plugin_gnsrecord_messenger.c

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/*
   This file is part of GNUnet.
   Copyright (C) 2021--2026 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 "gnunet_common.h"
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnu_name_system_record_types.h"
#include "gnunet_messenger_service.h"
#include "gnunet_gnsrecord_plugin.h"
 
 
static char *
messenger_value_to_string (void *cls,
                           uint32_t type,
                           const void *data,
                           size_t data_size)
{
  (void) cls;
  switch (type)
  {
  case GNUNET_GNSRECORD_TYPE_MESSENGER_ROOM_ENTRY:
    {
      if (data_size != sizeof(struct GNUNET_MESSENGER_RoomEntryRecord))
      {
        GNUNET_break_op (0);
        return NULL;
      }
      {
        const struct GNUNET_MESSENGER_RoomEntryRecord *record = data;
 
        char *door = GNUNET_CRYPTO_eddsa_public_key_to_string (
          &(record->door.public_key));
        char *key = GNUNET_STRINGS_data_to_string_alloc (
          &(record->key), sizeof(struct GNUNET_HashCode));
 
        char *ret;
        GNUNET_asprintf (&ret, "%s-%s", key, door);
        GNUNET_free (key);
        GNUNET_free (door);
        return ret;
      }
    }
  case GNUNET_GNSRECORD_TYPE_MESSENGER_ROOM_DETAILS:
    {
      if (data_size != sizeof(struct GNUNET_MESSENGER_RoomDetailsRecord))
      {
        GNUNET_break_op (0);
        return NULL;
      }
      {
        const struct GNUNET_MESSENGER_RoomDetailsRecord *record = data;
 
        char *name = GNUNET_strndup (record->name, 256);
        char *flags = GNUNET_STRINGS_data_to_string_alloc (
          &(record->flags), sizeof(uint32_t));
 
        char *ret;
        GNUNET_asprintf (&ret, "%s-%s", flags, name);
        GNUNET_free (flags);
        GNUNET_free (name);
        return ret;
      }
    }
  case GNUNET_GNSRECORD_TYPE_MESSENGER_ROOM_EPOCH_KEY:
    {
      if (data_size != sizeof(struct GNUNET_MESSENGER_RoomEpochKeyRecord))
      {
        GNUNET_break_op (0);
        return NULL;
      }
      {
        const struct GNUNET_MESSENGER_RoomEpochKeyRecord *record = data;
 
        char *key = GNUNET_STRINGS_data_to_string_alloc (
          &(record->key),
          sizeof(struct GNUNET_HashCode));
        char *hash = GNUNET_STRINGS_data_to_string_alloc (
          &(record->hash),
          sizeof(struct GNUNET_HashCode));
        char *identifier = GNUNET_STRINGS_data_to_string_alloc (
          &(record->identifier),
          sizeof(struct GNUNET_ShortHashCode));
        char *shared_key = GNUNET_STRINGS_data_to_string_alloc (
          &(record->shared_key),
          sizeof(struct GNUNET_CRYPTO_SymmetricSessionKey));
        char *flags = GNUNET_STRINGS_data_to_string_alloc (
          &(record->flags),
          sizeof(uint32_t));
        char *checksum = GNUNET_STRINGS_data_to_string_alloc (
          &(record->checksum),
          sizeof(int32_t));
 
        char *ret;
        GNUNET_asprintf (
          &ret,
          "%s-%s-%s-%s-%s-%s",
          checksum,
          flags,
          shared_key,
          identifier,
          hash,
          key);
 
