summaryrefslogtreecommitdiffstats
path: root/tdecore/network/ksocketaddress.h
blob: 6f7869323a96640e5c20284077ec800bf604eea5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
/*  -*- C++ -*-
 *  Copyright (C) 2003 Thiago Macieira <thiago.macieira@kdemail.net>
 *
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
 *  "Software"), to deal in the Software without restriction, including
 *  without limitation the rights to use, copy, modify, merge, publish,
 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so, subject to
 *  the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included 
 *  in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef KSOCKETADDRESS_H
#define KSOCKETADDRESS_H

#include <tqstring.h>
#include <tqcstring.h>

#include <kdelibs_export.h>

struct sockaddr;
struct sockaddr_in;
struct sockaddr_in6;
struct sockaddr_un;

namespace KNetwork {

class KIpAddress;
class KSocketAddress;
class KInetSocketAddress;
class KUnixSocketAddress;

/** @class KIpAddress ksocketaddress.h ksocketaddress.h
 *  @brief An IP address.
 *
 * This class represents one IP address, version 4 or 6. This is only
 * the address, not including port information or other data.
 *
 * It is not a good programming practice to create address from objects
 * like this. Instead, prefer a more thorough function like
 * @ref KResolver::resolve, which also handle extra information like scope
 * ids.
 *
 * This is a light-weight class. Most of the member functions are inlined and
 * there are no virtual functions. This object's size should be less than 20
 * bytes. Also note that there is no sharing of data.
 *
 * @author Thiago Macieira <thiago.macieira@kdemail.net>
 */
class TDECORE_EXPORT KIpAddress
{
public:
  /**
   * Default constructor. Creates an empty address.
   * It defaults to IP version 4.
   */
  inline KIpAddress() : m_version(0)
  { }

  /**
   * Copy constructor. Copies the data from the other
   * object.
   *
   * Data is not shared.
   *
   * @param other		the other
   */
  inline KIpAddress(const KIpAddress& other)
  { *this = other; }

  /**
   * Creates an object from the given string representation.
   *
   * The IP version is guessed from the address format.
   *
   * @param addr		the address
   */
  inline KIpAddress(const TQString& addr)
  { setAddress(addr); }

  /**
   * Creates an object from the given string representation.
   *
   * The IP version is guessed from the address format.
   *
   * @param addr		the address
   */
  inline KIpAddress(const char* addr)
  { setAddress(addr); }

  /**
   * Creates an object from the given raw data and IP version.
   *
   * @param addr		the raw data
   * @param version		the IP version (4 or 6)
   */
  inline KIpAddress(const void* addr, int version = 4)
  { setAddress(addr, version); }

  /**
   * This is a convenience constructor. Constructs an object
   * from the given IPv4 address in the form of an integer.
   *
   * Note: do not write code to depend on IPv4 addresses being
   * integer types. Instead, treat them as a special type, like
   * a KIpAddress or the system's in_addr.
   *
   * @param ip4addr		the IPv4 address
   */
  inline KIpAddress(TQ_UINT32 ip4addr)
  { setAddress(&ip4addr, 4); }

  /**
   * Destructor. This frees resources associated with this object.
   *
   * Note: destructor is non-virtual. The compiler will happily optimise it
   * out of the way.
   */
  inline ~KIpAddress()
  { }

  /**
   * Copy operator.
   *
   * Copies the data from the other object into this one.
   *
   * @param other		the object to copy
   */
  KIpAddress& operator =(const KIpAddress& other);

  /**
   * Returns true if the two addresses match.
   * This function performs a v4-mapped check.
   * @see compare
   */
  inline bool operator ==(const KIpAddress& other) const
  { return compare(other, true); }

  /**
   * Compares this address against the other, supplied one and return
   * true if they match. The @p checkMapped parameter controls whether
   * a check for an IPv6 v4-mapped address will be performed.
   *
   * An IPv6 v4-mapped address is an IPv6 address that is, for all purposes,
   * equivalent to an IPv4 one. The default behaviour of this function
   * is to take that into account. If you want a strict matching,
   * pass @b false to the @p checkMapped parameter.
   *
   * @param other	the other IP address
   * @param checkMapped	whether v4-mapped addresses will be taken into account
   */
  bool compare(const KIpAddress& other, bool checkMapped = true) const;

