1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini syslogd 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 | * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
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8 | *
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9 | * "circular buffer" Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>
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10 | *
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11 | * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
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12 | *
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13 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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14 | */
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15 | //config:config SYSLOGD
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16 | //config: bool "syslogd"
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17 | //config: default y
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18 | //config: help
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19 | //config: The syslogd utility is used to record logs of all the
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20 | //config: significant events that occur on a system. Every
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21 | //config: message that is logged records the date and time of the
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22 | //config: event, and will generally also record the name of the
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23 | //config: application that generated the message. When used in
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24 | //config: conjunction with klogd, messages from the Linux kernel
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25 | //config: can also be recorded. This is terribly useful,
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26 | //config: especially for finding what happened when something goes
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27 | //config: wrong. And something almost always will go wrong if
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28 | //config: you wait long enough....
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29 | //config:
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30 | //config:config FEATURE_ROTATE_LOGFILE
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31 | //config: bool "Rotate message files"
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32 | //config: default y
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33 | //config: depends on SYSLOGD
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34 | //config: help
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35 | //config: This enables syslogd to rotate the message files
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36 | //config: on his own. No need to use an external rotate script.
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37 | //config:
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38 | //config:config FEATURE_REMOTE_LOG
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39 | //config: bool "Remote Log support"
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40 | //config: default y
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41 | //config: depends on SYSLOGD
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42 | //config: help
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43 | //config: When you enable this feature, the syslogd utility can
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44 | //config: be used to send system log messages to another system
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45 | //config: connected via a network. This allows the remote
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46 | //config: machine to log all the system messages, which can be
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47 | //config: terribly useful for reducing the number of serial
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48 | //config: cables you use. It can also be a very good security
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49 | //config: measure to prevent system logs from being tampered with
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50 | //config: by an intruder.
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51 | //config:
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52 | //config:config FEATURE_SYSLOGD_DUP
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53 | //config: bool "Support -D (drop dups) option"
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54 | //config: default y
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55 | //config: depends on SYSLOGD
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56 | //config: help
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57 | //config: Option -D instructs syslogd to drop consecutive messages
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58 | //config: which are totally the same.
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59 | //config:
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60 | //config:config FEATURE_SYSLOGD_CFG
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61 | //config: bool "Support syslog.conf"
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62 | //config: default y
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63 | //config: depends on SYSLOGD
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64 | //config: help
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65 | //config: Supports restricted syslogd config. See docs/syslog.conf.txt
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66 | //config:
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67 | //config:config FEATURE_SYSLOGD_READ_BUFFER_SIZE
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68 | //config: int "Read buffer size in bytes"
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69 | //config: default 256
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70 | //config: range 256 20000
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71 | //config: depends on SYSLOGD
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72 | //config: help
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73 | //config: This option sets the size of the syslog read buffer.
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74 | //config: Actual memory usage increases around five times the
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75 | //config: change done here.
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76 | //config:
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77 | //config:config FEATURE_IPC_SYSLOG
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78 | //config: bool "Circular Buffer support"
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79 | //config: default y
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80 | //config: depends on SYSLOGD
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81 | //config: help
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82 | //config: When you enable this feature, the syslogd utility will
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83 | //config: use a circular buffer to record system log messages.
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84 | //config: When the buffer is filled it will continue to overwrite
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85 | //config: the oldest messages. This can be very useful for
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86 | //config: systems with little or no permanent storage, since
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87 | //config: otherwise system logs can eventually fill up your
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88 | //config: entire filesystem, which may cause your system to
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89 | //config: break badly.
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90 | //config:
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91 | //config:config FEATURE_IPC_SYSLOG_BUFFER_SIZE
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92 | //config: int "Circular buffer size in Kbytes (minimum 4KB)"
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93 | //config: default 16
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94 | //config: range 4 2147483647
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95 | //config: depends on FEATURE_IPC_SYSLOG
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96 | //config: help
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97 | //config: This option sets the size of the circular buffer
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98 | //config: used to record system log messages.
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99 | //config:
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100 | //config:config FEATURE_KMSG_SYSLOG
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101 | //config: bool "Linux kernel printk buffer support"
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102 | //config: default y
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103 | //config: depends on SYSLOGD
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104 | //config: select PLATFORM_LINUX
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105 | //config: help
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106 | //config: When you enable this feature, the syslogd utility will
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107 | //config: write system log message to the Linux kernel's printk buffer.
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108 | //config: This can be used as a smaller alternative to the syslogd IPC
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109 | //config: support, as klogd and logread aren't needed.
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110 | //config:
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111 | //config: NOTICE: Syslog facilities in log entries needs kernel 3.5+.
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112 |
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113 | //applet:IF_SYSLOGD(APPLET(syslogd, BB_DIR_SBIN, BB_SUID_DROP))
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114 |
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115 | //kbuild:lib-$(CONFIG_SYSLOGD) += syslogd_and_logger.o
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116 |
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117 | //usage:#define syslogd_trivial_usage
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118 | //usage: "[OPTIONS]"
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119 | //usage:#define syslogd_full_usage "\n\n"
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120 | //usage: "System logging utility\n"
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121 | //usage: IF_NOT_FEATURE_SYSLOGD_CFG(
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122 | //usage: "(this version of syslogd ignores /etc/syslog.conf)\n"
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123 | //usage: )
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124 | //usage: "\n -n Run in foreground"
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125 | //usage: IF_FEATURE_REMOTE_LOG(
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126 | //usage: "\n -R HOST[:PORT] Log to HOST:PORT (default PORT:514)"
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127 | //usage: "\n -L Log locally and via network (default is network only if -R)"
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128 | //usage: )
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129 | //usage: IF_FEATURE_IPC_SYSLOG(
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130 | /* NB: -Csize shouldn't have space (because size is optional) */
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131 | //usage: "\n -C[size_kb] Log to shared mem buffer (use logread to read it)"
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132 | //usage: )
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133 | //usage: IF_FEATURE_KMSG_SYSLOG(
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134 | //usage: "\n -K Log to kernel printk buffer (use dmesg to read it)"
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135 | //usage: )
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136 | //usage: "\n -O FILE Log to FILE (default: /var/log/messages, stdout if -)"
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137 | //usage: IF_FEATURE_ROTATE_LOGFILE(
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138 | //usage: "\n -s SIZE Max size (KB) before rotation (default:200KB, 0=off)"
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139 | //usage: "\n -b N N rotated logs to keep (default:1, max=99, 0=purge)"
