- djm@cvs.openbsd.org 2010/01/30 02:54:53

[openssh.git] / log.c

diff --git a/log.c b/log.c
index 686a2a43cbd9413d1b56af5e02945b14f1a98d10..4a8239b931de474319b3cb21420eedbfaaeccc30 100644 (file)
--- a/log.c
+++ b/log.c
@@ -1,3 +1,4 @@
+/* $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
@@ -34,16 +35,23 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: log.c,v 1.29 2003/09/23 20:17:11 markus Exp $");
 
-#include "log.h"
-#include "xmalloc.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"
+
 static LogLevel log_level = SYSLOG_LEVEL_INFO;
 static int log_on_stderr = 1;
 static int log_facility = LOG_AUTH;
@@ -51,6 +59,9 @@ static char *argv0;
 
 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 {
@@ -103,6 +114,17 @@ log_facility_number(char *name)
        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)
 {
@@ -115,6 +137,17 @@ log_level_number(char *name)
        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
@@ -127,6 +160,20 @@ error(const char *fmt,...)
        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
@@ -190,6 +237,10 @@ debug3(const char *fmt,...)
 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;
 
        switch (level) {
@@ -258,6 +309,19 @@ log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
                    (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
 }
 
 #define MSGBUFSIZ 1024
@@ -265,13 +329,14 @@ log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
 void
 do_log(LogLevel level, const char *fmt, va_list args)
 {
-#ifdef OPENLOG_R
+#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;
@@ -316,12 +381,13 @@ do_log(LogLevel level, const char *fmt, va_list args)
        } else {
                vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
        }
-       strnvis(fmtbuf, msgbuf, sizeof(fmtbuf), VIS_SAFE|VIS_OCTAL);
+       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 {
-#ifdef OPENLOG_R
+#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);
@@ -331,4 +397,5 @@ do_log(LogLevel level, const char *fmt, va_list args)
                closelog();
 #endif
        }
+       errno = saved_errno;
 }