main/ip_base.h

   1 /*
   2  * $Source: /cvs/cvsroot/d2x/main/ip_base.h,v $
   3  * $Revision: 1.1 $
   4  * $Author: bradleyb $
   5  * $Date: 2002-02-06 09:22:41 $
   6  *
   7  * ip_base.h - base for NAT-compatible udp/ip code.
   8  * added 2000/02/07 Matt Mueller
   9  *
  10  * $Log: not supported by cvs2svn $
  11  *
  12  */
  13
  14 #ifndef ___IP_BASE_H
  15 #define ___IP_BASE_H
  16
  17 #include <map.h>
  18 #include <list.h>
  19 #include <algo.h>
  20 extern "C" {
  21 #include "ip_basec.h"
  22 #include "fix.h"
  23 #include "mono.h"
  24 #include "vers_id.h"
  25 //#include "inetc.h"
  26 #include "timer.h"
  27 }
  28
  29 class ip_addr;//prototype for arch_ip_queryhost
  30
  31 #include "ipclient.h"
  32 #include <stdio.h>
  33
  34
  35 //inline u_int32_t d_rand32(void) { return d_rand() + (d_rand()<<16);}
  36 inline u_int32_t d_rand32(void) { return d_rand() + (d_rand()<<15) + (d_rand()<<30);}//d_rand() only returns 15 bits
  37
  38
  39 void ip_receive_cfg(ubyte *buf,int buflen,ip_addr fromaddr);
  40
  41 extern unsigned char ipx_MyAddress[10];
  42
  43 unsigned short ip_portshift(unsigned short baseport, const char *cs);
  44
  45 #define UDP_BASEPORT 31017
  46 #define UDP_SERV_BASEPORT 30817
  47 #define PORTSHIFT_TOLERANCE 0x100
  48 #define MAX_PACKETSIZE 8192
  49
  50 // Length HAS TO BE 2!
  51 #define D1Xid "\xd1x"
  52 // Length HAS TO BE 4!
  53 #define D1Xcfgid "\xcfg\xd1x"
  54
  55
  56 //cfg packet types
  57 #define IP_CFG_BASE 0
  58 #define IP_CFG_HANDSHAKE 1
  59 #define IP_CFG_RELAY 2
  60 //someone giving us an error (ie, outdated version, etc.) ... not handled yet.
  61 #define IP_CFG_SORRY 3
  62
  63
  64 #define STATE_INEEDINFO         1<<0
  65 #define STATE_SENDINGINFO       1<<1
  66 //#define STATE_NEED_RESEND     (STATE_INEEDINFO | STATE_SENDINGINFO)
  67 #define STATE_NEED_RESEND       (STATE_INEEDINFO)
  68 #define STATE_VALID_STATES      (STATE_INEEDINFO | STATE_SENDINGINFO)
  69 #define STATE_RELAYREPLY        1<<6
  70 #define STATE_ERR                       1<<7
  71 /* Dump raw form of IP address/port by fancy output to user
  72  */
  73
  74 #ifdef UDPDEBUG
  75 #include <stdio.h>
  76 inline char *ip_hs_statetoa(int state){
  77         if (!state)
  78                 return "NOSTATE";
  79         if (state&STATE_ERR)
  80                 return "ERR";
  81         if ((state&(STATE_INEEDINFO|STATE_SENDINGINFO))==(STATE_INEEDINFO|STATE_SENDINGINFO))
  82                 return "NEED+SEND";
  83         if (state&STATE_INEEDINFO)
  84                 return "NEED";
  85         if (state&STATE_SENDINGINFO)
  86                 return "SEND";
  87         return "huh?";
  88 }
  89 inline void dumprid(const unsigned char *a)
  90 {
  91     printf("<%u.%u.%u.%u.%u.%u>",a[0],a[1],a[2],a[3],a[4],a[5]);
  92 }
  93 inline void dumpraddr(const unsigned char *addr)
  94 {
  95         ushort port;
  96         printf("[%u.%u.%u.%u]",addr[0],addr[1],addr[2],addr[3]);
  97         port=(unsigned short)ntohs(*(unsigned short *)(addr+4));
  98         printf(":%d",port);
  99 }
 100 #endif
 101
 102
 103 class ip_id {
 104         public:
 105                 ubyte id[6];
 106
 107                 int fillbuf(ubyte *buf)const {memcpy(buf,id,6);return 6;};
 108                 int readbuf(const ubyte *buf){memcpy(id,buf,6);return 6;};
 109                 bool operator < (const ip_id &a_id)const {return memcmp(id,a_id.id,6)<0;}
 110                 bool operator == (const ip_id &a_id)const {return memcmp(id,a_id.id,6)==0;}
 111                 bool operator > (const ip_id &a_id)const {return memcmp(id,a_id.id,6)>0;}
 112                 ip_id& operator = (const ip_id &a_id){readbuf(a_id.id);return *this;}
 113 #ifdef UDPDEBUG
 114                 void dump(void){dumprid(id);}
 115 #endif
 116                 ip_id(ubyte*nid){readbuf(nid);}
 117                 ip_id(void){};
 118 };
 119
 120 class ip_addr {
 121         protected:
 122                 ubyte alen;//alen stuff is to maybe make ipv6 support easier (if the transition ever actually happens)
 123         public:
 124                 ubyte addr[6];
 125
 126                 int fillbuf(ubyte *buf)const {buf[0]=alen;memcpy(buf+1,addr,alen);return alen+1;};
 127                 int readbuf(const ubyte *buf){
 128                         int l=buf[0];
 129                         if (l==6){