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140 | //usage: )
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141 | //usage: "\n -l N Log only messages more urgent than prio N (1-8)"
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142 | //usage: "\n -S Smaller output"
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143 | //usage: IF_FEATURE_SYSLOGD_DUP(
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144 | //usage: "\n -D Drop duplicates"
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145 | //usage: )
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146 | //usage: IF_FEATURE_SYSLOGD_CFG(
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147 | //usage: "\n -f FILE Use FILE as config (default:/etc/syslog.conf)"
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148 | //usage: )
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149 | /* //usage: "\n -m MIN Minutes between MARK lines (default:20, 0=off)" */
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150 | //usage:
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151 | //usage:#define syslogd_example_usage
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152 | //usage: "$ syslogd -R masterlog:514\n"
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153 | //usage: "$ syslogd -R 192.168.1.1:601\n"
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154 |
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155 | /*
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156 | * Done in syslogd_and_logger.c:
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157 | #include "libbb.h"
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158 | #define SYSLOG_NAMES
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159 | #define SYSLOG_NAMES_CONST
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160 | #include <syslog.h>
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161 | */
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162 | #ifndef _PATH_LOG
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163 | #define _PATH_LOG "/dev/log"
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164 | #endif
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165 |
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166 | #include <sys/un.h>
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167 | #include <sys/uio.h>
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168 |
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169 | #if ENABLE_FEATURE_REMOTE_LOG
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170 | #include <netinet/in.h>
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171 | #endif
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172 |
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173 | #if ENABLE_FEATURE_IPC_SYSLOG
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174 | #include <sys/ipc.h>
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175 | #include <sys/sem.h>
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176 | #include <sys/shm.h>
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177 | #endif
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178 |
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179 |
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180 | #define DEBUG 0
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181 |
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182 | /* MARK code is not very useful, is bloat, and broken:
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183 | * can deadlock if alarmed to make MARK while writing to IPC buffer
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184 | * (semaphores are down but do_mark routine tries to down them again) */
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185 | #undef SYSLOGD_MARK
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186 |
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187 | /* Write locking does not seem to be useful either */
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188 | #undef SYSLOGD_WRLOCK
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189 |
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190 | enum {
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191 | MAX_READ = CONFIG_FEATURE_SYSLOGD_READ_BUFFER_SIZE,
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192 | DNS_WAIT_SEC = 2 * 60,
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193 | };
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194 |
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195 | /* Semaphore operation structures */
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196 | struct shbuf_ds {
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197 | int32_t size; /* size of data - 1 */
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198 | int32_t tail; /* end of message list */
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199 | char data[1]; /* data/messages */
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200 | };
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201 |
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202 | #if ENABLE_FEATURE_REMOTE_LOG
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203 | typedef struct {
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204 | int remoteFD;
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205 | unsigned last_dns_resolve;
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206 | len_and_sockaddr *remoteAddr;
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207 | const char *remoteHostname;
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208 | } remoteHost_t;
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209 | #endif
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210 |
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211 | typedef struct logFile_t {
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212 | const char *path;
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213 | int fd;
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214 | time_t last_log_time;
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215 | #if ENABLE_FEATURE_ROTATE_LOGFILE
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216 | unsigned size;
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217 | uint8_t isRegular;
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218 | #endif
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219 | } logFile_t;
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220 |
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221 | #if ENABLE_FEATURE_SYSLOGD_CFG
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222 | typedef struct logRule_t {
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223 | uint8_t enabled_facility_priomap[LOG_NFACILITIES];
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224 | struct logFile_t *file;
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225 | struct logRule_t *next;
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226 | } logRule_t;
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227 | #endif
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228 |
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229 | /* Allows us to have smaller initializer. Ugly. */
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230 | #define GLOBALS \
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231 | logFile_t logFile; \
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232 | /* interval between marks in seconds */ \
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233 | /*int markInterval;*/ \
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234 | /* level of messages to be logged */ \
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235 | int logLevel; \
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236 | IF_FEATURE_ROTATE_LOGFILE( \
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237 | /* max size of file before rotation */ \
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238 | unsigned logFileSize; \
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239 | /* number of rotated message files */ \
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240 | unsigned logFileRotate; \
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241 | ) \
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242 | IF_FEATURE_IPC_SYSLOG( \
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243 | int shmid; /* ipc shared memory id */ \
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244 | int s_semid; /* ipc semaphore id */ \
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245 | int shm_size; \
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246 | struct sembuf SMwup[1]; \
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247 | struct sembuf SMwdn[3]; \
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248 | ) \
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249 | IF_FEATURE_SYSLOGD_CFG( \
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250 | logRule_t *log_rules; \
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251 | ) \
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252 | IF_FEATURE_KMSG_SYSLOG( \
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253 | int kmsgfd; \
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254 | int primask; \
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255 | )
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256 |
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257 | struct init_globals {
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258 | GLOBALS
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259 | };
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260 |
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261 | struct globals {
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262 | GLOBALS
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263 |
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264 | #if ENABLE_FEATURE_REMOTE_LOG
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265 | llist_t *remoteHosts;
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266 | #endif
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267 | #if ENABLE_FEATURE_IPC_SYSLOG
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268 | struct shbuf_ds *shbuf;
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269 | #endif
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270 | /* localhost's name. We print only first 64 chars */
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271 | char *hostname;
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272 |
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273 | /* We recv into recvbuf... */
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274 | char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)];
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275 | /* ...then copy to parsebuf, escaping control chars */
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276 | /* (can grow x2 max) */
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277 | char parsebuf[MAX_READ*2];
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278 | /* ...then sprintf into printbuf, adding timestamp (15 chars),
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279 | * host (64), fac.prio (20) to the message */
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280 | /* (growth by: 15 + 64 + 20 + delims = ~110) */
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281 | char printbuf[MAX_READ*2 + 128];
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282 | };
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283 |
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284 | static const struct init_globals init_data = {
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285 | .logFile = {
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286 | .path = "/var/log/messages",
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287 | .fd = -1,
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288 | },
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289 | #ifdef SYSLOGD_MARK
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290 | .markInterval = 20 * 60,
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291 | #endif
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292 | .logLevel = 8,
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293 | #if ENABLE_FEATURE_ROTATE_LOGFILE
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294 | .logFileSize = 200 * 1024,
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295 | .logFileRotate = 1,
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296 | #endif
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297 | #if ENABLE_FEATURE_IPC_SYSLOG
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298 | .shmid = -1,
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299 | .s_semid = -1,
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300 | .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), /* default shm size */
