config.c

   1 /*
   2  * ustp - OpenWrt STP/RSTP/MSTP daemon
   3  * Copyright (C) 2021 Felix Fietkau <nbd@nbd.name>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   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 #include <string.h>
  15
  16 #include <libubox/avl-cmp.h>
  17 #include <libubox/utils.h>
  18
  19 #include "config.h"
  20
  21 AVL_TREE(bridge_config, avl_strcmp, false, NULL);
  22
  23 static uint32_t bridge_config_timestamp(void)
  24 {
  25         struct timespec ts;
  26
  27         clock_gettime(CLOCK_MONOTONIC, &ts);
  28
  29         return ts.tv_sec;
  30 }
  31
  32 struct bridge_config *
  33 bridge_config_get(const char *name, bool create)
  34 {
  35         struct bridge_config *cfg;
  36         char *name_buf;
  37
  38         cfg = avl_find_element(&bridge_config, name, cfg, node);
  39         if (cfg)
  40                 goto out;
  41
  42         if (!create)
  43                 return NULL;
  44
  45         cfg = calloc_a(sizeof(*cfg), &name_buf, strlen(name) + 1);
  46         cfg->node.key = strcpy(name_buf, name);
  47         avl_insert(&bridge_config, &cfg->node);
  48
  49 out:
  50         cfg->timestamp = bridge_config_timestamp();
  51
  52         return cfg;
  53 }
  54
  55 void bridge_config_expire(void)
  56 {
  57         struct bridge_config *cfg, *tmp;
  58         uint32_t ts;
  59
  60         ts = bridge_config_timestamp();
  61         avl_for_each_element_safe(&bridge_config, cfg, node, tmp) {
  62                 if (ts - cfg->timestamp < 60)
  63                         continue;
  64
  65                 avl_delete(&bridge_config, &cfg->node);
  66                 free(cfg);
  67         }
  68 }