ssh根据ip选择hostname

想在ssh中，让一个host通过不同的hostname连接：

• 在学校网段，则通过教育网ip连接
• 否则，通过tunnel连接

方案：Match关键字。

Match originalhost example-host exec "python checkipthu.py"
  HostName 203.0.113.1
  Port 22
  User your-username
 
Host example-host
  # use tunnel
  HostName 192.0.2.1
  User your-username
  Port 12345

注意两个设置的先后顺序，会先尝试match前面的。

checkipthu.py是一个判断ip网段的python脚本：

import requests
import ipaddress
 
# 清华的网段列表
tsinghua_networks = [
    "166.111.0.0/16",
    "101.5.0.0/16",
    "101.6.0.0/16",
    "59.66.0.0/16",
    "183.172.0.0/16",
    "183.173.0.0/16",
    "118.229.0.0/20"
]
 
# 获取当前IPv4地址
def get_public_ip():
    try:
        response = requests.get('https://ipv4.icanhazip.com', timeout=5)
        response.raise_for_status()
        return response.text.strip()
    except requests.RequestException as e:
        print(f"Error fetching IP address: {e}")
        return None
 
# 判断IP是否在清华的网段内
def is_in_tsinghua_network(ip):
    ip_address = ipaddress.ip_address(ip)
    for network in tsinghua_networks:
        if ip_address in ipaddress.ip_network(network):
            return True
    return False
 
# 主函数
def main():
    ip = get_public_ip()
    if ip is None:
        print("Failed to get IP.")
        exit(-1)
 
    if is_in_tsinghua_network(ip):
        print(f"IP {ip} is in Tsinghua network.")
        exit(0)
    else:
        print(f"IP {ip} is NOT in Tsinghua network.")
        exit(1)
 
if __name__ == "__main__":
    main()