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301 | .SMwup = { {1, -1, IPC_NOWAIT} },
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302 | .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
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303 | #endif
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304 | };
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305 |
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306 | #define G (*ptr_to_globals)
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307 | #define INIT_G() do { \
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308 | SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \
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309 | } while (0)
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310 |
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311 |
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312 | /* Options */
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313 | enum {
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314 | OPTBIT_mark = 0, // -m
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315 | OPTBIT_nofork, // -n
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316 | OPTBIT_outfile, // -O
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317 | OPTBIT_loglevel, // -l
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318 | OPTBIT_small, // -S
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319 | IF_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
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320 | IF_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b
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321 | IF_FEATURE_REMOTE_LOG( OPTBIT_remotelog ,) // -R
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322 | IF_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L
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323 | IF_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C
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324 | IF_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D
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325 | IF_FEATURE_SYSLOGD_CFG( OPTBIT_cfg ,) // -f
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326 | IF_FEATURE_KMSG_SYSLOG( OPTBIT_kmsg ,) // -K
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327 |
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328 | OPT_mark = 1 << OPTBIT_mark ,
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329 | OPT_nofork = 1 << OPTBIT_nofork ,
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330 | OPT_outfile = 1 << OPTBIT_outfile ,
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331 | OPT_loglevel = 1 << OPTBIT_loglevel,
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332 | OPT_small = 1 << OPTBIT_small ,
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333 | OPT_filesize = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
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334 | OPT_rotatecnt = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0,
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335 | OPT_remotelog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_remotelog )) + 0,
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336 | OPT_locallog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0,
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337 | OPT_circularlog = IF_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0,
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338 | OPT_dup = IF_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup )) + 0,
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339 | OPT_cfg = IF_FEATURE_SYSLOGD_CFG( (1 << OPTBIT_cfg )) + 0,
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340 | OPT_kmsg = IF_FEATURE_KMSG_SYSLOG( (1 << OPTBIT_kmsg )) + 0,
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341 | };
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342 | #define OPTION_STR "m:nO:l:S" \
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343 | IF_FEATURE_ROTATE_LOGFILE("s:" ) \
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344 | IF_FEATURE_ROTATE_LOGFILE("b:" ) \
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345 | IF_FEATURE_REMOTE_LOG( "R:" ) \
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346 | IF_FEATURE_REMOTE_LOG( "L" ) \
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347 | IF_FEATURE_IPC_SYSLOG( "C::") \
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348 | IF_FEATURE_SYSLOGD_DUP( "D" ) \
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349 | IF_FEATURE_SYSLOGD_CFG( "f:" ) \
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350 | IF_FEATURE_KMSG_SYSLOG( "K" )
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351 | #define OPTION_DECL *opt_m, *opt_l \
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352 | IF_FEATURE_ROTATE_LOGFILE(,*opt_s) \
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353 | IF_FEATURE_ROTATE_LOGFILE(,*opt_b) \
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354 | IF_FEATURE_IPC_SYSLOG( ,*opt_C = NULL) \
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355 | IF_FEATURE_SYSLOGD_CFG( ,*opt_f = NULL)
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356 | #define OPTION_PARAM &opt_m, &(G.logFile.path), &opt_l \
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357 | IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \
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358 | IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \
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359 | IF_FEATURE_REMOTE_LOG( ,&remoteAddrList) \
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360 | IF_FEATURE_IPC_SYSLOG( ,&opt_C) \
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361 | IF_FEATURE_SYSLOGD_CFG( ,&opt_f)
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362 |
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363 |
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364 | #if ENABLE_FEATURE_SYSLOGD_CFG
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365 | static const CODE* find_by_name(char *name, const CODE* c_set)
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366 | {
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367 | for (; c_set->c_name; c_set++) {
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368 | if (strcmp(name, c_set->c_name) == 0)
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369 | return c_set;
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370 | }
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371 | return NULL;
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372 | }
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373 | #endif
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374 | static const CODE* find_by_val(int val, const CODE* c_set)
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375 | {
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376 | for (; c_set->c_name; c_set++) {
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377 | if (c_set->c_val == val)
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378 | return c_set;
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379 | }
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380 | return NULL;
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381 | }
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382 |
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383 | #if ENABLE_FEATURE_SYSLOGD_CFG
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384 | static void parse_syslogdcfg(const char *file)
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385 | {
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386 | char *t;
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387 | logRule_t **pp_rule;
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388 | /* tok[0] set of selectors */
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389 | /* tok[1] file name */
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390 | /* tok[2] has to be NULL */
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391 | char *tok[3];
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392 | parser_t *parser;
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393 |
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394 | parser = config_open2(file ? file : "/etc/syslog.conf",
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395 | file ? xfopen_for_read : fopen_for_read);
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396 | if (!parser)
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397 | /* didn't find default /etc/syslog.conf */
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398 | /* proceed as if we built busybox without config support */
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399 | return;
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400 |
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401 | /* use ptr to ptr to avoid checking whether head was initialized */
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402 | pp_rule = &G.log_rules;
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403 | /* iterate through lines of config, skipping comments */
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404 | while (config_read(parser, tok, 3, 2, "# \t", PARSE_NORMAL | PARSE_MIN_DIE)) {
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405 | char *cur_selector;
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406 | logRule_t *cur_rule;
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407 |
|
---|
408 | /* unexpected trailing token? */
|
---|
409 | if (tok[2])
|
---|
410 | goto cfgerr;
|
---|
411 |
|
---|
412 | cur_rule = *pp_rule = xzalloc(sizeof(*cur_rule));
|
---|
413 |
|
---|
414 | cur_selector = tok[0];
|
---|
415 | /* iterate through selectors: "kern.info;kern.!err;..." */
|
---|
416 | do {
|
---|
417 | const CODE *code;
|
---|
418 | char *next_selector;
|
---|
419 | uint8_t negated_prio; /* "kern.!err" */
|
---|
420 | uint8_t single_prio; /* "kern.=err" */
|
---|
421 | uint32_t facmap; /* bitmap of enabled facilities */
|
---|
422 | uint8_t primap; /* bitmap of enabled priorities */
|
---|
423 | unsigned i;
|
---|
424 |
|
---|
425 | next_selector = strchr(cur_selector, ';');
|
---|
426 | if (next_selector)
|
---|
427 | *next_selector++ = '\0';
|
---|
428 |
|
---|
429 | t = strchr(cur_selector, '.');
|
---|
430 | if (!t)
|
---|
431 | goto cfgerr;
|
---|
432 | *t++ = '\0'; /* separate facility from priority */
|
---|
433 |
|
---|
434 | negated_prio = 0;
|
---|
435 | single_prio = 0;
|
---|
436 | if (*t == '!') {
|
---|
437 | negated_prio = 1;
|
---|
438 | ++t;
|
---|
439 | }
|
---|
440 | if (*t == '=') {
|
---|
441 | single_prio = 1;
|
---|
442 | ++t;
|
---|
443 | }
|
---|
444 |
|
---|
445 | /* parse priority */
|
---|
446 | if (*t == '*')
|
---|
447 | primap = 0xff; /* all 8 log levels enabled */
|
---|
448 | else {
|
---|
449 | uint8_t priority;
|
---|
450 | code = find_by_name(t, prioritynames);
|
---|
451 | if (!code)
|
---|
452 | goto cfgerr;
|
---|
453 | primap = 0;
|
---|
454 | priority = code->c_val;
|
---|
455 | if (priority == INTERNAL_NOPRI) {
|
---|
456 | /* ensure we take "enabled_facility_priomap[fac] &= 0" branch below */
|
---|
457 | negated_prio = 1;
|
---|
458 | } else {
|
---|
459 | priority = 1 << priority;
|
---|
460 | do {
|
---|
461 | primap |= priority;
|
---|
462 | if (single_prio)
|
---|
463 | break;
|
---|
464 | priority >>= 1;
|
---|
465 | } while (priority);
|
---|
466 | if (negated_prio)
|
---|
467 | primap = ~primap;
|
---|
468 | }
|
---|
469 | }
|
---|
470 |
|
---|
471 | /* parse facility */
|
---|
472 | if (*cur_selector == '*')
|
---|
473 | facmap = (1<<LOG_NFACILITIES) - 1;
|
---|
474 | else {
|
---|
475 | char *next_facility;
|
---|
476 | facmap = 0;
|
---|
477 | t = cur_selector;
|
---|
478 | /* iterate through facilities: "kern,daemon.<priospec>" */
|
---|
479 | do {
|
---|
480 | next_facility = strchr(t, ',');
|
---|
481 | if (next_facility)
|
---|
482 | *next_facility++ = '\0';
|
---|
483 | code = find_by_name(t, facilitynames);
|
---|
484 | if (!code)
|
---|
485 | goto cfgerr;
|
---|
486 | /* "mark" is not a real facility, skip it */
|
---|
487 | if (code->c_val != INTERNAL_MARK)
|
---|
488 | facmap |= 1<<(LOG_FAC(code->c_val));
|
---|
489 | t = next_facility;
|
---|
490 | } while (t);
|
---|
491 | }
|
---|
492 |
|
---|
493 | /* merge result with previous selectors */
|
---|
494 | for (i = 0; i < LOG_NFACILITIES; ++i) {
|
---|
495 | if (!(facmap & (1<<i)))
|
---|
496 | continue;
|
---|
497 | if (negated_prio)
|
---|
498 | cur_rule->enabled_facility_priomap[i] &= primap;
|
---|
499 | else
|
---|
500 | cur_rule->enabled_facility_priomap[i] |= primap;
|
---|
501 | }
|
---|
502 |
|
---|
503 | cur_selector = next_selector;
|
---|
504 | } while (cur_selector);
|
---|
505 |
|
---|
506 | /* check whether current file name was mentioned in previous rules or
|
---|
507 | * as global logfile (G.logFile).
