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Diffstat (limited to 'src/messenger/plugin_gnsrecord_messenger.c')
-rw-r--r-- | src/messenger/plugin_gnsrecord_messenger.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/src/messenger/plugin_gnsrecord_messenger.c b/src/messenger/plugin_gnsrecord_messenger.c new file mode 100644 index 000000000..2219f0bde --- /dev/null +++ b/src/messenger/plugin_gnsrecord_messenger.c | |||
@@ -0,0 +1,243 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | Copyright (C) 2021 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 | * @author Tobias Frisch | ||
22 | * @file src/messenger/plugin_gnsrecord_messenger.c | ||
23 | * @brief Plugin to provide the API for useful GNS records to improve | ||
24 | * the usability of the messenger service. | ||
25 | */ | ||
26 | |||
27 | #include "platform.h" | ||
28 | #include "gnunet_util_lib.h" | ||
29 | #include "gnunet_gnsrecord_lib.h" | ||
30 | #include "gnunet_messenger_service.h" | ||
31 | #include "gnunet_gnsrecord_plugin.h" | ||
32 | |||
33 | |||
34 | /** | ||
35 | * Convert the 'value' of a record to a string. | ||
36 | * | ||
37 | * @param cls closure, unused | ||
38 | * @param type type of the record | ||
39 | * @param data value in binary encoding | ||
40 | * @param data_size number of bytes in @a data | ||
41 | * @return NULL on error, otherwise human-readable representation of the value | ||
42 | */ | ||
43 | static char * | ||
44 | messenger_value_to_string (void *cls, | ||
45 | uint32_t type, | ||
46 | const void *data, | ||
47 | size_t data_size) | ||
48 | { | ||
49 | (void) cls; | ||
50 | switch (type) | ||
51 | { | ||
52 | case GNUNET_GNSRECORD_TYPE_MESSENGER_ROOM_ENTRY: | ||
53 | { | ||
54 | if (data_size != sizeof(struct GNUNET_MESSENGER_RoomEntryRecord)) | ||
55 | { | ||
56 | GNUNET_break_op (0); | ||
57 | return NULL; | ||
58 | } | ||
59 | |||
60 | const struct GNUNET_MESSENGER_RoomEntryRecord *record = data; | ||
61 | |||
62 | char *door = GNUNET_CRYPTO_eddsa_public_key_to_string (&(record->door.public_key)); | ||
63 | char *key = GNUNET_STRINGS_data_to_string_alloc (&(record->key), sizeof(struct GNUNET_HashCode)); | ||
64 | |||
65 | char *ret; | ||
66 | GNUNET_asprintf (&ret, "%s-%s", door, key); | ||
67 | GNUNET_free (key); | ||
68 | GNUNET_free (door); | ||
69 | return ret; | ||
70 | } | ||
71 | |||
72 | default: | ||
73 | return NULL; | ||
74 | } | ||
75 | } | ||
76 | |||
77 | |||
78 | /** | ||
79 | * Convert human-readable version of a 'value' of a record to the binary | ||
80 | * representation. | ||
81 | * | ||
82 | * @param cls closure, unused | ||
83 | * @param type type of the record | ||
84 | * @param s human-readable string | ||
85 | * @param data set to value in binary encoding (will be allocated) | ||
86 | * @param data_size set to number of bytes in @a data | ||
87 | * @return #GNUNET_OK on success | ||
88 | */ | ||
89 | static int | ||
90 | messenger_string_to_value (void *cls, | ||
91 | uint32_t type, | ||
92 | const char *s, | ||
93 | void **data, | ||
94 | size_t *data_size) | ||
95 | { | ||
96 | (void) cls; | ||
97 | if (NULL == s) | ||
98 | { | ||
99 | GNUNET_break (0); | ||
100 | return GNUNET_SYSERR; | ||
101 | } | ||
102 | |||
103 | switch (type) | ||
104 | { | ||
105 | case GNUNET_GNSRECORD_TYPE_MESSENGER_ROOM_ENTRY: | ||
106 | { | ||
107 | char key [103]; | ||
108 | const char *dash; | ||
109 | struct GNUNET_PeerIdentity door; | ||
110 | |||
111 | if ((NULL == (dash = strchr (s, '-'))) || | ||
112 | (1 != sscanf (s, "%103s-", key)) || | ||
113 | (GNUNET_OK != GNUNET_CRYPTO_eddsa_public_key_from_string (dash + 1, | ||
114 | strlen (dash + 1), | ||
115 | &(door.public_key)))) | ||
116 | { | ||
117 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
118 | _ ("Unable to parse MESSENGER_ROOM_ENTRY record `%s'\n"), | ||
