[821] | 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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[2725] | 13 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 14 | */
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[3621] | 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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[821] | 112 |
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[3621] | 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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[3232] | 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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[3621] | 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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[3232] | 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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[3621] | 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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[3232] | 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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[2725] | 155 | /*
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| 156 | * Done in syslogd_and_logger.c:
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[1765] | 157 | #include "libbb.h"
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[2725] | 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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[3621] | 162 | #ifndef _PATH_LOG
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| 163 | #define _PATH_LOG "/dev/log"
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| 164 | #endif
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[2725] | 165 |
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[821] | 166 | #include <sys/un.h>
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| 167 | #include <sys/uio.h>
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| 168 |
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[1765] | 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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[821] | 172 |
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[1765] | 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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[821] | 178 |
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| 179 |
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[1765] | 180 | #define DEBUG 0
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[821] | 181 |
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[1765] | 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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[821] | 186 |
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[2725] | 187 | /* Write locking does not seem to be useful either */
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| 188 | #undef SYSLOGD_WRLOCK
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[821] | 189 |
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[2725] | 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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[1765] | 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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[821] | 201 |
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[2725] | 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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[3232] | 211 | typedef struct logFile_t {
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| 212 | const char *path;
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| 213 | int fd;
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[3621] | 214 | time_t last_log_time;
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[3232] | 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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[1765] | 229 | /* Allows us to have smaller initializer. Ugly. */
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| 230 | #define GLOBALS \
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[3232] | 231 | logFile_t logFile; \
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[1765] | 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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[2725] | 236 | IF_FEATURE_ROTATE_LOGFILE( \
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[1765] | 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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[2725] | 242 | IF_FEATURE_IPC_SYSLOG( \
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[1765] | 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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[3232] | 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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[1765] | 255 | )
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[821] | 256 |
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[1765] | 257 | struct init_globals {
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| 258 | GLOBALS
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| 259 | };
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[821] | 260 |
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[1765] | 261 | struct globals {
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| 262 | GLOBALS
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[2725] | 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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[1765] | 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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[2725] | 270 | /* localhost's name. We print only first 64 chars */
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| 271 | char *hostname;
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[821] | 272 |
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[1765] | 273 | /* We recv into recvbuf... */
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[2725] | 274 | char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)];
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[1765] | 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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[3232] | 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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[1765] | 289 | #ifdef SYSLOGD_MARK
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| 290 | .markInterval = 20 * 60,
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[821] | 291 | #endif
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[1765] | 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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[3232] | 300 | .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), /* default shm size */
