-implementing ICMP PT and generation if ICMP payloads on EXIT->TUN link (for both...
[oweals/gnunet.git] / 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  * Allocate an address struct.
33  *
34  * @param peer the peer
35  * @param transport_name plugin name
36  * @param address binary address
37  * @param address_length number of bytes in 'address'
38  * @return the address struct
39  */
40 struct GNUNET_HELLO_Address *
41 GNUNET_HELLO_address_allocate (const struct GNUNET_PeerIdentity *peer,
42                                const char *transport_name, const void *address,
43                                size_t address_length)
44 {
45   struct GNUNET_HELLO_Address *addr;
46   size_t slen;
47   char *end;
48
49   slen = strlen (transport_name) + 1;
50   addr =
51       GNUNET_malloc (sizeof (struct GNUNET_HELLO_Address) + address_length +
52                      slen);
53   addr->peer = *peer;
54   addr->address = &addr[1];
55   end = (char *) &addr[1];
56   memcpy (end, address, address_length);
57   addr->address_length = address_length;
58   addr->transport_name = &end[address_length];
59   memcpy (&end[address_length], transport_name, slen);
60   return addr;
61 }
62
63
64 /**
65  * Get the size of an address struct.
66  *
67  * @param address address
68  * @return the size
69  */
70 size_t
71 GNUNET_HELLO_address_get_size (const struct GNUNET_HELLO_Address * address)
72 {
73   return sizeof (struct GNUNET_HELLO_Address) + address->address_length +
74       strlen (address->transport_name) + 1;
75 }
76
77
78 /**
79  * Copy an address struct.
80  *
81  * @param address address to copy
82  * @return a copy of the address struct
83  */
84 struct GNUNET_HELLO_Address *
85 GNUNET_HELLO_address_copy (const struct GNUNET_HELLO_Address *address)
86 {
87   return GNUNET_HELLO_address_allocate (&address->peer, address->transport_name,
88                                         address->address,
89                                         address->address_length);
90 }
91
92
93 /**
94  * Compare two addresses.  Does NOT compare the peer identity,
95  * that is assumed already to match!
96  *
97  * @param a1 first address
98  * @param a2 second address
99  * @return 0 if the addresses are equal, -1 if a1<a2, 1 if a1>a2.
100  */
101 int
102 GNUNET_HELLO_address_cmp (const struct GNUNET_HELLO_Address *a1,
103                           const struct GNUNET_HELLO_Address *a2)
104 {
105   int ret;
106
107   ret = strcmp (a1->transport_name, a2->transport_name);
108   if (0 != ret)
109     return ret;
110   if (a1->address_length < a2->address_length)
111     return -1;
112   if (a1->address_length > a2->address_length)
113     return 1;
114   return memcmp (a1->address, a1->address, a1->address_length);
115 }
116
117
118 /* end of address.c */