  /**
   * Retrieves the IP version in this object.
   *
   * @returns the version: 4 or 6
   */
  inline int version() const
  { return m_version; }

  /**
   * Returns true if this is an IPv4 address.
   */
  inline bool isIPv4Addr() const
  { return version() == 4; }

  /**
   * Returns true if this is an IPv6 address.
   */
  inline bool isIPv6Addr() const
  { return version() == 6; }

  /**
   * Sets the address to the given string representation.
   *
   * @return true if the address was successfully parsed; otherwise returns
   * false and leaves the object unchanged.
   */
  bool setAddress(const TQString& address);

  /**
   * Sets the address to the given string representation.
   *
   * @return true if the address was successfully parsed; otherwise returns
   * false and leaves the object unchanged.
   */
  bool setAddress(const char* address);

  /**
   * Sets the address to the given raw binary representation.
   *
   * @param raw			a pointer to the raw binary data
   * @param version		the IP version
   * @return true if the address was successfully parsed; otherwise returns
   * false and leaves the object unchanged.
   */
  bool setAddress(const void* raw, int version = 4);

  /**
   * Returns the address as a string.
   */
  TQString toString() const;

  /**
   * Returns a pointer to binary raw data representing the address.
   */
  inline const void *addr() const
  { return m_data; }

  /**
   * This is a convenience function. Returns the IPv4 address in a
   * 32-bit integer. The result is only valid if @ref isIPv4Addr returns
   * true. Alternatively, if the contained IPv6 address is a v4-mapped one
   * and the @p convertMapped parameter is true, the result will also be
   * valid. The address returned is in network byte order.
   *
   * Note: you should not treat IP addresses as integers. Instead,
   * use types defined for that purpose, such as KIpAddress or the
   * system's in_addr type.
   *
   */
  inline TQ_UINT32 IPv4Addr(bool convertMapped = true) const
  {
    return (convertMapped && isV4Mapped()) ? m_data[3] : m_data[0];
  }

  /**
   * This is a convenience function. Returns the IPv4 address in a
   * 32-bit integer. The result is only valid if @ref isIPv4Addr returns
   * true. Alternatively, if the contained IPv6 address is a v4-mapped one
   * and the @p convertMapped parameter is true, the result will also be
   * valid. The address returned is in host byte order.
   *
   */
  TQ_UINT32 hostIPv4Addr(bool convertMapped = true) const;

public:
  /*-- tests --*/

  /**
   * Returns true if this is the IPv4 or IPv6 unspecified address.
   */
  inline bool isUnspecified() const
  { return version() == 0 ? true : (*this == anyhostV4 || *this == anyhostV6); }

  /**
   *  Returns true if this is either the IPv4 or the IPv6 localhost address.
   */
  inline bool isLocalhost() const
  { return version() == 0 ? false : (*this == localhostV4 || *this == localhostV6); }

  /**
   * This is an alias for @ref isLocalhost.
   */
  inline bool isLoopback() const
  { return isLocalhost(); }

  /**
   * Returns true if this is an IPv4 class A address, i.e., 
   * from 0.0.0.0 to 127.255.255.255.
   *
   * This function does not test for v4-mapped addresses.
   */
  inline bool isClassA() const
  { return version() != 4 ? false : (hostIPv4Addr() & 0x80000000) == 0; }

  /**
   * Returns true if this is an IPv4 class B address, i.e., one from
   * 128.0.0.0 to 191.255.255.255.
   *
   * This function does not test for v4-mapped addresses.
   */
  inline bool isClassB() const
  { return version() != 4 ? false : (hostIPv4Addr() & 0xc0000000) == 0x80000000; }

  /**
   * Returns true if this is an IPv4 class C address, i.e., one from
   * 192.0.0.0 to 223.255.255.255.
   *
   * This function does not test for v4-mapped addresses.
   */
  inline bool isClassC() const
  { return version() != 4 ? false : (hostIPv4Addr() & 0xe0000000) == 0xc0000000; }

