gnunet-service-identity.c

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/*
   This file is part of GNUnet.
   Copyright (C) 2013 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_util_lib.h"
#include "gnunet_constants.h"
#include "gnunet_protocols.h"
#include "gnunet_statistics_service.h"
#include "gnunet_identity_service.h"
#include "identity.h"


struct Ego {
  struct Ego *next;

  struct Ego *prev;

  struct GNUNET_CRYPTO_EcdsaPrivateKey *pk;

  char *identifier;
};


static const struct GNUNET_CONFIGURATION_Handle *cfg;

static struct GNUNET_CONFIGURATION_Handle *subsystem_cfg;

static struct GNUNET_STATISTICS_Handle *stats;

static struct GNUNET_NotificationContext *nc;

static char *ego_directory;

static char *subsystem_cfg_file;

static struct Ego *ego_head;

static struct Ego *ego_tail;


static char *
get_ego_filename(struct Ego *ego)
{
  char *filename;

  GNUNET_asprintf(&filename,
                  "%s%s%s",
                  ego_directory,
                  DIR_SEPARATOR_STR,
                  ego->identifier);
  return filename;
}

static void
client_disconnect_cb(void *cls,
                     struct GNUNET_SERVICE_Client *client,
                     void *app_ctx)
{
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Client %p disconnected\n", client);
}


static void *
client_connect_cb(void *cls,
                  struct GNUNET_SERVICE_Client *client,
                  struct GNUNET_MQ_Handle *mq)
{
  return client;
}

static void
shutdown_task(void *cls)
{
  struct Ego *e;

  if (NULL != nc)
    {
      GNUNET_notification_context_destroy(nc);
      nc = NULL;
    }
  if (NULL != stats)
    {
      GNUNET_STATISTICS_destroy(stats, GNUNET_NO);
      stats = NULL;
    }
  GNUNET_CONFIGURATION_destroy(subsystem_cfg);
  subsystem_cfg = NULL;
  GNUNET_free(subsystem_cfg_file);
  subsystem_cfg_file = NULL;
  GNUNET_free(ego_directory);
  ego_directory = NULL;
  while (NULL != (e = ego_head))
    {
      GNUNET_CONTAINER_DLL_remove(ego_head, ego_tail, e);
      GNUNET_free(e->pk);
      GNUNET_free(e->identifier);
      GNUNET_free(e);
    }
}


static void
send_result_code(struct GNUNET_SERVICE_Client *client,
                 uint32_t result_code,
                 const char *emsg)
{
  struct ResultCodeMessage *rcm;
  struct GNUNET_MQ_Envelope *env;
  size_t elen;

  if (NULL == emsg)
    elen = 0;
  else
    elen = strlen(emsg) + 1;
  env =
    GNUNET_MQ_msg_extra(rcm, elen, GNUNET_MESSAGE_TYPE_IDENTITY_RESULT_CODE);
  rcm->result_code = htonl(result_code);
  if (0 < elen)
    GNUNET_memcpy(&rcm[1], emsg, elen);
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "Sending result %d (%s) to client\n",
             (int)result_code,
             emsg);
  GNUNET_MQ_send(GNUNET_SERVICE_client_get_mq(client), env);
}


static struct GNUNET_MQ_Envelope *
create_update_message(struct Ego *ego)
{
  struct UpdateMessage *um;
  struct GNUNET_MQ_Envelope *env;
  size_t name_len;

  name_len = (NULL == ego->identifier) ? 0 : (strlen(ego->identifier) + 1);
  env = GNUNET_MQ_msg_extra(um, name_len, GNUNET_MESSAGE_TYPE_IDENTITY_UPDATE);
  um->name_len = htons(name_len);
  um->end_of_list = htons(GNUNET_NO);
  um->private_key = *ego->pk;
  GNUNET_memcpy(&um[1], ego->identifier, name_len);
  return env;
}


static struct GNUNET_MQ_Envelope *
create_set_default_message(struct Ego *ego, const char *servicename)
{
  struct SetDefaultMessage *sdm;
  struct GNUNET_MQ_Envelope *env;
  size_t name_len;

