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