src/dnsqueue.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 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 using namespace std;
  18
  19 #include "inspircd_config.h"
  20 #include "inspircd.h"
  21 #include "inspircd_io.h"
  22 #include <unistd.h>
  23 #include <sys/errno.h>
  24 #include <sys/ioctl.h>
  25 #include <sys/utsname.h>
  26 #include <cstdio>
  27 #include <time.h>
  28 #include <string>
  29 #ifdef GCC3
  30 #include <ext/hash_map>
  31 #else
  32 #include <hash_map>
  33 #endif
  34 #include <map>
  35 #include <sstream>
  36 #include <vector>
  37 #include <deque>
  38 #include "users.h"
  39 #include "globals.h"
  40 #include "inspstring.h"
  41 #include "dnsqueue.h"
  42 #include <time.h>
  43 #include <sys/types.h>
  44 #include <sys/socket.h>
  45 #include <sys/time.h>
  46 #include <netinet/in.h>
  47 #include <string.h>
  48 #include "dns.h"
  49 #include "helperfuncs.h"
  50 #include "hashcomp.h"
  51 #include "socketengine.h"
  52
  53 extern ServerConfig* Config;
  54 extern InspIRCd* ServerInstance;
  55
  56 address_cache addrcache;
  57
  58 class Lookup;
  59
  60 Lookup* dnslist[MAX_DESCRIPTORS];
  61
  62 //enum LookupState { reverse, forward };
  63
  64 class Lookup {
  65 private:
  66         DNS resolver1;
  67         DNS resolver2;
  68         char u[NICKMAX];
  69         std::string hostname;
  70 public:
  71         Lookup()
  72         {
  73                 *u = 0;
  74                 hostname = "";
  75         }
  76
  77         void Reset()
  78         {
  79                 *u = 0;
  80                 hostname = "";
  81         }
  82
  83         ~Lookup()
  84         {
  85         }
  86
  87         bool DoLookup(std::string nick)
  88         {
  89                 hostname = "";
  90                 userrec* usr = Find(nick);
  91                 if (usr)
  92                 {
  93                         resolver1.SetNS(std::string(Config->DNSServer));
  94                         if (!resolver1.ReverseLookup(std::string(usr->host)))
  95                         {
  96                                 return false;
  97                         }
  98                         strlcpy(u,nick.c_str(),NICKMAX-1);
  99
 100                         /* ASSOCIATE WITH DNS LOOKUP LIST */
 101                         if (resolver1.GetFD() != -1)
 102                         {
 103                                 dnslist[resolver1.GetFD()] = this;
 104                                 return true;
 105                         }
 106                 }
 107                 return false;
 108         }
 109
 110         bool Done(int fdcheck)
 111         {
 112                 if (hostname != "")
 113                 {
 114                         // doing forward lookup
 115                         userrec* usr = NULL;
 116                         if (resolver2.HasResult(fdcheck))
 117                         {
 118                                 if (resolver2.GetFD() != -1)
 119                                 {
 120                                         dnslist[resolver2.GetFD()] = NULL;
 121                                         std::string ip = resolver2.GetResultIP();
 122                                         usr = Find(u);
 123                                         if (usr)
 124                                         {
 125                                                 if (usr->registered > 3)
 126                                                 {
 127                                                         usr->dns_done = true;
 128                                                         return true;
 129                                                 }
 130                                                 if ((hostname != "") && (usr->registered != 7))
 131                                                 {
 132                                                         if (std::string((char*)inet_ntoa(usr->ip4)) == ip)
 133                                                         {
 134                                                                 strlcpy(usr->host,hostname.c_str(),MAXBUF);
 135                                                                 strlcpy(usr->dhost,hostname.c_str(),MAXBUF);
 136                                                                 /*address_cache::iterator address = addrcache.find(usr->ip4);
 137                                                                 if (address == addrcache.end())
 138                                                                 {
 139                                                                         log(DEBUG,"Caching hostname %s -> %s",(char*)inet_ntoa(usr->ip4),hostname.c_str());
 140                                                                         addrcache[usr->ip4] = new std::string(hostname);
 141                                                                 }*/
 142                                                                 WriteServ(usr->fd,"NOTICE Auth :*** Found your hostname");
 143                                                         }
 144                                                         usr->dns_done = true;
 145                                                         return true;
 146                                                 }
 147                                         }
 148                                 }
 149                                 else
 150                                 {
 151                                         usr = Find(u);
 152                                         if (usr)
 153                                         {
 154                                                 usr->dns_done = true;
 155                                         }
 156                                         return true;
 157                                 }
 158                         }
 159                         return false;
 160                 }
 161                 else
 162                 {
 163                         // doing reverse lookup