  name_len = (NULL == servicename) ? 0 : (strlen(servicename) + 1);
  env = GNUNET_MQ_msg_extra(sdm,
                            name_len,
                            GNUNET_MESSAGE_TYPE_IDENTITY_SET_DEFAULT);
  sdm->name_len = htons(name_len);
  sdm->reserved = htons(0);
  sdm->private_key = *ego->pk;
  GNUNET_memcpy(&sdm[1], servicename, name_len);
  return env;
}


static void
handle_start_message(void *cls, const struct GNUNET_MessageHeader *message)
{
  struct GNUNET_SERVICE_Client *client = cls;
  struct UpdateMessage *ume;
  struct GNUNET_MQ_Envelope *env;
  struct Ego *ego;

  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received START message from client\n");
  GNUNET_SERVICE_client_mark_monitor(client);
  GNUNET_SERVICE_client_disable_continue_warning(client);
  GNUNET_notification_context_add(nc, GNUNET_SERVICE_client_get_mq(client));
  for (ego = ego_head; NULL != ego; ego = ego->next)
    {
      env = create_update_message(ego);
      GNUNET_MQ_send(GNUNET_SERVICE_client_get_mq(client), env);
    }
  env = GNUNET_MQ_msg_extra(ume, 0, GNUNET_MESSAGE_TYPE_IDENTITY_UPDATE);
  ume->end_of_list = htons(GNUNET_YES);
  ume->name_len = htons(0);
  GNUNET_MQ_send(GNUNET_SERVICE_client_get_mq(client), env);
  GNUNET_SERVICE_client_continue(client);
}


static int
check_lookup_message(void *cls, const struct LookupMessage *message)
{
  GNUNET_MQ_check_zero_termination(message);
  return GNUNET_OK;
}


static void
handle_lookup_message(void *cls, const struct LookupMessage *message)
{
  struct GNUNET_SERVICE_Client *client = cls;
  const char *name;
  struct GNUNET_MQ_Envelope *env;
  struct Ego *ego;

  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received LOOKUP message from client\n");
  name = (const char *)&message[1];
  for (ego = ego_head; NULL != ego; ego = ego->next)
    {
      if (0 != strcasecmp(name, ego->identifier))
        continue;
      env = create_update_message(ego);
      GNUNET_MQ_send(GNUNET_SERVICE_client_get_mq(client), env);
      GNUNET_SERVICE_client_continue(client);
      return;
    }
  send_result_code(client, 0, "ego not found");
  GNUNET_SERVICE_client_continue(client);
}


static int
check_lookup_by_suffix_message(void *cls, const struct LookupMessage *message)
{
  GNUNET_MQ_check_zero_termination(message);
  return GNUNET_OK;
}


static void
handle_lookup_by_suffix_message(void *cls, const struct LookupMessage *message)
{
  struct GNUNET_SERVICE_Client *client = cls;
  const char *name;
  struct GNUNET_MQ_Envelope *env;
  struct Ego *lprefix;

  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "Received LOOKUP_BY_SUFFIX message from client\n");
  name = (const char *)&message[1];
  lprefix = NULL;
  for (struct Ego *ego = ego_head; NULL != ego; ego = ego->next)
    {
      if ((strlen(ego->identifier) <= strlen(name)) &&
          (0 == strcmp(ego->identifier,
                       &name[strlen(name) - strlen(ego->identifier)])) &&
          ((strlen(name) == strlen(ego->identifier)) ||
           ('.' == name[strlen(name) - strlen(ego->identifier) - 1])) &&
          ((NULL == lprefix) ||
           (strlen(ego->identifier) > strlen(lprefix->identifier))))
        {
          /* found better match, update! */
          lprefix = ego;
        }
    }
  if (NULL != lprefix)
    {
      env = create_update_message(lprefix);
      GNUNET_MQ_send(GNUNET_SERVICE_client_get_mq(client), env);
      GNUNET_SERVICE_client_continue(client);
      return;
    }
  send_result_code(client, 0, "ego not found");
  GNUNET_SERVICE_client_continue(client);
}


