pax_global_header 0000666 0000000 0000000 00000000064 13777076115 0014530 g ustar 00root root 0000000 0000000 52 comment=f3635bba841a71109b84585936e4636f9b84c2a7
graftcp-0.3.1+ds1/ 0000775 0000000 0000000 00000000000 13777076115 0013642 5 ustar 00root root 0000000 0000000 graftcp-0.3.1+ds1/.github/ 0000775 0000000 0000000 00000000000 13777076115 0015202 5 ustar 00root root 0000000 0000000 graftcp-0.3.1+ds1/.github/ISSUE_TEMPLATE/ 0000775 0000000 0000000 00000000000 13777076115 0017365 5 ustar 00root root 0000000 0000000 graftcp-0.3.1+ds1/.github/ISSUE_TEMPLATE/bug_report.md 0000664 0000000 0000000 00000001437 13777076115 0022064 0 ustar 00root root 0000000 0000000 ---
name: Bug report
about: Create a report to help us improve
---
**Describe the bug**
A clear and concise description of what the bug is.
**To Reproduce**
Steps to reproduce the behavior:
1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error
**Expected behavior**
A clear and concise description of what you expected to happen.
**Screenshots**
If applicable, add screenshots to help explain your problem.
**Desktop (please complete the following information):**
- OS: [e.g. iOS]
- Browser [e.g. chrome, safari]
- Version [e.g. 22]
**Smartphone (please complete the following information):**
- Device: [e.g. iPhone6]
- OS: [e.g. iOS8.1]
- Browser [e.g. stock browser, safari]
- Version [e.g. 22]
**Additional context**
Add any other context about the problem here.
graftcp-0.3.1+ds1/.github/ISSUE_TEMPLATE/custom.md 0000664 0000000 0000000 00000000133 13777076115 0021216 0 ustar 00root root 0000000 0000000 ---
name: Custom issue template
about: Describe this issue template's purpose here.
---
graftcp-0.3.1+ds1/.github/ISSUE_TEMPLATE/feature_request.md 0000664 0000000 0000000 00000001060 13777076115 0023107 0 ustar 00root root 0000000 0000000 ---
name: Feature request
about: Suggest an idea for this project
---
**Is your feature request related to a problem? Please describe.**
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
**Describe the solution you'd like**
A clear and concise description of what you want to happen.
**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.
**Additional context**
Add any other context or screenshots about the feature request here.
graftcp-0.3.1+ds1/.travis.yml 0000664 0000000 0000000 00000000263 13777076115 0015754 0 ustar 00root root 0000000 0000000 language: go
go:
- "1.6"
- "1.9"
- "1.10"
compiler:
- gcc
script:
- pwd
- go version
- make
- sudo make install
graftcp-0.3.1+ds1/COPYING 0000664 0000000 0000000 00000104513 13777076115 0014701 0 ustar 00root root 0000000 0000000 GNU GENERAL PUBLIC LICENSE
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17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
Copyright (C)
This program 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.
This program 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 this program. If not, see .
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
Copyright (C)
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
.
graftcp-0.3.1+ds1/Makefile 0000664 0000000 0000000 00000004260 13777076115 0015304 0 ustar 00root root 0000000 0000000 # "Makefile" for graftcp.
# Copyright (C) 2016, 2018, 2020 Hmgle
#
# This program 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.
#
# This program 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 this program. If not, see .
KERNEL = $(shell uname -s)
ifneq ($(KERNEL), Linux)
$(error only support Linux now.)
