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more fixes of misalignment

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orignal 2015-01-01 23:00:33 -05:00
parent fa4009821e
commit 29d1aa0146
7 changed files with 55 additions and 64 deletions
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60
I2NPProtocol.h
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@ -19,6 +19,11 @@ namespace i2p
const size_t I2NP_HEADER_SIZE_OFFSET = I2NP_HEADER_EXPIRATION_OFFSET + 8;
const size_t I2NP_HEADER_CHKS_OFFSET = I2NP_HEADER_SIZE_OFFSET + 2;
const size_t I2NP_HEADER_SIZE = I2NP_HEADER_CHKS_OFFSET + 1;
// I2NP short header
const size_t I2NP_SHORT_HEADER_TYPEID_OFFSET = 0;
const size_t I2NP_SHORT_HEADER_EXPIRATION_OFFSET = I2NP_SHORT_HEADER_TYPEID_OFFSET + 1;
const size_t I2NP_SHORT_HEADER_SIZE = I2NP_SHORT_HEADER_EXPIRATION_OFFSET + 4;
// Tunnel Gateway header
const size_t TUNNEL_GATEWAY_HEADER_TUNNELID_OFFSET = 0;
@ -27,21 +32,6 @@ namespace i2p
#pragma pack (1)
struct I2NPHeader
{
uint8_t typeID;
uint32_t msgID;
uint64_t expiration;
uint16_t size;
uint8_t chks;
};
struct I2NPHeaderShort
{
uint8_t typeID;
uint32_t shortExpiration;
};
struct I2NPDatabaseStoreMsg
{
uint8_t key[32];
@ -118,10 +108,10 @@ namespace tunnel
size_t len, offset, maxLen;
i2p::tunnel::InboundTunnel * from;
I2NPMessage (): buf (nullptr),len (sizeof (I2NPHeader) + 2),
I2NPMessage (): buf (nullptr),len (I2NP_HEADER_SIZE + 2),
offset(2), maxLen (0), from (nullptr) {};
// reserve 2 bytes for NTCP header
I2NPHeader * GetHeader () { return (I2NPHeader *)GetBuffer (); }; // depricated
// I2NPHeader * GetHeader () { return (I2NPHeader *)GetBuffer (); }; // depricated
// header accessors
uint8_t * GetHeaderBuffer () { return GetBuffer (); };
const uint8_t * GetHeaderBuffer () const { return GetBuffer (); };
@ -131,8 +121,10 @@ namespace tunnel
uint32_t GetMsgID () const { return bufbe32toh (GetHeaderBuffer () + I2NP_HEADER_MSGID_OFFSET); };
void SetExpiration (uint64_t expiration) { htobe64buf (GetHeaderBuffer () + I2NP_HEADER_EXPIRATION_OFFSET, expiration); };
uint64_t GetExpiration () const { return bufbe64toh (GetHeaderBuffer () + I2NP_HEADER_EXPIRATION_OFFSET); };
void SetSize (uint16_t size) { htobe16buf (GetHeaderBuffer () + I2NP_HEADER_SIZE_OFFSET, size); };
uint16_t GetSize () const { return bufbe16toh (GetHeaderBuffer () + I2NP_HEADER_SIZE_OFFSET); };
void UpdateSize () { htobe16buf (GetHeaderBuffer () + I2NP_HEADER_SIZE_OFFSET, GetPayloadLength ()); };
void UpdateSize () { SetSize (GetPayloadLength ()); };
void SetChks (uint8_t chks) { GetHeaderBuffer ()[I2NP_HEADER_CHKS_OFFSET] = chks; };
void UpdateChks ()
{
uint8_t hash[32];
@ -141,11 +133,11 @@ namespace tunnel
}
// payload
uint8_t * GetPayload () { return GetBuffer () + sizeof(I2NPHeader); };
uint8_t * GetPayload () { return GetBuffer () + I2NP_HEADER_SIZE; };
uint8_t * GetBuffer () { return buf + offset; };
const uint8_t * GetBuffer () const { return buf + offset; };
size_t GetLength () const { return len - offset; };
size_t GetPayloadLength () const { return GetLength () - sizeof(I2NPHeader); };
size_t GetPayloadLength () const { return GetLength () - I2NP_HEADER_SIZE; };
void Align (size_t alignment)
{
@ -166,25 +158,25 @@ namespace tunnel
}
// for SSU only
uint8_t * GetSSUHeader () { return buf + offset + sizeof(I2NPHeader) - sizeof(I2NPHeaderShort); };
uint8_t * GetSSUHeader () { return buf + offset + I2NP_HEADER_SIZE - I2NP_SHORT_HEADER_SIZE; };
void FromSSU (uint32_t msgID) // we have received SSU message and convert it to regular
{
I2NPHeaderShort ssu = *(I2NPHeaderShort *)GetSSUHeader ();
I2NPHeader * header = GetHeader ();
header->typeID = ssu.typeID;
header->msgID = htobe32 (msgID);
header->expiration = htobe64 (be32toh (ssu.shortExpiration)*1000LL);
header->size = htobe16 (len - offset - sizeof (I2NPHeader));
header->chks = 0;
const uint8_t * ssu = GetSSUHeader ();
GetHeaderBuffer ()[I2NP_HEADER_TYPEID_OFFSET] = ssu[I2NP_SHORT_HEADER_TYPEID_OFFSET]; // typeid
SetMsgID (msgID);
SetExpiration (bufbe32toh (ssu + I2NP_SHORT_HEADER_EXPIRATION_OFFSET)*1000LL);
SetSize (len - offset - I2NP_HEADER_SIZE);
SetChks (0);
}
uint32_t ToSSU () // return msgID
{
I2NPHeader header = *GetHeader ();
I2NPHeaderShort * ssu = (I2NPHeaderShort *)GetSSUHeader ();
ssu->typeID = header.typeID;
ssu->shortExpiration = htobe32 (be64toh (header.expiration)/1000LL);
len = offset + sizeof (I2NPHeaderShort) + be16toh (header.size);
return be32toh (header.msgID);
uint8_t header[I2NP_HEADER_SIZE];
memcpy (header, GetHeaderBuffer (), I2NP_HEADER_SIZE);
uint8_t * ssu = GetSSUHeader ();
ssu[I2NP_SHORT_HEADER_TYPEID_OFFSET] = header[I2NP_HEADER_TYPEID_OFFSET]; // typeid
htobe32buf (ssu + I2NP_SHORT_HEADER_EXPIRATION_OFFSET, bufbe64toh (header + I2NP_HEADER_EXPIRATION_OFFSET)/1000LL);
len = offset + I2NP_SHORT_HEADER_SIZE + bufbe16toh (header + I2NP_HEADER_SIZE_OFFSET);
return bufbe32toh (header + I2NP_HEADER_MSGID_OFFSET);
}
};