src/hello/address.c

   1 /*
   2      This file is part of GNUnet.
   3      Copyright (C) 2009 GNUnet e.V.
   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., 51 Franklin Street, Fifth Floor,
  18      Boston, MA 02110-1301, 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  * Check if an address has a local option set
  33  *
  34  * @param address the address to check
  35  * @param option the respective option to check for
  36  * @return #GNUNET_YES or #GNUNET_NO
  37  */
  38 int
  39 GNUNET_HELLO_address_check_option (const struct GNUNET_HELLO_Address * address,
  40                                    enum GNUNET_HELLO_AddressInfo option)
  41 {
  42   if (option == (address->local_info & option))
  43     return GNUNET_YES;
  44   return GNUNET_NO;
  45 }
  46
  47
  48 /**
  49  * Get the size of an address struct.
  50  *
  51  * @param address address
  52  * @return the size
  53  */
  54 size_t
  55 GNUNET_HELLO_address_get_size (const struct GNUNET_HELLO_Address * address)
  56 {
  57   return sizeof (struct GNUNET_HELLO_Address) + address->address_length +
  58     strlen (address->transport_name) + 1;
  59 }
  60
  61
  62 /**
  63  * Allocate an address struct.
  64  *
  65  * @param peer the peer
  66  * @param transport_name plugin name
  67  * @param address binary address
  68  * @param address_length number of bytes in 'address'
  69  * @param local_info additional local information for the address
  70  * @return the address struct
  71  */
  72 struct GNUNET_HELLO_Address *
  73 GNUNET_HELLO_address_allocate (const struct GNUNET_PeerIdentity *peer,
  74                                const char *transport_name,
  75                                const void *address,
  76                                size_t address_length,
  77                                enum GNUNET_HELLO_AddressInfo local_info)
  78 {
  79   struct GNUNET_HELLO_Address *addr;
  80   size_t slen;
  81   char *end;
  82
  83   slen = strlen (transport_name) + 1;
  84   addr = GNUNET_malloc (sizeof (struct GNUNET_HELLO_Address) +
  85                         address_length + slen);
  86   addr->peer = *peer;
  87   addr->address = &addr[1];
  88   addr->address_length = address_length;
  89   addr->local_info = local_info;
  90   end = (char *) &addr[1];
  91   addr->transport_name = &end[address_length];
  92   GNUNET_memcpy (end,
  93           address,
  94           address_length);
  95   GNUNET_memcpy (&end[address_length],
  96           transport_name,
  97           slen);
  98   return addr;
  99 }
 100
 101
 102 /**
 103  * Copy an address struct.
 104  *
 105  * @param address address to copy
 106  * @return a copy of the address struct
 107  */
 108 struct GNUNET_HELLO_Address *
 109 GNUNET_HELLO_address_copy (const struct GNUNET_HELLO_Address *address)
 110 {
 111   if (NULL == address)
 112     return NULL;
 113   return GNUNET_HELLO_address_allocate (&address->peer,
 114                                         address->transport_name,
 115                                         address->address,
 116                                         address->address_length,
 117                                         address->local_info);
 118 }
 119
 120
 121 /**
 122  * Compare two addresses.  Does NOT compare the peer identity,
 123  * that is assumed already to match!
 124  *
 125  * @param a1 first address
 126  * @param a2 second address
 127  * @return 0 if the addresses are equal, -1 if a1<a2, 1 if a1>a2.
 128  */
 129 int
 130 GNUNET_HELLO_address_cmp (const struct GNUNET_HELLO_Address *a1,
 131                           const struct GNUNET_HELLO_Address *a2)
 132 {
 133   int ret;
 134
 135   if ( (NULL == a1) &&
 136        (NULL == a2) )
 137     return 0;
 138   if (NULL == a1)
 139     return 1;
 140   if (NULL == a2)
 141     return -1;
 142   ret = strcmp (a1->transport_name, a2->transport_name);
 143   if (0 != ret)
 144     return ret;
 145   if (a1->local_info != a2->local_info)
 146     return (((int) a1->local_info) < ((int) a2->local_info)) ? -1 : 1;
 147   if (a1->address_length < a2->address_length)
 148     return -1;
 149   if (a1->address_length > a2->address_length)
 150     return 1;
 151   return memcmp (a1->address,
 152                  a2->address,
 153                  a1->address_length);
 154 }
 155
 156
 157 /* end of address.c */