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3f82c7dcc1a85eba3326582246310636b930214c
melonDS/src/libui_sdl/LAN_PCap.cpp
Arisotura 3f82c7dcc1 make melonDS build again
2019-03-04 23:17:03 +01:00

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/*
Copyright 2016-2019 Arisotura
This file is part of melonDS.
melonDS 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 3 of the License, or (at your option)
any later version.
melonDS 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.
You should have received a copy of the GNU General Public License along
with melonDS. If not, see http://www.gnu.org/licenses/.
*/
// direct LAN interface. Currently powered by libpcap, may change.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <SDL2/SDL.h>
#include <pcap/pcap.h>
#include "Wifi.h"
#include "LAN_PCap.h"
#include "../Config.h"
#ifdef __WIN32__
#include <iphlpapi.h>
#else
// Linux includes go here
#endif
// welp
#ifndef PCAP_OPENFLAG_PROMISCUOUS
#define PCAP_OPENFLAG_PROMISCUOUS 1
#endif
#define DECL_PCAP_FUNC(ret, name, args, args2) \
typedef ret (*type_##name) args; \
type_##name ptr_##name = NULL; \
ret name args { return ptr_##name args2; }
DECL_PCAP_FUNC(int, pcap_findalldevs, (pcap_if_t** alldevs, char* errbuf), (alldevs,errbuf))
DECL_PCAP_FUNC(void, pcap_freealldevs, (pcap_if_t* alldevs), (alldevs))
DECL_PCAP_FUNC(pcap_t*, pcap_open_live, (const char* src, int snaplen, int flags, int readtimeout, char* errbuf), (src,snaplen,flags,readtimeout,errbuf))
DECL_PCAP_FUNC(void, pcap_close, (pcap_t* dev), (dev))
DECL_PCAP_FUNC(int, pcap_setnonblock, (pcap_t* dev, int nonblock, char* errbuf), (dev,nonblock,errbuf))
DECL_PCAP_FUNC(int, pcap_sendpacket, (pcap_t* dev, const u_char* data, int len), (dev,data,len))
DECL_PCAP_FUNC(int, pcap_dispatch, (pcap_t* dev, int num, pcap_handler callback, u_char* data), (dev,num,callback,data))
DECL_PCAP_FUNC(const u_char*, pcap_next, (pcap_t* dev, struct pcap_pkthdr* hdr), (dev,hdr))
namespace LAN_PCap
{
const char* PCapLibNames[] =
{
#ifdef __WIN32__
// TODO: name for npcap in non-WinPCap mode
"wpcap.dll",
#else
// Linux lib names
"libpcap.so.1",
"libpcap.so",
#endif
NULL
};
AdapterData* Adapters = NULL;
int NumAdapters = 0;
void* PCapLib = NULL;
pcap_t* PCapAdapter = NULL;
AdapterData* PCapAdapterData;
u8 PacketBuffer[2048];
int PacketLen;
volatile int RXNum;
#define LOAD_PCAP_FUNC(sym) \
ptr_##sym = (type_##sym)SDL_LoadFunction(lib, #sym); \
if (!ptr_##sym) return false;
bool TryLoadPCap(void* lib)
{
LOAD_PCAP_FUNC(pcap_findalldevs)
LOAD_PCAP_FUNC(pcap_freealldevs)
LOAD_PCAP_FUNC(pcap_open_live)
LOAD_PCAP_FUNC(pcap_close)
LOAD_PCAP_FUNC(pcap_setnonblock)
LOAD_PCAP_FUNC(pcap_sendpacket)
LOAD_PCAP_FUNC(pcap_dispatch)
LOAD_PCAP_FUNC(pcap_next)
return true;
}
bool Init()
{
// TODO: how to deal with cases where an adapter is unplugged or changes config??
