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#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#include <sys/wait.h>

#include <unistd.h>

#include <arpa/inet.h>

#define MAXBUF 1024

int main(int argc, char *argv[])

{

    int pid;

    int sockfd, new_fd;

    socklen_t len;

    struct sockaddr_in my_addr,their_addr;

    unsigned int myport,lisum;

    char buf[MAXBUF+1];

    if(argv[2])

    {

        myport=atoi(argv[2]);

    }

    else

    {

        myport =7575;

    }

    if ( argv[3] )

    {

        lisum =atoi(argv[3]);

    }

    else

    {

        lisum = 5;

    }

    if ( (sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1 )

    {

        perror("socket");

        exit(EXIT_FAILURE);

    }

    bzero(&my_addr, sizeof(my_addr));

    my_addr.sin_family = AF_INET;

    my_addr.sin_port   = htons(myport);

    if(argv[1])

    {

        my_addr.sin_addr.s_addr = inet_addr(argv[1]);

    }

    else

    {

        my_addr.sin_addr.s_addr= INADDR_ANY;

    }

    if ( bind(sockfd, (struct sockaddr *)&my_addr,sizeof(struct sockaddr)) == -1 )

    {

        perror("bind");

        exit(EXIT_FAILURE);       

    }

    printf("wait for connect \n");

    len = sizeof(struct sockaddr);

    if ( (new_fd=accept(sockfd, (struct sockaddr*)&their_addr),&len)) == -1)

    {

        perror("accept");

        exit(EXIT_FAILURE);

    }

    else

    {

        printf("server :got connection  from :%s, port %d, socket %d\n",inet_ntoa(their_addr.sin_addr),ntohs(their_addr.sin_port),new_fd);

    }

        

    while ( 1 )

    {

        printf("newfd= %d\n",new_fd);

        bzero(buf, MAXBUF+1);

        printf("input the message to send :");

        fgets(buf, MAXBUF, stdin);

        if ( !strncasecmp(buf, "quit",4) )

        {

            printf("i will close the connect \n");

            break;

        }

        len = send(new_fd, buf, strlen(buf)-1,0);

        if ( len >0 )

        {

            printf("message :%s \t send sucessful ,send %d byte\n",buf,len);

        }

        else

        {

            printf("message : %s  send failure! errono code is %d merro msg is '%s' \n",buf,errno,strerror(errno));

            break;

        }

        bzero(buf, MAXBUF+1);

        len=recv(new_fd, buf, MAXBUF, 0);

        if ( len>0 )           

        {

            printf("message  recv successful : '%s'   %d byte recv \n",buf,len);

        }

        else

        {

            if ( len <0 )

            {

                printf("recv failure! errno code is %d, errno msg is '%s'\n",errno,strerror(errno));

            }

            else

            {

                printf("the other one close quit \n");

                break;

            }

        }

        close(new_fd);

        close(sock_fd);

        return 0;

    }

    

}