diff options
Diffstat (limited to 'src/dht/gnunet-service-dht_hello.c')
-rw-r--r-- | src/dht/gnunet-service-dht_hello.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/src/dht/gnunet-service-dht_hello.c b/src/dht/gnunet-service-dht_hello.c new file mode 100644 index 000000000..2ee60c91f --- /dev/null +++ b/src/dht/gnunet-service-dht_hello.c | |||
@@ -0,0 +1,139 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | (C) 2011 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 dht/gnunet-service-dht_hello.c | ||
23 | * @brief GNUnet DHT integration with peerinfo | ||
24 | * @author Christian Grothoff | ||
25 | * | ||
26 | * TODO: | ||
27 | * - consider adding mechanism to remove expired HELLOs | ||
28 | */ | ||
29 | #include "platform.h" | ||
30 | #include "gnunet-service-dht.h" | ||
31 | #include "gnunet-service-dht_hello.h" | ||
32 | #include "gnunet_peerinfo_service.h" | ||
33 | |||
34 | |||
35 | /** | ||
36 | * Handle for peerinfo notifications. | ||
37 | */ | ||
38 | static struct GNUNET_PEERINFO_NotifyContext *pnc; | ||
39 | |||
40 | /** | ||
41 | * Hash map of peers to HELLOs. | ||
42 | */ | ||
43 | static struct GNUNET_CONTAINER_MultiHashMap *peer_to_hello; | ||
44 | |||
45 | |||
46 | /** | ||
47 | * Obtain a peer's HELLO if available | ||
48 | * | ||
49 | * @param peer peer to look for a HELLO from | ||
50 | * @return HELLO for the given peer | ||
51 | */ | ||
52 | const struct GNUNET_HELLO_Message * | ||
53 | GDS_HELLO_get (const struct GNUNET_PeerIdentity *peer) | ||
54 | { | ||
55 | return GNUNET_CONTAINER_multihashmap_get (peer_to_hello, | ||
56 | &peer->hashPubKey); | ||
57 | } | ||
58 | |||
59 | |||
60 | /** | ||
61 | * Function called for each HELLO known to PEERINFO. | ||
62 | * | ||
63 | * @param cls closure | ||
64 | * @param peer id of the peer, NULL for last call | ||
65 | * @param hello hello message for the peer (can be NULL) | ||
66 | * @param error message | ||
67 | */ | ||
68 | static void | ||
69 | process_hello (void *cls, | ||
70 | const struct GNUNET_PeerIdentity * | ||
71 | peer, | ||
72 | const struct GNUNET_HELLO_Message * | ||
73 | hello, const char *err_msg) | ||
74 | { | ||
75 | struct GNUNET_TIME_Absolute ex; | ||
76 | struct GNUNET_HELLO_Message *hm; | ||
77 | |||
78 | if (hello == NULL) | ||
79 | return; | ||
80 | ex = GNUNET_HELLO_get_last_expiration (hello); | ||
81 | if (GNUNET_TIME_absolute_get_remaining (ex).rel_value == 0) | ||
82 | return; | ||
83 | hm = GNUNET_CONTAINER_multihashmap_get (peer_to_hello, | ||
84 | &peer->hashPubKey); | ||
85 | GNUNET_free_non_null (hm); | ||
86 | hm = GNUNET_malloc (GNUNET_HELLO_size (hello)); | ||
87 | memcpy (hm, hello, GNUNET_HELLO_size (hello)); | ||
88 | GNUNET_assert (GNUNET_SYSERR != | ||
89 | GNUNET_CONTAINER_multihashmap_put (peer_to_hello, | ||
90 | &peer->hashPubKey, | ||
91 | hm, | ||
92 | GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE)); | ||
93 | } | ||
94 | |||
95 | |||
96 | /** | ||
97 | * Initialize HELLO subsystem. | ||
98 | */ | ||
99 | void | ||
100 | GDS_HELLO_init () | ||
101 | { | ||
102 | pnc = GNUNET_PEERINFO_notify (GDS_cfg, | ||
103 | &process_hello, | ||
104 | NULL); | ||
105 | peer_to_hello = GNUNET_CONTAINER_multihashmap_create (256); | ||
106 | } | ||
107 | |||
108 | |||
109 | /** | ||
110 | * Free memory occopied by the HELLO. | ||
111 | */ | ||
112 | static int | ||
113 | free_hello (void *cls, | ||
114 | const GNUNET_HashCode *key, | ||
115 | void *hello) | ||
116 | { | ||
117 | GNUNET_free (hello); | ||
118 | return GNUNET_OK; | ||
119 | } | ||
120 | |||
121 | |||
122 | /** | ||
123 | * Shutdown HELLO subsystem. | ||
124 | */ | ||
125 | void | ||
126 | GDS_HELLO_done () | ||
127 | { | ||
128 | if (NULL != pnc) | ||
129 | { | ||
130 | GNUNET_PEERINFO_notify_cancel (pnc); | ||
131 | pnc = NULL; | ||
132 | } | ||
133 | GNUNET_CONTAINER_multihashmap_iterate (peer_to_hello, | ||
134 | &free_hello, | ||
135 | NULL); | ||
136 | GNUNET_CONTAINER_multihashmap_destroy (peer_to_hello); | ||
137 | } | ||
138 | |||
139 | /* end of gnunet-service-dht_hello.c */ | ||