src/libloc/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 <stdio.h>
  23 #include <syslog.h>
  24
  25 #include <libloc/libloc.h>
  26
  27 static inline void __attribute__((always_inline, format(printf, 2, 3)))
  28 loc_log_null(struct loc_ctx *ctx, const char *format, ...) {}
  29
  30 #define loc_log_cond(ctx, prio, arg...) \
  31         do { \
  32                 if (loc_get_log_priority(ctx) >= prio) \
  33                         loc_log(ctx, prio, __FILE__, __LINE__, __FUNCTION__, ## arg); \
  34         } while (0)
  35
  36 #ifdef ENABLE_DEBUG
  37 #  define DEBUG(ctx, arg...) loc_log_cond(ctx, LOG_DEBUG, ## arg)
  38 #else
  39 #  define DEBUG(ctx, arg...) loc_log_null(ctx, ## arg)
  40 #endif
  41
  42 #define INFO(ctx, arg...) loc_log_cond(ctx, LOG_INFO, ## arg)
  43 #define ERROR(ctx, arg...) loc_log_cond(ctx, LOG_ERR, ## arg)
  44
  45 #ifndef HAVE_SECURE_GETENV
  46 #  ifdef HAVE___SECURE_GETENV
  47 #    define secure_getenv __secure_getenv
  48 #  else
  49 #    define secure_getenv getenv
  50 #  endif
  51 #endif
  52
  53 #define LOC_EXPORT __attribute__ ((visibility("default")))
  54
  55 void loc_log(struct loc_ctx *ctx,
  56         int priority, const char *file, int line, const char *fn,
  57         const char *format, ...) __attribute__((format(printf, 6, 7)));
  58
  59
  60 static inline void hexdump(struct loc_ctx* ctx, const void* addr, size_t len) {
  61         char buffer_hex[16 * 3 + 6];
  62         char buffer_ascii[17];
  63
  64         unsigned int i = 0;
  65         unsigned char* p = (unsigned char*)addr;
  66
  67         DEBUG(ctx, "Dumping %zu byte(s)\n", len);
  68
  69         if (!len)
  70                 return;
  71
  72         // Process every byte in the data
  73         for (i = 0; i < len; i++) {
  74                 // Multiple of 16 means new line (with line offset)
  75                 if ((i % 16) == 0) {
  76                         // Just don't print ASCII for the zeroth line
  77                         if (i != 0)
  78                                 DEBUG(ctx, "  %s %s\n", buffer_hex, buffer_ascii);
  79
  80                         // Output the offset.
  81                         sprintf(buffer_hex, "%04x ", i);
  82                 }
  83
  84                 // Now the hex code for the specific character
  85                 sprintf(buffer_hex + 5 + ((i % 16) * 3), " %02x", p[i]);
  86
  87                 // And store a printable ASCII character for later
  88                 if ((p[i] < 0x20) || (p[i] > 0x7e))
  89                         buffer_ascii[i % 16] = '.';
  90                 else
  91                         buffer_ascii[i % 16] = p[i];
  92
  93                 // Terminate string
  94                 buffer_ascii[(i % 16) + 1] = '\0';
  95         }
  96
  97         // Pad out last line if not exactly 16 characters
  98         while ((i % 16) != 0) {
  99                 sprintf(buffer_hex + 5 + ((i % 16) * 3), "   ");
 100                 i++;
 101         }
 102
 103         // And print the final bit
 104         DEBUG(ctx, "  %s %s\n", buffer_hex, buffer_ascii);
 105 }
 106
 107 #endif
 108 #endif