* flesh out design for wifi settings dialog

* move the pcap shit to a betterer place

src/frontend/qt_sdl/LAN_PCap.cpp

@@ -0,0 +1,387 @@
+/*
+    Copyright 2016-2020 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 "PlatformConfig.h"
+
+#ifdef __WIN32__
+	#include <iphlpapi.h>
+#else
+	#include <sys/types.h>
+	#include <ifaddrs.h>
+	#include <netinet/in.h>
+	#include <linux/if_packet.h>
+#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(bool open_adapter)
+{
+    // TODO: how to deal with cases where an adapter is unplugged or changes config??
+    if (!PCapLib)
+    {
+        PCapLib = NULL;
+
+        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;
+        }
+    }
+
+    PCapAdapter = NULL;
+    PacketLen = 0;
+    RXNum = 0;
+
+    NumAdapters = 0;
+
+    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;
+
+#ifdef __WIN32__
+        // hax
+        int len = strlen(dev->name);
+        len -= 12; if (len > 127) len = 127;
+        strncpy(adata->DeviceName, &dev->name[12], len);
+        adata->DeviceName[len] = '\0';
+#else
+        strncpy(adata->DeviceName, dev->name, 127);
+        adata->DeviceName[127] = '\0';
+
+        strncpy(adata->FriendlyName, adata->DeviceName, 127);
+        adata->FriendlyName[127] = '\0';
+#endif // __WIN32__
+
+        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", uret);
+        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, 4);
+                }
+
+                ipaddr = ipaddr->Next;
+            }
+
+            break;
+        }
+    }
+
+    HeapFree(GetProcessHeap(), 0, buf);
+
+#else
+
+    struct ifaddrs* addrs;
+    if (getifaddrs(&addrs) != 0)
+    {
+        printf("getifaddrs() shat itself :(\n");
+        return false;
+    }
+
+    for (int i = 0; i < NumAdapters; i++)
+    {
+        adata = &Adapters[i];
+        struct ifaddrs* curaddr = addrs;
+        while (curaddr)
+        {
+            if (strcmp(curaddr->ifa_name, adata->DeviceName))
+            {
+                curaddr = curaddr->ifa_next;
+                continue;
+            }
+
+            if (!curaddr->ifa_addr)
+            {
+                printf("Device (%s) does not have an address :/\n", curaddr->ifa_name);
+                curaddr = curaddr->ifa_next;
+                continue;
+            }
+
+            u16 af = curaddr->ifa_addr->sa_family;
+            if (af == AF_INET)
+            {
+                struct sockaddr_in* sa = (sockaddr_in*)curaddr->ifa_addr;
+                memcpy(adata->IP_v4, &sa->sin_addr, 4);
+            }
+            else if (af == AF_PACKET)
+            {
+                struct sockaddr_ll* sa = (sockaddr_ll*)curaddr->ifa_addr;
+                if (sa->sll_halen != 6)
+                    printf("weird MAC length %d for %s\n", sa->sll_halen, curaddr->ifa_name);
+                else
+                    memcpy(adata->MAC, sa->sll_addr, 6);
+            }
+
+            curaddr = curaddr->ifa_next;
+        }
+    }
+
+    freeifaddrs(addrs);
+
+#endif // __WIN32__
+
+    if (!open_adapter) return true;
+    if (PCapAdapter) pcap_close(PCapAdapter);
+
+    // 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 %s\n", errbuf);
+        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;
+}
+
+}

src/frontend/qt_sdl/LAN_PCap.h

@@ -0,0 +1,53 @@
+/*
+    Copyright 2016-2020 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/.
+*/
+
+#ifndef LAN_PCAP_H
+#define LAN_PCAP_H
+
+#include "../types.h"
+
+namespace LAN_PCap
+{
+
+typedef struct
+{
+    char DeviceName[128];
+    char FriendlyName[128];
+    char Description[128];
+
+    u8 MAC[6];
+    u8 IP_v4[4];
+
+    void* Internal;
+
+} AdapterData;
+
+
+extern AdapterData* Adapters;
+extern int NumAdapters;
+
+
+bool Init(bool open_adapter);
+void DeInit();
+
+int SendPacket(u8* data, int len);
+int RecvPacket(u8* data);
+
+}
+
+#endif // LAN_PCAP_H

