hope for the best

.gitignore

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+generator
+regionInfo.dat
+

Makefile

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+CXXFLAGS  = -g -Wall -Wwrite-strings
+EXEC      = generator
+
+all:
+	g++ $(CXXFLAGS) main.cpp -o $(EXEC)
+
+clean: 
+	rm -f *.o *.bak core $(EXEC)

README.md

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+# Custom `regionInfo.dat` generator for Among Us
+**This is an ugly C/C++ program held together with tape!**
+
+This program generates a regionInfo.dat file to allow Among Us to connect to custom servers like [Impostor](https://github.com/AeonLucid/Impostor/).
+
+## Building on Android
+1. Install Termux, run `termux-setup-storage` and allow for disk access.
+2. Install via CLI clang and make (and git if you want to clone this repo with it)
+3. cd into the repo and run `make all`
+4. ???
+5. Profit!
+
+## How to run
+run `./generator` with the following options
+
+- `-s [server address]` to specify on which server you want the game to connect
+- `-p [port]` to specify the port, it defaults to the default port
+- `-o [file]` to specify on which file you want to write, it defaults to `/sdcard/Android/data/com.innersloth.spacemafia/files/regionInfo.dat`
+
+
+## F.A.Q.
+
+### Why not a Java Android app?
+I don't worship cows so I'm really handy with Android development. Also this program is meant as a quick and dirty utility with no time nor the desire to mess around GUI toolkits
+

main.cpp

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+#include <iostream>
+#include <fstream>
+#include <unistd.h>
+
+#include<netdb.h>
+#include<arpa/inet.h>
+
+int main(int argc, char **argv)
+{
+	std::string fileName = "/sdcard/Android/data/com.innersloth.spacemafia/files/regionInfo.dat";
+	std::string serverAddress = "localhost";
+	uint16_t port = 22023;
+	std::ofstream file;
+	int option = -1;
+	uint32_t zero32 = 0;
+	uint32_t serverLen = 1;
+	uint8_t strLen;
+
+	hostent *he = nullptr;
+	std::string ipAddress;
+
+	do
+	{
+		option = getopt(argc, argv, "s:p:o:");
+
+		switch(option)
+		{
+		case 's':
+			serverAddress = optarg;
+			break;
+		case 'p':
+			port = std::stoi(optarg);
+			break;
+		case 'o':
+			fileName = optarg;
+			break;
+		}
+	}
+	while(option != -1);
+
+	// Resolving hostname
+	he = gethostbyname(serverAddress.c_str());
+
+	if(!he || he->h_addr_list == nullptr)
+	{
+		std::cerr << "Error resolving the net address " << serverAddress << '\n';
+		return -1;
+	}
+
+	ipAddress = inet_ntoa(**(in_addr **)he->h_addr_list);
+
+	file = std::ofstream(fileName, std::ios::binary);
+	if(!file)
+	{
+		std::cerr << "I/O error\n";
+		return -1;
+	}
+
+	// Region info
+	file.write((char*)&zero32, sizeof(uint32_t));
+	file.write("\x08Impostor", 9);
+
+	// Region address
+	strLen = serverAddress.size();
+	file.write((char*)&strLen, sizeof(uint8_t));
+	file << serverAddress;
+
+	// N of servers (always 1)
+	file.write( (char*)&serverLen, sizeof(uint32_t));
+
+	// First and only server name
+	file << "\x11Impostor-Master-1";
+
+	// First and only server address (numeric form not as string)
+	file.write((char*)&(*(in_addr **)he->h_addr_list)->s_addr, sizeof(uint32_t));
+	file.write((char*)&port, sizeof(uint16_t));
+
+	file.write((char*)&zero32, sizeof(uint32_t));
+
+	file.close();
+
+	return 0;
+}