sysklogd/logger.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini logger implementation for busybox
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9 //config:config LOGGER
  10 //config:       bool "logger (6.5 kb)"
  11 //config:       default y
  12 //config:       select FEATURE_SYSLOG
  13 //config:       help
  14 //config:       The logger utility allows you to send arbitrary text
  15 //config:       messages to the system log (i.e. the 'syslogd' utility) so
  16 //config:       they can be logged. This is generally used to help locate
  17 //config:       problems that occur within programs and scripts.
  18
  19 //applet:IF_LOGGER(APPLET(logger, BB_DIR_USR_BIN, BB_SUID_DROP))
  20
  21 //kbuild:lib-$(CONFIG_LOGGER) += syslogd_and_logger.o
  22
  23 //usage:#define logger_trivial_usage
  24 //usage:       "[-s] [-t TAG] [-p PRIO] [MESSAGE]"
  25 //usage:#define logger_full_usage "\n\n"
  26 //usage:       "Write MESSAGE (or stdin) to syslog\n"
  27 //usage:     "\n        -s      Log to stderr as well as the system log"
  28 //usage:     "\n        -t TAG  Log using the specified tag (defaults to user name)"
  29 //usage:     "\n        -p PRIO Priority (number or FACILITY.LEVEL pair)"
  30 //usage:
  31 //usage:#define logger_example_usage
  32 //usage:       "$ logger \"hello\"\n"
  33
  34 /*
  35  * Done in syslogd_and_logger.c:
  36 #include "libbb.h"
  37 #define SYSLOG_NAMES
  38 #define SYSLOG_NAMES_CONST
  39 #include <syslog.h>
  40 */
  41
  42 /* Decode a symbolic name to a numeric value
  43  * this function is based on code
  44  * Copyright (c) 1983, 1993
  45  * The Regents of the University of California.  All rights reserved.
  46  *
  47  * Original copyright notice is retained at the end of this file.
  48  */
  49 static int decode(char *name, const CODE *codetab)
  50 {
  51         const CODE *c;
  52
  53         if (isdigit(*name))
  54                 return atoi(name);
  55         for (c = codetab; c->c_name; c++) {
  56                 if (!strcasecmp(name, c->c_name)) {
  57                         return c->c_val;
  58                 }
  59         }
  60
  61         return -1;
  62 }
  63
  64 /* Decode a symbolic name to a numeric value
  65  * this function is based on code
  66  * Copyright (c) 1983, 1993
  67  * The Regents of the University of California.  All rights reserved.
  68  *
  69  * Original copyright notice is retained at the end of this file.
  70  */
  71 static int pencode(char *s)
  72 {
  73         char *save;
  74         int lev, fac = LOG_USER;
  75
  76         for (save = s; *s && *s != '.'; ++s)
  77                 ;
  78         if (*s) {
  79                 *s = '\0';
  80                 fac = decode(save, bb_facilitynames);
  81                 if (fac < 0)
  82                         bb_error_msg_and_die("unknown %s name: %s", "facility", save);
  83                 *s++ = '.';
  84         } else {
  85                 s = save;
  86         }
  87         lev = decode(s, bb_prioritynames);
  88         if (lev < 0)
  89                 bb_error_msg_and_die("unknown %s name: %s", "priority", save);
  90         return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
  91 }
  92
  93 #define strbuf bb_common_bufsiz1
  94
  95 int logger_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  96 int logger_main(int argc UNUSED_PARAM, char **argv)
  97 {
  98         char *str_p, *str_t;
  99         int opt;
 100         int i = 0;
 101
 102         setup_common_bufsiz();
 103
 104         /* Fill out the name string early (may be overwritten later) */
 105         str_t = uid2uname_utoa(geteuid());
 106
 107         /* Parse any options */
 108         opt = getopt32(argv, "p:st:", &str_p, &str_t);
 109
 110         if (opt & 0x2) /* -s */
 111                 i |= LOG_PERROR;
 112         //if (opt & 0x4) /* -t */
 113         openlog(str_t, i, 0);
 114         i = LOG_USER | LOG_NOTICE;
 115         if (opt & 0x1) /* -p */
 116                 i = pencode(str_p);
 117
 118         argv += optind;
 119         if (!argv[0]) {
 120                 while (fgets(strbuf, COMMON_BUFSIZE, stdin)) {
 121                         if (strbuf[0]
 122                          && NOT_LONE_CHAR(strbuf, '\n')
 123                         ) {
 124                                 /* Neither "" nor "\n" */
 125                                 syslog(i, "%s", strbuf);
 126                         }
 127                 }
 128         } else {
 129                 char *message = NULL;
 130                 int len = 0;
 131                 int pos = 0;
 132                 do {
 133                         len += strlen(*argv) + 1;
 134                         message = xrealloc(message, len + 1);
 135                         sprintf(message + pos, " %s", *argv),
 136                         pos = len;
 137                 } while (*++argv);
 138                 syslog(i, "%s", message + 1); /* skip leading " " */
 139         }
 140
 141         closelog();
 142         return EXIT_SUCCESS;
 143 }
 144
 145 /* Clean up. Needed because we are included from syslogd_and_logger.c */
 146 #undef strbuf
 147
 148 /*-
 149  * Copyright (c) 1983, 1993
 150  * The Regents of the University of California.  All rights reserved.
 151  *
 152  * This is the original license statement for the decode and pencode functions.
 153  *
 154  * Redistribution and use in source and binary forms, with or without
 155  * modification, are permitted provided that the following conditions
 156  * are met:
 157  * 1. Redistributions of source code must retain the above copyright
 158  *    notice, this list of conditions and the following disclaimer.
 159  * 2. Redistributions in binary form must reproduce the above copyright
 160  *    notice, this list of conditions and the following disclaimer in the
 161  *    documentation and/or other materials provided with the distribution.
 162  *
 163  * 3. BSD Advertising Clause omitted per the July 22, 1999 licensing change
 164  *    ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
 165  *
 166  * 4. Neither the name of the University nor the names of its contributors
 167  *    may be used to endorse or promote products derived from this software
 168  *    without specific prior written permission.
 169  *
 170  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND
 171  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 172  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 173  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 174  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 175  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 176  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 177  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 178  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 179  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 180  * SUCH DAMAGE.
 181  */