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/** @addtogroup MCD_MCDIMPL_DAEMON_SRV
* @{
* @file
*
* Connection data.
*
* <!-- Copyright Giesecke & Devrient GmbH 2009 - 2011 -->
*/
#ifndef CONNECTION_H_
#define CONNECTION_H_
#include <linux/semaphore.h>
#include <stddef.h>
#include <stdbool.h>
#define MAX_PAYLOAD_SIZE 128
typedef struct {
struct sock *socketDescriptor; /**< Netlink socket */
uint32_t sequenceMagic; /**< Random? magic to match requests/answers */
struct nlmsghdr *dataMsg;
uint32_t dataLen; /**< How much connection data is left */
void *dataStart; /**< Start pointer of remaining data */
struct sk_buff *skb;
struct semaphore dataSem; /**< Data protection semaphore */
struct semaphore dataAvailableSem; /**< Data protection semaphore */
pid_t selfPid; /**< PID address used for local connection */
pid_t peerPid; /**< Remote PID for connection */
struct list_head list; /**< The list param for using the kernel lists*/
} connection_t;
connection_t* connection_new(
void
);
connection_t* connection_create(
int socketDescriptor,
pid_t dest
);
void connection_cleanup(
connection_t *conn
);
/**
* Connect to destination.
*
* @param Destination pointer.
* @return true on success.
*/
bool connection_connect(
connection_t *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_readDataBlock(
connection_t *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_readData(
connection_t *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_writeData(
connection_t *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(
connection_t *conn,
struct sk_buff *skb
);
typedef struct list_head connectionVector_t;
#endif /* CONNECTION_H_ */
/** @} */
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