|
---|
508 | */
|
---|
509 | if (strcmp(G.logFile.path, tok[1]) == 0) {
|
---|
510 | cur_rule->file = &G.logFile;
|
---|
511 | goto found;
|
---|
512 | }
|
---|
513 | /* temporarily use cur_rule as iterator, but *pp_rule still points
|
---|
514 | * to currently processing rule entry.
|
---|
515 | * NOTE: *pp_rule points to the current (and last in the list) rule.
|
---|
516 | */
|
---|
517 | for (cur_rule = G.log_rules; cur_rule != *pp_rule; cur_rule = cur_rule->next) {
|
---|
518 | if (strcmp(cur_rule->file->path, tok[1]) == 0) {
|
---|
519 | /* found - reuse the same file structure */
|
---|
520 | (*pp_rule)->file = cur_rule->file;
|
---|
521 | cur_rule = *pp_rule;
|
---|
522 | goto found;
|
---|
523 | }
|
---|
524 | }
|
---|
525 | cur_rule->file = xzalloc(sizeof(*cur_rule->file));
|
---|
526 | cur_rule->file->fd = -1;
|
---|
527 | cur_rule->file->path = xstrdup(tok[1]);
|
---|
528 | found:
|
---|
529 | pp_rule = &cur_rule->next;
|
---|
530 | }
|
---|
531 | config_close(parser);
|
---|
532 | return;
|
---|
533 |
|
---|
534 | cfgerr:
|
---|
535 | bb_error_msg_and_die("error in '%s' at line %d",
|
---|
536 | file ? file : "/etc/syslog.conf",
|
---|
537 | parser->lineno);
|
---|
538 | }
|
---|
539 | #endif
|
---|
540 |
|
---|
541 | /* circular buffer variables/structures */
|
---|
542 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
543 |
|
---|
544 | #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
|
---|
545 | #error Sorry, you must set the syslogd buffer size to at least 4KB.
|
---|
546 | #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
|
---|
547 | #endif
|
---|
548 |
|
---|
549 | /* our shared key (syslogd.c and logread.c must be in sync) */
|
---|
550 | enum { KEY_ID = 0x414e4547 }; /* "GENA" */
|
---|
551 |
|
---|
552 | static void ipcsyslog_cleanup(void)
|
---|
553 | {
|
---|
554 | if (G.shmid != -1) {
|
---|
555 | shmdt(G.shbuf);
|
---|
556 | }
|
---|
557 | if (G.shmid != -1) {
|
---|
558 | shmctl(G.shmid, IPC_RMID, NULL);
|
---|
559 | }
|
---|
560 | if (G.s_semid != -1) {
|
---|
561 | semctl(G.s_semid, 0, IPC_RMID, 0);
|
---|
562 | }
|
---|
563 | }
|
---|
564 |
|
---|
565 | static void ipcsyslog_init(void)
|
---|
566 | {
|
---|
567 | if (DEBUG)
|
---|
568 | printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size);
|
---|
569 |
|
---|
570 | G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
|
---|
571 | if (G.shmid == -1) {
|
---|
572 | bb_perror_msg_and_die("shmget");
|
---|
573 | }
|
---|
574 |
|
---|
575 | G.shbuf = shmat(G.shmid, NULL, 0);
|
---|
576 | if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */
|
---|
577 | bb_perror_msg_and_die("shmat");
|
---|
578 | }
|
---|
579 |
|
---|
580 | memset(G.shbuf, 0, G.shm_size);
|
---|
581 | G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1;
|
---|
582 | /*G.shbuf->tail = 0;*/
|
---|
583 |
|
---|
584 | /* we'll trust the OS to set initial semval to 0 (let's hope) */
|
---|
585 | G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
|
---|
586 | if (G.s_semid == -1) {
|
---|
587 | if (errno == EEXIST) {
|
---|
588 | G.s_semid = semget(KEY_ID, 2, 0);
|
---|
589 | if (G.s_semid != -1)
|
---|
590 | return;
|
---|
591 | }
|
---|
592 | bb_perror_msg_and_die("semget");
|
---|
593 | }
|
---|
594 | }
|
---|
595 |
|
---|
596 | /* Write message to shared mem buffer */
|
---|
597 | static void log_to_shmem(const char *msg)
|
---|
598 | {
|
---|
599 | int old_tail, new_tail;
|
---|
600 | int len;
|
---|
601 |
|
---|
602 | if (semop(G.s_semid, G.SMwdn, 3) == -1) {
|
---|
603 | bb_perror_msg_and_die("SMwdn");
|
---|
604 | }
|
---|
605 |
|
---|
606 | /* Circular Buffer Algorithm:
|
---|
607 | * --------------------------
|
---|
608 | * tail == position where to store next syslog message.
|
---|
609 | * tail's max value is (shbuf->size - 1)
|
---|
610 | * Last byte of buffer is never used and remains NUL.