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[1765] | 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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[821] | 305 |
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[1765] | 306 | #define G (*ptr_to_globals)
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[2725] | 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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[821] | 310 |
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| 311 |
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[1765] | 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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[2725] | 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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[3232] | 325 | IF_FEATURE_SYSLOGD_CFG( OPTBIT_cfg ,) // -f
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| 326 | IF_FEATURE_KMSG_SYSLOG( OPTBIT_kmsg ,) // -K
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[821] | 327 |
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[1765] | 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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[2725] | 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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[3232] | 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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[1765] | 341 | };
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| 342 | #define OPTION_STR "m:nO:l:S" \
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[2725] | 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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[3232] | 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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[1765] | 351 | #define OPTION_DECL *opt_m, *opt_l \
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[2725] | 352 | IF_FEATURE_ROTATE_LOGFILE(,*opt_s) \
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| 353 | IF_FEATURE_ROTATE_LOGFILE(,*opt_b) \
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[3232] | 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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[2725] | 357 | IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \
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| 358 | IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \
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[3232] | 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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[821] | 362 |
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[1765] | 363 |
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[3232] | 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)
|
---|
| 369 | return c_set;
|
---|
| 370 | }
|
---|
| 371 | return NULL;
|
---|
| 372 | }
|
---|
| 373 | #endif
|
---|
| 374 | static const CODE* find_by_val(int val, const CODE* c_set)
|
---|
| 375 | {
|
---|
| 376 | for (; c_set->c_name; c_set++) {
|
---|
| 377 | if (c_set->c_val == val)
|
---|
| 378 | return c_set;
|
---|
| 379 | }
|
---|
| 380 | return NULL;
|
---|
| 381 | }
|
---|
| 382 |
|
---|
| 383 | #if ENABLE_FEATURE_SYSLOGD_CFG
|
---|
| 384 | static void parse_syslogdcfg(const char *file)
|
---|
| 385 | {
|
---|
| 386 | char *t;
|
---|
| 387 | logRule_t **pp_rule;
|
---|
| 388 | /* tok[0] set of selectors */
|
---|
| 389 | /* tok[1] file name */
|
---|
| 390 | /* tok[2] has to be NULL */
|
---|
| 391 | char *tok[3];
|
---|
| 392 | parser_t *parser;
|
---|
| 393 |
|
---|
| 394 | parser = config_open2(file ? file : "/etc/syslog.conf",
|
---|
| 395 | file ? xfopen_for_read : fopen_for_read);
|
---|
| 396 | if (!parser)
|
---|
| 397 | /* didn't find default /etc/syslog.conf */
|
---|
| 398 | /* proceed as if we built busybox without config support */
|
---|
| 399 | return;
|
---|
| 400 |
|
---|
| 401 | /* use ptr to ptr to avoid checking whether head was initialized */
|
---|
| 402 | pp_rule = &G.log_rules;
|
---|
| 403 | /* iterate through lines of config, skipping comments */
|
---|
| 404 | while (config_read(parser, tok, 3, 2, "# \t", PARSE_NORMAL | PARSE_MIN_DIE)) {
|
---|
| 405 | char *cur_selector;
|
---|
| 406 | logRule_t *cur_rule;
|
---|
| 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 |
|
---|
[821] | 541 | /* circular buffer variables/structures */
|
---|
[1765] | 542 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
[821] | 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 |
|
---|
[2725] | 549 | /* our shared key (syslogd.c and logread.c must be in sync) */
|
---|
| 550 | enum { KEY_ID = 0x414e4547 }; /* "GENA" */
|
---|
[821] | 551 |
|
---|
| 552 | static void ipcsyslog_cleanup(void)
|
---|
| 553 | {
|
---|
[1765] | 554 | if (G.shmid != -1) {
|
---|
| 555 | shmdt(G.shbuf);
|
---|
[821] | 556 | }
|
---|
[1765] | 557 | if (G.shmid != -1) {
|
---|
| 558 | shmctl(G.shmid, IPC_RMID, NULL);
|
---|
[821] | 559 | }
|
---|
[1765] | 560 | if (G.s_semid != -1) {
|
---|
| 561 | semctl(G.s_semid, 0, IPC_RMID, 0);
|
---|
[821] | 562 | }
|
---|
| 563 | }
|
---|
| 564 |
|
---|
| 565 | static void ipcsyslog_init(void)
|
---|
| 566 | {
|
---|
[1765] | 567 | if (DEBUG)
|
---|
[2725] | 568 | printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size);
|
---|
[821] | 569 |
|
---|
[1765] | 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 | }
|
---|
[821] | 574 |
|
---|
[1765] | 575 | G.shbuf = shmat(G.shmid, NULL, 0);
|
---|
[2725] | 576 | if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */
|
---|
[1765] | 577 | bb_perror_msg_and_die("shmat");
|
---|
| 578 | }
|
---|
[821] | 579 |
|
---|
[1765] | 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 |
|
---|
[3232] | 584 | /* we'll trust the OS to set initial semval to 0 (let's hope) */
|
---|
[1765] | 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;
|
---|
[821] | 591 | }
|
---|
[1765] | 592 | bb_perror_msg_and_die("semget");
|
---|
[821] | 593 | }
|
---|
| 594 | }
|
---|
| 595 |
|
---|
[1765] | 596 | /* Write message to shared mem buffer */
|
---|
[3232] | 597 | static void log_to_shmem(const char *msg)
|
---|
[821] | 598 | {
|
---|
[1765] | 599 | int old_tail, new_tail;
|
---|
[3232] | 600 | int len;
|
---|
[821] | 601 |
|
---|
[1765] | 602 | if (semop(G.s_semid, G.SMwdn, 3) == -1) {
|
---|
| 603 | bb_perror_msg_and_die("SMwdn");
|
---|
| 604 | }
|
---|
[821] | 605 |
|
---|
[1765] | 606 | /* Circular Buffer Algorithm:
|
---|
[821] | 607 | * --------------------------
|
---|
[1765] | 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.
