src/as.c

   1 /*
   2         libloc - A library to determine the location of someone on the Internet
   3
   4         Copyright (C) 2017 IPFire Development Team <info@ipfire.org>
   5
   6         This library is free software; you can redistribute it and/or
   7         modify it under the terms of the GNU Lesser General Public
   8         License as published by the Free Software Foundation; either
   9         version 2.1 of the License, or (at your option) any later version.
  10
  11         This library is distributed in the hope that it will be useful,
  12         but WITHOUT ANY WARRANTY; without even the implied warranty of
  13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14         Lesser General Public License for more details.
  15 */
  16
  17 #include <endian.h>
  18 #include <errno.h>
  19 #include <stdint.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22
  23 #include <loc/libloc.h>
  24 #include <loc/as.h>
  25 #include <loc/format.h>
  26 #include <loc/private.h>
  27 #include <loc/stringpool.h>
  28
  29 struct loc_as {
  30         struct loc_ctx* ctx;
  31         int refcount;
  32
  33         uint32_t number;
  34         char* name;
  35 };
  36
  37 LOC_EXPORT int loc_as_new(struct loc_ctx* ctx, struct loc_as** as, uint32_t number) {
  38         struct loc_as* a = calloc(1, sizeof(*a));
  39         if (!a)
  40                 return -ENOMEM;
  41
  42         a->ctx = loc_ref(ctx);
  43         a->refcount = 1;
  44
  45         a->number = number;
  46         a->name = NULL;
  47
  48         DEBUG(a->ctx, "AS%u allocated at %p\n", a->number, a);
  49         *as = a;
  50
  51         return 0;
  52 }
  53
  54 LOC_EXPORT struct loc_as* loc_as_ref(struct loc_as* as) {
  55         as->refcount++;
  56
  57         return as;
  58 }
  59
  60 static void loc_as_free(struct loc_as* as) {
  61         DEBUG(as->ctx, "Releasing AS%u %p\n", as->number, as);
  62
  63         if (as->name)
  64                 free(as->name);
  65
  66         loc_unref(as->ctx);
  67         free(as);
  68 }
  69
  70 LOC_EXPORT struct loc_as* loc_as_unref(struct loc_as* as) {
  71         if (--as->refcount > 0)
  72                 return NULL;
  73
  74         loc_as_free(as);
  75
  76         return NULL;
  77 }
  78
  79 LOC_EXPORT uint32_t loc_as_get_number(struct loc_as* as) {
  80         return as->number;
  81 }
  82
  83 LOC_EXPORT const char* loc_as_get_name(struct loc_as* as) {
  84         return as->name;
  85 }
  86
  87 LOC_EXPORT int loc_as_set_name(struct loc_as* as, const char* name) {
  88         as->name = strdup(name);
  89
  90         return 0;
  91 }
  92
  93 LOC_EXPORT int loc_as_cmp(struct loc_as* as1, struct loc_as* as2) {
  94         if (as1->number > as2->number)
  95                 return 1;
  96
  97         if (as1->number < as2->number)
  98                 return -1;
  99
 100         return 0;
 101 }
 102
 103 int loc_as_new_from_database_v0(struct loc_ctx* ctx, struct loc_stringpool* pool,
 104                 struct loc_as** as, const struct loc_database_as_v0* dbobj) {
 105         uint32_t number = be32toh(dbobj->number);
 106
 107         int r = loc_as_new(ctx, as, number);
 108         if (r)
 109                 return r;
 110
 111         const char* name = loc_stringpool_get(pool, be32toh(dbobj->name));
 112         r = loc_as_set_name(*as, name);
 113         if (r) {
 114                 loc_as_unref(*as);
 115                 return r;
 116         }
 117
 118         return 0;
 119 }
 120
 121 int loc_as_to_database_v0(struct loc_as* as, struct loc_stringpool* pool,
 122                 struct loc_database_as_v0* dbobj) {
 123         dbobj->number = htobe32(as->number);
 124
 125         // Save the name string in the string pool
 126         off_t name = loc_stringpool_add(pool, as->name ? as->name : "");
 127         dbobj->name = htobe32(name);
 128
 129         return 0;
 130 }