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Diffstat (limited to 'src/regex/regex_api_announce.c')
-rw-r--r-- | src/regex/regex_api_announce.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/src/regex/regex_api_announce.c b/src/regex/regex_api_announce.c new file mode 100644 index 000000000..8953436a1 --- /dev/null +++ b/src/regex/regex_api_announce.c | |||
@@ -0,0 +1,186 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet | ||
3 | Copyright (C) 2012, 2013, 2016 GNUnet e.V. | ||
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., 51 Franklin Street, Fifth Floor, | ||
18 | Boston, MA 02110-1301, USA. | ||
19 | */ | ||
20 | /** | ||
21 | * @file regex/regex_api_announce.c | ||
22 | * @brief access regex service to advertise capabilities via regex | ||
23 | * @author Maximilian Szengel | ||
24 | * @author Christian Grothoff | ||
25 | */ | ||
26 | #include "platform.h" | ||
27 | #include "gnunet_protocols.h" | ||
28 | #include "gnunet_util_lib.h" | ||
29 | #include "gnunet_regex_service.h" | ||
30 | #include "regex_ipc.h" | ||
31 | |||
32 | #define LOG(kind,...) GNUNET_log_from (kind, "regex-api",__VA_ARGS__) | ||
33 | |||
34 | /** | ||
35 | * Handle to store cached data about a regex announce. | ||
36 | */ | ||
37 | struct GNUNET_REGEX_Announcement | ||
38 | { | ||
39 | /** | ||
40 | * Connection to the regex service. | ||
41 | */ | ||
42 | struct GNUNET_MQ_Handle *mq; | ||
43 | |||
44 | /** | ||
45 | * Our configuration. | ||
46 | */ | ||
47 | const struct GNUNET_CONFIGURATION_Handle *cfg; | ||
48 | |||
49 | /** | ||
50 | * Message we're sending to the service. | ||
51 | */ | ||
52 | char *regex; | ||
53 | |||
54 | /** | ||
55 | * Frequency of announcements. | ||
56 | */ | ||
57 | struct GNUNET_TIME_Relative refresh_delay; | ||
58 | |||
59 | /** | ||
60 | * Number of characters per edge. | ||
61 | */ | ||
62 | uint16_t compression; | ||
63 | }; | ||
64 | |||
65 | |||
66 | |||
67 | /** | ||
68 | * (Re)connect to the REGEX service with the given announcement @a a. | ||
69 | * | ||
70 | * @param a REGEX to announce. | ||
71 | */ | ||
72 | static void | ||
73 | announce_reconnect (struct GNUNET_REGEX_Announcement *a); | ||
74 | |||
75 | |||
76 | /** | ||
77 | * We got a disconnect after asking regex to do the announcement. | ||
78 | * Retry. | ||
79 | * | ||
80 | * @param cls the `struct GNUNET_REGEX_Announcement` to retry | ||
81 | * @param error error code | ||
82 | */ | ||
83 | static void | ||
84 | announce_mq_error_handler (void *cls, | ||
85 | enum GNUNET_MQ_Error error) | ||
86 | { | ||
87 | struct GNUNET_REGEX_Announcement *a = cls; | ||
88 | |||
89 | GNUNET_MQ_destroy (a->mq); | ||
90 | a->mq = NULL; | ||
91 | announce_reconnect (a); | ||
92 | } | ||
93 | |||
94 | |||
95 | /** | ||
96 | * (Re)connect to the REGEX service with the given announcement @a a. | ||
97 | * | ||
98 | * @param a REGEX to announce. | ||
99 | */ | ||
100 | static void | ||
101 | announce_reconnect (struct GNUNET_REGEX_Announcement *a) | ||
102 | { | ||
103 | struct GNUNET_MQ_Envelope *env; | ||
104 | struct AnnounceMessage *am; | ||
105 | size_t slen; | ||
106 | |||
107 | a->mq = GNUNET_CLIENT_connecT (a->cfg, | ||
108 | "regex", | ||
109 | NULL, | ||
110 | &announce_mq_error_handler, | ||
111 | a); | ||
112 | if (NULL == a->mq) | ||
113 | return; | ||
114 | slen = strlen (a->regex) + 1; | ||
115 | env = GNUNET_MQ_msg_extra (am, | ||
116 | slen, | ||
117 | GNUNET_MESSAGE_TYPE_REGEX_ANNOUNCE); | ||
118 | am->compression = htons (a->compression); | ||
119 | am->reserved = htons (0); | ||
120 | am->refresh_delay = GNUNET_TIME_relative_hton (a->refresh_delay); | ||
121 | memcpy (&am[1], | ||
122 | a->regex, | ||
123 | slen); | ||
124 | GNUNET_MQ_send (a->mq, | ||
125 | env); | ||
126 | } | ||
127 | |||
128 | |||
129 | /** | ||
130 | * Announce the given peer under the given regular expression. | ||
131 | * | ||
132 | * @param cfg configuration to use | ||
133 | * @param regex Regular expression to announce. | ||
134 | * @param refresh_delay after what delay should the announcement be repeated? | ||
135 | * @param compression How many characters per edge can we squeeze? | ||
136 | * @return Handle to reuse o free cached resources. | ||
137 | * Must be freed by calling #GNUNET_REGEX_announce_cancel(). | ||
138 | */ | ||
139 | struct GNUNET_REGEX_Announcement * | ||
140 | GNUNET_REGEX_announce (const struct GNUNET_CONFIGURATION_Handle *cfg, | ||
141 | const char *regex, | ||
142 | struct GNUNET_TIME_Relative refresh_delay, | ||
143 | uint16_t compression) | ||
144 | { | ||
145 | struct GNUNET_REGEX_Announcement *a; | ||
146 | size_t slen; | ||
147 | |||
148 | slen = strlen (regex) + 1; | ||
149 | if (slen + sizeof (struct AnnounceMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE) | ||
150 | { | ||
151 | GNUNET_log (GNUNET_ERROR_TYPE_WARNING, | ||
152 | _("Regex `%s' is too long!\n"), | ||
153 | regex); | ||
154 | GNUNET_break (0); | ||
155 | return NULL; | ||
156 | } | ||
157 | a = GNUNET_new (struct GNUNET_REGEX_Announcement); | ||
158 | a->cfg = cfg; | ||
159 | a->refresh_delay = refresh_delay; | ||
160 | a->compression = compression; | ||
161 | a->regex = GNUNET_strdup (regex); | ||
162 | announce_reconnect (a); | ||
163 | if (NULL == a->mq) | ||
164 | { | ||
165 | GNUNET_free (a->regex); | ||
166 | GNUNET_free (a); | ||
167 | return NULL; | ||
168 | } | ||
169 | return a; | ||
170 | } | ||
171 | |||
172 | |||
173 | /** | ||
174 | * Stop announcing the regex specified by the given handle. | ||
175 | * | ||
176 | * @param a handle returned by a previous #GNUNET_REGEX_announce() call. | ||
177 | */ | ||
178 | void | ||
179 | GNUNET_REGEX_announce_cancel (struct GNUNET_REGEX_Announcement *a) | ||
180 | { | ||
181 | GNUNET_MQ_destroy (a->mq); | ||
182 | GNUNET_free (a->regex); | ||
183 | GNUNET_free (a); | ||
184 | } | ||
185 | |||
186 | /* end of regex_api_announce.c */ | ||