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189935b1 | 1 | Old versions of ircu did not have very good means of dealing with |
2 | logging. In u2.10.11, an entirely new logging subsystem was written, | |
3 | allowing a server administrator much more power in determining what | |
4 | actions are to be logged where. The new logging subsystem permits log | |
5 | messages to go to syslog, to a file, and to server operators via | |
6 | server notices, simultaneously (though having output to multiple log | |
7 | files is not presently supported). | |
8 | ||
9 | All log messages have two values that are passed in with them: the | |
10 | logging level, which must be one of the values in enum LogLevel, and a | |
11 | logging subsystem, which must be one of the values in enum LogSys; | |
12 | these values are used as indexes into arrays within ircd_log.c, so be | |
13 | careful should you change them. | |
14 | ||
15 | In addition to the LogLevel and LogSys, there is also a set of three | |
16 | flags that may be passed to the log_write() logging function; these | |
17 | flags may be used to suppress certain types of logging that may be | |
18 | undesirable. For instance, when a server links, a log may be written | |
19 | containing the server's IP address; to prevent this IP address from | |
20 | ever showing up in a server notice, that invocation of log_write() is | |
21 | passed the LOG_NOSNOTICE flag. | |
22 | ||
23 | <enum> | |
24 | enum LogLevel { | |
25 | L_CRIT, | |
26 | L_ERROR, | |
27 | L_WARNING, | |
28 | L_NOTICE, | |
29 | L_TRACE, | |
30 | L_INFO, | |
31 | L_DEBUG, | |
32 | L_LAST_LEVEL | |
33 | }; | |
34 | ||
35 | This enum describes the severity levels of a log message. The | |
36 | severity decreases as you proceed downwards in the list, so L_DEBUG is | |
37 | less severe than L_INFO, and L_CRIT in the most severe of all. The | |
38 | special value L_LAST_LEVEL should never be used; it merely marks the | |
39 | end of the list. | |
40 | </enum> | |
41 | ||
42 | <enum> | |
43 | enum LogSys { | |
44 | LS_SYSTEM, LS_CONFIG, LS_OPERMODE, LS_GLINE, LS_JUPE, LS_WHO, LS_NETWORK, | |
45 | LS_OPERKILL, LS_SERVKILL, LS_USER, LS_OPER, LS_RESOLVER, LS_SOCKET, | |
46 | LS_DEBUG, LS_OLDLOG, | |
47 | LS_LAST_SYSTEM | |
48 | }; | |
49 | ||
50 | These are the various logging subsystems recognized by the logging | |
51 | subsystem. Again, order is important, and again, LS_LAST_SYSTEM | |
52 | should never be used. | |
53 | </enum> | |
54 | ||
55 | <function> | |
56 | void log_debug_init(int usetty); | |
57 | ||
58 | This initializes the special-purpose debug logging code in the | |
59 | server. If the _usetty_ parameter is non-zero, then all debugging | |
60 | output will go to the terminal regardless of file settings for the | |
61 | LS_DEBUG subsystem. This function is not defined unless the server is | |
62 | compiled with -DDEBUGMODE. | |
63 | </function> | |
64 | ||
65 | <function> | |
66 | void log_init(const char *process_name); | |
67 | ||
68 | This initializes the entire logging subsystem, including special | |
69 | things such as storing the process name and opening syslog with the | |
70 | open_log() function. It may only be called once. | |
71 | </function> | |
72 | ||
73 | <function> | |
74 | void log_reopen(void); | |
75 | ||
76 | All log files are persistently open, in order to avoid the overhead of | |
77 | re-opening the log file each time. This function is used to close all | |
78 | the log files and to close and reopen syslog. (Log files are opened | |
79 | again only when there is something to write to them.) | |
80 | </function> | |
81 | ||
82 | <function> | |
83 | void log_close(void); | |
84 | ||
85 | This closes all log files and the syslog prior to the server | |
86 | terminating. Should logs need to be reopened after calling this | |
87 | function, call log_reopen() instead of log_init(). | |
88 | </function> | |
89 | ||
90 | <function> | |
91 | void log_write(enum LogSys subsys, enum LogLevel severity, | |
92 | unsigned int flags, const char *fmt, ...); | |
93 | ||
94 | This is the actual logging function. The _flags_ parameter is 0 or | |
95 | the bitwise OR of LOG_NOSYSLOG (suppresses syslogging), LOG_NOFILELOG | |
96 | (suppresses logging to a file) and LOG_NOSNOTICE (suppresses logging | |
97 | via server notices). The _fmt_ parameter is a format string | |
98 | acceptable to ircd_snprintf(), which is the function called to | |
99 | actually format the log message. | |
100 | </function> | |
101 | ||
102 | <function> | |
103 | void log_vwrite(enum LogSys subsys, enum LogLevel severity, | |
104 | unsigned int flags, const char *fmt, va_list vl); | |
105 | ||
106 | This is similar to log_write() except that it takes a va_list | |
107 | parameter. | |
108 | </function> | |
109 | ||
110 | <function> | |
111 | char *log_cannon(const char *subsys); | |
112 | ||
113 | This returns the canonical name for logging subsystem. This probably | |
114 | should not be exposed here, but it is needed in ircd_features.c at | |
115 | present. | |
116 | </function> | |
117 | ||
118 | <function> | |
