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401 lines
8.9 KiB
C
401 lines
8.9 KiB
C
/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*/
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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RCSID("$OpenBSD: log.c,v 1.25 2003/01/11 18:29:43 markus Exp $");
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#include "log.h"
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#include "xmalloc.h"
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#include <syslog.h>
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static LogLevel log_level = SYSLOG_LEVEL_INFO;
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static int log_on_stderr = 1;
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static int log_facility = LOG_AUTH;
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static char *argv0;
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extern char *__progname;
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/* textual representation of log-facilities/levels */
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static struct {
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const char *name;
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SyslogFacility val;
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} log_facilities[] = {
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{ "DAEMON", SYSLOG_FACILITY_DAEMON },
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{ "USER", SYSLOG_FACILITY_USER },
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{ "AUTH", SYSLOG_FACILITY_AUTH },
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#ifdef LOG_AUTHPRIV
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{ "AUTHPRIV", SYSLOG_FACILITY_AUTHPRIV },
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#endif
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{ "LOCAL0", SYSLOG_FACILITY_LOCAL0 },
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{ "LOCAL1", SYSLOG_FACILITY_LOCAL1 },
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{ "LOCAL2", SYSLOG_FACILITY_LOCAL2 },
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{ "LOCAL3", SYSLOG_FACILITY_LOCAL3 },
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{ "LOCAL4", SYSLOG_FACILITY_LOCAL4 },
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{ "LOCAL5", SYSLOG_FACILITY_LOCAL5 },
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{ "LOCAL6", SYSLOG_FACILITY_LOCAL6 },
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{ "LOCAL7", SYSLOG_FACILITY_LOCAL7 },
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{ NULL, SYSLOG_FACILITY_NOT_SET }
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};
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static struct {
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const char *name;
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LogLevel val;
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} log_levels[] =
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{
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{ "QUIET", SYSLOG_LEVEL_QUIET },
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{ "FATAL", SYSLOG_LEVEL_FATAL },
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{ "ERROR", SYSLOG_LEVEL_ERROR },
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{ "INFO", SYSLOG_LEVEL_INFO },
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{ "VERBOSE", SYSLOG_LEVEL_VERBOSE },
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{ "DEBUG", SYSLOG_LEVEL_DEBUG1 },
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{ "DEBUG1", SYSLOG_LEVEL_DEBUG1 },
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{ "DEBUG2", SYSLOG_LEVEL_DEBUG2 },
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{ "DEBUG3", SYSLOG_LEVEL_DEBUG3 },
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{ NULL, SYSLOG_LEVEL_NOT_SET }
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};
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SyslogFacility
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log_facility_number(char *name)
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{
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int i;
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if (name != NULL)
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for (i = 0; log_facilities[i].name; i++)
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if (strcasecmp(log_facilities[i].name, name) == 0)
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return log_facilities[i].val;
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return SYSLOG_FACILITY_NOT_SET;
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}
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LogLevel
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log_level_number(char *name)
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{
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int i;
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if (name != NULL)
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for (i = 0; log_levels[i].name; i++)
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if (strcasecmp(log_levels[i].name, name) == 0)
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return log_levels[i].val;
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return SYSLOG_LEVEL_NOT_SET;
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}
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/* Error messages that should be logged. */
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void
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error(const char *fmt,...)
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{
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va_list args;
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va_start(args, fmt);
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do_log(SYSLOG_LEVEL_ERROR, fmt, args);
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va_end(args);
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}
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/* Log this message (information that usually should go to the log). */
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void
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log(const char *fmt,...)
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{
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va_list args;
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va_start(args, fmt);
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do_log(SYSLOG_LEVEL_INFO, fmt, args);
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va_end(args);
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}
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/* More detailed messages (information that does not need to go to the log). */
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void
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verbose(const char *fmt,...)
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{
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va_list args;
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va_start(args, fmt);
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do_log(SYSLOG_LEVEL_VERBOSE, fmt, args);
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va_end(args);
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}
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/* Debugging messages that should not be logged during normal operation. */
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void
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debug(const char *fmt,...)
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{
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va_list args;
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va_start(args, fmt);
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do_log(SYSLOG_LEVEL_DEBUG1, fmt, args);
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va_end(args);
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}
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void
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debug2(const char *fmt,...)
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{
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va_list args;
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va_start(args, fmt);
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do_log(SYSLOG_LEVEL_DEBUG2, fmt, args);
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va_end(args);
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}
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void
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debug3(const char *fmt,...)