|
---|
611 | */
|
---|
612 | len = strlen(msg) + 1; /* length with NUL included */
|
---|
613 | again:
|
---|
614 | old_tail = G.shbuf->tail;
|
---|
615 | new_tail = old_tail + len;
|
---|
616 | if (new_tail < G.shbuf->size) {
|
---|
617 | /* store message, set new tail */
|
---|
618 | memcpy(G.shbuf->data + old_tail, msg, len);
|
---|
619 | G.shbuf->tail = new_tail;
|
---|
620 | } else {
|
---|
621 | /* k == available buffer space ahead of old tail */
|
---|
622 | int k = G.shbuf->size - old_tail;
|
---|
623 | /* copy what fits to the end of buffer, and repeat */
|
---|
624 | memcpy(G.shbuf->data + old_tail, msg, k);
|
---|
625 | msg += k;
|
---|
626 | len -= k;
|
---|
627 | G.shbuf->tail = 0;
|
---|
628 | goto again;
|
---|
629 | }
|
---|
630 | if (semop(G.s_semid, G.SMwup, 1) == -1) {
|
---|
631 | bb_perror_msg_and_die("SMwup");
|
---|
632 | }
|
---|
633 | if (DEBUG)
|
---|
634 | printf("tail:%d\n", G.shbuf->tail);
|
---|
635 | }
|
---|
636 | #else
|
---|
637 | static void ipcsyslog_cleanup(void) {}
|
---|
638 | static void ipcsyslog_init(void) {}
|
---|
639 | void log_to_shmem(const char *msg);
|
---|
640 | #endif /* FEATURE_IPC_SYSLOG */
|
---|
641 |
|
---|
642 | #if ENABLE_FEATURE_KMSG_SYSLOG
|
---|
643 | static void kmsg_init(void)
|
---|
644 | {
|
---|
645 | G.kmsgfd = xopen("/dev/kmsg", O_WRONLY);
|
---|
646 |
|
---|
647 | /*
|
---|
648 | * kernel < 3.5 expects single char printk KERN_* priority prefix,
|
---|
649 | * from 3.5 onwards the full syslog facility/priority format is supported
|
---|
650 | */
|
---|
651 | if (get_linux_version_code() < KERNEL_VERSION(3,5,0))
|
---|
652 | G.primask = LOG_PRIMASK;
|
---|
653 | else
|
---|
654 | G.primask = -1;
|
---|
655 | }
|
---|
656 |
|
---|
657 | static void kmsg_cleanup(void)
|
---|
658 | {
|
---|
659 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
660 | close(G.kmsgfd);
|
---|
661 | }
|
---|
662 |
|
---|
663 | /* Write message to /dev/kmsg */
|
---|
664 | static void log_to_kmsg(int pri, const char *msg)
|
---|
665 | {
|
---|
666 | /*
|
---|
667 | * kernel < 3.5 expects single char printk KERN_* priority prefix,
|
---|
668 | * from 3.5 onwards the full syslog facility/priority format is supported
|
---|
669 | */
|
---|
670 | pri &= G.primask;
|
---|
671 |
|
---|
672 | full_write(G.kmsgfd, G.printbuf, sprintf(G.printbuf, "<%d>%s\n", pri, msg));
|
---|
673 | }
|
---|
674 | #else
|
---|
675 | static void kmsg_init(void) {}
|
---|
676 | static void kmsg_cleanup(void) {}
|
---|
677 | static void log_to_kmsg(int pri UNUSED_PARAM, const char *msg UNUSED_PARAM) {}
|
---|
678 | #endif /* FEATURE_KMSG_SYSLOG */
|
---|
679 |
|
---|
680 | /* Print a message to the log file. */
|
---|
681 | static void log_locally(time_t now, char *msg, logFile_t *log_file)
|
---|
682 | {
|
---|
683 | #ifdef SYSLOGD_WRLOCK
|
---|
684 | struct flock fl;
|
---|
685 | #endif
|
---|
686 | int len = strlen(msg);
|
---|
687 |
|
---|
688 | /* fd can't be 0 (we connect fd 0 to /dev/log socket) */
|
---|
689 | /* fd is 1 if "-O -" is in use */
|
---|
690 | if (log_file->fd > 1) {
|
---|
691 | /* Reopen log files every second. This allows admin
|
---|
692 | * to delete the files and not worry about restarting us.
|
---|
693 | * This costs almost nothing since it happens
|
---|
694 | * _at most_ once a second for each file, and happens
|
---|
695 | * only when each file is actually written.
|
---|
696 | */
|
---|
697 | if (!now)
|
---|
698 | now = time(NULL);
|
---|
699 | if (log_file->last_log_time != now) {
|
---|
700 | log_file->last_log_time = now;
|
---|
701 | close(log_file->fd);
|
---|
702 | goto reopen;
|
---|
703 | }
|
---|
704 | }
|
---|
705 | else if (log_file->fd == 1) {
|
---|
706 | /* We are logging to stdout: do nothing */
|
---|
707 | }
|
---|
708 | else {
|
---|
709 | if (LONE_DASH(log_file->path)) {
|
---|
710 | log_file->fd = 1;
|
---|
711 | /* log_file->isRegular = 0; - already is */
|
---|
712 | } else {
|
---|
713 | reopen:
|
---|
714 | log_file->fd = open(log_file->path, O_WRONLY | O_CREAT
|
---|
715 | | O_NOCTTY | O_APPEND | O_NONBLOCK,
|
---|
716 | 0666);
|
---|
717 | if (log_file->fd < 0) {
|
---|
718 | /* cannot open logfile? - print to /dev/console then */
|
---|
719 | int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
|
---|
720 | if (fd < 0)
|
---|
721 | fd = 2; /* then stderr, dammit */
|
---|
722 | full_write(fd, msg, len);
|
---|
723 | if (fd != 2)
|
---|
724 | close(fd);
|
---|
725 | return;
|
---|
726 | }
|
---|
727 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
---|
728 | {
|
---|
729 | struct stat statf;
|
---|
730 | log_file->isRegular = (fstat(log_file->fd, &statf) == 0 && S_ISREG(statf.st_mode));
|
---|
731 | /* bug (mostly harmless): can wrap around if file > 4gb */
|
---|
732 | log_file->size = statf.st_size;
|
---|
733 | }
|
---|
734 | #endif
|
---|
735 | }
|
---|
736 | }
|
---|
737 |
|
---|
738 | #ifdef SYSLOGD_WRLOCK
|
---|
739 | fl.l_whence = SEEK_SET;
|
---|
740 | fl.l_start = 0;
|
---|
741 | fl.l_len = 1;
|
---|
742 | fl.l_type = F_WRLCK;
|
---|
743 | fcntl(log_file->fd, F_SETLKW, &fl);
|
---|
744 | #endif
|
---|
745 |
|
---|
746 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
---|
747 | if (G.logFileSize && log_file->isRegular && log_file->size > G.logFileSize) {
|
---|
748 | if (G.logFileRotate) { /* always 0..99 */
|
---|
749 | int i = strlen(log_file->path) + 3 + 1;
|
---|
750 | char oldFile[i];
|
---|
751 | char newFile[i];
|
---|
752 | i = G.logFileRotate - 1;
|
---|
753 | /* rename: f.8 -> f.9; f.7 -> f.8; ... */
|
---|
754 | while (1) {
|
---|
755 | sprintf(newFile, "%s.%d", log_file->path, i);
|
---|
756 | if (i == 0) break;
|
---|
757 | sprintf(oldFile, "%s.%d", log_file->path, --i);
|
---|
758 | /* ignore errors - file might be missing */
|
---|
759 | rename(oldFile, newFile);
|
---|
760 | }
|
---|
761 | /* newFile == "f.0" now */
|
---|
762 | rename(log_file->path, newFile);
|
---|
763 | }
|
---|
764 |
|
---|
765 | /* We may or may not have just renamed the file away;
|
---|
766 | * if we didn't rename because we aren't keeping any backlog,
|
---|
767 | * then it's time to clobber the file. If we did rename it...,
|
---|
768 | * incredibly, if F and F.0 are hardlinks, POSIX _demands_
|
---|
769 | * that rename returns 0 but does not remove F!!!