endif
VERSION = $(shell git describe --tags --always)
debug = 0
PREFIX = /usr/local
BINDIR = $(PREFIX)/bin
INSTALL = install -D
CFLAGS += -Wall
ifeq ($(debug), 1)
CFLAGS += -O0 -g
else
CFLAGS += -O2 -DNDEBUG
endif
ifneq ($(shell echo $(VERSION) | head -c 1), v)
VERSION=v0.3
endif
CFLAGS += -DVERSION=\"$(VERSION)\"
SRC := $(wildcard *.c)
GRAFTCP_LOCAL_BIN = graftcp-local/graftcp-local
TARGET = graftcp $(GRAFTCP_LOCAL_BIN)
all:: $(TARGET)
graftcp: main.o util.o string-set.o
$(CC) $^ -o $@
%.o: %.c
$(CC) $(CFLAGS) -c -o $@ $<
$(GRAFTCP_LOCAL_BIN)::
$(MAKE) -C graftcp-local VERSION=$(VERSION)
install:: graftcp $(GRAFTCP_LOCAL_BIN)
$(INSTALL) $< $(DESTDIR)$(BINDIR)/$<
$(MAKE) -C graftcp-local $@
uninstall:: $(GRAFTCP_LOCAL_BIN)
-rm -f $(DESTDIR)$(BINDIR)/graftcp
$(MAKE) -C graftcp-local $@
install_graftcp:: graftcp
$(INSTALL) $< $(DESTDIR)$(BINDIR)/$<
uninstall_graftcp::
-rm -f $(DESTDIR)$(BINDIR)/graftcp
install_systemd::
$(MAKE) -C graftcp-local install_systemd
uninstall_systemd::
$(MAKE) -C graftcp-local uninstall_systemd
install_graftcp_local::
$(MAKE) -C graftcp-local install
uninstall_graftcp_local::
$(MAKE) -C graftcp-local uninstall
sinclude $(SRC:.c=.d)
%.d: %.c
@set -e; rm -f $@; \
$(CC) -MM $(CPPFLAGS) $< > $@.$$$$; \
sed 's,\(.*\)\.o[:]*,\1.o $@:,' < $@.$$$$ > $@; \
rm -f $@.$$$$
clean::
-rm -f *.o graftcp *.d
$(MAKE) -C graftcp-local $@
graftcp-0.3.1+ds1/README.md 0000664 0000000 0000000 00000025107 13777076115 0015126 0 ustar 00root root 0000000 0000000
# graftcp
[](https://travis-ci.org/hmgle/graftcp)
**English** | [简体中文](./README.zh-CN.md)
## Introduction
`graftcp` can redirect the TCP connection made by the given program \[application, script, shell, etc.\] to SOCKS5 or HTTP proxy.
Compared with [tsocks](https://linux.die.net/man/8/tsocks), [proxychains](http://proxychains.sourceforge.net/) or [proxychains-ng](https://github.com/rofl0r/proxychains-ng), `graftcp` is not using the [LD_PRELOAD trick](https://stackoverflow.com/questions/426230/what-is-the-ld-preload-trick) which only work for dynamically linked programs, e.g., [applications built by Go can not be hook by proxychains-ng](https://github.com/rofl0r/proxychains-ng/issues/199). `graftcp` can trace or modify any
given program's connect by [`ptrace(2)`](https://en.wikipedia.org/wiki/Ptrace), so it is workable for any program. The principle will be explained in this paragraph of [how does it work](#principles).
## Installation
### Install from source
`graftcp` runs on Linux. Building `graftcp-local` requires [Go](https://golang.org/doc/install) installed.
```sh
git clone https://github.com/hmgle/graftcp.git
cd graftcp
make
```
After make finishes, you'll be able to use `graftcp-local/graftcp-local` and `./graftcp`.
Optionally, you can also install them to system:
```sh
sudo make install
# Enable and activate systemed unit
sudo make install_systemd
```
### Install from binary package
TODO
## Usage
`graftcp-local`:
```console
$ graftcp-local/graftcp-local -h
Usage of graftcp-local/graftcp-local:
-config string
Path to the configuration file
-http_proxy string
http proxy address, e.g.: 127.0.0.1:8080
-listen string
Listen address (default ":2233")
-logfile string
Write logs to file
-loglevel value
Log level (0-6) (default 1)
-pipepath string
Pipe path for graftcp to send address info (default "/tmp/graftcplocal.fifo")
-select_proxy_mode string
Set the mode for select a proxy [auto | random | only_http_proxy | only_socks5] (default "auto")
-service string
Control the system service: ["start" "stop" "restart" "install" "uninstall"]
-socks5 string
SOCKS5 address (default "127.0.0.1:1080")
-syslog
Send logs to the local system logger (Eventlog on Windows, syslog on Unix)
```
`graftcp`:
```console
$ graftcp -h
Usage: graftcp [options] prog [prog-args]
Options:
-a --local-addr=
graftcp-local's IP address. Default: localhost
-p --local-port=
Which port is graftcp-local listening? Default: 2233
-f --local-fifo=
Path of fifo to communicate with graftcp-local.
