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+/* $OpenBSD: log.c,v 1.51 2018/07/27 12:03:17 markus Exp $ */
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ */
+/*
+ * Copyright (c) 2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+
+#include <sys/types.h>
+
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <errno.h>
+#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
+# include <vis.h>
+#endif
+
+#include "log.h"
+
+static LogLevel log_level = SYSLOG_LEVEL_INFO;
+static int log_on_stderr = 1;
+static int log_stderr_fd = STDERR_FILENO;
+static int log_facility = LOG_AUTH;
+static char *argv0;
+static log_handler_fn *log_handler;
+static void *log_handler_ctx;
+
+extern char *__progname;
+
+#define LOG_SYSLOG_VIS (VIS_CSTYLE|VIS_NL|VIS_TAB|VIS_OCTAL)
+#define LOG_STDERR_VIS (VIS_SAFE|VIS_OCTAL)
+
+/* textual representation of log-facilities/levels */
+
+static struct {
+ const char *name;
+ SyslogFacility val;
+} log_facilities[] = {
+ { "DAEMON", SYSLOG_FACILITY_DAEMON },
+ { "USER", SYSLOG_FACILITY_USER },
+ { "AUTH", SYSLOG_FACILITY_AUTH },
+#ifdef LOG_AUTHPRIV
+ { "AUTHPRIV", SYSLOG_FACILITY_AUTHPRIV },
+#endif
+ { "LOCAL0", SYSLOG_FACILITY_LOCAL0 },
+ { "LOCAL1", SYSLOG_FACILITY_LOCAL1 },
+ { "LOCAL2", SYSLOG_FACILITY_LOCAL2 },
+ { "LOCAL3", SYSLOG_FACILITY_LOCAL3 },
+ { "LOCAL4", SYSLOG_FACILITY_LOCAL4 },
+ { "LOCAL5", SYSLOG_FACILITY_LOCAL5 },
+ { "LOCAL6", SYSLOG_FACILITY_LOCAL6 },
+ { "LOCAL7", SYSLOG_FACILITY_LOCAL7 },
+ { NULL, SYSLOG_FACILITY_NOT_SET }
+};
+
+static struct {
+ const char *name;
+ LogLevel val;
+} log_levels[] =
+{
+ { "QUIET", SYSLOG_LEVEL_QUIET },
+ { "FATAL", SYSLOG_LEVEL_FATAL },
+ { "ERROR", SYSLOG_LEVEL_ERROR },
+ { "INFO", SYSLOG_LEVEL_INFO },
+ { "VERBOSE", SYSLOG_LEVEL_VERBOSE },
+ { "DEBUG", SYSLOG_LEVEL_DEBUG1 },
+ { "DEBUG1", SYSLOG_LEVEL_DEBUG1 },
+ { "DEBUG2", SYSLOG_LEVEL_DEBUG2 },
+ { "DEBUG3", SYSLOG_LEVEL_DEBUG3 },
+ { NULL, SYSLOG_LEVEL_NOT_SET }
+};
+
+LogLevel
+log_level_get(void)
+{
+ return log_level;
+}
+
+SyslogFacility
+log_facility_number(char *name)
+{
+ int i;
+
+ if (name != NULL)
+ for (i = 0; log_facilities[i].name; i++)
+ if (strcasecmp(log_facilities[i].name, name) == 0)
+ return log_facilities[i].val;
+ return SYSLOG_FACILITY_NOT_SET;
+}
+
+const char *
+log_facility_name(SyslogFacility facility)
+{
+ u_int i;
+
+ for (i = 0; log_facilities[i].name; i++)
+ if (log_facilities[i].val == facility)
+ return log_facilities[i].name;
+ return NULL;
+}
+
+LogLevel
+log_level_number(char *name)
+{
+ int i;
+
+ if (name != NULL)
+ for (i = 0; log_levels[i].name; i++)
+ if (strcasecmp(log_levels[i].name, name) == 0)
+ return log_levels[i].val;
+ return SYSLOG_LEVEL_NOT_SET;
+}
+
+const char *
+log_level_name(LogLevel level)
+{
+ u_int i;
+
+ for (i = 0; log_levels[i].name != NULL; i++)
+ if (log_levels[i].val == level)
+ return log_levels[i].name;
+ return NULL;
+}
+
+/* Error messages that should be logged. */
+
+void
+error(const char *fmt,...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ do_log(SYSLOG_LEVEL_ERROR, fmt, args);
+ va_end(args);
+}
+
+void
+sigdie(const char *fmt,...)