static int
check_get_default_message(void *cls, const struct GetDefaultMessage *msg)
{
  uint16_t size;
  uint16_t name_len;
  const char *name;

  size = ntohs(msg->header.size);
  if (size <= sizeof(struct GetDefaultMessage))
    {
      GNUNET_break(0);
      return GNUNET_SYSERR;
    }
  name = (const char *)&msg[1];
  name_len = ntohs(msg->name_len);
  if ((name_len + sizeof(struct GetDefaultMessage) != size) ||
      (0 != ntohs(msg->reserved)) || ('\0' != name[name_len - 1]))
    {
      GNUNET_break(0);
      return GNUNET_SYSERR;
    }
  return GNUNET_OK;
}


static void
handle_get_default_message(void *cls, const struct GetDefaultMessage *gdm)
{
  struct GNUNET_MQ_Envelope *env;
  struct GNUNET_SERVICE_Client *client = cls;
  struct Ego *ego;
  char *name;
  char *identifier;


  name = GNUNET_strdup((const char *)&gdm[1]);
  GNUNET_STRINGS_utf8_tolower((const char *)&gdm[1], name);
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "Received GET_DEFAULT for service `%s' from client\n",
             name);
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string(subsystem_cfg,
                                                         name,
                                                         "DEFAULT_IDENTIFIER",
                                                         &identifier))
    {
      send_result_code(client, 1, gettext_noop("no default known"));
      GNUNET_SERVICE_client_continue(client);
      GNUNET_free(name);
      return;
    }
  for (ego = ego_head; NULL != ego; ego = ego->next)
    {
      if (0 == strcmp(ego->identifier, identifier))
        {
          env = create_set_default_message(ego, name);
          GNUNET_MQ_send(GNUNET_SERVICE_client_get_mq(client), env);
          GNUNET_SERVICE_client_continue(client);
          GNUNET_free(identifier);
          GNUNET_free(name);
          return;
        }
    }
  GNUNET_free(identifier);
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Failed to find ego `%s'\n", name);
  GNUNET_free(name);
  send_result_code(client,
                   1,
                   gettext_noop(
                     "default configured, but ego unknown (internal error)"));
  GNUNET_SERVICE_client_continue(client);
}


static int
key_cmp(const struct GNUNET_CRYPTO_EcdsaPrivateKey *pk1,
        const struct GNUNET_CRYPTO_EcdsaPrivateKey *pk2)
{
  return GNUNET_memcmp(pk1, pk2);
}

static int
check_set_default_message(void *cls, const struct SetDefaultMessage *msg)
{
  uint16_t size;
  uint16_t name_len;
  const char *str;

  size = ntohs(msg->header.size);
  if (size <= sizeof(struct SetDefaultMessage))
    {
      GNUNET_break(0);
      return GNUNET_SYSERR;
    }
  name_len = ntohs(msg->name_len);
  GNUNET_break(0 == ntohs(msg->reserved));
  if (name_len + sizeof(struct SetDefaultMessage) != size)
    {
      GNUNET_break(0);
      return GNUNET_SYSERR;
    }
  str = (const char *)&msg[1];
  if ('\0' != str[name_len - 1])
    {
      GNUNET_break(0);
      return GNUNET_SYSERR;
    }
  return GNUNET_OK;
}

static void
handle_set_default_message(void *cls, const struct SetDefaultMessage *sdm)
{
  struct Ego *ego;
  struct GNUNET_SERVICE_Client *client = cls;
  char *str;

  str = GNUNET_strdup((const char *)&sdm[1]);
  GNUNET_STRINGS_utf8_tolower((const char *)&sdm[1], str);

