import socket
import time

def send_sip_message():
    # 配置参数
    target_ip = "192.168.3.3"    # 设备eth1的IP（转发入口）
    target_port = 5060           # 转发端口
    mac_local_ip = "192.168.3.33"# Mac的本地IP（与Via头部一致）
    sender_sip = "3011302"       # 发送方SIP用户
    sender_ip = "192.168.9.57"   # 设备eth0的IP（转发后源IP）
    receiver_sip = "3019901"     # 接收方SIP用户
    receiver_ip = "192.168.9.4"  # 目标IP

    # 生成唯一标识
    call_id = f"{int(time.time())}"  # 基于时间戳的Call-ID
    tag = f"{int(time.time() % 1000000)}"  # 随机tag
    branch = f"z9hG4bK{int(time.time())}"  # Via分支标识

    # XML消息体（业务数据）
    xml_body = '''<?xml version="1.0" encoding="UTF-8" ?>
<params>
	<to>sip:{receiver_sip}@{receiver_ip}:5060</to>
	<elev>1</elev>
	<direct>2</direct>
	<floor>13</floor>
	<family>2</family>
	<app>elev</app>
	<event>appoint</event>
	<event_url>/elev/appoint</event_url>
</params>'''.format(receiver_sip=receiver_sip, receiver_ip=receiver_ip)

    # 计算消息体长度（字节数）
    content_length = len(xml_body.encode('utf-8'))

    # 构造SIP MESSAGE请求（严格使用\r\n换行）
    sip_message = f'''MESSAGE sip:{receiver_sip}@{receiver_ip}:5060 SIP/2.0
Via: SIP/2.0/UDP {mac_local_ip}:5060;rport;branch={branch}
From: <sip:{sender_sip}@{sender_ip}:5060>;tag={tag}
To: <sip:{receiver_sip}@{receiver_ip}:5060>
Call-ID: {call_id}@{mac_local_ip}
CSeq: 20 MESSAGE
Content-Type: text/plain
Max-Forwards: 70
User-Agent: DnakeVoip v1.0
Content-Length: {content_length}

{xml_body}'''

    # 替换换行符为\r\n（确保符合SIP协议）
    sip_message = sip_message.replace('\n', '\r\n')

    try:
        # 创建UDP socket并发送消息
        with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as sock:
            # 设置超时时间（5秒）
            sock.settimeout(5)
            # 发送消息
            sock.sendto(sip_message.encode('utf-8'), (target_ip, target_port))
            print(f"已发送SIP消息到 {target_ip}:{target_port}")
            print("\n发送的消息内容：")
            print(sip_message)

            # 尝试接收响应（可选）
            try:
                response, addr = sock.recvfrom(4096)
                print(f"\n收到来自 {addr} 的响应：")
                print(response.decode('utf-8', errors='ignore'))
            except socket.timeout:
                print("\n未收到响应（可能对方未回复或网络延迟）")

    except Exception as e:
        print(f"发送失败：{str(e)}")

if __name__ == "__main__":
    send_sip_message()