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/*
* Copyright (C) 2008 Martin Willi
* Copyright (C) 2007 Andreas Steffen
* 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 <curl/curl.h>
#include <library.h>
#include <debug.h>
#include "curl_fetcher.h"
#define DEFAULT_TIMEOUT 10
typedef struct private_curl_fetcher_t private_curl_fetcher_t;
/**
* private data of a curl_fetcher_t object.
*/
struct private_curl_fetcher_t {
/**
* Public data
*/
curl_fetcher_t public;
/**
* CURL handle
*/
CURL* curl;
/**
* Optional HTTP headers
*/
struct curl_slist *headers;
};
/**
* writes data into a dynamically resizeable chunk_t
*/
static size_t append(void *ptr, size_t size, size_t nmemb, chunk_t *data)
{
size_t realsize = size * nmemb;
data->ptr = (u_char*)realloc(data->ptr, data->len + realsize);
if (data->ptr)
{
memcpy(&data->ptr[data->len], ptr, realsize);
data->len += realsize;
}
return realsize;
}
/**
* Implements fetcher_t.fetch.
*/
static status_t fetch(private_curl_fetcher_t *this, char *uri, chunk_t *result)
{
char error[CURL_ERROR_SIZE];
status_t status;
*result = chunk_empty;
if (curl_easy_setopt(this->curl, CURLOPT_URL, uri) != CURLE_OK)
{ /* URL type not supported by curl */
return NOT_SUPPORTED;
}
curl_easy_setopt(this->curl, CURLOPT_ERRORBUFFER, error);
curl_easy_setopt(this->curl, CURLOPT_FAILONERROR, TRUE);
curl_easy_setopt(this->curl, CURLOPT_NOSIGNAL, TRUE);
curl_easy_setopt(this->curl, CURLOPT_CONNECTTIMEOUT, DEFAULT_TIMEOUT);
curl_easy_setopt(this->curl, CURLOPT_WRITEFUNCTION, (void*)append);
curl_easy_setopt(this->curl, CURLOPT_WRITEDATA, (void*)result);
if (this->headers)
{
curl_easy_setopt(this->curl, CURLOPT_HTTPHEADER, this->headers);
}
DBG2(" sending http request to '%s'...", uri);
switch (curl_easy_perform(this->curl))
{
case CURLE_UNSUPPORTED_PROTOCOL:
status = NOT_SUPPORTED;
break;
case CURLE_OK:
status = SUCCESS;
break;
default:
DBG1("libcurl http request failed: %s", error);
status = FAILED;
break;
}
return status;
}
/**
* Implementation of fetcher_t.set_option.
*/
static bool set_option(private_curl_fetcher_t *this, fetcher_option_t option, ...)
{
va_list args;
va_start(args, option);
switch (option)
{
case FETCH_REQUEST_DATA:
{
chunk_t data = va_arg(args, chunk_t);
curl_easy_setopt(this->curl, CURLOPT_POSTFIELDS, (char*)data.ptr);
curl_easy_setopt(this->curl, CURLOPT_POSTFIELDSIZE, data.len);
return TRUE;
}
case FETCH_REQUEST_TYPE:
{
char header[BUF_LEN];
char *request_type = va_arg(args, char*);
snprintf(header, BUF_LEN, "Content-Type: %s", request_type);
this->headers = curl_slist_append(this->headers, header);
return TRUE;
}
case FETCH_REQUEST_HEADER:
{
char *header = va_arg(args, char*);
this->headers = curl_slist_append(this->headers, header);
return TRUE;
}
case FETCH_HTTP_VERSION_1_0:
{
curl_easy_setopt(this->curl, CURLOPT_HTTP_VERSION,
CURL_HTTP_VERSION_1_0);
return TRUE;
}
case FETCH_TIMEOUT:
{
curl_easy_setopt(this->curl, CURLOPT_CONNECTTIMEOUT,
va_arg(args, u_int));
return TRUE;
}
default:
return FALSE;
}
}
/**
* Implements fetcher_t.destroy
*/
static void destroy(private_curl_fetcher_t *this)
{
curl_slist_free_all(this->headers);
curl_easy_cleanup(this->curl);
free(this);
}
/*
* Described in header.
*/
curl_fetcher_t *curl_fetcher_create()
{
private_curl_fetcher_t *this = malloc_thing(private_curl_fetcher_t);
this->curl = curl_easy_init();
if (this->curl == NULL)
{
free(this);
return NULL;
}
this->headers = NULL;
this->public.interface.fetch = (status_t(*)(fetcher_t*,char*,chunk_t*))fetch;
this->public.interface.set_option = (bool(*)(fetcher_t*, fetcher_option_t option, ...))set_option;
this->public.interface.destroy = (void (*)(fetcher_t*))destroy;
return &this->public;
}
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