Server Develop （一） 简单的TCP/IP C/S

//server.h

#include "utl.h"

class server{
public:
    server(const short port);
    ~server();

    int initServer();

    void startListen(); //循环accept，可以通过继承来增加多线程

private:
    struct sockaddr_in server_addr;
    int sock_serv;
};

//server.cc

#include "server.h"
#include "utl.h"

server::server( const short port)
{
    memset( &server_addr, 0, sizeof(server_addr) );

    server_addr.sin_family = AF_INET;
    server_addr.sin_port   = htons(port);
    server_addr.sin_addr.s_addr = htonl( INADDR_ANY );
}

server::~server()
{
    close(sock_serv);
}

int server::initServer()
{
    sock_serv = socket(AF_INET, SOCK_STREAM, 0);
    if(sock_serv < 0){
        perror("socket error!\n");
        return -1;
    }

    int on = 1;
    setsockopt( sock_serv, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on) );

    int flag = bind(sock_serv, (struct sockaddr*)&server_addr, sizeof(server_addr));
    if(flag < 0){
        perror("bind error!\n");
        close(sock_serv);
        return -1;
    }

    return 0;
}

void server::startListen()
{
    int flag = listen(sock_serv, 5);
    if(flag < 0){
        perror("listen error!\n");
        close(sock_serv);
        return;
    }

    char buffer[1024];

    while(1){

        bzero(buffer,sizeof(buffer));

        struct sockaddr_in client_addr;
        int size = sizeof(client_addr);
        int sock_client = accept(sock_serv, (struct sockaddr*)(&client_addr), (unsigned int*)(&size));
        if(sock_client < 0){
            perror("accept error!\n");
            continue;
        }

        strcpy(buffer, "this is server! welcome!\n");
        send(sock_client, buffer, 1024, 0);

        bzero(buffer,sizeof(buffer));
        flag = recv(sock_client, buffer, 1024, 0);
        if(flag < 0){
            perror("recv error!\n");
            close(sock_serv);
            return;
        }
        printf("recv : %s\n",buffer);

        while(1){
            bzero(buffer,sizeof(buffer));
            flag = recv(sock_client, buffer, 1024, 0);
            if(flag < 0){
                perror("recv error!\n");
                close(sock_serv);
                return;
            }
            printf("i have recv buffer\n");
            printf("recv : %s\n",buffer);
            if(strcmp(buffer,"quit") == 0){
                printf("quit!!!\n");
                break;
            }
        }
    }
}

//client.cc
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <unistd.h>
#include <iostream>
using namespace std;


int main(int argc, char** argv)
{
    int sock_client;
    struct sockaddr_in server_addr;

    sock_client = socket(AF_INET, SOCK_STREAM, 0);
    if(sock_client < 0 ){
        perror("socket error!\n");
        return -1;
    }

    bzero(&server_addr, sizeof(struct sockaddr_in));
    server_addr.sin_family         = AF_INET;
    server_addr.sin_port           = htons(8000);
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

    int flag;
    flag = connect(sock_client,(struct sockaddr*)(&server_addr), sizeof(struct sockaddr));
    if(flag < 0){
        perror("connect error!\n");
        close(sock_client);
        return -1;
    }

    printf("connect to server : OK! \n");

    char buffer[1024];


    //printf("%s\n",buffer);

    bzero(buffer,sizeof(buffer));
    recv(sock_client, buffer, 1024, 0);
    printf("recv : %s\n", buffer);

    bzero(buffer,sizeof(buffer));
    strcpy(buffer,"this is client!\n");
    send(sock_client, buffer, 1024, 0);

    while(1){
        bzero(buffer,sizeof(buffer));
        cin>>buffer;
        int p = strlen(buffer);
        buffer[p] = '\0';
        send(sock_client, buffer, 1024, 0);
        printf("i have send buffer\n");
    }


    close(sock_client);
    return 0;
}