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.h"
  22 #include "inspircd_io.h"
  23 #include "inspircd_util.h"
  24 #include "inspircd_config.h"
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <sys/errno.h>
  28 #include <sys/ioctl.h>
  29 #include <sys/utsname.h>
  30 #include <cstdio>
  31 #include <time.h>
  32 #include <string>
  33 #ifdef GCC3
  34 #include <ext/hash_map>
  35 #else
  36 #include <hash_map>
  37 #endif
  38 #include <map>
  39 #include <sstream>
  40 #include <vector>
  41 #include <errno.h>
  42 #include <deque>
  43 #include <errno.h>
  44 #include <unistd.h>
  45 #include <sched.h>
  46 #include "connection.h"
  47 #include "users.h"
  48 #include "servers.h"
  49 #include "ctables.h"
  50 #include "globals.h"
  51 #include "modules.h"
  52 #include "dynamic.h"
  53 #include "wildcard.h"
  54 #include "message.h"
  55 #include "mode.h"
  56 #include "commands.h"
  57 #include "xline.h"
  58 #include "inspstring.h"
  59 #include "dnsqueue.h"
  60 #include <stdlib.h>
  61 #include <time.h>
  62 #include <sys/types.h>
  63 #include <sys/socket.h>
  64 #include <sys/poll.h>
  65 #include <sys/time.h>
  66 #include <netinet/in.h>
  67 #include <string.h>
  68 #include <unistd.h>
  69 #include <stdio.h>
  70 #include <errno.h>
  71 #include <fcntl.h>
  72 #include "dns.h"
  73
  74 #ifdef GCC3
  75 #define nspace __gnu_cxx
  76 #else
  77 #define nspace std
  78 #endif
  79
  80 extern int MaxWhoResults;
  81
  82 extern std::vector<Module*> modules;
  83 extern std::vector<std::string> module_names;
  84 extern std::vector<ircd_module*> factory;
  85 extern std::vector<int> fd_reap;
  86
  87 extern int MODCOUNT;
  88
  89 namespace nspace
  90 {
  91 #ifdef GCC34
  92         template<> struct hash<in_addr>
  93 #else
  94         template<> struct nspace::hash<in_addr>
  95 #endif
  96         {
  97                 size_t operator()(const struct in_addr &a) const
  98                 {
  99                         size_t q;
 100                         memcpy(&q,&a,sizeof(size_t));
 101                         return q;
 102                 }
 103         };
 104 #ifdef GCC34
 105         template<> struct hash<string>
 106 #else
 107         template<> struct nspace::hash<string>
 108 #endif
 109         {
 110                 size_t operator()(const string &s) const
 111                 {
 112                         char a[MAXBUF];
 113                         static struct hash<const char *> strhash;
 114                         strlcpy(a,s.c_str(),MAXBUF);
 115                         strlower(a);
 116                         return strhash(a);
 117                 }
 118         };
 119 }
 120
 121
 122 struct StrHashComp
 123 {
 124
 125         bool operator()(const string& s1, const string& s2) const
 126         {
 127                 char a[MAXBUF],b[MAXBUF];
 128                 strlcpy(a,s1.c_str(),MAXBUF);
 129                 strlcpy(b,s2.c_str(),MAXBUF);
 130                 return (strcasecmp(a,b) == 0);
 131         }
 132
 133 };
 134
 135 struct InAddr_HashComp
 136 {
 137
 138         bool operator()(const in_addr &s1, const in_addr &s2) const
 139         {
 140                 size_t q;
 141                 size_t p;
 142
 143                 memcpy(&q,&s1,sizeof(size_t));
 144                 memcpy(&p,&s2,sizeof(size_t));
 145
 146                 return (q == p);
 147         }
 148
 149 };
 150
 151
 152 typedef nspace::hash_map<std::string, userrec*, nspace::hash<string>, StrHashComp> user_hash;
 153 typedef nspace::hash_map<std::string, chanrec*, nspace::hash<string>, StrHashComp> chan_hash;
 154 typedef nspace::hash_map<in_addr,string*, nspace::hash<in_addr>, InAddr_HashComp> address_cache;
 155 typedef std::deque<command_t> command_table;
 156
 157 extern user_hash clientlist;
 158 extern chan_hash chanlist;
 159 extern user_hash whowas;
 160 extern command_table cmdlist;
 161
 162 extern ClassVector Classes;
 163
 164 extern char DNSServer[MAXBUF];
 165 long max_fd_alloc = 0;
 166
 167 class Lookup {
 168 private:
 169         DNS* resolver;
 170         char u[NICKMAX];
 171 public:
 172         Lookup()
 173         {
 174                 strcpy(u,"");
 175                 resolver = NULL;
 176         }
 177
 178         void Reset()
 179         {
 180                 strcpy(u,"");
 181                 if (resolver)
 182                         delete resolver;
 183                 resolver = NULL;
 184         }
 185
 186         ~Lookup()
 187         {
 188                 if (resolver)
 189                         delete resolver;
 190         }
 191
 192         bool DoLookup(std::string nick)
 193         {
 194                 userrec* usr = Find(nick);
 195                 if (usr)
 196                 {