if (PCapLib) return true;
PCapLib = NULL;
PCapAdapter = NULL;
PacketLen = 0;
RXNum = 0;
for (int i = 0; PCapLibNames[i]; i++)
{
void* lib = SDL_LoadObject(PCapLibNames[i]);
if (!lib) continue;
if (!TryLoadPCap(lib))
{
SDL_UnloadObject(lib);
continue;
}
printf("PCap: lib %s, init successful\n", PCapLibNames[i]);
PCapLib = lib;
break;
}
if (PCapLib == NULL)
{
printf("PCap: init failed\n");
return false;
}
char errbuf[PCAP_ERRBUF_SIZE];
int ret;
pcap_if_t* alldevs;
ret = pcap_findalldevs(&alldevs, errbuf);
if (ret < 0 || alldevs == NULL)
{
printf("PCap: no devices available\n");
return false;
}
pcap_if_t* dev = alldevs;
while (dev) { NumAdapters++; dev = dev->next; }
Adapters = new AdapterData[NumAdapters];
memset(Adapters, 0, sizeof(AdapterData)*NumAdapters);
AdapterData* adata = &Adapters[0];
dev = alldevs;
while (dev)
{
adata->Internal = dev;
// hax
int len = strlen(dev->name);
len -= 12; if (len > 127) len = 127;
strncpy(adata->DeviceName, &dev->name[12], len);
adata->DeviceName[len] = '\0';
dev = dev->next;
adata++;
}
#ifdef __WIN32__
ULONG bufsize = 16384;
IP_ADAPTER_ADDRESSES* buf = (IP_ADAPTER_ADDRESSES*)HeapAlloc(GetProcessHeap(), 0, bufsize);
ULONG uret = GetAdaptersAddresses(AF_INET, 0, NULL, buf, &bufsize);
if (uret == ERROR_BUFFER_OVERFLOW)
{
HeapFree(GetProcessHeap(), 0, buf);
buf = (IP_ADAPTER_ADDRESSES*)HeapAlloc(GetProcessHeap(), 0, bufsize);
uret = GetAdaptersAddresses(AF_INET, 0, NULL, buf, &bufsize);
}
if (uret != ERROR_SUCCESS)
{
printf("GetAdaptersAddresses() shat itself: %08X\n", ret);
return false;
}
for (int i = 0; i < NumAdapters; i++)
{
adata = &Adapters[i];
IP_ADAPTER_ADDRESSES* addr = buf;
while (addr)
{
if (strcmp(addr->AdapterName, adata->DeviceName))
{
addr = addr->Next;
continue;
}
WideCharToMultiByte(CP_UTF8, 0, addr->FriendlyName, 127, adata->FriendlyName, 127, NULL, NULL);
adata->FriendlyName[127] = '\0';
WideCharToMultiByte(CP_UTF8, 0, addr->Description, 127, adata->Description, 127, NULL, NULL);
adata->Description[127] = '\0';
if (addr->PhysicalAddressLength != 6)
{
printf("weird MAC addr length %d for %s\n", addr->PhysicalAddressLength, addr->AdapterName);
}
else
memcpy(adata->MAC, addr->PhysicalAddress, 6);
IP_ADAPTER_UNICAST_ADDRESS* ipaddr = addr->FirstUnicastAddress;
while (ipaddr)
{
SOCKADDR* sa = ipaddr->Address.lpSockaddr;
if (sa->sa_family == AF_INET)
{
struct in_addr sa4 = ((sockaddr_in*)sa)->sin_addr;
memcpy(adata->IP_v4, &sa4.S_un.S_addr, 4);
}
ipaddr = ipaddr->Next;
}
IP_ADAPTER_DNS_SERVER_ADDRESS* dnsaddr = addr->FirstDnsServerAddress;
int ndns = 0;
while (dnsaddr)
{
SOCKADDR* sa = dnsaddr->Address.lpSockaddr;
if (sa->sa_family == AF_INET)
{
struct in_addr sa4 = ((sockaddr_in*)sa)->sin_addr;
memcpy(adata->DNS[ndns++], &sa4.S_un.S_addr, 4);
}
if (ndns >= 8) break;
dnsaddr = dnsaddr->Next;
}
if (addr->Dhcpv4Enabled && addr->Dhcpv4Server.lpSockaddr)
{
SOCKADDR* sa = addr->Dhcpv4Server.lpSockaddr;
struct in_addr sa4 = ((sockaddr_in*)sa)->sin_addr;
memcpy(adata->DHCP_IP_v4, &sa4.S_un.S_addr, 4);
}
else
memset(adata->DHCP_IP_v4, 0, 4);
break;
}
}
HeapFree(GetProcessHeap(), 0, buf);
#else
// TODO
#endif // __WIN32__
// open pcap device
PCapAdapterData = &Adapters[0];
for (int i = 0; i < NumAdapters; i++)
{
if (!strncmp(Adapters[i].DeviceName, Config::LANDevice, 128))
PCapAdapterData = &Adapters[i];
}
dev = (pcap_if_t*)PCapAdapterData->Internal;
PCapAdapter = pcap_open_live(dev->name, 2048, PCAP_OPENFLAG_PROMISCUOUS, 1, errbuf);
if (!PCapAdapter)
{
printf("PCap: failed to open adapter\n");
return false;
}
pcap_freealldevs(alldevs);
if (pcap_setnonblock(PCapAdapter, 1, errbuf) < 0)
{
printf("PCap: failed to set nonblocking mode\n");
pcap_close(PCapAdapter); PCapAdapter = NULL;
return false;
}
return true;
}
void DeInit()
{
if (PCapLib)
{
if (PCapAdapter)
{
pcap_close(PCapAdapter);
PCapAdapter = NULL;
}
SDL_UnloadObject(PCapLib);
PCapLib = NULL;
}
}
void RXCallback(u_char* blarg, const struct pcap_pkthdr* header, const u_char* data)
{
while (RXNum > 0);
if (header->len > 2048-64) return;
PacketLen = header->len;
memcpy(PacketBuffer, data, PacketLen);
RXNum = 1;
}
int SendPacket(u8* data, int len)
{
if (PCapAdapter == NULL)
return 0;
if (len > 2048)
{
printf("LAN_SendPacket: error: packet too long (%d)\n", len);
return 0;
}
pcap_sendpacket(PCapAdapter, data, len);
// TODO: check success
return len;
}
int RecvPacket(u8* data)
{
if (PCapAdapter == NULL)
return 0;
int ret = 0;
if (RXNum > 0)
{
memcpy(data, PacketBuffer, PacketLen);
ret = PacketLen;
RXNum = 0;
}
pcap_dispatch(PCapAdapter, 1, RXCallback, NULL);
return ret;
}
}
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