免流常见原理

1、修改HTTP连接header:
这里需要了解运营商如何分辨手机走的流量是否为免流流量,目前采用的多是检查HTTP header,查看是否是指定的Host、UA等,具体免流方法为将手机流量中,每一个HTTP请求中,均加入能够免流的Host、UA、或者其他一些免流参数即可.

2、指定端口免流:
这个是比较早期的免流方法,目前在大多数地区均不可用,原理为使用ss、***等工具,通过指定的端口,如137/138/139等端口,即可免流.

注：此方法中使用的免流代码已失效

实战

1、找到一款能够免流量费用的软件(直接使用即可免流量或者开通指定套餐免流量均可),或者网址.
我这里找到的是咪咕音乐
介绍中写了有免流量,实际测试发现确实是免流量的.

2、抓取数据包,打开咪咕音乐,播放音乐,使用wi.cap进行抓包,结果如图所示.

可以看到有Host、Accept、User-Agent、Connection、imei、imsi等header.

3、使用可以手工构造HTTP header的,类似于HTTP/HTTPS协议的***软件,如open***、***等,这里我使用的是***.
搭建***服务器,搭建时注意ss服务器端口和咪咕音乐服务器端口一致,这里是80端口,协议选择auth_sha1,混淆方式使用http_simple.
这里我使用了一段网上搭建***的脚本,可以直接wget http://***.ximcx.cn/×××/××× & bash ×××使用.
脚本内容为