  /**
   * Returns true if this is an IPv4 class D (a.k.a. multicast) address.
   *
   * Note: this function is not the same as @ref isMulticast. isMulticast also
   * tests for IPv6 multicast addresses.
   */
  inline bool isClassD() const
  { return version() != 4 ? false : (hostIPv4Addr() & 0xf0000000) == 0xe0000000; }

  /**
   * Returns true if this is a multicast address, be it IPv4 or IPv6.
   */
  inline bool isMulticast() const
  {
    if (version() == 4) return isClassD();
    if (version() == 6) return ((TQ_UINT8*)addr())[0] == 0xff;
    return false;
  }

  /**
   * Returns true if this is an IPv6 link-local address.
   */
  inline bool isLinkLocal() const
  { 
    if (version() != 6) return false;
    TQ_UINT8* addr = (TQ_UINT8*)this->addr();
    return (addr[0] & 0xff) == 0xfe &&
      (addr[1] & 0xc0) == 0x80;
  }

  /**
   * Returns true if this is an IPv6 site-local address.
   */
  inline bool isSiteLocal() const
  {
    if (version() != 6) return false;
    TQ_UINT8* addr = (TQ_UINT8*)this->addr();
    return (addr[0] & 0xff) == 0xfe &&
      (addr[1] & 0xc0) == 0xc0;
  }

  /**
   * Returns true if this is a global IPv6 address.
   */
  inline bool isGlobal() const
  { return version() != 6 ? false : !(isMulticast() || isLinkLocal() || isSiteLocal()); }

  /**
   * Returns true if this is a v4-mapped IPv6 address.
   */
  inline bool isV4Mapped() const
  {
    if (version() != 6) return false;
    TQ_UINT32* addr = (TQ_UINT32*)this->addr();
    return addr[0] == 0 && addr[1] == 0 &&
      ((TQ_UINT16*)&addr[2])[0] == 0 &&
      ((TQ_UINT16*)&addr[2])[1] == 0xffff;
  }

  /**
   * Returns true if this is a v4-compat IPv6 address.
   */
  inline bool isV4Compat() const
  {
    if (version() != 6 || isLocalhost()) return false;
    TQ_UINT32* addr = (TQ_UINT32*)this->addr();
    return addr[0] == 0 && addr[1] == 0 && addr[2] == 0 && addr[3] != 0;
  }

  /**
   * Returns true if this is an IPv6 node-local multicast address.
   */
  inline bool isMulticastNodeLocal() const
  { return version() == 6 && isMulticast() && (((TQ_UINT32*)addr())[0] & 0xf) == 0x1; }

  /**
   * Returns true if this is an IPv6 link-local multicast address.
   */
  inline bool isMulticastLinkLocal() const
  { return version() == 6 && isMulticast() && (((TQ_UINT32*)addr())[0] & 0xf) == 0x2; }
      
  /**
   * Returns true if this is an IPv6 site-local multicast address.
   */
  inline bool isMulticastSiteLocal() const
  { return version() == 6 && isMulticast() && (((TQ_UINT32*)addr())[0] & 0xf) == 0x5; }

  /**
   * Returns true if this is an IPv6 organisational-local multicast address.
   */
  inline bool isMulticastOrgLocal() const
  { return version() == 6 && isMulticast() && (((TQ_UINT32*)addr())[0] & 0xf) == 0x8; }

  /**
   * Returns true if this is an IPv6 global multicast address.
   */
  inline bool isMulticastGlobal() const
  { return version() == 6 && isMulticast() && (((TQ_UINT32*)addr())[0] & 0xf) == 0xe; }

protected:
  TQ_UINT32 m_data[4];	       // 16 bytes, needed for an IPv6 address

  char m_version;

public:
  /// localhost in IPv4 (127.0.0.1)
  static const KIpAddress localhostV4;
  /// the any host or undefined address in IPv4 (0.0.0.0)
  static const KIpAddress anyhostV4;

  /// localhost in IPv6 (::1)
  static const KIpAddress localhostV6;
  /// the any host or undefined address in IPv6 (::)
  static const KIpAddress anyhostV6;
};


class KSocketAddressData;
/** @class KSocketAddress ksocketaddress.h ksocketaddress.h
 *  @brief A generic socket address.
 *
 * This class holds one generic socket address.
 *
 * @author Thiago Macieira <thiago.macieira@kdemail.net>
 */
class TDECORE_EXPORT KSocketAddress
{
public:
  /**
   * Default constructor.
   *
   * Creates an empty object
   */
  KSocketAddress();

