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/*
This file is part of GNU Taler
Copyright (C) 2021 Taler Systems SA
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see
<http://www.gnu.org/licenses/>
*/
/**
* @file util/secmod_common.h
* @brief Common functions for the exchange security modules
* @author Florian Dold <dold@taler.net>
*/
#ifndef SECMOD_COMMON_H
#define SECMOD_COMMON_H
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_network_lib.h>
#include <pthread.h>
/**
* Create the listen socket for a secmod daemon.
*
* This function is not thread-safe, as it changes and
* restores the process umask.
*
* @param unixpath socket path
*/
struct GNUNET_NETWORK_Handle *
TES_open_socket (const char *unixpath);
/**
* Send a message starting with @a hdr to @a sock.
*
* @param sock where to send the message
* @param hdr beginning of the message, length indicated in size field
* @return #GNUNET_OK on success
*/
enum GNUNET_GenericReturnValue
TES_transmit (int sock,
const struct GNUNET_MessageHeader *hdr);
/**
* Information we keep for a client connected to us.
*/
struct TES_Client;
/**
* Function that handles message @a hdr from @a client.
*
* @param client sender of the message
* @param hdr message we received
* @return #GNUNET_OK on success
*/
typedef enum GNUNET_GenericReturnValue
(*TES_MessageDispatch)(struct TES_Client *client,
const struct GNUNET_MessageHeader *hdr);
/**
* Function that updates the keys for @a client.
*
* @param client sender of the message
* @return #GNUNET_OK on success
*/
typedef enum GNUNET_GenericReturnValue
(*TES_KeyUpdater)(struct TES_Client *client);
/**
* Module-specific functions to be used.
*/
struct TES_Callbacks
{
/**
* Function to handle inbound messages.
*/
TES_MessageDispatch dispatch;
/**
* Function to update key material initially.
*/
TES_KeyUpdater init;
/**
* Function to update key material.
*/
TES_KeyUpdater updater;
};
/**
* Information we keep for a client connected to us.
*/
struct TES_Client
{
/**
* Kept in a DLL.
*/
struct TES_Client *next;
/**
* Kept in a DLL.
*/
struct TES_Client *prev;
/**
* Callbacks to use for work.
*/
struct TES_Callbacks cb;
/**
* Worker thread for this client.
*/
pthread_t worker;
/**
* Key generation this client is on.
*/
uint64_t key_gen;
/**
* IO-buffer used by @a purpose.
*/
char iobuf[65536];
/**
* Client socket.
*/
int csock;
/**
* Event socket.
*/
int esock;
};
/**
* Head of DLL of clients connected to us.
*/
extern struct TES_Client *TES_clients_head;
/**
* Tail of DLL of clients connected to us.
*/
extern struct TES_Client *TES_clients_tail;
/**
* Lock for the client queue.
*/
extern pthread_mutex_t TES_clients_lock;
/**
* Private key of this security module. Used to sign denomination key
* announcements.
*/
extern struct TALER_SecurityModulePrivateKeyP TES_smpriv;
/**
* Public key of this security module.
*/
extern struct TALER_SecurityModulePublicKeyP TES_smpub;
/**
* Send a signal to all clients to notify them about a key generation change.
*/
void
TES_wake_clients (void);
/**
* Read work request from the client.
*
* @param cls a `struct TES_Client *`
* @param dispatch function to call with work requests received
* @return #GNUNET_OK on success
*/
enum GNUNET_GenericReturnValue
TES_read_work (void *cls,
TES_MessageDispatch dispatch);
/**
* Wait until the socket is ready to read.
*
* @param client the client to wait for
* @return true if we received an event
*/
bool
TES_await_ready (struct TES_Client *client);
/**
* Free resources occupied by @a client.
*
* @param[in] client resources to release
*/
void
TES_free_client (struct TES_Client *client);
/**
* Start listen task.
*
* @param cfg configuration to use
* @param section configuration section to use
* @param cb callback functions to use
* @return 0 on success, otherwise return value to return from main()
*/
int
TES_listen_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *section,
const struct TES_Callbacks *cb);
/**
* Stop listen task.
*/
void
TES_listen_stop (void);
#endif
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