|
---|
[821] | 611 | */
|
---|
[3232] | 612 | len = strlen(msg) + 1; /* length with NUL included */
|
---|
[1765] | 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;
|
---|
[821] | 620 | } else {
|
---|
[1765] | 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;
|
---|
[821] | 629 | }
|
---|
[1765] | 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);
|
---|
[821] | 635 | }
|
---|
[1765] | 636 | #else
|
---|
[3232] | 637 | static void ipcsyslog_cleanup(void) {}
|
---|
| 638 | static void ipcsyslog_init(void) {}
|
---|
[1765] | 639 | void log_to_shmem(const char *msg);
|
---|
| 640 | #endif /* FEATURE_IPC_SYSLOG */
|
---|
[821] | 641 |
|
---|
[3232] | 642 | #if ENABLE_FEATURE_KMSG_SYSLOG
|
---|
| 643 | static void kmsg_init(void)
|
---|
| 644 | {
|
---|
| 645 | G.kmsgfd = xopen("/dev/kmsg", O_WRONLY);
|
---|
[1765] | 646 |
|
---|
[3232] | 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 |
|
---|
[3621] | 672 | full_write(G.kmsgfd, G.printbuf, sprintf(G.printbuf, "<%d>%s\n", pri, msg));
|
---|
[3232] | 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 |
|
---|
[821] | 680 | /* Print a message to the log file. */
|
---|
[3232] | 681 | static void log_locally(time_t now, char *msg, logFile_t *log_file)
|
---|
[821] | 682 | {
|
---|
[2725] | 683 | #ifdef SYSLOGD_WRLOCK
|
---|
[821] | 684 | struct flock fl;
|
---|
[2725] | 685 | #endif
|
---|
[1765] | 686 | int len = strlen(msg);
|
---|
[821] | 687 |
|
---|
[3621] | 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.
|
---|
[2725] | 693 | * This costs almost nothing since it happens
|
---|
[3621] | 694 | * _at most_ once a second for each file, and happens
|
---|
| 695 | * only when each file is actually written.
|
---|
[2725] | 696 | */
|
---|
| 697 | if (!now)
|
---|
| 698 | now = time(NULL);
|
---|
[3621] | 699 | if (log_file->last_log_time != now) {
|
---|
| 700 | log_file->last_log_time = now;
|
---|
[3232] | 701 | close(log_file->fd);
|
---|
[1765] | 702 | goto reopen;
|
---|
| 703 | }
|
---|
[3621] | 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 {
|
---|
[1765] | 713 | reopen:
|
---|
[3621] | 714 | log_file->fd = open(log_file->path, O_WRONLY | O_CREAT
|
---|
[2725] | 715 | | O_NOCTTY | O_APPEND | O_NONBLOCK,
|
---|
| 716 | 0666);
|
---|
[3621] | 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 | }
|
---|
[1765] | 727 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
---|
[3621] | 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
|
---|
[1765] | 735 | }
|
---|
| 736 | }
|
---|
| 737 |
|
---|
[2725] | 738 | #ifdef SYSLOGD_WRLOCK
|
---|
[821] | 739 | fl.l_whence = SEEK_SET;
|
---|
| 740 | fl.l_start = 0;
|
---|
| 741 | fl.l_len = 1;
|
---|
[1765] | 742 | fl.l_type = F_WRLCK;
|
---|
[3232] | 743 | fcntl(log_file->fd, F_SETLKW, &fl);
|
---|
[2725] | 744 | #endif
|
---|
[821] | 745 |
|
---|
[1765] | 746 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
---|
[3232] | 747 | if (G.logFileSize && log_file->isRegular && log_file->size > G.logFileSize) {
|
---|
[1765] | 748 | if (G.logFileRotate) { /* always 0..99 */
|
---|
[3232] | 749 | int i = strlen(log_file->path) + 3 + 1;
|
---|
[1765] | 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) {
|
---|
[3232] | 755 | sprintf(newFile, "%s.%d", log_file->path, i);
