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author | Christian Grothoff <christian@grothoff.org> | 2019-01-26 20:49:59 +0100 |
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committer | Christian Grothoff <christian@grothoff.org> | 2019-01-26 20:49:59 +0100 |
commit | 7fc78674a6d3f2edb41e32cea59200908d0b344b (patch) | |
tree | b99608184fa08dcc6cd3e297369cb2761a03524f /src/cadet/cadet_api_list_peers.c | |
parent | a5a54c51011a9498e72b2a9341b35333c6beef1a (diff) | |
download | gnunet-7fc78674a6d3f2edb41e32cea59200908d0b344b.tar.gz gnunet-7fc78674a6d3f2edb41e32cea59200908d0b344b.zip |
starting with #5385 in earnest
Diffstat (limited to 'src/cadet/cadet_api_list_peers.c')
-rw-r--r-- | src/cadet/cadet_api_list_peers.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/cadet/cadet_api_list_peers.c b/src/cadet/cadet_api_list_peers.c new file mode 100644 index 000000000..4bdc8b961 --- /dev/null +++ b/src/cadet/cadet_api_list_peers.c | |||
@@ -0,0 +1,179 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | Copyright (C) 2011, 2017 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 | SPDX-License-Identifier: AGPL3.0-or-later | ||
19 | */ | ||
20 | /** | ||
21 | * @file cadet/cadet_api.c | ||
22 | * @brief cadet api: client implementation of cadet service | ||
23 | * @author Bartlomiej Polot | ||
24 | * @author Christian Grothoff | ||
25 | */ | ||
26 | #include "platform.h" | ||
27 | #include "gnunet_util_lib.h" | ||
28 | #include "gnunet_constants.h" | ||
29 | #include "gnunet_cadet_service.h" | ||
30 | #include "cadet.h" | ||
31 | #include "cadet_protocol.h" | ||
32 | |||
33 | |||
34 | |||
35 | /** | ||
36 | * Ugly legacy hack. | ||
37 | */ | ||
38 | struct GNUNET_CADET_PeersLister | ||
39 | { | ||
40 | |||
41 | /** | ||
42 | * Monitor callback | ||
43 | */ | ||
44 | GNUNET_CADET_PeersCB peers_cb; | ||
45 | |||
46 | /** | ||
47 | * Info callback closure for @c info_cb. | ||
48 | */ | ||
49 | void *peers_cb_cls; | ||
50 | }; | ||
51 | |||
52 | |||
53 | /** | ||
54 | * Send message of @a type to CADET service of @a h | ||
55 | * | ||
56 | * @param h handle to CADET service | ||
57 | * @param type message type of trivial information request to send | ||
58 | */ | ||
59 | static void | ||
60 | send_info_request (struct GNUNET_CADET_Handle *h, | ||
61 | uint16_t type) | ||
62 | { | ||
63 | struct GNUNET_MessageHeader *msg; | ||
64 | struct GNUNET_MQ_Envelope *env; | ||
65 | |||
66 | env = GNUNET_MQ_msg (msg, | ||
67 | type); | ||
68 | GNUNET_MQ_send (h->mq, | ||
69 | env); | ||
70 | } | ||
71 | |||
72 | |||
73 | /** | ||
74 | * Request information about peers known to the running cadet service. | ||
75 | * The callback will be called for every peer known to the service. | ||
76 | * Only one info request (of any kind) can be active at once. | ||
77 | * | ||
78 | * WARNING: unstable API, likely to change in the future! | ||
79 | * | ||
80 | * @param h Handle to the cadet peer. | ||
81 | * @param callback Function to call with the requested data. | ||
82 | * @param callback_cls Closure for @c callback. | ||
83 | * @return #GNUNET_OK / #GNUNET_SYSERR | ||
84 | */ | ||
85 | int | ||
86 | GNUNET_CADET_list_peers (struct GNUNET_CADET_Handle *h, | ||
87 | GNUNET_CADET_PeersCB callback, | ||
88 | void *callback_cls) | ||
89 | { | ||
90 | if (NULL != h->info_cb.peers_cb) | ||
91 | { | ||
92 | GNUNET_break (0); | ||
93 | return GNUNET_SYSERR; | ||
94 | } | ||
95 | send_info_request (h, | ||
96 | GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS); | ||
97 | h->info_cb.peers_cb = callback; | ||
98 | h->info_cls = callback_cls; | ||
99 | return GNUNET_OK; | ||
100 | } | ||
101 | |||
102 | |||
103 | /** | ||
104 | * Cancel a peer info request. The callback will not be called (anymore). | ||
105 | * | ||
106 | * WARNING: unstable API, likely to change in the future! | ||
107 | * | ||
108 | * @param h Cadet handle. | ||
109 | * @return Closure given to GNUNET_CADET_get_peers(). | ||
110 | */ | ||
111 | void * | ||
112 | GNUNET_CADET_list_peers_cancel (struct GNUNET_CADET_Handle *h) | ||
113 | { | ||
114 | void *cls = h->info_cls; | ||
115 | |||
116 | h->info_cb.peers_cb = NULL; | ||
117 | h->info_cls = NULL; | ||
118 | return cls; | ||
119 | } | ||
120 | |||
121 | |||
122 | /** | ||
123 | * Check that message received from CADET service is well-formed. | ||
124 | * | ||
125 | * @param cls the `struct GNUNET_CADET_Handle` | ||
126 | * @param message the message we got | ||
127 | * @return #GNUNET_OK if the message is well-formed, | ||
128 | * #GNUNET_SYSERR otherwise | ||
129 | */ | ||
130 | static int | ||
131 | check_get_peers (void *cls, | ||
132 | const struct GNUNET_MessageHeader *message) | ||
133 | { | ||
134 | size_t esize; | ||
135 | |||
136 | (void) cls; | ||
137 | esize = ntohs (message->size); | ||
138 | if (sizeof (struct GNUNET_CADET_LocalInfoPeer) == esize) | ||
139 | return GNUNET_OK; | ||
140 | if (sizeof (struct GNUNET_MessageHeader) == esize) | ||
141 | return GNUNET_OK; | ||
142 | return GNUNET_SYSERR; | ||
143 | } | ||
144 | |||
145 | |||
146 | /** | ||
147 | * Process a local reply about info on all tunnels, pass info to the user. | ||
148 | * | ||
149 | * @param cls Closure (Cadet handle). | ||
150 | * @param msg Message itself. | ||
151 | */ | ||
152 | static void | ||
153 | handle_get_peers (void *cls, | ||
154 | const struct GNUNET_MessageHeader *msg) | ||
155 | { | ||
156 | struct GNUNET_CADET_Handle *h = cls; | ||
157 | const struct GNUNET_CADET_LocalInfoPeer *info = | ||
158 | (const struct GNUNET_CADET_LocalInfoPeer *) msg; | ||
159 | |||
160 | if (NULL == h->info_cb.peers_cb) | ||
161 | return; | ||
162 | if (sizeof (struct GNUNET_CADET_LocalInfoPeer) == ntohs (msg->size)) | ||
163 | h->info_cb.peers_cb (h->info_cls, | ||
164 | &info->destination, | ||
165 | (int) ntohs (info->tunnel), | ||
166 | (unsigned int) ntohs (info->paths), | ||
167 | 0); | ||
168 | else | ||
169 | h->info_cb.peers_cb (h->info_cls, | ||
170 | NULL, | ||
171 | 0, | ||
172 | 0, | ||
173 | 0); | ||
174 | } | ||
175 | |||
176 | |||
177 | |||
178 | |||
179 | |||