  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "Received SET_DEFAULT for service `%s' from client\n",
             str);
  for (ego = ego_head; NULL != ego; ego = ego->next)
    {
      if (0 == key_cmp(ego->pk, &sdm->private_key))
        {
          GNUNET_CONFIGURATION_set_value_string(subsystem_cfg,
                                                str,
                                                "DEFAULT_IDENTIFIER",
                                                ego->identifier);
          if (GNUNET_OK !=
              GNUNET_CONFIGURATION_write(subsystem_cfg, subsystem_cfg_file))
            GNUNET_log(
              GNUNET_ERROR_TYPE_ERROR,
              _("Failed to write subsystem default identifier map to `%s'.\n"),
              subsystem_cfg_file);
          send_result_code(client, 0, NULL);
          GNUNET_SERVICE_client_continue(client);
          GNUNET_free(str);
          return;
        }
    }
  send_result_code(client,
                   1,
                   _("Unknown ego specified for service (internal error)"));
  GNUNET_free(str);
  GNUNET_SERVICE_client_continue(client);
}


static void
notify_listeners(struct Ego *ego)
{
  struct UpdateMessage *um;
  size_t name_len;

  name_len = (NULL == ego->identifier) ? 0 : (strlen(ego->identifier) + 1);
  um = GNUNET_malloc(sizeof(struct UpdateMessage) + name_len);
  um->header.type = htons(GNUNET_MESSAGE_TYPE_IDENTITY_UPDATE);
  um->header.size = htons(sizeof(struct UpdateMessage) + name_len);
  um->name_len = htons(name_len);
  um->end_of_list = htons(GNUNET_NO);
  um->private_key = *ego->pk;
  GNUNET_memcpy(&um[1], ego->identifier, name_len);
  GNUNET_notification_context_broadcast(nc, &um->header, GNUNET_NO);
  GNUNET_free(um);
}

static int
check_create_message(void *cls, const struct CreateRequestMessage *msg)
{
  uint16_t size;
  uint16_t name_len;
  const char *str;

  size = ntohs(msg->header.size);
  if (size <= sizeof(struct CreateRequestMessage))
    {
      GNUNET_break(0);
      return GNUNET_SYSERR;
    }
  name_len = ntohs(msg->name_len);
  GNUNET_break(0 == ntohs(msg->reserved));
  if (name_len + sizeof(struct CreateRequestMessage) != size)
    {
      GNUNET_break(0);
      return GNUNET_SYSERR;
    }
  str = (const char *)&msg[1];
  if ('\0' != str[name_len - 1])
    {
      GNUNET_break(0);
      return GNUNET_SYSERR;
    }
  return GNUNET_OK;
}

static void
handle_create_message(void *cls, const struct CreateRequestMessage *crm)
{
  struct GNUNET_SERVICE_Client *client = cls;
  struct Ego *ego;
  char *str;
  char *fn;

  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received CREATE message from client\n");
  str = GNUNET_strdup((const char *)&crm[1]);
  GNUNET_STRINGS_utf8_tolower((const char *)&crm[1], str);
  for (ego = ego_head; NULL != ego; ego = ego->next)
    {
      if (0 == strcmp(ego->identifier, str))
        {
          send_result_code(client,
                           1,
                           gettext_noop(
                             "identifier already in use for another ego"));
          GNUNET_SERVICE_client_continue(client);
          GNUNET_free(str);
          return;
        }
    }
  ego = GNUNET_new(struct Ego);
  ego->pk = GNUNET_new(struct GNUNET_CRYPTO_EcdsaPrivateKey);
  *ego->pk = crm->private_key;
  ego->identifier = GNUNET_strdup(str);
  GNUNET_CONTAINER_DLL_insert(ego_head, ego_tail, ego);
  send_result_code(client, 0, NULL);
  fn = get_ego_filename(ego);
  (void)GNUNET_DISK_directory_create_for_file(fn);
  if (sizeof(struct GNUNET_CRYPTO_EcdsaPrivateKey) !=
      GNUNET_DISK_fn_write(fn,
                           &crm->private_key,
                           sizeof(struct GNUNET_CRYPTO_EcdsaPrivateKey),
                           GNUNET_DISK_PERM_USER_READ |
                           GNUNET_DISK_PERM_USER_WRITE))
    GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_ERROR, "write", fn);
  GNUNET_free(fn);
  GNUNET_free(str);
  notify_listeners(ego);
  GNUNET_SERVICE_client_continue(client);
}


struct RenameContext {
  const char *old_name;

  const char *new_name;
};

static void
handle_ego_rename(void *cls, const char *section)
{
  struct RenameContext *rc = cls;
  char *id;