#! /bin/bash
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH
#=================================================================#
#   System Required:  CentOS 6,7, Debian, Ubuntu                   #
#   Description: One click Install ShadowsocksR Server              #
#   Author: 91yun                                                              #
#   Thanks: @breakwa11 <https://twitter.com/breakwa11>       #
#   Thanks: @Teddysun <i@teddysun.com>                            #
#   Intro:  https://shadowsocks.be/9.html                              #
#=================================================================#
rm -f ×××
clear
yum -y install git
echo -e "\033[34m================================================================\033[0m\033[31m                欢迎使用×××免流Or×××一键脚本                         \033[0m\033[31m         妖火网论坛：http://yaohuo.me，I'M 西门吹雪             \033[0m\033[31m           即将开始搭建...   非妖火论坛妖友使用死全家                  \033[0m
\033[34m================================================================\033[0m";
echoecho#Current folder
cur_dir=`pwd`
# Get public IP address
IP=$(ip addr | egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | egrep -v "^192\.168|^172\.1[6-9]\.|^172\.2[0-9]\.|^172\.3[0-2]\.|^10\.|^127\.|^255\.|^0\." | head -n 1)
if [[ "$IP" = "" ]]; thenIP=$(wget -qO- -t1 -T2 ipv4.icanhazip.com)
fi# Make sure only root can run our script
function rootness(){if [[ $EUID -ne 0 ]]; thenecho "Error:This script must be run as root!" 1>&2exit 1fi
}# Check OS
function checkos(){if [ -f /etc/redhat-release ];thenOS='CentOS'elif [ ! -z "`cat /etc/issue | grep bian`" ];thenOS='Debian'elif [ ! -z "`cat /etc/issue | grep Ubuntu`" ];thenOS='Ubuntu'elseecho "Not support OS, Please reinstall OS and retry!"exit 1fi
}# Get version
function getversion(){if [[ -s /etc/redhat-release ]];thengrep -oE  "[0-9.]+" /etc/redhat-releaseelse    grep -oE  "[0-9.]+" /etc/issuefi
}# CentOS version
function centosversion(){local code=$1local version="`getversion`"local main_ver=${version%%.*}if [ $main_ver == $code ];thenreturn 0elsereturn 1fi
}# Disable selinux
function disable_selinux(){
if [ -s /etc/selinux/config ] && grep 'SELINUX=enforcing' /etc/selinux/config; thensed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/configsetenforce 0
fi
}# Pre-installation settings
function pre_install(){# Not support CentOS 5if centosversion 5; thenecho "Not support CentOS 5, please change OS to CentOS 6+/Debian 7+/Ubuntu 12+ and retry."exit 1fi# Set ShadowsocksR config passwordecho "请输入×××连接密码:"read -p "(默认密码: yaohuo520):" shadowsockspwd[ -z "$shadowsockspwd" ] && shadowsockspwd="yaohuo520"echoecho "---------------------------"echo "password = $shadowsockspwd"echo "---------------------------"echo# Set ShadowsocksR config portwhile truedoecho -e "请输入×××连接端口,不设置将默认138端口:"read -p "(默认自动设置SS免流端口为138):" shadowsocksport[ -z "$shadowsocksport" ] && shadowsocksport="138"expr $shadowsocksport + 0 &>/dev/nullif [ $? -eq 0 ]; thenif [ $shadowsocksport -ge 1 ] && [ $shadowsocksport -le 65535 ]; thenechoecho "---------------------------"echo "port = $shadowsocksport"echo "---------------------------"echobreakelseecho "输入错误，请输入1-65535之间的数字！"fielseecho "输入错误，请输入1-65535之间的数字！"fidoneget_char(){SAVEDSTTY=`stty -g`stty -echostty cbreakdd if=/dev/tty bs=1 count=1 2> /dev/nullstty -rawstty echostty $SAVEDSTTY}echoecho "Press any key to start...or Press Ctrl+C to cancel"char=`get_char`# Install necessary dependenciesif [ "$OS" == 'CentOS' ]; thenyum install -y wget unzip openssl-devel gcc swig python python-devel python-setuptools autoconf libtool libevent git ntpdateyum install -y m2crypto automake make curl curl-devel zlib-devel perl perl-devel cpio expat-devel gettext-develelseapt-get -y updateapt-get -y install python python-dev python-pip python-m2crypto curl wget unzip gcc swig automake make perl cpio build-essential git ntpdateficd $cur_dir
}# Download files
function download_files(){# Download libsodium fileif ! wget --no-check-certificate -O libsodium-1.0.10.tar.gz https://github.com/jedisct1/libsodium/releases/download/1.0.10/libsodium-1.0.10.tar.gz; thenecho "Failed to download libsodium file!"exit 1fi# Download ShadowsocksR file# if ! wget --no-check-certificate -O manyuser.zip https://github.com/breakwa11/shadowsocks/archive/manyuser.zip; then# echo "Failed to download ShadowsocksR file!"# exit 1# fi# Download ShadowsocksR chkconfig fileif [ "$OS" == 'CentOS' ]; thenif ! wget --no-check-certificate https://raw.githubusercontent.com/91yun/shadowsocks_install/master/shadowsocksR -O /etc/init.d/shadowsocks; thenecho "Failed to download ShadowsocksR chkconfig file!"exit 1fielseif ! wget --no-check-certificate https://raw.githubusercontent.com/91yun/shadowsocks_install/master/shadowsocksR-debian -O /etc/init.d/shadowsocks; thenecho "Failed to download ShadowsocksR chkconfig file!"exit 1fifi
}# firewall set
function firewall_set(){echo "firewall set start..."if centosversion 6; then/etc/init.d/iptables status > /dev/null 2>&1if [ $? -eq 0 ]; theniptables -L -n | grep '${shadowsocksport}' | grep 'ACCEPT' > /dev/null 2>&1if [ $? -ne 0 ]; theniptables -I INPUT -m state --state NEW -m tcp -p tcp --dport ${shadowsocksport} -j ACCEPTiptables -I INPUT -m state --state NEW -m udp -p udp --dport ${shadowsocksport} -j ACCEPT/etc/init.d/iptables save/etc/init.d/iptables restartelseecho "port ${shadowsocksport} has been set up."fielseecho "WARNING: iptables looks like shutdown or not installed, please manually set it if necessary."fielif centosversion 7; thensystemctl status firewalld > /dev/null 2>&1if [ $? -eq 0 ];thenfirewall-cmd --permanent --zone=public --add-port=${shadowsocksport}/tcpfirewall-cmd --permanent --zone=public --add-port=${shadowsocksport}/udpfirewall-cmd --reloadelseecho "Firewalld looks like not running, try to start..."systemctl start firewalldif [ $? -eq 0 ];thenfirewall-cmd --permanent --zone=public --add-port=${shadowsocksport}/tcpfirewall-cmd --permanent --zone=public --add-port=${shadowsocksport}/udpfirewall-cmd --reloadelseecho "WARNING: Try to start firewalld failed. please enable port ${shadowsocksport} manually if necessary."fififiecho "firewall set completed..."
}# Config ShadowsocksR
function config_shadowsocks(){cat > /etc/shadowsocks.json<<-EOF
{"server": "0.0.0.0","server_ipv6": "::","server_port": ${shadowsocksport},"local_address": "127.0.0.1","local_port": 1081,"password": "${shadowsockspwd}","timeout": 120,"udp_timeout": 60,"method": "chacha20","protocol": "auth_sha1_compatible","protocol_param": "","obfs": "http_simple_compatible","obfs_param": "","dns_ipv6": false,"connect_verbose_info": 0,"redirect": "","fast_open": false,"workers": 1}
EOF
}# Install ShadowsocksR
function install_ss(){# Install libsodiumtar zxf libsodium-1.0.10.tar.gzcd $cur_dir/libsodium-1.0.10./configure && make && make installecho "/usr/local/lib" > /etc/ld.so.conf.d/local.confldconfig# Install ShadowsocksRcd $cur_dir# unzip -q manyuser.zip# mv shadowsocks-manyuser/shadowsocks /usr/local/git clone -b manyuser https://github.com/breakwa11/shadowsocks.git /usr/local/shadowsocksif [ -f /usr/local/shadowsocks/server.py ]; thenchmod +x /etc/init.d/shadowsocks# Add run on system start upif [ "$OS" == 'CentOS' ]; thenchkconfig --add shadowsockschkconfig shadowsocks onelseupdate-rc.d -f shadowsocks defaultsfi# Run ShadowsocksR in the background/etc/init.d/shadowsocks startclearechoecho "恭喜你，shadowsocksr安装完成！"echo -e "服务器IP: \033[41;37m ${IP} \033[0m"echo -e "远程连接端口: \033[41;37m ${shadowsocksport} \033[0m"echo -e "远程连接密码: \033[41;37m ${shadowsockspwd} \033[0m"echo -e "本地监听IP: \033[41;37m 127.0.0.1 \033[0m"echo -e "本地监听端口: \033[41;37m 1080 \033[0m"echo -e "认证方式: \033[41;37m auth_sha1 \033[0m"echo -e "协议: \033[41;37m http_simple \033[0m"echo -e "加密方式: \033[41;37m chacha20 \033[0m"echoecho "欢迎来访妖火论坛:http://yaohuo.me Or https://yaohw.com"echo "如果你想改变认证方式和协议，请参考网址"echo "https://github.com/breakwa11/shadowsocks-rss/wiki/Server-Setup"echoecho "安装完毕！去享受这种愉悦感把！I'm your old friend 西门吹雪"echoelseecho "Shadowsocks安装失败!"install_cleanupexit 1fi
}#改成北京时间
function check_datetime(){rm -rf /etc/localtimeln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtimentpdate 1.cn.pool.ntp.org
}# Install cleanup
function install_cleanup(){cd $cur_dirrm -f manyuser.ziprm -rf shadowsocks-manyuserrm -f libsodium-1.0.10.tar.gzrm -rf libsodium-1.0.10
}# Uninstall ShadowsocksR
function uninstall_shadowsocks(){printf "你确定卸载shadowsocksr？ (y/n) "printf "\n"read -p "(Default: n):" answerif [ -z $answer ]; thenanswer="n"fiif [ "$answer" = "y" ]; then/etc/init.d/shadowsocks status > /dev/null 2>&1if [ $? -eq 0 ]; then/etc/init.d/shadowsocks stopficheckosif [ "$OS" == 'CentOS' ]; thenchkconfig --del shadowsockselseupdate-rc.d -f shadowsocks removefirm -f /etc/shadowsocks.jsonrm -f /etc/init.d/shadowsocksrm -rf /usr/local/shadowsocksecho "ShadowsocksR uninstall success!"elseecho "uninstall cancelled, Nothing to do"fi
}# Install ShadowsocksR
function install_shadowsocks(){checkosrootnessdisable_selinuxpre_installdownload_filesconfig_shadowsocksinstall_ssif [ "$OS" == 'CentOS' ]; thenfirewall_set > /dev/null 2>&1ficheck_datetimeinstall_cleanup}# Initialization step
action=$1
[ -z $1 ] && action=install
case "$action" in
install)install_shadowsocks;;
uninstall)uninstall_shadowsocks;;
*)echo "Arguments error! [${action} ]"echo "Usage: `basename $0` {install|uninstall}";;
esac