|
---|
770 | * (hardlinked F/F.0 pair was observed after
|
---|
771 | * power failure during rename()).
|
---|
772 | * So ensure old file is gone in any case:
|
---|
773 | */
|
---|
774 | unlink(log_file->path);
|
---|
775 | #ifdef SYSLOGD_WRLOCK
|
---|
776 | fl.l_type = F_UNLCK;
|
---|
777 | fcntl(log_file->fd, F_SETLKW, &fl);
|
---|
778 | #endif
|
---|
779 | close(log_file->fd);
|
---|
780 | goto reopen;
|
---|
781 | }
|
---|
782 | /* TODO: what to do on write errors ("disk full")? */
|
---|
783 | len = full_write(log_file->fd, msg, len);
|
---|
784 | if (len > 0)
|
---|
785 | log_file->size += len;
|
---|
786 | #else
|
---|
787 | full_write(log_file->fd, msg, len);
|
---|
788 | #endif
|
---|
789 |
|
---|
790 | #ifdef SYSLOGD_WRLOCK
|
---|
791 | fl.l_type = F_UNLCK;
|
---|
792 | fcntl(log_file->fd, F_SETLKW, &fl);
|
---|
793 | #endif
|
---|
794 | }
|
---|
795 |
|
---|
796 | static void parse_fac_prio_20(int pri, char *res20)
|
---|
797 | {
|
---|
798 | const CODE *c_pri, *c_fac;
|
---|
799 |
|
---|
800 | c_fac = find_by_val(LOG_FAC(pri) << 3, facilitynames);
|
---|
801 | if (c_fac) {
|
---|
802 | c_pri = find_by_val(LOG_PRI(pri), prioritynames);
|
---|
803 | if (c_pri) {
|
---|
804 | snprintf(res20, 20, "%s.%s", c_fac->c_name, c_pri->c_name);
|
---|
805 | return;
|
---|
806 | }
|
---|
807 | }
|
---|
808 | snprintf(res20, 20, "<%d>", pri);
|
---|
809 | }
|
---|
810 |
|
---|
811 | /* len parameter is used only for "is there a timestamp?" check.
|
---|
812 | * NB: some callers cheat and supply len==0 when they know
|
---|
813 | * that there is no timestamp, short-circuiting the test. */
|
---|
814 | static void timestamp_and_log(int pri, char *msg, int len)
|
---|
815 | {
|
---|
816 | char *timestamp;
|
---|
817 | time_t now;
|
---|
818 |
|
---|
819 | /* Jan 18 00:11:22 msg... */
|
---|
820 | /* 01234567890123456 */
|
---|
821 | if (len < 16 || msg[3] != ' ' || msg[6] != ' '
|
---|
822 | || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
|
---|
823 | ) {
|
---|
824 | time(&now);
|
---|
825 | timestamp = ctime(&now) + 4; /* skip day of week */
|
---|
826 | } else {
|
---|
827 | now = 0;
|
---|
828 | timestamp = msg;
|
---|
829 | msg += 16;
|
---|
830 | }
|
---|
831 | timestamp[15] = '\0';
|
---|
832 |
|
---|
833 | if (option_mask32 & OPT_kmsg) {
|
---|
834 | log_to_kmsg(pri, msg);
|
---|
835 | return;
|
---|
836 | }
|
---|
837 |
|
---|
838 | if (option_mask32 & OPT_small)
|
---|
839 | sprintf(G.printbuf, "%s %s\n", timestamp, msg);
|
---|
840 | else {
|
---|
841 | char res[20];
|
---|
842 | parse_fac_prio_20(pri, res);
|
---|
843 | sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg);
|
---|
844 | }
|
---|
845 |
|
---|
846 | /* Log message locally (to file or shared mem) */
|
---|
847 | #if ENABLE_FEATURE_SYSLOGD_CFG
|
---|
848 | {
|
---|
849 | bool match = 0;
|
---|
850 | logRule_t *rule;
|
---|
851 | uint8_t facility = LOG_FAC(pri);
|
---|
852 | uint8_t prio_bit = 1 << LOG_PRI(pri);
|
---|
853 |
|
---|
854 | for (rule = G.log_rules; rule; rule = rule->next) {
|
---|
855 | if (rule->enabled_facility_priomap[facility] & prio_bit) {
|
---|
856 | log_locally(now, G.printbuf, rule->file);
|
---|
857 | match = 1;
|
---|
858 | }
|
---|
859 | }
|
---|
860 | if (match)
|
---|
861 | return;
|
---|
862 | }
|
---|
863 | #endif
|
---|
864 | if (LOG_PRI(pri) < G.logLevel) {
|
---|
865 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
866 | if ((option_mask32 & OPT_circularlog) && G.shbuf) {
|
---|
867 | log_to_shmem(G.printbuf);
|
---|
868 | return;
|
---|
869 | }
|
---|
870 | #endif
|
---|
871 | log_locally(now, G.printbuf, &G.logFile);
|
---|
872 | }
|
---|
873 | }
|
---|
874 |
|
---|
875 | static void timestamp_and_log_internal(const char *msg)
|
---|
876 | {
|
---|
877 | /* -L, or no -R */
|
---|
878 | if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
|
---|
879 | return;
|
---|
880 | timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0);
|
---|
881 | }
|
---|
882 |
|
---|
883 | /* tmpbuf[len] is a NUL byte (set by caller), but there can be other,
|
---|
884 | * embedded NULs. Split messages on each of these NULs, parse prio,
|
---|
885 | * escape control chars and log each locally. */
|
---|
886 | static void split_escape_and_log(char *tmpbuf, int len)
|
---|
887 | {
|
---|
888 | char *p = tmpbuf;
|
---|
889 |
|
---|
890 | tmpbuf += len;
|
---|
891 | while (p < tmpbuf) {
|
---|
892 | char c;
|
---|
893 | char *q = G.parsebuf;
|
---|
894 | int pri = (LOG_USER | LOG_NOTICE);
|
---|
895 |
|
---|
896 | if (*p == '<') {
|
---|
897 | /* Parse the magic priority number */
|
---|
898 | pri = bb_strtou(p + 1, &p, 10);
|
---|
899 | if (*p == '>')
|
---|
900 | p++;
|
---|
901 | if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
|
---|
902 | pri = (LOG_USER | LOG_NOTICE);
|
---|
903 | }