  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string(subsystem_cfg,
                                                         section,
                                                         "DEFAULT_IDENTIFIER",
                                                         &id))
    return;
  if (0 != strcmp(id, rc->old_name))
    {
      GNUNET_free(id);
      return;
    }
  GNUNET_CONFIGURATION_set_value_string(subsystem_cfg,
                                        section,
                                        "DEFAULT_IDENTIFIER",
                                        rc->new_name);
  GNUNET_free(id);
}

static int
check_rename_message(void *cls, const struct RenameMessage *msg)
{
  uint16_t size;
  uint16_t old_name_len;
  uint16_t new_name_len;
  const char *old_name;
  const char *new_name;

  size = ntohs(msg->header.size);
  if (size <= sizeof(struct RenameMessage))
    {
      GNUNET_break(0);
      return GNUNET_SYSERR;
    }
  old_name_len = ntohs(msg->old_name_len);
  new_name_len = ntohs(msg->new_name_len);
  old_name = (const char *)&msg[1];
  new_name = &old_name[old_name_len];
  if ((old_name_len + new_name_len + sizeof(struct RenameMessage) != size) ||
      ('\0' != old_name[old_name_len - 1]) ||
      ('\0' != new_name[new_name_len - 1]))
    {
      GNUNET_break(0);
      return GNUNET_SYSERR;
    }

  return GNUNET_OK;
}


static void
handle_rename_message(void *cls, const struct RenameMessage *rm)
{
  uint16_t old_name_len;
  struct Ego *ego;
  char *old_name;
  char *new_name;
  struct RenameContext rename_ctx;
  struct GNUNET_SERVICE_Client *client = cls;
  char *fn_old;
  char *fn_new;
  const char *old_name_tmp;

  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received RENAME message from client\n");
  old_name_len = ntohs(rm->old_name_len);
  old_name_tmp = (const char *)&rm[1];
  old_name = GNUNET_strdup(old_name_tmp);
  GNUNET_STRINGS_utf8_tolower(old_name_tmp, old_name);
  new_name = GNUNET_strdup(&old_name_tmp[old_name_len]);
  GNUNET_STRINGS_utf8_tolower(&old_name_tmp[old_name_len], new_name);

  /* check if new name is already in use */
  for (ego = ego_head; NULL != ego; ego = ego->next)
    {
      if (0 == strcmp(ego->identifier, new_name))
        {
          send_result_code(client, 1, gettext_noop("target name already exists"));
          GNUNET_SERVICE_client_continue(client);
          GNUNET_free(old_name);
          GNUNET_free(new_name);
          return;
        }
    }

  /* locate old name and, if found, perform rename */
  for (ego = ego_head; NULL != ego; ego = ego->next)
    {
      if (0 == strcmp(ego->identifier, old_name))
        {
          fn_old = get_ego_filename(ego);
          GNUNET_free(ego->identifier);
          rename_ctx.old_name = old_name;
          rename_ctx.new_name = new_name;
          GNUNET_CONFIGURATION_iterate_sections(subsystem_cfg,
                                                &handle_ego_rename,
                                                &rename_ctx);
          if (GNUNET_OK !=
              GNUNET_CONFIGURATION_write(subsystem_cfg, subsystem_cfg_file))
            GNUNET_log(
              GNUNET_ERROR_TYPE_ERROR,
              _("Failed to write subsystem default identifier map to `%s'.\n"),
              subsystem_cfg_file);
          ego->identifier = GNUNET_strdup(new_name);
          fn_new = get_ego_filename(ego);
          if (0 != rename(fn_old, fn_new))
            GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_WARNING, "rename", fn_old);
          GNUNET_free(fn_old);
          GNUNET_free(fn_new);
          GNUNET_free(old_name);
          GNUNET_free(new_name);
          notify_listeners(ego);
          send_result_code(client, 0, NULL);
          GNUNET_SERVICE_client_continue(client);
          return;
        }
    }