|
---|
[1765] | 756 | if (i == 0) break;
|
---|
[3232] | 757 | sprintf(oldFile, "%s.%d", log_file->path, --i);
|
---|
[2725] | 758 | /* ignore errors - file might be missing */
|
---|
[1765] | 759 | rename(oldFile, newFile);
|
---|
| 760 | }
|
---|
| 761 | /* newFile == "f.0" now */
|
---|
[3232] | 762 | rename(log_file->path, newFile);
|
---|
[3621] | 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);
|
---|
[2725] | 775 | #ifdef SYSLOGD_WRLOCK
|
---|
[3621] | 776 | fl.l_type = F_UNLCK;
|
---|
| 777 | fcntl(log_file->fd, F_SETLKW, &fl);
|
---|
[2725] | 778 | #endif
|
---|
[3621] | 779 | close(log_file->fd);
|
---|
| 780 | goto reopen;
|
---|
[1765] | 781 | }
|
---|
[3621] | 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);
|
---|
[1765] | 788 | #endif
|
---|
[3621] | 789 |
|
---|
[2725] | 790 | #ifdef SYSLOGD_WRLOCK
|
---|
[1765] | 791 | fl.l_type = F_UNLCK;
|
---|
[3232] | 792 | fcntl(log_file->fd, F_SETLKW, &fl);
|
---|
[2725] | 793 | #endif
|
---|
[1765] | 794 | }
|
---|
[821] | 795 |
|
---|
[1765] | 796 | static void parse_fac_prio_20(int pri, char *res20)
|
---|
| 797 | {
|
---|
| 798 | const CODE *c_pri, *c_fac;
|
---|
[821] | 799 |
|
---|
[3232] | 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;
|
---|
[821] | 806 | }
|
---|
| 807 | }
|
---|
[3232] | 808 | snprintf(res20, 20, "<%d>", pri);
|
---|
[821] | 809 | }
|
---|
| 810 |
|
---|
[1765] | 811 | /* len parameter is used only for "is there a timestamp?" check.
|
---|
[2725] | 812 | * NB: some callers cheat and supply len==0 when they know
|
---|
| 813 | * that there is no timestamp, short-circuiting the test. */
|
---|
[1765] | 814 | static void timestamp_and_log(int pri, char *msg, int len)
|
---|
[821] | 815 | {
|
---|
| 816 | char *timestamp;
|
---|
[2725] | 817 | time_t now;
|
---|
[821] | 818 |
|
---|
[2725] | 819 | /* Jan 18 00:11:22 msg... */
|
---|
| 820 | /* 01234567890123456 */
|
---|
[1765] | 821 | if (len < 16 || msg[3] != ' ' || msg[6] != ' '
|
---|
| 822 | || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
|
---|
| 823 | ) {
|
---|
[821] | 824 | time(&now);
|
---|
[2725] | 825 | timestamp = ctime(&now) + 4; /* skip day of week */
|
---|
[821] | 826 | } else {
|
---|
[2725] | 827 | now = 0;
|
---|
[821] | 828 | timestamp = msg;
|
---|
| 829 | msg += 16;
|
---|
| 830 | }
|
---|
[1765] | 831 | timestamp[15] = '\0';
|
---|
[821] | 832 |
|
---|
[3232] | 833 | if (option_mask32 & OPT_kmsg) {
|
---|
| 834 | log_to_kmsg(pri, msg);
|
---|
| 835 | return;
|
---|
| 836 | }
|
---|
| 837 |
|
---|
[2725] | 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 |
|
---|
[1765] | 846 | /* Log message locally (to file or shared mem) */
|
---|
[3232] | 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 | }
|
---|
[821] | 873 | }
|
---|
| 874 |
|
---|
[2725] | 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. */
|
---|
[1765] | 886 | static void split_escape_and_log(char *tmpbuf, int len)
|
---|
[821] | 887 | {
|
---|
| 888 | char *p = tmpbuf;
|
---|
| 889 |
|
---|
[1765] | 890 | tmpbuf += len;
|
---|
| 891 | while (p < tmpbuf) {
|
---|
| 892 | char c;
|
---|
| 893 | char *q = G.parsebuf;
|
---|
[821] | 894 | int pri = (LOG_USER | LOG_NOTICE);
|
---|
| 895 |
|
---|
[1765] | 896 | if (*p == '<') {
|