  /**
   * Creates this object with the given data.
   * The raw socket address is copied into this object.
   *
   * @param sa		the socket address structure
   * @param len		the socket address length
   */
  KSocketAddress(const sockaddr* sa, TQ_UINT16 len);

  /**
   * Copy constructor. This creates a copy of the other
   * object.
   *
   * Data is not shared.
   *
   * @param other	the object to copy from
   */
  KSocketAddress(const KSocketAddress& other);

  /**
   * Destructor. Frees any associated resources.
   */
  virtual ~KSocketAddress();

  /**
   * Performs a shallow copy of the other object into this one.
   * Data will be copied.
   *
   * @param other	the object to copy from
   */
  KSocketAddress& operator =(const KSocketAddress& other);

  /**
   * Returns the socket address structure, to be passed down to
   * low level functions.
   *
   * Note that this function returns NULL for invalid or empty sockets,
   * so you may use to to test for validity.
   */
  const sockaddr* address() const;

  /**
   * Returns the socket address structure, to be passed down to
   * low level functions.
   *
   * Note that this function returns NULL for invalid or empty sockets,
   * so you may use to to test for validity.
   *
   * The returned value, if not NULL, is an internal buffer which is guaranteed
   * to be at least @ref length() bytes long.
   */
  sockaddr* address();

  /**
   * Sets the address to the given address.
   * The raw socket address is copied into this object.
   *
   * @param sa		the socket address structure
   * @param len		the socket address length
   */
  KSocketAddress& setAddress(const sockaddr *sa, TQ_UINT16 len);

  /**
   * Returns the socket address structure, to be passed down to
   * low level functions.
   */
  inline operator const sockaddr*() const
  { return address(); }

  /**
   * Returns the length of this socket address structure.
   */
  TQ_UINT16 length() const;

  /**
   * Sets the length of this socket structure.
   *
   * Use this function with care. It allows you to resize the internal
   * buffer to fit needs. This function should not be used except for handling
   * unknown socket address structures.
   *
   * Also note that this function may tqinvalidate the socket if a known
   * family is set (Internet or Unix socket) and the new length would be
   * too small to hold the system's sockaddr_* structure. If unsure, reset
   * the family:
   *
   * \code
   *   KSocketAddress qsa;
   *   [...]
   *   qsa.setFamily(AF_UNSPEC).setLength(newlen);
   * \endcode
   *
   * @param len		the new length
   */
  KSocketAddress& setLength(TQ_UINT16 len);

  /**
   * Returns the family of this address.
   * @return the family of this address, AF_UNSPEC if it's undefined
   */
  int family() const;

  /**
   * Sets the family of this object.
   *
   * Note: setting the family will probably tqinvalidate any address data
   * contained in this object. Use this function with care.
   *
   * @param family	the new family to set
   */
  virtual KSocketAddress& setFamily(int family);

  /**
   * Returns the IANA family number of this address.
   * @return the IANA family number of this address (1 for AF_INET.
   *         2 for AF_INET6, otherwise 0)
   */
  inline int ianaFamily() const
  { return ianaFamily(family()); }
  
  /**
   * Returns true if this equals the other socket.
   *
   * Socket addresses are considered matching if and only if all data is the same.
   *
   * @param other	the other socket
   * @return true if both sockets are equal
   */
  bool operator ==(const KSocketAddress& other) const;

  /**
   * Returns the node name of this socket.
   *
   * In the case of Internet sockets, this is string representation of the IP address.
   * The default implementation returns TQString::null.
   *
   * @return the node name, can be TQString::null
   * @bug use KResolver to resolve unknown families
   */
  virtual TQString nodeName() const;

  /**
   * Returns the service name for this socket.
   *
   * In the case of Internet sockets, this is the port number.
   * The default implementation returns TQString::null.
   *
   * @return the service name, can be TQString::null
   * @bug use KResolver to resolve unknown families
   */
  virtual TQString serviceName() const;