119 | s); | ||
120 | return GNUNET_SYSERR; | ||
121 | } | ||
122 | |||
123 | struct GNUNET_MESSENGER_RoomEntryRecord *record = GNUNET_new ( | ||
124 | struct GNUNET_MESSENGER_RoomEntryRecord | ||
125 | ); | ||
126 | |||
127 | if (GNUNET_OK != GNUNET_STRINGS_string_to_data (key, | ||
128 | strlen (key), | ||
129 | &(record->key), | ||
130 | sizeof(struct GNUNET_HashCode))) | ||
131 | { | ||
132 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
133 | _ ("Unable to parse MESSENGER_ROOM_ENTRY record `%s'\n"), | ||
134 | s); | ||
135 | GNUNET_free (record); | ||
136 | return GNUNET_SYSERR; | ||
137 | } | ||
138 | |||
139 | record->door = door; | ||
140 | *data = record; | ||
141 | *data_size = sizeof(struct GNUNET_MESSENGER_RoomEntryRecord); | ||
142 | return GNUNET_OK; | ||
143 | } | ||
144 | |||
145 | default: | ||
146 | return GNUNET_SYSERR; | ||
147 | } | ||
148 | } | ||
149 | |||
150 | |||
151 | /** | ||
152 | * Mapping of record type numbers to human-readable | ||
153 | * record type names. | ||
154 | */ | ||
155 | static struct | ||
156 | { | ||
157 | const char *name; | ||
158 | uint32_t number; | ||
159 | } name_map[] = { | ||
160 | { "MESSENGER_ROOM_ENTRY", GNUNET_GNSRECORD_TYPE_MESSENGER_ROOM_ENTRY }, | ||
161 | { NULL, UINT32_MAX } | ||
162 | }; | ||
163 | |||
164 | |||
165 | /** | ||
166 | * Convert a type name (e.g. "AAAA") to the corresponding number. | ||
167 | * | ||
168 | * @param cls closure, unused | ||
169 | * @param gns_typename name to convert | ||
170 | * @return corresponding number, UINT32_MAX on error | ||
171 | */ | ||
172 | static uint32_t | ||
173 | messenger_typename_to_number (void *cls, | ||
174 | const char *gns_typename) | ||
175 | { | ||
176 | unsigned int i; | ||
177 | |||
178 | (void) cls; | ||
179 | i = 0; | ||
180 | while ((name_map[i].name != NULL) && | ||
181 | (0 != strcasecmp (gns_typename, name_map[i].name))) | ||
182 | i++; | ||
183 | return name_map[i].number; | ||
184 | } | ||
185 | |||
186 | |||
187 | /** | ||
188 | * Convert a type number to the corresponding type string (e.g. 1 to "A") | ||
189 | * | ||
190 | * @param cls closure, unused | ||
191 | * @param type number of a type to convert | ||
192 | * @return corresponding typestring, NULL on error | ||
193 | */ | ||
194 | static const char * | ||
195 | messenger_number_to_typename (void *cls, | ||
196 | uint32_t type) | ||
197 | { | ||
198 | unsigned int i; | ||
199 | |||
200 | (void) cls; | ||
201 | i = 0; | ||
202 | while ((name_map[i].name != NULL) && | ||
203 | (type != name_map[i].number)) | ||
204 | i++; | ||
205 | return name_map[i].name; | ||
206 | } | ||
207 | |||
208 | |||
209 | /** | ||
210 | * Entry point for the plugin. | ||
211 | * | ||
212 | * @param cls NULL | ||
213 | * @return the exported block API | ||
214 | */ | ||
215 | void * | ||
216 | libgnunet_plugin_gnsrecord_messenger_init (void *cls) | ||
217 | { | ||
218 | struct GNUNET_GNSRECORD_PluginFunctions *api; | ||
219 | |||
220 | (void) cls; | ||
221 | api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions); | ||
222 | api->value_to_string = &messenger_value_to_string; | ||
223 | api->string_to_value = &messenger_string_to_value; | ||
224 | api->typename_to_number = &messenger_typename_to_number; | ||
225 | api->number_to_typename = &messenger_number_to_typename; | ||
226 | return api; | ||
227 | } | ||
228 | |||
229 | |||
230 | /** | ||
231 | * Exit point from the plugin. | ||
232 | * | ||
233 | * @param cls the return value from #libgnunet_plugin_block_test_init | ||
234 | * @return NULL | ||
235 | */ | ||
236 | void * | ||
237 | libgnunet_plugin_gnsrecord_messenger_done (void *cls) | ||
238 | { | ||
239 | struct GNUNET_GNSRECORD_PluginFunctions *api = cls; | ||
240 | |||
241 | GNUNET_free (api); | ||
242 | return NULL; | ||
243 | } | ||