4、搭建好后在手机端进行设置.
如图:

使用的混淆代码如下

freetyst.mll.migu.cn\r\nAccept: */*\r\nUser-Agent: migumusic\r\nConnection: close\r\nimei: 000000000000000000\r\nimsi: 00000000000000000000

使用open***的话，免流代码如下

http-proxy-option EXT1 "GET http://migumovie.lovev.com"
http-proxy-option EXT1 "Host: freetyst.mll.migu.cn"
http-proxy-option EXT1 "Accept: */*"
http-proxy-option EXT1 "User-Agent: migumusic"
http-proxy-option EXT1 "Connection: close"
http-proxy 10.0.0.172 80

最后的10.0.0.172 80是移动的HTTP代理服务器,也可以自己搭建HTTP代理服务器,然后修改10.0.0.172为自己的代理服务器

5、手机上开启ss，抓包查看

总结

这里免流的核心其实就是找到一个移动运营商允许的可以免流量使用的软件
而手机流量通过移动运行商时,移动运行商会检查数据包中有没有不收取流量的数据包
检查方法基本是使用的HTTP header中的关键字
因此,只需要找到检测的关键字,把手机上发出的每一个数据包都带上这个关键字,就可以免流了
同理,如果需要手机开热点出来给电脑用,也是一样的,只要发出的数据包带有这个关键字,就能免流
以上方法为HTTP协议的免流,如果发现某个软件使用的tcp等协议,也可以分析包里的特征,实现免流
如果使用的免流服务器为国外的服务器，当流量太大时,可能会被gfw干掉,另外据说有人使用国外服务器免流,被运营商发现过,真伪未知