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Sing Yu Chan pexcn

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@pexcn
pexcn / patch-rtc.py
Last active September 15, 2015 09:49 — forked from Lekensteyn/patch-rtc.py
Script to patch an Android recovery.img file, changing the qcom,qpnp-rtc-write Device Tree property (tested with an Android 5.1 image based on kernel 3.4 for a Nexus 5 (rev_11)).
#!/usr/bin/env python
"""
Patch a recovery image to enable RTC writing
Unfortunately it has not the intended effect (tested from recovery):
~ # /system/xbin/hwclock -w
hwclock: RTC_SET_TIME: Operation not permitted
<3>[ 25.821247] spmi_pmic_arb fc4cf000.qcom,spmi: pmic_arb_wait_for_done: transaction denied (0x5)
<3>[ 25.821338] qcom,qpnp-rtc qpnp-rtc-ee162000: SPMI write failed
@pexcn
pexcn / simple-obfs-and-chinadns-compile-for-windows.md
Last active June 19, 2021 05:11

ChinaDNS

Deprecated

git clone https://github.com/pexcn/ChinaDNS.git && pushd ChinaDNS
./autogen.sh
CFLAGS="-O3 -ffast-math" ./configure --enable-static
make
strip src/chinadns.exe
popd
@pexcn
pexcn / ChinaDNS Flow.md
Last active February 6, 2023 03:03
记录一下 ChinaDNS 的工作原理和一些 DNS 相关的想法

ChinaDNS 的工作流程

ChinaDNS 的上游 DNS 分为 国内 DNS 和 可信 DNS。

工作流程

  1. ChinaDNS 会同时向上游的 DNS 发送请求。
  2. 如果 可信 DNS 先返回，则直接采用 可信 DNS 的结果。
  3. 如果 国内 DNS 先返回，分两种情况：如果返回的结果是国内的 IP, 则采用；否则丢弃并转而采用 可信 DNS 的结果。
@pexcn
pexcn / auto-sign.sh
Created March 4, 2018 11:54
china unicom mobile client auto sign script
#!/bin/bash -xe
# Replace ******** with your token
export SIGN_IN_URL=http://m.client.10010.com/SigninApp/signin/querySigninActivity.htm?token=********
export DAY_SIGN_URL=http://m.client.10010.com/SigninApp/signin/daySign.do
export SCRIPT_PATH=$(dirname $0)
echo "$(date +'%Y-%m-%d %T')" >> $SCRIPT_PATH/log.txt
curl $SIGN_IN_URL \
@pexcn
pexcn / java_extract.bat
Created September 5, 2018 13:31 — forked from milolav/java_extract.bat
Batch file to extract portable version of java jre or jdk from installer
@echo off
rem Batch file that extracts java from installer
rem Original topic on stackoverflow:
rem http://stackoverflow.com/questions/1619662/how-can-i-get-the-latest-jre-jdk-as-a-zip-file-rather-than-exe-or-msi-installe
setlocal
if [%1]==[] goto usage
set fn=%~n1
7z.exe e %1 .rsrc\1033\JAVA_CAB10\111
if errorlevel 1 goto err
@pexcn
pexcn / hh_repart
Last active July 5, 2022 09:53
System partition resize script for Nexus 5.
#!/sbin/sh
#
# Copyright (C) 2018 Unlegacy Android Project
# Copyright (C) 2018 Svyatoslav Ryhel
# Copyright (C) 2019 Nick80835
# Copyright (C) 2019 z3dd3r
#
# Made for Hammerhead
#
@pexcn
pexcn / sdcard_write_test.md
Created September 2, 2019 09:29

SDCard Write Speed Test

# 64k
dd if=/dev/zero of=test bs=64k count=1638 && rm -f test
dd if=/dev/zero of=test bs=64k count=1638 conv=fdatasync && rm -f test
dd if=/dev/zero of=test bs=64k count=1638 conv=fsync && rm -f test
dd if=/dev/zero of=test bs=64k count=1638 oflag=dsync && rm -f test
# 1024k
dd if=/dev/zero of=test bs=1024k count=100 &amp;&amp; rm -f test
@pexcn
pexcn / fix_google_play_uncertified.md
Last active September 3, 2019 14:19

https://www.google.com/android/uncertified

# disable root at first.

# backup
adb shell sqlite3 /data/data/com.google.android.gsf/databases/gservices.db \"select * from main where name='android_id'\"
# update
adb shell sqlite3 /data/data/com.google.android.gsf/databases/gservices.db \"update main set value='<my_certified_android_id>' where name='android_id'\"
# check
@pexcn
pexcn / dump_art_partition.md
Last active February 25, 2022 18:03
dump atheros art partition from full firmware. 
# 4MB
# art: 0x003F0000-0x00400000, 65536 bytes
dd if=full.bin of=art.bin bs=1 count=65536 skip=4128768

# 8MB
# art: 0x007F0000-0x00800000, 65536 bytes
dd if=full.bin of=art.bin bs=1 count=65536 skip=8323072

# 16MB
@pexcn
pexcn / synoboot_extra_lzma_unpack_and_repack.md
Created January 4, 2020 08:04 
# unpack
bsdcpio -id < ../extra.lzma

# repack
find . | cpio -o --format='newc' --owner root:root | lzma > ../extra.lzma