mirror of
https://gitlab.com/cryptsetup/cryptsetup.git
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97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
/*
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* An example of using logging through libcryptsetup API
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*
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* Copyright (C) 2011-2017, Red Hat, Inc. All rights reserved.
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*
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* This file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this file; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <libcryptsetup.h>
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/*
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* This is an example of function that can be registered using crypt_set_log_callback API.
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*
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* Its prototype is void (*log)(int level, const char *msg, void *usrptr) as defined
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* in crypt_set_log_callback
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*/
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static void simple_syslog_wrapper(int level, const char *msg, void *usrptr)
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{
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const char *prefix = (const char *)usrptr;
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int priority;
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switch(level) {
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case CRYPT_LOG_NORMAL: priority = LOG_NOTICE; break;
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case CRYPT_LOG_ERROR: priority = LOG_ERR; break;
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case CRYPT_LOG_VERBOSE: priority = LOG_INFO; break;
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case CRYPT_LOG_DEBUG: priority = LOG_DEBUG; break;
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default:
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fprintf(stderr, "Unsupported log level requested!\n");
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return;
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}
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if (prefix)
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syslog(priority, "%s:%s", prefix, msg);
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else
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syslog(priority, "%s", msg);
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}
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int main(void)
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{
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struct crypt_device *cd;
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char usrprefix[] = "cslog_example";
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int r;
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if (geteuid()) {
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printf("Using of libcryptsetup requires super user privileges.\n");
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return 1;
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}
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openlog("cryptsetup", LOG_CONS | LOG_PID, LOG_USER);
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/* Initialize empty crypt device context */
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r = crypt_init(&cd, NULL);
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if (r < 0) {
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printf("crypt_init() failed.\n");
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return 2;
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}
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/* crypt_set_log_callback() - register a log function for crypt context */
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crypt_set_log_callback(cd, &simple_syslog_wrapper, (void *)usrprefix);
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/* send messages ithrough the crypt_log() interface */
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crypt_log(cd, CRYPT_LOG_NORMAL, "This is normal log message");
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crypt_log(cd, CRYPT_LOG_ERROR, "This is error log message");
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crypt_log(cd, CRYPT_LOG_VERBOSE, "This is verbose log message");
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crypt_log(cd, CRYPT_LOG_DEBUG, "This is debug message");
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/* release crypt context */
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crypt_free(cd);
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/* Initialize default (global) log function */
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crypt_set_log_callback(NULL, &simple_syslog_wrapper, NULL);
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crypt_log(NULL, CRYPT_LOG_NORMAL, "This is normal log message");
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crypt_log(NULL, CRYPT_LOG_ERROR, "This is error log message");
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crypt_log(NULL, CRYPT_LOG_VERBOSE, "This is verbose log message");
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crypt_log(NULL, CRYPT_LOG_DEBUG, "This is debug message");
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closelog();
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return 0;
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}
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