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/*
* Copyright 2009 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* VMWARE AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "rbug.h"
#include "rbug_internal.h"
#include "util/u_network.h"
struct rbug_connection
{
int socket;
uint32_t send_serial;
uint32_t recv_serial;
enum rbug_opcode opcode;
};
/**
* Create a rbug connection from a socket created with u_socket.
*
* Result:
* A new allocated connection using socket as communication path
*/
struct rbug_connection *
rbug_from_socket(int socket)
{
struct rbug_connection *c = CALLOC_STRUCT(rbug_connection);
c->socket = socket;
return c;
}
/**
* Free a connection, also closes socket.
*/
void
rbug_disconnect(struct rbug_connection *c)
{
u_socket_close(c->socket);
FREE(c);
}
/**
* Waits for a message to be fully received.
* Also returns the serial for the message, serial is not touched for replys.
*
* Result:
* demarshaled message on success, NULL on connection error
*/
struct rbug_header *
rbug_get_message(struct rbug_connection *c, uint32_t *serial)
{
struct rbug_proto_header header;
struct rbug_header *out;
struct rbug_proto_header *data;
size_t length = 0;
size_t read = 0;
int ret;
ret = u_socket_peek(c->socket, &header, sizeof(header));
if (ret <= 0) {
return NULL;
}
length = (size_t)header.length * 4;
data = MALLOC(length);
if (!data) {
return NULL;
}
data->opcode = 0;
do {
uint8_t *ptr = ((uint8_t*)data) + read;
ret = u_socket_recv(c->socket, ptr, length - read);
if (ret <= 0) {
FREE(data);
return NULL;
}
read += ret;
} while(read < length);
out = rbug_demarshal(data);
if (!out)
FREE(data);
else if (serial)
*serial = c->recv_serial++;
else
c->recv_serial++;
return out;
}
/**
* Frees a message and associated data.
*/
void
rbug_free_header(struct rbug_header *header)
{
if (!header)
return;
FREE(header->__message);
FREE(header);
}
/**
* Internal function used by rbug_send_* functions.
*
* Start sending a message.
*/
int
rbug_connection_send_start(struct rbug_connection *c, enum rbug_opcode opcode, uint32_t length)
{
c->opcode = opcode;
return 0;
}
/**
* Internal function used by rbug_send_* functions.
*
* Write data to the socket.
*/
int
rbug_connection_write(struct rbug_connection *c, void *to, uint32_t size)
{
int ret = u_socket_send(c->socket, to, size);
return ret;
}
/**
* Internal function used by rbug_send_* functions.
*
* Finish writing data to the socket.
* Ups the send_serial and sets the serial argument if supplied.
*/
int rbug_connection_send_finish(struct rbug_connection *c, uint32_t *serial)
{
if (c->opcode < 0)
return 0;
else if (serial)
*serial = c->send_serial++;
else
c->send_serial++;
return 0;
}
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