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/** @addtogroup MCD_MCDIMPL_DAEMON_SRV
* @{
* @file
*
* Connection data.
*
* <!-- Copyright Giesecke & Devrient GmbH 2009 - 2012 -->
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef CONNECTION_H_
#define CONNECTION_H_
#include <linux/semaphore.h>
#include <stddef.h>
#include <stdbool.h>
#define MAX_PAYLOAD_SIZE 128
struct connection {
struct sock *socket_descriptor; /**< Netlink socket */
uint32_t sequence_magic; /**< Random? magic to match requests/answers */
struct nlmsghdr *data_msg;
uint32_t data_len; /**< How much connection data is left */
void *data_start; /**< Start pointer of remaining data */
struct sk_buff *skb;
struct mutex data_lock; /**< Data protection lock */
struct semaphore data_available_sem; /**< Data protection semaphore */
pid_t self_pid; /**< PID address used for local connection */
pid_t peer_pid; /**< Remote PID for connection */
struct list_head list; /**< The list param for using the kernel lists*/
};
struct connection *connection_new(
void
);
struct connection *connection_create(
int socket_descriptor,
pid_t dest
);
void connection_cleanup(
struct connection *conn
);
/**
* Connect to destination.
*
* @param Destination pointer.
* @return true on success.
*/
bool connection_connect(
struct connection *conn,
pid_t dest
);
/**
* Read bytes from the connection.
*
* @param buffer Pointer to destination buffer.
* @param len Number of bytes to read.
* @return Number of bytes read.
*/
size_t connection_read_datablock(
struct connection *conn,
void *buffer,
uint32_t len
);
/**
* Read bytes from the connection.
*
* @param buffer Pointer to destination buffer.
* @param len Number of bytes to read.
* @param timeout Timeout in milliseconds
* @return Number of bytes read.
* @return -1 if select() failed (returned -1)
* @return -2 if no data available, i.e. timeout
*/
size_t connection_read_data(
struct connection *conn,
void *buffer,
uint32_t len,
int32_t timeout
);
/**
* Write bytes to the connection.
*
* @param buffer Pointer to source buffer.
* @param len Number of bytes to read.
* @return Number of bytes written.
*/
size_t connection_write_data(
struct connection *conn,
void *buffer,
uint32_t len
);
/**
* Write bytes to the connection.
*
* @param buffer Pointer to source buffer.
* @param len Number of bytes to read.
* @return Number of bytes written.
*/
int connection_process(
struct connection *conn,
struct sk_buff *skb
);
#endif /* CONNECTION_H_ */
/** @} */
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