg) {
  47                 blobmsg_parse(&read_policy, 1, &tb, blob_data(msg), blob_len(msg));
  48                 if (tb)
  49                         count = blobmsg_get_u32(tb);
  50         }
  51
  52         blob_buf_init(&b, 0);
  53         lines = blobmsg_open_array(&b, "lines");
  54
  55         l = log_list(count, NULL);
  56
  57         while (l) {
  58                 entry = blobmsg_open_table(&b, NULL);
  59                 blobmsg_add_string(&b, "msg", l->data);
  60                 blobmsg_add_u32(&b, "id", l->id);
  61                 blobmsg_add_u32(&b, "priority", l->priority);
  62                 blobmsg_add_u32(&b, "source", l->source);
  63                 blobmsg_add_u64(&b, "time", l->ts.tv_sec);
  64                 blobmsg_close_table(&b, entry);
  65                 l = log_list(count, l);
  66         }
  67         blobmsg_close_table(&b, lines);
  68         ubus_send_reply(ctx, req, b.head);
  69
  70         return 0;
  71 }
  72
  73 static int
  74 write_log(struct ubus_context *ctx, struct ubus_object *obj,
  75                 struct ubus_request_data *req, const char *method,
  76                 struct blob_attr *msg)
  77 {
  78         struct blob_attr *tb;
  79         char *event;
  80
  81         if (msg) {
  82                 blobmsg_parse(&write_policy, 1, &tb, blob_data(msg), blob_len(msg));
  83                 if (tb) {
  84                         event = blobmsg_get_string(tb);
  85                         log_add(event, strlen(event) + 1, SOURCE_SYSLOG);
  86                 }
  87         }
  88
  89         return 0;
  90 }
  91
  92 static void
  93 log_subscribe_cb(struct ubus_context *ctx, struct ubus_object *obj)
  94 {
  95         notify = obj->has_subscribers;
  96 }
  97
  98 static const struct ubus_method log_methods[] = {
  99         { .name = "read", .handler = read_log, .policy = &read_policy, .n_policy = 1 },
 100         { .name = "write", .handler = write_log, .policy = &write_policy, .n_policy = 1 },
 101 };
 102
 103 static struct ubus_object_type log_object_type =
 104         UBUS_OBJECT_TYPE("log", log_methods);
 105
 106 static struct ubus_object log_object = {
 107         .name = "log",
 108         .type = &log_object_type,
 109         .methods = log_methods,
 110         .n_methods = ARRAY_SIZE(log_methods),
 111         .subscribe_cb = log_subscribe_cb,
 112 };
 113
 114 void
 115 ubus_notify_log(struct log_head *l)
 116 {
 117         int ret;
 118
 119         if (!notify)
 120                 return;
 121
 122         blob_buf_init(&b, 0);
 123         blobmsg_add_u32(&b, "id", l->id);
 124         blobmsg_add_u32(&b, "priority", l->priority);
 125         blobmsg_add_u32(&b, "source", l->source);
 126         blobmsg_add_u64(&b, "time", (((__u64) l->ts.tv_sec) * 1000) + (l->ts.tv_nsec / 1000000));
 127
 128         ret = ubus_notify(&conn.ctx, &log_object, l->data, b.head, -1);
 129         if (ret)
 130                 fprintf(stderr, "Failed to notify log: %s\n", ubus_strerror(ret));
 131 }
 132
 133 static void
 134 ubus_connect_handler(struct ubus_context *ctx)
 135 {
 136         int ret;
 137
 138         ret = ubus_add_object(ctx, &log_object);
 139         if (ret)
 140                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 141         fprintf(stderr, "log: connected to ubus\n");
 142 }
 143
 144 int
 145 main(int argc, char **argv)
 146 {
 147         signal(SIGPIPE, SIG_IGN);
 148
 149         uloop_init();
 150         log_init();
 151         conn.cb = ubus_connect_handler;
 152         ubus_auto_connect(&conn);
 153         uloop_run();
 154         log_shutdown();
 155         uloop_done();
 156
 157         return 0;
 158 }