src/hello/address.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2009 Christian Grothoff (and other contributing authors)
   4
   5      GNUnet is free software; you can redistribute it and/or modify
   6      it under the terms of the GNU General Public License as published
   7      by the Free Software Foundation; either version 3, or (at your
   8      option) any later version.
   9
  10      GNUnet is distributed in the hope that it will be useful, but
  11      WITHOUT ANY WARRANTY; without even the implied warranty of
  12      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13      General Public License for more details.
  14
  15      You should have received a copy of the GNU General Public License
  16      along with GNUnet; see the file COPYING.  If not, write to the
  17      Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18      Boston, MA 02111-1307, USA.
  19 */
  20
  21 /**
  22  * @file hello/address.c
  23  * @brief helper functions for handling addresses
  24  * @author Christian Grothoff
  25  */
  26 #include "platform.h"
  27 #include "gnunet_hello_lib.h"
  28 #include "gnunet_util_lib.h"
  29
  30
  31 /**
  32  * Get the size of an address struct.
  33  *
  34  * @param address address
  35  * @return the size
  36  */
  37 size_t
  38 GNUNET_HELLO_address_get_size (const struct GNUNET_HELLO_Address * address)
  39 {
  40   return sizeof (struct GNUNET_HELLO_Address) + address->address_length +
  41         strlen (address->transport_name) + 1;
  42 }
  43
  44
  45 /**
  46  * Allocate an address struct.
  47  *
  48  * @param peer the peer
  49  * @param transport_name plugin name
  50  * @param address binary address
  51  * @param address_length number of bytes in 'address'
  52  * @return the address struct
  53  */
  54 struct GNUNET_HELLO_Address *
  55 GNUNET_HELLO_address_allocate (const struct GNUNET_PeerIdentity *peer,
  56                                const char *transport_name, const void *address,
  57                                size_t address_length,
  58                                enum GNUNET_HELLO_AddressInfo local_info)
  59 {
  60   struct GNUNET_HELLO_Address *addr;
  61   size_t slen;
  62   char *end;
  63
  64   GNUNET_assert (transport_name != NULL);
  65
  66   slen = strlen (transport_name) + 1;
  67   addr =
  68       GNUNET_malloc (sizeof (struct GNUNET_HELLO_Address) + address_length +
  69                      slen);
  70   addr->peer = *peer;
  71   addr->address = &addr[1];
  72   end = (char *) &addr[1];
  73   memcpy (end, address, address_length);
  74   addr->address_length = address_length;
  75   addr->transport_name = &end[address_length];
  76   memcpy (&end[address_length], transport_name, slen);
  77   return addr;
  78 }
  79
  80
  81 /**
  82  * Copy an address struct.
  83  *
  84  * @param address address to copy
  85  * @return a copy of the address struct
  86  */
  87 struct GNUNET_HELLO_Address *
  88 GNUNET_HELLO_address_copy (const struct GNUNET_HELLO_Address *address)
  89 {
  90   return GNUNET_HELLO_address_allocate (&address->peer, address->transport_name,
  91                                         address->address,
  92                                         address->address_length, 0);
  93 }
  94
  95
  96 /**
  97  * Compare two addresses.  Does NOT compare the peer identity,
  98  * that is assumed already to match!
  99  *
 100  * @param a1 first address
 101  * @param a2 second address
 102  * @return 0 if the addresses are equal, -1 if a1<a2, 1 if a1>a2.
 103  */
 104 int
 105 GNUNET_HELLO_address_cmp (const struct GNUNET_HELLO_Address *a1,
 106                           const struct GNUNET_HELLO_Address *a2)
 107 {
 108   int ret;
 109
 110   ret = strcmp (a1->transport_name, a2->transport_name);
 111   if (0 != ret)
 112     return ret;
 113   if (a1->address_length < a2->address_length)
 114     return -1;
 115   if (a1->address_length > a2->address_length)
 116     return 1;
 117   return memcmp (a1->address, a2->address, a1->address_length);
 118 }
 119
 120
 121 /* end of address.c */