|
---|
904 |
|
---|
905 | while ((c = *p++)) {
|
---|
906 | if (c == '\n')
|
---|
907 | c = ' ';
|
---|
908 | if (!(c & ~0x1f) && c != '\t') {
|
---|
909 | *q++ = '^';
|
---|
910 | c += '@'; /* ^@, ^A, ^B... */
|
---|
911 | }
|
---|
912 | *q++ = c;
|
---|
913 | }
|
---|
914 | *q = '\0';
|
---|
915 |
|
---|
916 | /* Now log it */
|
---|
917 | timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
|
---|
918 | }
|
---|
919 | }
|
---|
920 |
|
---|
921 | #ifdef SYSLOGD_MARK
|
---|
922 | static void do_mark(int sig)
|
---|
923 | {
|
---|
924 | if (G.markInterval) {
|
---|
925 | timestamp_and_log_internal("-- MARK --");
|
---|
926 | alarm(G.markInterval);
|
---|
927 | }
|
---|
928 | }
|
---|
929 | #endif
|
---|
930 |
|
---|
931 | /* Don't inline: prevent struct sockaddr_un to take up space on stack
|
---|
932 | * permanently */
|
---|
933 | static NOINLINE int create_socket(void)
|
---|
934 | {
|
---|
935 | struct sockaddr_un sunx;
|
---|
936 | int sock_fd;
|
---|
937 | char *dev_log_name;
|
---|
938 |
|
---|
939 | memset(&sunx, 0, sizeof(sunx));
|
---|
940 | sunx.sun_family = AF_UNIX;
|
---|
941 |
|
---|
942 | /* Unlink old /dev/log or object it points to. */
|
---|
943 | /* (if it exists, bind will fail) */
|
---|
944 | strcpy(sunx.sun_path, _PATH_LOG);
|
---|
945 | dev_log_name = xmalloc_follow_symlinks(_PATH_LOG);
|
---|
946 | if (dev_log_name) {
|
---|
947 | safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
|
---|
948 | free(dev_log_name);
|
---|
949 | }
|
---|
950 | unlink(sunx.sun_path);
|
---|
951 |
|
---|
952 | sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
|
---|
953 | xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
|
---|
954 | chmod(_PATH_LOG, 0666);
|
---|
955 |
|
---|
956 | return sock_fd;
|
---|
957 | }
|
---|
958 |
|
---|
959 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
960 | static int try_to_resolve_remote(remoteHost_t *rh)
|
---|
961 | {
|
---|
962 | if (!rh->remoteAddr) {
|
---|
963 | unsigned now = monotonic_sec();
|
---|
964 |
|
---|
965 | /* Don't resolve name too often - DNS timeouts can be big */
|
---|
966 | if ((now - rh->last_dns_resolve) < DNS_WAIT_SEC)
|
---|
967 | return -1;
|
---|
968 | rh->last_dns_resolve = now;
|
---|
969 | rh->remoteAddr = host2sockaddr(rh->remoteHostname, 514);
|
---|
970 | if (!rh->remoteAddr)
|
---|
971 | return -1;
|
---|
972 | }
|
---|
973 | return xsocket(rh->remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0);
|
---|
974 | }
|
---|
975 | #endif
|
---|
976 |
|
---|
977 | static void do_syslogd(void) NORETURN;
|
---|
978 | static void do_syslogd(void)
|
---|
979 | {
|
---|
980 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
981 | llist_t *item;
|
---|
982 | #endif
|
---|
983 | #if ENABLE_FEATURE_SYSLOGD_DUP
|
---|
984 | int last_sz = -1;
|
---|
985 | char *last_buf;
|
---|
986 | char *recvbuf = G.recvbuf;
|
---|
987 | #else
|
---|
988 | #define recvbuf (G.recvbuf)
|
---|
989 | #endif
|
---|
990 |
|
---|
991 | /* Set up signal handlers (so that they interrupt read()) */
|
---|
992 | signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo);
|
---|
993 | signal_no_SA_RESTART_empty_mask(SIGINT, record_signo);
|
---|
994 | //signal_no_SA_RESTART_empty_mask(SIGQUIT, record_signo);
|
---|
995 | signal(SIGHUP, SIG_IGN);
|
---|
996 | #ifdef SYSLOGD_MARK
|
---|
997 | signal(SIGALRM, do_mark);
|
---|
998 | alarm(G.markInterval);
|
---|
999 | #endif
|
---|
1000 | xmove_fd(create_socket(), STDIN_FILENO);
|
---|
1001 |
|
---|
1002 | if (option_mask32 & OPT_circularlog)
|
---|
1003 | ipcsyslog_init();
|
---|
1004 |
|
---|
1005 | if (option_mask32 & OPT_kmsg)
|
---|
1006 | kmsg_init();
|
---|
1007 |
|
---|
1008 | timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
|
---|
1009 |
|
---|
1010 | while (!bb_got_signal) {
|
---|
1011 | ssize_t sz;
|
---|
1012 |
|
---|
1013 | #if ENABLE_FEATURE_SYSLOGD_DUP
|
---|
1014 | last_buf = recvbuf;
|
---|
1015 | if (recvbuf == G.recvbuf)
|
---|
1016 | recvbuf = G.recvbuf + MAX_READ;
|
---|
1017 | else
|
---|
1018 | recvbuf = G.recvbuf;
|
---|
1019 | #endif
|
---|
1020 | read_again:
|
---|
1021 | sz = read(STDIN_FILENO, recvbuf, MAX_READ - 1);
|
---|
1022 | if (sz < 0) {
|
---|
1023 | if (!bb_got_signal)
|
---|
1024 | bb_perror_msg("read from %s", _PATH_LOG);
|
---|
1025 | break;
|
---|
1026 | }
|
---|
1027 |
|
---|
1028 | /* Drop trailing '\n' and NULs (typically there is one NUL) */
|
---|
1029 | while (1) {
|
---|
1030 | if (sz == 0)
|
---|
1031 | goto read_again;
|
---|
1032 | /* man 3 syslog says: "A trailing newline is added when needed".
|
---|
1033 | * However, neither glibc nor uclibc do this:
|
---|
1034 | * syslog(prio, "test") sends "test\0" to /dev/log,
|
---|
1035 | * syslog(prio, "test\n") sends "test\n\0".
|
---|
1036 | * IOW: newline is passed verbatim!