 130                                 memcpy(addr,buf+1,6);alen=l;
 131                         }else{
 132                                 mprintf((0,"ip_addr readbuf bad len %i\n",l));
 133                                 memset(addr,0,6);alen=0;
 134                         }
 135                         return l+1;
 136                 };
 137                 bool operator < (const ip_addr &a_addr)const {
 138                         if (alen!=a_addr.alen) return alen<a_addr.alen;
 139                         return memcmp(addr,a_addr.addr,alen)<0;
 140                 }
 141                 bool operator == (const ip_addr &a_addr)const {return ((alen==a_addr.alen) && (memcmp(addr,a_addr.addr,alen)==0));}
 142                 bool operator > (const ip_addr &a_addr)const {
 143                         if (alen!=a_addr.alen) return alen>a_addr.alen;
 144                         return memcmp(addr,a_addr.addr,alen)>0;
 145                 }
 146                 ip_addr& operator = (const ip_addr &a_addr){alen=a_addr.alen;memcpy(addr,a_addr.addr,6);return *this;}
 147 #ifdef UDPDEBUG
 148                 void dump(void)const{dumpraddr(addr);}
 149 #endif
 150                 void set(int addrsize,ubyte *naddr,ushort port){
 151                         if (addrsize!=4)return;//not handled yet.
 152                         alen=addrsize+2;
 153                         memcpy(addr,naddr,addrsize);
 154 //                      port=htons(port);
 155                         memcpy(addr+addrsize,&port,2);
 156                 }
 157                 int dns(char *address,ushort baseport){
 158                         return arch_ip_queryhost(this,address,baseport);
 159                 }
 160                 bool ok(void)const{return alen>0;}
 161                 int addrlen(void)const{return alen-2;}
 162 //              ip_addr(ubyte*naddr){readbuf(naddr);}
 163                 ip_addr(void){alen=0;};
 164 };
 165
 166 class ip_addr_list {
 167         protected:
 168                 list<ip_addr> addrs;
 169         public:
 170                 typedef list<ip_addr>::iterator iterator;
 171                 typedef list<ip_addr>::const_iterator const_iterator;
 172                 int naddr;
 173                 ip_addr *goodaddr;
 174
 175                 iterator begin(void){return addrs.begin();}
 176                 iterator end(void){return addrs.end();}
 177                 const_iterator begin(void)const{return addrs.begin();}
 178                 const_iterator end(void)const{return addrs.end();}
 179                 bool hasaddr(ip_addr addr){
 180                         iterator i=find(begin(),end(),addr);
 181                         return (i!=addrs.end());
 182                 }
 183                 int add(ip_addr addr){
 184                         if (hasaddr(addr))
 185                                 return 0;
 186                         addrs.push_back(addr);
 187                         naddr++;
 188                         return 1;
 189                 }
 190                 int add(const ip_addr_list &na){
 191                         int j=0;
 192                         const_iterator i=na.begin();
 193                         for (;i!=na.end();++i)
 194                                 j+=add(*i);
 195                         return j;
 196                 }
 197                 void setgoodaddr(ip_addr addr){
 198                         iterator i=find(begin(),end(),addr);
 199                         if (i!=end()){
 200                                 goodaddr=&(*i);
 201                                 return;
 202                         }
 203                         addrs.push_back(addr);
 204                         goodaddr=&(*addrs.end());
 205                 }
 206                 int fillbuf(ubyte *buf)const {
 207                         int s=0;
 208                         const_iterator i;
 209                         buf[s++]=naddr;
 210                         for (i=begin();i!=end();++i)
 211                                 s+=(*i).fillbuf(buf+s);
 212                         return s;
 213                 }
 214                 int readbuf(const ubyte *buf){
 215                         int s=1,n;
 216                         ip_addr a;
 217                         for (n=buf[0];n;--n){
 218                                 s+=a.readbuf(buf+s);
 219 //                              addrs.push_back(a);
