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/**
* @file gateway.c
*
* @brief Implementation of gateway_t.
*
*/
/*
* Copyright (C) 2007 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "gateway.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <string.h>
typedef struct private_gateway_t private_gateway_t;
/**
* private data of gateway
*/
struct private_gateway_t {
/**
* public functions
*/
gateway_t public;
/**
* name of the gateway
*/
char *name;
/**
* connection information
*/
host_t *host;
/**
* socket file descriptor, > 0 if connected
*/
int fd;
};
/**
* establish connection to gateway
*/
static bool connect_(private_gateway_t *this)
{
if (this->fd >= 0)
{
close(this->fd);
}
this->fd = socket(AF_INET, SOCK_STREAM, 0);
if (this->fd < 0)
{
return FALSE;
}
if (connect(this->fd, this->host->get_sockaddr(this->host),
*this->host->get_sockaddr_len(this->host)) != 0)
{
close(this->fd);
this->fd = -1;
return FALSE;
}
return TRUE;
}
/**
* Implementation of gateway_t.request.
*/
static char* request(private_gateway_t *this, char *xml)
{
if (this->fd < 0)
{
if (!connect_(this))
{
return NULL;
}
}
while (TRUE)
{
char buf[8096];
ssize_t len;
len = strlen(xml);
if (send(this->fd, xml, len, 0) != len)
{
return NULL;
}
len = recv(this->fd, buf, sizeof(buf) - 1, 0);
if (len < 0)
{
return NULL;
}
if (len == 0)
{
if (!connect_(this))
{
return NULL;
}
continue;
}
buf[len] = 0;
return strdup(buf);
}
}
/**
* Implementation of gateway_t.destroy
*/
static void destroy(private_gateway_t *this)
{
if (this->fd >= 0)
{
close(this->fd);
}
this->host->destroy(this->host);
free(this->name);
free(this);
}
/*
* see header file
*/
gateway_t *gateway_create(char *name, host_t *host)
{
private_gateway_t *this = malloc_thing(private_gateway_t);
this->public.request = (char*(*)(gateway_t*, char *xml))request;
this->public.destroy = (void(*)(gateway_t*))destroy;
this->name = strdup(name);
this->host = host;
this->fd = -1;
return &this->public;
}
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