Most stuff should work

Makefile

@@ -0,0 +1,20 @@
+CXX		  := g++
+CXX_FLAGS := -Wall -Wextra -std=c++17
+
+BIN		:= bin
+SRC		:= src
+INCLUDE	:= include
+
+EXECUTABLE	:= passthrough
+
+all: $(EXECUTABLE)
+
+run: clean all
+	clear
+	./$(EXECUTABLE)
+
+$(EXECUTABLE): $(SRC)/*.cpp
+	$(CXX) $(CXX_FLAGS) -I$(INCLUDE) $^ -o $@
+
+clean:
+	-rm passthrough

README.md

@@ -1,5 +1,9 @@
 ## Automated Setup
-#### ** TODO : NOT SURE **
+#### Install required tools
+```sh
+sudo pacman -S qemu libvirt edk2-ovmf virt-manager dnsmasq ebtables iptables
+```
+
 
 ## Manual Setup
 <b>Note</b>: Replace win10 with your virtual machine's name on libvirt hooks and virsh commands.

include/iommu.h

@@ -0,0 +1,11 @@
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <memory>
+#include <sysinfo.h>
+#include <shell.h>
+
+void check_vt_support();
+bool check_iommu();
+void enable_iommu();
+void configure_iommu();

include/libvirt.h

@@ -0,0 +1,44 @@
+#include <sys/stat.h>
+#include <iostream>
+#include <fstream>
+#include <bits/stdc++.h>
+#include <sysinfo.h>
+
+void libvirt_hook();
+void hook_begin();
+void hook_release();
+std::string begin_script();
+std::string end_script();
+
+inline const char *hooks_path = "/etc/libvirt/hooks";
+inline const char *qemu_hook = "/etc/libvirt/hooks/qemu";
+inline const char *vm_path = "/etc/libvirt/hooks/qemu.d/win10";
+
+inline const char *vm_prepare = "/etc/libvirt/hooks/qemu.d/win10/prepare";
+inline const char *vm_begin = "/etc/libvirt/hooks/qemu.d/win10/prepare/begin";
+inline const char *begin_sh = "/etc/libvirt/hooks/qemu.d/win10/prepare/begin/begin.sh";
+
+inline const char *vm_release = "/etc/libvirt/hooks/qemu.d/win10/release";
+inline const char *vm_end = "/etc/libvirt/hooks/qemu.d/win10/release/end";
+inline const char *end_sh = "/etc/libvirt/hooks/qemu.d/win10/release/end/end.sh";
+
+inline const std::string qemu_script = R"#(#!/bin/bash
+
+GUEST_NAME="$1"
+HOOK_NAME="$2"
+STATE_NAME="$3"
+MISC="${@:4}"
+
+BASEDIR="$(dirname $0)"
+
+HOOKPATH="$BASEDIR/qemu.d/$GUEST_NAME/$HOOK_NAME/$STATE_NAME"
+set -e # If a script exits with an error, we should as well.
+
+if [ -f "$HOOKPATH" ]; then
+  eval \""$HOOKPATH"\" "$@"
+elif [ -d "$HOOKPATH" ]; then
+  while read file; do
+    eval \""$file"\" "$@"
+  done <<< "$(find -L "$HOOKPATH" -maxdepth 1 -type f -executable -print;)"
+fi
+)#";

include/shell.h

@@ -0,0 +1,4 @@
+#include <memory>
+#include <iostream>
+
+std::string shell_cmd(char const *cmd);

include/sysinfo.h

@@ -0,0 +1,9 @@
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <shell.h>
+
+std::string get_cpu_vendor();
+std::string get_gpu_vendor();
+std::string get_vga_slot();
+std::string get_audio_slot();

include/tools.h

@@ -0,0 +1,10 @@
+#include <iostream>
+#include <fstream>
+#include <sys/stat.h>
+#include <memory>
+#include <shell.h>
+
+void install_tools();
+void enable_services();
+void user_mod();
+std::string get_init();