|
---|
1037 | * I take it to mean that it's syslogd's job
|
---|
1038 | * to make those look identical in the log files. */
|
---|
1039 | if (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n')
|
---|
1040 | break;
|
---|
1041 | sz--;
|
---|
1042 | }
|
---|
1043 | #if ENABLE_FEATURE_SYSLOGD_DUP
|
---|
1044 | if ((option_mask32 & OPT_dup) && (sz == last_sz))
|
---|
1045 | if (memcmp(last_buf, recvbuf, sz) == 0)
|
---|
1046 | continue;
|
---|
1047 | last_sz = sz;
|
---|
1048 | #endif
|
---|
1049 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
1050 | /* Stock syslogd sends it '\n'-terminated
|
---|
1051 | * over network, mimic that */
|
---|
1052 | recvbuf[sz] = '\n';
|
---|
1053 |
|
---|
1054 | /* We are not modifying log messages in any way before send */
|
---|
1055 | /* Remote site cannot trust _us_ anyway and need to do validation again */
|
---|
1056 | for (item = G.remoteHosts; item != NULL; item = item->link) {
|
---|
1057 | remoteHost_t *rh = (remoteHost_t *)item->data;
|
---|
1058 |
|
---|
1059 | if (rh->remoteFD == -1) {
|
---|
1060 | rh->remoteFD = try_to_resolve_remote(rh);
|
---|
1061 | if (rh->remoteFD == -1)
|
---|
1062 | continue;
|
---|
1063 | }
|
---|
1064 |
|
---|
1065 | /* Send message to remote logger.
|
---|
1066 | * On some errors, close and set remoteFD to -1
|
---|
1067 | * so that DNS resolution is retried.
|
---|
1068 | */
|
---|
1069 | if (sendto(rh->remoteFD, recvbuf, sz+1,
|
---|
1070 | MSG_DONTWAIT | MSG_NOSIGNAL,
|
---|
1071 | &(rh->remoteAddr->u.sa), rh->remoteAddr->len) == -1
|
---|
1072 | ) {
|
---|
1073 | switch (errno) {
|
---|
1074 | case ECONNRESET:
|
---|
1075 | case ENOTCONN: /* paranoia */
|
---|
1076 | case EPIPE:
|
---|
1077 | close(rh->remoteFD);
|
---|
1078 | rh->remoteFD = -1;
|
---|
1079 | free(rh->remoteAddr);
|
---|
1080 | rh->remoteAddr = NULL;
|
---|
1081 | }
|
---|
1082 | }
|
---|
1083 | }
|
---|
1084 | #endif
|
---|
1085 | if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
|
---|
1086 | recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
|
---|
1087 | split_escape_and_log(recvbuf, sz);
|
---|
1088 | }
|
---|
1089 | } /* while (!bb_got_signal) */
|
---|
1090 |
|
---|
1091 | timestamp_and_log_internal("syslogd exiting");
|
---|
1092 | remove_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
|
---|
1093 | ipcsyslog_cleanup();
|
---|
1094 | if (option_mask32 & OPT_kmsg)
|
---|
1095 | kmsg_cleanup();
|
---|
1096 | kill_myself_with_sig(bb_got_signal);
|
---|
1097 | #undef recvbuf
|
---|
1098 | }
|
---|
1099 |
|
---|
1100 | int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
1101 | int syslogd_main(int argc UNUSED_PARAM, char **argv)
|
---|
1102 | {
|
---|
1103 | int opts;
|
---|
1104 | char OPTION_DECL;
|
---|
1105 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
1106 | llist_t *remoteAddrList = NULL;
|
---|
1107 | #endif
|
---|
1108 |
|
---|
1109 | INIT_G();
|
---|
1110 |
|
---|
1111 | /* No non-option params, -R can occur multiple times */
|
---|
1112 | opt_complementary = "=0" IF_FEATURE_REMOTE_LOG(":R::");
|
---|
1113 | opts = getopt32(argv, OPTION_STR, OPTION_PARAM);
|
---|
1114 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
1115 | while (remoteAddrList) {
|
---|
1116 | remoteHost_t *rh = xzalloc(sizeof(*rh));
|
---|
1117 | rh->remoteHostname = llist_pop(&remoteAddrList);
|
---|
1118 | rh->remoteFD = -1;
|
---|
1119 | rh->last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1;
|
---|
1120 | llist_add_to(&G.remoteHosts, rh);
|
---|
1121 | }
|
---|
1122 | #endif
|
---|
1123 |
|
---|
1124 | #ifdef SYSLOGD_MARK
|
---|
1125 | if (opts & OPT_mark) // -m
|
---|
1126 | G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
|
---|
1127 | #endif
|
---|
1128 | //if (opts & OPT_nofork) // -n
|
---|
1129 | //if (opts & OPT_outfile) // -O
|
---|
1130 | if (opts & OPT_loglevel) // -l
|
---|
1131 | G.logLevel = xatou_range(opt_l, 1, 8);
|
---|
1132 | //if (opts & OPT_small) // -S
|
---|
1133 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
---|
1134 | if (opts & OPT_filesize) // -s
|
---|
1135 | G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
|
---|
1136 | if (opts & OPT_rotatecnt) // -b
|
---|
1137 | G.logFileRotate = xatou_range(opt_b, 0, 99);
|
---|
1138 | #endif
|
---|
1139 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
1140 | if (opt_C) // -Cn
|
---|
1141 | G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
|
---|
1142 | #endif
|
---|
1143 | /* If they have not specified remote logging, then log locally */
|
---|
1144 | if (ENABLE_FEATURE_REMOTE_LOG && !(opts & OPT_remotelog)) // -R
|
---|
1145 | option_mask32 |= OPT_locallog;
|
---|
1146 | #if ENABLE_FEATURE_SYSLOGD_CFG
|
---|
1147 | parse_syslogdcfg(opt_f);
|
---|
1148 | #endif
|
---|
1149 |
|
---|
1150 | /* Store away localhost's name before the fork */
|
---|
1151 | G.hostname = safe_gethostname();
|
---|
1152 | *strchrnul(G.hostname, '.') = '\0';
|
---|
1153 |
|
---|
1154 | if (!(opts & OPT_nofork)) {
|
---|
1155 | bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
|
---|
1156 | }
|
---|
1157 |
|
---|
1158 | //umask(0); - why??
|
---|
1159 | write_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
|
---|
1160 |
|
---|
1161 | do_syslogd();
|
---|
1162 | /* return EXIT_SUCCESS; */
|
---|
1163 | }
|
---|
1164 |
|
---|
1165 | /* Clean up. Needed because we are included from syslogd_and_logger.c */
|
---|
1166 | #undef DEBUG
|
---|
1167 | #undef SYSLOGD_MARK
|
---|
1168 | #undef SYSLOGD_WRLOCK
|
---|
1169 | #undef G
|
---|
1170 | #undef GLOBALS
|
---|
1171 | #undef INIT_G
|
---|
1172 | #undef OPTION_STR
|
---|
1173 | #undef OPTION_DECL
|
---|
1174 | #undef OPTION_PARAM
|
---|