Default: /tmp/graftcplocal.fifo
-b --blackip-file=
The IP in black-ip-file will connect direct
-w --whiteip-file=
Only redirect the connect that destination ip in the
white-ip-file to SOCKS5
-n --not-ignore-local
Connecting to local is not changed by default, this
option will redirect it to SOCKS5
-h --help
Display this help and exit
```
## Demo
Assume you are running the SOCKS5 proxy with the default IP address: "localhost:1080". Start the `graftcp-local` first:
```sh
graftcp-local/graftcp-local
```
Install the Go package from golang.org (now is blocked by the GFW) via `graftcp`:
```sh
./graftcp go get -v golang.org/x/net/proxy
```
Open `Chromium` / `Chrome` / `Firefox` browser via `graftcp`, then all the requests from this browser will redirect to the SOCKS5 proxy:
```sh
./graftcp chromium-browser
```
Launch `Bash` / `Zsh` / `Fish` via `graftcp`, then all the TCP traffic generated by the command in this shell will redirect to the SOCKS5 proxy:
```console
% ./graftcp bash
$ wget https://www.google.com
```

## How does it work?
To achieve the goal of redirecting the TCP connection of a app to another destination address and the app itself is not aware of it, these conditions are probably required:
- `fork(2)` a new process and trace it using `ptrace(2)`, `execve(2)` to run the app. Every `connect(2)` syscall will be intercepted, then get the destination address argument and send it to `graftcp-local` via `pipe`.
- Modify the destination address argument of `connect(2)` to `graftcp-local`'s address, and restart the stopped syscall. After the syscall returns successfully, the app thought it has connected the original destination address, but in face it connected the `graftcp-local`, so we named it "graft".
- `graftcp-local` establish a SOCKS5 connection based on the information of app's original destination address, then redirect the requests from the app to the SOCKS5 proxy.
Someone may have a question here: since we can modify the arguments of a syscall, modify the app's `write(2)` / `send(2)` buf argument, attach the original destination information to the `write` buffer, isn't it simpler? The answer is that cannot be done. Because attach data to the buffer of the tracked child process, it may case a buffer overflow, causing crash or overwrite other data.
In addition, as the [`execve(2)` will detach and unmap all shared memory](http://man7.org/linux/man-pages/man2/execve.2.html), we also cannot add extra data to the `write` buffer of traced app by sharing memory, so we send the original destination address via `pipe`.
The simple sketch is as follows:
```
+---------------+ +---------+ +--------+ +------+
| graftcp | dest host | | | | | |
| (tracer) +---PIPE----->| | | | | |
| ^ | info | | | | | |
| | ptrace | | | | | | |
| v | | | | | | |
| +---------+ | | | | | | |
| | | | connect | | connect | | connect | |
| | +--------------->| graftcp +-------->| SOCKS5 +-------->| dest |
| | | | | -local | | or | | host |
| | app | | req | | req | HTTP | req | |
| |(tracee) +--------------->| +-------->| proxy +-------->| |
| | | | | | | | | |
| | | | resp | | resp | | resp | |
| | |<---------------+ |<--------+ |<--------+ |
| +---------+ | | | | | | |
+---------------+ +---------+ +--------+ +------+
```
## FAQ and Tips
### What are some ways to redirect TCP connections?
The main ones are: global way, environment variables setting way, and programs selection way.
Global way: e.g., use `iptables` + `RedSocks` to convert the system's traffic that match certain rules into SOCKS5 traffic. The pros is that it is globally effective; the cons is that all traffic that satisfies the rule is redirected, and the scope of influence is large.
Environment variable setting: some programs will read the proxy-related environment variables to determine whether to convert their own traffic to the corresponding proxy protocol traffic, such as `curl` will [read `http_proxy`, `ftp_proxy`, `all_proxy ` Environment variables and decide which proxy traffic to convert based on the request URL scheme](https://curl.haxx.se/libcurl/c/CURLOPT_PROXY.html). This way is effective only if the program itself implements the traffic conversion function, so
it is very limited.
programs selection way: this way can only perform redirection for specified programs, such as `tsocks` or `proxychains`. As mentioned earlier, they were using the `LD_PRELOAD` hijacking dynamic library function, and the default static link compiled program such as `Go` is invalid. `graftcp` improves this by being able to redirect TCP connections from any program.
