regex_api_search.c

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/*
     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/>.
 
     SPDX-License-Identifier: AGPL3.0-or-later
 */
#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__)
 
 
struct GNUNET_REGEX_Search
{
  struct GNUNET_MQ_Handle *mq;
 
  const struct GNUNET_CONFIGURATION_Handle *cfg;
 
  GNUNET_REGEX_Found callback;
 
  void *callback_cls;
 
  char *string;
};
 
 
static void
search_reconnect (struct GNUNET_REGEX_Search *s);
 
 
static int
check_search_response (void *cls,
                       const struct ResultMessage *result)
{
  uint16_t size = ntohs (result->header.size) - sizeof(*result);
  uint16_t gpl = ntohs (result->get_path_length);
  uint16_t ppl = ntohs (result->put_path_length);
 
  if (size != (gpl + ppl) * sizeof(struct GNUNET_PeerIdentity))
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}
 
 
static void
handle_search_response (void *cls,
                        const struct ResultMessage *result)
{
  struct GNUNET_REGEX_Search *s = cls;
  uint16_t gpl = ntohs (result->get_path_length);
  uint16_t ppl = ntohs (result->put_path_length);
  const struct GNUNET_PeerIdentity *pid;
 
  pid = &result->id;
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Got regex result %s\n",
       GNUNET_i2s (pid));
  s->callback (s->callback_cls,
               pid,
               &pid[1],
               gpl,
               &pid[1 + gpl],
               ppl);
}
 
 
static void
mq_error_handler (void *cls,
                  enum GNUNET_MQ_Error error)
{
  struct GNUNET_REGEX_Search *s = cls;
 
  GNUNET_MQ_destroy (s->mq);
  s->mq = NULL;
  search_reconnect (s);
}
 
 
static void
search_reconnect (struct GNUNET_REGEX_Search *s)
{
  struct GNUNET_MQ_MessageHandler handlers[] = {
    GNUNET_MQ_hd_var_size (search_response,
                           GNUNET_MESSAGE_TYPE_REGEX_RESULT,
                           struct ResultMessage,
                           s),
    GNUNET_MQ_handler_end ()
  };
  size_t slen = strlen (s->string) + 1;
  struct GNUNET_MQ_Envelope *env;
  struct RegexSearchMessage *rsm;
 
  GNUNET_assert (NULL == s->mq);
  s->mq = GNUNET_CLIENT_connect (s->cfg,
                                 "regex",
                                 handlers,
                                 &mq_error_handler,
                                 s);
  if (NULL == s->mq)
    return;
  env = GNUNET_MQ_msg_extra (rsm,
                             slen,
                             GNUNET_MESSAGE_TYPE_REGEX_SEARCH);
  GNUNET_memcpy (&rsm[1],
                 s->string,
                 slen);
  GNUNET_MQ_send (s->mq,
                  env);
}
 
 
struct GNUNET_REGEX_Search *
GNUNET_REGEX_search (const struct GNUNET_CONFIGURATION_Handle *cfg,
                     const char *string,
                     GNUNET_REGEX_Found callback,
                     void *callback_cls)
{
  struct GNUNET_REGEX_Search *s;
  size_t slen = strlen (string) + 1;
 
  if (slen + sizeof(struct RegexSearchMessage) >= GNUNET_MAX_MESSAGE_SIZE)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                _ ("Search string `%s' is too long!\n"),
                string);
    GNUNET_break (0);
    return NULL;
  }
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Starting regex search for %s\n",
       string);
  s = GNUNET_new (struct GNUNET_REGEX_Search);
  s->cfg = cfg;
  s->string = GNUNET_strdup (string);
  s->callback = callback;
  s->callback_cls = callback_cls;
  search_reconnect (s);
  if (NULL == s->mq)
  {
    GNUNET_free (s->string);
    GNUNET_free (s);
    return NULL;
  }
  return s;
}
 
 
void
GNUNET_REGEX_search_cancel (struct GNUNET_REGEX_Search *s)
{
  GNUNET_MQ_destroy (s->mq);
  GNUNET_free (s->string);
  GNUNET_free (s);
}
 
 
/* end of regex_api_search.c */