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a487cd4f8f
Not all C libraries are glibc, or impersonating it; for example, musl does not pretend to be any version of glibc. Thus, building on musl fails when openssl is disabled, because no random-providing function is detected, although musl does provide getrandom(). uClibc-ng on the other hand, can impersonate glibc, but availability of getrandom() is not guatranteed there: getrandom() can be compiled out of uClinbc-ng, or uClibc-ng can be too old to have it. Add a configure-time check that getrandom() is available, as a fallback when TLS is not enabled (and thus openssl is not used), and when not on Win32 (where getting random numbers is always possible, at least from a build perspective). However, building with the plain Makefiles should keep working, so slightly rework the defines checks in the code to account for the fact that HAVE_GETRANDOM may already be defined at configure time. Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/*
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Copyright (c) 2009-2021 Roger Light <roger@atchoo.org>
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All rights reserved. This program and the accompanying materials
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are made available under the terms of the Eclipse Public License 2.0
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and Eclipse Distribution License v1.0 which accompany this distribution.
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The Eclipse Public License is available at
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https://www.eclipse.org/legal/epl-2.0/
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and the Eclipse Distribution License is available at
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http://www.eclipse.org/org/documents/edl-v10.php.
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SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
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Contributors:
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Roger Light - initial implementation and documentation.
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*/
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#include "config.h"
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#include <stdlib.h> /* Keep this here to allow glibc detection */
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#ifdef WIN32
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# include <winsock2.h>
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# include <aclapi.h>
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# include <io.h>
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# include <lmcons.h>
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#endif
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#ifdef WITH_TLS
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# include <openssl/bn.h>
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# include <openssl/rand.h>
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#elif defined(HAVE_GETRANDOM) /* From CMakeLists.txt */
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# include <sys/random.h>
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#elif defined(__linux__) && defined(__GLIBC__) /* For legacy Makefiles */
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# if __GLIBC_PREREQ(2, 25)
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# include <sys/random.h>
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# define HAVE_GETRANDOM 1
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# endif
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#endif
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#include "mosquitto.h"
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int mosquitto_getrandom(void *bytes, int count)
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{
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int rc = MOSQ_ERR_UNKNOWN;
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#ifdef WITH_TLS
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if(RAND_bytes(bytes, count) == 1){
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rc = MOSQ_ERR_SUCCESS;
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}
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#elif defined(HAVE_GETRANDOM)
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if(getrandom(bytes, (size_t)count, 0) == count){
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rc = MOSQ_ERR_SUCCESS;
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}
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#elif defined(WIN32)
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HCRYPTPROV provider;
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if(!CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)){
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return MOSQ_ERR_UNKNOWN;
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}
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if(CryptGenRandom(provider, count, bytes)){
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rc = MOSQ_ERR_SUCCESS;
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}
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CryptReleaseContext(provider, 0);
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#else /* For legacy Makefiles */
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# error "No suitable random function found."
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#endif
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return rc;
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}
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