### Will `graftcp` redirect the connection to the SOCKS5 proxy if the target address is localhost?
No. By default, `graftcp` ignore the connections to localhost. If you want to redirect all addresses, you can use the `-n` option. If you want to ignore more addresses, you can add them to the blacklist IP file; if you want to redirect only certain IP addresses, you can add them to the whitelist IP file. Use `graftcp --help` to get more information.
### I am suffering a DNS cache poisoning attack, does `graftcp` handle DNS requests?
No. `graftcp` currently only handles TCP connections. [`dnscrypt-proxy`](https://github.com/jedisct1/dnscrypt-proxy) or `ChinaDNS` may help you.
### The `clone(2)`'s argument has a flag `CLONE_UNTRACED` to avoid being traced, how does `graftcp` do forced tracing?
`graftcp` will intercept the `clone(2)` syscall, and clearing the `CLONE_UNTRACED` flag, so the tracked child process could not escape the fate of being tracked. In addition, this `CLONE_UNTRACED` flag is intended for the kernel, and user space program should not set it.
Linux provides a way to limit the `ptrace(2)`: set the value of [`/proc/sys/kernel/yama/ptrace_scope`](https://www.kernel.org/doc/Documentation/security/Yama.txt). If `ptrace(2)` is invalid, check if the default value has been modified.
### Does it support macOS?
No. macOS's [`ptrace(2)`](http://polarhome.com/service/man/?qf=ptrace&af=0&sf=0&of=Darwin&tf=2) is useless. ~~However, it can also be achieved theoretically by referring to `DTrace`~~. See [issue 12](https://github.com/hmgle/graftcp/issues/12). Anyone try it? :grin:
## TODO
- [ ] ARM/Linux Support
- [ ] i386/Linux Support
## Acknowledgements and References
- [maybe](https://github.com/p-e-w/maybe), [proxychains](http://proxychains.sourceforge.net/) and [proxychains-ng](https://github.com/rofl0r/proxychains-ng) for inspiration
- [strace](https://strace.io/)
- [uthash](https://troydhanson.github.io/uthash/)
- [service](https://github.com/kardianos/service)
- [dlog](https://github.com/jedisct1/dlog)
## LICENSE
Copyright © 2016, 2018-2020 Hmgle
Released under the terms of the [GNU General Public License, version 3](https://www.gnu.org/licenses/gpl-3.0.html)
graftcp-0.3.1+ds1/README.zh-CN.md 0000664 0000000 0000000 00000024435 13777076115 0016047 0 ustar 00root root 0000000 0000000 # graftcp
[](https://travis-ci.org/hmgle/graftcp)
[English](./README.md) | **简体中文**
## 简介
`graftcp` 可以把任何指定程序(应用程序、脚本、shell 等)的 TCP 连接重定向到 SOCKS5 或 HTTP 代理。
对比 [tsocks](https://linux.die.net/man/8/tsocks)、[proxychains](http://proxychains.sourceforge.net/) 或 [proxychains-ng](https://github.com/rofl0r/proxychains-ng),`graftcp` 并不使用 [LD_PRELOAD 技巧](https://stackoverflow.com/questions/426230/what-is-the-ld-preload-trick)来劫持共享库的 connect()、getaddrinfo()
等系列函数达到重定向目的,这种方法只对使用动态链接编译的程序有效,对于静态链接编译出来的程序,例如[默认选项编译的 Go 程序](https://golang.org/cmd/link/),[proxychains-ng 就无效了](https://github.com/rofl0r/proxychains-ng/issues/199)。`graftcp` 使用 [`ptrace(2)`](https://en.wikipedia.org/wiki/Ptrace) 系统调用跟踪或修改任意指定程序的 connect 信息,对任何程序都有效。[工作原理](#principles)后面将会解释。
## 安装
### 源码安装
`graftcp` 在 Linux 系统内运行。 `graftcp-local` 使用 Go 编写, [Go](https://golang.org/doc/install) 环境是必需的。
```
git clone https://github.com/hmgle/graftcp.git
cd graftcp
make
```
make 执行完后,即可运行 `graftcp-local/graftcp-local` 和 `./graftcp`。可以把它们都安装进系统:
```sh
sudo make install
# Enable and activate systemed unit
sudo make install_systemd
```
### 二进制包安装
TODO
## 用法参数
`graftcp-local`:
```console
$ graftcp-local/graftcp-local -h
Usage of graftcp-local/graftcp-local:
-config string
Path to the configuration file
-http_proxy string
http proxy address, e.g.: 127.0.0.1:8080
-listen string
Listen address (default ":2233")
-logfile string
Write logs to file
-loglevel value
Log level (0-6) (default 1)
-pipepath string
Pipe path for graftcp to send address info (default "/tmp/graftcplocal.fifo")
-select_proxy_mode string
Set the mode for select a proxy [auto | random | only_http_proxy | only_socks5] (default "auto")
-service string
Control the system service: ["start" "stop" "restart" "install" "uninstall"]
-socks5 string
SOCKS5 address (default "127.0.0.1:1080")
-syslog
Send logs to the local system logger (Eventlog on Windows, syslog on Unix)
```
`graftcp`:
```console
$ graftcp -h
Usage: graftcp [options] prog [prog-args]
Options:
-a --local-addr=
graftcp-local's IP address. Default: localhost
-p --local-port=
Which port is graftcp-local listening? Default: 2233
-f --local-fifo=
Path of fifo to communicate with graftcp-local.