---|
| 897 | /* Parse the magic priority number */
|
---|
| 898 | pri = bb_strtou(p + 1, &p, 10);
|
---|
[2725] | 899 | if (*p == '>')
|
---|
| 900 | p++;
|
---|
| 901 | if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
|
---|
[1765] | 902 | pri = (LOG_USER | LOG_NOTICE);
|
---|
| 903 | }
|
---|
| 904 |
|
---|
| 905 | while ((c = *p++)) {
|
---|
| 906 | if (c == '\n')
|
---|
| 907 | c = ' ';
|
---|
| 908 | if (!(c & ~0x1f) && c != '\t') {
|
---|
[821] | 909 | *q++ = '^';
|
---|
[1765] | 910 | c += '@'; /* ^@, ^A, ^B... */
|
---|
[821] | 911 | }
|
---|
[1765] | 912 | *q++ = c;
|
---|
[821] | 913 | }
|
---|
| 914 | *q = '\0';
|
---|
[2725] | 915 |
|
---|
[821] | 916 | /* Now log it */
|
---|
[3232] | 917 | timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
|
---|
[821] | 918 | }
|
---|
| 919 | }
|
---|
| 920 |
|
---|
[1765] | 921 | #ifdef SYSLOGD_MARK
|
---|
| 922 | static void do_mark(int sig)
|
---|
| 923 | {
|
---|
| 924 | if (G.markInterval) {
|
---|
[2725] | 925 | timestamp_and_log_internal("-- MARK --");
|
---|
[1765] | 926 | alarm(G.markInterval);
|
---|
| 927 | }
|
---|
| 928 | }
|
---|
| 929 | #endif
|
---|
| 930 |
|
---|
[2725] | 931 | /* Don't inline: prevent struct sockaddr_un to take up space on stack
|
---|
| 932 | * permanently */
|
---|
| 933 | static NOINLINE int create_socket(void)
|
---|
[1765] | 934 | {
|
---|
[821] | 935 | struct sockaddr_un sunx;
|
---|
| 936 | int sock_fd;
|
---|
[1765] | 937 | char *dev_log_name;
|
---|
[821] | 938 |
|
---|
| 939 | memset(&sunx, 0, sizeof(sunx));
|
---|
| 940 | sunx.sun_family = AF_UNIX;
|
---|
[1765] | 941 |
|
---|
| 942 | /* Unlink old /dev/log or object it points to. */
|
---|
| 943 | /* (if it exists, bind will fail) */
|
---|
[3621] | 944 | strcpy(sunx.sun_path, _PATH_LOG);
|
---|
| 945 | dev_log_name = xmalloc_follow_symlinks(_PATH_LOG);
|
---|
[1765] | 946 | if (dev_log_name) {
|
---|
| 947 | safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
|
---|
| 948 | free(dev_log_name);
|
---|
[821] | 949 | }
|
---|
[2725] | 950 | unlink(sunx.sun_path);
|
---|
[821] | 951 |
|
---|
[1765] | 952 | sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
|
---|
| 953 | xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
|
---|
[3621] | 954 | chmod(_PATH_LOG, 0666);
|
---|
[1765] | 955 |
|
---|
[2725] | 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;
|
---|
[821] | 972 | }
|
---|
[2725] | 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
|
---|
[3621] | 1000 | xmove_fd(create_socket(), STDIN_FILENO);
|
---|
[2725] | 1001 |
|
---|
[3232] | 1002 | if (option_mask32 & OPT_circularlog)
|
---|
[821] | 1003 | ipcsyslog_init();
|
---|
| 1004 |
|
---|
[3232] | 1005 | if (option_mask32 & OPT_kmsg)
|
---|
| 1006 | kmsg_init();
|
---|
| 1007 |
|
---|
[2725] | 1008 | timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
|
---|
[821] | 1009 |
|
---|
[2725] | 1010 | while (!bb_got_signal) {
|
---|
| 1011 | ssize_t sz;
|
---|
[821] | 1012 |
|
---|
[2725] | 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:
|
---|
[3621] | 1021 | sz = read(STDIN_FILENO, recvbuf, MAX_READ - 1);
|
---|
[2725] | 1022 | if (sz < 0) {
|
---|
| 1023 | if (!bb_got_signal)
|
---|
[3621] | 1024 | bb_perror_msg("read from %s", _PATH_LOG);
|
---|