src/iommu.cpp

@@ -0,0 +1,83 @@
+#include <iommu.h>
+
+void configure_iommu()
+{
+    check_vt_support();
+    enable_iommu();
+}
+
+void check_vt_support()
+{
+    std::cout << "\033[1;36mChecking system for virtualisation support \033[0m";
+    std::string res = shell_cmd("lscpu | grep Virtualization");
+
+    if (res.empty())
+        throw std::runtime_error("\n\033[1;31mVirtualisation is not enabled on your system!\033[0m");
+    std::cout << "\033[1;32m\u2714\033[0m" << std::endl;
+}
+
+bool check_iommu()
+{
+    std::cout << "\033[1;36mIs IOMMU enabled? \033[0m";
+    std::string res = shell_cmd("(dmesg | grep 'IOMMU enabled') 2>&1");
+
+    if (res.find("IOMMU enabled") != std::string::npos)
+        std::cout << "\033[1;32m\u2714\033[0m" << std::endl;
+    else
+    {
+        std::cout << "\033[1;31m\u2718\033[0m" << std::endl;
+        return false;
+    }
+    return true;
+}
+
+void enable_iommu()
+{
+    if (!check_iommu())
+    {
+        std::ifstream ifs("/etc/default/grub");
+        std::ofstream ofs("./tmp/grub");
+
+        if (ifs.fail())
+            throw std::runtime_error("\033[1;31mGrubloader doesn't exist or I can't find it on your system.\033[0m");
+        if (ofs.fail())
+            throw std::runtime_error("\033[1;31mFailed to create temporary file.\033[0m");
+
+        std::string line;
+        while (getline(ifs, line))
+        {
+            std::istringstream iss(line);
+            std::string key;
+            if (std::getline(iss, key, '=') && key.rfind("#", 0) != 0)
+            {
+                std::string value;
+                std::getline(iss, value);
+                if (key == "GRUB_CMDLINE_LINUX_DEFAULT")
+                {
+                    if (get_cpu_vendor() == "intel")
+                    {
+                        if (value.find("intel_iommu=on") == std::string::npos)
+                            value.insert(*value.cbegin(), " intel_iommu=on");
+                    }
+                    else if (value.find("amd_iommu=on") == std::string::npos)
+                        value.insert(*value.cbegin(), " amd_iommu=on");
+                    if (value.find("iommu=pt") == std::string::npos)
+                        value.insert(*value.cbegin(), " iommu=pt");
+                }
+                ofs << key << "=" << value << '\n';
+            }
+            else
+                ofs << line << '\n';
+        }
+        ifs.close();
+        ofs.close();
+
+        std::string res = shell_cmd("(mv -f ./tmp/grub /etc/default/grub) 2>&1");
+        system("grub-mkconfig -o /boot/grub/grub.cfg");
+
+        if (res.empty())
+            throw std::runtime_error("\033[1;32mIOMMU enabled. Please reboot your system to continue.\033[0m");
+        else
+            throw std::runtime_error("\033[1;31mFailed to enable IOMMU.\n" + res + "\033[0m");
+    }
+}

src/libvirt.cpp

@@ -0,0 +1,71 @@
+#include <libvirt.h>
+
+void libvirt_hook()
+{
+    struct stat buf;
+    if (stat(hooks_path, &buf) != 0)
+        if (mkdir(hooks_path, 0755) == -1)
+            throw std::runtime_error(strerror(errno));
+    if (stat(qemu_hook, &buf) != 0)
+    {
+        std::ofstream file(qemu_hook);
+        file << qemu_script;
+        file.close();
+        if (chmod(qemu_hook, 0755) == -1)
+            throw std::runtime_error(strerror(errno));
+    }
+}
+
+void hook_begin()
+{
+    struct stat buf;
+    if (stat(vm_path, &buf) != 0)
+        if (mkdir(vm_path, 0755) == -1)
+            throw std::runtime_error(strerror(errno));
+    if (stat(vm_prepare, &buf) != 0)
+        if (mkdir(vm_prepare, 0755) == -1)
+            throw std::runtime_error(strerror(errno));
+    if (stat(vm_begin, &buf) != 0)
+        if (mkdir(vm_begin, 0755) == -1)
+            throw std::runtime_error(strerror(errno));
+    if (stat(begin_sh, &buf) != 0)
+    {
+        std::ofstream file(begin_sh);
+        file << "#BEGIN";
+        file.close();
+        if (chmod(begin_sh, 0755) == -1)
+            throw std::runtime_error(strerror(errno));
+    }
+}
+
+void hook_release()
+{
+    struct stat buf;
+    if (stat(vm_path, &buf) != 0)
+        if (mkdir(vm_path, 0755) == -1)
+            throw std::runtime_error(strerror(errno));
+    if (stat(vm_prepare, &buf) != 0)
+        if (mkdir(vm_prepare, 0755) == -1)
+            throw std::runtime_error(strerror(errno));
+    if (stat(vm_begin, &buf) != 0)
+        if (mkdir(vm_begin, 0755) == -1)
+            throw std::runtime_error(strerror(errno));
+    if (stat(end_sh, &buf) != 0)
+    {
+        std::ofstream file(end_sh);
+        file << "#END";
+        file.close();
+        if (chmod(end_sh, 0755) == -1)
+            throw std::runtime_error(strerror(errno));
+    }
+}
+
+std::string begin_script()
+{
+    return "";
+}
+
+std::string end_script()
+{
+    return "";
+}

