swanctl: Implement a --log command to trace debugging log

src/swanctl/Makefile.am

@@ -11,6 +11,7 @@ swanctl_SOURCES = \
 	commands/list_certs.c \
 	commands/load_conns.c \
 	commands/load_creds.c \
+	commands/log.c \
 	commands/version.c \
 	swanctl.c swanctl.h
 

src/swanctl/command.h

@@ -27,7 +27,7 @@
 /**
  * Maximum number of commands (+1).
  */
-#define MAX_COMMANDS 12
+#define MAX_COMMANDS 13
 
 /**
  * Maximum number of options in a command (+3)

src/swanctl/commands/log.c

@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2014 Martin Willi
+ * Copyright (C) 2014 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "command.h"
+
+#include <errno.h>
+#include <unistd.h>
+
+CALLBACK(log_cb, void,
+	bool *raw, char *name, vici_res_t *msg)
+{
+	if (*raw)
+	{
+		vici_dump(msg, "log", stdout);
+	}
+	else
+	{
+		char *current, *next;
+
+		current = vici_find_str(msg, NULL, "msg");
+		while (current)
+		{
+			next = strchr(current, '\n');
+			printf("%.2d[%s] ", vici_find_int(msg, 0, "thread"),
+				   vici_find_str(msg, "   ", "group"));
+			if (next == NULL)
+			{
+				printf("%s\n", current);
+				break;
+			}
+			printf("%.*s\n", (int)(next - current), current);
+			current = next + 1;
+		}
+	}
+}
+
+static int logcmd(vici_conn_t *conn)
+{
+	bool raw = FALSE;
+	char *arg;
+
+	while (TRUE)
+	{
+		switch (command_getopt(&arg))
+		{
+			case 'h':
+				return command_usage(NULL);
+			case 'r':
+				raw = TRUE;
+				continue;
+			case EOF:
+				break;
+			default:
+				return command_usage("invalid --log option");
+		}
+		break;
+	}
+
+	if (vici_register(conn, "log", log_cb, &raw) != 0)
+	{
+		fprintf(stderr, "registering for log failed: %s\n", strerror(errno));
+		return errno;
+	}
+	while (TRUE)
+	{
+		sleep(1);
+	}
+	return 0;
+}
+
+/**
+ * Register the command.
+ */
+static void __attribute__ ((constructor))reg()
+{
+	command_register((command_t) {
+		logcmd, 'T', "log", "trace logging output",
+		{"[--raw]"},
+		{
+			{"help",		'h', 0, "show usage information"},
+			{"raw",			'r', 0, "dump raw response message"},
+		}
+	});
+}