linux下TCP连接的client和server 【转载】
linux下TCP连接的client和server
http://blog.163.com/caipeipei_love@126/blog/static/2596603220101118433940/
基于TCP连接的client和server简单通信
我在看电子书，班主任来了说动手写个client和server的简单通信，只看是不行的，写好了给我看看，真的是一语点中了真理啊：只看不动手，什么时候都不会掌握的！
下午自己就动手写了一个：
主要是基于TCP的三次握手的，面向连接的client和server
tcpserver.c
#include<stdlib.h> #include<stdio.h> #include<errno.h> #include<string.h> #include<netdb.h> #include<sys/types.h> #include<netinet/in.h> #include<sys/socket.h> #include<unistd.h> #include<arpa/inet.h> #define portnumber 8080 int main(int argc ,char *argv[]) { int sockfd,new_fd; struct sockaddr_in server_addr; struct sockaddr_in client_addr; int sin_size,iDataNum; // const char hello[]="Hello cpp, you are success.\n"; char buffer[4096];</span><span style="color: #0000ff;">if</span>(argc!=<span style="color: #800080;">2</span><span style="color: #000000;">) { fprintf(stderr,</span><span style="color: #800000;">"</span><span style="color: #800000;">Usage:%s portnumber\a\n</span><span style="color: #800000;">"</span>,argv[<span style="color: #800080;">0</span><span style="color: #000000;">]); </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">; }// if((portnumber=atoi(argv[1]))<0)
// {
// fprintf(stderr,"Usage:%s portnumber\a\n",argv[0]);
// return 0;
// }
if((sockfd=socket(AF_INET,SOCK_STREAM,0))-1)
{
fprintf(stderr,"Socket error:%s\n\a",strerror(errno));
return 0;
}
bzero(&server_addr,sizeof(struct sockaddr_in));
server_addr.sin_family=AF_INET;
server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
server_addr.sin_port=htons(portnumber);
if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))-1)
{
fprintf(stderr,"Bind error:%s\n\a",strerror(errno));
return 0;
}
if(listen(sockfd,5)-1)
{
fprintf(stderr,"Listen error:%s\n\a",strerror(errno));
return 0;
}
while(1)
{
sin_size=sizeof(struct sockaddr_in);
if((new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size))-1)
{
fprintf(stderr,"Accept error:%s\n\a",strerror(errno));
return 0;
}
fprintf(stdout,"Server get connection from %s\n",inet_ntoa(client_addr.sin_addr));
iDataNum=recv(new_fd,buffer,4096,0);
if(iDataNum<0)
{
perror("Recv\n");
exit(1);
}
printf("Recv data is %s\n",buffer);
send(new_fd,buffer,sizeof(buffer),0);
// if(write(new_fd,hello,strlen(hello))==-1)
// {
// fprintf(stderr,"write error:%s\n",strerror(errno));
// return 0;
// }
close(new_fd);} close(sockfd);// exit(0);
return 0;
}
client.c
#include<stdlib.h> #include<stdio.h> #include<string.h> #include<netdb.h> #include<sys/types.h> #include<netinet/in.h> #include<sys/socket.h> #include<unistd.h> #include<arpa/inet.h> #include<errno.h>int main(int argc,char *argv[])
{
int sockfd;
char sendbuffer[200];
char recvbuffer[200];
// char buffer[1024];
struct sockaddr_in server_addr;
struct hostent host;
int portnumber,nbytes;
if(argc!=3)
{
fprintf(stderr,"Usage :%s hostname portnumber\a\n",argv[0]);
exit(1);
}
if((host=gethostbyname(argv[1]))NULL)
{
herror("Get host name error\n");
exit(1);
}
if((portnumber=atoi(argv[2]))<0)
{
fprintf(stderr,"Usage:%s hostname portnumber\a\n",argv[0]);
exit(1);
}
if((sockfd=socket(AF_INET,SOCK_STREAM,0))-1)
{
fprintf(stderr,"Socket Error:%s\a\n",strerror(errno));
exit(1);
}
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family=AF_INET;
server_addr.sin_port=htons(portnumber);
server_addr.sin_addr=((struct in_addr *)host->h_addr);
if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))-1)
{
fprintf(stderr,"Connect error:%s\n",strerror(errno));
exit(1);
}
while(1)
{
printf("Please input your word:\n");
scanf("%s",sendbuffer);
printf("\n");
if(strcmp(sendbuffer,"quit")0)
break;
send(sockfd,sendbuffer,sizeof(sendbuffer),0);
recv(sockfd,recvbuffer,200,0);
printf("recv data of my world is :%s\n",recvbuffer);
}
// if((nbytes=read(sockfd,buffer,1024))==-1)
//{
// fprintf(stderr,"read error:%s\n",strerror(errno));
// exit(1);
// }
// buffer[nbytes]='\0';
// printf("I have received %s\n",buffer);
close(sockfd);
exit(0);
}
首先要编译tcpserver.c,命令：gcc -g tcpserver.c -o tcpserver
运行：./tcpserver 8080
然后再编译tcpclient.c，具体命令：gcc -g tcpclient.c -o tcpclient
运行：./tcpclient localhost 8080
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<div class="postDesc">posted @ <span id="post-date">2013-09-04 13:58</span> <a href="https://www.cnblogs.com/Adrian99/">星语160523</a> 阅读(<span id="post_view_count">5621</span>) 评论(<span id="post_comment_count">0</span>) <a href="https://i.cnblogs.com/EditArticles.aspx?postid=3300870" rel="nofollow">编辑</a> <a href="#" onclick="AddToWz(3300870);return false;">收藏</a></div>
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