src/dnsqueue.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  Inspire is copyright (C) 2002-2004 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 /* Now with added unF! ;) */
  18
  19 using namespace std;
  20
  21 #include "inspircd_config.h"
  22 #include "inspircd.h"
  23 #include "inspircd_io.h"
  24 #include "inspircd_util.h"
  25 #include <unistd.h>
  26 #include <sys/errno.h>
  27 #include <sys/ioctl.h>
  28 #include <sys/utsname.h>
  29 #include <cstdio>
  30 #include <time.h>
  31 #include <string>
  32 #ifdef GCC3
  33 #include <ext/hash_map>
  34 #else
  35 #include <hash_map>
  36 #endif
  37 #include <map>
  38 #include <sstream>
  39 #include <vector>
  40 #include <deque>
  41 #include "connection.h"
  42 #include "users.h"
  43 #include "servers.h"
  44 #include "ctables.h"
  45 #include "globals.h"
  46 #include "modules.h"
  47 #include "dynamic.h"
  48 #include "wildcard.h"
  49 #include "message.h"
  50 #include "mode.h"
  51 #include "commands.h"
  52 #include "xline.h"
  53 #include "inspstring.h"
  54 #include "dnsqueue.h"
  55 #include <time.h>
  56 #include <sys/types.h>
  57 #include <sys/socket.h>
  58 #include <sys/poll.h>
  59 #include <sys/time.h>
  60 #include <netinet/in.h>
  61 #include <string.h>
  62 #include "dns.h"
  63 #include "helperfuncs.h"
  64 #include "hashcomp.h"
  65
  66 extern int MaxWhoResults;
  67
  68 extern std::vector<Module*> modules;
  69 extern std::vector<std::string> module_names;
  70 extern std::vector<ircd_module*> factory;
  71
  72 extern int MODCOUNT;
  73
  74 typedef nspace::hash_map<std::string, userrec*, nspace::hash<string>, irc::StrHashComp> user_hash;
  75 typedef nspace::hash_map<std::string, chanrec*, nspace::hash<string>, irc::StrHashComp> chan_hash;
  76 typedef nspace::hash_map<in_addr,string*, nspace::hash<in_addr>, irc::InAddr_HashComp> address_cache;
  77 typedef nspace::hash_map<std::string, WhoWasUser*, nspace::hash<string>, irc::StrHashComp> whowas_hash;
  78 typedef std::deque<command_t> command_table;
  79
  80 extern user_hash clientlist;
  81 extern chan_hash chanlist;
  82 extern whowas_hash whowas;
  83 extern command_table cmdlist;
  84
  85 extern ClassVector Classes;
  86
  87 extern char DNSServer[MAXBUF];
  88 long max_fd_alloc = 0;
  89
  90 extern time_t TIME;
  91
  92 class Lookup {
  93 private:
  94         DNS resolver;
  95         char u[NICKMAX];
  96 public:
  97         Lookup()
  98         {
  99                 strcpy(u,"");
 100         }
 101
 102         void Reset()
 103         {
 104                 strcpy(u,"");
 105         }
 106
 107         ~Lookup()
 108         {
 109         }
 110
 111         bool DoLookup(std::string nick)
 112         {
 113                 userrec* usr = Find(nick);
 114                 if (usr)
 115                 {
 116                         log(DEBUG,"New Lookup class for %s with DNSServer set to '%s'",nick.c_str(),DNSServer);
 117                         resolver.SetNS(std::string(DNSServer));
 118                         if (!resolver.ReverseLookup(std::string(usr->host)))
 119                                 return false;
 120                         strlcpy(u,nick.c_str(),NICKMAX);
 121                         return true;
 122                 }
 123                 return false;
 124         }
 125
 126         bool Done()
 127         {
 128                 userrec* usr = NULL;
 129                 if (resolver.HasResult())
 130                 {
 131                         if (resolver.GetFD() != 0)
 132                         {
 133                                 std::string hostname = resolver.GetResult();
 134                                 log(DEBUG,"RESULT! %s",hostname.c_str());
 135                                 usr = Find(u);
 136                                 if (usr)
 137                                 {
 138                                         if (usr->registered > 3)
 139                                         {
 140                                                 usr->dns_done = true;
 141                                                 return true;
 142                                         }
 143                                         if ((hostname != "") && (usr->registered != 7))
 144                                         {
 145                                                 strlcpy(usr->host,hostname.c_str(),MAXBUF);
 146                                                 strlcpy(usr->dhost,hostname.c_str(),MAXBUF);
 147                                                 WriteServ(usr->fd,"NOTICE Auth :Resolved your hostname: %s",hostname.c_str());
 148                                                 usr->dns_done = true;
 149                                                 return true;
 150                                         }
 151                                         usr->dns_done = true;
 152                                         return true;
 153                                 }
 154                         }
 155                         else
 156                         {
 157                                 usr = Find(u);
 158                                 if (usr)
 159                                         usr->dns_done = true;
 160                                 return true;
 161                         }
 162                 }
 163                 return false;
 164         }
 165
 166         int GetFD()
 167         {
 168                 userrec* usr = Find(u);
 169                 if (!usr)
 170                         return 0;
 171                 if (usr->dns_done)
 172                         return 0;
 173                 return usr->fd;
 174         }
 175 };
 176
 177 Lookup dnsq[255];
 178
 179 bool lookup_dns(std::string nick)
 180 {
 181         userrec* u = Find(nick);
 182         if (u)
 183         {
 184                 // place a new user into the queue...
 185                 log(DEBUG,"Queueing DNS lookup for %s",u->nick);
 186                 WriteServ(u->fd,"NOTICE Auth :Looking up your hostname...");
 187                 Lookup L;
 188                 if (L.DoLookup(nick))
 189                 {
 190                         for (int j = 0; j < 255; j++)
 191                         {
 192                                 if (!dnsq[j].GetFD())
 193                                 {
 194                                         dnsq[j] = L;
 195                                         return true;
 196                                 }
 197                         }
 198                         // calculate the maximum value, this saves cpu time later
 199                         for (int p = 0; p < 255; p++)
 200                                 if (dnsq[p].GetFD())
 201                                         max_fd_alloc = p;
 202                 }
 203                 else
 204                 {
 205                         return false;
 206                 }
 207         }
 208         return false;
 209 }
 210
 211 void dns_poll()
 212 {
 213         // do we have items in the queue?
 214         for (int j = 0; j <= max_fd_alloc; j++)
 215         {
 216                 // are any ready, or stale?
 217                 if (dnsq[j].GetFD())
 218                 {
 219                         if (dnsq[j].Done())
 220                         {
 221                                 dnsq[j].Reset();
 222                         }
 223                 }
 224         }
 225         // looks like someones freed an item, recalculate end of list.
 226         if ((!dnsq[max_fd_alloc].GetFD()) && (max_fd_alloc != 0))
 227                 for (int p = 0; p < 255; p++)
 228                         if (dnsq[p].GetFD())
 229                                 max_fd_alloc = p;
 230
 231 }