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 "users.h"
  42 #include "ctables.h"
  43 #include "globals.h"
  44 #include "modules.h"
  45 #include "dynamic.h"
  46 #include "wildcard.h"
  47 #include "message.h"
  48 #include "mode.h"
  49 #include "commands.h"
  50 #include "xline.h"
  51 #include "inspstring.h"
  52 #include "dnsqueue.h"
  53 #include <time.h>
  54 #include <sys/types.h>
  55 #include <sys/socket.h>
  56 #include <sys/poll.h>
  57 #include <sys/time.h>
  58 #include <netinet/in.h>
  59 #include <string.h>
  60 #include "dns.h"
  61 #include "helperfuncs.h"
  62 #include "hashcomp.h"
  63
  64 extern int MaxWhoResults;
  65
  66 extern std::vector<Module*> modules;
  67 extern std::vector<std::string> module_names;
  68 extern std::vector<ircd_module*> factory;
  69
  70 extern int MODCOUNT;
  71
  72 typedef nspace::hash_map<std::string, userrec*, nspace::hash<string>, irc::StrHashComp> user_hash;
  73 typedef nspace::hash_map<std::string, chanrec*, nspace::hash<string>, irc::StrHashComp> chan_hash;
  74 typedef nspace::hash_map<in_addr,string*, nspace::hash<in_addr>, irc::InAddr_HashComp> address_cache;
  75 typedef nspace::hash_map<std::string, WhoWasUser*, nspace::hash<string>, irc::StrHashComp> whowas_hash;
  76 typedef std::deque<command_t> command_table;
  77
  78 extern user_hash clientlist;
  79 extern chan_hash chanlist;
  80 extern whowas_hash whowas;
  81 extern command_table cmdlist;
  82
  83 extern ClassVector Classes;
  84
  85 extern char DNSServer[MAXBUF];
  86 long max_fd_alloc = 0;
  87
  88 extern time_t TIME;
  89
  90 //enum LookupState { reverse, forward };
  91
  92 class Lookup {
  93 private:
  94         DNS resolver1;
  95         DNS resolver2;
  96         char u[NICKMAX];
  97         std::string hostname;
  98 public:
  99         Lookup()
 100         {
 101                 strcpy(u,"");
 102         }
 103
 104         void Reset()
 105         {
 106                 strcpy(u,"");
 107         }
 108
 109         ~Lookup()
 110         {
 111         }
 112
 113         bool DoLookup(std::string nick)
 114         {
 115                 hostname = "";
 116                 userrec* usr = Find(nick);
 117                 if (usr)
 118                 {
 119                         log(DEBUG,"New Lookup class for %s with DNSServer set to '%s'",nick.c_str(),DNSServer);
 120                         resolver1.SetNS(std::string(DNSServer));
 121                         if (!resolver1.ReverseLookup(std::string(usr->host)))
 122                                 return false;
 123                         strlcpy(u,nick.c_str(),NICKMAX);
 124                         return true;
 125                 }
 126                 return false;
 127         }
 128
 129         bool Done()
 130         {
 131                 if (hostname != "")
 132                 {
 133                         // doing forward lookup
 134                         userrec* usr = NULL;
 135                         if (resolver2.HasResult())
 136                         {
 137                                 if (resolver2.GetFD() != 0)
 138                                 {
 139                                         std::string ip = resolver2.GetResultIP();
 140                                         log(DEBUG,"FORWARD RESULT! %s",ip.c_str());
 141
 142                                         usr = Find(u);
 143                                         if (usr)
 144                                         {
 145                                                 if (usr->registered > 3)
 146                                                 {
 147                                                         usr->dns_done = true;
 148                                                         return true;
 149                                                 }
 150                                                 if ((hostname != "") && (usr->registered != 7))
 151                                                 {
 152                                                         if (std::string(usr->ip) == ip)
 153                                                         {
 154                                                                 strlcpy(usr->host,hostname.c_str(),MAXBUF);
 155                                                                 strlcpy(usr->dhost,hostname.c_str(),MAXBUF);
 156                                                                 log(DEBUG,"Forward and reverse match, assigning hostname");
 157                                                         }
 158                                                         else
 159                                                         {
 160                                                                 log(DEBUG,"AWOOGA! Forward lookup doesn't match reverse: R='%s',F='%s',IP='%s'",hostname.c_str(),ip.c_str(),usr->ip);
 161                                                         }
 162                                                         usr->dns_done = true;
 163                                                         return true;
 164                                                 }
 165                                         }
 166                                 }
 167                                 else
 168                                 {
 169                                         usr = Find(u);
 170                                         if (usr)
 171                                                 usr->dns_done = true;
 172                                         return true;
 173                                 }
 174                         }
 175                 }
 176                 else
 177                 {
 178                         // doing reverse lookup
 179                         userrec* usr = NULL;
 180                         if (resolver1.HasResult())
 181                         {
 182                                 usr = Find(u);
 183                                 if ((usr) && (usr->dns_done))
 184                                         return true;
 185                                 if (resolver1.GetFD() != 0)
 186                                 {
 187                                         hostname = resolver1.GetResult();
 188                                         if (usr)
 189                                         {
 190                                                 if ((usr->registered > 3) && (hostname == ""))
 191                                                 {
 192                                                         usr->dns_done = true;
 193                                                         return true;
 194                                                 }
 195                                         }
 196                                         resolver2.ForwardLookup(hostname);
 197                                 }
 198                         }
 199                 }
 200                 return false;
 201         }
 202
 203         int GetFD()
 204         {
 205                 userrec* usr = Find(u);
 206                 if (!usr)
 207                         return 0;
 208                 if (usr->dns_done)
 209                         return 0;
 210                 return usr->fd;
 211         }
 212 };
 213
 214 Lookup dnsq[255];
 215
 216 bool lookup_dns(std::string nick)
 217 {
 218         userrec* u = Find(nick);
 219         if (u)
 220         {
 221                 // place a new user into the queue...
 222                 log(DEBUG,"Queueing DNS lookup for %s",u->nick);
 223                 WriteServ(u->fd,"NOTICE Auth :Looking up your hostname...");
 224                 Lookup L;
 225                 if (L.DoLookup(nick))
 226                 {
 227                         for (int j = 0; j < 255; j++)
 228                         {
 229                                 if (!dnsq[j].GetFD())
 230                                 {
 231                                         dnsq[j] = L;
 232                                         return true;
 233                                 }
 234                         }
 235                         // calculate the maximum value, this saves cpu time later
 236                         for (int p = 0; p < 255; p++)
 237                                 if (dnsq[p].GetFD())
 238                                         max_fd_alloc = p;
 239                 }
 240                 else
 241                 {
 242                         return false;
 243                 }
 244         }
 245         return false;
 246 }
 247
 248 void dns_poll()
 249 {
 250         // do we have items in the queue?
 251         for (int j = 0; j <= max_fd_alloc; j++)
 252         {
 253                 // are any ready, or stale?
 254                 if (dnsq[j].GetFD())
 255                 {
 256                         if (dnsq[j].Done())
 257                         {
 258                                 dnsq[j].Reset();
 259                         }
 260                 }
 261         }
 262         // looks like someones freed an item, recalculate end of list.
 263         if ((!dnsq[max_fd_alloc].GetFD()) && (max_fd_alloc != 0))
 264                 for (int p = 0; p < 255; p++)
 265                         if (dnsq[p].GetFD())
 266                                 max_fd_alloc = p;
 267
 268 }