//server
#include<stdio.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<string.h>
#include<unistd.h>
#include <arpa/inet.h>
#include<pthread.h>

static void usage(const char *proc)
{
    printf("Please use :%s [IP] [port]\n",proc);
}

void thread_run(void *arg)
{
    printf("creat a new thread\n");
    int fd = (int)arg;
    char buf[1024];

    while(1){
        memset(buf,‘\0‘,sizeof(buf));
        ssize_t _s = read(fd,buf,sizeof(buf) - 1);
        if(_s > 0){
            buf[_s] = ‘\0‘;
            printf("client say : %s\n",buf);
        }    
        memset(buf,‘\0‘,sizeof(buf));
        printf("please Enter: ");
        fflush(stdout);
        ssize_t _s2 = read(0,buf,sizeof(buf) - 1);
        if(_s2 > 0){
            write(fd,buf,strlen(buf));
        }
    }
}

int main(int argc,char *argv[])
{
    if(argc != 3){
        usage(argv[0]);
        exit(1);
    }

    //1.creat socket
    int sock = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
    if(sock < 0){
        perror("creat socket error\n");
        return 1;
    }

    struct sockaddr_in local;
    local.sin_family = AF_INET;
    local.sin_port = htons(atoi(argv[2]));
    local.sin_addr.s_addr = inet_addr(argv[1]);

    //2.bind

    if(bind(sock,(struct sockaddr*)&local,sizeof(local)) < 0){
        perror("bind error\n");
        close(sock);
        return 2;
    }
   
    //3.listen

    if(listen(sock,10) < 0){
        perror("listen error\n");
        close(sock);
        return 3;
    }

    printf("bind and listen success!wait accept...\n");
    
    //4.accept

    struct sockaddr_in peer;
    socklen_t len = sizeof(peer);
    while(1){

        int fd = accept(sock,(struct sockaddr*)&peer ,&len);

        if(fd < 0){
            perror("accept error\n");
            close(sock);
            return 4;
        }
        
        printf("get connect,ip is : %s port is : %d\n",inet_ntoa(peer.sin_addr),ntohs(peer.sin_port));

        pthread_t id;
        pthread_create(&id,NULL,thread_run,(void*)fd);

        pthread_detach(id);

    }
    close(sock);
    return 0;
}

//client
#include<stdio.h>
#include<unistd.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<string.h>
#include<errno.h>
#include<netinet/in.h>
#include<arpa/inet.h>

static void usage(const char *proc)
{
    printf("please use : %s [ip] [port]\n",proc);
}
int main(int argc,char *argv[])
{
    if( argc != 3 ){
        usage(argv[0]);
        exit(1);
    }
    
    int sock = socket(AF_INET,SOCK_STREAM,0);
    if(sock < 0){
        perror("socket error");
        return 1;
    }

    struct sockaddr_in remote;
    remote.sin_family = AF_INET;
    remote.sin_port = htons(atoi(argv[2]));
    remote.sin_addr.s_addr = inet_addr(argv[1]);


    int ret = connect(sock,(struct sockaddr*)&remote,sizeof(remote));
    if(ret < 0){
        printf("connect failed:%s\n",strerror(errno));
        return 2;
    }
    
    printf("connect success!\n");

    char buf[1024];
    while(1){
        memset(buf,‘\0‘,sizeof(buf));
        printf("please enter:");
        fflush(stdout);
        ssize_t _s = read(0,buf,sizeof(buf)-1);
        if(_s > 0){
            buf[_s - 1] = ‘\0‘;
            write(sock,buf,strlen(buf));
            _s = read(sock,buf,sizeof(buf)-1);
            if(_s > 0){
                if(strncasecmp(buf,"quit",4) == 0){
                     printf("qiut\n");
                     break;
                 }
                buf[_s -1] = ‘\0‘;
                printf("%s\n",buf);
            }
        }
    }
    close(sock);
    return 0;
}