 197                         log(DEBUG,"New Lookup class for %s with DNSServer set to '%s'",nick.c_str(),DNSServer);
 198                         resolver = new DNS(std::string(DNSServer));
 199                         if (!resolver->ReverseLookup(std::string(usr->host)))
 200                                 return false;
 201                         strlcpy(u,nick.c_str(),NICKMAX);
 202                         return true;
 203                 }
 204                 return false;
 205         }
 206
 207         bool Done()
 208         {
 209                 userrec* usr = NULL;
 210                 if (resolver->HasResult())
 211                 {
 212                         if (resolver->GetFD() != 0)
 213                         {
 214                                 std::string hostname = resolver->GetResult();
 215                                 usr = Find(u);
 216                                 if (usr)
 217                                 {
 218                                         if (usr->registered > 3)
 219                                         {
 220                                                 usr->dns_done = true;
 221                                                 return true;
 222                                         }
 223                                         if ((hostname != "") && (usr->registered != 7))
 224                                         {
 225                                                 strlcpy(usr->host,hostname.c_str(),MAXBUF);
 226                                                 WriteServ(usr->fd,"NOTICE Auth :Resolved your hostname: %s",hostname.c_str());
 227                                                 usr->dns_done = true;
 228                                                 return true;
 229                                         }
 230                                         usr->dns_done = true;
 231                                         return true;
 232                                 }
 233                         }
 234                         else
 235                         {
 236                                 usr = Find(u);
 237                                 if (usr)
 238                                         usr->dns_done = true;
 239                                 return true;
 240                         }
 241                 }
 242                 return false;
 243         }
 244
 245         int GetFD()
 246         {
 247                 userrec* usr = Find(u);
 248                 if (!usr)
 249                         return 0;
 250                 if (usr->dns_done)
 251                         return 0;
 252                 return usr->fd;
 253         }
 254 };
 255
 256 Lookup dnsq[MAXBUF];
 257
 258 bool lookup_dns(std::string nick)
 259 {
 260         userrec* u = Find(nick);
 261         if (u)
 262         {
 263                 // place a new user into the queue...
 264                 log(DEBUG,"Queueing DNS lookup for %s",u->nick);
 265                 WriteServ(u->fd,"NOTICE Auth :Looking up your hostname...");
 266                 Lookup L;
 267                 if (L.DoLookup(nick))
 268                 {
 269                         for (int j = 0; j < MAXBUF; j++)
 270                         {
 271                                 if (!dnsq[j].GetFD())
 272                                 {
 273                                         dnsq[j] = L;
 274                                         return true;
 275                                 }
 276                         }
 277                         // calculate the maximum value, this saves cpu time later
 278                         for (int p = 0; p < MAXBUF; p++)
 279                                 if (dnsq[p].GetFD())
 280                                         max_fd_alloc = p;
 281                 }
 282                 else
 283                 {
 284                         return false;
 285                 }
 286         }
 287         return false;
 288 }
 289
 290 void dns_poll()
 291 {
 292         // do we have items in the queue?
 293         for (int j = 0; j <= max_fd_alloc; j++)
 294         {
 295                 // are any ready, or stale?
 296                 if (dnsq[j].GetFD())
 297                 {
 298                         if (dnsq[j].Done())
 299                         {
 300                                 dnsq[j].Reset();
 301                         }
 302                 }
 303         }
 304         // looks like someones freed an item, recalculate end of list.
 305         if ((!dnsq[max_fd_alloc].GetFD()) && (max_fd_alloc != 0))
 306                 for (int p = 0; p < MAXBUF; p++)
 307                         if (dnsq[p].GetFD())
 308                                 max_fd_alloc = p;
 309
 310 }
 311