Default: /tmp/graftcplocal.fifo
-b --blackip-file=
The IP in black-ip-file will connect direct
-w --whiteip-file=
Only redirect the connect that destination ip in the
white-ip-file to SOCKS5
-n --not-ignore-local
Connecting to local is not changed by default, this
option will redirect it to SOCKS5
-h --help
Display this help and exit
```
## 使用示例
假设你正在运行默认地址 "localhost:1080" 的 SOCKS5 代理,首先启动 `graftcp-local`:
```sh
graftcp-local/graftcp-local
```
通过 `graftcp` 安装来自 golang.org 的 Go 包:
```sh
./graftcp go get -v golang.org/x/net/proxy
```
通过 `graftcp` 打开 `Chromium` / `Chrome` / `Firefox` 浏览器,网页的所有请求都会重定向到 SOCKS5 代理:
```sh
./graftcp chromium-browser
```
通过 `graftcp` 启动 `Bash` / `Zsh` / `Fish`,在这个新开的 shell 里面执行的任何新命令产生的 TCP 连接都会重定向到 SOCKS5 代理:
```console
% ./graftcp bash
$ wget https://www.google.com
```

## 工作原理
要达到重定向一个 app 发起的的 TCP 连接到其他目标地址并且该 app 本身对此毫无感知的目的,大概需要这些条件:
- `fork(2)` 一个新进程,通过 `execve(2)` 启动该 app,并使用 `ptrace(2)` 进行跟踪,在 app 执行每一次 TCP 连接前,捕获并拦截这次 `connect(2)` 系统调用,获取目标地址的参数,并通过管道传给 `graftcp-local`。
- 修改这次 `connect(2)` 系统调用的目标地址参数为 `graftcp-local` 的地址,然后恢复执行被中断的系统调用。返回成功后,这个程序以为自己连的是原始的地址,但其实连的是 `graftcp-local` 的地址。这个就叫“移花接木”。
- `graftcp-local` 根据连接信息和目标地址信息,与 SOCKS5 proxy 建立连接,把 app 的请求的数据重定向到 SOCKS5 proxy。
这里可能有个疑问:既然可以修改任何系统调用的参数,那么通过修改 app 的 `write(2)` / `send(2)` 的参数,直接往 `buffer` 里面附加原始目标地址信息给 `graftcp-local` 不是更简单吗?答案是这无法做到。如果直接往运行在子进程的被跟踪程序的 `buffer` 添加信息,可能会造成缓冲区溢出,造成程序崩溃或者覆盖了其他数据。
另外,[`execve(2)` 会分离所有的共享内存](http://man7.org/linux/man-pages/man2/execve.2.html),所以也不能通过共享内存的方式让被跟踪的 app 的 `write` buffer 携带更多的数据,因此这里采用管道方式给 `graftcp-local` 传递原始的目标地址信息。
简单的流程如下:
