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Linux网络编程--聊天室客户端程序

發布時間：2024/8/23 linux 27 豆豆

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聊天室客戶端程序

#define _GNU_SOURCE 1 #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <assert.h> #include <stdio.h> #include <unistd.h> #include <string.h> #include <stdlib.h> #include <poll.h> #include <fcntl.h>#define BUFFER_SIZE 64int 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] );struct sockaddr_in server_address;bzero( &server_address, sizeof( server_address ) );server_address.sin_family = AF_INET;inet_pton( AF_INET, ip, &server_address.sin_addr );server_address.sin_port = htons( port );int sockfd = socket( PF_INET, SOCK_STREAM, 0 );assert( sockfd >= 0 );if ( connect( sockfd, ( struct sockaddr* )&server_address, sizeof( server_address ) ) < 0 ){printf( "connection failed\n" );close( sockfd );return 1;}struct pollfd fds[2];fds[0].fd = 0;fds[0].events = POLLIN;fds[0].revents = 0;fds[1].fd = sockfd;fds[1].events = POLLIN | POLLRDHUP;fds[1].revents = 0;char read_buf[BUFFER_SIZE];int pipefd[2];int ret = pipe( pipefd );assert( ret != -1 );while( 1 ){ret = poll( fds, 2, -1 );if( ret < 0 ){printf( "poll failure\n" );break;}if( fds[1].revents & POLLRDHUP ){printf( "server close the connection\n" );break;}else if( fds[1].revents & POLLIN ){memset( read_buf, '\0', BUFFER_SIZE );recv( fds[1].fd, read_buf, BUFFER_SIZE-1, 0 );printf( "%s\n", read_buf );}if( fds[0].revents & POLLIN ){ret = splice( 0, NULL, pipefd[1], NULL, 32768, SPLICE_F_MORE | SPLICE_F_MOVE );ret = splice( pipefd[0], NULL, sockfd, NULL, 32768, SPLICE_F_MORE | SPLICE_F_MOVE );}}close( sockfd );return 0; }

測試1

開啟服務端偵聽：nc -l ?6789 運行客戶端程序：./a.out ?127.0.0.1 ?6789 [fes@fes ~]$ nc -l 6789 Hello World Hi Boy hi gils[fes@fes test]$ ./a.out 127.0.0.1 6789 Hello World Hi Boy hi gils

測試2

[fes@fes test]$ ./a.out 202.108.22.5 80 GET / HTTP/1.0HTTP/1.1 200 OK Date: Tue, 28 Oct 2014 08:42:21 GMT Content-Type: text/html Content-Length: 14613 Last-Modified: Wed, 03 Sep 2014 02:48:32 GMT Connection: Close Vary: Accept-Encoding Set-Cookie: BAIDUID=BB394409C2863298A47B3D23F81817CC:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com Set-Cookie: BAIDUPSID=BB394409C2863298A47B3D23F81817CC; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com Set-Cookie: BDSVRTM=0; path=/ P3P: CP=" OTI DSP COR IVA OUR IND COM " Server: BWS/1.1 Pragma: no-cache Cache-control: no-cache BDPAGETYPE: 1 BDQID: 0xac1b0f5500017ba2 BDUSERID: 0 Accept-Ranges: bytes<!DOCTYPE html> <html> <head><meta http-equiv="content-type" content="text/html;charset=utf-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><link rel="dns-prefetch" href="//s1.bdstatic.com"/><link rel="dns-prefetch" href="//t1.baidu.com"/><link rel="dns-prefetch" href="//t2.baidu.com"/><link rel="dns-prefetch" href="//t3.baidu.com"/><link rel="dns-prefetch" href="//t10.baidu.com"/><link rel="dns-prefetch" href="//t11.baidu.com"/><link rel="dns-prefetch" href="//t12.baidu.com"/><link rel="dns-prefetch" href="//b1.bdstatic.com"/>......
客戶端連接百度,實現HTTP測試

程序收獲

1、poll函數在IO復用中的應用 2、splice函數高效復制 3、nc命令在網絡中的應用

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