  /**
   * Returns this socket address as a string suitable for
   * printing. Family, node and service are part of this address.
   *
   * @bug use KResolver to resolve unknown families
   */
  virtual TQString toString() const;

  /**
   * Returns an object reference that can be used to manipulate this socket
   * as an Internet socket address. Both objects share the same data.
   */
  KInetSocketAddress& asInet();

  /**
   * Returns an object is equal to this object's data, but they don't share it.
   */
  KInetSocketAddress asInet() const;

  /**
   * Returns an object reference that can be used to manipulate this socket
   * as a Unix socket address. Both objects share the same data.
   */
  KUnixSocketAddress& asUnix();

  /**
   * Returns an object is equal to this object's data, but they don't share it.
   */
  KUnixSocketAddress asUnix() const;

protected:
  /// @internal
  /// private data
  KSocketAddressData *d;

  /// @internal
  /// extra constructor
  KSocketAddress(KSocketAddressData* d);

public:				// static
  /**
   * Returns the IANA family number of the given address family.
   * Returns 0 if there is no corresponding IANA family number.
   * @param af		the address family, in AF_* constants
   * @return the IANA family number of this address (1 for AF_INET.
   *         2 for AF_INET6, otherwise 0)
   */
  static int ianaFamily(int af);

  /**
   * Returns the address family of the given IANA family number.
   * @return the address family, AF_UNSPEC for unknown IANA family numbers
   */
  static int fromIanaFamily(int iana);
};


/** @class KInetSocketAddress ksocketaddress.h ksocketaddress.h
 *  @brief an Internet socket address
 *
 * An Inet (IPv4 or IPv6) socket address
 *
 * This is an IPv4 or IPv6 address of the Internet.
 *
 * @author Thiago Macieira <thiago.macieira@kdemail.net>
 */
class TDECORE_EXPORT KInetSocketAddress: public KSocketAddress
{
  friend class KSocketAddress;
public:
  /**
   * Public constructor. Creates an empty object.
   */
  KInetSocketAddress();

  /**
   * Creates an object from raw data.
   *
   * Note: if the socket address @p sa does not contain a valid Internet
   * socket (IPv4 or IPv6), this object will be empty.
   *
   * @param sa		the sockaddr structure
   * @param len		the structure's length
   */
  KInetSocketAddress(const sockaddr* sa, TQ_UINT16 len);

  /**
   * Creates an object from an IP address and port.
   *
   * @param host	the IP address
   * @param port	the port number
   */
  KInetSocketAddress(const KIpAddress& host, TQ_UINT16 port);

  /**
   * Copy constructor.
   *
   * Data is not shared.
   *
   * @param other	the other object
   */
  KInetSocketAddress(const KInetSocketAddress& other);

  /**
   * Copy constructor.
   *
   * If the other, generic socket address contains an Internet address,
   * it will be copied. Otherwise, this object will be empty.
   *
   * @param other	the other object
   */
  KInetSocketAddress(const KSocketAddress& other);

  /**
   * Destroys this object.
   */
  virtual ~KInetSocketAddress();

  /**
   * Copy operator.
   *
   * Copies the other object into this one.
   *
   * @param other	the other object
   */
  KInetSocketAddress& operator =(const KInetSocketAddress& other);

  /**
   * Cast operator to sockaddr_in.
   */
  inline operator const sockaddr_in*() const
  { return (const sockaddr_in*)address(); }

  /**
   * Cast operator to sockaddr_in6.
   */
  inline operator const sockaddr_in6*() const
  { return (const sockaddr_in6*)address(); }

  /**
   * Returns the IP version of the address this object holds.
   *
   * @return 4 or 6, if IPv4 or IPv6, respectively; 0 if this object is empty
   */
  int ipVersion() const;

  /**
   * Returns the IP address component.
   */
  KIpAddress ipAddress() const;

  /**
   * Sets the IP address to the given raw address.
   *
   * This call will preserve port numbers accross IP versions, but will lose
   * IPv6 specific data if the address is set to IPv4.
   *
   * @param addr	the address to set to
   * @return a reference to itself
   */
  KInetSocketAddress& setHost(const KIpAddress& addr);

