src/loc/private.h

   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 #ifndef LIBLOC_PRIVATE_H
  18 #define LIBLOC_PRIVATE_H
  19
  20 #ifdef LIBLOC_PRIVATE
  21
  22 #include <netinet/in.h>
  23 #include <stdbool.h>
  24 #include <syslog.h>
  25
  26 #include <loc/libloc.h>
  27
  28 static inline void __attribute__((always_inline, format(printf, 2, 3)))
  29 loc_log_null(struct loc_ctx *ctx, const char *format, ...) {}
  30
  31 #define loc_log_cond(ctx, prio, arg...) \
  32         do { \
  33                 if (loc_get_log_priority(ctx) >= prio) \
  34                         loc_log(ctx, prio, __FILE__, __LINE__, __FUNCTION__, ## arg); \
  35         } while (0)
  36
  37 #ifdef ENABLE_DEBUG
  38 #  define DEBUG(ctx, arg...) loc_log_cond(ctx, LOG_DEBUG, ## arg)
  39 #else
  40 #  define DEBUG(ctx, arg...) loc_log_null(ctx, ## arg)
  41 #endif
  42
  43 #define INFO(ctx, arg...) loc_log_cond(ctx, LOG_INFO, ## arg)
  44 #define ERROR(ctx, arg...) loc_log_cond(ctx, LOG_ERR, ## arg)
  45
  46 #ifndef HAVE_SECURE_GETENV
  47 #  ifdef HAVE___SECURE_GETENV
  48 #    define secure_getenv __secure_getenv
  49 #  else
  50 #    error neither secure_getenv nor __secure_getenv is available
  51 #  endif
  52 #endif
  53
  54 #define LOC_EXPORT __attribute__ ((visibility("default")))
  55
  56 void loc_log(struct loc_ctx *ctx,
  57         int priority, const char *file, int line, const char *fn,
  58         const char *format, ...) __attribute__((format(printf, 6, 7)));
  59
  60 static inline int in6_addr_cmp(const struct in6_addr* a1, const struct in6_addr* a2) {
  61         for (unsigned int i = 0; i < 16; i++) {
  62                 if (a1->s6_addr[i] > a2->s6_addr[i])
  63                         return 1;
  64
  65                 else if (a1->s6_addr[i] < a2->s6_addr[i])
  66                         return -1;
  67         }
  68
  69         return 0;
  70 }
  71
  72 static inline int in6_addr_get_bit(const struct in6_addr* address, unsigned int i) {
  73         return ((address->s6_addr[i / 8] >> (7 - (i % 8))) & 1);
  74 }
  75
  76 static inline void in6_addr_set_bit(struct in6_addr* address, unsigned int i, unsigned int val) {
  77         address->s6_addr[i / 8] ^= (-val ^ address->s6_addr[i / 8]) & (1 << (7 - (i % 8)));
  78 }
  79
  80 #endif
  81 #endif