cam-reverse/asd.js

import { replaceFunctions } from "./func_replacements.js";

const hook_fn = (name_in_elf, enter, leave) => {
  var symbol_addr = DebugSymbol.fromName(name_in_elf).address;
  console.log(`${name_in_elf} addr is: ${symbol_addr}, this is ${this}`);
  Interceptor.attach(symbol_addr, {
    onEnter: enter,
    onLeave: leave,
  });
  console.log(`Hooked ${name_in_elf}`);
};

function hook_export_fn(name_in_elf, enter, leave) {
  var symbol_addr = Module.findExportByName("libvdp.so", name_in_elf);
  console.log(`${name_in_elf} addr is: ${symbol_addr}`);
  Interceptor.attach(symbol_addr, {
    onEnter: enter,
    onLeave: leave,
  });
  console.log(`Hooked ${name_in_elf}`);
}

const hook_p2p_read = () => {
  var mangled_sym = "_Z8p2p_readPiihPci";
  hook_export_fn(
    mangled_sym,
    (args) => {
      //    console.log(hexdump(
      //        args[0], {offset : 0, length : 0x200, header : true, ansi :
      //        false}));

      let m_type = args[1];
      let m_unk3 = args[2];

      let m_size = args[4].toInt32();
      console.log(m_type, m_unk3, m_size);
    },
    () => {},
  );
};

const hook___android_log_print = () => {
  const sym = "__android_log_print";
  hook_fn(
    sym,
    (args) => {
      // let _prio = args[0].toInt32();
      // let _tag = args[1].readCString();
      let fmt = args[2].readCString();
      // console.log(fmt); // debug if crashes due to missing placeholder
      const types = placeholderTypes(fmt); // ['s', 'd', ..]`

      let o = {
        s: (x) => x.readCString(),
        d: (x) => x.toInt32(),
        u: (x) => x.toInt32(),
        z: (x) => x.toInt32(), // FIXME
        l: (x) => x.toInt32(), // FIXME
        x: (x) => x.toInt32().toString(16),
        f: (x) => x.toFloat(),
      };

      const values = types.map((t, idx) => o[t](args[idx + 3]));
      const newStr = sprintf(fmt, values);
      //console.log(newStr); // FIXME
    },
    () => {},
  );
};

const hook_in_out_buf = (sym, insize, outsize) => {
  let obj = {};
  hook_fn(
    sym,
    (args) => {
      console.log(`onEnter ${sym} ${this}`);
      obj.outbuf = args[0];
      obj.inbuf = args[1];
    },
    (retval) => {
      console.log(`${sym} done, dumping`);
      console.log("in");
      console.log(obj.inbuf.readByteArray(insize));
      console.log("out");
      console.log(obj.outbuf.readByteArray(outsize));
      console.log("retval", retval);
    },
  );
};
let indent = 0;

function doReplaceFunctions() {
  // const prefixes = ["Send_Pkt*", "P2P*", "*RcvTh*", "parse_*"]; // "XQP2P*",
  // const prefixes = ["parse_*", "pack_*", "Send_Pkt*", "create_*"];
  const prefixes = ["create_*", "pack_*"];
  const spam = [
    "XQP2P_Check_Buffer",
    "P2P_ChannelBufferCheck",
    "create_android_logger",
  ];

  const replaced = replaceFunctions();

  prefixes
    .map((prefix) => DebugSymbol.findFunctionsMatching(prefix))
    .flat()
    .map(DebugSymbol.fromAddress)
    .filter((dbg) => !spam.includes(dbg.name))
    .map((dbg) => {
      Interceptor.attach(dbg.address, {
        onEnter: (args) => {
          indent = indent + 1;
          let flag = !replaced.includes(dbg.name) ? "[NOT REPLACED] " : "";
          console.log(" ".repeat(indent) + flag + dbg.name);
        },
        onLeave: (retval) => {
          indent = indent - 1;
        },
      });
      console.log(`Hooked ${dbg.name}`);
    });
}
function doHooks() {
  var libnative_addr = Module.findBaseAddress("libvdp.so");
  if (libnative_addr) {
    hook___android_log_print();
    // hook_create_P2pRdy();
    // hook_in_out_buf("create_LstReq", 0x1c, 0x1c);
    //hook_in_out_buf("create_P2pRdy", 0x1c, 0x1c);
    doReplaceFunctions();

    // hook_p2p_read();
    // hook_pack_P2pId();
    // hook_pack_ClntPkt();
  } else {
    console.log("NO WORKING");
  }
}

const matchy = /%[0-9.-]*([a-z])/g;
const replacy = /(.*?)%[0-9.-]*([a-z])/g;

const placeholderTypes = (str) => {
  // '%-16s, line %4d, %-16s:ret=%d,broadcast lan_seach to %s:%.3f!!!!'
  // =>
  // [ 's', 'd', 's', 'd', 's', 'f' ]
  return [...str.matchAll(matchy)].map((m) => m[1]);
};
const sprintf = (str, values) => {
  // '%-16s, line %4d, %-16s:ret=%d,broadcast lan_seach to %s:%.3f!!!!' +
  // ["asd", 20, ...]
  // =>
  // asd, line 20, ...
  const matches = str.matchAll(replacy);
  return [...matches].map((m, idx) => m[1] + values[idx].toString()).join("");
};
setImmediate(doHooks);