d4af9e693f
I have worked hard to reduce diffs against the vendor branch. One notable change in that respect is that we no longer prefer DSA over RSA - the reasons for doing so went away years ago. This may cause some surprises, as ssh will warn about unknown host keys even for hosts whose keys haven't changed. MFC after: 6 weeks
402 lines
9.2 KiB
C
402 lines
9.2 KiB
C
/* $OpenBSD: log.c,v 1.41 2008/06/10 04:50:25 dtucker Exp $ */
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/*
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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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#include <sys/types.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <errno.h>
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#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H)
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# include <vis.h>
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#endif
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#include "xmalloc.h"
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#include "log.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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#define LOG_SYSLOG_VIS (VIS_CSTYLE|VIS_NL|VIS_TAB|VIS_OCTAL)
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#define LOG_STDERR_VIS (VIS_SAFE|VIS_OCTAL)
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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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const char *
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log_facility_name(SyslogFacility facility)
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{
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u_int i;
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for (i = 0; log_facilities[i].name; i++)
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if (log_facilities[i].val == facility)
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return log_facilities[i].name;
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return NULL;
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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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const char *
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log_level_name(LogLevel level)
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{
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u_int i;
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for (i = 0; log_levels[i].name != NULL; i++)
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if (log_levels[i].val == level)
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return log_levels[i].name;
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return NULL;
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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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void
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sigdie(const char *fmt,...)
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{
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#ifdef DO_LOG_SAFE_IN_SIGHAND
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va_list args;
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va_start(args, fmt);
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do_log(SYSLOG_LEVEL_FATAL, fmt, args);
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va_end(args);
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#endif
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_exit(1);
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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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logit(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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/*
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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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#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
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struct syslog_data sdata = SYSLOG_DATA_INIT;
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#endif
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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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* If an external library (eg libwrap) attempts to use syslog
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* immediately after reexec, syslog may be pointing to the wrong
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* facility, so we force an open/close of syslog here.
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*/
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#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
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openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata);
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closelog_r(&sdata);
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#else
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openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
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closelog();
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#endif
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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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#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
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struct syslog_data sdata = SYSLOG_DATA_INIT;
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#endif
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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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int saved_errno = errno;
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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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strnvis(fmtbuf, msgbuf, sizeof(fmtbuf),
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log_on_stderr ? LOG_STDERR_VIS : LOG_SYSLOG_VIS);
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if (log_on_stderr) {
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snprintf(msgbuf, sizeof msgbuf, "%s\r\n", fmtbuf);
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write(STDERR_FILENO, msgbuf, strlen(msgbuf));
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} else {
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#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
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openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata);
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syslog_r(pri, &sdata, "%.500s", fmtbuf);
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closelog_r(&sdata);
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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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#endif
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}
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errno = saved_errno;
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}
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