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