        GNUNET_free (checksum);
        GNUNET_free (flags);
        GNUNET_free (shared_key);
        GNUNET_free (identifier);
        GNUNET_free (hash);
        GNUNET_free (key);
        return ret;
      }
    }
  case GNUNET_GNSRECORD_TYPE_MESSENGER_ENCRYPTION_KEY:
    {
      if (data_size != sizeof(struct GNUNET_MESSENGER_EncryptionKeyRecord))
      {
        GNUNET_break_op (0);
        return NULL;
      }
      {
        const struct GNUNET_MESSENGER_EncryptionKeyRecord *record = data;
 
        char *key = GNUNET_STRINGS_data_to_string_alloc (
          &(record->key),
          sizeof(struct GNUNET_HashCode));
        char *nonce = GNUNET_STRINGS_data_to_string_alloc (
          &(record->nonce_data),
          sizeof(record->nonce_data));
        char *encryption_key_length = GNUNET_STRINGS_data_to_string_alloc (
          &(record->encrypted_key_length),
          sizeof(uint32_t));
        char *encryption_key_checksum = GNUNET_STRINGS_data_to_string_alloc (
          &(record->encrypted_key_checksum),
          sizeof(int32_t));
        char *encryption_key = GNUNET_STRINGS_data_to_string_alloc (
          &(record->encrypted_key_data),
          sizeof(record->encrypted_key_data));
 
        char *ret;
        GNUNET_asprintf (
          &ret,
          "%s-%s-%s-%s-%s",
          encryption_key,
          encryption_key_checksum,
          encryption_key_length,
          nonce,
          key);
 
        GNUNET_free (encryption_key);
        GNUNET_free (encryption_key_checksum);
        GNUNET_free (encryption_key_length);
        GNUNET_free (nonce);
        GNUNET_free (key);
        return ret;
      }
    }
  default:
    return NULL;
  }
}
 
 
static int
messenger_string_to_value (void *cls,
                           uint32_t type,
                           const char *s,
                           void **data,
                           size_t *data_size)
{
  (void) cls;
  if (NULL == s)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
 
  switch (type)
  {
  case GNUNET_GNSRECORD_TYPE_MESSENGER_ROOM_ENTRY:
    {
      char key[104];
      const char *dash;
      struct GNUNET_PeerIdentity door;
 
      if ((NULL == (dash = strchr (s, '-'))) ||
          (1 != sscanf (s, "%103s-", key)) ||
          (GNUNET_OK != GNUNET_CRYPTO_eddsa_public_key_from_string (
             dash + 1, strlen (dash + 1), &(door.public_key))))
      {
        GNUNET_log (
          GNUNET_ERROR_TYPE_ERROR,
          _ ("Unable to parse MESSENGER_ROOM_ENTRY record `%s'\n"),
          s);
 
        return GNUNET_SYSERR;
      }
      {
        struct GNUNET_MESSENGER_RoomEntryRecord *record = GNUNET_new (
          struct GNUNET_MESSENGER_RoomEntryRecord);
 
        if (GNUNET_OK != GNUNET_STRINGS_string_to_data (
              key, strlen (key),
              &(record->key), sizeof(struct GNUNET_HashCode)))
        {
          GNUNET_log (
            GNUNET_ERROR_TYPE_ERROR,
            _ ("Unable to parse MESSENGER_ROOM_ENTRY record `%s'\n"),
            s);
 
          GNUNET_free (record);
          return GNUNET_SYSERR;
        }
 
        record->door = door;
        *data = record;
        *data_size = sizeof(struct GNUNET_MESSENGER_RoomEntryRecord);
        return GNUNET_OK;
      }
    }
  case GNUNET_GNSRECORD_TYPE_MESSENGER_ROOM_DETAILS:
    {
      char flags[8];
      const char *dash;
 
      if ((NULL == (dash = strchr (s, '-'))) ||
          (1 != sscanf (s, "%7s-", flags)) ||
          (strlen (dash + 1) > 256))
      {
        GNUNET_log (
          GNUNET_ERROR_TYPE_ERROR,
          _ ("Unable to parse MESSENGER_ROOM_DETAILS record `%s'\n"),
          s);
 
        return GNUNET_SYSERR;
      }
      {
        struct GNUNET_MESSENGER_RoomDetailsRecord *record = GNUNET_new (
          struct GNUNET_MESSENGER_RoomDetailsRecord);
 
        if (GNUNET_OK != GNUNET_STRINGS_string_to_data (
              flags, strlen (flags),
              &(record->flags), sizeof(uint32_t)))
        {
          GNUNET_log (
            GNUNET_ERROR_TYPE_ERROR,
            _ ("Unable to parse MESSENGER_ROOM_DETAILS record `%s'\n"),
            s);
 
