src/bancache.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *          the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 /* $Core: libIRCDbancache */
  15
  16 #include "inspircd.h"
  17 #include "bancache.h"
  18
  19 BanCacheHit *BanCacheManager::AddHit(const std::string &ip, const std::string &type, const std::string &reason)
  20 {
  21         BanCacheHit *b;
  22
  23         if (this->BanHash->find(ip) != this->BanHash->end()) // can't have two cache entries on the same IP, sorry..
  24                 return NULL;
  25
  26         b = new BanCacheHit(ServerInstance, ip, type, reason);
  27
  28         this->BanHash->insert(std::make_pair(ip, b));
  29         return b;
  30 }
  31
  32 BanCacheHit *BanCacheManager::GetHit(const std::string &ip)
  33 {
  34         BanCacheHash::iterator i = this->BanHash->find(ip);
  35
  36         if (i == this->BanHash->end())
  37                 return NULL; // free and safe
  38         else
  39         {
  40                 if (time(NULL) > i->second->Expiry)
  41                 {
  42                         ServerInstance->Log(DEBUG, "Hit on " + ip + " is out of date, removing!");
  43                         RemoveHit(i->second);
  44                         return NULL; // out of date
  45                 }
  46
  47                 return i->second; // hit.
  48         }
  49 }
  50
  51 bool BanCacheManager::RemoveHit(BanCacheHit *b)
  52 {
  53         BanCacheHash::iterator i;
  54
  55         if (!b)
  56                 return false; // I don't think so.
  57
  58         i = this->BanHash->find(b->IP);
  59
  60         if (i == this->BanHash->end())
  61         {
  62                 // err..
  63                 ServerInstance->Log(DEBUG, "BanCacheManager::RemoveHit(): I got asked to remove a hit that wasn't in the hash(?)");
  64         }
  65         else
  66         {
  67                 this->BanHash->erase(i);
  68         }
  69
  70         delete b;
  71         return true;
  72 }
  73
  74 unsigned int BanCacheManager::RemoveEntries(const std::string &type, bool positive)
  75 {
  76         int removed = 0;
  77
  78         BanCacheHash::iterator safei;
  79
  80         if (positive)
  81                 ServerInstance->Log(DEBUG, "BanCacheManager::RemoveEntries(): Removing positive hits for " + type);
  82         else
  83                 ServerInstance->Log(DEBUG, "BanCacheManager::RemoveEntries(): Removing negative hits for " + type);
  84
  85         for (BanCacheHash::iterator n = BanHash->begin(); n != BanHash->end(); )
  86         {
  87                 safei = n;
  88                 safei++;
  89
  90                 BanCacheHit *b = n->second;
  91
  92                 /* Safe to delete items here through iterator 'n' */
  93                 if (b->Type == type || !positive) // if removing negative hits, ignore type..
  94                 {
  95                         if ((positive && !b->Reason.empty()) || b->Reason.empty())
  96                         {
  97                                 /* we need to remove this one. */
  98                                 ServerInstance->Log(DEBUG, "BanCacheManager::RemoveEntries(): Removing a hit on " + b->IP);
  99                                 delete b;
 100                                 b = NULL;
 101                                 BanHash->erase(n); // WORD TO THE WISE: don't use RemoveHit here, because we MUST remove the iterator in a safe way.
 102                                 removed++;
 103                         }
 104                 }
 105
 106                 /* End of safe section */
 107                 n = safei;
 108         }
 109
 110
 111         return removed;
 112 }
 113
 114 void BanCacheManager::RehashCache()
 115 {
 116         BanCacheHash* NewHash = new BanCacheHash();
 117
 118         BanCacheHash::iterator safei;
 119         for (BanCacheHash::iterator n = BanHash->begin(); n != BanHash->end(); )
 120         {
 121                 safei = n;
 122                 safei++;
 123
 124                 /* Safe to delete items here through iterator 'n' */
 125                 BanCacheHit *b = n->second;
 126
 127                 if (time(NULL) > b->Expiry)
 128                 {
 129                         /* we need to remove this one. */
 130                         delete b;
 131                         b = NULL;
 132                         BanHash->erase(n); // WORD TO THE WISE: don't use RemoveHit here, because we MUST remove the iterator in a safe way.
 133                 }
 134                 else
 135                 {
 136                         /* Actually inserts a std::pair */
 137                         NewHash->insert(*n);
 138                 }
 139
 140                 /* End of safe section */
 141
 142                 n = safei;
 143         }
 144
 145         delete BanHash;
 146         BanHash = NewHash;
 147 }