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/*
* libioth: choose your networking library as a plugin at run time.
*
* Copyright (C) 2022 Renzo Davoli <renzo@cs.unibo.it> VirtualSquare team.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <string.h>
#define SPDX_PREFIX "SPDX-License-Identifier: "
#define SPDX_PREFIXLEN (sizeof(SPDX_PREFIX) - 1)
/* This implementation manages only a small subset of possible license
* combinations. */
int checklicense(const char *prglicense, const char *liblicense) {
/* No lib license restrictions: ok to load */
if (liblicense == NULL) return 1;
if (strncmp(liblicense, SPDX_PREFIX, SPDX_PREFIXLEN) == 0)
liblicense += SPDX_PREFIXLEN;
/* It is a permissive library */
if (strncasecmp(liblicense, "LGPL-", 5) == 0)
return 1;
/* Lib has requirements, no license spec from prg -> deny */
if (prglicense == NULL) return 0;
if (strncmp(prglicense, SPDX_PREFIX, SPDX_PREFIXLEN) == 0)
prglicense += SPDX_PREFIXLEN;
/* It is the very same license: OK */
if (strcasecmp(prglicense, liblicense) == 0) return 1;
if (strcasecmp(liblicense, "GPL-2.0-or-later") == 0) {
if (strcasecmp(prglicense, "GPL-2.0-only") == 0 ||
strcasecmp(prglicense, "GPL-3.0-only") == 0 ||
strcasecmp(prglicense, "GPL-2.0-or-later") == 0 ||
strcasecmp(prglicense, "GPL-3.0-or-later") == 0)
return 1;
return 0;
}
if (strcasecmp(liblicense, "GPL-3.0-or-later") == 0) {
if (strcasecmp(prglicense, "GPL-3.0-only") == 0 ||
strcasecmp(prglicense, "GPL-3.0-or-later") == 0)
return 1;
return 0;
}
if (strcasecmp(liblicense, "GPL-2.0-only OR GPL-3.0-only") == 0) {
if (strcasecmp(prglicense, "GPL-2.0-only") == 0 ||
strcasecmp(prglicense, "GPL-3.0-only") == 0 ||
strcasecmp(prglicense, "GPL-2.0-or-later") == 0 ||
strcasecmp(prglicense, "GPL-3.0-or-later") == 0)
return 1;
return 0;
}
/* in doubt deny */
return 0;
}
#if 0
int main(int argc, char *argv[]) {
printf("%d\n", licensecheck(argv[1], argv[2]));
}
#endif
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