+{
+#ifdef DO_LOG_SAFE_IN_SIGHAND
+ va_list args;
+
+ va_start(args, fmt);
+ do_log(SYSLOG_LEVEL_FATAL, fmt, args);
+ va_end(args);
+#endif
+ _exit(1);
+}
+
+void
+logdie(const char *fmt,...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ do_log(SYSLOG_LEVEL_INFO, fmt, args);
+ va_end(args);
+ cleanup_exit(255);
+}
+
+/* Log this message (information that usually should go to the log). */
+
+void
+logit(const char *fmt,...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ do_log(SYSLOG_LEVEL_INFO, fmt, args);
+ va_end(args);
+}
+
+/* More detailed messages (information that does not need to go to the log). */
+
+void
+verbose(const char *fmt,...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ do_log(SYSLOG_LEVEL_VERBOSE, fmt, args);
+ va_end(args);
+}
+
+/* Debugging messages that should not be logged during normal operation. */
+
+void
+debug(const char *fmt,...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ do_log(SYSLOG_LEVEL_DEBUG1, fmt, args);
+ va_end(args);
+}
+
+void
+debug2(const char *fmt,...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ do_log(SYSLOG_LEVEL_DEBUG2, fmt, args);
+ va_end(args);
+}
+
+void
+debug3(const char *fmt,...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ do_log(SYSLOG_LEVEL_DEBUG3, fmt, args);
+ va_end(args);
+}
+
+/*
+ * Initialize the log.
+ */
+
+void
+log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
+{
+#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
+ struct syslog_data sdata = SYSLOG_DATA_INIT;
+#endif
+
+ argv0 = av0;
+
+ if (log_change_level(level) != 0) {
+ fprintf(stderr, "Unrecognized internal syslog level code %d\n",
+ (int) level);
+ exit(1);
+ }
+
+ log_handler = NULL;
+ log_handler_ctx = NULL;
+
+ log_on_stderr = on_stderr;
+ if (on_stderr)
+ return;
+
+ switch (facility) {
+ case SYSLOG_FACILITY_DAEMON:
+ log_facility = LOG_DAEMON;
+ break;
+ case SYSLOG_FACILITY_USER:
+ log_facility = LOG_USER;
+ break;
+ case SYSLOG_FACILITY_AUTH:
+ log_facility = LOG_AUTH;
+ break;
+#ifdef LOG_AUTHPRIV
+ case SYSLOG_FACILITY_AUTHPRIV:
+ log_facility = LOG_AUTHPRIV;
+ break;
+#endif
+ case SYSLOG_FACILITY_LOCAL0:
+ log_facility = LOG_LOCAL0;
+ break;
+ case SYSLOG_FACILITY_LOCAL1:
+ log_facility = LOG_LOCAL1;
+ break;
+ case SYSLOG_FACILITY_LOCAL2:
+ log_facility = LOG_LOCAL2;
+ break;
+ case SYSLOG_FACILITY_LOCAL3:
+ log_facility = LOG_LOCAL3;
+ break;
+ case SYSLOG_FACILITY_LOCAL4:
+ log_facility = LOG_LOCAL4;
+ break;
+ case SYSLOG_FACILITY_LOCAL5:
+ log_facility = LOG_LOCAL5;
+ break;
+ case SYSLOG_FACILITY_LOCAL6:
+ log_facility = LOG_LOCAL6;
+ break;
+ case SYSLOG_FACILITY_LOCAL7:
+ log_facility = LOG_LOCAL7;
+ break;
+ default:
+ fprintf(stderr,
+ "Unrecognized internal syslog facility code %d\n",
+ (int) facility);
+ exit(1);
+ }
+
+ /*
+ * If an external library (eg libwrap) attempts to use syslog
+ * immediately after reexec, syslog may be pointing to the wrong
+ * facility, so we force an open/close of syslog here.
