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                 log(DEBUG,"Create class Lookup");
 103         }
 104
 105         void Reset()
 106         {
 107                 strcpy(u,"");
 108                 log(DEBUG,"Reset class Lookup");
 109         }
 110
 111         ~Lookup()
 112         {
 113                 log(DEBUG,"Delete class Lookup");
 114         }
 115
 116         bool DoLookup(std::string nick)
 117         {
 118                 hostname = "";
 119                 userrec* usr = Find(nick);
 120                 if (usr)
 121                 {
 122                         log(DEBUG,"New Lookup class for %s with DNSServer set to '%s'",nick.c_str(),DNSServer);
 123                         resolver1.SetNS(std::string(DNSServer));
 124                         if (!resolver1.ReverseLookup(std::string(usr->host)))
 125                         {
 126                                 log(DEBUG,"ReverseLookup didnt return true, we're outta here");
 127                                 return false;
 128                         }
 129                         strlcpy(u,nick.c_str(),NICKMAX);
 130                         return true;
 131                 }
 132                 log(DEBUG,"We couldnt find that user");
 133                 return false;
 134         }
 135
 136         bool Done()
 137         {
 138                 if (hostname != "")
 139                 {
 140                         log(DEBUG,"Doing forward lookup here with host %s",hostname.c_str());
 141                         // doing forward lookup
 142                         userrec* usr = NULL;
 143                         if (resolver2.HasResult())
 144                         {
 145                                 log(DEBUG,"resolver2 has result");
 146                                 if (resolver2.GetFD() != 0)
 147                                 {
 148                                         std::string ip = resolver2.GetResultIP();
 149                                         log(DEBUG,"FORWARD RESULT! %s",ip.c_str());
 150
 151                                         usr = Find(u);
 152                                         if (usr)
 153                                         {
 154                                                 if (usr->registered > 3)
 155                                                 {
 156                                                         log(DEBUG,"Point 1: Returning true as usr->dns_done is true");
 157                                                         usr->dns_done = true;
 158                                                         return true;
 159                                                 }
 160                                                 if ((hostname != "") && (usr->registered != 7))
 161                                                 {
 162                                                         if (std::string(usr->ip) == ip)
 163                                                         {
 164                                                                 strlcpy(usr->host,hostname.c_str(),MAXBUF);
 165                                                                 strlcpy(usr->dhost,hostname.c_str(),MAXBUF);
 166                                                                 log(DEBUG,"Forward and reverse match, assigning hostname");
 167                                                         }
 168                                                         else
 169                                                         {
 170                                                                 log(DEBUG,"AWOOGA! Forward lookup doesn't match reverse: R='%s',F='%s',IP='%s'",hostname.c_str(),ip.c_str(),usr->ip);
 171                                                         }
 172                                                         usr->dns_done = true;
 173                                                         return true;
 174                                                 }
 175                                         }
 176                                 }
 177                                 else
 178                                 {
 179                                         usr = Find(u);
 180                                         if (usr)
 181                                         {
 182                                                 log(DEBUG,"Point 2: Returning true");
 183                                                 usr->dns_done = true;
 184                                         }
 185                                         return true;
 186                                 }
 187                         }
 188                         log(DEBUG,"Returning false in forward");
 189                         return false;
 190                 }
 191                 else
 192                 {
 193                         // doing reverse lookup
 194                         userrec* usr = NULL;
 195                         if (resolver1.HasResult())
 196                         {
 197                                 usr = Find(u);
 198                                 if ((usr) && (usr->dns_done))
 199                                         return true;
 200                                 if (resolver1.GetFD() != 0)
 201                                 {
 202                                         hostname = resolver1.GetResult();
 203                                         if (usr)
 204                                         {
 205                                                 if ((usr->registered > 3) || (hostname == ""))
 206                                                 {
 207                                                         log(DEBUG,"Hostname is blank and user->registered > 3, returning true and setting done");
 208                                                         usr->dns_done = true;
 209                                                         return true;
 210                                                 }
 211                                         }
 212                                         if (hostname != "")
 213                                         {
 214                                                 log(DEBUG,"Starting forwardlookup now for host '%s'...",hostname.c_str());
 215                                                 resolver2.ForwardLookup(hostname);
 216                                         }
 217                                 }
 218                         }
 219                 }
 220                 log(DEBUG,"Returning false");
 221                 return false;
 222         }
 223
 224         int GetFD()
 225         {
 226                 userrec* usr = Find(u);
 227                 if (!usr)
 228                         return 0;
 229                 if (usr->dns_done)
 230                         return 0;
 231                 return usr->fd;
 232         }
 233 };
 234
 235 Lookup dnsq[255];
 236
 237 bool lookup_dns(std::string nick)
 238 {
 239         userrec* u = Find(nick);
 240         if (u)
 241         {
 242                 // place a new user into the queue...
 243                 log(DEBUG,"Queueing DNS lookup for %s",u->nick);
 244                 WriteServ(u->fd,"NOTICE Auth :Looking up your hostname...");
 245                 Lookup L;
 246                 if (L.DoLookup(nick))
 247                 {
 248                         for (int j = 0; j < 255; j++)
 249                         {
 250                                 if (!dnsq[j].GetFD())
 251                                 {
 252                                         dnsq[j] = L;
 253                                         return true;
 254                                 }
 255                         }
 256                         // calculate the maximum value, this saves cpu time later
 257                         for (int p = 0; p < 255; p++)
 258                                 if (dnsq[p].GetFD())
 259                                         max_fd_alloc = p;
 260                 }
 261                 else
 262                 {
 263                         return false;
 264                 }
 265         }
 266         return false;
 267 }
 268
 269 void dns_poll()
 270 {
 271         // do we have items in the queue?
 272         for (int j = 0; j <= max_fd_alloc; j++)
 273         {
 274                 // are any ready, or stale?
 275                 if (dnsq[j].GetFD())
 276                 {
 277                         if (dnsq[j].Done())
 278                         {
 279                                 dnsq[j].Reset();
 280                         }
 281                 }
 282         }
 283         // looks like someones freed an item, recalculate end of list.
 284         if ((!dnsq[max_fd_alloc].GetFD()) && (max_fd_alloc != 0))
 285                 for (int p = 0; p < 255; p++)
 286                         if (dnsq[p].GetFD())
 287                                 max_fd_alloc = p;
 288
 289 }