 164                         userrec* usr = NULL;
 165                         if (resolver1.HasResult(fdcheck))
 166                         {
 167                                 usr = Find(u);
 168                                 if ((usr) && (usr->dns_done))
 169                                 {
 170                                         if (resolver1.GetFD() != -1)
 171                                                 dnslist[resolver1.GetFD()] = NULL;
 172                                         return true;
 173                                 }
 174                                 if (resolver1.GetFD() != -1)
 175                                 {
 176                                         dnslist[resolver1.GetFD()] = NULL;
 177                                         hostname = resolver1.GetResult();
 178                                         if (usr)
 179                                         {
 180                                                 if ((usr->registered > 3) || (hostname == ""))
 181                                                 {
 182                                                         WriteServ(usr->fd,"NOTICE Auth :*** Could not resolve your hostname -- Using your IP address instead");
 183                                                         usr->dns_done = true;
 184                                                         return true;
 185                                                 }
 186                                         }
 187                                         if (hostname != "")
 188                                         {
 189                                                 resolver2.ForwardLookup(hostname);
 190                                                 if (resolver2.GetFD() != -1)
 191                                                         dnslist[resolver2.GetFD()] = this;
 192                                         }
 193                                 }
 194                         }
 195                 }
 196                 return false;
 197         }
 198
 199         int GetFD()
 200         {
 201                 userrec* usr = Find(u);
 202                 if (!usr)
 203                         return 0;
 204                 if (usr->dns_done)
 205                         return 0;
 206                 return usr->fd;
 207         }
 208 };
 209
 210 bool lookup_dns(std::string nick)
 211 {
 212         /* First attempt to find the nickname */
 213         userrec* u = Find(nick);
 214         if (u)
 215         {
 216                 /* Check the cache */
 217                 /*address_cache::iterator address = addrcache.find(u->ip4);
 218                 if (address != addrcache.end())
 219                 {
 220                         WriteServ(u->fd,"NOTICE Auth :*** Found your hostname (cached)");
 221                         log(DEBUG,"Found cached host");
 222                         strlcpy(u->host,address->second->c_str(),MAXBUF);
 223                         strlcpy(u->dhost,address->second->c_str(),MAXBUF);
 224                         u->dns_done = true;
 225                         return true;
 226                 }*/
 227                 /* If the user exists, create a new
 228                  * lookup object, and associate it
 229                  * with the user. The lookup object
 230                  * will maintain the reference table
 231                  * which we use for quickly finding
 232                  * dns results. Please note that we
 233                  * do not associate a lookup with a
 234                  * userrec* pointer and we use the
 235                  * nickname instead because, by the
 236                  * time the DNS lookup has completed,
 237                  * the nickname could have quit and
 238                  * if we then try and access the
 239                  * pointer we get a nice segfault.
 240                  */
 241                 Lookup* L = new Lookup();
 242                 L->DoLookup(nick);
 243                 return true;
 244         }
 245         return false;
 246 }
 247
 248 void dns_poll(int fdcheck)
 249 {
 250         /* Check the given file descriptor is in valid range */
 251         if ((fdcheck < 0) || (fdcheck > MAX_DESCRIPTORS))
 252                 return;
 253
 254         /* Try and find the file descriptor in our list of
 255          * active DNS lookups
 256          */
 257         Lookup *x = dnslist[fdcheck];
 258         if (x)
 259         {
 260                 /* If it exists check if its a valid fd still */
 261                 if (x->GetFD() != -1)
 262                 {
 263                         /* Check if its done, if it is delete it */
 264                         if (x->Done(fdcheck))
 265                         {
 266                                 /* We don't need to delete the file descriptor
 267                                  * from the socket engine, as dns.cpp tracks it
 268                                  * for us if we are in single-threaded country.
 269                                  */
 270                                 delete x;
 271                         }
 272                 }
 273                 else
 274                 {
 275                         /* its fd is dodgy, the dns code probably
 276                          * bashed it due to error. Free the class.
 277                          */
 278                         delete x;
 279                 }
 280                 /* If we got down here, the dns lookup was valid, BUT,
 281                  * its still in progress. Be patient, and wait for
 282                  * more socketengine events to complete the lookups.
 283                  */
 284                 return;
 285         }
 286         /* This FD doesnt belong here, lets be rid of it,
 287          * just to be safe so we dont get any more events
 288          * about it.
 289          */
 290         if (ServerInstance && ServerInstance->SE)
 291                 ServerInstance->SE->DelFd(fdcheck);
 292 }
 293