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* begin work on actual socket shito 

* move UDP-frame finishing to separate function
This commit is contained in:
Arisotura 2019-03-05 14:06:24 +01:00
parent 950170df6d
commit 623b0ea2e0
1 changed files with 58 additions and 60 deletions
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118
src/libui_sdl/LAN_Socket.cpp
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@ -78,6 +78,8 @@ typedef struct
// 1: connected
u8 Status;
SOCKET Backend;
} TCPSocket;
TCPSocket TCPSocketList[16];
@ -104,6 +106,45 @@ void DeInit()
//
}
void FinishUDPFrame(u8* data, int len)
{
u8* ipheader = &data[0xE];
u8* udpheader = &data[0x22];
// lengths
*(u16*)&ipheader[2] = htons(len - 0xE);
*(u16*)&udpheader[4] = htons(len - (0xE + 0x14));
// IP checksum
u32 tmp = 0;
for (int i = 0; i < 20; i += 2)
tmp += ntohs(*(u16*)&ipheader[i]);
while (tmp >> 16)
tmp = (tmp & 0xFFFF) + (tmp >> 16);
tmp ^= 0xFFFF;
*(u16*)&ipheader[10] = htons(tmp);
// UDP checksum
// (note: normally not mandatory, but some older sgIP versions require it)
tmp = 0;
tmp += ntohs(*(u16*)&ipheader[12]);
tmp += ntohs(*(u16*)&ipheader[14]);
tmp += ntohs(*(u16*)&ipheader[16]);
tmp += ntohs(*(u16*)&ipheader[18]);
tmp += ntohs(0x1100);
tmp += (len-0x22);
for (u8* i = udpheader; i < &udpheader[len-0x22]; i += 2)
tmp += ntohs(*(u16*)i);
while (tmp >> 16)
tmp = (tmp & 0xFFFF) + (tmp >> 16);
tmp ^= 0xFFFF;
if (tmp == 0) tmp = 0xFFFF;
*(u16*)&udpheader[6] = htons(tmp);
}
/*bool HandleIncomingIPFrame(u8* data, int len)
{
const u32 serverip = 0x0A404001;
@ -331,38 +372,9 @@ void HandleDHCPFrame(u8* data, int len)
*out++ = 0xFF;
memset(out, 0, 20); out += 20;
// lengths
u32 framelen = (u32)(out - &resp[0]);
if (framelen & 1) { *out++ = 0; framelen++; }
*(u16*)&ipheader[2] = htons(framelen - 0xE);
*(u16*)&udpheader[4] = htons(framelen - (0xE + 0x14));
// IP checksum
u32 tmp = 0;
for (int i = 0; i < 20; i += 2)
tmp += ntohs(*(u16*)&ipheader[i]);
while (tmp >> 16)
tmp = (tmp & 0xFFFF) + (tmp >> 16);
tmp ^= 0xFFFF;
*(u16*)&ipheader[10] = htons(tmp);
// UDP checksum
// (note: normally not mandatory, but some older sgIP versions require it)
tmp = 0;
tmp += ntohs(*(u16*)&ipheader[12]);
tmp += ntohs(*(u16*)&ipheader[14]);
tmp += ntohs(*(u16*)&ipheader[16]);
tmp += ntohs(*(u16*)&ipheader[18]);
tmp += ntohs(0x1100);
tmp += (u32)(out - udpheader);
for (u8* i = udpheader; i < out; i += 2)
tmp += ntohs(*(u16*)i);
while (tmp >> 16)
tmp = (tmp & 0xFFFF) + (tmp >> 16);
tmp ^= 0xFFFF;
if (tmp == 0) tmp = 0xFFFF;
*(u16*)&udpheader[6] = htons(tmp);
FinishUDPFrame(resp, framelen);
// TODO: if there is already a packet queued, this will overwrite it
// that being said, this will only happen during DHCP setup, so probably
@ -521,38 +533,9 @@ void HandleDNSFrame(u8* data, int len)
*(u32*)out = addr_res; out += 4; // address
}
// lengths
u32 framelen = (u32)(out - &resp[0]);
if (framelen & 1) { *out++ = 0; framelen++; }
*(u16*)&resp_ipheader[2] = htons(framelen - 0xE);
*(u16*)&resp_udpheader[4] = htons(framelen - (0xE + 0x14));
// IP checksum
u32 tmp = 0;
for (int i = 0; i < 20; i += 2)
tmp += ntohs(*(u16*)&resp_ipheader[i]);
while (tmp >> 16)
tmp = (tmp & 0xFFFF) + (tmp >> 16);
tmp ^= 0xFFFF;
*(u16*)&resp_ipheader[10] = htons(tmp);
// UDP checksum
// (note: normally not mandatory, but some older sgIP versions require it)
tmp = 0;
tmp += ntohs(*(u16*)&resp_ipheader[12]);
tmp += ntohs(*(u16*)&resp_ipheader[14]);
tmp += ntohs(*(u16*)&resp_ipheader[16]);
tmp += ntohs(*(u16*)&resp_ipheader[18]);
tmp += ntohs(0x1100);
tmp += (u32)(out - resp_udpheader);
for (u8* i = resp_udpheader; i < out; i += 2)
tmp += ntohs(*(u16*)i);
while (tmp >> 16)
tmp = (tmp & 0xFFFF) + (tmp >> 16);
tmp ^= 0xFFFF;
if (tmp == 0) tmp = 0xFFFF;
*(u16*)&resp_udpheader[6] = htons(tmp);
FinishUDPFrame(resp, framelen);
// TODO: if there is already a packet queued, this will overwrite it
// that being said, this will only happen during DHCP setup, so probably
@ -668,6 +651,21 @@ void HandleIPFrame(u8* data, int len)
sock->Status = 1;
memcpy(sock->DestIP, &ipheader[16], 4);
sock->DestPort = dstport;
// open backend socket
if (!sock->Backend)
{
sock->Backend = socket(AF_INET, SOCK_STREAM, 0);
}
struct sockaddr_in conn_addr;
memset(&conn_addr, 0, sizeof(conn_addr));
conn_addr.sin_family = AF_INET;
conn_addr.sin_addr.S_un.S_addr = *(u32*)&ipheader[16];
if (connect(sock->Backend, (sockaddr*)&conn_addr, sizeof(conn_addr)) == SOCKET_ERROR)
{
printf("connect() shat itself :(\n");
}
}
else
{