src/main.cpp

@@ -0,0 +1,25 @@
+#include <iommu.h>
+#include <tools.h>
+#include <libvirt.h>
+
+int main()
+{
+    try
+    {
+        char cnf;
+        configure_iommu();
+
+        std::cout << "Do you want to install required packages automatically? (y/n) ";
+        std::cin >> cnf;
+        if (tolower(cnf) == 'y')
+            install_tools();
+        enable_services();
+        user_mod();
+        libvirt_hook();
+    }
+    catch (const std::runtime_error &err)
+    {
+        std::cerr << err.what() << std::endl;
+        return -1;
+    }
+}

src/shell.cpp

@@ -0,0 +1,16 @@
+#include <shell.h>
+
+std::string shell_cmd(char const *cmd)
+{
+    std::array<char, 128> buffer;
+    std::string resp;
+    std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd, "r"), pclose);
+    if (!pipe)
+        throw std::runtime_error("\n\033[1;31mThat was unexpected!\033[0m");
+
+    while (fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr)
+    {
+        resp += buffer.data();
+    }
+    return resp;
+}

src/sysinfo.cpp

@@ -0,0 +1,41 @@
+#include <sysinfo.h>
+
+std::string get_cpu_vendor()
+{
+    std::string cpu = "intel";
+    std::string res = shell_cmd("lspci | grep -i amd");
+
+    if (!res.empty())
+        cpu = "amd";
+    return cpu;
+}
+
+std::string get_gpu_vendor()
+{
+    std::string gpu = "amd";
+    std::string res = shell_cmd("lspci | grep -i nvidia");
+
+    if (!res.empty())
+        gpu = "nvidia";
+    return gpu;
+}
+
+std::string get_vga_slot()
+{
+    std::string c = "lspci | grep -i vga.*" + get_gpu_vendor();
+    std::string res = shell_cmd((char *)&c);
+
+    if (res.empty())
+        throw std::runtime_error("\n\033[1;31mCouldn't fetch VGA PCI slot!\033[0m");
+    return "0000:" + res.substr(0, res.find(" "));
+}
+
+std::string get_audio_slot()
+{
+    std::string c = "lspci | grep -i audio.*" + get_gpu_vendor();
+    std::string res = shell_cmd((char *)&c);
+
+    if (res.empty())
+        throw std::runtime_error("\n\033[1;31mCouldn't fetch Audio PCI slot!\033[0m");
+    return "0000:" + res.substr(0, res.find(" "));
+}

src/tools.cpp

@@ -0,0 +1,58 @@
+#include <tools.h>
+
+void install_tools()
+{
+    struct stat buf;
+    if (stat("/etc/arch-release", &buf) == 0)
+        system("pacman -S qemu libvirt edk2-ovmf virt-manager dnsmasq ebtables");
+    else if (stat("/etc/gentoo-release", &buf) == 0)
+        system("emerge -a qemu libvirt virt-manager dnsmasq ebtables");
+    else if (stat("/etc/debian_version", &buf) == 0)
+        system("apt install qemu-kvm libvirt-clients libvirt-daemon-system ovmf dnsmasq ebtables");
+    else if (stat("/etc/fedora-release", &buf) == 0)
+        system("dnf install @virtualization");
+    else
+        throw std::runtime_error("\n\033[1;31mUnsupported system. Install required tools manually.\033[0m");
+}
+
+void enable_services()
+{
+    std::string init_sys = get_init();
+    if (init_sys == "systemd")
+        system("systemctl enable --now libvirtd");
+    else // Other init systems?
+        std::cout << "Enable libvirtd service on your system manually..\n";
+    std::string res = shell_cmd("virsh net-list --all | grep -i default");
+
+    if (res.empty())
+    {
+        system("virsh net-start default");
+        system("virsh net-autostart default");
+    }
+}
+
+std::string get_init()
+{
+    std::ifstream bin("/sbin/init", std::ios::binary);
+    std::string line;
+    while (std::getline(bin, line))
+    {
+        if (line.find("/lib/systemd") != std::string::npos)
+            return "systemd";
+        else if (line.find("sysvinit") != std::string::npos)
+            return "sysvinit";
+        else if (line.find("upstart") != std::string::npos)
+            return "upstart";
+    }
+    return "";
+}
+
+void user_mod()
+{
+    std::string res = shell_cmd("usermod -aG kvm,input,libvirt $(logname)");
+    if (!res.empty())
+    {
+        std::string emsg = "\n\033[1;31m" + res + "\033[0m";
+        throw std::runtime_error(emsg);
+    }
+}