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/* fmhttp.c
* This is a function module for http functions.
*
* File begun on 2018-03-16 by JGerhards
*
* Copyright 2010-2018 Rainer Gerhards, Jan Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* 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
* -or-
* see COPYING.ASL20 in the source distribution
*
* 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.
*/
#include "config.h"
#include "rsyslog.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <ctype.h>
#include <curl/curl.h>
#include "errmsg.h"
#include "conf.h"
#include "syslogd-types.h"
#include "template.h"
#include "msg.h"
#include "parserif.h"
#include "module-template.h"
#include "rainerscript.h"
#include "unicode-helper.h"
MODULE_TYPE_FUNCTION
MODULE_TYPE_NOKEEP
DEF_FMOD_STATIC_DATA
struct curl_funcData {
const char *reply;
size_t replyLen;
};
/* curl callback for doFunc_http_request */
static size_t
curlResult(void *ptr, size_t size, size_t nmemb, void *userdata)
{
char *buf;
size_t newlen;
struct cnffunc *const func = (struct cnffunc *) userdata;
assert(func != NULL);
struct curl_funcData *const curlData = (struct curl_funcData*) func->funcdata;
assert(curlData != NULL);
if(ptr == NULL) {
LogError(0, RS_RET_ERR, "internal error: libcurl provided ptr=NULL");
return 0;
}
newlen = curlData->replyLen + size*nmemb;
if((buf = realloc((void*)curlData->reply, newlen + 1)) == NULL) {
LogError(errno, RS_RET_ERR, "rainerscript: realloc failed in curlResult");
return 0; /* abort due to failure */
}
memcpy(buf+curlData->replyLen, (char*)ptr, size*nmemb);
curlData->replyLen = newlen;
curlData->reply = buf;
return size*nmemb;
}
static void ATTR_NONNULL()
doFunc_http_request(struct cnffunc *__restrict__ const func,
struct svar *__restrict__ const ret,
void *__restrict__ const usrptr,
wti_t *__restrict__ const pWti)
{
struct svar srcVal;
int bMustFree;
cnfexprEval(func->expr[0], &srcVal, usrptr, pWti);
char *url = (char*) var2CString(&srcVal, &bMustFree);
int resultSet = 0;
CURL *handle = NULL;
CURLcode res;
assert(func != NULL);
struct curl_funcData *const curlData = (struct curl_funcData*) func->funcdata;
assert(curlData != NULL);
rsRetVal iRet __attribute__((unused)) = RS_RET_OK;
CHKmalloc(handle = curl_easy_init());
curl_easy_setopt(handle, CURLOPT_NOSIGNAL, TRUE);
curl_easy_setopt(handle, CURLOPT_WRITEFUNCTION, curlResult);
curl_easy_setopt(handle, CURLOPT_WRITEDATA, func);
curl_easy_setopt(handle, CURLOPT_URL, url);
res = curl_easy_perform(handle);
if(res != CURLE_OK) {
LogError(0, RS_RET_IO_ERROR,
"rainerscript: http_request to failed, URL: '%s', error %s",
url, curl_easy_strerror(res));
ABORT_FINALIZE(RS_RET_OK);
}
CHKmalloc(ret->d.estr = es_newStrFromCStr(curlData->reply, curlData->replyLen));
ret->datatype = 'S';
resultSet = 1;
finalize_it:
free((void*)curlData->reply);
curlData->reply = NULL;
curlData->replyLen = 0;
if(handle != NULL) {
curl_easy_cleanup(handle);
}
if(!resultSet) {
/* provide dummy value */
ret->d.n = 0;
ret->datatype = 'N';
}
if(bMustFree) {
free(url);
}
varFreeMembers(&srcVal);
}
static rsRetVal ATTR_NONNULL(1)
initFunc_http_request(struct cnffunc *const func)
{
DEFiRet;
func->destructable_funcdata = 1;
CHKmalloc(func->funcdata = calloc(1, sizeof(struct curl_funcData)));
if(func->nParams != 1) {
parser_errmsg("rsyslog logic error in line %d of file %s\n",
__LINE__, __FILE__);
FINALIZE;
}
finalize_it:
RETiRet;
}
static void ATTR_NONNULL(1)
destructFunc_http_request(struct cnffunc *const func)
{
if(func->funcdata != NULL) {
free((void*) ((struct curl_funcData*)func->funcdata)->reply);
}
}
static struct scriptFunct functions[] = {
{"http_request", 1, 1, doFunc_http_request, initFunc_http_request, destructFunc_http_request},
{NULL, 0, 0, NULL, NULL, NULL} //last element to check end of array
};
BEGINgetFunctArray
CODESTARTgetFunctArray
*version = 1;
*functArray = functions;
ENDgetFunctArray
BEGINmodExit
CODESTARTmodExit
ENDmodExit
BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_FMOD_QUERIES
ENDqueryEtryPt
BEGINmodInit()
CODESTARTmodInit
*ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */
CODEmodInit_QueryRegCFSLineHdlr
dbgprintf("rsyslog fmhttp init called, compiled with version %s\n", VERSION);
ENDmodInit
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