 220                                 if (a.ok())
 221                                         add(a);
 222                         }
 223                         return s;
 224                 }
 225                 void clear(void){
 226                         naddr=0;
 227                         goodaddr=NULL;
 228                         addrs.erase(begin(),end());
 229                 }
 230
 231                 ip_addr_list(const ip_addr_list &nl):addrs(nl.addrs),naddr(nl.naddr){setgoodaddr(*nl.goodaddr);}
 232                 ip_addr_list(void):naddr(0),goodaddr(NULL){}
 233 //              ip_addr_list(const ubyte * buf):naddr(0),goodaddr(NULL){readbuf(buf);}
 234 };
 235
 236 extern ip_addr_list ip_my_addrs;
 237
 238 extern int ip_sendtoca(ip_addr addr,const void *buf,int len);
 239
 240 class ip_handshake_base {
 241         public:
 242                 ubyte type;
 243                 ubyte state;
 244                 ip_id id;
 245                 u_int16_t iver;
 246                 u_int32_t tryid;
 247
 248                 fix nextsend;
 249                 int attempts;
 250                 int nopend;
 251
 252                 virtual int fillbuf(ubyte *buf);
 253                 virtual int readbuf(ubyte *buf);
 254                 void setrandid(void){tryid=d_rand32() ^ timer_get_approx_seconds();}
 255                 void setstate(int newstate);
 256                 int addstate(int newstate);
 257
 258 //              ip_handshake_base(void):type(IP_CFG_BASE){setstate(IPNOSTATE);}
 259                 ip_handshake_base(bool initme=0):type(IP_CFG_BASE){
 260                         nopend=0;
 261                         state=0;
 262                         setstate(0);
 263                         if(initme){
 264                 //              id=ip_my_id;
 265                                 id=ipx_MyAddress+4;
 266                                 iver=D2X_IVER;
 267                                 setrandid();
 268                         }
 269                 }
 270                 virtual ~ip_handshake_base(){setstate(0);}//decrement pendinghandshakes if needed.
 271 };
 272 class ip_handshake_info : public ip_handshake_base {
 273         public:
 274                 ip_addr_list addr;
 275
 276                 virtual int fillbuf(ubyte *buf);
 277                 virtual int readbuf(ubyte *buf);
 278
 279                 ip_handshake_info(ubyte *buf){
 280                         readbuf(buf);
 281                 }
 282                 ip_handshake_info(void):ip_handshake_base(1){
 283                         type=IP_CFG_HANDSHAKE;
 284                         addr=ip_my_addrs;
 285 //                      setstate(STATE_INEEDINFO);
 286                 }
 287 };
 288 class ip_peer;
 289 class ip_handshake_relay : public ip_handshake_base {
 290         public:
 291                 ip_id r_id;
 292                 u_int16_t r_iver;
 293                 ip_addr_list r_addr;
 294
 295                 virtual int fillbuf(ubyte *buf);
 296                 virtual int readbuf(ubyte *buf);
 297
 298                 ip_handshake_relay(ubyte *buf){
 299                         readbuf(buf);
 300                 }
 301                 ip_handshake_relay(ip_peer *torelay);
 302 };
 303
 304 //max number of times to try to handshake a host
 305 #define IP_MAX_HS_ATTEMPTS 10
 306 //how often to resend a hand-shake (3 seconds)
 307 #define IP_HS_RETRYTIME (F1_0*3)
 308 //how often (max) to search through the resend loop (1 second)
 309 #define IP_HS_FRAME_RETRYTIME (F1_0)
 310
 311 class ip_peer {
 312         public:
 313                 ip_addr_list addr;
 314 //              int goodaddr;
 315                 ip_id id;
 316                 int iver;
 317 //              ip_hs_state query;
 318 //              ip_hs_state reply;
 319                 list<ip_handshake_base*> handshakes;
 320
 321 //              void set_good_addr(ubyte *fraddr);
 322                 void add_hs(ip_handshake_base* hs){
 323 //                      mprintf((0,"########## add_hs %p: adding a hs %p %i %i\n",this,hs,hs->type,hs->state));
 324                         handshakes.push_back(hs);
 325                 }
 326                 ip_handshake_relay* find_relay(ip_id r_id){
 327                         list<ip_handshake_base*>::iterator i;
 328                         ip_handshake_base* hsb;
