From ee3c22ce55bdca3c4a96ffaeddb0f67c4e4ee6d3 Mon Sep 17 00:00:00 2001
From: "Dmitry V. Levin" <ldv@altlinux.org>
Date: Tue, 13 Mar 2012 15:28:01 +0000
Subject: [PATCH] Implement syslog syscall decoder

* linux/dummy.h (sys_syslog): Remove.
* linux/syscall.h (sys_syslog): New prototype.
* system.c (syslog_action_type): New xlat structure.
(sys_syslog): New function.
---
 linux/dummy.h   |  1 -
 linux/syscall.h |  1 +
 system.c        | 66 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 67 insertions(+), 1 deletion(-)

diff --git a/linux/dummy.h b/linux/dummy.h
index f22a8d32..08b5b109 100644
--- a/linux/dummy.h
+++ b/linux/dummy.h
@@ -47,7 +47,6 @@
 #define	sys_rt_tgsigqueueinfo	printargs
 #define	sys_sync_file_range	printargs
 #define	sys_sysfs		printargs
-#define	sys_syslog		printargs
 #define	sys_vm86old		printargs
 #define	sys_vm86		printargs
 
diff --git a/linux/syscall.h b/linux/syscall.h
index 18039703..b74c6c40 100644
--- a/linux/syscall.h
+++ b/linux/syscall.h
@@ -268,6 +268,7 @@ int sys_swapon();
 int sys_symlinkat();
 int sys_sysctl();
 int sys_sysinfo();
+int sys_syslog();
 int sys_tee();
 int sys_tgkill();
 int sys_time();
diff --git a/system.c b/system.c
index 61a614a7..54984494 100644
--- a/system.c
+++ b/system.c
@@ -214,6 +214,72 @@ sys_personality(struct tcb *tcp)
 	return 0;
 }
 
+enum {
+	SYSLOG_ACTION_CLOSE = 0,
+	SYSLOG_ACTION_OPEN,
+	SYSLOG_ACTION_READ,
+	SYSLOG_ACTION_READ_ALL,
+	SYSLOG_ACTION_READ_CLEAR,
+	SYSLOG_ACTION_CLEAR,
+	SYSLOG_ACTION_CONSOLE_OFF,
+	SYSLOG_ACTION_CONSOLE_ON,
+	SYSLOG_ACTION_CONSOLE_LEVEL,
+	SYSLOG_ACTION_SIZE_UNREAD,
+	SYSLOG_ACTION_SIZE_BUFFER
+};
+
+static const struct xlat syslog_action_type[] = {
+	{ SYSLOG_ACTION_CLOSE,		"SYSLOG_ACTION_CLOSE"		},
+	{ SYSLOG_ACTION_OPEN,		"SYSLOG_ACTION_OPEN"		},
+	{ SYSLOG_ACTION_READ,		"SYSLOG_ACTION_READ"		},
+	{ SYSLOG_ACTION_READ_ALL,	"SYSLOG_ACTION_READ_ALL"	},
+	{ SYSLOG_ACTION_READ_CLEAR,	"SYSLOG_ACTION_READ_CLEAR"	},
+	{ SYSLOG_ACTION_CLEAR,		"SYSLOG_ACTION_CLEAR"		},
+	{ SYSLOG_ACTION_CONSOLE_OFF,	"SYSLOG_ACTION_CONSOLE_OFF"	},
+	{ SYSLOG_ACTION_CONSOLE_ON,	"SYSLOG_ACTION_CONSOLE_ON"	},
+	{ SYSLOG_ACTION_CONSOLE_LEVEL,	"SYSLOG_ACTION_CONSOLE_LEVEL"	},
+	{ SYSLOG_ACTION_SIZE_UNREAD,	"SYSLOG_ACTION_SIZE_UNREAD"	},
+	{ SYSLOG_ACTION_SIZE_BUFFER,	"SYSLOG_ACTION_SIZE_BUFFER"	},
+	{ 0,				NULL				}
+};
+
+int
+sys_syslog(struct tcb *tcp)
+{
+	int type = tcp->u_arg[0];
+
+	if (entering(tcp)) {
+		/* type */
+		printxval(syslog_action_type, type, "SYSLOG_ACTION_???");
+		tprints(", ");
+	}
+
+	switch (type) {
+		case SYSLOG_ACTION_READ:
+		case SYSLOG_ACTION_READ_ALL:
+		case SYSLOG_ACTION_READ_CLEAR:
+			if (entering(tcp))
+				return 0;
+			break;
+		default:
+			if (entering(tcp)) {
+				tprintf("%#lx, %lu",
+					tcp->u_arg[1], tcp->u_arg[2]);
+			}
+			return 0;
+	}
+
+	/* bufp */
+	if (syserror(tcp))
+		tprintf("%#lx", tcp->u_arg[1]);
+	else
+		printstr(tcp, tcp->u_arg[1], tcp->u_rval);
+	/* len */
+	tprintf(", %d", (int) tcp->u_arg[2]);
+
+	return 0;
+}
+
 #include <linux/reboot.h>
 static const struct xlat bootflags1[] = {
 	{ LINUX_REBOOT_MAGIC1,	"LINUX_REBOOT_MAGIC1"	},
-- 
2.50.1