```
+---------------+ +---------+ +--------+ +------+
| graftcp | dest host | | | | | |
| (tracer) +---PIPE----->| | | | | |
| ^ | info | | | | | |
| | ptrace | | | | | | |
| v | | | | | | |
| +---------+ | | | | | | |
| | | | connect | | connect | | connect | |
| | +--------------->| graftcp +-------->| SOCKS5 +-------->| dest |
| | | | | -local | | or | | host |
| | app | | req | | req | HTTP | req | |
| |(tracee) +--------------->| +-------->| proxy +-------->| |
| | | | | | | | | |
| | | | resp | | resp | | resp | |
| | |<---------------+ |<--------+ |<--------+ |
| +---------+ | | | | | | |
+---------------+ +---------+ +--------+ +------+
```
## 常见问题解答及技巧
### 有哪些重定向 TCP 连接的方式?
主要有: 全局式、设置环境变量式和仅针对程序(或进程)式。
全局式:比如使用 `iptables` + `RedSocks` 可以把系统符合一定规则的流量转换为 SOCKS5 流量。这种方式的优点是全局有效;缺点是所有满足该规则的流量都被重定向了,影响范围较大。
设置环境变量方式:一些程序启动时会读取 proxy 相关的环境变量来决定是否将自己的数据转换为对应代理协议的流量,比如 `curl` 会[读取 `http_proxy`, `ftp_proxy`, `all_proxy` 环境变量并根据请求 scheme 来决定转换为哪种代理流量](https://curl.haxx.se/libcurl/c/CURLOPT_PROXY.html)。这种方法只有程序本身实现了转换的功能才有效,局限性较大。
仅针对程序方式: 这种方式可以仅针对特定的程序执行重定向,比如 `tsocks` 或 `proxychains`。如前面提到,它们之前都是使用 `LD_PRELOAD` 劫持动态库方式实现,对 `Go` 之类默认静态链接编译的程序就无效了。`graftcp` 改进了这一点,能够重定向任何程序的 TCP 连接。
### 如果应用程序连接的目标地址是本机,使用 `graftcp` 会把该连接重定向到 SOCKS5 代理吗?
不会。默认会忽略目标地址为本地的连接,如果想重定向所有地址的话,可以使用 `-n`选项。如果想忽略更多的地址,可以把它们加入黑名单 IP 文件;如果想仅重定向某些 IP 地址,可以把这些地址加入白名单 IP 文件。使用 `graftcp --help` 获取设置参数。
### 我的 DNS 请求受到污染,`graftcp` 会处理 DNS 请求吗?
不会。`graftcp` 目前仅处理 TCP 连接。建议使用 `dnscrypt-proxy` 或 `ChinaDNS` 等方式解决 DNS 污染问题。
### `clone(2)` 参数有个叫 `CLONE_UNTRACED` 的标志位,可以避免让父进程跟踪到自己,`graftcp` 是如何做到强制跟踪的?
`graftcp` 在子进程调用 `clone(2)` 之前会把它拦截,清除这个 `CLONE_UNTRACED` 标志位,所以被跟踪的子进程最终还是难逃被跟踪的命运。另外,这个 `CLONE_UNTRACED` 标志位本意是给内核使用的,普通程序不应该去设置它。
Linux 提供了一种限制被 `ptrace(2)` 跟踪的方法:设置 [`/proc/sys/kernel/yama/ptrace_scope`](https://www.kernel.org/doc/Documentation/security/Yama.txt) 的值,若 `ptrace(2)` 失效,请检查该值是否被修改过。
### 支持 macOS 吗?
不。macOS 的 [`ptrace(2)`](http://polarhome.com/service/man/?qf=ptrace&af=0&sf=0&of=Darwin&tf=2) 是个半残品。~~不过理论上参考 DTrace那一套也能实现~~,见[issue 12](https://github.com/hmgle/graftcp/issues/12)。或许有兴趣的同学可以趟下这趟浑水 :grin:
## TODO
- [ ] ARM/Linux 支持
- [ ] i386/Linux 支持
## 感谢及参考
- [maybe](https://github.com/p-e-w/maybe), [proxychains](http://proxychains.sourceforge.net/) and [proxychains-ng](https://github.com/rofl0r/proxychains-ng) for inspiration
- [strace](https://strace.io/)
- [uthash](https://troydhanson.github.io/uthash/)
- [service](https://github.com/kardianos/service)
- [dlog](https://github.com/jedisct1/dlog)
## License
Copyright © 2016, 2018-2020 Hmgle
根据 [GPLv3 许可](https://www.gnu.org/licenses/gpl-3.0.html)发布。
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