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 it
   6      under the terms of the GNU Affero General Public License as published
   7      by the Free Software Foundation, either version 3 of the License,
   8      or (at your 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      Affero General Public License for more details.
  14
  15      You should have received a copy of the GNU Affero General Public License
  16      along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 /**
  20  * @file hello/address.c
  21  * @brief helper functions for handling addresses
  22  * @author Christian Grothoff
  23  */
  24 #include "platform.h"
  25 #include "gnunet_hello_lib.h"
  26 #include "gnunet_util_lib.h"
  27
  28
  29 /**
  30  * Check if an address has a local option set
  31  *
  32  * @param address the address to check
  33  * @param option the respective option to check for
  34  * @return #GNUNET_YES or #GNUNET_NO
  35  */
  36 int
  37 GNUNET_HELLO_address_check_option (const struct GNUNET_HELLO_Address * address,
  38                                    enum GNUNET_HELLO_AddressInfo option)
  39 {
  40   if (option == (address->local_info & option))
  41     return GNUNET_YES;
  42   return GNUNET_NO;
  43 }
  44
  45
  46 /**
  47  * Get the size of an address struct.
  48  *
  49  * @param address address
  50  * @return the size
  51  */
  52 size_t
  53 GNUNET_HELLO_address_get_size (const struct GNUNET_HELLO_Address * address)
  54 {
  55   return sizeof (struct GNUNET_HELLO_Address) + address->address_length +
  56     strlen (address->transport_name) + 1;
  57 }
  58
  59
  60 /**
  61  * Allocate an address struct.
  62  *
  63  * @param peer the peer
  64  * @param transport_name plugin name
  65  * @param address binary address
  66  * @param address_length number of bytes in 'address'
  67  * @param local_info additional local information for the address
  68  * @return the address struct
  69  */
  70 struct GNUNET_HELLO_Address *
  71 GNUNET_HELLO_address_allocate (const struct GNUNET_PeerIdentity *peer,
  72                                const char *transport_name,
  73                                const void *address,
  74                                size_t address_length,
  75                                enum GNUNET_HELLO_AddressInfo local_info)
  76 {
  77   struct GNUNET_HELLO_Address *addr;
  78   size_t slen;
  79   char *end;
  80
  81   slen = strlen (transport_name) + 1;
  82   addr = GNUNET_malloc (sizeof (struct GNUNET_HELLO_Address) +
  83                         address_length + slen);
  84   addr->peer = *peer;
  85   addr->address = &addr[1];
  86   addr->address_length = address_length;
  87   addr->local_info = local_info;
  88   end = (char *) &addr[1];
  89   addr->transport_name = &end[address_length];
  90   GNUNET_memcpy (end,
  91           address,
  92           address_length);
  93   GNUNET_memcpy (&end[address_length],
  94           transport_name,
  95           slen);
  96   return addr;
  97 }
  98
  99
 100 /**
 101  * Copy an address struct.
 102  *
 103  * @param address address to copy
 104  * @return a copy of the address struct
 105  */
 106 struct GNUNET_HELLO_Address *
 107 GNUNET_HELLO_address_copy (const struct GNUNET_HELLO_Address *address)
 108 {
 109   if (NULL == address)
 110     return NULL;
 111   return GNUNET_HELLO_address_allocate (&address->peer,
 112                                         address->transport_name,
 113                                         address->address,
 114                                         address->address_length,
 115                                         address->local_info);
 116 }
 117
 118
 119 /**
 120  * Compare two addresses.  Does NOT compare the peer identity,
 121  * that is assumed already to match!
 122  *
 123  * @param a1 first address
 124  * @param a2 second address
 125  * @return 0 if the addresses are equal, -1 if a1<a2, 1 if a1>a2.
 126  */
 127 int
 128 GNUNET_HELLO_address_cmp (const struct GNUNET_HELLO_Address *a1,
 129                           const struct GNUNET_HELLO_Address *a2)
 130 {
 131   int ret;
 132
 133   if ( (NULL == a1) &&
 134        (NULL == a2) )
 135     return 0;
 136   if (NULL == a1)
 137     return 1;
 138   if (NULL == a2)
 139     return -1;
 140   ret = strcmp (a1->transport_name, a2->transport_name);
 141   if (0 != ret)
 142     return ret;
 143   if (a1->local_info != a2->local_info)
 144     return (((int) a1->local_info) < ((int) a2->local_info)) ? -1 : 1;
 145   if (a1->address_length < a2->address_length)
 146     return -1;
 147   if (a1->address_length > a2->address_length)
 148     return 1;
 149   return memcmp (a1->address,
 150                  a2->address,
 151                  a1->address_length);
 152 }
 153
 154
 155 /* end of address.c */