src/server/daemon/log.c

Fri, 28 Jun 2013 14:52:35 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Fri, 28 Jun 2013 14:52:35 +0200
changeset 81
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parent 79
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child 82
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permissions
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preparation for admin interface

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2013 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #ifdef __gnu_linux__
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30 #define _GNU_SOURCE
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31 #endif
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32
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33 #include <stdio.h>
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34 #include <stdlib.h>
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35 #include <string.h>
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36 #include <unistd.h>
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37 #include <aio.h>
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38 #include <time.h>
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39
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40 #include "log.h"
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41 #include "../util/strbuf.h"
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42 #include "../util/io.h"
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43 #include "../ucx/map.h"
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44 #include "../util/atomic.h"
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45
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46 static int is_initialized = 0;
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47
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48 static int log_file_fd;
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49 static int log_level = 0;
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50
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51 /*
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52 * if the log file is uninitialized, output is written to the ui_buffer
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53 */
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54 static sbuf_t *ui_buffer = NULL;
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55
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56 /*
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57 * access log file map
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58 */
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59 static UcxMap *access_log_files; // map of LogFile*
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60
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61
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62 static char *log_date_month[] = {
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63 "Jan",
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64 "Feb",
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65 "Mar",
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66 "Apr",
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67 "May",
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68 "Jun",
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69 "Jul",
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70 "Aug",
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71 "Sep",
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72 "Oct",
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73 "Nov",
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74 "Dec"
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75 };
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76
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77 static char *log_levels[] = {
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78 "warning",
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79 "config",
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80 "security",
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81 "failure",
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82 "catastrophe",
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83 "info",
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84 "verbose"
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85 };
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86
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87 static int can_log[] = {
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88 1, // warning
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89 1, // config
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90 1, // security
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91 1, // failure
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92 1, // catastrophe
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93 1, // info
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94 0 // verbose
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95 };
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96
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97 int init_log_file(LogConfig *cfg) {
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98 if(is_initialized) {
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99 return 0;
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100 }
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101
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102 /* open the log file */
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103 mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
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104 log_file_fd = open(cfg->file, O_WRONLY | O_CREAT | O_APPEND, mode);
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105 if(log_file_fd == -1) {
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106 return -1;
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107 }
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108
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109 if(!strcmp(cfg->level, "ERROR")) {
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110 can_log[LOG_WARN] = 0;
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111 can_log[LOG_INFORM] = 0;
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112 } else if(!strcmp(cfg->level, "WARNING")) {
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113 can_log[LOG_INFORM] = 0;
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114 } else if(!strcmp(cfg->level, "INFO")) {
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115
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116 }
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117
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118 if(cfg->log_stdout) {
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119 // TODO
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120 }
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121 if(cfg->log_stderr) {
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122 // TODO
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123 }
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124
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125
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126 is_initialized = 1;
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127
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128 /* if ui_buffer is not NULL, write it to the log file */
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129 if(ui_buffer) {
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130 size_t len = ui_buffer->length;
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131 size_t r;
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132 while(len > 0) {
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133 r = write(log_file_fd, ui_buffer->ptr, ui_buffer->length);
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134 len -= r;
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135 }
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136
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137 sbuf_free(ui_buffer);
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138 }
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139
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140 return 0;
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141 }
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142
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143 void log_uninitialized_writeln(char *str, size_t len) {
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144 if(ui_buffer == NULL) {
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145 ui_buffer = sbuf_new(1024);
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146 if(ui_buffer == NULL) {
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147 return; /* TODO: critical error, exit */
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148 }
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149 }
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150
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151 sstr_t s;
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152 s.ptr = str;
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153 s.length = len;
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154
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155 sbuf_append(ui_buffer, s);
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156 sbuf_put(ui_buffer, '\n');
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157 }
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158
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159 void log_file_writeln(char *str, size_t len) {
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160 if(!is_initialized) {
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161 log_uninitialized_writeln(str, len);
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162 }
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163
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164 struct iovec io[] = {
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165 { str, len },
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166 { "\n", 1}
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167 };
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168
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169 writev(log_file_fd, io, 2); /* TODO: aio */
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170 }
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171
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172 sstr_t log_get_prefix(int level) {
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173 time_t t = time(NULL);
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174
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175 sstr_t d;
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176 d.ptr = NULL;
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177 d.length = 0;
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178
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179 struct tm date;
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180 localtime_r(&t, &date);
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181
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182 char *buf = malloc(64);
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183 int len = snprintf(
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184 buf,
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185 64,
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186 "[%02d/%s/%d:%02d:%02d:%02d] %s : ",
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187 date.tm_mday,
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188 log_date_month[date.tm_mon],
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189 1900 + date.tm_year,
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190 date.tm_hour,
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191 date.tm_min,
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192 date.tm_sec,
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193 log_levels[level]);
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194
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195 if(len > 0) {
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196 d.ptr = buf;
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197 d.length = len;
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198 }
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199
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200 return d;
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201 }
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202
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203
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204 /*
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205 * log api functions
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206 */
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207
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208 int log_ereport(int degree, const char *format, ...) {
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209 if(degree > 6) {
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210 return 0;
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211 }
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212 if(degree > 0 && !can_log[degree]) {
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213 return 0;
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214 }
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215
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216 sstr_t lmsg;
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217 lmsg.ptr = NULL;
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218 va_list ap;
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219 va_start(ap, format);
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220
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221 /* create log message prefix */
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222 sstr_t lpre = log_get_prefix(degree);
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223
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224 /* format message */
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225 int len = vasprintf(&lmsg.ptr, format, ap);
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226 lmsg.length = len;
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227
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228 /* create message string */
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229 sstr_t message;
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230 message.length = lpre.length + len;
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231 message.ptr = malloc(message.length + 1);
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232
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233 message = sstrncat(2, message, lpre, lmsg);
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234
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235 /* write message to the log file */
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236 log_file_writeln(message.ptr, message.length);
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237
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238 /* cleanup */
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239 free(lmsg.ptr);
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240 free(lpre.ptr);
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241 free(message.ptr);
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242
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243 return 0;
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244 }
45
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245
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246
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247 /*
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248 * access log
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249 * This source file only manages access log files. IO is performed directly
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250 * by AddLog safs.
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251 */
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252 LogFile* get_access_log_file(sstr_t file) {
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253 if(!access_log_files) {
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254 access_log_files = ucx_map_new(4);
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255 }
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256
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257 if(file.ptr == NULL || file.length == 0) {
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258 return NULL;
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259 }
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260
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261 LogFile *log = ucx_map_sstr_get(access_log_files, file);
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262 if(log != NULL) {
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263 ws_atomic_inc32(&log->ref);
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264 return log;
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265 }
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266
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267 // the log file is not opened
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268 // check first if we can open it
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269 FILE *out = fopen(file.ptr, "a");
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270 if(out == NULL) {
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271 return NULL;
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272 }
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273
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274 // create LogFile object
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275 log = calloc(1, sizeof(LogFile));
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276 log->file = out;
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277 log->ref = 1;
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278
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279 // add access log to the map
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280 ucx_map_sstr_put(access_log_files, file, log);
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281
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282 return log;
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283 }
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284

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