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/*
* Copyright (C) 2015, 2016 "IoT.bzh"
* Author: José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _GNU_SOURCE
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <curl/curl.h>
#include "curl-wrap.h"
#include "escape.h"
/* internal representation of buffers */
struct buffer {
size_t size;
char *data;
};
/* write callback for filling buffers with the response */
static size_t write_callback(char *ptr, size_t size, size_t nmemb, void *userdata)
{
struct buffer *buffer = userdata;
size_t sz = size * nmemb;
size_t old_size = buffer->size;
size_t new_size = old_size + sz;
char *data = realloc(buffer->data, new_size + 1);
if (!data)
return 0;
memcpy(&data[old_size], ptr, sz);
data[new_size] = 0;
buffer->size = new_size;
buffer->data = data;
return sz;
}
/*
* Perform the CURL operation for 'curl' and put the result in
* memory. If 'result' isn't NULL it receives the returned content
* that then must be freed. If 'size' isn't NULL, it receives the
* size of the returned content. Note that if not NULL, the real
* content is one byte greater than the read size and the last byte
* zero. This facility allows to handle the returned content as a
* null terminated C-string.
*/
int curl_wrap_perform(CURL *curl, char **result, size_t *size)
{
int rc;
struct buffer buffer;
CURLcode code;
/* init tthe buffer */
buffer.size = 0;
buffer.data = NULL;
/* Perform the request, res will get the return code */
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
/* Perform the request, res will get the return code */
code = curl_easy_perform(curl);
rc = code == CURLE_OK;
/* Check for no errors */
if (rc) {
/* no error */
if (size)
*size = buffer.size;
if (result)
*result = buffer.data;
else
free(buffer.data);
} else {
/* had error */
if (size)
*size = 0;
if (result)
*result = NULL;
free(buffer.data);
}
return rc;
}
void curl_wrap_do(CURL *curl, void (*callback)(void *closure, int status, CURL *curl, const char *result, size_t size), void *closure)
{
int rc;
char *result;
size_t size;
char errbuf[CURL_ERROR_SIZE];
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errbuf);
rc = curl_wrap_perform(curl, &result, &size);
if (rc)
callback(closure, rc, curl, result, size);
else
callback(closure, rc, curl, errbuf, 0);
free(result);
curl_easy_cleanup(curl);
}
int curl_wrap_content_type_is(CURL *curl, const char *value)
{
char *actual;
CURLcode code;
code = curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &actual);
if (code != CURLE_OK || !actual)
return 0;
return !strncasecmp(actual, value, strcspn(actual, "; "));
}
CURL *curl_wrap_prepare_get_url(const char *url)
{
CURL *curl;
CURLcode code;
curl = curl_easy_init();
if(curl) {
code = curl_easy_setopt(curl, CURLOPT_URL, url);
if (code == CURLE_OK)
return curl;
curl_easy_cleanup(curl);
}
return NULL;
}
CURL *curl_wrap_prepare_get(const char *base, const char *path, const char * const *args)
{
CURL *res;
char *url;
url = escape_url(base, path, args, NULL);
res = url ? curl_wrap_prepare_get_url(url) : NULL;
free(url);
return res;
}
int curl_wrap_add_header(CURL *curl, const char *header)
{
int rc;
struct curl_slist *list;
list = curl_slist_append(NULL, header);
rc = list ? curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list) == CURLE_OK : 0;
/*
curl_slist_free_all(list);
*/
return rc;
}
int curl_wrap_add_header_value(CURL *curl, const char *name, const char *value)
{
char *h;
int rc;
size_t sname, svalue;
sname = strlen(name);
svalue = strlen(value);
h = alloca(sname + svalue + 3);
memcpy(h, name, sname);
h[sname] = ':';
h[sname + 1] = ' ';
memcpy(h + sname + 2, value, svalue + 1);
rc = curl_wrap_add_header(curl, h);
return rc;
}
CURL *curl_wrap_prepare_post_url_data(const char *url, const char *datatype, const char *data, size_t szdata)
{
CURL *curl;
curl = curl_easy_init();
if (curl
&& CURLE_OK == curl_easy_setopt(curl, CURLOPT_URL, url)
&& (!szdata || CURLE_OK == curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, szdata))
&& CURLE_OK == curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data)
&& (!datatype || curl_wrap_add_header_value(curl, "content-type", datatype)))
return curl;
curl_easy_cleanup(curl);
return NULL;
}
CURL *curl_wrap_prepare_post(const char *base, const char *path, const char * const *args)
{
CURL *res;
char *url;
char *data;
size_t szdata;
url = escape_url(base, path, NULL, NULL);
data = escape_args(args, &szdata);
res = url ? curl_wrap_prepare_post_url_data(url, NULL, data, szdata) : NULL;
free(url);
return res;
}
/* vim: set colorcolumn=80: */
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