1 files changed, 184 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..e3ad70c6a
--- /dev/null
+++ b/src/regex/regex_api_announce.c
@@ -0,0 +1,184 @@
+/*
+     This file is part of GNUnet
+     Copyright (C) 2012, 2013, 2016 GNUnet e.V.
+
+     GNUnet is free software: you can redistribute it and/or modify it
+     under the terms of the GNU Affero General Public License as published
+     by the Free Software Foundation, either version 3 of the License,
+     or (at your option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     Affero General Public License for more details.
+    
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @file regex/regex_api_announce.c
+ * @brief access regex service to advertise capabilities via regex
+ * @author Maximilian Szengel
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_protocols.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_regex_service.h"
+#include "regex_ipc.h"
+
+#define LOG(kind,...) GNUNET_log_from (kind, "regex-api",__VA_ARGS__)
+
+/**
+ * Handle to store cached data about a regex announce.
+ */
+struct GNUNET_REGEX_Announcement
+{
+  /**
+   * Connection to the regex service.
+   */
+  struct GNUNET_MQ_Handle *mq;
+
+  /**
+   * Our configuration.
+   */
+  const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+  /**
+   * Message we're sending to the service.
+   */
+  char *regex;
+
+  /**
+   * Frequency of announcements.
+   */
+  struct GNUNET_TIME_Relative refresh_delay;
+
+  /**
+   * Number of characters per edge.
+   */
+  uint16_t compression;
+};
+
+
+
+/**
+ * (Re)connect to the REGEX service with the given announcement @a a.
+ *
+ * @param a REGEX to announce.
+ */
+static void
+announce_reconnect (struct GNUNET_REGEX_Announcement *a);
+
+
+/**
+ * We got a disconnect after asking regex to do the announcement.
+ * Retry.
+ *
+ * @param cls the `struct GNUNET_REGEX_Announcement` to retry
+ * @param error error code
+ */
+static void
+announce_mq_error_handler (void *cls,
+                           enum GNUNET_MQ_Error error)
+{
+  struct GNUNET_REGEX_Announcement *a = cls;
+
+  GNUNET_MQ_destroy (a->mq);
+  a->mq = NULL;
+  announce_reconnect (a);
+}
+
+
+/**
+ * (Re)connect to the REGEX service with the given announcement @a a.
+ *
+ * @param a REGEX to announce.
+ */
+static void
+announce_reconnect (struct GNUNET_REGEX_Announcement *a)
+{
+  struct GNUNET_MQ_Envelope *env;
+  struct AnnounceMessage *am;
+  size_t slen;
+
+  a->mq = GNUNET_CLIENT_connect (a->cfg,
+                                 "regex",
+                                 NULL,
+                                 &announce_mq_error_handler,
+                                 a);
+  if (NULL == a->mq)
+    return;
+  slen = strlen (a->regex) + 1;
+  env = GNUNET_MQ_msg_extra (am,
+                             slen,
+                             GNUNET_MESSAGE_TYPE_REGEX_ANNOUNCE);
+  am->compression = htons (a->compression);
+  am->reserved = htons (0);
+  am->refresh_delay = GNUNET_TIME_relative_hton (a->refresh_delay);
+  GNUNET_memcpy (&am[1],
+          a->regex,
+          slen);
+  GNUNET_MQ_send (a->mq,
+                  env);
+}
+
+
+/**
+ * Announce the given peer under the given regular expression.
+ *
+ * @param cfg configuration to use
+ * @param regex Regular expression to announce.
+ * @param refresh_delay after what delay should the announcement be repeated?
+ * @param compression How many characters per edge can we squeeze?
+ * @return Handle to reuse o free cached resources.
+ *         Must be freed by calling #GNUNET_REGEX_announce_cancel().
+ */
+struct GNUNET_REGEX_Announcement *
+GNUNET_REGEX_announce (const struct GNUNET_CONFIGURATION_Handle *cfg,
+                       const char *regex,
+                       struct GNUNET_TIME_Relative refresh_delay,
+                       uint16_t compression)
+{
+  struct GNUNET_REGEX_Announcement *a;
+  size_t slen;
+
+  slen = strlen (regex) + 1;
+  if (slen + sizeof (struct AnnounceMessage) >= GNUNET_MAX_MESSAGE_SIZE)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                _("Regex `%s' is too long!\n"),
+                regex);
+    GNUNET_break (0);
+    return NULL;
+  }
+  a = GNUNET_new (struct GNUNET_REGEX_Announcement);
+  a->cfg = cfg;
+  a->refresh_delay = refresh_delay;
+  a->compression = compression;
+  a->regex = GNUNET_strdup (regex);
+  announce_reconnect (a);
+  if (NULL == a->mq)
+  {
+    GNUNET_free (a->regex);
+    GNUNET_free (a);
+    return NULL;
+  }
+  return a;
+}
+
+
+/**
+ * Stop announcing the regex specified by the given handle.
+ *
+ * @param a handle returned by a previous #GNUNET_REGEX_announce() call.
+ */
+void
+GNUNET_REGEX_announce_cancel (struct GNUNET_REGEX_Announcement *a)
+{
+  GNUNET_MQ_destroy (a->mq);
+  GNUNET_free (a->regex);
+  GNUNET_free (a);
+}
+
+/* end of regex_api_announce.c */