154 lines
2.6 KiB
C
154 lines
2.6 KiB
C
/**
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* @file gateway.c
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*
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* @brief Implementation of gateway_t.
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*
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*/
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/*
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* Copyright (C) 2007 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "gateway.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <string.h>
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typedef struct private_gateway_t private_gateway_t;
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/**
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* private data of gateway
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*/
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struct private_gateway_t {
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/**
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* public functions
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*/
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gateway_t public;
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/**
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* name of the gateway
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*/
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char *name;
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/**
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* connection information
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*/
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host_t *host;
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/**
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* socket file descriptor, > 0 if connected
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*/
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int fd;
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};
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/**
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* establish connection to gateway
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*/
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static bool connect_(private_gateway_t *this)
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{
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if (this->fd >= 0)
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{
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close(this->fd);
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}
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this->fd = socket(AF_INET, SOCK_STREAM, 0);
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if (this->fd < 0)
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{
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return FALSE;
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}
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if (connect(this->fd, this->host->get_sockaddr(this->host),
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*this->host->get_sockaddr_len(this->host)) != 0)
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{
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close(this->fd);
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this->fd = -1;
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return FALSE;
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}
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return TRUE;
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}
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/**
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* Implementation of gateway_t.request.
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*/
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static char* request(private_gateway_t *this, char *xml)
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{
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if (this->fd < 0)
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{
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if (!connect_(this))
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{
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return NULL;
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}
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}
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while (TRUE)
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{
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char buf[8096];
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ssize_t len;
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len = strlen(xml);
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if (send(this->fd, xml, len, 0) != len)
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{
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return NULL;
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}
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len = recv(this->fd, buf, sizeof(buf) - 1, 0);
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if (len < 0)
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{
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return NULL;
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}
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if (len == 0)
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{
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if (!connect_(this))
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{
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return NULL;
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}
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continue;
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}
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buf[len] = 0;
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return strdup(buf);
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}
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}
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/**
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* Implementation of gateway_t.destroy
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*/
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static void destroy(private_gateway_t *this)
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{
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if (this->fd >= 0)
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{
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close(this->fd);
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}
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this->host->destroy(this->host);
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free(this->name);
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free(this);
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}
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/*
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* see header file
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*/
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gateway_t *gateway_create(char *name, host_t *host)
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{
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private_gateway_t *this = malloc_thing(private_gateway_t);
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this->public.request = (char*(*)(gateway_t*, char *xml))request;
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this->public.destroy = (void(*)(gateway_t*))destroy;
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this->name = strdup(name);
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this->host = host;
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this->fd = -1;
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return &this->public;
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}
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