          GNUNET_free (record);
          return GNUNET_SYSERR;
        }
 
        GNUNET_memcpy (record->name, dash + 1, strlen (dash + 1));
 
        *data = record;
        *data_size = sizeof(struct GNUNET_MESSENGER_RoomDetailsRecord);
        return GNUNET_OK;
      }
    }
  case GNUNET_GNSRECORD_TYPE_MESSENGER_ROOM_EPOCH_KEY:
    {
      char key[104];
      char hash[104];
      char identifier[53];
      char shared_key[104];
      char flags[8];
      char checksum[8];
      const char *dash;
      const char *s0;
 
      s0 = s;
      if ((NULL == (dash = strchr (s0, '-'))) ||
          (1 != sscanf (s0, "%7s-", checksum)) ||
          (strlen (dash + 1) < 8))
      {
        GNUNET_log (
          GNUNET_ERROR_TYPE_ERROR,
          _ ("Unable to parse MESSENGER_ROOM_EPOCH_KEY record `%s'\n"),
          s);
 
        return GNUNET_SYSERR;
      }
 
      s0 = dash + 1;
      if ((NULL == (dash = strchr (s0, '-'))) ||
          (1 != sscanf (s0, "%7s-", flags)) ||
          (strlen (dash + 1) < 104))
      {
        GNUNET_log (
          GNUNET_ERROR_TYPE_ERROR,
          _ ("Unable to parse MESSENGER_ROOM_EPOCH_KEY record `%s'\n"),
          s);
 
        return GNUNET_SYSERR;
      }
 
      s0 = dash + 1;
      if ((NULL == (dash = strchr (s0, '-'))) ||
          (1 != sscanf (s0, "%103s-", shared_key)) ||
          (strlen (dash + 1) < 53))
      {
        GNUNET_log (
          GNUNET_ERROR_TYPE_ERROR,
          _ ("Unable to parse MESSENGER_ROOM_EPOCH_KEY record `%s'\n"),
          s);
 
        return GNUNET_SYSERR;
      }
 
      s0 = dash + 1;
      if ((NULL == (dash = strchr (s0, '-'))) ||
          (1 != sscanf (s0, "%52s-", identifier)) ||
          (strlen (dash + 1) < 104))
      {
        GNUNET_log (
          GNUNET_ERROR_TYPE_ERROR,
          _ ("Unable to parse MESSENGER_ROOM_EPOCH_KEY record `%s'\n"),
          s);
 
        return GNUNET_SYSERR;
      }
 
      s0 = dash + 1;
      if ((NULL == (dash = strchr (s0, '-'))) ||
          (1 != sscanf (s0, "%103s-", hash)) ||
          (strlen (dash + 1) != 103))
      {
        GNUNET_log (
          GNUNET_ERROR_TYPE_ERROR,
          _ ("Unable to parse MESSENGER_ROOM_EPOCH_KEY record `%s'\n"),
          s);
 
        return GNUNET_SYSERR;
      }
 
      GNUNET_memcpy (key, dash + 1, strlen (dash + 1));
      key[103] = '\0';
 
