GUAC-911: Add and document log level option for guacd.

src/guacd/conf-args.c

@@ -24,6 +24,7 @@
 
 #include "conf-args.h"
 #include "conf-file.h"
+#include "conf-parse.h"
 
 #include <getopt.h>
 #include <stdio.h>
@@ -34,7 +35,7 @@ int guacd_conf_parse_args(guacd_config* config, int argc, char** argv) {
 
     /* Parse arguments */
     int opt;
-    while ((opt = getopt(argc, argv, "l:b:p:C:K:f")) != -1) {
+    while ((opt = getopt(argc, argv, "l:b:p:L:C:K:f")) != -1) {
 
         /* -l: Bind port */
         if (opt == 'l') {
@@ -59,6 +60,20 @@ int guacd_conf_parse_args(guacd_config* config, int argc, char** argv) {
             config->pidfile = strdup(optarg);
         }
 
+        /* -L: Log level */
+        else if (opt == 'L') {
+
+            /* Validate and parse log level */
+            int level = guacd_parse_log_level(optarg);
+            if (level == -1) {
+                fprintf(stderr, "Invalid log level. Valid levels are: \"debug\", \"info\", \"warning\", and \"error\".\n");
+                return 1;
+            }
+
+            config->max_log_level = level;
+
+        }
+
 #ifdef ENABLE_SSL
         /* -C SSL certificate */
         else if (opt == 'C') {
@@ -88,6 +103,7 @@ int guacd_conf_parse_args(guacd_config* config, int argc, char** argv) {
                     " [-l LISTENPORT]"
                     " [-b LISTENADDRESS]"
                     " [-p PIDFILE]"
+                    " [-L LEVEL]"
 #ifdef ENABLE_SSL
                     " [-C CERTIFICATE_FILE]"
                     " [-K PEM_FILE]"

src/guacd/man/guacd.8

@@ -8,6 +8,7 @@ guacd \- Guacamole proxy daemon
 [\fB-b\fR \fIHOST\fR]
 [\fB-l\fR \fIPORT\fR]
 [\fB-p\fR \fIPID FILE\fR]
+[\fB-L\fR \fILOG LEVEL\fR]
 [\fB-C\fR \fICERTIFICATE FILE\fR]
 [\fB-K\fR \fIKEY FILE\fR]
 [\fB-f\fR]
@@ -42,6 +43,19 @@ to write the PID of the daemon process to the specified
 file. This is useful for init scripts and is used by the provided init
 script.
 .TP
+\fB\-L\fR \fILEVEL\fR
+Sets the maximum level at which
+.B guacd
+will log messages to syslog and, if running in the foreground, the console.
+Legal values are
+.B debug,
+.B info,
+.B warning,
+and
+.B error.
+The default value is
+.B info.
+.TP
 \fB\-f\fR
 Causes
 .B guacd