  /* failed to locate old name */
  send_result_code(client, 1, gettext_noop("no matching ego found"));
  GNUNET_free(old_name);
  GNUNET_free(new_name);
  GNUNET_SERVICE_client_continue(client);
}


static void
handle_ego_delete(void *cls, const char *section)
{
  const char *identifier = cls;
  char *id;

  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string(subsystem_cfg,
                                                         section,
                                                         "DEFAULT_IDENTIFIER",
                                                         &id))
    return;
  if (0 != strcmp(id, identifier))
    {
      GNUNET_free(id);
      return;
    }
  GNUNET_CONFIGURATION_set_value_string(subsystem_cfg,
                                        section,
                                        "DEFAULT_IDENTIFIER",
                                        NULL);
  GNUNET_free(id);
}

static int
check_delete_message(void *cls, const struct DeleteMessage *msg)
{
  uint16_t size;
  uint16_t name_len;
  const char *name;

  size = ntohs(msg->header.size);
  if (size <= sizeof(struct DeleteMessage))
    {
      GNUNET_break(0);
      return GNUNET_SYSERR;
    }
  name = (const char *)&msg[1];
  name_len = ntohs(msg->name_len);
  if ((name_len + sizeof(struct DeleteMessage) != size) ||
      (0 != ntohs(msg->reserved)) || ('\0' != name[name_len - 1]))
    {
      GNUNET_break(0);
      return GNUNET_SYSERR;
    }
  return GNUNET_OK;
}


static void
handle_delete_message(void *cls, const struct DeleteMessage *dm)
{
  struct Ego *ego;
  char *name;
  char *fn;
  struct GNUNET_SERVICE_Client *client = cls;

  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received DELETE message from client\n");
  name = GNUNET_strdup((const char *)&dm[1]);
  GNUNET_STRINGS_utf8_tolower((const char *)&dm[1], name);

  for (ego = ego_head; NULL != ego; ego = ego->next)
    {
      if (0 == strcmp(ego->identifier, name))
        {
          GNUNET_CONTAINER_DLL_remove(ego_head, ego_tail, ego);
          GNUNET_CONFIGURATION_iterate_sections(subsystem_cfg,
                                                &handle_ego_delete,
                                                ego->identifier);
          if (GNUNET_OK !=
              GNUNET_CONFIGURATION_write(subsystem_cfg, subsystem_cfg_file))
            GNUNET_log(
              GNUNET_ERROR_TYPE_ERROR,
              _("Failed to write subsystem default identifier map to `%s'.\n"),
              subsystem_cfg_file);
          fn = get_ego_filename(ego);
          if (0 != unlink(fn))
            GNUNET_log_strerror_file(GNUNET_ERROR_TYPE_WARNING, "unlink", fn);
          GNUNET_free(fn);
          GNUNET_free(ego->identifier);
          ego->identifier = NULL;
          notify_listeners(ego);
          GNUNET_free(ego->pk);
          GNUNET_free(ego);
          GNUNET_free(name);
          send_result_code(client, 0, NULL);
          GNUNET_SERVICE_client_continue(client);
          return;
        }
    }

  send_result_code(client, 1, gettext_noop("no matching ego found"));
  GNUNET_free(name);
  GNUNET_SERVICE_client_continue(client);
}


static int
process_ego_file(void *cls, const char *filename)
{
  struct Ego *ego;
  const char *fn;

  fn = strrchr(filename, (int)DIR_SEPARATOR);
  if (NULL == fn)
    {
      GNUNET_break(0);
      return GNUNET_OK;
    }
  ego = GNUNET_new(struct Ego);
  ego->pk = GNUNET_CRYPTO_ecdsa_key_create_from_file(filename);
  if (NULL == ego->pk)
    {
      GNUNET_free(ego);
      GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
                 _("Failed to parse ego information in `%s'\n"),
                 filename);
      return GNUNET_OK;
    }
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Loaded ego `%s'\n", fn + 1);
  ego->identifier = GNUNET_strdup(fn + 1);
  GNUNET_CONTAINER_DLL_insert(ego_head, ego_tail, ego);
  return GNUNET_OK;
}