+ */
+#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
+ openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata);
+ closelog_r(&sdata);
+#else
+ openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
+ closelog();
+#endif
+}
+
+int
+log_change_level(LogLevel new_log_level)
+{
+ /* no-op if log_init has not been called */
+ if (argv0 == NULL)
+ return 0;
+
+ switch (new_log_level) {
+ case SYSLOG_LEVEL_QUIET:
+ case SYSLOG_LEVEL_FATAL:
+ case SYSLOG_LEVEL_ERROR:
+ case SYSLOG_LEVEL_INFO:
+ case SYSLOG_LEVEL_VERBOSE:
+ case SYSLOG_LEVEL_DEBUG1:
+ case SYSLOG_LEVEL_DEBUG2:
+ case SYSLOG_LEVEL_DEBUG3:
+ log_level = new_log_level;
+ return 0;
+ default:
+ return -1;
+ }
+}
+
+int
+log_is_on_stderr(void)
+{
+ return log_on_stderr && log_stderr_fd == STDERR_FILENO;
+}
+
+/* redirect what would usually get written to stderr to specified file */
+void
+log_redirect_stderr_to(const char *logfile)
+{
+ int fd;
+
+ if ((fd = open(logfile, O_WRONLY|O_CREAT|O_APPEND, 0600)) == -1) {
+ fprintf(stderr, "Couldn't open logfile %s: %s\n", logfile,
+ strerror(errno));
+ exit(1);
+ }
+ log_stderr_fd = fd;
+}
+
+#define MSGBUFSIZ 1024
+
+void
+set_log_handler(log_handler_fn *handler, void *ctx)
+{
+ log_handler = handler;
+ log_handler_ctx = ctx;
+}
+
+void
+do_log2(LogLevel level, const char *fmt,...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ do_log(level, fmt, args);
+ va_end(args);
+}
+
+void
+do_log(LogLevel level, const char *fmt, va_list args)
+{
+#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
+ struct syslog_data sdata = SYSLOG_DATA_INIT;
+#endif
+ char msgbuf[MSGBUFSIZ];
+ char fmtbuf[MSGBUFSIZ];
+ char *txt = NULL;
+ int pri = LOG_INFO;
+ int saved_errno = errno;
+ log_handler_fn *tmp_handler;
+
+ if (level > log_level)
+ return;
+
+ switch (level) {
+ case SYSLOG_LEVEL_FATAL:
+ if (!log_on_stderr)
+ txt = "fatal";
+ pri = LOG_CRIT;
+ break;
+ case SYSLOG_LEVEL_ERROR:
+ if (!log_on_stderr)
+ txt = "error";
+ pri = LOG_ERR;
+ break;
+ case SYSLOG_LEVEL_INFO:
+ pri = LOG_INFO;
+ break;
+ case SYSLOG_LEVEL_VERBOSE:
+ pri = LOG_INFO;
+ break;
+ case SYSLOG_LEVEL_DEBUG1:
+ txt = "debug1";
+ pri = LOG_DEBUG;
+ break;
+ case SYSLOG_LEVEL_DEBUG2:
+ txt = "debug2";
+ pri = LOG_DEBUG;
+ break;
+ case SYSLOG_LEVEL_DEBUG3:
+ txt = "debug3";
+ pri = LOG_DEBUG;
+ break;
+ default:
+ txt = "internal error";
+ pri = LOG_ERR;
+ break;
+ }
+ if (txt != NULL && log_handler == NULL) {
+ snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
+ vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
+ } else {
+ vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
+ }
+ strnvis(fmtbuf, msgbuf, sizeof(fmtbuf),
+ log_on_stderr ? LOG_STDERR_VIS : LOG_SYSLOG_VIS);
+ if (log_handler != NULL) {
+ /* Avoid recursion */
+ tmp_handler = log_handler;
+ log_handler = NULL;
+ tmp_handler(level, fmtbuf, log_handler_ctx);
+ log_handler = tmp_handler;
+ } else if (log_on_stderr) {
+ snprintf(msgbuf, sizeof msgbuf, "%.*s\r\n",
+ (int)sizeof msgbuf - 3, fmtbuf);
+ (void)write(log_stderr_fd, msgbuf, strlen(msgbuf));
+ } else {
+#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
+ openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata);
+ syslog_r(pri, &sdata, "%.500s", fmtbuf);
+ closelog_r(&sdata);
+#else
+ openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
+ syslog(pri, "%.500s", fmtbuf);
+ closelog();
+#endif
+ }
+ errno = saved_errno;
+}