      {
        struct GNUNET_MESSENGER_RoomEpochKeyRecord *record = GNUNET_new (
          struct GNUNET_MESSENGER_RoomEpochKeyRecord);
 
        if ((GNUNET_OK != GNUNET_STRINGS_string_to_data (
               checksum, strlen (checksum),
               &(record->checksum), sizeof(int32_t))) ||
            (GNUNET_OK != GNUNET_STRINGS_string_to_data (
               flags, strlen (flags),
               &(record->flags), sizeof(uint32_t))) ||
            (GNUNET_OK != GNUNET_STRINGS_string_to_data (
               shared_key, strlen (shared_key),
               &(record->shared_key),
               sizeof(struct GNUNET_CRYPTO_SymmetricSessionKey)))
            ||
            (GNUNET_OK != GNUNET_STRINGS_string_to_data (
               identifier, strlen (identifier),
               &(record->identifier),
               sizeof(struct GNUNET_ShortHashCode)))
            ||
            (GNUNET_OK != GNUNET_STRINGS_string_to_data (
               hash, strlen (hash),
               &(record->hash),
               sizeof(struct GNUNET_HashCode))) ||
            (GNUNET_OK != GNUNET_STRINGS_string_to_data (
               key, strlen (key),
               &(record->key),
               sizeof(struct GNUNET_HashCode))))
        {
          GNUNET_log (
            GNUNET_ERROR_TYPE_ERROR,
            _ ("Unable to parse MESSENGER_ROOM_EPOCH_KEY record `%s'\n"),
            s);
 
          GNUNET_free (record);
          return GNUNET_SYSERR;
        }
 
        *data = record;
        *data_size = sizeof(struct GNUNET_MESSENGER_RoomEpochKeyRecord);
        return GNUNET_OK;
      }
    }
  case GNUNET_GNSRECORD_TYPE_MESSENGER_ENCRYPTION_KEY:
    {
      char key[104];
      char nonce[53];
      char encryption_key_length[8];
      char encryption_key_checksum[8];
      char encryption_key[827];
      const char *dash;
      const char *s0;
 
      s0 = s;
      if ((NULL == (dash = strchr (s0, '-'))) ||
          (1 != sscanf (s0, "%826s-", encryption_key)) ||
          (strlen (dash + 1) < 8))
      {
        GNUNET_log (
          GNUNET_ERROR_TYPE_ERROR,
          _ ("Unable to parse MESSENGER_ENCRYPTION_KEY record `%s'\n"),
          s);
 
        return GNUNET_SYSERR;
      }
 
      s0 = dash + 1;
      if ((NULL == (dash = strchr (s0, '-'))) ||
          (1 != sscanf (s0, "%7s-", encryption_key_checksum)) ||
          (strlen (dash + 1) < 8))
      {
        GNUNET_log (
          GNUNET_ERROR_TYPE_ERROR,
          _ ("Unable to parse MESSENGER_ENCRYPTION_KEY record `%s'\n"),
          s);
 
        return GNUNET_SYSERR;
      }
 
      s0 = dash + 1;
      if ((NULL == (dash = strchr (s0, '-'))) ||
          (1 != sscanf (s0, "%7s-", encryption_key_length)) ||
          (strlen (dash + 1) < 53))
      {
        GNUNET_log (
          GNUNET_ERROR_TYPE_ERROR,
          _ ("Unable to parse MESSENGER_ENCRYPTION_KEY record `%s'\n"),
          s);
 
        return GNUNET_SYSERR;
      }
 
      s0 = dash + 1;
      if ((NULL == (dash = strchr (s0, '-'))) ||
          (1 != sscanf (s0, "%52s-", nonce)) ||
          (strlen (dash + 1) != 103))
      {
        GNUNET_log (
          GNUNET_ERROR_TYPE_ERROR,
          _ ("Unable to parse MESSENGER_ENCRYPTION_KEY record `%s'\n"),
          s);
 
        return GNUNET_SYSERR;
      }
 
      GNUNET_memcpy (key, dash + 1, strlen (dash + 1));
      key[103] = '\0';
 