static void
run(void *cls,
    const struct GNUNET_CONFIGURATION_Handle *c,
    struct GNUNET_SERVICE_Handle *service)
{
  cfg = c;
  nc = GNUNET_notification_context_create(1);
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename(cfg,
                                                           "identity",
                                                           "EGODIR",
                                                           &ego_directory))
    {
      GNUNET_log_config_missing(GNUNET_ERROR_TYPE_ERROR, "identity", "EGODIR");
      GNUNET_SCHEDULER_shutdown();
      return;
    }
  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_filename(cfg,
                                              "identity",
                                              "SUBSYSTEM_CFG",
                                              &subsystem_cfg_file))
    {
      GNUNET_log_config_missing(GNUNET_ERROR_TYPE_ERROR,
                                "identity",
                                "SUBSYSTEM_CFG");
      GNUNET_SCHEDULER_shutdown();
      return;
    }
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "Loading subsystem configuration `%s'\n",
             subsystem_cfg_file);
  subsystem_cfg = GNUNET_CONFIGURATION_create();
  if ((GNUNET_YES == GNUNET_DISK_file_test(subsystem_cfg_file)) &&
      (GNUNET_OK !=
       GNUNET_CONFIGURATION_parse(subsystem_cfg, subsystem_cfg_file)))
    {
      GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
                 _(
                   "Failed to parse subsystem identity configuration file `%s'\n"),
                 subsystem_cfg_file);
      GNUNET_SCHEDULER_shutdown();
      return;
    }
  stats = GNUNET_STATISTICS_create("identity", cfg);
  if (GNUNET_OK != GNUNET_DISK_directory_create(ego_directory))
    {
      GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
                 _("Failed to create directory `%s' for storing egos\n"),
                 ego_directory);
    }
  GNUNET_DISK_directory_scan(ego_directory, &process_ego_file, NULL);
  GNUNET_SCHEDULER_add_shutdown(&shutdown_task, NULL);
}


GNUNET_SERVICE_MAIN(
  "identity",
  GNUNET_SERVICE_OPTION_NONE,
  &run,
  &client_connect_cb,
  &client_disconnect_cb,
  NULL,
  GNUNET_MQ_hd_fixed_size(start_message,
                          GNUNET_MESSAGE_TYPE_IDENTITY_START,
                          struct GNUNET_MessageHeader,
                          NULL),
  GNUNET_MQ_hd_var_size(lookup_message,
                        GNUNET_MESSAGE_TYPE_IDENTITY_LOOKUP,
                        struct LookupMessage,
                        NULL),
  GNUNET_MQ_hd_var_size(lookup_by_suffix_message,
                        GNUNET_MESSAGE_TYPE_IDENTITY_LOOKUP_BY_SUFFIX,
                        struct LookupMessage,
                        NULL),
  GNUNET_MQ_hd_var_size(get_default_message,
                        GNUNET_MESSAGE_TYPE_IDENTITY_GET_DEFAULT,
                        struct GetDefaultMessage,
                        NULL),
  GNUNET_MQ_hd_var_size(set_default_message,
                        GNUNET_MESSAGE_TYPE_IDENTITY_SET_DEFAULT,
                        struct SetDefaultMessage,
                        NULL),
  GNUNET_MQ_hd_var_size(create_message,
                        GNUNET_MESSAGE_TYPE_IDENTITY_CREATE,
                        struct CreateRequestMessage,
                        NULL),
  GNUNET_MQ_hd_var_size(rename_message,
                        GNUNET_MESSAGE_TYPE_IDENTITY_RENAME,
                        struct RenameMessage,
                        NULL),
  GNUNET_MQ_hd_var_size(delete_message,
                        GNUNET_MESSAGE_TYPE_IDENTITY_DELETE,
                        struct DeleteMessage,
                        NULL),
  GNUNET_MQ_handler_end());


/* end of gnunet-service-identity.c */