 329                         ip_handshake_relay* hsr;
 330                         for (i=handshakes.begin();i!=handshakes.end();++i){
 331                                 hsb=(*i);
 332                                 if (hsb->type==IP_CFG_RELAY){
 333                                         hsr=(ip_handshake_relay*)hsb;
 334                                         if (hsr->r_id==r_id)
 335                                                 return hsr;
 336                                 }
 337                         }
 338                         return NULL;
 339                 }
 340                 ip_handshake_info* find_handshake(void){
 341                         list<ip_handshake_base*>::iterator i;
 342                         ip_handshake_base* hsb;
 343                         for (i=handshakes.begin();i!=handshakes.end();++i){
 344                                 hsb=(*i);
 345                                 if (hsb->type==IP_CFG_HANDSHAKE)
 346                                         return (ip_handshake_info*) hsb;
 347                         }
 348                         ip_handshake_info *ni=new ip_handshake_info();
 349 //                      handshakes.push_back(ni);
 350                         add_hs(ni);
 351                         return ni;
 352                 }
 353 /*              ip_handshake_base* find_hs(u_int32_t tryid, ubyte type){
 354                         list<ip_handshake_base*>::iterator i;
 355                         ip_handshake_base* hsb;
 356                         for (i=handshakes.begin();i!=handshakes.end();++i){
 357                                 hsb=(*i);
 358                                 if (hsb->tryid==tryid && hsb->type==type)
 359                                         return hsb;
 360                         }
 361                         return NULL;
 362                 }*/
 363                 void send_handshake(ip_handshake_base*hsb);
 364                 bool verify_addr(ip_addr_list &fraddrs);
 365                 ip_peer(void){iver=0;}
 366                 ~ip_peer(){
 367                         list<ip_handshake_base*>::iterator i;
 368                         for (i=handshakes.begin();i!=handshakes.end();++i){
 369 /*                              mprintf((0,"###### ~ip_peer %p: deleting a hs %p %i %i\n",this,(*i),(*i)->type,(*i)->state));
 370                                 if (!(*i))
 371                                         mprintf((0,"~ip_peer null hs?\n"));
 372                                 else*/
 373                                         delete (*i);
 374                         }
 375                 }
 376 };
 377
 378
 379 class ip_peer_list {
 380         public:
 381                 typedef map<ip_id,ip_peer *,less<ip_id> > peer_map;
 382                 peer_map peers;
 383                 list<ip_peer*> unknown_peers;
 384                 int pendinghandshakes;
 385                 fix pendinghandshake_lasttime;
 386
 387                 ip_peer * add_id(ip_id id){
 388                         ip_peer*n=new ip_peer();
 389                         n->id=id;
 390                         peers.insert(peer_map::value_type(n->id,n));
 391                         return n;
 392                 }
 393                 ip_peer * add_unk(void){
 394                         ip_peer*n=new ip_peer();
 395                         unknown_peers.push_back(n);
 396                         return n;
 397                 }
 398                 //ip_peer * add_1(ubyte *addr,ip_id id);
 399                 ip_peer * add_1(ip_addr addr);
 400                 ip_peer * add_full(ip_id id, u_int16_t iver, ip_addr_list &addrs);
 401                 void make_full(ip_peer*p,ip_id id, u_int16_t iver, ip_addr_list &addrs);
 402                 ip_peer * add_hsi(ip_handshake_info *hsi){return add_full(hsi->id,hsi->iver,hsi->addr);}
 403                 ip_peer * find_byid(ip_id id);
 404                 ip_peer * find_by_addr(ip_addr addr);
 405                 ip_peer * find_unk_by_addr(ip_addr addr);
 406                 void handshake_frame(void);
 407                 void clear(void);
 408                 ip_peer_list(){
 409                         pendinghandshakes=0;
 410                         pendinghandshake_lasttime=0;
 411                 }
 412                 ~ip_peer_list();
 413 };
 414 extern ip_peer_list peer_list;
 415
 416 #endif