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/*
* Copyright (C) 2015 Michael Petch <mpetch@capp-sysware.com>
*
* 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 3 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* $Id: randomorg.c,v 1.8 2020/08/25 17:29:27 plm Exp $
*/
#include "config.h"
#if defined(LIBCURL_PROTOCOL_HTTPS)
#include <ctype.h>
#include <curl/curl.h>
#include "backgammon.h"
#include "randomorg.h"
/*
* Fetch random numbers from www.random.org
*/
static size_t
RandomOrgCallBack(void *pvRawData, size_t nSize, size_t nNumMemb, void *pvUserData)
{
size_t nNewDataLen = nSize * nNumMemb;
RandomData *pvRandomData = (RandomData *) pvUserData;
unsigned int i;
size_t iNumRead = pvRandomData->nNumRolls;
char *szRawData = (char *) pvRawData;
#if defined(RANDOMORG_DEBUG)
int count = 0;
if (iNumRead > 0)
outputl("");
output("Random rolls received:");
#endif
for (i = 0; i < nNewDataLen; i++) {
if (iNumRead >= BUFLENGTH) {
/* Prevent buffer overflow if random.org sent more than we asked */
break;
}
if ((szRawData[i] >= '0') && (szRawData[i] <= '5')) {
/* Get a number */
pvRandomData->anBuf[iNumRead] = 1 + (unsigned int) (szRawData[i] - '0');
#if defined(RANDOMORG_DEBUG)
if (count++ % 100 == 0)
outputl("");
outputf("%d", pvRandomData->anBuf[iNumRead]);
#endif
iNumRead++;
} else if (isspace(szRawData[i])) {
/* Skip white space */
continue;
} else {
/* Any other characters suggest invalid data
* exit with error (0) */
return 0;
}
}
pvRandomData->nNumRolls = iNumRead;
return nNewDataLen;
}
static RandomData randomData = { 0, -1, {0} };
unsigned int
getDiceRandomDotOrg(void)
{
CURL *curl_handle;
CURLcode nRetVal;
#if defined(WIN32)
gchar *szWIN32_cert_path = NULL;
#endif
if ((randomData.nCurrent >= 0) && ((unsigned int) randomData.nCurrent < randomData.nNumRolls)) {
return randomData.anBuf[randomData.nCurrent++];
}
randomData.nNumRolls = 0;
outputf(_("Fetching %d random numbers from <%s>\n"), BUFLENGTH, RANDOMORGSITE);
outputx();
/* Initialize the curl session */
curl_handle = curl_easy_init();
#if defined(WIN32)
/* Set location of certificate bundle */
szWIN32_cert_path = g_build_filename(RANDOMORG_CERTPATH, RANDOMORG_CABUNDLE, NULL);
curl_easy_setopt(curl_handle, CURLOPT_CAINFO, szWIN32_cert_path);
#endif
#if defined(RANDOMORG_DEBUG)
curl_easy_setopt(curl_handle, CURLOPT_VERBOSE, 1L);
#endif
curl_easy_setopt(curl_handle, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl_handle, CURLOPT_URL, RANDOMORG_URL);
curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, RandomOrgCallBack);
curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *) &randomData);
curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, RANDOMORG_USERAGENT);
nRetVal = curl_easy_perform(curl_handle);
#if defined(RANDOMORG_DEBUG)
outputf("\n\n");
#endif
#if defined(WIN32)
g_free(szWIN32_cert_path);
#endif
/* check if an error condition exists */
if (nRetVal != CURLE_OK) {
curl_easy_cleanup(curl_handle);
outputerrf("curl_easy_perform() failed: %s\n", curl_easy_strerror(nRetVal));
randomData.nCurrent = -1;
return 0;
}
/* Cleanup curl session */
curl_easy_cleanup(curl_handle);
randomData.nCurrent = 1;
return randomData.anBuf[0];
}
#endif
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