src/libimcv/imcv.c

   1 /*
   2  * Copyright (C) 2011 Andreas Steffen, HSR Hochschule fuer Technik Rapperswil
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  */
  14
  15 #include "imcv.h"
  16
  17 #include "utils.h"
  18 #include <debug.h>
  19
  20 #include <syslog.h>
  21
  22 #define IMCV_DEBUG_LEVEL        1
  23
  24 /**
  25  * Reference count for IMC/IMV instances
  26  */
  27 refcount_t ref = 0;
  28
  29 /**
  30  * Global configuration of imcv dbg function
  31  */
  32 static int  imcv_debug_level;
  33 static bool imcv_stderr_quiet;
  34
  35 /**
  36  * imvc dbg function
  37  */
  38 static void imcv_dbg(debug_t group, level_t level, char *fmt, ...)
  39 {
  40         int priority = LOG_INFO;
  41         char buffer[8192];
  42         char *current = buffer, *next;
  43         va_list args;
  44
  45         if (level <= imcv_debug_level)
  46         {
  47                 if (!imcv_stderr_quiet)
  48                 {
  49                         va_start(args, fmt);
  50                         fprintf(stderr, "[HSR] ");
  51                         vfprintf(stderr, fmt, args);
  52                         fprintf(stderr, "\n");
  53                         va_end(args);
  54                 }
  55
  56                 /* write in memory buffer first */
  57                 va_start(args, fmt);
  58                 vsnprintf(buffer, sizeof(buffer), fmt, args);
  59                 va_end(args);
  60
  61                 /* do a syslog with every line */
  62                 while (current)
  63                 {
  64                         next = strchr(current, '\n');
  65                         if (next)
  66                         {
  67                                 *(next++) = '\0';
  68                         }
  69                         syslog(priority, "[HSR] %s\n", current);
  70                         current = next;
  71                 }
  72         }
  73 }
  74
  75 /**
  76  * Described in header.
  77  */
  78 bool libimcv_init(void)
  79 {
  80         /* initialize libstrongswan library only once */
  81         if (lib)
  82         {
  83                 /* did main program initialize libstrongswan? */
  84                 if (ref == 0)
  85                 {
  86                         ref_get(&ref);
  87                 }
  88         }
  89         else
  90         {
  91                 /* we are the first to initialize libstrongswan */
  92                 if (!library_init(NULL))
  93                 {
  94                         return FALSE;
  95                 }
  96
  97                 if (!lib->plugins->load(lib->plugins, NULL, "random"))
  98                 {
  99                         library_deinit();
 100                         return FALSE;
 101                 }
 102
 103                 /* set the debug level and stderr output */
 104                 imcv_debug_level =  lib->settings->get_int(lib->settings,
 105                                                                         "libimcv.debug_level", IMCV_DEBUG_LEVEL);
 106                 imcv_stderr_quiet = lib->settings->get_int(lib->settings,
 107                                                                         "libimcv.stderr_quiet", FALSE);
 108
 109                 /* activate the imcv debugging hook */
 110                 dbg = imcv_dbg;
 111                 openlog("imcv", 0, LOG_DAEMON);
 112
 113                 DBG1(DBG_LIB, "libimcv initialized");
 114         }
 115         ref_get(&ref);
 116
 117         return TRUE;
 118 }
 119
 120 /**
 121  * Described in header.
 122  */
 123 void libimcv_deinit(void)
 124 {
 125         if (ref_put(&ref))
 126         {
 127                 DBG1(DBG_LIB, "libimcv terminated");
 128                 library_deinit();
 129         }
 130 }
 131
 132