#!/bin/bash

function read_variable() {
    readonly install_path=/usr/local/zabbix-7.0.1
    readonly url="https://cdn.zabbix.com/zabbix/sources/stable/7.0/zabbix-7.0.1.tar.gz"
    readonly service_name="zabbix_agentd"
}

function build_variable() {
    read_variable
    which wget 2>/dev/null
    if [ $? -ne 0 ]; then
        yum install wget -y
    fi
    [ -f /etc/init.d/${service_name} ] && echo "Service /etc/init.d/${service_name} Exist! Exit!" && exit
    [ -d $install_path ] && echo "Path ${install_path} Exist! Exit" && exit
    readonly package=$(echo $url | awk -F'/' '{print $NF}')
    readonly zip_dir=$(echo $package | sed 's/.tar.gz//g')
    if [ ! -f $package ]; then
        wget $url --no-check-certificate
    fi
    [ ! -f $package ] && echo "$package not found" && exit

    [ -d $zip_dir ] && echo "$zip_dir Exsist! Exit!" && exit
}

function help1() {
    echo -e "\033[01m"
    echo
    echo "$0 install"
    echo
    echo -e "\033[0m"
}

function rewrite_conf() {
    mkdir -p ${install_path}/etc/
    [ -f ${install_path}/etc/zabbix_agentd.conf ] && mv ${install_path}/etc/zabbix_agentd.conf ${install_path}/etc/zabbix_agentd.conf.bak
    cat <<EOF >${install_path}/etc/zabbix_agentd.conf
PidFile=${install_path}/zabbix_agentd.pid
LogType=file
LogFile=${install_path}/zabbix_agentd.log

# 被动模式的服务器地址
Server=192.168.0.200
ListenPort=10050

# 监听的IP, 可填多个, 第一个IP用于自动注册
ListenIP=0.0.0.0

# 主动模式的服务器地址
ServerActive=192.168.0.200

# 主机名
Hostname=localhost

# 主机元数据
HostMetadata=Linux LiLin
User=zabbix
Include=${install_path}/etc/zabbix_agentd.conf.d/*.conf

##################################################################

## 主动模式的链接方式 # unencrypted psk cert
#TLSConnect=unencrypted                                 

## 被动模式的链接方式 # unencrypted psk cert
#TLSAccept=cert                                          

## CA证书
#TLSCAFile=/root/SSL/CA/ca.pem                           

## 客户端证书, 必须为对等证书
#TLSCertFile=/root/SSL/zabbix_agentd/zabbix_agent.pem    

## 客户端私钥, 必须是对等证书
#TLSKeyFile=/root/SSL/zabbix_agentd/zabbix_agent-key.pem 

###################################################################

EOF
}

function create_services() {
    cat <<EOF >/etc/init.d/${service_name}
#!/bin/bash
function read_variable() {
    readonly home_path="/usr/local/zabbix-7.0.1"
}

function build_variable() {
    read_variable
    readonly pid_file=\${home_path}/zabbix_agentd.pid
    readonly log_file=\${home_path}/zabbix_agentd.log
    readonly conf_path=\${home_path}/etc/zabbix_agentd.conf
    readonly sbin_path=\${home_path}/sbin/zabbix_agentd
    [ ! -d \$home_path ] && echo "path not found" && exit
    [ ! -f \$conf_path ] && echo "conf not found" && exit
    [ ! -f \$sbin_path ] && echo "sbin not found" && exit
    cd \$home_path
}

function edit_server() {
    build_variable
    vim \$conf_path
}

function start_server() {
    build_variable
    echo "" >\$log_file
    \$sbin_path -c \$conf_path
    tail -f \$log_file
}

function stop_server() {
    build_variable
    echo \$pid_file
    [ ! -f \$pid_file ] && echo "pid not found" && exit
    cat \$pid_file | xargs kill
}

function restart_server() {
    stop_server
    start_server 2>/dev/null
}

case \$1 in
"start")
    start_server
    ;;
"stop")
    stop_server
    ;;
"restart")
    restart_server
    ;;
"edit")
    edit_server
    ;;
*)
    echo "\$0 start|stop|restart"
    ;;
esac
EOF
}

function install_zabbix() {
    build_variable
    openssl version
    if [ $? -ne 0 ]; then
        yum install openssl-devel -y
    fi
    tar xf $package
    cd $zip_dir
    ./configure --enable-agent -prefix=$install_path --with-openssl
    make && make install
    id zabbix
    [ $? -ne 0 ] && useradd -s /sbin/nologin zabbix
    touch $install_path\/zabbix_agentd.log
    chown -R zabbix:zabbix $install_path
    rewrite_conf    # 重写配置文件
    create_services # 创建服务脚本
    echo
    echo "install_success"
    echo
    chmod +x /etc/init.d/${service_name}
    /etc/init.d/${service_name}
    /etc/init.d/${service_name}
    echo "use command edit conf: /etc/init.d/${service_name} edit"
}

case $1 in
"install")
    install_zabbix
    ;;
*)
    help1
    ;;
esac