+/* $OpenBSD: log.c,v 1.41 2008/06/10 04:50:25 dtucker Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* called by a name other than "ssh" or "Secure Shell".
*/
/*
- * Shared versions of debug(), log(), etc.
- *
* Copyright (c) 2000 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
*/
#include "includes.h"
-RCSID("$OpenBSD: log.c,v 1.14 2001/01/18 16:20:21 markus Exp $");
-#include "ssh.h"
+#include <sys/types.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)
+# include <vis.h>
+#endif
+
#include "xmalloc.h"
+#include "log.h"
-/* Fatal messages. This function never returns. */
+static LogLevel log_level = SYSLOG_LEVEL_INFO;
+static int log_on_stderr = 1;
+static int log_facility = LOG_AUTH;
+static char *argv0;
-void
-fatal(const char *fmt,...)
+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[] =
{
- va_list args;
- va_start(args, fmt);
- do_log(SYSLOG_LEVEL_FATAL, fmt, args);
- va_end(args);
- fatal_cleanup();
+ { "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 }
+};
+
+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. */
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);
+}
+
+
/* Log this message (information that usually should go to the log). */
void
-log(const char *fmt,...)
+logit(const char *fmt,...)
{
va_list args;
+
va_start(args, fmt);
do_log(SYSLOG_LEVEL_INFO, fmt, args);
va_end(args);
verbose(const char *fmt,...)
{
va_list args;
+
va_start(args, fmt);
do_log(SYSLOG_LEVEL_VERBOSE, fmt, args);
va_end(args);
debug(const char *fmt,...)
{
va_list args;
+
va_start(args, fmt);
do_log(SYSLOG_LEVEL_DEBUG1, fmt, args);
va_end(args);
debug2(const char *fmt,...)
{
va_list args;
+
va_start(args, fmt);
do_log(SYSLOG_LEVEL_DEBUG2, fmt, args);
va_end(args);
debug3(const char *fmt,...)
{
va_list args;
+
va_start(args, fmt);
do_log(SYSLOG_LEVEL_DEBUG3, fmt, args);
va_end(args);
}
-/* Fatal cleanup */
-
-struct fatal_cleanup {
- struct fatal_cleanup *next;
- void (*proc) (void *);
- void *context;
-};
-
-static struct fatal_cleanup *fatal_cleanups = NULL;
-
-/* Registers a cleanup function to be called by fatal() before exiting. */
+/*
+ * Initialize the log.
+ */
void
-fatal_add_cleanup(void (*proc) (void *), void *context)
+log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
{
- struct fatal_cleanup *cu;
-
- cu = xmalloc(sizeof(*cu));
- cu->proc = proc;
- cu->context = context;
- cu->next = fatal_cleanups;
- fatal_cleanups = cu;
-}
+#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
+ struct syslog_data sdata = SYSLOG_DATA_INIT;
+#endif
-/* Removes a cleanup frunction to be called at fatal(). */
+ argv0 = av0;
-void
-fatal_remove_cleanup(void (*proc) (void *context), void *context)
-{
- struct fatal_cleanup **cup, *cu;
-
- for (cup = &fatal_cleanups; *cup; cup = &cu->next) {
- cu = *cup;
- if (cu->proc == proc && cu->context == context) {
- *cup = cu->next;
- xfree(cu);
- return;
- }
+ switch (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 = level;
+ break;
+ default:
+ fprintf(stderr, "Unrecognized internal syslog level code %d\n",
+ (int) level);
+ exit(1);
}
- fatal("fatal_remove_cleanup: no such cleanup function: 0x%lx 0x%lx\n",
- (u_long) proc, (u_long) context);
-}
-/* Cleanup and exit */
-void
-fatal_cleanup(void)
-{
- struct fatal_cleanup *cu, *next_cu;
- static int called = 0;
-
- if (called)
- exit(255);
- called = 1;
- /* Call cleanup functions. */
- for (cu = fatal_cleanups; cu; cu = next_cu) {
- next_cu = cu->next;
- debug("Calling cleanup 0x%lx(0x%lx)",
- (u_long) cu->proc, (u_long) cu->context);
- (*cu->proc) (cu->context);
- }
- exit(255);
-}
-
-/* textual representation of log-facilities/levels */
+ log_on_stderr = on_stderr;
+ if (on_stderr)
+ return;
-static struct {
- const char *name;
- SyslogFacility val;
-} log_facilities[] = {
- { "DAEMON", SYSLOG_FACILITY_DAEMON },
- { "USER", SYSLOG_FACILITY_USER },
- { "AUTH", SYSLOG_FACILITY_AUTH },
+ 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
- { "AUTHPRIV", SYSLOG_FACILITY_AUTHPRIV },
+ case SYSLOG_FACILITY_AUTHPRIV:
+ log_facility = LOG_AUTHPRIV;
+ break;
#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, 0 }
-};
-
-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, 0 }
-};
+ 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);
+ }
-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 (SyslogFacility) - 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
}
-LogLevel
-log_level_number(char *name)
+#define MSGBUFSIZ 1024
+
+void
+do_log(LogLevel level, const char *fmt, va_list args)
{
- 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 (LogLevel) - 1;
+#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;
+
+ 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) {
+ 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_on_stderr) {
+ snprintf(msgbuf, sizeof msgbuf, "%s\r\n", fmtbuf);
+ write(STDERR_FILENO, 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;
}
andersk / openssh.git / blobdiff