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/*
* Copyright 2013 Google Inc.
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* Author: ncardwell@google.com (Neal Cardwell)
*
* TCP connection handling for remote on-the-wire testing using a real NIC.
*/
#ifndef __WIRE_CONN_H__
#define __WIRE_CONN_H__
#include "types.h"
#include "ip_address.h"
#include "wire_protocol.h"
struct config;
/* Buffer holding input or output data for a TCP socket. */
struct wire_conn_buffer {
char *buf; /* malloc-allocated buffer */
int buf_space; /* bytes allocated in malloc-allocated "buf" buffer */
int used; /* bytes of actual data at the start of "buf" */
};
/* A TCP socket used for client<->server communication for doing
* remote on-the-wire testing using a real NIC.
*/
struct wire_conn {
int fd; /* socket for TCP connection (or -1) */
struct wire_conn_buffer in; /* data read in last wire_conn_read() */
};
/* Create a wire_conn. Note that a struct wire_conn shouldn't be
* stack-allocated and should always use wire_conn_new() and
* wire_conn_free().
*/
struct wire_conn *wire_conn_new(void);
/* Free a wire_conn. */
void wire_conn_free(struct wire_conn *conn);
/* Blocking connect. */
void wire_conn_connect(struct wire_conn *conn,
const struct ip_address *ip, u16 port,
enum ip_version_t ip_version);
/* Blocking bind and listen. */
void wire_conn_bind_listen(struct wire_conn *listen_conn, u16 port,
enum ip_version_t ip_version);
/* Blocking accept. */
void wire_conn_accept(struct wire_conn *listen_conn,
struct wire_conn **accepted_conn);
/* Blocking write of a single message. */
int wire_conn_write(struct wire_conn *conn,
enum wire_op_t op,
const void *buf, int buf_len);
/* Blocking read of a single message. Changes *buf to point to the
* wire_conn_buffer of this connection, which is guaranteed to be big
* enough to hold the whole *buf_len bytes returned. The wire_conn
* owns this memory, not the caller. The returned buffer can be
* invalidated (freed or re-written) by the next call to
* wire_conn_read().
*/
int wire_conn_read(struct wire_conn *conn,
enum wire_op_t *op,
void **buf, int *buf_len);
#endif /* __WIRE_CONN_H__ */
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