src/frontend/qt_sdl/LAN_Socket.h

@@ -0,0 +1,38 @@
+/*
+    Copyright 2016-2020 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/.
+*/
+
+#ifndef LAN_SOCKET_H
+#define LAN_SOCKET_H
+
+#include "../types.h"
+
+namespace LAN_Socket
+{
+
+//
+
+
+bool Init();
+void DeInit();
+
+int SendPacket(u8* data, int len);
+int RecvPacket(u8* data);
+
+}
+
+#endif // LAN_SOCKET_H

src/frontend/qt_sdl/WifiSettingsDialog.ui

@@ -0,0 +1,165 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>WifiSettingsDialog</class>
+ <widget class="QDialog" name="WifiSettingsDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>479</width>
+    <height>217</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <property name="windowTitle">
+   <string>Wifi settings - melonDS</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="sizeConstraint">
+    <enum>QLayout::SetFixedSize</enum>
+   </property>
+   <item>
+    <widget class="QGroupBox" name="groupBox">
+     <property name="title">
+      <string>Local</string>
+     </property>
+     <layout class="QGridLayout" name="gridLayout">
+      <item row="0" column="0">
+       <widget class="QCheckBox" name="cbBindAnyAddr">
+        <property name="whatsThis">
+         <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Enabling this allows (theoretically) playing local multiplayer games over a local network. It may or may not help make for a better connection in general.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+        </property>
+        <property name="text">
+         <string>Bind socket to any address</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox_2">
+     <property name="title">
+      <string>Online</string>
+     </property>
+     <layout class="QGridLayout" name="gridLayout_2">
+      <item row="2" column="0">
+       <widget class="QLabel" name="label_2">
+        <property name="text">
+         <string>MAC address:</string>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="0" colspan="2">
+       <widget class="QCheckBox" name="cbDirectMode">
+        <property name="whatsThis">
+         <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Direct mode directly routes network traffic to the host network. It is the most reliable, but requires an ethernet connection.&lt;/p&gt;&lt;p&gt;&lt;br/&gt;&lt;/p&gt;&lt;p&gt;Non-direct mode uses a layer of emulation to get around this, but is more prone to problems.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+        </property>
+        <property name="text">
+         <string>Direct mode [TEXT PLACEHOLDER]</string>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="1">
+       <widget class="QComboBox" name="cbxDirectAdapter">
+        <property name="sizePolicy">
+         <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+          <horstretch>0</horstretch>
+          <verstretch>0</verstretch>
+         </sizepolicy>
+        </property>
+        <property name="minimumSize">
+         <size>
+          <width>350</width>
+          <height>0</height>
+         </size>
+        </property>
+        <property name="whatsThis">
+         <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Selects the network adapter through which to route network traffic under direct mode.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="0">
+       <widget class="QLabel" name="label">
+        <property name="text">
+         <string>Network adapter:</string>
+        </property>
+       </widget>
+      </item>
+      <item row="3" column="0">
+       <widget class="QLabel" name="label_3">
+        <property name="text">
+         <string>IP address:</string>
+        </property>
+       </widget>
+      </item>
+      <item row="2" column="1">
+       <widget class="QLabel" name="lblAdapterMAC">
+        <property name="text">
+         <string>[PLACEHOLDER]</string>
+        </property>
+       </widget>
+      </item>
+      <item row="3" column="1">
+       <widget class="QLabel" name="lblAdapterIP">
+        <property name="text">
+         <string>[PLACEHOLDER]</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>WifiSettingsDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>WifiSettingsDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>