sbin/dhclient/errwarn.c

   1 /*      $OpenBSD: src/sbin/dhclient/errwarn.c,v 1.17 2009/11/26 23:14:29 krw Exp $      */
   2
   3 /* Errors and warnings... */
   4
   5 /*
   6  * Copyright (c) 1996 The Internet Software Consortium.
   7  * All Rights Reserved.
   8  * Copyright (c) 1995 RadioMail Corporation.  All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  *
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of RadioMail Corporation, the Internet Software
  20  *    Consortium nor the names of its contributors may be used to endorse
  21  *    or promote products derived from this software without specific
  22  *    prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY RADIOMAIL CORPORATION, THE INTERNET
  25  * SOFTWARE CONSORTIUM AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
  26  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  27  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL RADIOMAIL CORPORATION OR CONTRIBUTORS
  29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  35  * OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * This software was written for RadioMail Corporation by Ted Lemon
  38  * under a contract with Vixie Enterprises.   Further modifications have
  39  * been made for the Internet Software Consortium under a contract
  40  * with Vixie Laboratories.
  41  */
  42
  43 #include <sys/types.h>
  44 #include <sys/uio.h>
  45
  46 #include <errno.h>
  47 #include <unistd.h>
  48
  49 #include "dhcpd.h"
  50
  51 static void do_percentm(char *obuf, size_t size, char *ibuf);
  52
  53 static char mbuf[1024];
  54 static char fbuf[1024];
  55
  56 int warnings_occurred;
  57
  58 /*
  59  * Log an error message, then exit.
  60  */
  61 void
  62 error(char *fmt, ...)
  63 {
  64         va_list list;
  65
  66         do_percentm(fbuf, sizeof(fbuf), fmt);
  67
  68         va_start(list, fmt);
  69         vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
  70         va_end(list);
  71
  72 #ifndef DEBUG
  73         syslog(LOG_ERR, "%s", mbuf);
  74 #endif
  75
  76         /* Also log it to stderr? */
  77         if (log_perror) {
  78                 write(STDERR_FILENO, mbuf, strlen(mbuf));
  79                 write(STDERR_FILENO, "\n", 1);
  80         }
  81
  82         if (log_perror) {
  83                 fflush(stderr);
  84         }
  85         exit(1);
  86 }
  87
  88 /*
  89  * Log a warning message...
  90  */
  91 int
  92 warning(char *fmt, ...)
  93 {
  94         va_list list;
  95
  96         do_percentm(fbuf, sizeof(fbuf), fmt);
  97
  98         va_start(list, fmt);
  99         vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
 100         va_end(list);
 101
 102 #ifndef DEBUG
 103         syslog(LOG_ERR, "%s", mbuf);
 104 #endif
 105
 106         if (log_perror) {
 107                 write(STDERR_FILENO, mbuf, strlen(mbuf));
 108                 write(STDERR_FILENO, "\n", 1);
 109         }
 110
 111         return (0);
 112 }
 113
 114 /*
 115  * Log a note...
 116  */
 117 int
 118 note(char *fmt, ...)
 119 {
 120         va_list list;
 121
 122         do_percentm(fbuf, sizeof(fbuf), fmt);
 123
 124         va_start(list, fmt);
 125         vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
 126         va_end(list);
 127
 128 #ifndef DEBUG
 129         syslog(LOG_INFO, "%s", mbuf);
 130 #endif
 131
 132         if (log_perror) {
 133                 write(STDERR_FILENO, mbuf, strlen(mbuf));
 134                 write(STDERR_FILENO, "\n", 1);
 135         }
 136
 137         return (0);
 138 }
 139
 140 #ifdef DEBUG
 141 /*
 142  * Log a debug message...
 143  */
 144 int
 145 debug(char *fmt, ...)
 146 {
 147         va_list list;
 148
 149         do_percentm(fbuf, sizeof(fbuf), fmt);
 150
 151         va_start(list, fmt);
 152         vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
 153         va_end(list);
 154
 155         syslog(LOG_DEBUG, "%s", mbuf);
 156
 157         if (log_perror) {
 158                 write(STDERR_FILENO, mbuf, strlen(mbuf));
 159                 write(STDERR_FILENO, "\n", 1);
 160         }
 161
 162         return (0);
 163 }
 164 #endif
 165 /*
 166  * Find %m in the input string and substitute an error message string.
 167  */
 168 static void
 169 do_percentm(char *obuf, size_t size, char *ibuf)
 170 {
 171         char ch;
 172         char *s = ibuf;
 173         char *t = obuf;
 174         int prlen;
 175         ssize_t fmt_left;
 176         int saved_errno = errno;
 177
 178         /*
 179          * We wouldn't need this mess if printf handled %m, or if
 180          * strerror() had been invented before syslog().
 181          */
 182         for (fmt_left = size; (ch = *s); ++s) {
 183                 if (ch == '%' && s[1] == 'm') {
 184                         ++s;
 185                         prlen = snprintf(t, fmt_left, "%s",
 186                             strerror(saved_errno));
 187                         if (prlen == -1)
 188                                 prlen = 0;
 189                         else if (prlen >= fmt_left)
 190                                 prlen = fmt_left - 1;
 191                         t += prlen;
 192                         fmt_left -= prlen;
 193                 } else {
 194                         if (fmt_left > 1) {
 195                                 *t++ = ch;
 196                                 fmt_left--;
 197                         }
 198                 }
 199         }
 200         *t = '\0';
 201 }
 202
 203 int
 204 parse_warn(char *fmt, ...)
 205 {
 206         va_list list;
 207         static char spaces[] =
 208             "                                        "
 209             "                                        "; /* 80 spaces */
 210         struct iovec iov[6];
 211         size_t iovcnt;
 212
 213         do_percentm(mbuf, sizeof(mbuf), fmt);
 214         snprintf(fbuf, sizeof(fbuf), "%s line %d: %s", tlname, lexline, mbuf);
 215         va_start(list, fmt);
 216         vsnprintf(mbuf, sizeof(mbuf), fbuf, list);
 217         va_end(list);
 218
 219 #ifndef DEBUG
 220         syslog(LOG_ERR, "%s", mbuf);
 221         syslog(LOG_ERR, "%s", token_line);
 222         if (lexchar < 81)
 223                 syslog(LOG_ERR, "%*c", lexchar, '^');
 224 #endif
 225
 226         if (log_perror) {
 227                 iov[0].iov_base = mbuf;
 228                 iov[0].iov_len = strlen(mbuf);
 229                 iov[1].iov_base = "\n";
 230                 iov[1].iov_len = 1;
 231                 iov[2].iov_base = token_line;
 232                 iov[2].iov_len = strlen(token_line);
 233                 iov[3].iov_base = "\n";
 234                 iov[3].iov_len = 1;
 235                 iovcnt = 4;
 236                 if (lexchar < 81) {
 237                         iov[4].iov_base = spaces;
 238                         iov[4].iov_len = lexchar - 1;
 239                         iov[5].iov_base = "^\n";
 240                         iov[5].iov_len = 2;
 241                         iovcnt += 2;
 242                 }
 243                 writev(STDERR_FILENO, iov, iovcnt);
 244         }
 245         warnings_occurred = 1;
 246         return (0);
 247 }