linux网络设备测试-----socket

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本文介绍了一个简单的TCP客户端与服务器程序实现，通过代码示例展示了如何建立连接、发送和接收数据。客户端通过指定IP地址连接服务器，并发送消息；服务器监听特定端口，接收并响应客户端请求。

/*******************************
*     客户端程序 *
********************************/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>

int main(int argc,char *argv[])
{
   int sockfd,numbytes;
   char buf[100];
   struct hostent *he;
   struct sockaddr_in their_addr;
   //从输入的命令行的第2个参数获取服务器的IP地址
   he = gethostbyname(argv[1]);
   //客户端建立TCP协议的socket套接字描述符
   if((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1)
       {
       perror("socket");
       exit(1);
       }

   //客户端初始化结构体，连接到服务器的4321端口
   their_addr.sin_family = AF_INET;
   their_addr.sin_port = htons(4321);
   their_addr.sin_addr = *((struct in_addr *)he->h_addr);
   bzero(&(their_addr.sin_zero),8);

   //向服务器发起连接
   if(connect(sockfd,(struct sockaddr *)&their_addr,sizeof(struct sockaddr_in))==-1)
      {
       perror("connect");
       exit(1);
      }

   //向服务器发送字符串"hello!"
   if(send(sockfd,"Hello! I am Client.",100,0)==-1)
      {
       perror("send");
                exit(1);
      }

   //接收从服务器返回的信息
   if(recv(sockfd,buf,100,0)==-1)
      {
       perror("recv");
       exit(1);
      }

       printf("result: %s \n",buf);
        /*通信结束*/
       close(sockfd);
       return 0;

}

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

makefile:

EXTRA_LIBS += -lpthread
CC=gcc
EXEC = ./client
OBJS = client.o

all: $(EXEC)

$(EXEC): $(OBJS)
   $(CC) $(LDFLAGS) -o $@ $(OBJS) $(EXTRA_LIBS)

install:
   $(EXP_INSTALL) $(EXEC) $(INSTALL_DIR)

clean:
   -rm -f $(EXEC) *.elf *.gdb *.o

_____________________________________________________

/*******************************
*       server.c    *
********************************/
#include <sys/types.h>//socket
#include <sys/socket.h>//socket
#include <stdio.h>//printf
#include <stdlib.h>//exit
#include <errno.h>
#include <string.h>//bzero
//#include <unistd.h>
#include <netinet/in.h>//sockaddr_in

#define SERVER_PORT 4321

int main()
{
   int sockfd,new_fd;
   struct sockaddr_in my_addr;
   struct sockaddr_in their_addr;
   int sin_size;
        char buff[100];

   //服务器建立TCP协议的socket套接字描述符
   if((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1)
        {
       perror("socket");
       exit(1);
   }
      printf("socket success!,sockfd=%d\n",sockfd);

   //初始化sockaddr结构体，绑定4321端口
    my_addr.sin_family = AF_INET;
    my_addr.sin_port = htons(SERVER_PORT);
   my_addr.sin_addr.s_addr = INADDR_ANY;
   bzero(&(my_addr.sin_zero),8);

   //绑定套接字描述符sockfd
   if(bind(sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr_in))==-1)
      {
            perror("bind");
       exit(1);
   }
   printf("bind success!\n");

   //创建监听套接字描述符sockfd
   if(listen(sockfd,10)==-1)
   {
        perror("listen");
        exit(1);
   }
   printf("listening....\n");

   //服务器阻塞监听套接字，等待客户端程序连接
      while(1)
      {
       sin_size = sizeof(their_addr);

   // 如果创建连接，将产生一个全新的套接字
                if((new_fd = accept(sockfd,(struct sockaddr *)&their_addr,&sin_size))==-1)
           {
           perror("accept");
                  exit(1);
        }

       // bzero(buff, 100);
       //生成一个子进程来完成和客户端的会话，父进程继续监听
                if(!fork())
          {
       //读取客户端发来的信息
       if(recv(new_fd,buff,100,0)==-1)
               {
            perror("recv");
               exit(1);
            }
       printf(" %s\n",buff);
       //发送信息到客户端
       if(send(new_fd,"Welcome,This is Server.",50,0)==-1)
          perror("send");

       /*本次通信结束*/
        close(new_fd);
       exit(0);
   }
         /*下一个循环*/
}
    close(sockfd);
}

/*
root@1[server]# ./server
server is run: Success
Hello! Client connect.

root@2[client]# .client 192.168.1.99
result: Welcome,This is Server.
*/

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

makefile:

EXTRA_LIBS += -lpthread
CC = arm-poky-linux-gnueabi-gcc
EXEC = ./server
OBJS = server.o

all: $(EXEC)

$(EXEC): $(OBJS)
   $(CC) $(LDFLAGS) -o $@ $(OBJS) $(EXTRA_LIBS)

install:
   $(EXP_INSTALL) $(EXEC) $(INSTALL_DIR)

clean:
   -rm -f $(EXEC) *.elf *.gdb *.o