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 class Lookup {
  91 private:
  92         DNS resolver;
  93         char u[NICKMAX];
  94 public:
  95         Lookup()
  96         {
  97                 strcpy(u,"");
  98         }
  99
 100         void Reset()
 101         {
 102                 strcpy(u,"");
 103         }
 104
 105         ~Lookup()
 106         {
 107         }
 108
 109         bool DoLookup(std::string nick)
 110         {
 111                 userrec* usr = Find(nick);
 112                 if (usr)
 113                 {
 114                         log(DEBUG,"New Lookup class for %s with DNSServer set to '%s'",nick.c_str(),DNSServer);
 115                         resolver.SetNS(std::string(DNSServer));
 116                         if (!resolver.ReverseLookup(std::string(usr->host)))
 117                                 return false;
 118                         strlcpy(u,nick.c_str(),NICKMAX);
 119                         return true;
 120                 }
 121                 return false;
 122         }
 123
 124         bool Done()
 125         {
 126                 userrec* usr = NULL;
 127                 if (resolver.HasResult())
 128                 {
 129                         if (resolver.GetFD() != 0)
 130                         {
 131                                 std::string hostname = resolver.GetResult();
 132                                 log(DEBUG,"RESULT! %s",hostname.c_str());
 133                                 usr = Find(u);
 134                                 if (usr)
 135                                 {
 136                                         if (usr->registered > 3)
 137                                         {
 138                                                 usr->dns_done = true;
 139                                                 return true;
 140                                         }
 141                                         if ((hostname != "") && (usr->registered != 7))
 142                                         {
 143                                                 strlcpy(usr->host,hostname.c_str(),MAXBUF);
 144                                                 strlcpy(usr->dhost,hostname.c_str(),MAXBUF);
 145                                                 WriteServ(usr->fd,"NOTICE Auth :Resolved your hostname: %s",hostname.c_str());
 146                                                 usr->dns_done = true;
 147                                                 return true;
 148                                         }
 149                                         usr->dns_done = true;
 150                                         return true;
 151                                 }
 152                         }
 153                         else
 154                         {
 155                                 usr = Find(u);
 156                                 if (usr)
 157                                         usr->dns_done = true;
 158                                 return true;
 159                         }
 160                 }
 161                 return false;
 162         }
 163
 164         int GetFD()
 165         {
 166                 userrec* usr = Find(u);
 167                 if (!usr)
 168                         return 0;
 169                 if (usr->dns_done)
 170                         return 0;
 171                 return usr->fd;
 172         }
 173 };
 174
 175 Lookup dnsq[255];
 176
 177 bool lookup_dns(std::string nick)
 178 {
 179         userrec* u = Find(nick);
 180         if (u)
 181         {
 182                 // place a new user into the queue...
 183                 log(DEBUG,"Queueing DNS lookup for %s",u->nick);
 184                 WriteServ(u->fd,"NOTICE Auth :Looking up your hostname...");
 185                 Lookup L;
 186                 if (L.DoLookup(nick))
 187                 {
 188                         for (int j = 0; j < 255; j++)
 189                         {
 190                                 if (!dnsq[j].GetFD())
 191                                 {
 192                                         dnsq[j] = L;
 193                                         return true;
 194                                 }
 195                         }
 196                         // calculate the maximum value, this saves cpu time later
 197                         for (int p = 0; p < 255; p++)
 198                                 if (dnsq[p].GetFD())
 199                                         max_fd_alloc = p;
 200                 }
 201                 else
 202                 {
 203                         return false;
 204                 }
 205         }
 206         return false;
 207 }
 208
 209 void dns_poll()
 210 {
 211         // do we have items in the queue?
 212         for (int j = 0; j <= max_fd_alloc; j++)
 213         {
 214                 // are any ready, or stale?
 215                 if (dnsq[j].GetFD())
 216                 {
 217                         if (dnsq[j].Done())
 218                         {
 219                                 dnsq[j].Reset();
 220                         }
 221                 }
 222         }
 223         // looks like someones freed an item, recalculate end of list.
 224         if ((!dnsq[max_fd_alloc].GetFD()) && (max_fd_alloc != 0))
 225                 for (int p = 0; p < 255; p++)
 226                         if (dnsq[p].GetFD())
 227                                 max_fd_alloc = p;
 228
 229 }