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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* libcryptsetup API log example
*
* Copyright (C) 2011-2025 Red Hat, Inc. All rights reserved.
*/
#include <stdio.h>
#include <sys/types.h>
#include <syslog.h>
#include <unistd.h>
#include <libcryptsetup.h>
/*
* This is an example of crypt_set_log_callback API callback.
*
*/
static void simple_syslog_wrapper(int level, const char *msg, void *usrptr)
{
const char *prefix = (const char *)usrptr;
int priority;
switch(level) {
case CRYPT_LOG_NORMAL: priority = LOG_NOTICE; break;
case CRYPT_LOG_ERROR: priority = LOG_ERR; break;
case CRYPT_LOG_VERBOSE: priority = LOG_INFO; break;
case CRYPT_LOG_DEBUG: priority = LOG_DEBUG; break;
default:
fprintf(stderr, "Unsupported log level requested!\n");
return;
}
if (prefix)
syslog(priority, "%s:%s", prefix, msg);
else
syslog(priority, "%s", msg);
}
int main(void)
{
struct crypt_device *cd;
char usrprefix[] = "cslog_example";
int r;
if (geteuid()) {
printf("Using of libcryptsetup requires super user privileges.\n");
return 1;
}
openlog("cryptsetup", LOG_CONS | LOG_PID, LOG_USER);
/* Initialize empty crypt device context */
r = crypt_init(&cd, NULL);
if (r < 0) {
printf("crypt_init() failed.\n");
return 2;
}
/* crypt_set_log_callback() - register a log callback for crypt context */
crypt_set_log_callback(cd, &simple_syslog_wrapper, (void *)usrprefix);
/* send messages ithrough the crypt_log() interface */
crypt_log(cd, CRYPT_LOG_NORMAL, "This is normal log message");
crypt_log(cd, CRYPT_LOG_ERROR, "This is error log message");
crypt_log(cd, CRYPT_LOG_VERBOSE, "This is verbose log message");
crypt_log(cd, CRYPT_LOG_DEBUG, "This is debug message");
/* release crypt context */
crypt_free(cd);
/* Initialize default (global) log callback */
crypt_set_log_callback(NULL, &simple_syslog_wrapper, NULL);
crypt_log(NULL, CRYPT_LOG_NORMAL, "This is normal log message");
crypt_log(NULL, CRYPT_LOG_ERROR, "This is error log message");
crypt_log(NULL, CRYPT_LOG_VERBOSE, "This is verbose log message");
crypt_log(NULL, CRYPT_LOG_DEBUG, "This is debug message");
closelog();
return 0;
}
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