usr/src/cmd/smbsrv/smbd/smbd_syslog.c

   1 /*
   2  * This file and its contents are supplied under the terms of the
   3  * Common Development and Distribution License ("CDDL"), version 1.0.
   4  * You may only use this file in accordance with the terms of version
   5  * 1.0 of the CDDL.
   6  *
   7  * A full copy of the text of the CDDL should have accompanied this
   8  * source.  A copy of the CDDL is also available via the Internet at
   9  * http://www.illumos.org/license/CDDL.
  10  */
  11
  12 /*
  13  * Copyright 2014 Nexenta Systems, Inc.  All rights reserved.
  14  */
  15
  16 #include <stdio.h>
  17 #include <stdarg.h>
  18 #include <errno.h>
  19 #include <string.h>
  20 #include <syslog.h>
  21
  22 #include <smbsrv/smbinfo.h>
  23 #include <smbsrv/smb_ioctl.h>
  24 #include "smbd.h"
  25
  26 #define CBUFSIZ 26      /* ctime(3c) */
  27
  28 static const char *pri_name[LOG_DEBUG+1] = {
  29         "emerg", "alert", "crit", "err", "warning", "notice", "info", "debug"
  30 };
  31
  32 static void
  33 smb_svc_log(int pri, const char *fmt, va_list ap)
  34 {
  35         static time_t prev_ts;
  36         char fbuf[SMBD_LOG_MSGSIZE];
  37         char cbuf[CBUFSIZ];
  38         char *newfmt;
  39         time_t ts;
  40         int save_errno = errno;
  41
  42         pri &= LOG_PRIMASK;
  43         if (smbd.s_debug == 0 && pri == LOG_DEBUG)
  44                 return;
  45
  46         ts = time(NULL);
  47         if (prev_ts != ts) {
  48                 prev_ts = ts;
  49                 /* NB: cbuf has \n */
  50                 (void) fprintf(stdout, "@ %s",
  51                     ctime_r(&ts, cbuf, sizeof (cbuf)));
  52         }
  53
  54         newfmt = smb_syslog_fmt_m(fbuf, sizeof (fbuf), fmt, save_errno);
  55
  56         flockfile(stdout);
  57         (void) fprintf(stdout, "smbd.%s: ", pri_name[pri]);
  58         /* LINTED E_SEC_PRINTF_VAR_FMT */
  59         (void) vfprintf(stdout, newfmt, ap);
  60         (void) fprintf(stdout, "\n");
  61         funlockfile(stdout);
  62
  63         (void) fflush(stdout);
  64 }
  65
  66 /*
  67  * Provide a replacement for libsmb:smb_vsyslog() that prints messages
  68  * both to the normal sysloc(3c), and to stdout, which ends up in:
  69  *  /var/svc/log/network-smb-server:default.log
  70  * It's much easier to follow debug messages in the service log.
  71  */
  72 void
  73 smb_vsyslog(int pri, const char *fmt, va_list ap)
  74 {
  75         va_list tap;
  76
  77         va_copy(tap, ap);
  78         smb_svc_log(pri, fmt, tap);
  79         va_end(tap);
  80
  81         vsyslog(pri, fmt, ap);
  82 }
  83
  84 /*
  85  * An override for libsmb:smb_trace().  As the comment there says:
  86  *
  87  * This function is designed to be used with dtrace, i.e. see:
  88  * usr/src/cmd/smbsrv/dtrace/smbd-all.d
  89  *
  90  * Outside of dtrace, the messages passed to this function usually
  91  * lack sufficient context to be useful, so don't log them.
  92  * However, if you insist, set debug >= 3 and this will log them.
  93  */
  94 void
  95 smb_trace(const char *s)
  96 {
  97         if (smbd.s_debug >= 3)
  98                 (void) fprintf(stdout, "smbd.trace: %s\n", s);
  99 }