Allow logging to the syslog

TODO.txt

@@ -57,7 +57,7 @@ Phase 2: Building a foundation
 [x] Properly implement the command line options as stated in telodendria(8)
 [x] Remove "chroot" option, just chroot into the data dir, and make the log
     file live there as well.
-[~] Allow logging to the syslog
+[x] Allow logging to the syslog
 [ ] Fix bug where the socket stays open after quit.
 
 Phase 3: Welcome to Matrix

man/man5/telodendria.conf.5

@@ -1,4 +1,4 @@
-.Dd $Mdocdate: October 11 2022 $
+.Dd $Mdocdate: October 15 2022 $
 .Dt TELODENDRIA.CONF 5
 .Os Telodendria Project
 .Sh NAME
@@ -123,9 +123,16 @@ to run their own homeserver, you can aset this to
 which will allow anyone to create an account. Telodendria should be capable of handling
 a large amount of users without difficulty or security issues. This directive is
 required.
-.It Ic log Ar stdout|file
+.It Ic log Ar stdout|file|syslog
 The log configuration. Telodendria uses its own logging facility, which can output
-logs to standard output or a file. A number of child directives can
+logs to standard output, a file, or the syslog. If set to
+.Ar file ,
+Telodendria will log to
+.Pa telodendria.log
+inside the
+.Ic data-dir .
+.Pp
+A number of child directives can
 be added to this directive to customize the log output:
 .Bl -tag -width Ds
 .It Ic level Ar error|warning|task|message|debug
@@ -146,8 +153,7 @@ altogether, you can do so via this option. Acceptable values are
 .Ar default ,
 or a formatter string as described by your system's
 .Xr strftime 3 .
-In the future, logging to the syslog may also be an option. In that case, this
-option only applies if
+This option only applies if
 .Ic log
 is "stdout" or "file".
 .It Ic color Ar true|false

src/Log.c

@@ -36,7 +36,7 @@
 
 struct LogConfig
 {
-    LogLevel level;
+    int level;
     size_t indent;
     FILE *out;
     int flags;
@@ -133,7 +133,7 @@ LogConfigIndentSet(LogConfig * config, size_t indent)
     config->indent = indent;
 }
 
-LogLevel
+int
 LogConfigLevelGet(LogConfig * config)
 {
     if (!config)
@@ -145,7 +145,7 @@ LogConfigLevelGet(LogConfig * config)
 }
 
 void
-LogConfigLevelSet(LogConfig * config, LogLevel level)
+LogConfigLevelSet(LogConfig * config, int level)
 {
     if (!config)
     {
@@ -202,7 +202,7 @@ LogConfigUnindent(LogConfig * config)
 }
 
 void
-Log(LogConfig * config, LogLevel level, const char *msg,...)
+Log(LogConfig * config, int level, const char *msg,...)
 {
     size_t i;
     int doColor;
@@ -228,6 +228,16 @@ Log(LogConfig * config, LogLevel level, const char *msg,...)
 
     pthread_mutex_lock(&config->lock);
 
+    if (LogConfigFlagGet(config, LOG_FLAG_SYSLOG))
+    {
+        /* No further print logic is needed; syslog will handle it all
+         * for us. */
+        va_start(argp, msg);
+        vsyslog(level, msg, argp);
+        va_end(argp);
+        pthread_mutex_unlock(&config->lock);
+        return;
+    }
 
     doColor = LogConfigFlagGet(config, LOG_FLAG_COLOR)
             && isatty(fileno(config->out));
@@ -238,7 +248,10 @@ Log(LogConfig * config, LogLevel level, const char *msg,...)
 
         switch (level)
         {
-            case LOG_ERROR:
+            case LOG_EMERG:
+            case LOG_ALERT:
+            case LOG_CRIT:
+            case LOG_ERR:
                 /* Bold Red */
                 ansi = "\033[1;31m";
                 break;
@@ -246,11 +259,11 @@ Log(LogConfig * config, LogLevel level, const char *msg,...)
                 /* Bold Yellow */
                 ansi = "\033[1;33m";
                 break;
-            case LOG_TASK:
+            case LOG_NOTICE:
                 /* Bold Magenta */
                 ansi = "\033[1;35m";
                 break;
-            case LOG_MESSAGE:
+            case LOG_INFO:
                 /* Bold Green */
                 ansi = "\033[1;32m";
                 break;
@@ -289,6 +302,15 @@ Log(LogConfig * config, LogLevel level, const char *msg,...)
 
