From: Loic Blot <loic.blot@unix-experience.fr>
Date: Wed, 1 Apr 2015 12:47:43 +0000 (+0200)
Subject: NetworkPacket: reading outside packet is now clearer.
X-Git-Tag: 0.4.13~399
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=113bdd3ec0608655d1ab36886b4708bb8ccb7870;p=oweals%2Fminetest.git

NetworkPacket: reading outside packet is now clearer.
Use a common function to check the reading offset
---

diff --git a/src/network/networkpacket.cpp b/src/network/networkpacket.cpp
index d7487af40..95605d410 100644
--- a/src/network/networkpacket.cpp
+++ b/src/network/networkpacket.cpp
@@ -39,6 +39,16 @@ NetworkPacket::~NetworkPacket()
 	m_data.clear();
 }
 
+void NetworkPacket::checkReadOffset(u32 from_offset)
+{
+	if (from_offset >= m_datasize) {
+		std::stringstream ss;
+		ss << "Reading outside packet (offset: " <<
+				from_offset << ", packet size: " << getSize() << ")";
+		throw SerializationError(ss.str());
+	}
+}
+
 void NetworkPacket::putRawPacket(u8 *data, u32 datasize, u16 peer_id)
 {
 	// If a m_command is already set, we are rewriting on same packet
@@ -55,8 +65,7 @@ void NetworkPacket::putRawPacket(u8 *data, u32 datasize, u16 peer_id)
 
 char* NetworkPacket::getString(u32 from_offset)
 {
-	if (from_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(from_offset);
 
 	return (char*)&m_data[from_offset];
 }
@@ -187,8 +196,7 @@ std::string NetworkPacket::readLongString()
 
 NetworkPacket& NetworkPacket::operator>>(char& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readU8(&m_data[m_read_offset]);
 
@@ -198,8 +206,7 @@ NetworkPacket& NetworkPacket::operator>>(char& dst)
 
 char NetworkPacket::getChar(u32 offset)
 {
-	if (offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(offset);
 
 	return readU8(&m_data[offset]);
 }
@@ -276,8 +283,7 @@ NetworkPacket& NetworkPacket::operator<<(float src)
 
 NetworkPacket& NetworkPacket::operator>>(bool& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readU8(&m_data[m_read_offset]);
 
@@ -287,8 +293,7 @@ NetworkPacket& NetworkPacket::operator>>(bool& dst)
 
 NetworkPacket& NetworkPacket::operator>>(u8& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readU8(&m_data[m_read_offset]);
 
@@ -298,8 +303,7 @@ NetworkPacket& NetworkPacket::operator>>(u8& dst)
 
 u8 NetworkPacket::getU8(u32 offset)
 {
-	if (offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(offset);
 
 	return readU8(&m_data[offset]);
 }
@@ -310,16 +314,14 @@ u8* NetworkPacket::getU8Ptr(u32 from_offset)
 		return NULL;
 	}
 
-	if (from_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(from_offset);
 
 	return (u8*)&m_data[from_offset];
 }
 
 NetworkPacket& NetworkPacket::operator>>(u16& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readU16(&m_data[m_read_offset]);
 
@@ -329,16 +331,14 @@ NetworkPacket& NetworkPacket::operator>>(u16& dst)
 
 u16 NetworkPacket::getU16(u32 from_offset)
 {
-	if (from_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(from_offset);
 
 	return readU16(&m_data[from_offset]);
 }
 
 NetworkPacket& NetworkPacket::operator>>(u32& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readU32(&m_data[m_read_offset]);
 
@@ -348,8 +348,7 @@ NetworkPacket& NetworkPacket::operator>>(u32& dst)
 
 NetworkPacket& NetworkPacket::operator>>(u64& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readU64(&m_data[m_read_offset]);
 
@@ -359,8 +358,7 @@ NetworkPacket& NetworkPacket::operator>>(u64& dst)
 
 NetworkPacket& NetworkPacket::operator>>(float& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readF1000(&m_data[m_read_offset]);
 
@@ -370,8 +368,7 @@ NetworkPacket& NetworkPacket::operator>>(float& dst)
 
 NetworkPacket& NetworkPacket::operator>>(v2f& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readV2F1000(&m_data[m_read_offset]);
 
@@ -381,8 +378,7 @@ NetworkPacket& NetworkPacket::operator>>(v2f& dst)
 
 NetworkPacket& NetworkPacket::operator>>(v3f& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readV3F1000(&m_data[m_read_offset]);
 
@@ -392,8 +388,7 @@ NetworkPacket& NetworkPacket::operator>>(v3f& dst)
 
 NetworkPacket& NetworkPacket::operator>>(s16& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readS16(&m_data[m_read_offset]);
 
@@ -409,8 +404,7 @@ NetworkPacket& NetworkPacket::operator<<(s16 src)
 
 NetworkPacket& NetworkPacket::operator>>(s32& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readS32(&m_data[m_read_offset]);
 
@@ -426,8 +420,7 @@ NetworkPacket& NetworkPacket::operator<<(s32 src)
 
 NetworkPacket& NetworkPacket::operator>>(v3s16& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readV3S16(&m_data[m_read_offset]);
 
@@ -445,8 +438,7 @@ NetworkPacket& NetworkPacket::operator>>(v2s32& dst)
 
 NetworkPacket& NetworkPacket::operator>>(v3s32& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readV3S32(&m_data[m_read_offset]);
 
@@ -494,8 +486,7 @@ NetworkPacket& NetworkPacket::operator<<(v3s32 src)
 
 NetworkPacket& NetworkPacket::operator>>(video::SColor& dst)
 {
-	if (m_read_offset >= m_datasize)
-		throw SerializationError("Malformed packet read");
+	checkReadOffset(m_read_offset);
 
 	dst = readARGB8(&m_data[m_read_offset]);
 
diff --git a/src/network/networkpacket.h b/src/network/networkpacket.h
index 0afb1e7e3..9ad169888 100644
--- a/src/network/networkpacket.h
+++ b/src/network/networkpacket.h
@@ -109,6 +109,8 @@ public:
 		// Temp, we remove SharedBuffer when migration finished
 		Buffer<u8> oldForgePacket();
 private:
+		void checkReadOffset(u32 from_offset);
+
 		template<typename T> void checkDataSize()
 		{
 			if (m_read_offset + sizeof(T) > m_datasize) {