/*************************************************************************
  > File Name: udpserver.cpp
  > Author: TianLun Song
  > Mail: songtianlun@frytea.com
  > Blog: https://blog.frytea.com
  > Created Time: Wed 13 Jan 2021 09:53:06 AM CST
 ************************************************************************/
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <sys/un.h>
#include <iostream>
#include <unistd.h>

using namespace std;


char* server_file = "server.sock";

int main(int argc,char** argv)
{
    int fd = socket(AF_UNIX,SOCK_DGRAM,0);

    if (fd < 0)
    {
        perror("socket");
        return -1;
    }


    struct sockaddr_un addr;
    memset(&addr,0,sizeof(addr));
    addr.sun_family = AF_UNIX;
    strcpy(addr.sun_path,server_file);

    if (access(addr.sun_path,0) != -1)
    {
        remove(addr.sun_path);
    }

    if(bind(fd,(sockaddr*)&addr,sizeof(addr)) < 0)
    {
        perror("bind");
        return -1;
    }


    struct sockaddr_un clientaddr;
    socklen_t len = sizeof(clientaddr);

    char msgrecv[1024];

    

    while (1)
    {
        memset(msgrecv,'\0',1024);
        int size = recvfrom(fd,msgrecv,sizeof(msgrecv),0,(sockaddr*)&clientaddr,&len);
        if (size < 0)
        {
            perror("recv");
            return -1;
        }


        cout << "I'm server,receive a msg: " << msgrecv  << " from: " << clientaddr.sun_path << endl;

        if (strncmp("quit",msgrecv,4) == 0)
        {
            cout << "Server is exiting!" << endl;
            break;
        }

        char *p = "OK,I got id!";
        int ssize = sendto(fd,p,strlen(p),0,(sockaddr*)&clientaddr,len);
        if (ssize < 0)
        {
            perror("sendto");
            return -1;
        }

        sleep(1);
    }


    if (close(fd) < 0)
    {
        perror("close");
        return -1;
    }

    return 0;
    
}