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{
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va_list args;
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va_start(args, fmt);
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do_log(SYSLOG_LEVEL_DEBUG3, fmt, args);
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va_end(args);
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}
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/* Fatal cleanup */
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struct fatal_cleanup {
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struct fatal_cleanup *next;
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void (*proc) (void *);
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void *context;
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};
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static struct fatal_cleanup *fatal_cleanups = NULL;
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/* Registers a cleanup function to be called by fatal() before exiting. */
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void
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fatal_add_cleanup(void (*proc) (void *), void *context)
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{
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struct fatal_cleanup *cu;
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cu = xmalloc(sizeof(*cu));
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cu->proc = proc;
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cu->context = context;
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cu->next = fatal_cleanups;
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fatal_cleanups = cu;
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}
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/* Removes a cleanup frunction to be called at fatal(). */
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void
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fatal_remove_cleanup(void (*proc) (void *context), void *context)
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{
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struct fatal_cleanup **cup, *cu;
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for (cup = &fatal_cleanups; *cup; cup = &cu->next) {
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cu = *cup;
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if (cu->proc == proc && cu->context == context) {
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*cup = cu->next;
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xfree(cu);
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return;
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}
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}
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fatal("fatal_remove_cleanup: no such cleanup function: 0x%lx 0x%lx",
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(u_long) proc, (u_long) context);
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}
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/* Remove all cleanups, to be called after fork() */
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void
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fatal_remove_all_cleanups(void)
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{
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struct fatal_cleanup *cu, *next_cu;
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for (cu = fatal_cleanups; cu; cu = next_cu) {
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next_cu = cu->next;
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xfree(cu);
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}
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fatal_cleanups = NULL;
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}
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/* Cleanup and exit */
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void
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fatal_cleanup(void)
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{
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struct fatal_cleanup *cu, *next_cu;
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static int called = 0;
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if (called)
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exit(255);
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called = 1;
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/* Call cleanup functions. */
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for (cu = fatal_cleanups; cu; cu = next_cu) {
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next_cu = cu->next;
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debug("Calling cleanup 0x%lx(0x%lx)",
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(u_long) cu->proc, (u_long) cu->context);
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(*cu->proc) (cu->context);
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}
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exit(255);
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}
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/*
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* Initialize the log.
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*/
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void
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log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
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{
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argv0 = av0;
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switch (level) {
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case SYSLOG_LEVEL_QUIET:
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case SYSLOG_LEVEL_FATAL:
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case SYSLOG_LEVEL_ERROR:
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case SYSLOG_LEVEL_INFO:
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case SYSLOG_LEVEL_VERBOSE:
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case SYSLOG_LEVEL_DEBUG1:
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case SYSLOG_LEVEL_DEBUG2:
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case SYSLOG_LEVEL_DEBUG3:
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log_level = level;
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break;
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default:
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fprintf(stderr, "Unrecognized internal syslog level code %d\n",
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(int) level);
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exit(1);
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}
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log_on_stderr = on_stderr;
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if (on_stderr)
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return;
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switch (facility) {
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case SYSLOG_FACILITY_DAEMON:
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log_facility = LOG_DAEMON;
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break;
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case SYSLOG_FACILITY_USER:
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log_facility = LOG_USER;
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break;
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case SYSLOG_FACILITY_AUTH:
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log_facility = LOG_AUTH;
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break;
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#ifdef LOG_AUTHPRIV
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case SYSLOG_FACILITY_AUTHPRIV:
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log_facility = LOG_AUTHPRIV;
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break;
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#endif
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case SYSLOG_FACILITY_LOCAL0:
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log_facility = LOG_LOCAL0;
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break;
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case SYSLOG_FACILITY_LOCAL1:
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log_facility = LOG_LOCAL1;
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break;
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case SYSLOG_FACILITY_LOCAL2:
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log_facility = LOG_LOCAL2;
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break;
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case SYSLOG_FACILITY_LOCAL3:
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log_facility = LOG_LOCAL3;
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break;
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case SYSLOG_FACILITY_LOCAL4:
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log_facility = LOG_LOCAL4;
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break;
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case SYSLOG_FACILITY_LOCAL5:
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log_facility = LOG_LOCAL5;
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break;
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case SYSLOG_FACILITY_LOCAL6:
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log_facility = LOG_LOCAL6;
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break;
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case SYSLOG_FACILITY_LOCAL7:
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log_facility = LOG_LOCAL7;
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break;
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default:
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fprintf(stderr,
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"Unrecognized internal syslog facility code %d\n",
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(int) facility);
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exit(1);
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}
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}
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#define MSGBUFSIZ 1024
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void
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do_log(LogLevel level, const char *fmt, va_list args)
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{
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char msgbuf[MSGBUFSIZ];
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char fmtbuf[MSGBUFSIZ];
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char *txt = NULL;
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int pri = LOG_INFO;
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if (level > log_level)
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return;
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switch (level) {
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case SYSLOG_LEVEL_FATAL:
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if (!log_on_stderr)
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txt = "fatal";
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pri = LOG_CRIT;
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break;
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case SYSLOG_LEVEL_ERROR:
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if (!log_on_stderr)
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txt = "error";
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pri = LOG_ERR;
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break;
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case SYSLOG_LEVEL_INFO:
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pri = LOG_INFO;
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break;
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case SYSLOG_LEVEL_VERBOSE:
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pri = LOG_INFO;
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break;
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case SYSLOG_LEVEL_DEBUG1:
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txt = "debug1";
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pri = LOG_DEBUG;
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break;
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case SYSLOG_LEVEL_DEBUG2:
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txt = "debug2";
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pri = LOG_DEBUG;
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break;
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case SYSLOG_LEVEL_DEBUG3:
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txt = "debug3";
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pri = LOG_DEBUG;
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break;
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default:
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txt = "internal error";
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pri = LOG_ERR;
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break;
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}
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if (txt != NULL) {
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snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
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vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
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} else {
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vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
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}
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/* Escape magic chars in output. */
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strnvis(fmtbuf, msgbuf, sizeof(fmtbuf), VIS_OCTAL);
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if (log_on_stderr) {
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fprintf(stderr, "%s\r\n", fmtbuf);
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} else {
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openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
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syslog(pri, "%.500s", fmtbuf);
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closelog();
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}
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}
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