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 #include <unistd.h>
  17
  18 #include <linux/types.h>
  19
  20 #include <libubox/uloop.h>
  21 #include <libubox/blobmsg.h>
  22 #include <libubus.h>
  23
  24 #include "syslog.h"
  25
  26 int debug = 0;
  27 static int notify;
  28 static struct blob_buf b;
  29 static struct ubus_context *_ctx;
  30 static struct uloop_timeout ubus_timer;
  31
  32 static const struct blobmsg_policy read_policy =
  33         { .name = "lines", .type = BLOBMSG_TYPE_INT32 };
  34
  35 static const struct blobmsg_policy write_policy =
  36         { .name = "event", .type = BLOBMSG_TYPE_STRING };
  37
  38 static int
  39 read_log(struct ubus_context *ctx, struct ubus_object *obj,
  40                 struct ubus_request_data *req, const char *method,
  41                 struct blob_attr *msg)
  42 {
  43         struct blob_attr *tb;
  44         struct log_head *l;
  45         void *lines, *entry;
  46         int count = 0;
  47
  48         if (msg) {
  49                 blobmsg_parse(&read_policy, 1, &tb, blob_data(msg), blob_len(msg));
  50                 if (tb)
  51                         count = blobmsg_get_u32(tb);
  52         }
  53
  54         blob_buf_init(&b, 0);
  55         lines = blobmsg_open_array(&b, "lines");
  56
  57         l = log_list(count, NULL);
  58
  59         while (l) {
  60                 entry = blobmsg_open_table(&b, NULL);
  61                 blobmsg_add_string(&b, "msg", l->data);
  62                 blobmsg_add_u32(&b, "id", l->id);
  63                 blobmsg_add_u32(&b, "priority", l->priority);
  64                 blobmsg_add_u32(&b, "source", l->source);
  65                 blobmsg_add_u64(&b, "time", l->ts.tv_sec);
  66                 blobmsg_close_table(&b, entry);
  67                 l = log_list(count, l);
  68         }
  69         blobmsg_close_table(&b, lines);
  70         ubus_send_reply(ctx, req, b.head);
  71
  72         return 0;
  73 }
  74
  75 static int
  76 write_log(struct ubus_context *ctx, struct ubus_object *obj,
  77                 struct ubus_request_data *req, const char *method,
  78                 struct blob_attr *msg)
  79 {
  80         struct blob_attr *tb;
  81         char *event;
  82
  83         if (msg) {
  84                 blobmsg_parse(&write_policy, 1, &tb, blob_data(msg), blob_len(msg));
  85                 if (tb) {
  86                         event = blobmsg_get_string(tb);
  87                         log_add(event, strlen(event) + 1, SOURCE_SYSLOG);
  88                 }
  89         }
  90
  91         return 0;
  92 }
  93
  94 static void
  95 log_subscribe_cb(struct ubus_context *ctx, struct ubus_object *obj)
  96 {
  97         notify = obj->has_subscribers;
  98 }
  99
 100 static const struct ubus_method log_methods[] = {
 101         { .name = "read", .handler = read_log, .policy = &read_policy, .n_policy = 1 },
 102         { .name = "write", .handler = write_log, .policy = &write_policy, .n_policy = 1 },
 103 };
 104
 105 static struct ubus_object_type log_object_type =
 106         UBUS_OBJECT_TYPE("log", log_methods);
 107
 108 static struct ubus_object log_object = {
 109         .name = "log",
 110         .type = &log_object_type,
 111         .methods = log_methods,
 112         .n_methods = ARRAY_SIZE(log_methods),
 113         .subscribe_cb = log_subscribe_cb,
 114 };
 115
 116 void
 117 ubus_notify_log(struct log_head *l)
 118 {
 119         int ret;
 120
 121         if (!notify)
 122                 return;
 123
 124         blob_buf_init(&b, 0);
 125         blobmsg_add_u32(&b, "id", l->id);
 126         blobmsg_add_u32(&b, "priority", l->priority);
 127         blobmsg_add_u32(&b, "source", l->source);
 128         blobmsg_add_u64(&b, "time", (((__u64) l->ts.tv_sec) * 1000) + (l->ts.tv_nsec / 1000000));
 129
 130         ret = ubus_notify(_ctx, &log_object, l->data, b.head, -1);
 131         if (ret)
 132                 fprintf(stderr, "Failed to notify log: %s\n", ubus_strerror(ret));
 133 }
 134
 135 static void
 136 ubus_reconnect_cb(struct uloop_timeout *timeout)
 137 {
 138         if (!ubus_reconnect(_ctx, NULL))
 139                 ubus_add_uloop(_ctx);
 140         else
 141                 uloop_timeout_set(timeout, 1000);
 142 }
 143
 144 static void
 145 ubus_disconnect_cb(struct ubus_context *ctx)
 146 {
 147         ubus_timer.cb = ubus_reconnect_cb;
 148         uloop_timeout_set(&ubus_timer, 1000);
 149 }
 150
 151 static void
 152 ubus_connect_cb(struct uloop_timeout *timeout)
 153 {
 154         int ret;
 155
 156         _ctx = ubus_connect(NULL);
 157         if (!_ctx) {
 158                 uloop_timeout_set(timeout, 1000);
 159                 fprintf(stderr, "failed to connect to ubus\n");
 160                 return;
 161         }
 162         _ctx->connection_lost = ubus_disconnect_cb;
 163         ret = ubus_add_object(_ctx, &log_object);
 164         if (ret)
 165                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 166         fprintf(stderr, "log: connected to ubus\n");
 167         ubus_add_uloop(_ctx);
 168 }
 169
 170 int
 171 main(int argc, char **argv)
 172 {
 173         int ch, log_size = 0;
 174
 175         signal(SIGPIPE, SIG_IGN);
 176
 177         while ((ch = getopt(argc, argv, "S:")) != -1) {
 178                 switch (ch) {
 179                 case 'S':
 180                         log_size = atoi(optarg);
 181                         if (log_size < 1)
 182                                 log_size = 1;
 183                         log_size *= 1024;
 184                         break;
 185                 }
 186         }
 187         uloop_init();
 188         ubus_timer.cb = ubus_connect_cb;
 189         uloop_timeout_set(&ubus_timer, 1000);
 190         log_init(log_size);
 191         uloop_run();
 192         if (_ctx)
 193                 ubus_free(_ctx);
 194         log_shutdown();
 195         uloop_done();
 196
 197         return 0;
 198 }