119 | int log_set_file(const char *subsys, const char *filename); | |
120 | ||
121 | This sets the file name for the specified logging subsystem to | |
122 | _filename_; returns 2 if the subsystem was undefined, 1 if the value | |
123 | of _filename_ was not understood, or 0 if there was no error. | |
124 | </function> | |
125 | ||
126 | <function> | |
127 | char *log_get_file(const char *subsys); | |
128 | ||
129 | This returns the current log file name for the given subsystem. | |
130 | </function> | |
131 | ||
132 | <function> | |
133 | int log_set_facility(const char *subsys, const char *facility); | |
134 | ||
135 | This sets the syslog facility for the specified logging subsystem to | |
136 | _facility_; returns 2 if the subsystem was undefined, 1 if the value | |
137 | of _facility_ was not understood, or 0 if there was no error. Two | |
138 | special facility names may be given; "NONE" specifies that no | |
139 | syslogging should be performed, and "DEFAULT" specifies that ircd's | |
140 | default syslog facility should be used. | |
141 | </function> | |
142 | ||
143 | <function> | |
144 | char *log_get_facility(const char *subsys); | |
145 | ||
146 | This returns the current syslog facility for the given subsystem. See | |
147 | the documentation for log_set_facility() for a description of the | |
148 | special facility names "NONE" and "DEFAULT." | |
149 | </function> | |
150 | ||
151 | <function> | |
152 | int log_set_snomask(const char *subsys, const char *snomask); | |
153 | ||
154 | This sets the server notice type for the specified logging subsystem | |
155 | to _snomask_; returns 2 if the subsystem was undefined, 1 if the value | |
156 | of _snomask_ was not understood, or 0 if there was no error. The | |
157 | special server notice type "NONE" indicates that no server notices | |
158 | should be generated. The other valid values for _snomask_ are: | |
159 | "OLDSNO," "SERVKILL," "OPERKILL," "HACK2," "HACK3," "UNAUTH," | |
160 | "TCPCOMMON," "TOOMANY," "HACK4," "GLINE," "NETWORK," "IPMISMATCH," | |
161 | "THROTTLE," "OLDREALOP," "CONNEXIT," and "DEBUG." | |
162 | </function> | |
163 | ||
164 | <function> | |
165 | char *log_get_snomask(const char *subsys); | |
166 | ||
167 | This returns the current server notice type for the given subsystem. | |
168 | See the documentation for log_set_snomask() for a description of the | |
169 | return values. | |
170 | </function> | |
171 | ||
172 | <function> | |
173 | int log_set_level(const char *subsys, const char *level); | |
174 | ||
175 | This function is used to set the minimum log level for a particular | |
176 | subsystem; returns 2 if the subsystem was undefined, 1 if the value of | |
177 | _level_ was not understood, or 0 if there was no error. Any log | |
178 | notices generated with lower severity than that set with this function | |
179 | will not be logged. Valid values are "CRIT," "ERROR," "WARNING," | |
180 | "NOTICE," "TRACE," "INFO," and "DEBUG." | |
181 | </function> | |
182 | ||
183 | <function> | |
184 | char *log_get_level(const char *subsys); | |
185 | ||
186 | This returns the current minimum log level for the given subsystem. | |
187 | See the documentation for log_set_level() for a description of the | |
188 | return values. | |
189 | </function> | |
190 | ||
191 | <function> | |
192 | int log_set_default(const char *facility); | |
193 | ||
194 | This function sets the default syslog facility for all of ircd. Valid | |
195 | values for _facility_ are as described for log_set_facility() with the | |
196 | exclusion of the "NONE" and "DEFAULT" facilities; returns 1 if the | |
197 | facility name was unrecognized (or proscribed) or 0 if there was no | |
198 | error. | |
199 | </function> | |
200 | ||
201 | <function> | |
202 | char *log_get_default(void); | |
203 | ||
204 | This simply returns ircd's default syslog facility. | |
205 | </function> | |
206 | ||
207 | <function> | |
208 | void log_feature_unmark(void); | |
209 | ||
210 | This function is called by the ircd_features.c subsystem and should | |
211 | not be called by any other part of ircd. See the features API | |
212 | documentation for notes on what this function does. | |
213 | </function> | |
214 | ||
215 | <function> | |
216 | void log_feature_mark(int flag); | |
217 | ||
218 | This function is called by the ircd_features.c subsystem and should | |
219 | not be called by any other part of ircd. See the features API | |
220 | documentation for notes on what this function does. | |
221 | </function> | |
222 | ||
223 | <function> | |
224 | void log_feature_report(struct Client *to, int flag); | |
225 | ||
226 | This function is called by the ircd_features.c subsystem and should | |
227 | not be called by any other part of ircd. See the features API | |
228 | documentation for notes on what this function does. | |
229 | </function> | |
230 | ||
231 | <authors> | |
232 | Kev <klmitch@mit.edu> | |
233 | </authors> | |
234 | ||
235 | <changelog> | |
236 | [2001-06-13 Kev] Fix a minor typo. | |
237 | ||
238 | [2000-12-18 Kev] Wrote some documentation on how to use the logging | |
239 | subsystem. | |
240 | </changelog> |