[2725] | 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)
|
---|
[821] | 1046 | continue;
|
---|
[2725] | 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;
|
---|
[821] | 1063 | }
|
---|
| 1064 |
|
---|
[2725] | 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;
|
---|
[1765] | 1081 | }
|
---|
[821] | 1082 | }
|
---|
[2725] | 1083 | }
|
---|
[1765] | 1084 | #endif
|
---|
[2725] | 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");
|
---|
[3232] | 1092 | remove_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
|
---|
| 1093 | ipcsyslog_cleanup();
|
---|
| 1094 | if (option_mask32 & OPT_kmsg)
|
---|
| 1095 | kmsg_cleanup();
|
---|
[2725] | 1096 | kill_myself_with_sig(bb_got_signal);
|
---|
| 1097 | #undef recvbuf
|
---|
[821] | 1098 | }
|
---|
| 1099 |
|
---|
[2725] | 1100 | int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 1101 | int syslogd_main(int argc UNUSED_PARAM, char **argv)
|
---|
[821] | 1102 | {
|
---|
[2725] | 1103 | int opts;
|
---|
[1765] | 1104 | char OPTION_DECL;
|
---|
[2725] | 1105 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
| 1106 | llist_t *remoteAddrList = NULL;
|
---|
| 1107 | #endif
|
---|
[821] | 1108 |
|
---|
[2725] | 1109 | INIT_G();
|
---|
[821] | 1110 |
|
---|
[2725] | 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 |
|
---|
[1765] | 1124 | #ifdef SYSLOGD_MARK
|
---|
[2725] | 1125 | if (opts & OPT_mark) // -m
|
---|
[1765] | 1126 | G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
|
---|
[821] | 1127 | #endif
|
---|
[2725] | 1128 | //if (opts & OPT_nofork) // -n
|
---|
| 1129 | //if (opts & OPT_outfile) // -O
|
---|
| 1130 | if (opts & OPT_loglevel) // -l
|
---|
[1765] | 1131 | G.logLevel = xatou_range(opt_l, 1, 8);
|
---|
[2725] | 1132 | //if (opts & OPT_small) // -S
|
---|
[1765] | 1133 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
---|
[2725] | 1134 | if (opts & OPT_filesize) // -s
|
---|
[1765] | 1135 | G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
|
---|
[2725] | 1136 | if (opts & OPT_rotatecnt) // -b
|
---|
[1765] | 1137 | G.logFileRotate = xatou_range(opt_b, 0, 99);
|
---|
[821] | 1138 | #endif
|
---|
[1765] | 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
|
---|
[821] | 1143 | /* If they have not specified remote logging, then log locally */
|
---|
[2725] | 1144 | if (ENABLE_FEATURE_REMOTE_LOG && !(opts & OPT_remotelog)) // -R
|
---|
[1765] | 1145 | option_mask32 |= OPT_locallog;
|
---|
[3232] | 1146 | #if ENABLE_FEATURE_SYSLOGD_CFG
|
---|
| 1147 | parse_syslogdcfg(opt_f);
|
---|
| 1148 | #endif
|
---|
[821] | 1149 |
|
---|
| 1150 | /* Store away localhost's name before the fork */
|
---|
[2725] | 1151 | G.hostname = safe_gethostname();
|
---|
| 1152 | *strchrnul(G.hostname, '.') = '\0';
|
---|
[821] | 1153 |
|
---|
[2725] | 1154 | if (!(opts & OPT_nofork)) {
|
---|
[1765] | 1155 | bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
|
---|
| 1156 | }
|
---|
[3232] | 1157 |
|
---|
[2725] | 1158 | //umask(0); - why??
|
---|
[3232] | 1159 | write_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
|
---|
| 1160 |
|
---|
[1765] | 1161 | do_syslogd();
|
---|
| 1162 | /* return EXIT_SUCCESS; */
|
---|
[821] | 1163 | }
|
---|
[2725] | 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
|
---|