usr.sbin/autofs/log.c

   1 /*-
   2  * Copyright (c) 2012 The FreeBSD Foundation
   3  * All rights reserved.
   4  *
   5  * This software was developed by Edward Tomasz Napierala under sponsorship
   6  * from the FreeBSD Foundation.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include <errno.h>
  35 #include <stdarg.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <syslog.h>
  40 #include <vis.h>
  41
  42 #include "common.h"
  43
  44 static int log_level = 0;
  45 static char *peer_name = NULL;
  46 static char *peer_addr = NULL;
  47
  48 #define MSGBUF_LEN      1024
  49
  50 void
  51 log_init(int level)
  52 {
  53
  54         log_level = level;
  55         openlog(getprogname(), LOG_NDELAY | LOG_PID, LOG_DAEMON);
  56 }
  57
  58 void
  59 log_set_peer_name(const char *name)
  60 {
  61
  62         /*
  63          * XXX: Turn it into assertion?
  64          */
  65         if (peer_name != NULL)
  66                 log_errx(1, "%s called twice", __func__);
  67         if (peer_addr == NULL)
  68                 log_errx(1, "%s called before log_set_peer_addr", __func__);
  69
  70         peer_name = checked_strdup(name);
  71 }
  72
  73 void
  74 log_set_peer_addr(const char *addr)
  75 {
  76
  77         /*
  78          * XXX: Turn it into assertion?
  79          */
  80         if (peer_addr != NULL)
  81                 log_errx(1, "%s called twice", __func__);
  82
  83         peer_addr = checked_strdup(addr);
  84 }
  85
  86 static void
  87 log_common(int priority, int log_errno, const char *fmt, va_list ap)
  88 {
  89         static char msgbuf[MSGBUF_LEN];
  90         static char msgbuf_strvised[MSGBUF_LEN * 4 + 1];
  91         char *errstr;
  92         int ret;
  93
  94         ret = vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
  95         if (ret < 0) {
  96                 fprintf(stderr, "%s: snprintf failed", getprogname());
  97                 syslog(LOG_CRIT, "snprintf failed");
  98                 exit(1);
  99         }
 100
 101         ret = strnvis(msgbuf_strvised, sizeof(msgbuf_strvised), msgbuf, VIS_NL);
 102         if (ret < 0) {
 103                 fprintf(stderr, "%s: strnvis failed", getprogname());
 104                 syslog(LOG_CRIT, "strnvis failed");
 105                 exit(1);
 106         }
 107
 108         if (log_errno == -1) {
 109                 if (peer_name != NULL) {
 110                         fprintf(stderr, "%s: %s (%s): %s\n", getprogname(),
 111                             peer_addr, peer_name, msgbuf_strvised);
 112                         syslog(priority, "%s (%s): %s",
 113                             peer_addr, peer_name, msgbuf_strvised);
 114                 } else if (peer_addr != NULL) {
 115                         fprintf(stderr, "%s: %s: %s\n", getprogname(),
 116                             peer_addr, msgbuf_strvised);
 117                         syslog(priority, "%s: %s",
 118                             peer_addr, msgbuf_strvised);
 119                 } else {
 120                         fprintf(stderr, "%s: %s\n", getprogname(), msgbuf_strvised);
 121                         syslog(priority, "%s", msgbuf_strvised);
 122                 }
 123
 124         } else {
 125                 errstr = strerror(log_errno);
 126
 127                 if (peer_name != NULL) {
 128                         fprintf(stderr, "%s: %s (%s): %s: %s\n", getprogname(),
 129                             peer_addr, peer_name, msgbuf_strvised, errstr);
 130                         syslog(priority, "%s (%s): %s: %s",
 131                             peer_addr, peer_name, msgbuf_strvised, errstr);
 132                 } else if (peer_addr != NULL) {
 133                         fprintf(stderr, "%s: %s: %s: %s\n", getprogname(),
 134                             peer_addr, msgbuf_strvised, errstr);
 135                         syslog(priority, "%s: %s: %s",
 136                             peer_addr, msgbuf_strvised, errstr);
 137                 } else {
 138                         fprintf(stderr, "%s: %s: %s\n", getprogname(),
 139                             msgbuf_strvised, errstr);
 140                         syslog(priority, "%s: %s",
 141                             msgbuf_strvised, errstr);
 142                 }
 143         }
 144 }
 145
 146 void
 147 log_err(int eval, const char *fmt, ...)
 148 {
 149         va_list ap;
 150
 151         va_start(ap, fmt);
 152         log_common(LOG_CRIT, errno, fmt, ap);
 153         va_end(ap);
 154
 155         exit(eval);
 156 }
 157
 158 void
 159 log_errx(int eval, const char *fmt, ...)
 160 {
 161         va_list ap;
 162
 163         va_start(ap, fmt);
 164         log_common(LOG_CRIT, -1, fmt, ap);
 165         va_end(ap);
 166
 167         exit(eval);
 168 }
 169
 170 void
 171 log_warn(const char *fmt, ...)
 172 {
 173         va_list ap;
 174
 175         va_start(ap, fmt);
 176         log_common(LOG_WARNING, errno, fmt, ap);
 177         va_end(ap);
 178 }
 179
 180 void
 181 log_warnx(const char *fmt, ...)
 182 {
 183         va_list ap;
 184
 185         va_start(ap, fmt);
 186         log_common(LOG_WARNING, -1, fmt, ap);
 187         va_end(ap);
 188 }
 189
 190 void
 191 log_debugx(const char *fmt, ...)
 192 {
 193         va_list ap;
 194
 195         if (log_level == 0)
 196                 return;
 197
 198         va_start(ap, fmt);
 199         log_common(LOG_DEBUG, -1, fmt, ap);
 200         va_end(ap);
 201 }