TCP服务端和客户端程序示例

来源：互联网发布：et鼠标知乎编辑：程序博客网时间：2024/06/06 02:50

服务端：

#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <assert.h>#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <errno.h>#include <string.h>#define BUFFER_SIZE 1024int main( int argc, char* argv[] ){    if( argc <= 2)    {        printf( "usage: %s ip_address port_number \n", basename( argv[0] ) );        return 1;    }    const char* ip = argv[1];    int port = atoi( argv[2] );    int sock_fd, conn_fd;    int nbytes = 0;    char buf[BUFFER_SIZE];    struct sockaddr_in server_addr;        bzero( &server_addr, sizeof( server_addr ) );     server_addr.sin_family = AF_INET;    inet_pton( AF_INET, ip, &server_addr.sin_addr );    server_addr.sin_port = htons( port );        sock_fd = socket( PF_INET, SOCK_STREAM, 0 );    assert( sock_fd >= 0 );    int ret = bind( sock_fd, ( struct sockaddr* )&server_addr, sizeof( server_addr ) );    assert( ret != 1 );    ret = listen ( sock_fd, 5 );    assert( ret != -1 );    struct sockaddr_in client_addr;    socklen_t client_addrlength = sizeof( client_addr );    while( 1 )    {        memset ( buf, '\0', BUFFER_SIZE );        conn_fd = accept( sock_fd, ( struct sockaddr* )&client_addr, &client_addrlength );        if( conn_fd < 0 )        {            printf( "accept failed, errno is: %d\n", errno );            break;        }        printf( "Connect successed: %s\n", inet_ntoa( client_addr.sin_addr ) );        if( (nbytes = recv( conn_fd, buf, BUFFER_SIZE-1, 0 )) == -1 )        {            printf( "recv failed, errno is: %d\n", errno );            break;        }        printf( "Server received: %s\n", buf );        close( conn_fd );    }    close( sock_fd );    return 0;}

客户端：

#include <sys/socket.h>#include <arpa/inet.h>#include <assert.h>#include <stdio.h>#include <unistd.h>#include <string.h>#include <stdlib.h>#define BUFFER_SIZE 512int main( int argc, char* argv[] ){    if( argc <= 2 )    {        printf( "usage: %s ip_adderss port_number \n", basename( argv[0] ) );        return 1;    }    const char* ip = argv[1];    int port = atoi( argv[2] );    char buf[BUFFER_SIZE];    struct sockaddr_in server_addr;    bzero( &server_addr, sizeof( server_addr ) );    server_addr.sin_family = AF_INET;    inet_pton( AF_INET, ip, &server_addr.sin_addr );    server_addr.sin_port = htons( port );    int sock_fd = socket( PF_INET, SOCK_STREAM, 0 );    assert( sock_fd >= 0 );    if( connect( sock_fd, (struct sockaddr* )&server_addr, sizeof( server_addr ) ) == -1 )    {        printf("cannot connect the server: %s\n", inet_ntoa(server_addr.sin_addr) );        close( sock_fd );        return -1;    }    memset( buf, '\0', BUFFER_SIZE );    printf( "Please input message: \n" );    fgets(buf, BUFFER_SIZE, stdin);    send(sock_fd, buf, BUFFER_SIZE, 0 );    close( sock_fd );    return 0;}

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