tcp套接口通信实验

实验二 tcp 套接口通信实验 一 实验目的 学会使用标准的 POSIX 套接口标准函数 满足客户端和服务器的通信需求 建立 tcp 套接口 接收与发送 tcp 数据包 解析与处理 tcp 数据包 二 预备知识 熟悉 tcp 套接口函数使用方法 三 实验预计时间 30 分钟左右 四 实验步骤 a 根据 unix 网络编程 书中的实例或者网上搜得的例子作为参考 编写 c 和 h 文件 分别编写服务器和客户端两端的代码 其中 由于是在一台 机器上开发 因此客户端的代码访问服务器的地址定为 127 0 0 1 即可 b 看懂例子 makefile c 编译 运行 五 实验源代码及结果 服务端程序TCPServer c include include include include include include include include int main int argc char argv int sockfd new fd 监听 socket sock fd 数据传输 socket new fd struct sockaddr in my addr 本机地址信息 struct sockaddr in their addr 客户地址信息 unsigned int sin size myport lisnum if argv 1 myport atoi argv 1 else myport 6000 if argv 2 lisnum atoi argv 2 else lisnum 2 if sockfd socket PF INET SOCK STREAM 0 1 perror socket exit 1 my addr sin family PF INET my addr sin port htons myport my addr sin addr s addr INADDR ANY bzero if bind sockfd struct sockaddr exit 1 if listen sockfd lisnum 1 perror listen exit 1 while 1 sin size sizeof struct sockaddr in if new fd accept sockfd struct sockaddr continue printf server got connection from s n inet ntoa their addr sin addr if fork 子进程代码段 if send new fd Hello world n 14 0 1 perror send close new fd exit 0 close new fd 父进程不再需要该 socket waitpid 1 NULL WNOHANG 等待子进程结束 清除子进程所占用资源 客户端程序 TcpClient c include include include include include include include include define MAXDATASIZE 100 每次最大数据传输量 int main int argc char argv int sockfd numbytes char buf MAXDATASIZE struct hostent he struct sockaddr in their addr unsigned int myport if argv 2 myport atoi argv 2 else myport 6000 if argc 3 fprintf stderr usage s hostname port n argv 0 exit 1 if he gethostbyname argv 1 NULL herror gethostbyname exit 1 if sockfd socket PF INET SOCK STREAM 0 1 perror socket exit 1 their addr sin family PF INET their addr sin port htons myport their addr sin addr struct in addr he h addr bzero if connect sockfd struct sockaddr exit 1 if numbytes recv sockfd buf MAXDATASIZE 0 1 perror recv exit 1 buf numbytes 0 print