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 extern time_t TIME;
 168
 169 class Lookup {
 170 private:
 171         DNS* resolver;
 172         char u[NICKMAX];
 173 public:
 174         Lookup()
 175         {
 176                 strcpy(u,"");
 177                 resolver = NULL;
 178         }
 179
 180         void Reset()
 181         {
 182                 strcpy(u,"");
 183                 if (resolver)
 184                         delete resolver;
 185                 resolver = NULL;
 186         }
 187
 188         ~Lookup()
 189         {
 190                 if (resolver)
 191                         delete resolver;
 192                 resolver = NULL;
 193         }
 194
 195         bool DoLookup(std::string nick)
 196         {
 197                 userrec* usr = Find(nick);
 198                 if (usr)
 199                 {
 200                         log(DEBUG,"New Lookup class for %s with DNSServer set to '%s'",nick.c_str(),DNSServer);
 201                         resolver = new DNS(std::string(DNSServer));
 202                         if (!resolver->ReverseLookup(std::string(usr->host)))
 203                                 return false;
 204                         strlcpy(u,nick.c_str(),NICKMAX);
 205                         return true;
 206                 }
 207                 return false;
 208         }
 209
 210         bool Done()
 211         {
 212                 userrec* usr = NULL;
 213                 if (resolver->HasResult())
 214                 {
 215                         if (resolver->GetFD() != 0)
 216                         {
 217                                 std::string hostname = resolver->GetResult();
 218                                 usr = Find(u);
 219                                 if (usr)
 220                                 {
 221                                         if (usr->registered > 3)
 222                                         {
 223                                                 usr->dns_done = true;
 224                                                 return true;
 225                                         }
 226                                         if ((hostname != "") && (usr->registered != 7))
 227                                         {
 228                                                 strlcpy(usr->host,hostname.c_str(),MAXBUF);
 229                                                 strlcpy(usr->dhost,hostname.c_str(),MAXBUF);
 230                                                 WriteServ(usr->fd,"NOTICE Auth :Resolved your hostname: %s",hostname.c_str());
 231                                                 usr->dns_done = true;
 232                                                 return true;
 233                                         }
 234                                         usr->dns_done = true;
 235                                         return true;
 236                                 }
 237                         }
 238                         else
 239                         {
 240                                 usr = Find(u);
 241                                 if (usr)
 242                                         usr->dns_done = true;
 243                                 return true;
 244                         }
 245                 }
 246                 return false;
 247         }
 248
 249         int GetFD()
 250         {
 251                 userrec* usr = Find(u);
 252                 if (!usr)
 253                         return 0;
 254                 if (usr->dns_done)
 255                         return 0;
 256                 return usr->fd;
 257         }
 258 };
 259
 260 Lookup dnsq[MAXBUF];
 261
 262 bool lookup_dns(std::string nick)
 263 {
 264         userrec* u = Find(nick);
 265         if (u)
 266         {
 267                 // place a new user into the queue...
 268                 log(DEBUG,"Queueing DNS lookup for %s",u->nick);
 269                 WriteServ(u->fd,"NOTICE Auth :Looking up your hostname...");
 270                 Lookup L;
 271                 if (L.DoLookup(nick))
 272                 {
 273                         for (int j = 0; j < MAXBUF; j++)
 274                         {
 275                                 if (!dnsq[j].GetFD())
 276                                 {
 277                                         dnsq[j] = L;
 278                                         return true;
 279                                 }
 280                         }
 281                         // calculate the maximum value, this saves cpu time later
 282                         for (int p = 0; p < MAXBUF; p++)
 283                                 if (dnsq[p].GetFD())
 284                                         max_fd_alloc = p;
 285                 }
 286                 else
 287                 {
 288                         return false;
 289                 }
 290         }
 291         return false;
 292 }
 293
 294 void dns_poll()
 295 {
 296         // do we have items in the queue?
 297         for (int j = 0; j <= max_fd_alloc; j++)
 298         {
 299                 // are any ready, or stale?
 300                 if (dnsq[j].GetFD())
 301                 {
 302                         if (dnsq[j].Done())
 303                         {
 304                                 dnsq[j].Reset();
 305                         }
 306                 }
 307         }
 308         // looks like someones freed an item, recalculate end of list.
 309         if ((!dnsq[max_fd_alloc].GetFD()) && (max_fd_alloc != 0))
 310                 for (int p = 0; p < MAXBUF; p++)
 311                         if (dnsq[p].GetFD())
 312                                 max_fd_alloc = p;
 313
 314 }
 315