     switch (level)
     {
+        case LOG_EMERG:
+            indicator = '#';
+            break;
+        case LOG_ALERT:
+            indicator = '@';
+            break;
+        case LOG_CRIT:
+            indicator = 'X';
+            break;
         case LOG_ERROR:
             indicator = 'x';
             break;

src/Telodendria.c

@@ -311,9 +311,13 @@ main(int argc, char **argv)
     }
     else if (tConfig->flags & TELODENDRIA_LOG_SYSLOG)
     {
-        Log(lc, LOG_ERROR, "Logging to the syslog is not yet supported.");
-        exit = EXIT_FAILURE;
-        goto finish;
+        Log(lc, LOG_MESSAGE, "Logging to the syslog. Check there for all future messages.");
+        LogConfigFlagSet(lc, LOG_FLAG_SYSLOG);
+
+        openlog("telodendria", LOG_PID | LOG_NDELAY, LOG_DAEMON);
+        /* Always log everything, because the Log API will control what
+         * messages get passed to the syslog */
+        setlogmask(LOG_UPTO(LOG_DEBUG));
     }
     else
     {

src/include/Log.h

@@ -44,20 +44,19 @@
 
 #include <stdio.h>
 #include <stddef.h>
+#include <syslog.h>
 
 /*
- * There are five log "levels," each one showing more information than
- * the previous one. A level of LOG_ERROR shows only errors, while a
- * level of LOG_DEBUG shows all output possible.
+ * I used to define all my own constants, but now I use
+ * those defined in syslog.h. Instead of replacing all the
+ * references, I just map the old names to the new ones. If
+ * you're ever bored one day, you can remove these, and then
+ * go fix all the compiler errors that arise. Should be pretty
+ * easy, just mind numbing.
  */
-typedef enum LogLevel
-{
-    LOG_ERROR,
-    LOG_WARNING,
-    LOG_TASK,
-    LOG_MESSAGE,
-    LOG_DEBUG
-} LogLevel;
+#define LOG_ERROR LOG_ERR
+#define LOG_TASK LOG_NOTICE
+#define LOG_MESSAGE LOG_INFO
 
 /*
  * The possible flags that can be applied to alter the behavior of
@@ -65,7 +64,9 @@ typedef enum LogLevel
  */
 typedef enum LogFlag
 {
-    LOG_FLAG_COLOR = (1 << 0)      /* Enable color output on TTYs */
+    LOG_FLAG_COLOR = (1 << 0),     /* Enable color output on TTYs */
+    LOG_FLAG_SYSLOG = (1 << 1)     /* Log to the syslog instead of a
+                                    * file */
 } LogFlag;
 
 /*
@@ -110,10 +111,10 @@ extern void
  * Params:
  *
  *   (LogConfig *) The log configuration to set the log level on.
- *   (LogLevel)    The log level to set.
+ *   (int)    The log level to set.
  */
 extern void
- LogConfigLevelSet(LogConfig *, LogLevel);
+ LogConfigLevelSet(LogConfig *, int);
 
 /*
  * Indent the log output by two spaces. This can be helpful in
@@ -185,12 +186,12 @@ extern void
  * Params:
  *
  *   (LogConfig *)  The logging configuration.
- *   (LogLevel)     The level of the message to log.
+ *   (int)     The level of the message to log.
  *   (const char *) The format string, or a plain message string.
  *   (...)          Any items to map into the format string, printf()
  *                  style.
  */
 extern void
- Log(LogConfig *, LogLevel, const char *,...);
+ Log(LogConfig *, int, const char *,...);
 
 #endif

src/include/TelodendriaConfig.h

@@ -69,7 +69,7 @@ typedef struct TelodendriaConfig
     unsigned int maxConnections;
 
     char *logTimestamp;
-    LogLevel logLevel;
+    int logLevel;
 } TelodendriaConfig;
 
 /*