      {
        struct GNUNET_MESSENGER_EncryptionKeyRecord *record = GNUNET_new (
          struct GNUNET_MESSENGER_EncryptionKeyRecord);
 
        if ((GNUNET_OK != GNUNET_STRINGS_string_to_data (
               encryption_key, strlen (encryption_key),
               record->encrypted_key_data,
               sizeof(record->encrypted_key_data)))
            ||
            (GNUNET_OK != GNUNET_STRINGS_string_to_data (
               encryption_key_checksum, strlen (encryption_key_checksum),
               &(record->encrypted_key_checksum),
               sizeof(record->encrypted_key_checksum)))
            ||
            (GNUNET_OK != GNUNET_STRINGS_string_to_data (
               encryption_key_length, strlen (encryption_key_length),
               &(record->encrypted_key_length),
               sizeof(record->encrypted_key_length)))
            ||
            (GNUNET_OK != GNUNET_STRINGS_string_to_data (
               nonce, strlen (nonce),
               record->nonce_data,
               sizeof(record->nonce_data))) ||
            (GNUNET_OK != GNUNET_STRINGS_string_to_data (
               key, strlen (key),
               &(record->key),
               sizeof(struct GNUNET_HashCode))))
        {
          GNUNET_log (
            GNUNET_ERROR_TYPE_ERROR,
            _ ("Unable to parse MESSENGER_ENCRYPTION_KEY record `%s'\n"),
            s);
 
          GNUNET_free (record);
          return GNUNET_SYSERR;
        }
 
        *data = record;
        *data_size = sizeof(struct GNUNET_MESSENGER_EncryptionKeyRecord);
        return GNUNET_OK;
      }
    }
  default:
    return GNUNET_SYSERR;
  }
}
 
 
static struct
{
  const char *name;
  uint32_t number;
} name_map[] = {
  { "MESSENGER_ROOM_ENTRY", GNUNET_GNSRECORD_TYPE_MESSENGER_ROOM_ENTRY },
  { "MESSENGER_ROOM_DETAILS", GNUNET_GNSRECORD_TYPE_MESSENGER_ROOM_DETAILS },
  { "MESSENGER_ROOM_EPOCH_KEY", GNUNET_GNSRECORD_TYPE_MESSENGER_ROOM_EPOCH_KEY }
  ,
  { "MESSENGER_ENCRYPTION_KEY", GNUNET_GNSRECORD_TYPE_MESSENGER_ENCRYPTION_KEY }
  ,
  { NULL, UINT32_MAX }
};
 
 
static uint32_t
messenger_typename_to_number (void *cls,
                              const char *gns_typename)
{
  unsigned int i;
 
  (void) cls;
  i = 0;
  while ((name_map[i].name != NULL) &&
         (0 != strcasecmp (gns_typename, name_map[i].name)))
    i++;
  return name_map[i].number;
}
 
 
static const char *
messenger_number_to_typename (void *cls,
                              uint32_t type)
{
  unsigned int i;
 
  (void) cls;
  i = 0;
  while ((name_map[i].name != NULL) &&
         (type != name_map[i].number))
    i++;
  return name_map[i].name;
}
 
 
void *
libgnunet_plugin_gnsrecord_messenger_init (void *cls);
 
void *
libgnunet_plugin_gnsrecord_messenger_init (void *cls)
{
  struct GNUNET_GNSRECORD_PluginFunctions *api;
 
  (void) cls;
  api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions);
  api->value_to_string = &messenger_value_to_string;
  api->string_to_value = &messenger_string_to_value;
  api->typename_to_number = &messenger_typename_to_number;
  api->number_to_typename = &messenger_number_to_typename;
  return api;
}
 
 
void *
libgnunet_plugin_gnsrecord_messenger_done (void *cls);
 
void *
libgnunet_plugin_gnsrecord_messenger_done (void *cls)
{
  struct GNUNET_GNSRECORD_PluginFunctions *api = cls;
 
  GNUNET_free (api);
  return NULL;
}