  /**
   * Retrieves the port number stored in this object.
   *
   * @return a port number in the range 0 to 65535, inclusive. An empty or 
   * invalid object will have a port number of 0.
   */
  TQ_UINT16 port() const;

  /**
   * Sets the port number. If this object is empty, this function will default to
   * creating an IPv4 address.
   *
   * @param port	the port number to set
   * @return a reference to itself
   */
  KInetSocketAddress& setPort(TQ_UINT16 port);

  /**
   * Converts this object to an IPv4 socket address. It has no effect if the object
   * is already an IPv4 socket address.
   *
   * If this object is an IPv6 address, the port number is preserved. All other information
   * is lost.
   *
   * @return a reference to itself
   */
  KInetSocketAddress& makeIPv4();

  /**
   * Converts this object to an IPv6 socket address. It has no effect if the object
   * is already an IPv6 socket address.
   *
   * If this object is an IPv4 address, the port number is preserved.
   *
   * @return a reference to itself
   */
  KInetSocketAddress& makeIPv6();

  /**
   * Returns the flowinfo information from the IPv6 socket address.
   *
   * @return the flowinfo information or 0 if this object is empty or IPv4
   */
  TQ_UINT32 flowinfo() const;

  /**
   * Sets the flowinfo information for an IPv6 socket address. If this is not
   * an IPv6 socket address, this function converts it to one. See makeIPv6.
   *
   * @param flowinfo		the flowinfo to set
   * @return a reference to itself
   */
  KInetSocketAddress& setFlowinfo(TQ_UINT32 flowinfo);

  /**
   * Returns the scope id this IPv6 socket is bound to.
   *
   * @return the scope id, or 0 if this is not an IPv6 object
   */
  int scopeId() const;

  /**
   * Sets the scope id for this IPv6 object. If this is not an IPv6 socket
   * address, this function converts it to one. See makeIPv6
   *
   * @param scopeid		the scopeid to set
   * @return a reference to itself
   */
  KInetSocketAddress& setScopeId(int scopeid);

protected:
  /// @internal
  /// extra constructor
  KInetSocketAddress(KSocketAddressData* d);

private:
  void update();
};

/*
 * External definition
 */

/** @class KUnixSocketAddress ksocketaddress.h ksocketaddress.h
 *  @brief A Unix (local) socket address.
 *
 * This is a Unix socket address.
 *
 * Note that this class uses QStrings to represent filenames, which means
 * the proper encoding is used to translate into valid filesystem file names.
 *
 * @author Thiago Macieira <thiago.macieira@kdemail.net>
 */
class TDECORE_EXPORT KUnixSocketAddress: public KSocketAddress
{
  friend class KSocketAddress;
public:
  /**
   * Default constructor. Creates an empty object.
   */
  KUnixSocketAddress();

  /**
   * Creates this object with the given raw data. If
   * the sockaddr structure does not contain a Local namespace
   * (Unix) socket, this object will be created empty.
   *
   * @param sa		the socket address structure
   * @param len		the structure's length
   */
  KUnixSocketAddress(const sockaddr* sa, TQ_UINT16 len);

  /**
   * Copy constructor. Creates a copy of the other object,
   * sharing the data explicitly.
   *
   * @param other	the other object
   */
  KUnixSocketAddress(const KUnixSocketAddress& other);

  /**
   * Constructs an object from the given pathname.
   */
  KUnixSocketAddress(const TQString& pathname);

  /**
   * Destructor.
   */
  virtual ~KUnixSocketAddress();

  /**
   * Copy operator. Copies the contents of the other object into
   * this one. Data is explicitly shared.
   *
   * @param other		the other
   */
  KUnixSocketAddress& operator =(const KUnixSocketAddress& other);

  /**
   * Cast operator to sockaddr_un.
   */
  inline operator const sockaddr_un*() const
  { return (const sockaddr_un*)address(); }

  /**
   * Returns the pathname associated with this object. Will return
   * TQString::null if this object is empty.
   */
  TQString pathname() const;

  /**
   * Sets the pathname for the object.
   *
   * @return a reference to itself
   */
  KUnixSocketAddress& setPathname(const TQString& path);

protected:
  /// @internal
  /// extra constructor
  KUnixSocketAddress(KSocketAddressData* d);
};

}				// namespace KNetwork

#endif